Re-implement GLSL texture sampler variables.

GLSL sampler variables indicate which texture unit to use for TEX instructions.
Previously, this was baked into the fragment/vertex program and couldn't be
readily changed once set.
Now, SamplerUnits[] array indicates which texture unit is to be used for
each sampler variable.  These values are set with glUniform1i().
This is extra state that must be passed to the fragment/vertex program
executor at runtime.

2 files changed, 5 insertions, 1 deletions

diff --git a/src/mesa/pipe/tgsi/exec/tgsi_exec.c b/src/mesa/pipe/tgsi/exec/tgsi_exec.c
index 0125f40dd22..66a81b4bd83 100644
--- a/src/mesa/pipe/tgsi/exec/tgsi_exec.c
+++ b/src/mesa/pipe/tgsi/exec/tgsi_exec.c
@@ -1219,11 +1219,14 @@ exec_tex(struct tgsi_exec_machine *mach,
          const struct tgsi_full_instruction *inst,
          boolean biasLod)
 {
-   const uint unit = inst->FullSrcRegisters[1].SrcRegister.Index;
+   const uint sampler = inst->FullSrcRegisters[1].SrcRegister.Index;
+   const uint unit = mach->SamplerUnits[sampler];
    union tgsi_exec_channel r[8];
    uint chan_index;
    float lodBias;
 
+   //   printf("Sampler %u unit %u\n", sampler, unit);
+
    switch (inst->InstructionExtTexture.Texture) {
    case TGSI_TEXTURE_1D:
 
diff --git a/src/mesa/pipe/tgsi/exec/tgsi_exec.h b/src/mesa/pipe/tgsi/exec/tgsi_exec.h
index 1805e724874..38f9218520e 100644
--- a/src/mesa/pipe/tgsi/exec/tgsi_exec.h
+++ b/src/mesa/pipe/tgsi/exec/tgsi_exec.h
@@ -118,6 +118,7 @@ struct tgsi_exec_machine
    struct tgsi_exec_vector       *Temps;
    struct tgsi_exec_vector       *Addrs;
 
+   uint                          *SamplerUnits;
    struct tgsi_sampler           *Samplers;
 
    float                         Imms[TGSI_EXEC_NUM_IMMEDIATES][4];