This adds a function to copy one boxed value to another. It is assumed
that the destination boxed value is totally initialised (so it won't
try to free any memory in it).
Reviewed-by: Robert Bragg <robert@linux.intel.com>
This wraps all of the calls to glUniform* in the GE() macro so that it
will detect GL errors in the right place.
Reviewed-by: Robert Bragg <robert@linux.intel.com>
The code for manipulating CoglBoxedValues is now separated from
cogl-program.c into its own file. That way when we add support for
setting uniform values on a CoglPipeline the code for storing the
values can be shared.
Reviewed-by: Robert Bragg <robert@linux.intel.com>
This adds some macros to iterate over all the bits set in an array of
flags. The macros are a bit awkward because it tries to avoid using a
callback pointer so that the code is inlined.
cogl_bitmask is now using these macros as well so that the logic can
be shared.
Reviewed-by: Robert Bragg <robert@linux.intel.com>
Previously cogl-flags was using an array of ints to store the
flags. There was a comment saying that it would be nice to use longs
but this is awkward because g_parse_debug_flags can only work in
ints. This is a silly reason not to use longs because we can just
parse multiple sets of flags per long. This patch therefore changes
cogl-flags to use longs and tweaks the debug key parsing code.
Reviewed-by: Robert Bragg <robert@linux.intel.com>
Instead of testing each bit when iterating a bitmask, we can use ffsl
to skip over unset bits in single instruction. That way it will scale
by the number of bits set, not the total number of bits.
ffsl is a non-standard function which glibc only provides by defining
GNUC_SOURCE. However if we are compiling with GCC we can avoid that
mess and just use the equivalent builtin. When not compiling for GCC
it will fall back to _cogl_util_ffs if the size of ints and longs are
the same (which is the case on i686). Otherwise it fallbacks to a slow
function implementation.
Reviewed-by: Robert Bragg <robert@linux.intel.com>
The boilerplate for defining a GType for CoglFixed lived in
cogl-util.c but this didn't seem to make much sense seeing as nothing
in the cogl-util.h header file relates to CoglFixed and there is
already a separate C file for CoglFixed code. This also removes some
redundant header includes from cogl-util.c
Reviewed-by: Robert Bragg <robert@linux.intel.com>
Instead of storing only 31 bits in the pointer for a CoglBitmask, it
now assumes it can store a whole unsigned long minus the one bit used
to mark whether it has been converted to a GArray or not. This works
on the assumption that we can cast an unsigned long to a pointer and
back without losing information which I think should be true for any
platforms that Cogl is interested in. This has the advantage that on
64-bit architectures we can store 63 bits before we have to resort to
using a GArray at no extra cost. The values in the GArray are now
stored as unsigned longs as well on the assumption that it is more
efficient to load and store data in chunks of longs rather than ints.
Reviewed-by: Robert Bragg <robert@linux.intel.com>
Cogl keeps a pointer to the last used onscreen framebuffer from the
context to implement the deprecated cogl_set_draw_buffer function
which can take COGL_WINDOW_BUFFER as the target to use the last
onscreen buffer. Previously this would also take a reference to that
pointer. However that was causing a circular reference between the
framebuffer and the context which makes it impossible to clean up
resources properly when onscreen buffers are used. This patch instead
changes it to just store the pointer and then clear the pointer during
_cogl_onscreen_free as a kind of cheap weak reference.
Reviewed-by: Robert Bragg <robert@linux.intel.com>
This adds two new experimental public functions to replace the old
internal _cogl_pipeline_set_cull_face_state function:
void
cogl_pipeline_set_cull_face_mode (CoglPipeline *pipeline,
CoglPipelineCullFaceMode cull_face_mode);
void
cogl_pipeline_set_front_face_winding (CoglPipeline *pipeline,
CoglWinding front_winding);
There are also the corresponding getters.
https://bugzilla.gnome.org/show_bug.cgi?id=663628
Reviewed-by: Robert Bragg <robert@linux.intel.com>
cogl-utils.h needs to include cogl-defines.h so that it knows whether
COGL_HAS_GLIB_SUPPORT is defined.
https://bugzilla.gnome.org/show_bug.cgi?id=663578
Reviewed-by: Robert Bragg <robert@linux.intel.com>
Reviewed-by: Emmanuele Bassi <ebassi@linux.intel.com>
This patch moves the call to _cogl_destroy_texture_units() from
_cogl_context_free() to later on. When destroying a GL texture the
texture units are checked. This would end up accessing invalid memory
so we need to try to destroy the texture units only after everything
that might be referencing a texture has been destroyed.
Reviewed-by: Robert Bragg <robert@linux.intel.com>
Although there was a comment in cogl_texture_2d_copy_from_framebuffer
explaining that we shouldn't flush the clip state, the comment was a bit
miss-leading implying we were going to explicitly set a NULL clip. Also
we weren't actually avoiding flushing the clip state since we were
passing 0 for the CoglDrawFlags.
We now pass COGL_FRAMEBUFFER_FLUSH_SKIP_CLIP_STATE in to the flags when
flushing the framebuffer state and the comment has be updated to explain
that clipping won't affect reading from the framebuffer so we don't need
to flush it.
Reviewed-by: Neil Roberts <neil@linux.intel.com>
This api is deprecated and documented to be a NOP which wasn't actually
true. This patch actually updates the function to be a NOP. Its nice
that this gets rid of a point where we flush framebuffer state because
we are looking to add a new VirtualFramebuffer interface which will need
special consideration at each of the points we flush framebuffer state.
It was a mistake that this API was ever published, we don't believe
anyone is using the api but until we break api we have to keep the
symbol. The documented semantics are vague enough that a NOP is ok since
we never explicitly documented how the state would be flushed to GL so
there would be no way to reliably use that state anyway.
Reviewed-by: Neil Roberts <neil@linux.intel.com>
This change is one logical update to update the Wayland support. This
comprises of the following parts:
* Binding to both the shell and compositor global objects - necessary since
the API for setting top level status moved to the wl_shell interface
* The Wayland visual API went away and instead you setup the EGL surface
appropriately
* The message handling was refined to reflect the current behaviour - now
obsolete comments were removed and new comments updated
Reviewed-by: Robert Bragg <robert@linux.intel.com>
There was a comment implying that if a rgba config has been requested
but no suitable config was found then we would automatically fall back
to an rgb config instead. Actually if no rgba visual is found we simply
fail without any automatic fall back because Cogl is not in a good
position to judge if automatic fall backs are acceptable for higher
level apis such as clutter.
Reviewed-by: Neil Roberts <neil@linux.intel.com>
On GLES2, we need to specify an array size for the texture coord
varying array. Previously this size would be decided in one of the
following ways:
- For generated vertex shaders it is always the number of layers in
the pipeline.
- For generated fragment shaders it is the highest sampled texture
unit in the pipeline or the number of attributes supplied by the
primitive, whichever is higher.
- For user shaders it is usually the number of attributes supplied by
the primitive. However, if the application tries to compile the
shader and query the result before using it, it will always be at
least 4.
These shaders can quite easily end up with different values for the
declaration which makes it fail to link. This patch changes it so that
all of the shaders are generated with the maximum of the number of
texture attributes supplied by the primitive and the number of layers
in the pipeline. If this value changes then the shaders are
regenerated, including user shaders. That way all of the shaders will
always have the same value.
https://bugzilla.gnome.org/show_bug.cgi?id=662184
Reviewed-by: Robert Bragg <robert@linux.intel.com>
This documents that cogl_texture_get_rowstride() is deprecated (or
rather it was a mistake that the api was ever published) and also
clarifies the rowstride argument documentation for
cogl_texture_get_data() to explain how it's automatically calculated
when 0 is passed to help avoid misleading people into thinking that
cogl_texture_get_rowstride() is an appropriate way to get a valid
rowstride for that.
Reviewed-by: Neil Roberts <neil@linux.intel.com>
Xlib headers define many trivially named objects which can later cause
name collision problems when only cogl.h header is included in a program
or library. Xlib headers are now only included through including the
standalone header cogl-xlib.h.
https://bugzilla.gnome.org/show_bug.cgi?id=661174
Reviewed-by: Robert Bragg <robert@linux.intel.com>
Instead of emulating _CLAMP_TO_EDGE in cogl-primitives.c we now defer to
cogl_meta_texture_foreach_in_region() to support _CLAMP_TO_EDGE for us.
Reviewed-by: Neil Roberts <neil@linux.intel.com>
cogl_meta_texture_foreach_in_region() now directly supports
CLAMP_TO_EDGE wrap modes. This means the cogl_rectangle code will be
able to build on this and makes the logic accessible to anyone
developing custom primitives that need to support meta textures.
Reviewed-by: Neil Roberts <neil@linux.intel.com>
When associating indices with a CoglPrimitive you are now forced to
specify the number of indices that should be read when drawing.
It's easy to forget to call cogl_primitive_set_n_vertices() after
associating indices with a primitive (and anyway you can see that someone
could be led to believe Cogl can determine that implicitly somewhow) so
this should avoid a lot of mistakes with using the API.
We'd expect that setting indices and updating the n_vertices property
would go hand in hand 99% of the time anyway so this change should
be more convenient as well as less error prone.
This patch adds some documentation for cogl_primitive_set_indices and
cogl_primitive_get/set_n_vertices. It also tries to clarify how the
CoglPrimitive:n_vertices property is updated and what that property
means in relation to other functions too.
https://bugzilla.gnome.org/show_bug.cgi?id=661019
Reviewed-by: Neil Roberts <neil@linux.intel.com>
if a normalize factor of 1 is passed then we don't need to normalize the
starting point to find the closest point equivalent to 0.
Reviewed-by: Neil Roberts <neil@linux.intel.com>
This exposes cogl_sub_texture_new() and cogl_is_sub_texture() as
experimental public API. Previously sub-textures were only exposed via
cogl_texture_new_from_sub_texture() so there wasn't a corresponding
CoglSubTexture type. A CoglSubTexture is a high-level texture defined as
a sub-region of some other parent texture. CoglSubTextures are high
level textures that implement the CoglMetaTexture interface which can
be used to manually handle texture repeating.
Reviewed-by: Neil Roberts <neil@linux.intel.com>
It's useful to be able to query back the number of
point_samples_per_pixel that may have previously be chosen using
cogl_framebuffer_set_samples_per_pixel().
Reviewed-by: Neil Roberts <neil@linux.intel.com>
This exposes CoglTextureRectangle in the experimental cogl 2.0 api. For
now we just expose a single constructor;
cogl_texture_rectangle_new_with_size() but we can add more later.
This is part of going work to improve our texture apis with more
emphasis on providing low-level access to the varying semantics of
different texture types understood by the gpu instead of only trying to
present a lowest common denominator api.
CoglTextureRectangle is notably useful for never being restricted to
power of two sizes and for being sampled with non-normalized texture
coordinates which can be convenient for use a lookup tables in glsl due
to not needing separate uniforms for mapping normalized coordinates to
texels. Unlike CoglTexture2D though rectangle textures can't have a
mipmap and they only support the _CLAMP_TO_EDGE wrap mode.
Applications wanting to use CoglTextureRectangle should first check
cogl_has_feature (COGL_FEATURE_ID_TEXTURE_RECTANGLE).
Reviewed-by: Neil Roberts <neil@linux.intel.com>
Since we've had several developers from admirable projects say they
would like to use Cogl but would really prefer not to pull in
gobject,gmodule and glib as extra dependencies we are investigating if
we can get to the point where glib is only an optional dependency.
Actually we feel like we only make minimal use of glib anyway, so it may
well be quite straightforward to achieve this.
This adds a --disable-glib configure option that can be used to disable
features that depend on glib.
Actually --disable-glib doesn't strictly disable glib at this point
because it's more helpful if cogl continues to build as we make
incremental progress towards this.
The first use of glib that this patch tackles is the use of
g_return_val_if_fail and g_return_if_fail which have been replaced with
equivalent _COGL_RETURN_VAL_IF_FAIL and _COGL_RETURN_IF_FAIL macros.
Reviewed-by: Neil Roberts <neil@linux.intel.com>
when printing a matrix we aim to print out the matrix type but we
weren't checking the flags first to see if the type is valid. We now
check for the DIRTY_TYPE flag and if not set we also validate the matrix
type isn't out of range.
Reviewed-by: Neil Roberts <neil@linux.intel.com>
In cogl_matrix_look_at we have a tmp CoglMatrix allocated on the stack
but we weren't initializing its flags before passing it to
cogl_matrix_translate which meant if we were using COGL_DEBUG=matrices
we would end up trying to print out an invalid matrix type resulting in
a crash when overrunning an array of type names.
Reviewed-by: Neil Roberts <neil@linux.intel.com>
This factors out the CoglOnscreen code from cogl-framebuffer.c so we now
have cogl-onscreen.c, cogl-onscreen.h and cogl-onscreen-private.h.
Notably some of the functions pulled out are currently namespaced as
cogl_framebuffer but we know we are planning on renaming them to be in
the cogl_onscreen namespace; such as cogl_framebuffer_swap_buffers().
Reviewed-by: Neil Roberts <neil@linux.intel.com>
This adds COGL_PIPELINE_WRAP_MODE_MIRRORED_REPEAT enum so that mirrored
texture repeating can be used. This also adds support for emulating the
MIRRORED_REPEAT mode via the cogl-spans API so it can also be used with
meta textures such as sliced and atlas textures.
Reviewed-by: Neil Roberts <neil@linux.intel.com>
CoglMetaTexture is an interface for dealing with high level textures
that may be comprised of one or more low-level textures internally. The
interface allows the development of primitive drawing APIs that can draw
with high-level textures (such as atlas textures) even though the
GPU doesn't natively understand these texture types.
There is currently just one function that's part of this interface:
cogl_meta_texture_foreach_in_region() which allows an application to
resolve the internal, low-level textures of a high-level texture.
cogl_rectangle() uses this API for example so that it can easily emulate
the _REPEAT wrap mode for textures that the hardware can't natively
handle repeating of.
Reviewed-by: Neil Roberts <neil@linux.intel.com>
Instead of using integers to represent spans we now use floats instead.
This means we are no longer forced to iterate using non-normalized
coordinates so we should hopefully be able to avoid numerous redundant
unnormalize/normalize steps when using the spans api.
Reviewed-by: Neil Roberts <neil@linux.intel.com>
Since we can assume that all slices are CoglTexture2D textures we don't
need to chain on our implementation of _foreach_sub_texture_in_region
by calling _cogl_texture_foreach_sub_texture_in_region() for each slice.
We now simply determine the normalized virtual coordinates for the
current span inline and call the given callback inline too.
Reviewed-by: Neil Roberts <neil@linux.intel.com>
Currently features are represented as bits in a 32bit mask so we
obviously can't have more than 32 features with that approach. The new
approach is to use the COGL_FLAGS_ macros which lets us handle bitmasks
without a size limit and we change the public api to accept individual
feature enums instead of a mask. This way there is no limit on the
number of features we can add to Cogl.
Instead of using cogl_features_available() there is a new
cogl_has_feature() function and for checking multiple features there is
cogl_has_features() which takes a zero terminated vararg list of
features.
In addition to being able to check for individual features this also
adds a way to query all the features currently available via
cogl_foreach_feature() which will call a callback for each feature.
Since the new functions take an explicit context pointer there is also
no longer any ambiguity over when users can first start to query
features.
Reviewed-by: Neil Roberts <neil@linux.intel.com>
Cogl provides a consistent public interface regardless of whether the
underlying GL driver supports VBOs so it doesn't make much sense to have
this feature as part of the public api. We can't break the api by
removing the enum but at least we no longer ever set the feature flag.
We now have a replacement private feature flag COGL_PRIVATE_FEATURE_VBOS
which cogl now checks for internally.
Reviewed-by: Neil Roberts <neil@linux.intel.com>
Cogl provides a consistent public interface regardless of whether the
underlying GL driver supports PBOs so it doesn't make much sense to have
this feature as part of the public api. We can't break the api by
removing the enum but at least we no longer ever set the feature flag.
We now have a replacement private feature flag COGL_PRIVATE_FEATURE_PBOS
which cogl now checks for internally.
Reviewed-by: Neil Roberts <neil@linux.intel.com>
Cogl doesn't currently expose public api for clip planes so it
doesn't make much sense to have this feature as part of the public api.
We can't break the api by removing the enum but at least we no longer
ever set the feature flag.
We now have a replacement private feature flag
COGL_PRIVATE_FEATURE_FOUR_CLIP_PLANES which cogl now checks for
internally.
Reviewed-by: Neil Roberts <neil@linux.intel.com>
Cogl doesn't expose public api for blitting between framebuffers so it
doesn't make much sense to have this feature as part of the public api
currently. We can't break the api by removing the enum but at least we
no longer ever set the feature flag.
We now have a replacement private feature flag
COGL_PRIVATE_FEATURE_OFFSCREEN_BLIT which cogl now checks for
internally.
Reviewed-by: Neil Roberts <neil@linux.intel.com>
Although we have to leave the COGL_FEATURE_STENCIL_BUFFER enum as part
of the public api we no longer ever set this feature flag.
Cogl doesn't currently expose the concept of a stencil buffer in the
public api (we only indirectly expose it via the clip stack api) so it
doesn't make much sense to have a stencil buffer feature flag.
We now have a COGL_PRIVATE_FEATURE_STENCIL_BUFFER flag instead which
we can check when we need to use the buffer for clipping.
Reviewed-by: Neil Roberts <neil@linux.intel.com>
Actual support for yuv textures isn't fully plumbed into Cogl currently
so the check for GL_MESA_ycbcr_texture is meaningless. For now we just
remove the check.
Reviewed-by: Neil Roberts <neil@linux.intel.com>
make sure to #include "cogl-texture-private.h" in cogl-pipeline-layer.c
otherwise the build fails on win32.
Reviewed-by: Neil Roberts <neil@linux.intel.com>
This fixes validate_first_layer_cb so that it update the override
pipeline not the user's original pipeline. It also makes the check
for when to override the wrap mode more robust by considering that
we might add more wrap modes in the future.
Reviewed-by: Neil Roberts <neil@linux.intel.com>
To save users of the api having to manually check if each iterated span
intersects the region of interest we now guarantee that any span
iterated implicitly intersects the region of interest.
Reviewed-by: Neil Roberts <neil@linux.intel.com>
This make the CoglTexture2DSliced type public and adds
cogl_texture_2d_sliced_new_with_size() as an experimental API that can
be used to construct a sliced texture without any initial data.
Reviewed-by: Neil Roberts <neil@linux.intel.com>
This adds a new experimental function, cogl_clip_push_primitive, that
allows you to push a CoglPrimitive onto the clip stack. The primitive
should describe a flat 2D shape and the geometry shouldn't include any
self intersections. When pushing a primitive you also need to tell
Cogl what the bounding box of that shape is (in shape local coordinates)
so that Cogl is able to efficiently update the required region of the
stencil buffer.
Reviewed-by: Neil Roberts <neil@linux.intel.com>
This adds an internal _cogl_primitive_draw API that takes CoglDrawFlags
like _cogl_draw_attributes does which allows us to draw a primitive but
skip things like flushing journals, flushing framebuffer state and avoid
validating the current pipeline. This allows us to draw primitives in
places that could otherwise cause recursion.
Reviewed-by: Neil Roberts <neil@linux.intel.com>
The code that adds the silhouette of a path to the stencil buffer was
living in cogl2-path.c which seemed out of place when the bulk of the
work really related more to how the stencil buffer is managed and
basically only one line (a call to _cogl_path_fill_nodes) really related
to the path code directly.
This moves the code into cogl-clip-stack.c alone with similar code
that can add rectangle masks to the stencil buffer.
Reviewed-by: Neil Roberts <neil@linux.intel.com>
If we are asked to fill a path using any sliced textures then we need
to fallback to adding a mask of the path to the stencil buffer
and then drawing a bounding rectangle with the source textures instead.
Previously we were sharing some of the clip-stack code for adding
the path mask to the stencil buffer and being careful to check
that the current clip stack has been flushed already. We then made
sure to dirty the clip stack to be sure the path mask would be cleared
from the stencil buffer later.
This patch aims to simplify how this fallback is dealt with by just
using the public clipping API instead of relying on more fiddly tricks
to modify the stencil buffer directly without conflicting with the clip
stack.
Reviewed-by: Neil Roberts <neil@linux.intel.com>
This adds a new experimental function, cogl_framebuffer_finish(), which
can be used to explicitly synchronize the CPU with the GPU. It's rare
that this level of explicit synchronization is desirable but for example
it can be useful during performance analysys to make sure measurements
reflect the working time of the GPU not just the time to queue commands.
Reviewed-by: Neil Roberts <neil@linux.intel.com>
This adds support for multisample rendering to offscreen framebuffers.
After an offscreen framebuffer is first instantiated using
cogl_offscreen_new_to_texture() it is then possible to use
cogl_framebuffer_set_samples_per_pixel() to request multisampling before
the framebuffer is allocated. This also adds
cogl_framebuffer_resolve_samples() for explicitly resolving point
samples into pixels. Even though we currently only support the
IMG_multisampled_render_to_texture extension which doesn't require an
explicit resolve, the plan is to also support the
EXT_framebuffer_multisample extension which uses the framebuffer_blit
extension to issue an explicit resolve.
Reviewed-by: Neil Roberts <neil@linux.intel.com>
This adds support for multisample based rendering of onscreen windows
whereby multiple point samples per pixel can be requested and if the
hardware supports that it results in reduced aliasing (especially
considering the jagged edges of polygons)
Reviewed-by: Neil Roberts <neil@linux.intel.com>
When creating new onscreen framebuffers we need to take the
configuration in cogl terms and translate that into a configuration
applicable to any given winsys, e.g. an EGLConfig or a GLXFBConfig
or a PIXELFORMATDESCRIPTOR.
Also when we first create a context we typically have to do a very
similar thing because most OpenGL winsys APIs also associate a
framebuffer config with the context and all future configs need to be
compatible with that.
This patch introduces an internal CoglFramebufferConfig to wrap up some
of the configuration parameters that are common to CoglOnscreenTemplate
and to CoglFramebuffer so we aim to re-use code when dealing with the
above two problems.
This patch also aims to rework the winsys code so it can be more
naturally extended as we start adding more configureability to how
onscreen framebuffers are created.
Reviewed-by: Neil Roberts <neil@linux.intel.com>
This adds cogl_framebuffer_discard_buffers API that allows applications
to explicitly discard depth and stencil buffers which really helps when
using a tile based GPU architexture by potentially avoiding the need to
save the results of depth and stencil buffer changes to system memory
between frames since these can usually be handled directly with on-chip
memory instead.
The semantics for cogl_framebuffer_swap_buffers and
cogl_framebuffer_swap_region are now documented to include an implicit
discard of all buffers, including the color buffer.
We now recommend that all rendering to a CoglOffscreen framebuffer
should be followed by a call like:
cogl_framebuffer_discard_buffers (fb,
COGL_BUFFER_BIT_DEPTH|
COGL_BUFFER_BIT_STENCIL);
Reviewed-by: Neil Roberts <neil@linux.intel.com>
Both the GLSL and the ARBfp pipeline backends were using a variable
called last_used_for_pipeline to keep track of the last pipeline that
the shader or program state was used for. If this address is the same
as last time when the pipeline state is flushed then Cogl will only
flush the uniforms that have been modified, otherwise it will flush
all of them. The problem with this is that there was nothing to keep
that address alive so it could be destroyed and reused for a different
pipeline by the time the shader state is reused. This is quite likely
to happen in an application using legacy state because in that case
the shader state will always be used with a one-shot pipeline that
will likely be recycled in the next frame.
There is already a destroy callback to unref the shader state when the
pipeline is destroyed so this patch just makes that callback also
clear the last_used_for_pipeline pointer if it matches the pipeline
being destroyed.
https://bugzilla.gnome.org/show_bug.cgi?id=662542
Reviewed-by: Robert Bragg <robert@linux.intel.com>
This adds a description of the replacement Cogl names for the GLSL
builtins. It also updates some of the deprecation tags and corrects
some misinformation.
Reviewed-by: Robert Bragg <robert@linux.intel.com>
Previously the EGL backend was directly prodding the width/height
members of the framebuffer structure when a configure notify event is
received. However this doesn't set the dirty flag for the viewport so
Cogl will continue using the wrong viewport y offset. The GLX backend
is already using an abstraction for updating the size which does set
the flag. This patch just makes the EGL backend also use that
abstraction.
When freeing a pipeline in _cogl_pipeline_free we weren't making sure to
free the layers_cache which was leading to a memory leak.
Thanks to Sunjin Yang for finding this.
https://bugzilla.gnome.org/show_bug.cgi?id=660986
Reviewed-by: Neil Roberts <neil@linux.intel.com>
If we failed to create a native texture from pixmap via EGL or GLX then
we shouldn't call the winsys's texture_pixmap_x11_damage_notify
function. By doing the validation in cogl-texture-pixmap-x11.c the
winsys code can continue to assume that it doesn't need to verify there
is a valid tex_pixmap->winsys pointer.
Thanks to Damien Leone <dleone@nvidia.com> for catching this issue.
https://bugzilla.gnome.org/show_bug.cgi?id=660184
The previous detection was based on color depth only to determine the
texture format to use in GLX. If that worked fine at depths 24 (RGB8)
and 32 (ARGB8), that would fail at depth 30 (BGR10) and fallback to
software instead of using the TFP extension.
This commit uses an efficient population count implementation to
compare the number of 1-bits in color masks against the color depth
requested by the X client. If they are not equal this means that an
alpha channel has been requested.
Reviewed-by: Robert Bragg <robert@linux.intel.com>
G_DISABLE_DEPRECATED is only intended for developers of Cogl and it
sometimes breaks the build for people just trying to build a
release. This patch adds an option to enable deprecated Glib
features. By default it is enabled for non-git versions of Cogl.
The patch is based on similar code in Clutter except it adds the flags
to COGL_EXTRA_CFLAGS instead of having a separate variable.
Reviewed-by: Robert Bragg <robert@linux.intel.com>
It seems that cogl-context-private.h needs to be included before including
any of the pipeline-related stuff to avoid build errors on C89 compilers.
This is due to the recent cogl-pipeline decoupling, seems like.
Reviewed-by: Robert Bragg <robert@linux.intel.com>
During arbfp codegen we weren't checking for NULL textures and so we
would crash when trying to query a NULL texture's GL texture target.
Since NULL texture targets result in ctx->default_gl_texture_2d_tex
being bound we can assume that a NULL texture corresponds to a
GL_TEXTURE_2D target.
Reviewed-by: Neil Roberts <neil@linux.intel.com>
This optimizes the layer and pipeline _compare_differences functions so
neither of them use the GArray api since building up the list of
ancestors by appending to a shared GArray was showing quite high on
profiles due to how frequently pipeline comparisons are made. Instead
we now build up a transient, singly linked list by allocating GList
nodes via alloca to build up the parallel lists of ancestors.
This tweaked approach actually ends up being a bit more concise than
before, we avoid the overhead of the GArray api and now avoid making any
function calls while comparing (assuming the _get_parent() calls always
inline), we avoiding needing to get the default cogl context.
Reviewed-by: Neil Roberts <neil@linux.intel.com>
We only need a ctx pointer if we need to refer to the default_layer_x
layers to copy as templates so only call _cogl_context_get_default()
once we need to copy a template. _cogl_context_get_default() was
starting to show up in profiles and this was the main cause.
Reviewed-by: Neil Roberts <neil@linux.intel.com>
This splits out the core CoglPipelineLayer support code from
cogl-pipeline.c into cogl-pipeline-layer.c; it splits out the debugging
code for dumping a pipeline to a .dot file into cogl-pipeline-debug.c
and it splits the CoglPipelineNode support which is shared between
CoglPipeline and CoglPipelineLayer into cogl-node.c.
Note: cogl-pipeline-layer.c only contains the layer code directly
relating to CoglPipelineLayer objects; it does not contain any
_cogl_pipeline API relating to how CoglPipeline tracks and manipulates
layers.
This avoids using sscanf to determine the texture_unit that a
tex_coord%d_in attribute name corresponds to since that was showing high
on profiles. Instead once we know we have a "tex_coord" name then we
can simply use strtoul which is much cheaper and use the returned endptr
we get to verify we have a "_in" suffix after the number.
Reviewed-by: Neil Roberts <neil@linux.intel.com>
We've started seeing cases where we want to allocate lots of one-shot
primitives per-frame and the cost of allocating primitives becomes
important in this case since it can start being noticeable in profiles.
The main cost for allocating primitives was the GArray allocation
and appending the attributes to the array. This updates the code to
simply over allocate the primitive storage so we can embed the list
of attributes directly in that allocation.
If the user later sets new attributes and there isn't enough embedded
space then a separate slice allocation for the new attributes is made
but still this should be far less costly than using a GArray as before.
Most of the time we would expect when setting new attributes there will
still be the same number of attributes, so the embedded space can simple
be reused.
Reviewed-by: Neil Roberts <neil@linux.intel.com>
Calling g_strdup for attribute names was starting to show up in profiles
due to calling malloc for new string storage so frequently. This avoids
calling g_strdup and calls g_intern_string() instead. For the really
common case names we even avoid the cost of g_intern_string since we
can trivially relate our internal name_id to a static string.
Reviewed-by: Neil Roberts <neil@linux.intel.com>
As part of the on going, incremental effort to purge the non type safe
CoglHandle type from the Cogl API this patch tackles most of the
CoglHandle uses relating to textures.
We'd postponed making this change for quite a while because we wanted to
have a clearer understanding of how we wanted to evolve the texture APIs
towards Cogl 2.0 before exposing type safety here which would be
difficult to change later since it would imply breaking APIs.
The basic idea that we are steering towards now is that CoglTexture
can be considered to be the most primitive interface we have for any
object representing a texture. The texture interface would provide
roughly these methods:
cogl_texture_get_width
cogl_texture_get_height
cogl_texture_can_repeat
cogl_texture_can_mipmap
cogl_texture_generate_mipmap;
cogl_texture_get_format
cogl_texture_set_region
cogl_texture_get_region
Besides the texture interface we will then start to expose types
corresponding to specific texture types: CoglTexture2D,
CoglTexture3D, CoglTexture2DSliced, CoglSubTexture, CoglAtlasTexture and
CoglTexturePixmapX11.
We will then also expose an interface for the high-level texture types
we have (such as CoglTexture2DSlice, CoglSubTexture and
CoglAtlasTexture) called CoglMetaTexture. CoglMetaTexture is an
additional interface that lets you iterate a virtual region of a meta
texture and get mappings of primitive textures to sub-regions of that
virtual region. Internally we already have this kind of abstraction for
dealing with sliced texture, sub-textures and atlas textures in a
consistent way, so this will just make that abstraction public. The aim
here is to clarify that there is a difference between primitive textures
(CoglTexture2D/3D) and some of the other high-level textures, and also
enable developers to implement primitives that can support meta textures
since they can only be used with the cogl_rectangle API currently.
The thing that's not so clean-cut with this are the texture constructors
we have currently; such as cogl_texture_new_from_file which no longer
make sense when CoglTexture is considered to be an interface. These
will basically just become convenient factory functions and it's just a
bit unusual that they are within the cogl_texture namespace. It's worth
noting here that all the texture type APIs will also have their own type
specific constructors so these functions will only be used for the
convenience of being able to create a texture without really wanting to
know the details of what type of texture you need. Longer term for 2.0
we may come up with replacement names for these factory functions or the
other thing we are considering is designing some asynchronous factory
functions instead since it's so often detrimental to application
performance to be blocked waiting for a texture to be uploaded to the
GPU.
Reviewed-by: Neil Roberts <neil@linux.intel.com>
cogl_rectangle has some validation code to check whether the first
layer has a sliced texture. If so it will abandon the rest of the
layers and print a warning. However it was even doing this pruning and
displaying the warning if there is only one layer. This patch just
makes it check whether the pipeline actually has more than one layer
before pruning or displaying the warning but it will still fallback to
the multiple quads path.
Reviewed-by: Robert Bragg <robert@linux.intel.com>
This adds an internal function to set the backface culling state on a
pipeline. This includes properties to set the culling mode (front,
back or both) and also to set which face is considered the front
(COGL_WINDING_CLOCKWISE or COGL_WINDING_COUNTER_CLOCKWISE). The actual
front face flushed to GL depends on whether we are rendering to an
offscreen buffer or not. This means that when changing between on- and
off- screen framebuffers it now checks whether the last flushed
pipeline has backface culling enabled and forces a reflush of the cull
face state if so.
The backface culling is now set on a pipeline as part of the legacy
state. This is important because some code in Cogl assumes it can
flush a temporary pipeline to revert to a known state, but previously
this wouldn't disable backface culling so things such as flushing the
clip stack could get confused.
Reviewed-by: Robert Bragg <robert@linux.intel.com>
When changing between two framebuffers that have different color masks
it now forces the pipeline to flush the mask by setting
current_pipeline_changes_since_flush. For this to work there needs to
be a common bit of code that gets called when the framebuffers are
changed that has access to both the old framebuffer and the new
framebuffer. _cogl_set_framebuffers_real can't be used for this
because when it is called from cogl_pop_framebuffer the stack entries
have already changed so it can't know the old framebuffer. This patch
adds a new function called notify_buffers_changed which should get
called whenever the buffers are changed and it explicitly gets passed
pointers to the old and new buffers. cogl_pop_framebuffer now calls
this instead of trying to use _cogl_set_framebuffers_real to force a
flush.
This patch also fixes the ctx->window_buffer pointer. Previously this
was implemented by searching in the framebuffer stack for an onscreen
framebuffer whenever the current buffers are changed. However it does
this after the stack has already changed so it won't usually find the
right buffer.
Reviewed-by: Robert Bragg <robert@linux.intel.com>
The ARBfp backend can't handle fog so it tries to check for when it's
enabled and bails out. However it was checking using the global legacy
state value on the CoglContext but this doesn't necessarily reflect
the state that will actually be used by the pipeline because Cogl may
have internally pushed a different pipeline.
This patch adds an internal _cogl_pipeline_get_fog_enabled which the
ARBfp backend now uses.
Reviewed-by: Robert Bragg <robert@linux.intel.com>
Some code in Cogl such as when flushing a stencil clip assumes that it
can push a temporary simple pipeline to reset to a known state for
internal drawing operations. However this breaks down if the
application has set any legacy state because that is set globally so
it will also get applied to the internal pipeline.
_cogl_draw_attributes already had an internal flag to disable applying
the legacy state but I think this is quite awkward to use because not
all places that push a pipeline draw the attribute buffers directly so
it is difficult to pass the flag down through the layers.
Conceptually the legacy state is meant to be like a layer on top of
the purely pipeline-based state API so I think ideally we should have
an internal function to push the source without the applying the
legacy state. The legacy state can't be applied as the pipeline is
pushed because the global state can be modified even after it is
pushed. This patch adds a _cogl_push_source() function which takes an
extra boolean flag to mark whether to enable the legacy state. The
value of this flag is stored alongside the pipeline in the pipeline
stack. Another new internal function called
_cogl_get_enable_legacy_state queries whether the top entry in the
pipeline stack has legacy state enabled. cogl-primitives and the
vertex array drawing code now use this to determine whether to apply
the legacy state when drawing. The COGL_DRAW_SKIP_LEGACY_STATE flag is
now removed.
Reviewed-by: Robert Bragg <robert@linux.intel.com>
Since 12b3d21aaa cogl is using the vertex attribute API to stroke a
path. However it was still manually appllying the legacy state to the
pipeline. cogl_vdraw_attributes also applies the legacy state so it
ends up getting applied twice. This patch just removes it from
_cogl_path_stroke_nodes.
Reviewed-by: Robert Bragg <robert@linux.intel.com>
This patch basically restores the logic from 1.6. There we assumed that
glXCopySubBuffer won't tear and thus only needs to be throttled to the
framerate, while glBlitFramebuffer needs to always wait to avoid
tearing.
With Nvidia drivers specifically we have seen that glBlitFramebuffer is
not synchronized. Eventually the plan is that Cogl will actually take
into consideration the underlying driver/hw vendor and driver version
and we may want to only mark glBlitFramebuffer un-synchronized on
Nvidia.
https://bugzilla.gnome.org/show_bug.cgi?id=659360
Reviewed-by: Robert Bragg <robert@linux.intel.com>
All of the cogl_pipeline API is currently experimental so this makes
sure the API is surrounded by #ifdef COGL_ENABLE_EXPERIMENTAL_API
guards and all the symbols have a #define to give them an _EXP suffix as
we do for other experimental API.
Reviewed-by: Neil Roberts <neil@linux.intel.com>
As part of an on-going effort to get cogl-pipeline.c into a more
maintainable state this splits out all the apis relating just to
layer state. This just leaves code relating to the core CoglPipeline
and CoglPipelineLayer design left in cogl-pipeline.c.
This splits out around 2k more lines from cogl-pipeline.c although we
are still left with nearly 4k lines so we still have some way to go!
Reviewed-by: Neil Roberts <neil@linux.intel.com>
Since cogl-pipeline.c has become very unwieldy this make a start at
trying to shape this code back into a manageable state. This patche
moves all the API relating to core pipeline state into
cogl-pipeline-state.c. This doesn't move code relating to layer state
out nor does it move any of the code supporting the core design
of CoglPipeline itself.
This change alone factors out 2k lines of code from cogl-pipeline.c
which is obviously a good start. The next step will be to factor
out the layer state and then probably look at breaking all of this
state code down into state-groups.
Reviewed-by: Neil Roberts <neil@linux.intel.com>
dgettext (which Cogl is using) doesn't work unless you first tell
gettext where the locale dir is for the library's domain. This just
adds the necessary calls into _cogl_init.
https://bugzilla.gnome.org/show_bug.cgi?id=658700
Reviewed-by: Robert Bragg <robert@linux.intel.com>
When the clip contains two rectangles which do not intersect it was
generating a clip bounds where the bottom-right corner was above or to
the left of the top-left corner. This would end up allowing the pixels
between the two rectangles instead of clipping everything like it
should. To fix this there is now an extra check which detects this
situation and just clears the clip bounds to all zeroes in a similar
way to what cogl-clip-stack does.
https://bugzilla.gnome.org/show_bug.cgi?id=659029
Reviewed-by: Robert Bragg <robert@linux.intel.com>
Commit 12b3d21a changed cogl-path so that it will use the vertex
attribute API to stroke the path in a similar way to how it was using
the API to fill the path. However it wasn't clearing the stroke buffer
when the path is modified so it would continue to use the unmodified
stroke.
Reviewed-by: Robert Bragg <robert@linux.intel.com>
Instead of adding -DCOGL_ENABLE_EXPERIMENTAL_2_0_API to the
cogl-2.0-experimental.pc file we now install a cogl2-experimental.h
that #defines COGL_ENABLE_EXPERIMENTAL_2_0_API before including
cogl.h.
The problem with having the define in the .pc file is that you might
develop a library that depends on the experimental 2.0 api internally
and then you might want to use that library with Clutter which still
uses the 1.0 API but the .pc file for your library will indirectly,
automatically enable the 2.0 api which can cause conflicts.
When we are about to start arbfp codegen we call shader_state_new() to
allocate new state structures used to build up the code and that
function makes sure to zero the newly allocated structures.
Right after calling shader_state_new() we were then also explicitly
iterating though the newly allocated unit_state structures and zeroing
the .sampled and .dirty_combine_constant members as well as resetting
shader_state->next_constant_id = 0. This patch removes that redundant
re-initialization of state.
Reviewed-by: Neil Roberts <neil@linux.intel.com>
We weren't actually tracking which layers have been allocated param
space for combine constants; all layers just had a default constant_id
of 0 that indexes into the program.local[] params array and a dirty flag
to say when the constant needs updating. There are times though when we
say to update everything by-passing the dirty flag and because we
weren't actually tracking which layers needed constants we would always
write a constant to program.local[0] for every layer. The upshot was
that we could end up clobbering a real constant that was actually
allocated the constant_id = 0 slot.
This patch adds a new UnitState bitfield to track if the layer has a
corresponding constant that may need flushing and we only ever write the
constant with glProgramLocalParameter4fv if that's set.
https://bugzilla.gnome.org/show_bug.cgi?id=658092
Reviewed-by: Neil Roberts <neil@linux.intel.com>
This makes a start on porting the Cogl conformance tests that currently
still live in the Clutter repository to be standalone Cogl tests that no
longer require a ClutterStage.
The main thing is that this commit brings in is the basic testing
infrastructure we need, so now we can port more and more tests
incrementally.
Since the test suite wants a way to synchronize X requests/replies and
we can't simply call XSynchronize in the test-utils code before we know
if we are really running on X this adds a check for an environment
variable named "COGL_X11_SYNC" in cogl-xlib-renderer.c and if it's set
it forces XSynchronize (dpy, TRUE) to be called.
By default the conformance tests are run off screen. This makes the
tests run much faster and they also don't interfere with other work you
may want to do by constantly stealing focus. CoglOnscreen framebuffers
obviously don't get tested this way so it's important that the tests
also get run on screen every once in a while, especially if changes are
being made to CoglFramebuffer related code. On screen testing can be
enabled by setting COGL_TEST_ONSCREEN=1 in your environment.
The line "#define cogl_display_get_rendrer cogl_display_get_rendrer_EXP"
should read
"#define cogl_display_get_renderer cogl_display_get_renderer_EXP"...
https://bugzilla.gnome.org/show_bug.cgi?id=658333
Reviewed-by: Emmanuele Bassi <ebassi@linux.intel.com>
This adds a new function, cogl_framebuffer_get_color_format() to be able
to query the common pixel format for any color buffers attached to a
given CoglFramebuffer. For example an offscreen framebuffer created
using cogl_offscreen_new_to_texture() would have a format matching the
texture.
Reviewed-by: Neil Roberts <neil@linux.intel.com>
If the user doesn't explicitly pass an onscreen template then instead of
leaving display->onscreen_template as NULL we now instantiate a template
ourselves. This simplifies winsys code that might want to refer to the
template since it needn't first check for a NULL pointer.
Reviewed-by: Neil Roberts <neil@linux.intel.com>
All our experimental Cogl symbols have a corresponding #define to add
"_EXP" to the end of the symbol name, but those defines are often
positioned right after the corresponding gtk-doc comment and before
the symbol definition which means the generated documentation ends up
refering to the define and not the real definition. This tidies up
cogl-texture-2d.h and moves all the defines to be be before the gtk-doc
comments.
Reviewed-by: Neil Roberts <neil@linux.intel.com>
Whenever a texture lookup is performed for a layer the result is now
stored in a variable and used repeatedly instead of generating the
code for the lookup every time it is accessed. This means for example
when using the INTERPOLATE function with a texture lookup for the
third parameter it will only generate one texture lookup instead of
two.
https://bugzilla.gnome.org/show_bug.cgi?id=656426
Reviewed-by: Robert Bragg <robert@linux.intel.com>
This patch changes it so that code for each layer is generated on
demand instead of directly in the add_layer implementation. The
pipeline only explicitly generates code for the last layer. If this
layer references the result from any other layers, these will also be
recursively generated. This means that if a layer is using 'REPLACE'
then it won't redundantly generate the code for the previous
layers.
The result for each layer is generated into a variable called layer%i
where %i is the layer index (not the unit index). Therefore to get the
result from layer n we just have to refer to the varible layern.
https://bugzilla.gnome.org/show_bug.cgi?id=656426
Reviewed-by: Robert Bragg <robert@linux.intel.com>
Instead of calling _cogl_texutre_prepare_for_upload in
cogl_texture_set_region_from_bitmap the call is now deferred to the
implementation of the virtual for set_region. This is needed if the
texture backend is using a different format for the actual GL texture
than what is reported by cogl_texture_get_format. This happens for
example with atlas textures which report the original internal format
specified when the texture was created but actually always store the
data in an RGBA texture.
Also when creating an atlas texture from a bitmap it was preparing the
bitmap to be uploaded to the original format instead of the format of
the actual texture used for the atlas. Then it was using
cogl_texture_set_region_from_bitmap to upload the 5 pieces to make the
copies of the edge pixels. This would end up converting the image to
the actual format 5 times. The atlas textures have now been changed to
prepare the bitmap for the right format.
https://bugzilla.gnome.org/show_bug.cgi?id=657840
Reviewed-by: Robert Bragg <robert@linux.intel.com>
for a blend string like:
"RGBA=ADD(SRC_COLOR, SRC_COLOR * (DST_COLOR[A]))"
it was awkward that we were requiring developers to explicitly put
redundant brackets around the DST_COLOR[A] blend factor. The parser has
been updated so now braces are only required for factors like
"(1-SRC_COLOR[A])"
Reviewed-by: Neil Roberts <neil@linux.intel.com>
Add a method on the renderer to know how many texture image units are
accessible from fragment shaders.
https://bugzilla.gnome.org/show_bug.cgi?id=657347
Reviewed-by: Robert Bragg <robert@linux.intel.com>
This function was not used in the opengl pipeline, probably because of
the more precise get_max_activable_texture_units().
Remove it then.
https://bugzilla.gnome.org/show_bug.cgi?id=657347
Reviewed-by: Robert Bragg <robert@linux.intel.com>
Similar to the widely used gluLookAt API, this adds a CoglMatrix utility
for setting up a view transform in terms of positioning a camera/eye
position that points to a given object position aligned to a given
world-up vector.
Reviewed-by: Neil Roberts <neil@linux.intel.com>
Cogl aims to consistently put the origin of 2D objects at the top-left
instead of the bottom left as OpenGL does, but there was an oversight
and the experimental cogl_framebuffer_swap_region API was accepting
coordinates relative to the bottom left. Cogl will now flip the user's
given rectangles to be relative to the bottom of the framebufffer before
sending them to APIs like glXCopySubBuffer and glBlitFramebuffer.
Reviewed-by: Neil Roberts <neil@linux.intel.com>
If the user doesn't explicitly allocate a CoglFramebuffer then Cogl
should automatically allocate the framebuffer when the user starts to
draw to the framebuffer. So this way calling cogl_framebuffer_allocate
is only required if you are explicitly interested in checking for and
gracefully handling failures to allocate a framebuffer. If automatic
allocation fails then application behaviour becomes undefined.
Reviewed-by: Neil Roberts <neil@linux.intel.com>
This makes cogl_framebuffer_clear and cogl_framebuffer_clear4f public as
experimental API. Since these functions take explicit framebuffer
pointers you don't need to push/pop a framebuffer just to clear it. Also
these functions are implicitly tied to a specific CoglContext via the
framebuffer pointer unlike cogl_clear.
Reviewed-by: Neil Roberts <neil@linux.intel.com>
Some of the functions we were calling in cogl_framebuffer_clear[4f] were
referring to the current framebuffer, which would result in a crash
if nothing had been pushed before trying to explicitly clear a given
framebuffer.
Reviewed-by: Neil Roberts <neil@linux.intel.com>
There is no need to call _cogl_framebuffer_init_bits for the draw and
read buffers each time we flush the framebuffer state since we will
always re-sync with gl if necessary when the
cogl_framebuffer_get_red/green/blue/alpha_bits functions are called.
Reviewed-by: Neil Roberts <neil@linux.intel.com>
This adds a function to query what CoglContext a given framebuffer
belongs too. This can be useful if you pass framebuffer pointers around
and at some point you want to create another framebuffer as part of the
same context as a given framebuffer without assuming there is a single
default context.
Reviewed-by: Neil Roberts <neil@linux.intel.com>
The CoglBuffer api is available as experimental 2.0 api but we forgot to
exposed the COGL_BUFFER casting macro.
Reviewed-by: Neil Roberts <neil@linux.intel.com>
Instead of creating typedefs like uint8, uint16 and uint32 we now use
the glib sized typedefs in stb_image to avoid conflict with the uint8,
uint16 and uint32 typedefs on android.
Reviewed-by: Neil Roberts <neil@linux.intel.com>
We shouldn't assume the GLchar is a valid typedef with all GL headers
when declaring all the symbols in cogl-ext-functions.h to lookup. GLchar
may not be avilable with gles1 for example so we were seeing build
failures. The patch simply replaces occurrences of GLchar with char.
Reviewed-by: Neil Roberts <neil@linux.intel.com>
When cogl initializes we now check for a cogl/cogl.conf in any of the
system config dirs (determined using $XDG_CONFIG_DIRS on linux) we then
also check the user's config directory (determined using XDG_CONFIG_HOME
on linux) for a cogl/cogl.conf file. Options specified in the user
config file have priority over the system config options.
The config file has an .ini style syntax with a mandatory [global]
section and we currently understand 3 keynames: COGL_DEBUG, COGL_DRIVER
and COGL_RENDERER which have the same semantics as the corresponding
environment variables.
Options set using the environment variables have priority over options
set in the config files. To allow users to undo the enabling of debug
options in config files this patch also adds a check for COGL_NO_DEBUG
environment variable which will disable the specified options which may
have been enabled in config files.
Reviewed-by: Neil Roberts <neil@linux.intel.com>
The parser couldn't cope with TEXTURE_N source arguments because the
sources are checked in turn to find one that matches the beginning of
the argument. The TEXTURE_N source was checked last so it would end up
matching the regular 'TEXTURE' source and then the parser would choke
when it tries to parse the trailing parts.
This patch just moves the check for TEXTURE_ to the top. It also also
changes it so that the argument only needs to be at least 8 characters
long instead of 9. This is necessary because the parser doesn't
consider the digits to be part of the name of the argument so while we
are parsing 'TEXTURE_0' the length is only 8.
Reviewed-by: Robert Bragg <robert@linux.intel.com>
Since the projection matrix isn't tracked in the journal and since our
software transform of vertices as we log into the journal doesn't
include the projective transform we need to make sure we flush all
primitives in the journal before ever changing the projection.
Reviewed-by: Neil Roberts <neil@linux.intel.com>
It's not necessary to generate cogl-display.h just for the GDL backend
and to change the inclusion of libgdl.h. We can just tweak the include
CFLAGS to put /usr/include/CE4100 in the search path when needed.
Previously this did not work because of a stay ',' at the end of the
COGL_EXTRA_CFLAGS int he configure.ac. This actually simplifies the
code, which is always good.
This also fixes out of tree builds.
https://bugzilla.gnome.org/show_bug.cgi?id=655724
Reviewed-by: Neil Roberts <neil@linux.intel.com>
cogl_polygon creates some temporary strings, CoglAttributeBuffers and
CoglAttributes but it was never freeing them.
Based on a patch by Florian Renaut
https://bugzilla.gnome.org/show_bug.cgi?id=655556
Reviewed-by: Robert Bragg <robert@linux.intel.com>
The documentation for wglGetProcAddress implies that it should only be
used for extension functions. The rest of Cogl assumes that it can
dynamically resolve all GL symbols so it would crash if this
happens. This patch makes it fallback to trying to resolve the symbol
using GModule to open the opengl32 library if wglGetProcAddress fails.
https://bugzilla.gnome.org/show_bug.cgi?id=655510
Reviewed-by: Robert Bragg <robert@linux.intel.com>
The check for the point sprite feature got lost when the feature
functions header was combined for GL and GLES in dae02a99a.
Reviewed-by: Robert Bragg <robert@linux.intel.com>
The cogl_framebuffer_get_blue_bits was defined 2 times-fix to use the
correct define for cogl_framebuffer_get_alpha_bits
Reviewed-by: Neil Roberts <neil@linux.intel.com>
If the display has been setup up, we should destroy the underlying
objects that the winsys has created. This can be done by calling the
winsys->destroy_display() function in _free.
Then, in that function, and for the NULL and GDL EGL platform we can
destroy the surface we have created in the setup_display() function
(through create_context()).
This allows to have clutter create a "dummy" display in
cogl_renderer_check_onscreen_template(), then free it, then recreate the
context and the surface that will be the final ones.
https://bugzilla.gnome.org/show_bug.cgi?id=655355
If we are being called without any GDL specific call (either the plane
we want to render to or the swap chain length) we can provide sane
defaults to still be able to create a context and a surface.
https://bugzilla.gnome.org/show_bug.cgi?id=655355
The egl winsys has a few code paths depending on the platform we are
compiling for. The GDL platform needs those defined as well.
A few tweaks were needed here and there to make it compile again.
https://bugzilla.gnome.org/show_bug.cgi?id=655355
We weren't defining CLUTTER_CEX100_LIBGDL_PREFIX in the configure.ac and
thus failing to compile when selecting the EGL/GDL winsys. Take the
opportunity to rename that to COGL_CEX100_LIBGDL_PREFIX
https://bugzilla.gnome.org/show_bug.cgi?id=655355
The GLX winsys is only compatible with GL drivers so we now bail out
from cogl-winsys-glx.c:_cogl_winsys_renderer_connect if a GLES driver
has been chosen.
Reviewed-by: Neil Roberts <neil@linux.intel.com>
When passing the EGL_NATIVE_PIXMAP_KHR target to eglCreateImage the
EGL_KHR_image_pixmap extension explicitly states that EGL_NO_CONTEXT
must also be passed so we are now careful to do this.
Reviewed-by: Neil Roberts <neil@linux.intel.com>
When we need to guarantee that the glColorMask is re-asserted the next
time that a primitive is drawn it is not enough to just OR in the
LOGIC_OPS flag to ctx->current_pipeline_changes_since_flush because
_cogl_pipeline_flush_gl_state actually checks the age of the pipeline
before checking that. If the pipeline hasn't aged then we bail out
early. This makes sure we decrement
ctx->current_pipeline_changes_since_flush so the next time we come to
flush a pipeline we will see a differing age.
Reviewed-by: Neil Roberts <neil@linux.intel.com>
In cogl_quaternion_init_from_array we were passing the address of the x
component as the destination for memcpy, but that was wrong at least
because w is actually the first member in the structure. Another
concern raised was whether it was safe to assume that there was no
padding within the CoglQuaternion struct with some compilers so we also
switch to explicitly indexing each element of the array we want to copy.
In practice I think it's pretty safe to assume that padding will only be
introduced to ensure members are naturally aligned, but being explicit
is readable and it can't hurt to be extra cautious.
Another good catch in bug #655228 was that in
cogl_quaternion_get_rotation_axis we had a copy and paste error at the
end where we finally extract the axis and we were repeatedly calculating
just the x component. Now we calculate the y and z components too.
Thanks to Bug #655228 for identifying these issues.
https://bugzilla.gnome.org/show_bug.cgi?id=655228
Reviewed-by: Neil Roberts <neil@linux.intel.com>
Previously, _cogl_get_proc_address had a fallback to resolve the
symbol using g_module_open(NULL) to get the symbol from anywhere in
the address space. The EGL backend ends up using this on some drivers
because eglGetProcAddress isn't meant to return a pointer for core
functions. This causes problems if something in the process is linking
against a different GL library, for example Cairo may be linking
against libGL itself. In this case it may end up resolving symbols
from the GL library even if GLES is being used.
This patch removes the fallback. The EGL version now has its own
fallback instead which passes the existing libgl_module from the
renderer to g_module_symbol so that it should only get symbols from
that library or its dependency chain. The GLX and WGL winsys only call
glXGetProcAddress and wglGetProcAddress. The stub winsys does however
continue using the global symbol lookup.
The internal _cogl_get_proc_address function has been renamed to
_cogl_renderer_get_proc_address because it needs a connected renderer
to work so it could be considered to be a renderer method. The pointer
to the renderer is passed down to the winsys backends so that it can
use the data attached to the renderer to get the module pointers.
https://bugzilla.gnome.org/show_bug.cgi?id=655412
Reviewed-by: Robert Bragg <robert@linux.intel.com>
The template_pipeline variable in _cogl_pipeline_fragend_arbfp_start
was not being initialised if the program caches are disabled with
COGL_DEBUG=disable-program-caches so it would crash. The other
backends have a similar variable but they already initialise it.
https://bugzilla.gnome.org/show_bug.cgi?id=655400
This exposes 2 experimental functions that make it possible to upload a
subregion of a texture from a CoglBuffer by first wrapping the buffer as
a CoglBitmap and then allowing uploading of a subregion from a
CoglBitmap. The new functions are:
cogl_bitmap_new_from_buffer() and
cogl_texture_set_region_from_bitmap()
Actually for now we are exporting this API for practical reasons since
we already had this API internally and it enables a specific feature
that was requested, but it is worth nothing that it's quite likely we
will replace these with functions that don't involve the CoglBitmap API
at some point.
For reference: The CoglBitmap API was actually removed from the 2.0
experimental API reference manual some time ago because the hope was
that we'd come up with a neater replacement. It doesn't seem entirely
clear what the scope of the CoglBitmap api is so it has became a bit of
a dumping ground. CoglBitmap is used for image loading, as a means to
represent the layout of image data and also internally deals with format
conversions.
Note: Because we are avoiding including CoglBitmap as part of the 2.0
API these functions aren't currently included in the 2.0 reference
manual.
Reviewed-by: Neil Roberts <neil@linux.intel.com>
in cogl-ext-functions.h we had one multitexture feature that checked for
the ARB_multitexture extension and if found it then expected to find
glActiveTexture and glClientActiveTexture. The problem is that the
multitexture extension is part of the core GLES 1 and 2 APIs except that
for GLES2 there is no glClientActiveTexture function. By trying to
handle it as one feature that meant that Cogl would fail to check the
multitexture extension which is a hard requirement for Cogl.
The reason this went unnoticed is because Cogl can indirectly end up
linked to an OpenGL library via cairo and so we were finding a
glClientActiveTexture symbol there. This highlights that we should
probably stop using g_module_open (NULL) when checking features and
instead we should use the module we opened in cogl-renderer.c.
This adds CoglPipeline and CoglFramebuffer support for setting a color
mask which is a bit mask defining which color channels should be written
to the current framebuffer.
The final color mask is the intersection of the framebuffer color mask
and the pipeline color mask. The framebuffer mask affects all rendering
to the framebuffer while the pipeline masks can be used to affect
individual primitives.
Reviewed-by: Neil Roberts <neil@linux.intel.com>
Instead of using g_module_build_path with the short name of the GL
library (eg, "GL") and relying on glib to add the suffix and prefix,
the configure script now directly encodes the full name including the
version number (eg, "libGL.so.1"). This is necessary because distros
don't always install the non-versioned suffix for the library.
The GLES libraries are left without the version suffix because it's
not clear what should be placed here and I can't find any
documentation from Khronos to clarify this. Mesa seems to install a
file called libGLESv2.so.2 but the IMG SDK doesn't install any
versioned library. There is an example of dynamically loading
libGLESv2 in the Chromium source code and that does not use the
version suffix even though it does use the version suffix for GL. This
implies that it's at least fairly normal to load the unversioned name
for GLES.
https://bugzilla.gnome.org/show_bug.cgi?id=654593
When we moved all the GL function pointers to be part of CoglContext in
commit dae02a99a5 we made a mistake and started to OR in the private
COGL_PRIVATE_FEATURE_TEXTURE_2D_FROM_EGL_IMAGE feature flag into the non
private flags which would mean cogl would think the GL_OES_EGL_image
extension wasn't supported.
Reviewed-by: Neil Roberts <neil@linux.intel.com>
This makes sure the egl winsys frees the private egl_tex_pixmap state if
in _cogl_winsys_texture_pixmap_x11_create if there is a failure to
create an EGLImage.
Reviewed-by: Neil Roberts <neil@linux.intel.com>
If _cogl_winsys_texture_pixmap_x11_create() fails then implicitly no
private state has been associated with the given tex_pixmap. Since that
winsys isn't associated with it we explicitly set tex_pixmap->winsys =
NULL.
Reviewed-by: Neil Roberts <neil@linux.intel.com>
This ensures that tex_pixmap->use_winsys_texture is always initialized
during cogl_texture_pixmap_x11_new - either according to the result of
winsys->texture_pixmap_x11_create, or if the winsys doesn't support tfp
we explicitly initialize to FALSE.
Reviewed-by: Neil Roberts <neil@linux.intel.com>
The _cogl_context_check_gl_version function is meant to be called once
Cogl has a GL context so that it can check whether the context found
is supported by Cogl. However, only the stub winsys was calling this
and it was doing it before Cogl had a chance to retrieve the function
pointer for glString so it would just crash. This patch combines the
two functions into one so that _cogl_context_update_features returns a
gboolean and a GError. Then it can just check the context itself.
https://bugzilla.gnome.org/show_bug.cgi?id=654440
Reviewed-by: Robert Bragg <robert@linux.intel.com>
cogl_read_pixels returns image data in a top-down memory order, but
because OpenGL normally returns pixel data in a bottom-up order we
have to flip the data before returning it to the user. If the OpenGL
driver supports the GL_MESA_pack_invert extension though we can ask the
driver to return the data in a top-down order in the first place.
Signed-off-by: Neil Roberts <neil@linux.intel.com>
cogl-winsys-egl-feature-functions.h was unconditionally depending on the
struct wl_display type being defined. This guards the check for the
"WL_bind_wayland_display" extension with
#ifdef COGL_HAS_EGL_PLATFORM_WAYLAND_SUPPORT
Signed-off-by: Neil Roberts <neil@linux.intel.com>
This adds a getter and setter for requesting dithering to be enabled.
Dithering is a hardware dependent technique to increase the visible
color resolution beyond what the underlying hardware supports by playing
tricks with the colors placed into the framebuffer to give the illusion
of other colors. (For example this can be compared to half-toning used
by some news papers to show varying levels of grey even though their may
only be black and white are available).
The results of enabling dithering are platform dependent and may have no
effect.
Signed-off-by: Neil Roberts <neil@linux.intel.com>
The CoglPipelineCache is now extended to store templates for state
affecting vertex shaders and combined programs. The GLSL fragend,
vertend and progend now uses this to get cached shaders and a program.
When a new pipeline is created it will now get hashed three times if
the GLSL backends are in use (once for the fragend, once for the
vertend and once for the progend). Ideally we should add some way for
the progend to check its cache before the fragends and vertends are
checked so that it can bypass them entirely if it can find a cached
combined program.
The pipeline cache is now handled in CoglPipelineCache instead of
directly in the ARBfp fragend. The flags needed to hash a pipeline
should be exactly the same for the ARBfp and GLSL fragends so it's
convenient to share the code. The hash table now stores the actual
pipeline as the value instead of the private data so that the two
fragends can attach their data to it. That way it's possible to use
the same pipeline key with ancestors that are using different
fragends.
The hash table is created with g_hash_table_new_full to set a
destructor for the key and value and there is a destructor for
CoglPipelineCache that gets called when the CoglContext is
destroyed. That way we no longer leak the pipelines and shader state
when the context is desroyed.
Previously the fragends had a separate private data pointer which was
used by the GLSL and ARBfp fragends to store a tiny struct containing
a single pointer to the ref-counted shader state. The space for the
private data pointer is reserved in all of the pipelines for all of
the potential backends. The vertends and progends however did this
differently by directly storing the pointer to the ref counted data
using cogl_object_set_user_data. This patch unifies the different
methods so that they all use cogl_object_set_user_data and the
fragends don't bother with the separate tiny allocation for the
private data. The private data pointer array has been removed from
CoglPipeline and the corresponding fragend virtual to free the private
data has also been removed because this can instead be done with the
destroy notify from the object user data.
The variable names used have been unified so that all of the vertends
and fragends name their data struct CoglPipelineShaderState and use a
variable called shader_state to refer to it. The progend uses
CoglPipelineProgramState and a variable called program_state.
This should also fix two potential bugs. the ARBfp fragend was
apprently leaking a reference to the private state when it creates the
private data because it was adding a reference before stroring the
pointer to the newly allocated data but the ref count is already set
to 1 on creation. The other potential bug is that the free function
for CoglPipeline was only calling the free_priv virtual for the
currently used fragend of the pipeline. The design of the fragends is
meant to allow a pipeline to have multiple fragend priv datas because
a child pipeline could be attaching its fragend data to the ancestor
and its allowed to pick a different fragend.
That list is tracking the layers for get_layers_list() and needs to be
freed later on. However _copy() did not initialize it and we ended up
trying to free some garbage pointer.
_cogl_pipeline_get_layers() allocates a list on the pipeline to be able
to get the pointer valid as long as possible and store that list in the
pipeline object.
You need to free that list when freeing the pipeline.
Signed-off-by: Robert Bragg <robert@linux.intel.com>
cogl-winsys-egl-feature-functions.h wasn't being listed as source and so
it wasn't ending up in dist tarballs.
Signed-off-by: Neil Roberts <neil@linux.intel.com>
This renames cogl_context_egl_get_egl_context to
cogl_egl_context_get_egl_context to be consistent with other platform
specific APIs.
Signed-off-by: Neil Roberts <neil@linux.intel.com>
For cogl 2.0 we don't want to have a default context. In the meantime
we can simply assume that calling cogl_context_new() implicitly
sets that context as the default context before returning.
Signed-off-by: Neil Roberts <neil@linux.intel.com>
There were several CoglOnscreen functions named like:
cogl_onscreen_<platform>_blah instead of cogl_<platform>_onscreen_blah
so this patch updates those to be consistent with other platform
specific apis we have in cogl.
Signed-off-by: Neil Roberts <neil@linux.intel.com>
The GL or GLES library is now dynamically loaded by the CoglRenderer
so that it can choose between GL, GLES1 and GLES2 at runtime. The
library is loaded by the renderer because it needs to be done before
calling eglInitialize. There is a new environment variable called
COGL_DRIVER to choose between gl, gles1 or gles2.
The #ifdefs for HAVE_COGL_GL, HAVE_COGL_GLES and HAVE_COGL_GLES2 have
been changed so that they don't assume the ifdefs are mutually
exclusive. They haven't been removed entirely so that it's possible to
compile the GLES backends without the the enums from the GL headers.
When using GLX the winsys additionally dynamically loads libGL because
that also contains the GLX API. It can't be linked in directly because
that would probably conflict with the GLES API if the EGL is
selected. When compiling with EGL support the library links directly
to libEGL because it doesn't contain any GL API so it shouldn't have
any conflicts.
When building for WGL or OSX Cogl still directly links against the GL
API so there is a #define in config.h so that Cogl won't try to dlopen
the library.
Cogl-pango previously had a #ifdef to detect when the GL backend is
used so that it can sneakily pass GL_QUADS to
cogl_vertex_buffer_draw. This is now changed so that it queries the
CoglContext for the backend. However to get this to work Cogl now
needs to export the _cogl_context_get_default symbol and cogl-pango
needs some extra -I flags to so that it can include
cogl-context-private.h
The texture driver functions are now accessed through a vtable pointed
to by a struct in the CoglContext so that eventually it will be
possible to compile both the GL and GLES texture drivers into a single
binary and then select between them at runtime.
Since the GL function pointers have move to the root of CoglContext,
the driver specific data for GLES became empty and the GL data had
only one varible which apparently nothing was using. It's therefore
convenient to remove the private driver data to make it easier to have
a build of Cogl which enables both GL and GLES support. If we ever
need driver private data later we might want to use
cogl_object_set_user_data instead.
cogl-ext-functions.h now contains definitions for all of the core GL
and GLES functions that we would normally link to directly. All of the
code has changed to access them through the cogl context pointer. The
GE macro now takes an extra parameter to specify the context because
the macro itself needs to make GL calls but various points in the Cogl
source use different names for the context variable.
Instead of storing all of the feature function pointers in the driver
specific data of the CoglContext they are now all stored directly in
CoglContext. There is a single header containing the description of
the functions which gets included by cogl-context.h. There is a single
function in cogl-feature-private.c to check for all of these
functions.
The name of the function pointer variables have been changed from
ctx->drv.pf_glWhatever to just ctx->glWhatever.
The feature flags that get set when an extension is available are now
separated from the table of extensions. This is necessary because
different extensions can mean different things on GLES and GL. For
example, having access to glMapBuffer implies read and write support
on GL but only write support on GLES. The flags are instead set in the
driver specific init function by checking whether the function
pointers were successfully resolved.
_cogl_feature_check has been changed to assume the feature is
supported if any of the listed extensions are available instead of
requiring all of them. This makes it more convenient to specify
alternate names for the extension. Nothing else had previously listed
more than one name for an extension so this shouldn't cause any
problems.
When a copy is made of a weak pipeline it tries to promote the weak
parent by taking a reference on that weak pipeline's parent. However
promote_weak_ancestors was instead always taking a reference on the
first parent, regardless of whether it was weak. The corresponding
revert_weak_ancestors function which is supposed to undo the effect of
promote_weak_ancestors only unref'd the parent if was weak. This meant
that any non-weak pipeline copy would end up leaking a reference on
its parent.
This patch changes both functions to have a similar loop. It loops
through all of the parents of the pipeline until it finds one that is
not weak and refs or unrefs the *parent* of that pipeline instead of
the pipeline itself.
Signed-off-by: Robert Bragg <robert@linux.intel.com>
This removes the unused COGL_PRIVATE_FEATURE_EGL flags since
check_egl_extensions doesn't refer to these flags it uses the
COGL_EGL_WINSYS_FEATURE flags.
Signed-off-by: Neil Roberts <neil@linux.intel.com>
instead of looking at the ctx->private_feature_flags to determine if
Cogl supports creating an EGLImage from a X Pixmap we now check the
renderer private features instead since these are what get setup in
check_egl_extensions. The conflicting flags defined in cogl-internal.h
should be removed since they are un-used.
Signed-off-by: Neil Roberts <neil@linux.intel.com>
check_egl_extensions was mistakenly always ORing in the priv flags of
the first feature_data entry instead of referencing the i variable to
index into the array of feature data after determining that an extension
is available.
Signed-off-by: Neil Roberts <neil@linux.intel.com>
This adds a description for the cogl-framebuffer section and adds lots
of missing symbols to the 2.0 reference manual.
Signed-off-by: Neil Roberts <neil@linux.intel.com>
This exposes the previously internal only
_cogl_framebuffer_get_red/green/blue/alpha_bits() functions as 2.0
experimental API.
Signed-off-by: Neil Roberts <neil@linux.intel.com>
This adds a function called cogl_matrix_is_identity that can determine
if a given matrix is an identity matrix or not.
Signed-off-by: Neil Roberts <neil@linux.intel.com>
It has been overly cumbersome to work with the matrix code ever since we
pulled in the mesa code because we initially kept the mesa and the
original cogl code separate. We have made several updates to the mesa
code since integrating, and the coding style has changed a lot compared
to the original mesa code, so there's little point in keeping the two
files separate any longer.
Signed-off-by: Neil Roberts <neil@linux.intel.com>
Instead of having everything in cogl-matrix-mesa.[ch] be in the
_math namespace this now puts them in the _cogl_matrix namespace
instead, in preparation for flattening cogl-matrix-mesa.[ch] into
cogl-matrix.[ch].
Signed-off-by: Neil Roberts <neil@linux.intel.com>
The aim is to flatten cogl-matrix-mesa.[ch] code back into
cogl-matrix.[ch] and removing cruft first makes sense. This removes
several un-used macros and vector related functions and also replaces
the use of doxygen style comment markup with the gtk-doc style we use
throughout the reset of cogl.
Signed-off-by: Neil Roberts <neil@linux.intel.com>
Instead of having a separate GList for the children we can use the
linked list code from FreeBSD and store the list node directly in the
struct. That way we can avoid having a separate slice allocation for
the list node. It also means that we effectively have a pointer to the
list node given a pointer to the pipeline node. That means we can
unparent a pipeline without having to walk the entire list of
children. With this change there is no need to have the optimisation
to fast track a pipeline that only has one child which simplifies the
code somewhat.
With this patch we are removing a pointer and a gboolean from the
CoglPipeline struct and adding two pointers. On 32-bit architectures
this should end up exactly the same size because a gboolean is the
same size as a pointer. On 64-bit architectures I think it should end
up 4 bytes smaller because it also ends up removing two cases where a
pointer follows a gboolean which presumably would mean the compiler
would have to insert 4 bytes of padding to keep the pointer aligned to
8 bytes.
https://bugzilla.gnome.org/show_bug.cgi?id=652514
This modifies cogl-queue.h so that:-
- Everything is in a COGL_* namespace
- It assumes there is a typedef for all of the types instead of
requiring the code to use struct WhateverType.
- It doesn't contain any tabs
https://bugzilla.gnome.org/show_bug.cgi?id=652514
This directly copies in the header from the FreeBSD kernel for their
linked-list implementation. A later patch will modify it but this
patch is here so we can have a clear patch to show what the
changes are.
Using the list implementation from this header is beneficial as
opposed to using GList because it's possible to embed the list
pointers directly into another struct. This saves a separate
allocation and it also makes it possible to remove an item from the
list without having to iterate the entire list to find its list
node. The header provides four different list types: single and
doubley linked lists and each of them can either have a header with
pointers to the beginning and end or just to the beginning. Glib
effectively only provides single and doubley linked lists with a
pointer to the beginning or a doubley-linked list with a pointer to
both (GQueue).
https://bugzilla.gnome.org/show_bug.cgi?id=652514
The function declarations for the GL_OES_EGL_image extension were
using the wrong name for the GLeglImageOES type so it was getting
build errors when compiling for GLES.
This adds a cogl-win32-renderer.h for the win32 specific cogl-renderer
API instead of having #ifdef guards in cogl-renderer.h
Signed-off-by: Neil Roberts <neil@linux.intel.com>
This updates the public wayland symbols to follow the pattern
cogl_wayland_blah instead of cogl_blah_wayland.
Signed-off-by: Neil Roberts <neil@linux.intel.com>
we've got into a bit of a mess with how we name platform specific
symbols and files, so this is a first pass at trying to tidy that up.
All platform specific symbols should be named like
cogl_<platform>_symbol_name and similarly files should be named like
cogl-<platform>-filename.c
This patch tackles the X11 specific renderer/display APIs as a start.
Signed-off-by: Neil Roberts <neil@linux.intel.com>
This adds Xlib and Win32 typesafe replacements for
cogl_renderer_handle_native_event, cogl_renderer_add_native_filter,
cogl_renderer_remove_native_filter. The old functions are kept as an
implementation detail so we can share code.
Signed-off-by: Neil Roberts <neil@linux.intel.com>
It used to be that we passed around NULL terminated arrays of
attributes, but since 3c1e83c7f we now explicitly pass an n_attributes
count instead. There were some leftovers of the old approach in the
cogl_vdraw_[indexed]_attributes functions and also there was an
off-by-one error with the n_attributes values passed on which was
causing crashes.
Signed-off-by: Neil Roberts <neil@linux.intel.com>
When setting a NULL texture on a CoglPipeline we would also reset the
texture target to a dummy value of 0. Reseting the target also had the
effect of making fragends discard any associated program. In cases where
the NULL texture was only transient until a replacement texture could be
set we were re-running lots of redundant codegen and shader
compilations.
Signed-off-by: Neil Roberts <neil@linux.intel.com>
There is a documented rule that layer changes should only be notified to
the fragend once; either as a pipeline change or as a layer change. When
the number of layers associated with a material changes then that should
get notified against the pipeline. All other layer changes get notified
against the layer.
There was a mistake in the _cogl_pipeline_add/remove_layer_difference
functions, in that we weren't using the 'inc/dec_n_layers' boolean to
determine if the fragend should be notified of the change.
It was also noticed that the logic of _cogl_pipeline_prune_to_n_layers
would also break this rule, by failing to notify some changes at all.
Signed-off-by: Neil Roberts <neil@linux.intel.com>
This adds API to let you override the choice of Cogl's winsys backend.
Previously it was only possible to override the winsys using the
COGL_RENDERER environment variable, but it's useful for something like
Clutter to be able to control the winsys via API without needing
environment variable tricks. This also adds API to query back the
winsys chosen by Cogl, in case you don't set an explicit override.
Signed-off-by: Neil Roberts <neil@linux.intel.com>
This exposes experimental cogl_framebuffer APIs for getting and setting
a viewport without having to refer to the implicit CoglContext. It adds
the following experimental API:
cogl_framebuffer_set_viewport
cogl_framebuffer_get_viewport4fv
cogl_framebuffer_get_viewport_x
cogl_framebuffer_get_viewport_y
cogl_framebuffer_get_viewport_width
cogl_framebuffer_get_viewport_height
Signed-off-by: Neil Roberts <neil@linux.intel.com>
This adds a _cogl_init function for Cogl that we expect to be the first
thing called before anything else is done with Cogl. It's not a public
API so it's expected that all entry points for Cogl that might be the
first function used should call _cogl_init().
We currently call _cogl_init() in these functions:
cogl_renderer_new
cogl_display_new
cogl_context_new
cogl_android_set_native_window
_cogl_init() can be called multiple times, and only the first call has
any affect.
For example _cogl_init() gives us a place check and parse the COGL_DEBUG
environment variable.
Since we don't have any need to parse command line arguments (we can
always get user configuration options from the environment) our init
function doesn't require argc/argv pointers.
By saying up front that we aren't interested in command line arguments
that means we can avoid the mess that is GOption based library
initialization which is extremely fragile due to its lack of dependency
tracking between modules.
Signed-off-by: Neil Roberts <neil@linux.intel.com>
