matrix-stack: Adds a stack age counter

Sometimes it would be useful if we could efficiently track when a matrix
stack has been modified. For example on GLES2 we have to upload the
modelview as a uniform to our glsl programs but because the modelview
state is part of the framebuffer state it becomes a bit more tricky to
know when to re-sync the value of the uniform with the framebuffer
state. This adds an "age" counter to CoglMatrixStack which is
incremented for any operation that effectively modifies the top of the
stack so now we can save the age of the stack inside the pipeline
whenever we update modelview uniform and later compare that with the
stack to determine if it has changed.

clutter/cogl/cogl/cogl-matrix-stack.c

@@ -58,6 +58,8 @@ struct _CoglMatrixStack
   /* which state does GL have, NULL if unknown */
   CoglMatrixState *flushed_state;
   gboolean flushed_identity;
+
+  unsigned int age;
 };
 
 /* XXX: this doesn't initialize the matrix! */
@@ -138,6 +140,8 @@ _cogl_matrix_stack_new (void)
   _cogl_matrix_state_init (state);
   state->is_identity = TRUE;
 
+  stack->age = 0;
+
   return stack;
 }
 
@@ -185,6 +189,7 @@ _cogl_matrix_stack_pop (CoglMatrixStack *stack)
           stack->flushed_state = NULL;
         }
 
+      stack->age++;
       g_array_set_size (stack->stack, stack->stack->len - 1);
     }
 }
@@ -209,6 +214,7 @@ _cogl_matrix_stack_load_identity (CoglMatrixStack *stack)
 
       /* mark dirty */
       stack->flushed_state = NULL;
+      stack->age++;
     }
 }
 
@@ -225,6 +231,7 @@ _cogl_matrix_stack_scale (CoglMatrixStack *stack,
   /* mark dirty */
   stack->flushed_state = NULL;
   state->is_identity = FALSE;
+  stack->age++;
 }
 
 void
@@ -240,6 +247,7 @@ _cogl_matrix_stack_translate (CoglMatrixStack *stack,
   /* mark dirty */
   stack->flushed_state = NULL;
   state->is_identity = FALSE;
+  stack->age++;
 }
 
 void
@@ -256,6 +264,7 @@ _cogl_matrix_stack_rotate (CoglMatrixStack *stack,
   /* mark dirty */
   stack->flushed_state = NULL;
   state->is_identity = FALSE;
+  stack->age++;
 }
 
 void
@@ -269,6 +278,7 @@ _cogl_matrix_stack_multiply (CoglMatrixStack  *stack,
   /* mark dirty */
   stack->flushed_state = NULL;
   state->is_identity = FALSE;
+  stack->age++;
 }
 
 void
@@ -289,6 +299,7 @@ _cogl_matrix_stack_frustum (CoglMatrixStack *stack,
   /* mark dirty */
   stack->flushed_state = NULL;
   state->is_identity = FALSE;
+  stack->age++;
 }
 
 void
@@ -306,6 +317,7 @@ _cogl_matrix_stack_perspective (CoglMatrixStack *stack,
   /* mark dirty */
   stack->flushed_state = NULL;
   state->is_identity = FALSE;
+  stack->age++;
 }
 
 void
@@ -325,6 +337,7 @@ _cogl_matrix_stack_ortho (CoglMatrixStack *stack,
   /* mark dirty */
   stack->flushed_state = NULL;
   state->is_identity = FALSE;
+  stack->age++;
 }
 
 gboolean
@@ -448,3 +461,8 @@ _cogl_matrix_stack_dirty (CoglMatrixStack *stack)
   stack->flushed_identity = FALSE;
 }
 
+unsigned int
+_cogl_matrix_stack_get_age (CoglMatrixStack *stack)
+{
+  return stack->age;
+}

clutter/cogl/cogl/cogl-matrix-stack.h

@@ -87,4 +87,6 @@ void             _cogl_matrix_stack_flush_to_gl   (CoglMatrixStack  *stack,
                                                    CoglMatrixMode    mode);
 void             _cogl_matrix_stack_dirty         (CoglMatrixStack  *stack);
 
+unsigned int     _cogl_matrix_stack_get_age       (CoglMatrixStack *stack);
+
 #endif /* __COGL_MATRIX_STACK_H */