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texture image in the base internal format between user->Mesa format
conversion. See comments in texstore.c
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_mesa_base_texture_format()
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1. Added ctx->Driver.ChooseTextureFormat() function. Examines user's
internalFormat, format, type params and returns a gl_texture_format.
2. _mesa_store_teximage[123]d() calls ctx->Driver.ChooseTextureFormat(),
allocates storage and transfers the image into the desired format.
3. _mesa_transfer_teximage() now takes a gl_texture_format to describe
the destination format. Any combination of input format/type and
output gl_texture_format is accepted. Uses optimized _mesa_convert_-
texsubimage[123]d() functions when possible.
3. DRI driver's TexImage[123]D functions should be a lot simpler now.
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format into texImage->TexFormat, the rest is handled by core Mesa.
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FetchTexel routines).
- Initial hooks for GL_EXT_texture_filter_anisotropic.
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