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fragment shaders
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needed
The default texture is used when the current fragment shader has texture
sample instructions but the user has not provided/bound a texture.
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Before, we were sometimes rendering into a stale texture because
st_finalize_texture() would discard the old texture and create a new one.
Moved st_update_framebuffer atom after texture validation so that we
can create a new renderbuffer surface if the texture changes.
Also, split texture validation into two parts: finalize_textures and
update_textures. Do finalize_textures first to avoid getting into the
situtation where we're doing a pipe->surface_copy() mid-way through
state validation.
Some debug code still in place, but disabled...
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Fixes problems with interleaved glTexImage and rendering calls.
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If we run out of texture memory we may not have the texture needed by the
fragment shader. If this happens, plug in a color passthrough shader.
So instead of crashing, we just don't see the texture.
GL_OUT_OF_MEMORY is raised, of course.
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update_samplers()
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st_atom_sampler.c
Otherwise, we were sometimes setting texture state but not the corresponding
sampler state.
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st_finalize_texture()'s return code now indicates success/fail instead of
presence of texture border (which we discard earlier).
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This provides better information about which images in texture object have changed.
Also, call texture_update() from more places previously missed.
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Bind all the samplers/textures at once rather than piecemeal.
This is easier for drivers to understand.
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This is a better fix for the previous check-in.
Fixes texadd.c conform test, and probably other bugs.
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The 'st' pointer might not have changed, but st->pt might have. The dirtyData flag
will indicate when that's happened, so check it.
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Called whenever texture data is changed (glTexImage, glTexSubImage,
glCopyTexSubImage, etc).
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Calling glTexSubImage() or glTexImage() to replace texture data didn't
reliably cause pipe->set_sampler_texture() to get called so drivers didn't
always get notified of new texture data.
The st_texture_object->pt pointer doesn't always indicate changed data so
added a dirtyData field.
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The effect of this mapping can be acheived by the state tracker and
setting up the pipe texture state pointers to incorporate its affects.
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pipe->get_tex_surface() has to be used for access to texture image data.
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