Neil Roberts e90ded6c23 cogl-atlas: Try 4 different approaches for migrating textures ... Instead of directly banging GL to migrate textures the atlas now uses the CoglFramebuffer API. It will use one of four approaches; it can set up two FBOs and use _cogl_blit_framebuffer to copy between them; it can use a single target fbo and then render the source texture to the FBO using a Cogl draw call; it can use a single FBO and call glCopyTexSubImage2D; or it can fallback to reading all of the texture data back to system memory and uploading it again with a sub texture update. Previously GL calls were used directly because Cogl wasn't able to create a framebuffer without a stencil and depth buffer. However there is now an internal version of cogl_offscreen_new_to_texture which takes a set of flags to disable the two buffers. The code for blitting has now been moved into a separate file called cogl-blit.c because it has become quite long and it may be useful outside of the atlas at some point. The 4 different methods have a fixed order of preference which is: * Texture render between two FBOs * glBlitFramebuffer * glCopyTexSubImage2D * glGetTexImage + glTexSubImage2D Once a method is succesfully used it is tried first for all subsequent blits. The default default can be overridden by setting the environment variable COGL_ATLAS_DEFAULT_BLIT_MODE to one of the following values: * texture-render * framebuffer * copy-tex-sub-image * get-tex-data		2011-02-15 12:10:54 +00:00
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cogl	cogl-atlas: Try 4 different approaches for migrating textures	2011-02-15 12:10:54 +00:00
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pango	Allow multiple CoglAtlases for textures	2010-12-13 18:59:41 +00:00
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