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/* surface / context tracking */
/*
context A:
render to texture T
context B:
texture from T
-----------------------
flush surface:
which contexts are bound to the surface?
-----------------------
glTexSubImage():
which contexts need to be flushed?
*/
/*
in MakeCurrent():
call sct_bind_surfaces(context, list of surfaces) to update the
dependencies between context and surfaces
in SurfaceFlush(), or whatever it is in D3D:
call sct_get_surface_contexts(surface) to get a list of contexts
which are currently bound to the surface.
in BindTexture():
call sct_bind_texture(context, texture) to indicate that the texture
is used in the scene.
in glTexSubImage() or RenderToTexture():
call sct_is_texture_used(context, texture) to determine if the texture
has been used in the scene, but the scene's not flushed. If TRUE is
returned it means the scene has to be rendered/flushed before the contents
of the texture can be changed.
in psb_scene_flush/terminate():
call sct_flush_textures(context) to tell the SCT that the textures which
were used in the scene can be released.
*/
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