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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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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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We need to do these initializations before initializing the Mesa context
because context init involves creating texture/program/etc objects.
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