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.

1 files changed, 11 insertions, 0 deletions

diff --git a/src/mesa/shader/prog_instruction.c b/src/mesa/shader/prog_instruction.c
index c84c76fd5bd..066129037a7 100644
--- a/src/mesa/shader/prog_instruction.c
+++ b/src/mesa/shader/prog_instruction.c
@@ -246,6 +246,17 @@ _mesa_num_inst_dst_regs(gl_inst_opcode opcode)
 }
 
 
+GLboolean
+_mesa_is_tex_instruction(gl_inst_opcode opcode)
+{
+   return (opcode == OPCODE_TEX ||
+           opcode == OPCODE_TXB ||
+           opcode == OPCODE_TXD ||
+           opcode == OPCODE_TXL ||
+           opcode == OPCODE_TXP);
+}
+
+
 /**
  * Return string name for given program opcode.
  */