+/**
+ * Return a pointer to the 4-element float vector specified by the given
+ * source register.
+ */
+static INLINE const GLfloat *
+get_register_pointer( GLcontext *ctx,
+ const struct fp_src_register *source,
+ const struct fp_machine *machine,
+ const struct fragment_program *program )
+{
+ const GLfloat *src;
+ switch (source->File) {
+ case PROGRAM_TEMPORARY:
+ ASSERT(source->Index < MAX_NV_FRAGMENT_PROGRAM_TEMPS);
+ src = machine->Temporaries[source->Index];
+ break;
+ case PROGRAM_INPUT:
+ ASSERT(source->Index < MAX_NV_FRAGMENT_PROGRAM_INPUTS);
+ src = machine->Inputs[source->Index];
+ break;
+ case PROGRAM_LOCAL_PARAM:
+ ASSERT(source->Index < MAX_PROGRAM_LOCAL_PARAMS);
+ src = program->Base.LocalParams[source->Index];
+ break;
+ case PROGRAM_ENV_PARAM:
+ ASSERT(source->Index < MAX_NV_FRAGMENT_PROGRAM_PARAMS);
+ src = ctx->FragmentProgram.Parameters[source->Index];
+ break;
+ case PROGRAM_NAMED_PARAM:
+ ASSERT(source->Index < (GLint) program->Parameters->NumParameters);
+ src = program->Parameters->Parameters[source->Index].Values;
+ break;
+ case PROGRAM_STATE_VAR:
+ src = NULL;
+ break;
+ default:
+ _mesa_problem(ctx, "Invalid input register file in fetch_vector4");
+ src = NULL;
+ }
+ return src;
+}
+