Updated GLSL uniform/sampler handling from gallium-0.1 branch

Previously, the shader linker combined the uniforms used by the vertex and
fragment shaders into a combined set of uniforms.  This made the implementation
of glUniform*() simple, but was rather inefficient otherwise.  Now each shader
gets its own set of uniforms (no more modelview matrix showing up in the
fragment shader uniforms, for example).

cherry-picked by hand from gallium-0.1 branch

1 files changed, 5 insertions, 5 deletions

diff --git a/src/mesa/shader/slang/slang_codegen.c b/src/mesa/shader/slang/slang_codegen.c
index ebead3274e..88baf54d13 100644
--- a/src/mesa/shader/slang/slang_codegen.c
+++ b/src/mesa/shader/slang/slang_codegen.c
@@ -2836,14 +2836,14 @@ _slang_codegen_global_variable(slang_assemble_ctx *A, slang_variable *var,
    const GLint texIndex = sampler_to_texture_index(var->type.specifier.type);
 
    if (texIndex != -1) {
-      /* Texture sampler:
+      /* This is a texture sampler variable...
        * store->File = PROGRAM_SAMPLER
-       * store->Index = sampler uniform location
+       * store->Index = sampler number (0..7, typically)
        * store->Size = texture type index (1D, 2D, 3D, cube, etc)
        */
-      GLint samplerUniform
-         = _mesa_add_sampler(prog->Parameters, varName, datatype);
-      store = _slang_new_ir_storage(PROGRAM_SAMPLER, samplerUniform, texIndex);
+      const GLint sampNum = A->numSamplers++;
+      _mesa_add_sampler(prog->Parameters, varName, datatype, sampNum);
+      store = _slang_new_ir_storage(PROGRAM_SAMPLER, sampNum, texIndex);
       if (dbg) printf("SAMPLER ");
    }
    else if (var->type.qualifier == SLANG_QUAL_UNIFORM) {