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Adds initial GLES2 integration support

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This makes it possible to integrate existing GLES2 code with
applications using Cogl as the rendering api.

Currently all GLES2 usage is handled with separate GLES2 contexts to
ensure that GLES2 api usage doesn't interfere with Cogl's own use of
OpenGL[ES]. The api has been designed though so we can provide tighter
integration later.

The api would allow us to support GLES2 virtualized on top of an
OpenGL/GLX driver as well as GLES2 virtualized on the core rendering api
of Cogl itself. Virtualizing the GLES2 support on Cogl will allow us to
take advantage of Cogl debugging facilities as well as let us optimize
the cost of allocating multiple GLES2 contexts and switching between
them which can both be very expensive with many drivers.

As as a side effect of this patch Cogl can also now be used as a
portable window system binding API for GLES2 as an alternative to EGL.

Parts of this patch are based on work done by Tomeu Vizoso
<tomeu.vizoso@collabora.com> who did the first iteration of adding GLES2
API support to Cogl so that WebGL support could be added to
webkit-clutter.

This patch adds a very minimal cogl-gles2-context example that shows how
to create a gles2 context, clear the screen to a random color and also
draw a triangle with the cogl api.

Reviewed-by: Neil Roberts <neil@linux.intel.com>
(cherry picked from commit 4bb6eff3dbd50d8fef7d6bdbed55c5aaa70036a8)
This commit is contained in:
Robert Bragg
2012-03-06 03:21:30 +00:00
parent f729798f03
commit 010d16f647
23 changed files with 2171 additions and 194 deletions
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33
cogl/cogl-framebuffer-private.h
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@ -166,17 +166,33 @@ struct _CoglFramebuffer
CoglBool clear_clip_dirty;
};
typedef enum {
COGL_OFFSCREEN_ALLOCATE_FLAG_DEPTH_STENCIL = 1L<<0,
COGL_OFFSCREEN_ALLOCATE_FLAG_DEPTH24_STENCIL8 = 1L<<1,
COGL_OFFSCREEN_ALLOCATE_FLAG_DEPTH = 1L<<2,
COGL_OFFSCREEN_ALLOCATE_FLAG_STENCIL = 1L<<3
} CoglOffscreenAllocateFlags;
typedef struct _CoglGLFramebuffer
{
GLuint fbo_handle;
GList *renderbuffers;
int samples_per_pixel;
} CoglGLFramebuffer;
struct _CoglOffscreen
{
CoglFramebuffer _parent;
GLuint fbo_handle;
GSList *renderbuffers;
CoglGLFramebuffer gl_framebuffer;
CoglTexture *texture;
int texture_level;
int texture_level_width;
int texture_level_height;
CoglOffscreenAllocateFlags allocation_flags;
/* FIXME: _cogl_offscreen_new_to_texture_full should be made to use
* fb->config to configure if we want a depth or stencil buffer so
* we can get rid of these flags */
@ -400,4 +416,17 @@ _cogl_framebuffer_draw_indexed_attributes (CoglFramebuffer *framebuffer,
int n_attributes,
CoglDrawFlags flags);
gboolean
_cogl_framebuffer_try_creating_gl_fbo (CoglContext *ctx,
CoglTexture *texture,
int texture_level,
int texture_level_width,
int texture_level_height,
CoglFramebufferConfig *config,
CoglOffscreenAllocateFlags flags,
CoglGLFramebuffer *gl_framebuffer);
void
_cogl_gl_framebuffer_bind (CoglFramebuffer *framebuffer, GLenum target);
#endif /* __COGL_FRAMEBUFFER_PRIVATE_H */