Commit Graph

166 Commits

Author SHA1 Message Date
Robert Bragg
426c8b8f41 features: Support more than 32 features!
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>
2011-11-01 12:03:01 +00:00
Robert Bragg
c86f698eb9 make COGL_FEATURE_VBOS a private feature
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>
2011-11-01 12:03:01 +00:00
Robert Bragg
69b44ac86d make COGL_FEATURE_PBOS a private feature
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>
2011-11-01 12:03:01 +00:00
Robert Bragg
d045bea70e make COGL_FEATURE_FOUR_CLIP_PLANES a private feature
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>
2011-11-01 12:03:00 +00:00
Robert Bragg
abbd28f484 make COGL_FEATURE_OFFSCREEN_BLIT a private feature
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>
2011-11-01 12:03:00 +00:00
Robert Bragg
b566170836 make COGL_FEATURE_STENCIL_BUFFER private
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>
2011-11-01 12:03:00 +00:00
Robert Bragg
6da3bff9b9 Remove beneign GL_MESA_ycbcr_texture check
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>
2011-11-01 12:03:00 +00:00
Robert Bragg
dd7b16faf2 offscreen: Adds support for offscreen multisampling
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>
2011-10-28 19:10:16 +01:00
Neil Roberts
93e69387cc Add the missing check for COGL_FEATURE_POINT_SPRITE on the GL driver
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>
2011-08-01 14:05:09 +01:00
Neil Roberts
d259a87602 Don't use the 'NULL' GModule to resolve GL symbols
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>
2011-07-27 16:10:02 +01:00
Robert Bragg
eb578e4e0c gles: Or in private features into ctx->private_feature_flags
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>
2011-07-19 14:40:29 +01:00
Neil Roberts
231be91fb0 Combine _cogl_context_check_gl_version and update_features into one
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>
2011-07-18 15:41:35 +01:00
Robert Bragg
6f79eb8a5a Use MESA_pack_invert to avoid read_pixels flip
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>
2011-07-13 19:06:19 +01:00
Neil Roberts
b2e735ff7f Dynamically load the GL or GLES library
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
2011-07-11 12:57:38 +01:00
Neil Roberts
5f181973a6 Move the cogl texture driver functions to a vtable
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.
2011-07-08 15:35:51 +01:00
Neil Roberts
59f746d281 cogl-context: Remove the driver private data
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.
2011-07-08 15:35:50 +01:00
Neil Roberts
2b119b07da Use all core GL functions through indirect pointers
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.
2011-07-08 15:35:46 +01:00
Neil Roberts
dae02a99a5 Move all of the GL function pointers directly to CoglContext
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.
2011-07-07 02:05:42 +01:00
Neil Roberts
a517242087 gles: Fix the name of the GLeglImageOES type
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.
2011-07-01 14:30:59 +01:00
Robert Bragg
60b25615fd Add _cogl_egl_texture_2d_new_from_image API
This adds an internal texture_2d constructor that can wrap an EGLImage
as a CoglTexture2D. The plan is to utilize this for texture-from-pixmap
support with EGL as well as creating textures from wayland buffers.
2011-06-01 20:44:42 +01:00
Robert Bragg
be15bf75e4 Add internal _cogl_get_proc_address
This adds an internal _cogl_get_proc_address that doesn't need a
CoglContext. This will enable us to check driver features earlier.
2011-06-01 20:44:41 +01:00
Robert Bragg
07c0b9f89f Add CoglDepthState API
Instead of simply extending the cogl_pipeline_ namespace to add api for
controlling the depth testing state we now break the api out. This adds
a CoglDepthState type that can be stack allocated. The members of the
structure are private but we have the following API to setup the state:

    cogl_depth_state_init
    cogl_depth_state_set_test_enabled
    cogl_depth_state_get_test_enabled
    cogl_depth_state_set_test_function
    cogl_depth_state_get_test_function
    cogl_depth_state_set_writing_enabled
    cogl_depth_state_get_writing_enabled
    cogl_depth_state_set_range
    cogl_depth_state_get_range

This removes the following experimental API which is now superseded:

    cogl_material_set_depth_test_enabled
    cogl_material_get_depth_test_enabled
    cogl_material_set_depth_test_function
    cogl_material_get_depth_test_function
    cogl_material_set_depth_writing_enabled
    cogl_material_get_depth_writing_enabled
    cogl_material_set_depth_range
    cogl_material_get_depth_range

Once a CoglDepthState structure is setup it can be set on a pipeline
using cogl_pipeline_set_depth_state().
2011-05-16 18:36:44 +01:00
Robert Bragg
a8c7f43a7c cogl-gl.c: remove really_enable_npot hack for OSX
This is a workaround for a bug on OSX for some radeon hardware that
we can't verify and the referenced bug link is no longer valid.

If this is really still a problem then a new bug should be opened and we
can look at putting the fix in some more appropriate place than
cogl-gl.c
2011-05-05 15:05:41 +01:00
James Athey
d0739ca0ba GL_IMG_TEXTURE_NPOT extension enables TEXTURE_NPOT features on GLES
Older drivers for PowerVR SGX hardware have the vendor-specific
GL_IMG_TEXTURE_NPOT extension instead of the
functionally-equivalent GL_OES_TEXTURE_NPOT extension.
2011-04-13 14:34:31 +01:00
Robert Bragg
d40cdfa3e1 Moves all GLX code down from Clutter to Cogl
This migrates all the GLX window system code down from the Clutter
backend code into a Cogl winsys. Moving OpenGL window system binding
code down from Clutter into Cogl is the biggest blocker to having Cogl
become a standalone 3D graphics library, so this is an important step in
that direction.
2011-04-11 17:54:36 +01:00
Robert Bragg
c415818537 cogl: consolidate _create_context_driver + _features_init
This moves the functionality of _cogl_create_context_driver from
driver/{gl,gles}/cogl-context-driver-{gl,gles}.c into
driver/{gl,gles}/cogl-{gl,gles}.c as a static function called
initialize_context_driver.

cogl-context-driver-{gl,gles}.[ch] have now been removed.
2011-04-11 15:26:25 +01:00
Robert Bragg
fdbc741770 cogl: rename cogl-context.h cogl-context-private.h
Since we plan to add public cogl_context_* API we need to rename the
current cogl-context.h which contains private member details.
2011-04-11 15:18:12 +01:00
Neil Roberts
392cfb493a cogl-gles: Check for the GL_ANGLE_framebuffer_blit extension
This extension is the GLES equivalent of the GL_EXT_framebuffer_blit
extension except that it has some extra restrictions. We need to check
for some extension that provides glBlitFramebuffer so that we can
unconditionally use ctx->drv.pf_glBlitFramebuffer in both GL and GLES
code. Even with the restrictions, the extension provides enough
features for what Cogl needs.
2011-02-15 12:10:54 +00:00
Neil Roberts
4f08e3cf6e cogl-buffer: Support mapping buffers for write on GLES
GLES has an extension called GL_OES_mapbuffer to support mapping
buffer objects but only for writing. Cogl now has two new feature
flags to advertise whether mapping for reading and writing is
supported. Under OpenGL, these features are always set if the VBO
extension is advertised and under GLES only the write flag is set if
the GL_OES_mapbuffer extension is advertised.
2011-01-13 16:36:45 +00:00
Neil Roberts
36b996672c cogl: Enable the VBOs feature for GLES2
The GLES2 wrapper code has been removed so there are no longer any
problems with enabling VBOs.
2011-01-13 16:36:45 +00:00
Neil Roberts
0f43e01cbc cogl-texture-driver-gles: Don't copy the bitmap if alignment matches
When uploading data for GLES we need to deal with cases where the
rowstride is too large to be described only by GL_UNPACK_ALIGNMENT
because there is no GL_UNPACK_ROW_LENGTH. Previously for the
sub-region uploading code it would always copy the bitmap and for the
code to upload the whole image it would copy the bitmap unless the
rowstride == bpp*width. Neither paths took into account that we don't
need to copy if the rowstride is just an alignment of bpp*width. This
moves the bitmap copying code to a separate function that is used by
both upload methods. It only copies the bitmap if the rowstride is not
just an alignment of bpp*width.

http://bugzilla.clutter-project.org/show_bug.cgi?id=2491
2011-01-10 16:55:00 +00:00
Neil Roberts
dc1f1949d0 Remove the GLES2 wrapper
The GLES2 wrapper is no longer needed because the shader generation is
done within the GLSL fragend and vertend and any functions that are
different for GLES2 are now guarded by #ifdefs.
2010-12-13 17:29:14 +00:00
Neil Roberts
a05c701e6b cogl: upload matrices with uniforms on GLES2
Once the GLES2 wrapper is removed we won't be able to upload the
matrices with the fixed function API any more. The fixed function API
gives a global state for setting the matrix but if a custom shader
uniform is used for the matrices then the state is per
program. _cogl_matrix_stack_flush_to_gl is called in a few places and
it is assumed the current pipeline doesn't need to be flushed before
it is called. To allow these semantics to continue to work, on GLES2
the matrix flush now just stores a reference to the matrix stack in
the CoglContext. A pre_paint virtual is added to the progend which is
called whenever a pipeline is flushed, even if the same pipeline was
flushed already. This gives the GLSL progend a chance to upload the
matrices to the uniforms. The combined modelview/projection matrix is
only calculated if it is used. The generated programs end up never
using the modelview or projection matrix so it usually only has to
upload the combined matrix. When a matrix stack is flushed a reference
is taked to it by the pipeline progend and the age is stored so that
if the same state is used with the same program again then we don't
need to reupload the uniform.
2010-12-13 17:29:13 +00:00
Neil Roberts
fa13f6c107 cogl: Add a vertend to generate GLSL
The GLSL vertend is mostly only useful for GLES2. The fixed function
vertend is kept at higher priority than the GLSL vertend so it is
unlikely to be used in any other circumstances.
2010-12-13 17:28:28 +00:00
Neil Roberts
6b7139b008 cogl-pipeline: Move texture enabling/disabling to fixed fragend
Previously enabling and disabling textures was done whatever the
backend in cogl-pipeline-opengl. However enabling and disabling
texture targets only has any meaning if no fragment shaders are being
used so this patch moves the code to cogl-pipeline-fragend-fixed.

The GLES2 wrapper has also been changed to ignore enabledness when
deciding whether to update texture coordinate attribute pointers.
2010-12-13 17:22:57 +00:00
Neil Roberts
7474d320f6 cogl-context: Get rid of the features_cached member
The features_cached member of CoglContext is intended to mark when
we've calculated the features so that we know if they are ready in
cogl_get_features. However we always intialize the features while
creating the context so features_cached will never be FALSE so it's
not useful. We also had the odd behaviour that the COGL_DEBUG feature
overrides were only applied in the first call to
cogl_get_features. However there are other functions that use the
feature flags such as cogl_features_available that don't use this
function so in some cases the feature flags will be interpreted before
the overrides are applied. This patch makes it always initialize the
features and apply the overrides immediately while creating the
context. This fixes a problem with COGL_DEBUG=disable-arbfp where the
first material flushed is done before any call to cogl_get_features so
it may still use ARBfp.
2010-11-24 18:39:07 +00:00
Neil Roberts
c50cb72748 Remove the fragment shader generation from the GLES2 wrapper
The GLES2 wrapper no longer needs to generate any fragment shader
state because the GLSL pipeline backend will always give the wrapper a
custom fragment shader. This simplifies a lot of the state comparison
done by the wrapper. The fog generation is also removed even though
it's actually part of the vertex shader because only the fixed
function pipeline backend actually calls the fog functions so it would
be disabled when using any of the other backends anyway. We can fix
this when the two shader backends also start generating vertex
shaders.
2010-11-24 18:06:44 +00:00
Neil Roberts
38929d55c9 cogl-texture-driver-gles: Fix image height for uploading 3D textures
When uploading a 3D texture with an awkward rowstride, on GLES Cogl
will copy the images to an intermediate buffer to pass to GL. However
it was using the wrong height when copying the data so it would end up
overflowing the buffer and crashing.
2010-11-23 14:12:17 +00:00
Robert Bragg
353ea5299b cogl-shader: Prepend boilerplate for portable shaders
We now prepend a set of defines to any given GLSL shader so that we can
define builtin uniforms/attributes within the "cogl" namespace that we
can use to provide compatibility across a range of the earlier versions
of GLSL.

This updates test-cogl-shader-glsl.c and test-shader.c so they no longer
needs to special case GLES vs GL when splicing together its shaders as
well as the blur, colorize and desaturate effects.

To get a feel for the new, portable uniform/attribute names here are the
defines for OpenGL vertex shaders:

 #define cogl_position_in gl_Vertex
 #define cogl_color_in gl_Color
 #define cogl_tex_coord_in  gl_MultiTexCoord0
 #define cogl_tex_coord0_in gl_MultiTexCoord0
 #define cogl_tex_coord1_in gl_MultiTexCoord1
 #define cogl_tex_coord2_in gl_MultiTexCoord2
 #define cogl_tex_coord3_in gl_MultiTexCoord3
 #define cogl_tex_coord4_in gl_MultiTexCoord4
 #define cogl_tex_coord5_in gl_MultiTexCoord5
 #define cogl_tex_coord6_in gl_MultiTexCoord6
 #define cogl_tex_coord7_in gl_MultiTexCoord7
 #define cogl_normal_in gl_Normal

 #define cogl_position_out gl_Position
 #define cogl_point_size_out gl_PointSize
 #define cogl_color_out gl_FrontColor
 #define cogl_tex_coord_out gl_TexCoord

 #define cogl_modelview_matrix gl_ModelViewMatrix
 #define cogl_modelview_projection_matrix gl_ModelViewProjectionMatrix
 #define cogl_projection_matrix gl_ProjectionMatrix
 #define cogl_texture_matrix gl_TextureMatrix

And for fragment shaders we have:

 #define cogl_color_in gl_Color
 #define cogl_tex_coord_in gl_TexCoord

 #define cogl_color_out gl_FragColor
 #define cogl_depth_out gl_FragDepth

 #define cogl_front_facing gl_FrontFacing
2010-11-10 14:24:52 +00:00
Neil Roberts
2a7e7fb6d3 cogl-gles2-wrapper: Fix a reference to the old name for CoglPipeline
The GLES2 wrapper was referring to COGL_MATERIAL_PROGRAM_TYPE_GLSL but
this has since been renamed to COGL_PIPELINE_PROGRAM_TYPE_GLSL so the
GLES2 backend wouldn't compile.
2010-11-04 14:56:44 +00:00
Robert Bragg
61bb91a2e7 gles2: disable vbos until while we rework backend
The gles2 wrapper functions don't understand about the CoglBuffer API so
they don't support attributes stored in a CoglVertexArray. Instead of
teaching the backend about buffers we are going to wait until we have
overhauled the GLES 2 backend. We are currently making progress
consolidating the GLES 2 backend with a new GLSL backend for
CoglMaterial. This will hugely simplify the GLES 2 support and share
code with the OpenGL backend. In the end it's hoped that this problem
will simply go away so it doesn't make much sense to solve it with the
current design.
2010-11-03 18:09:23 +00:00
Robert Bragg
f80cb197a9 cogl: rename CoglMaterial -> CoglPipeline
This applies an API naming change that's been deliberated over for a
while now which is to rename CoglMaterial to CoglPipeline.

For now the new pipeline API is marked as experimental and public
headers continue to talk about materials not pipelines. The CoglMaterial
API is now maintained in terms of the cogl_pipeline API internally.
Currently this API is targeting Cogl 2.0 so we will have time to
integrate it properly with other upcoming Cogl 2.0 work.

The basic reasons for the rename are:
- That the term "material" implies to many people that they are
  constrained to fragment processing; perhaps as some kind of high-level
  texture abstraction.
    - In Clutter they get exposed by ClutterTexture actors which may be
      re-inforcing this misconception.
- When comparing how other frameworks use the term material, a material
  sometimes describes a multi-pass fragment processing technique which
  isn't the case in Cogl.
- In code, "CoglPipeline" will hopefully be a much more self documenting
  summary of what these objects represent; a full GPU pipeline
  configuration including, for example, vertex processing, fragment
  processing and blending.
- When considering the API documentation story, at some point we need a
  document introducing developers to how the "GPU pipeline" works so it
  should become intuitive that CoglPipeline maps back to that
  description of the GPU pipeline.
- This is consistent in terminology and concept to OpenGL 4's new
  pipeline object which is a container for program objects.

Note: The cogl-material.[ch] files have been renamed to
cogl-material-compat.[ch] because otherwise git doesn't seem to treat
the change as a moving the old cogl-material.c->cogl-pipeline.c and so
we loose all our git-blame history.
2010-11-03 18:09:23 +00:00
Neil Roberts
63206a208b Merge cogl-program-{gl,gles}.c into one cogl-program.c
This merges the two implementations of CoglProgram for the GLES2 and
GL backends into one. The implementation is more like the GLES2
version which would track the uniform values and delay sending them to
GL. CoglProgram is now effectively just a GList of CoglShaders along
with an array of stored uniform values. CoglProgram never actually
creates a GL program, instead this is left up to the GLSL material
backend. This is necessary on GLES2 where we may need to relink the
user's program with different generated shaders depending on the other
emulated fixed function state. It will also be necessary in the future
GLSL backends for regular OpenGL. The GLSL and ARBfp material backends
are now the ones that create and link the GL program from the list of
shaders. The linked program is attached to the private material state
so that it can be reused if the CoglProgram is used again with the
same material. This does mean the program will get relinked if the
shader is used with multiple materials. This will be particularly bad
if the legacy cogl_program_use function is used because that
effectively always makes one-shot materials. This problem will
hopefully be alleviated if we make a hash table with a cache of
generated programs. The cogl program would then need to become part of
the hash lookup.

Each CoglProgram now has an age counter which is incremented every
time a shader is added. This is used by the material backends to
detect when we need to create a new GL program for the user program.

The internal _cogl_use_program function now takes a GL program handle
rather than a CoglProgram. It no longer needs any special differences
for GLES2. The GLES2 wrapper function now also uses this function to
bind its generated shaders.

The ARBfp shaders no longer store a copy of the program source but
instead just directly create a program object when cogl_shader_source
is called. This avoids having to reupload the source if the same
shader is used in multiple materials.

There are currently a few gross hacks to get the GLES2 backend to work
with this. The problem is that the GLSL material backend is now
generating a complete GL program but the GLES2 wrapper still needs to
add its fixed function emulation shaders if the program doesn't
provide either a vertex or fragment shader. There is a new function in
the GLES2 wrapper called _cogl_gles2_use_program which replaces the
previous cogl_program_use implementation. It extracts the GL shaders
from the GL program object and creates a new GL program containing all
of the shaders plus its fixed function emulation. This new program is
returned to the GLSL material backend so that it can still flush the
custom uniforms using it. The user_program is attached to the GLES2
settings struct as before but its stored using a GL program handle
rather than a CoglProgram pointer. This hack will go away once the
GLSL material backend replaces the GLES2 wrapper by generating the
code itself.

Under Mesa this currently generates some GL errors when glClear is
called in test-cogl-shader-glsl. I think this is due to a bug in Mesa
however. When the user program on the material is changed the GLSL
backend gets notified and deletes the GL program that it linked from
the user shaders. The program will still be bound in GL
however. Leaving a deleted shader bound exposes a bug in Mesa's
glClear implementation. More details are here:

https://bugs.freedesktop.org/show_bug.cgi?id=31194
2010-10-28 19:51:42 +01:00
Damien Lespiau
c6977cdb13 build: Fix EGL/CEX100 build with GLES2
Some headers files have been renamed or removed and the gles(2) did not
compile anymore, fix that.
2010-10-18 16:08:47 +01:00
Emmanuele Bassi
eb179d4b67 build: Start moving to a non-recursive layout
*** WARNING: THIS COMMIT CHANGES THE BUILD ***

Do not recurse into the backend directories to build private, internal
libraries.

We only recurse from clutter/ into the cogl sub-directory; from there,
we don't recurse any further. All the backend-specific code in Cogl and
Clutter is compiled conditionally depending on the macros defined by the
configure script.

We still recurse from the top-level directory into doc, clutter and
tests, because gtk-doc and tests do not deal nicely with non-recursive
layouts.

This change makes Clutter compile slightly faster, and cleans up the
build system, especially when dealing with introspection data.

Ideally, we also want to make Cogl part of the top-level build, so that
we can finally drop the sed trick to change the shared library from the
GIR before compiling it.

Currently disabled:

  ‣ OSX backend
  ‣ Fruity backend

Currently enabled but untested:

  ‣ EGL backend
  ‣ Windows backend
2010-09-29 14:40:15 +01:00
Robert Bragg
8d80a88e14 cogl-program: Adds use_uniform_xyz methods
Instead of exposing an API that provides an OpenGL state machine style
where you first have to bind the program to the context using
cogl_program_use() followed by updating uniforms using
cogl_program_uniform_xyz we now have uniform setter methods that take an
explicit CoglHandle for the program.

This deprecates cogl_program_use and all the cogl_program_uniform
variants and provides the following replacements:
    cogl_program_set_uniform_1i
    cogl_program_set_uniform_1f
    cogl_program_set_uniform_int
    cogl_program_set_uniform_float
    cogl_program_set_uniform_matrix
2010-08-12 16:50:46 +01:00
Robert Bragg
65196a4a9b cogl: Allow setting ARBfp source on a CoglShader
This makes CoglProgram/Shader automatically detect when the user has
given an ARBfp program by checking for "!!ARBfp1.0" at the beginning of
the user's source.

ARBfp local parameters can be set with cogl_program_uniform_float
assuming you pass a @size of 4 (all ARBfp program.local parameters
are vectors of 4 floats).

This doesn't expose ARBfp environment parameters or double precision
local parameters.
2010-08-09 17:27:02 +01:00
Robert Bragg
11045c724c cogl: Adds a COGL_FEATURE_SHADERS_ARBFP feature flag
This adds a public feature flag for ARBfp so developers can determine if
the cogl API supports ARBfp or not.
2010-08-09 17:27:02 +01:00
Robert Bragg
99ae7b15f5 cogl-program: gles2: bind programs lazily as for GL
This makes the gles2 cogl_program_use consistent with the GL version by
not binding the program immediately and instead leaving it to
cogl-material.c to bind the program when actually drawing something.
2010-08-03 15:00:07 +01:00
Robert Bragg
650df3f2eb gles2: Have CoglProgram track uniforms per program
Previously custom uniforms were tracked in _CoglGles2Wrapper but as part
of a process to consolidate the gl/gles2 shader code it seems to make
sense for this state to be tracked in the CoglProgram object instead.

http://bugzilla.o-hand.com/show_bug.cgi?id=2179
2010-08-03 15:00:04 +01:00
Robert Bragg
7705469d2b cogl-shader: unifies the driver/{gl,gles} shader files
The per driver implementations of cogl-shader.c had become almost
identical we now have a single cogl/cogl-shader.c instead.
2010-08-03 12:41:37 +01:00
Robert Bragg
6e176f94fa cogl-shader: Store the CoglShaderType in CoglShader
Instead of having to query GL and translate the GL enum into a
CoglShaderType each time cogl_shader_get_type is called we now keep
track of the type in CoglShader.
2010-08-03 12:41:34 +01:00
Neil Roberts
a2c2797105 gles/cogl-shader.c: Store the shader type in CoglShader
Nothing was storing the shader type when a shader was created so it
would get confused about whether it was a custom vertex or fragment
shader.

Also the 'type' member of CoglShader was a GLenum but the only place
that read it was treating it as if it was CoglShaderType. This changes
it be CoglShaderType.
2010-07-22 22:22:23 +01:00
Neil Roberts
023510636c Plug the leaking CoglProgram and CoglShader
_cogl_program_free and _cogl_shader_free never freed the struct their
structs so it would end up leaking a little bit.
2010-07-22 21:51:43 +01:00
Neil Roberts
4eca571a32 Add an internal _cogl_bitmap_new_from_buffer
This function creates a CoglBitmap which internally references a
CoglBuffer. The map and unmap functions will divert to mapping the
buffer. There are also now bind and unbind functions which should be
used instead of map and unmap whenever the data doesn't need to be
read from the CPU but will instead be passed to GL for packing or
unpacking. For bitmaps created from buffers this just binds the
bitmap.

cogl_texture_new_from_buffer now just uses this function to wrap the
buffer in a bitmap rather than trying to bind the buffer
immediately. This means that the buffer will be bound only at the
point right before the texture data is uploaded.

This approach means that using a pixel array will take the fastest
upload route if possible, but can still fallback to copying the data
by mapping the buffer if some conversion is needed. Previously it
would just crash in this case because the texture functions were all
passed a NULL pointer.

http://bugzilla.clutter-project.org/show_bug.cgi?id=2112
2010-07-15 17:27:15 +01:00
Neil Roberts
ccc3068ffd cogl-bitmap: Encapsulate the CoglBitmap even internally
The CoglBitmap struct is now only defined within cogl-bitmap.c so that
all of its members can now only be accessed with accessor
functions. To get to the data pointer for the bitmap image you must
first call _cogl_bitmap_map and later call _cogl_bitmap_unmap. The map
function takes the same arguments as cogl_pixel_array_map so that
eventually we can make a bitmap optionally internally divert to a
pixel array.

There is a _cogl_bitmap_new_from_data function which constructs a new
bitmap object and takes ownership of the data pointer. The function
gets passed a destroy callback which gets called when the bitmap is
freed. This is similar to how gdk_pixbuf_new_from_data
works. Alternatively NULL can be passed for the destroy function which
means that the caller will manage the life of the pointer (but must
guarantee that it stays alive at least until the bitmap is
freed). This mechanism is used instead of the old approach of creating
a CoglBitmap struct on the stack and manually filling in the
members. It could also later be used to create a CoglBitmap that owns
a GdkPixbuf ref so that we don't necessarily have to copy the
GdkPixbuf data when converting to a bitmap.

There is also _cogl_bitmap_new_shared. This creates a bitmap using a
reference to another CoglBitmap for the data. This is a bit of a hack
but it is needed by the atlas texture backend which wants to divert
the set_region virtual to another texture but it needs to override the
format of the bitmap to ignore the premult flag.
2010-07-15 17:24:01 +01:00
Neil Roberts
7d269c6315 gles/cogl-texture-driver.c: Fix the include for cogl-material-private
In ddb9016be4 the GL texture driver backend was changed to include
cogl-material-opengl-private.h instead of cogl-material-private.h.
However the gles texture backend was missed from this so it was giving
a compiler warning about using an undeclared function.
2010-07-14 17:49:16 +01:00
Neil Roberts
00e3d77be3 cogl-texture-3d: Use glTexSubImage3D through an indirect pointer
glTexSubImage3D was being called directly in cogl-texture-3d.c but the
function is only available since GL version 1.2 so on Windows it won't
be possible to directly link to it. Also under GLES it is only
available conditionally in an extension.
2010-07-14 17:45:15 +01:00
Robert Bragg
96b0e6c304 material: splits out all the state flushing code
This moves the code supporting _cogl_material_flush_gl_state into
cogl-material-opengl.c as part of an effort to reduce the size of
cogl-material.c to keep it manageable.
2010-07-13 19:26:58 +01:00
Robert Bragg
5442e429ba material: split the texture unit management out
In general cogl-material.c has become far to large to manage in one
source file. As one of the ways to try and break it down this patch
starts to move some of lower level texture unit state management out
into cogl-material-opengl.c. The naming is such because the plan is to
follow up and migrate the very GL specific state flushing code into the
same file.
2010-07-13 19:26:58 +01:00
Neil Roberts
5288f6d88d Add a Cogl texture 3D backend
This adds a publicly exposed experimental API for a 3D texture
backend. There is a feature flag which can be checked for whether 3D
textures are supported. Although we require OpenGL 1.2 which has 3D
textures in core, GLES only provides them through an extension so the
feature can be used to detect that.

The textures can be created with one of two new API functions :-

cogl_texture_3d_new_with_size

 and

cogl_texture_3d_new_from_data

There is also internally a new_from_bitmap function. new_from_data is
implemented in terms of this function.

The two constructors are effectively the only way to upload data to a
3D texture. It does not work to call glTexImage2D with the
GL_TEXTURE_3D target so the virtual for cogl_texture_set_region does
nothing. It would be possible to make cogl_texture_get_data do
something sensible like returning all of the images as a single long
image but this is not currently implemented and instead the virtual
just always fails. We may want to add API specific to the 3D texture
backend to get and set a sub region of the texture.

All of those three functions can throw a GError. This will happen if
the GPU does not support 3D textures or it does not support NPOTs and
an NPOT size is requested. It will also fail if the FBO extension is
not supported and the COGL_TEXTURE_NO_AUTO_MIPMAP flag is not
given. This could be avoided by copying the code for the
GL_GENERATE_MIPMAP TexParameter fallback, but in the interests of
keeping the code simple this is not yet done.

This adds a couple of functions to cogl-texture-driver for uploading
3D data and querying the 3D proxy
texture. prep_gl_for_pixels_upload_full now also takes sets the
GL_UNPACK_IMAGE_HEIGHT parameter so that 3D textures can have padding
between the images. Whenever 3D texture is uploading, both the height
of the images and the height of all of the data is specified (either
explicitly or implicilty from the CoglBitmap) so that the image height
can be deduced by dividing by the depth.
2010-07-13 14:28:52 +01:00
Neil Roberts
ccd45fc723 cogl-gles2-wrapper: Layers aren't equal if one is enabled and one is not
Previously when comparing whether the settings for a layer are equal
it would only check if one of them was enabled. If so then it would
assume the other one was enabled and continue to compare the texture
environment. Now it also checks whether the enabledness differs.
2010-07-13 14:28:35 +01:00
Neil Roberts
044523db26 Add the deprecated ref-counting for cogl_program
cogl_program has always had cogl_program_ref and cogl_program_unref
but this was missed from 89cb325fd4 so they got removed.
2010-07-09 19:09:49 +01:00
Neil Roberts
b25035ad2d cogl: Don't define the deprecated ref/unref accessors for new types
Previously COGL_OBJECT_DEFINE would always define deprecated
cogl_$type_{ref,unref} functions even if the type is new or if the
type is entirely internal. An application would still find it
difficult to use these because they wouldn't be in the headers, but it
still looks bad that they are exported from the shared library. This
patch changes it so that the deprecated ref counting functions are
defined using a separate macro and only the types that have these
functions in the headers call this macro.
2010-07-09 18:57:54 +01:00
Neil Roberts
bf8384baf1 Use GL_MAX_TEXTURE_SIZE on GLES when checking supported tex size
Under big GL, _cogl_texture_driver_size_supported uses the proxy
texture to check whether the given texture size is supported. Proxy
textures aren't available under GLES so previously this would just
return TRUE to assume all texture sizes are supported. This patch
makes it use glGetIntegerv with GL_MAX_TEXTURE_SIZE to give a second
best guess.

This fixes the sliced texture backend so that it will use slices when
the texture is too big.
2010-07-09 11:14:15 +01:00
Neil Roberts
da3be3df6b cogl-material: Add support for point sprites
This adds a new API call to enable point sprite coordinate generation
for a material layer:

void
cogl_material_set_layer_point_sprite_coords_enabled (CoglHandle material,
                                                     int layer_index,
                                                     gboolean enable);

There is also a corresponding get function.

Enabling point sprite coords simply sets the GL_COORD_REPLACE of the
GL_POINT_SPRITE glTexEnv when flusing the material. There is no
separate application control for glEnable(GL_POINT_SPRITE). Instead it
is left permanently enabled under the assumption that it has no affect
unless GL_COORD_REPLACE is enabled for a texture unit.

http://bugzilla.openedhand.com/show_bug.cgi?id=2047
2010-07-08 16:34:30 +01:00
Neil Roberts
06b58baa10 cogl-material: Add a property for setting the point size
This adds cogl_material_{get,set}_point_size. If the point size is not
1.0f then glPointSize will be called when the material is flushed.

http://bugzilla.openedhand.com/show_bug.cgi?id=2047
2010-07-08 16:34:30 +01:00
Robert Bragg
7571cc1923 cogl: expose the semantic differences of gl/gles2 npot textures
This adds three new feature flags COGL_FEATURE_TEXTURE_NPOT_BASIC,
COGL_FEATURE_TEXTURE_NPOT_MIPMAP and COGL_FEATURE_TEXTURE_NPOT_REPEAT
that can tell you if your hardware supports non power of two textures,
npot textures + mipmaps and npot textures + wrap modes other than
CLAMP_TO_EDGE.

The pre-existing COGL_FEATURE_TEXTURE_NPOT feature implies all of the
above.

By default GLES 2 core supports npot textures but mipmaps and repeat
modes can only be used with power of two textures. This patch also makes
GLES check for the GL_OES_texture_npot extension to determine if mipmaps
and repeating are supported with npot textures.
2010-07-07 13:26:41 +01:00
Neil Roberts
e33a94bff4 cogl: Remove cogl-defines.h.in from the driver make files
Commit 7fae8ac051 changed cogl-defines.h.in so there is only a
single copy in clutter/cogl/ instead of one for each driver. However
the old files were still mentioned in the EXTRA_DIST of the
Makefile.am so make distcheck was failing.
2010-06-23 17:44:09 +01:00
Neil Roberts
9d0962098f cogl-defines.h: Add a COGL_HAS_X11 define
This will be defined in cogl-defines.h whenever Cogl is built using a
winsys that supports X11. This implies CoglTexturePixmapX11 will be
available.

To make this work the two separate cogl-defines.h.in files have been
merged into one. The configure script now makes a @COGL_DEFINES@
substitution variable which contains the #define lines to put in
rather than directly having them in the seperate files.
2010-06-22 12:22:47 +01:00
Neil Roberts
31b5beb2c0 cogl: Add the infrastructure for checking for winsys extensions
This adds the framework needed to check for winsys specific extensions
(such as GLX extensions) using a similar mechanism to the
cogl-feature-functions header. There is a separate
cogl-winsys-feature-functions header which will contain macros to list
the extensions and functions. cogl_create_context_winsys now calls
_cogl_feature_check for each of these functions. _cogl_feature_check
has had to be changed to accept the driver prefix as the first
parameter so that it can prepend "GLX" rather than "GL" in this case.
2010-06-22 12:22:43 +01:00
Neil Roberts
9a1aa08fda cogl: Add an internal CoglTextureRectangle backend
This adds an internal rectangle texture backend which is mostly based
on the CoglTexture2D backend. It will throw assert failures if any
operations are attempted that rectangle textures don't support, such
as mipmapping or hardware repeating.
2010-06-22 11:47:33 +01:00
Neil Roberts
5a5b3914ba cogl: Fix the include path in driver/*/Makefile.am
The include path for the winsys and driver folder was given relative
to $(srcdir) so it would end up relative to the driver folder which is
wrong. It is now specified as $(srcdir)/../../winsys to get the right
location. The driver folder is removed because it is actually just
$(srcdir) and that is already included.
2010-06-22 11:47:32 +01:00
Neil Roberts
cc7722389c cogl-program: Add cogl_program_uniform_1i to GLES
The GLES 1.1 backend was missing a stub for cogl_program_uniform_1i.
2010-06-11 16:06:31 +01:00
Neil Roberts
9343cb849a cogl-gles2: Prefix internal GLES 2 wrapper symbols with _
Some internal symbols used for the GLES 2 wrapper were accidentally
being exported. This prepends an underscore to them so they won't
appear in the shared library.
2010-06-11 16:06:31 +01:00
Emmanuele Bassi
7a7dedebd5 cogl-framebuffer: Use the FBO extension for color sizes
OpenGL 3.0 deprecated querying of the GL_{RED,GREEN,BLUE}_BITS
constants, and the FBO extension provides a mechanism to query for the
color buffer sizes which *should* work even with the default
framebuffer. Unfortunately, this doesn't seem to hold for Mesa - so we
just use this for the offscreen CoglFramebuffer type, and we fall back
to glGetIntegerv() for the onscreen one.

http://bugzilla.openedhand.com/show_bug.cgi?id=2094
2010-06-10 19:53:39 +01:00
Robert Bragg
82e80e6765 material: Avoid redundant glBindTexture calls
This adds a _cogl_bind_gl_texture_transient function that should be used
instead of glBindTexture so we can have a consistent cache of the
textures bound to each texture unit so we can avoid some redundant
binding.
2010-06-09 17:26:15 +01:00
Robert Bragg
acc44161c1 material: Adds backend abstraction for fragment processing
As part of an effort to improve the architecture of CoglMaterial
internally this overhauls how we flush layer state to OpenGL by adding a
formal backend abstraction for fragment processing and further
formalizing the CoglTextureUnit abstraction.

There are three backends: "glsl", "arbfp" and "fixed". The fixed backend
uses the OpenGL fixed function APIs to setup the fragment processing,
the arbfp backend uses code generation to handle fragment processing
using an ARBfp program, and the GLSL backend is currently only there as
a formality to handle user programs associated with a material. (i.e.
the glsl backend doesn't yet support code generation)

The GLSL backend has highest precedence, then arbfp and finally the
fixed. If a backend can't support some particular CoglMaterial feature
then it will fallback to the next backend.

This adds three new COGL_DEBUG options:
* "disable-texturing" as expected should disable all texturing
* "disable-arbfp" always make the arbfp backend fallback
* "disable-glsl" always make the glsl backend fallback
* "show-source" show code generated by the arbfp/glsl backends
2010-06-09 17:15:59 +01:00
Damien Lespiau
56dd71dba0 cogl: Introduce private feature flags and check for ARB_fp
The Cogl context has now a feature_flags_private enum that will allow us
to query and use OpenGL features without exposing them in the public
API.

The ARB_fragment_program extension is the first user of those flags.
Looking for this extension only happens in the gl driver as the gles
drivers will not expose them.

One can use _cogl_features_available_private() to check for the
availability of such private features.

While at it, reindent cogl-internal.h as described in CODING_STYLE.
2010-06-09 15:19:30 +01:00
Neil Roberts
8836c868a4 cogl-gles2-wrapper: Fix some cases using the wrong texture unit
At two places in cogl_wrap_prepare_for_draw it was trying to loop over
the texture units to flush some state. However it was retrieving the
texture unit pointer using w->active_texture_unit instead of the loop
index so it would end up with the wrong state.

Also in glEnableClientState it was using the active unit instead of
the client active unit.
2010-06-08 17:26:26 +01:00
Damien Lespiau
58b0028b52 analysis: FALSE/0 used in pointer context
While this is totally fine (0 in the pointer context will be converted
in the right internal NULL representation, which could be a value with
some bits to 1), I believe it's clearer to use NULL in the pointer
context.

It seems that, in most case, it's more an overlook than a deliberate
choice to use FALSE/0 as NULL, eg. copying a _COGL_GET_CONTEXT (ctx, 0)
or a g_return_val_if_fail (cond, 0) from a function returning a
gboolean.
2010-06-01 12:08:18 +01:00
Neil Roberts
36298bbe30 gles: Fix the functions names for the GL_OES_framebuffer_object ext
In 91cde78a7 I accidentally changed the function names that get looked
up for the framebuffer extension under GLES so that they didn't have
any suffix. The spec for extension specifies that they should have the
OES suffix.
2010-05-05 12:24:11 +01:00
Emmanuele Bassi
72f4ddf532 Remove mentions of the FSF address
Since using addresses that might change is something that finally
the FSF acknowledge as a plausible scenario (after changing address
twice), the license blurb in the source files should use the URI
for getting the license in case the library did not come with it.

Not that URIs cannot possibly change, but at least it's easier to
set up a redirection at the same place.

As a side note: this commit closes the oldes bug in Clutter's bug
report tool.

http://bugzilla.openedhand.com/show_bug.cgi?id=521
2010-03-01 12:56:10 +00:00
Neil Roberts
82fd07c54a cogl-vertex-buffer: Add support for unsigned int indices
This adds a COGL_INDICES_TYPE_UNSIGNED_INT enum value so that unsigned
ints can be used with cogl_vertex_buffer_indices_new.  Unsigned ints
are not supported in core on GLES so a feature flag has also been
added to advertise this. GLES only sets the feature if the
GL_OES_element_index_uint extension is available. It is an error to
call indices_new() with unsigned ints unless the feature is
advertised.

http://bugzilla.openedhand.com/show_bug.cgi?id=1998
2010-02-26 10:56:35 +00:00
Neil Roberts
b583083a3f gles2: Remove the special wrapper for glBindTexture
Previously the GLES2 backend needed a special wrapper for
glBindTexture because it needed to know the internal GL format of the
texture in order to correctly implement the GL_MODULATE texture env
mode. When GL_MODULATE is used then the RGB values are taken from the
previous texture layer rather than being fetched from the
texture. However since the material API was added Cogl no longer uses
the GL_MODULATE texture env mode but instead always uses GL_COMBINE.

Compiling the GLES2 backend broke since the more-texture-backends
branch merge because the cogl_get_internal_gl_format function was
removed and there was one place in GLES2 specific code that was using
this to bind the texture.
2010-02-25 12:50:52 +00:00
Neil Roberts
cb7a99ac69 cogl-gles2-wrapper: Add support for the layer combine operations
The texture layer combine functions are now hard coded to GL_COMBINE
instead of GL_MODULATE. The combine function can be customized with
all the parameters of GL_COMBINE. A shader is generated to implement
the given parameters.

Currently it will try to generate code for the constant color but it
will use a uniform which does not exist.
2010-02-25 12:50:52 +00:00
Neil Roberts
7dce5d9372 gles2: Implement a wrapper for glGetIntegerv(GL_MAX_TEXTURE_UNITS)
The GLES2 backend for Cogl is failing to compile because
GL_MAX_TEXTURE_UNITS is not defined. Let's define it and provide a
wrapper which uses GL_MAX_TEXTURE_IMAGE_UNITS or
COGL_GLES2_MAX_TEXTURE_UNITS, whichever is the smallest.
2010-02-25 12:50:52 +00:00
Robert Bragg
ba4b00be42 cogl: remove redundant _cogl_journal_flush prototype
There was a redundant _cogl_journal_flush function prototype in
cogl-primitives.h
2010-02-12 14:05:01 +00:00
Robert Bragg
0f5f4e8645 cogl: improves header and coding style consistency
We've had complaints that our Cogl code/headers are a bit "special" so
this is a first pass at tidying things up by giving them some
consistency. These changes are all consistent with how new code in Cogl
is being written, but the style isn't consistently applied across all
code yet.

There are two parts to this patch; but since each one required a large
amount of effort to maintain tidy indenting it made sense to combine the
changes to reduce the time spent re indenting the same lines.

The first change is to use a consistent style for declaring function
prototypes in headers. Cogl headers now consistently use this style for
prototypes:

 return_type
 cogl_function_name (CoglType arg0,
                     CoglType arg1);

Not everyone likes this style, but it seems that most of the currently
active Cogl developers agree on it.

The second change is to constrain the use of redundant glib data types
in Cogl. Uses of gint, guint, gfloat, glong, gulong and gchar have all
been replaced with int, unsigned int, float, long, unsigned long and char
respectively. When talking about pixel data; use of guchar has been
replaced with guint8, otherwise unsigned char can be used.

The glib types that we continue to use for portability are gboolean,
gint{8,16,32,64}, guint{8,16,32,64} and gsize.

The general intention is that Cogl should look palatable to the widest
range of C programmers including those outside the Gnome community so
- especially for the public API - we want to minimize the number of
foreign looking typedefs.
2010-02-12 14:05:00 +00:00
Robert Bragg
10fa7c7ce9 cogl: deprecates cogl_check_extension
OpenGL is an implementation detail for Cogl so it's not appropriate to
expose OpenGL extensions through the Cogl API.

Note: Clutter is currently still using this API, because it is still
doing raw GL calls in ClutterGLXTexturePixmap, so this introduces a
couple of (legitimate) build warnings while compiling Clutter.
2010-02-12 14:05:00 +00:00
Damien Lespiau
ca80e8802b cogl-pixel-buffer: Add a fallback path
First, let's add a new public feature called, surprisingly,
COGL_FEATURE_PBOS to check the availability of PBOs and provide a
fallback path when running on older GL implementations or on OpenGL ES

In case the underlying OpenGL implementation does not provide PBOs, we
need a fallback path (a malloc'ed buffer). The CoglPixelBufer
constructors will instanciate a subclass of CoglBuffer that handles
map/unmap and set_data() with a malloc'ed buffer.

The public feature is useful to check before using set_data() on a
buffer as it will mean doing a memcpy() when not supporting PBOs (in
that case, it's better to create the texture directly instead of using a
CoglBuffer).
2010-02-08 17:14:49 +00:00
Damien Lespiau
dbef77cd8b cogl: new textures sould have GL_TEXTURE_MIN_FILTER set to GL_LINEAR
The only way the user has to set the mipmap filters is through the
material/layer API. This API defaults to GL_LINEAR/GL_LINEAR for the max
and min filters. With the main use case of cogl being 2D interfaces, it
makes sense do default to GL_LINEAR for the min filter.

When creating new textures, we did not set any filter on them, using
OpenGL defaults': GL_NEAREST_MIPMAP_LINEAR for the min filter and
GL_LINEAR for the max filter. This will make the driver allocate memory
for the mipmap tree, memory that will not be used in the nominal case
(as the material API defaults to GL_LINEAR).

This patch tries to ensure that the min filter is set to GL_LINEAR
before any glTexImage*() call is done on the texture by setting the
filter when generating new OpenGL handles.
2010-02-08 17:14:49 +00:00
Neil Roberts
f5d809f1e8 Merge branch 'master' into more-texture-backends 2010-01-15 12:15:46 +00:00
Neil Roberts
dfc3dd9c43 cogl: Remove the CGL_* defines
These macros used to define Cogl wrappers for the GLenum values. There are
now Cogl enums everywhere in the API where these were required so we
shouldn't need them anymore. They were in the public headers but as
they are not neccessary and were not in the API docs for Clutter 1.0
it should be safe to remove them.
2010-01-12 17:10:15 +00:00
Neil Roberts
f17767e4c1 cogl: Add _cogl_texture_driver_upload_to_gl
This provides a way to upload the entire data for a texture without
having to first call glTexImage and then glTexSubImage. This should be
faster especially with indirect rendering where it would needlessy
send the data for the texture twice.
2009-12-02 22:03:26 +00:00
Neil Roberts
5030356e0e cogl: Move data only used for upload out of CoglTexture
The CoglTexture struct previously contained some fields which are only
used to upload data such as the CoglBitmap and the source GL
format. These are now moved to a separate CoglTextureUploadData struct
which only exists for the duration of one of the cogl_texture_*_new
functions. In cogl-texture there are utility functions which operate
on this new struct rather than on CoglTexture directly.

Some of the fields that were previously stored in the CoglBitmap
struct are now copied to the CoglTexture such as the width, height,
format and internal GL format.

The rowstride was previously stored in CoglTexture and this was
publicly accessible with the cogl_texture_get_rowstride
function. However this doesn't seem to be a useful function because
there is no need to use the same rowstride again when uploading or
downloading new data. Instead cogl_texture_get_rowstride now just
calculates a suitable rowstride from the format and width of the
texture.
2009-12-02 22:03:07 +00:00
Robert Bragg
78fb882a4b [cogl] remove unused gles/cogl-utils.[c,h]
The only function in gles/cogl-utils.c was cogl_util_next_p2() and it's
redundant since we also have a cogl/cogl-utils.[c,h]
2009-11-24 17:58:22 +00:00
Neil Roberts
b4fc8faaab cogl: Use APIENTRY for GL function pointer declarations
This matters for platforms such as Windows that use a different
calling covention from the default for GL functions.
2009-11-18 19:24:09 +00:00
Emmanuele Bassi
7372e1d4f9 build: Add cogl-feature-functions.h to the dist 2009-11-18 14:43:46 +00:00
Neil Roberts
0e112c3371 cogl: Add the missing terminators for the arrays of feature functions
_cogl_feature_check expects the array of function names to be
terminated with a NULL pointer but I forgot to add this. This was
causing crashes depending on what happened to be in memory after the
array.
2009-11-18 13:23:10 +00:00