This is just a hack. After we convert the 3D texcoord into a face plus 2D
texcoord we need to recompute the partial derivatives and mipmap LOD.
But we don't have the info to do that. Adjusting the original mipmap
level by -1 seems to give somewhat better results than before though.
This new generic transform replaces "special" instructions by more generic
variants. Hopefully, we will be able to share this code between r300 and r500.
Since ARB_fragment_program and friends are defined to ignore the setting of
the GL_TEXTURE_COMPARE_FUNC parameter, we have to explicitly enable the
shadow comparison by marking the texture unit in ShadowSamplers when
appropriate.
Streamlining source and destination registers, as well as texcoord scaling for
RECT textures is now done in a radeon_program based transformation.
The idea is that this will allow us to optimize away unnecessary indirections
more easily.
The idea/hope is that radeon_program will serve as an intermediate
representation for r3xx up to r6xx fragment and vertex programs.
Right now, it is nothing more than a simplistic wrapper around Mesa's
prog_instruction, together with the notion of clauses, taken from r6xx docs.
The clauses will eventually be used to represent the nodes that are used in
r300 family fragment programs.
Refactor so that r300_pfs_compile_state "owns"/holds a pointer to
r300_fragment_program instead of the other way round. This is more natural from
an object orientation point of view.
Move the compiled hardware state into r300_fragment_program_code, in
anticipation of on-the-fly program recompilation based on external OpenGL
state.
r500 code still used r300_pfs_compile_state, which contains some fields that
really only make sense on r3xx type hardware. In order to allow both fragprog
implementations to go forward without disturbing each other, I've pushed this
structure down into the respective r[3|5]00_fragprog.c
caveats:
- does not work with old (i.e. libGLcore) xserver:
- made unbindContext a noop
- extensions:
GLX_SGI_make_current_read
GLX_EXT_texture_from_pixmap
GLX_MESA_copy_sub_buffer
This is for loading swrast_dri.so from libGL.
MakeContextCurrent() seems to unbind the context right after binding it and
DRI drivers also have a noop DriverAPI.UnbindContext ...
