fix incorrect sampler numbering/indexing.

All samplers indexes were zero.

cherry-picked from master (b6fb0940c2)

src/mesa/shader/prog_parameter.c

@@ -283,25 +283,31 @@ _mesa_add_uniform(struct gl_program_parameter_list *paramList,
  * \param name  uniform's name
  * \param datatype  GL_SAMPLER_2D, GL_SAMPLER_2D_RECT_ARB, etc.
  * \param index  the sampler number (as seen in TEX instructions)
+ * \return  sampler index (starting at zero) or -1 if error
  */
 GLint
 _mesa_add_sampler(struct gl_program_parameter_list *paramList,
-                  const char *name, GLenum datatype, GLuint index)
+                  const char *name, GLenum datatype)
 {
    GLint i = _mesa_lookup_parameter_index(paramList, -1, name);
    if (i >= 0 && paramList->Parameters[i].Type == PROGRAM_SAMPLER) {
       ASSERT(paramList->Parameters[i].Size == 1);
       ASSERT(paramList->Parameters[i].DataType == datatype);
-      ASSERT(paramList->ParameterValues[i][0] == index);
       /* already in list */
-      return i;
+      return (GLint) paramList->ParameterValues[i][0];
    }
    else {
-      GLfloat indexf = index;
       const GLint size = 1; /* a sampler is basically a texture unit number */
-      i = _mesa_add_parameter(paramList, PROGRAM_SAMPLER, name,
-                              size, datatype, &indexf, NULL);
-      return i;
+      GLfloat value;
+      GLint numSamplers = 0;
+      for (i = 0; i < paramList->NumParameters; i++) {
+         if (paramList->Parameters[i].Type == PROGRAM_SAMPLER)
+            numSamplers++;
+      }
+      value = (GLfloat) numSamplers;
+      (void) _mesa_add_parameter(paramList, PROGRAM_SAMPLER, name,
+                                 size, datatype, &value, NULL);
+      return numSamplers;
    }
 }
 

src/mesa/shader/prog_parameter.h

@@ -114,7 +114,7 @@ _mesa_add_uniform(struct gl_program_parameter_list *paramList,
 
 extern GLint
 _mesa_add_sampler(struct gl_program_parameter_list *paramList,
-                  const char *name, GLenum datatype, GLuint index);
+                  const char *name, GLenum datatype);
 
 extern GLint
 _mesa_add_varying(struct gl_program_parameter_list *paramList,

src/mesa/shader/slang/slang_codegen.c

@@ -2841,8 +2841,7 @@ _slang_codegen_global_variable(slang_assemble_ctx *A, slang_variable *var,
        * store->Index = sampler number (0..7, typically)
        * store->Size = texture type index (1D, 2D, 3D, cube, etc)
        */
-      const GLint sampNum = A->numSamplers++;
-      _mesa_add_sampler(prog->Parameters, varName, datatype, sampNum);
+      GLint sampNum = _mesa_add_sampler(prog->Parameters, varName, datatype);
       store = _slang_new_ir_storage(PROGRAM_SAMPLER, sampNum, texIndex);
       if (dbg) printf("SAMPLER ");
    }

src/mesa/shader/slang/slang_compile.c

@@ -1620,7 +1620,6 @@ parse_init_declarator(slang_parse_ctx * C, slang_output_ctx * O,
       A.program = O->program;
       A.vartable = O->vartable;
       A.curFuncEndLabel = NULL;
-      A.numSamplers = 0;
       if (!_slang_codegen_global_variable(&A, var, C->type))
          return 0;
    }
@@ -1643,7 +1642,6 @@ parse_init_declarator(slang_parse_ctx * C, slang_output_ctx * O,
          A.space.funcs = O->funs;
          A.space.structs = O->structs;
          A.space.vars = O->vars;
-         A.numSamplers = 0;
          if (!initialize_global(&A, var))
             return 0;
       }
@@ -1777,7 +1775,6 @@ parse_function(slang_parse_ctx * C, slang_output_ctx * O, int definition,
       A.program = O->program;
       A.vartable = O->vartable;
       A.log = C->L;
-      A.numSamplers = 0;
 
       _slang_codegen_function(&A, *parsed_func_ret);
    }

src/mesa/shader/slang/slang_typeinfo.h

@@ -65,7 +65,6 @@ typedef struct slang_assemble_ctx_
    struct slang_label_ *curFuncEndLabel;
    struct slang_ir_node_ *CurLoop;
    struct slang_function_ *CurFunction;
-   GLuint numSamplers;
 } slang_assemble_ctx;