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
