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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. |
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| .. | ||
| cogl-context-driver-gles.c | ||
| cogl-context-driver-gles.h | ||
| cogl-feature-functions-gles.h | ||
| cogl-fixed-vertex-shader.glsl | ||
| cogl-gles2-wrapper.c | ||
| cogl-gles2-wrapper.h | ||
| cogl-gles.c | ||
| cogl-texture-driver-gles.c | ||