mesa: Determine GL_ACTIVE_ATTRIBUTES by walking the GLSL IR.

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

src/mesa/main/shader_query.cpp

@@ -185,3 +185,30 @@ _mesa_GetAttribLocationARB(GLhandleARB program, const GLcharARB * name)
 
    return -1;
 }
+
+
+unsigned
+_mesa_count_active_attribs(struct gl_shader_program *shProg)
+{
+   if (!shProg->LinkStatus
+       || shProg->_LinkedShaders[MESA_SHADER_VERTEX] == NULL) {
+      return 0;
+   }
+
+   exec_list *const ir = shProg->_LinkedShaders[MESA_SHADER_VERTEX]->ir;
+   unsigned i = 0;
+
+   foreach_list(node, ir) {
+      const ir_variable *const var = ((ir_instruction *) node)->as_variable();
+
+      if (var == NULL
+	  || var->mode != ir_var_in
+	  || var->location == -1
+	  || var->location < VERT_ATTRIB_GENERIC0)
+	 continue;
+
+      i++;
+   }
+
+   return i;
+}

src/mesa/main/shaderapi.c

@@ -569,7 +569,7 @@ get_programiv(struct gl_context *ctx, GLuint program, GLenum pname, GLint *param
       *params = shProg->NumShaders;
       break;
    case GL_ACTIVE_ATTRIBUTES:
-      *params = attribs ? attribs->NumParameters : 0;
+      *params = _mesa_count_active_attribs(shProg);
       break;
    case GL_ACTIVE_ATTRIBUTE_MAX_LENGTH:
       *params = _mesa_longest_parameter_name(attribs, PROGRAM_INPUT) + 1;

src/mesa/main/shaderapi.h

@@ -50,6 +50,8 @@ _mesa_active_program(struct gl_context *ctx, struct gl_shader_program *shProg,
 extern void
 _mesa_init_shader_dispatch(struct _glapi_table *exec);
 
+extern unsigned
+_mesa_count_active_attribs(struct gl_shader_program *shProg);
 
 
 extern void GLAPIENTRY