[gtk/wip/baedert/gl-rework: 1/41] gl renderer: Only send clip corners if we need to

[Timm Bäder <baedert src gnome org>]

commit 70858648b06516330117f6f0900fd037aa02609f
Author: Timm Bäder <mail baedert org>
Date:   Sat Dec 14 15:41:32 2019 +0100

    gl renderer: Only send clip corners if we need to
    
    We change the clip bounds a lot more ofthen than the clip corners and
    they are already split up in the shader, so only send the corners if we
    need to.

 gsk/gl/gskglrenderer.c  | 14 ++++++++++++--
 gsk/gl/gskglrenderops.c | 34 +++++++++++++++++++++++++++++++---
 gsk/gl/opbuffer.h       |  1 +
 3 files changed, 44 insertions(+), 5 deletions(-)
---
diff --git a/gsk/gl/gskglrenderer.c b/gsk/gl/gskglrenderer.c
index 1713c5e757..7f77670977 100644
--- a/gsk/gl/gskglrenderer.c
+++ b/gsk/gl/gskglrenderer.c
@@ -2521,9 +2521,19 @@ static inline void
 apply_clip_op (const Program *program,
                const OpClip  *op)
 {
-  OP_PRINT (" -> Clip: %s", gsk_rounded_rect_to_string (&op->clip));
   glUniform4fv (program->clip_rect_bounds_location, 1, (float *)&op->clip.bounds);
-  glUniform2fv (program->clip_rect_corners_location, 4, (float *)&op->clip.corner);
+
+  if (op->send_corners)
+    {
+      OP_PRINT (" -> Clip: %s", gsk_rounded_rect_to_string (&op->clip));
+      glUniform2fv (program->clip_rect_corners_location, 4, (float *)&op->clip.corner);
+    }
+  else
+    {
+      OP_PRINT (" -> clip: %f, %f, %f, %f",
+                op->clip.bounds.origin.x, op->clip.bounds.origin.y,
+                op->clip.bounds.size.width, op->clip.bounds.size.height);
+    }
 }
 
 static inline void
diff --git a/gsk/gl/gskglrenderops.c b/gsk/gl/gskglrenderops.c
index c2c7858dfb..5ab089493f 100644
--- a/gsk/gl/gskglrenderops.c
+++ b/gsk/gl/gskglrenderops.c
@@ -8,6 +8,23 @@ rect_equal (const graphene_rect_t *a,
   return memcmp (a, b, sizeof (graphene_rect_t)) == 0;
 }
 
+static inline gboolean
+rounded_rect_corners_equal (const GskRoundedRect *r1,
+                            const GskRoundedRect *r2)
+{
+  int i;
+
+  if (!r1)
+    return FALSE;
+
+  for (i = 0; i < 4; i ++)
+    if (r1->corner[i].width != r2->corner[i].width ||
+        r1->corner[i].height != r2->corner[i].height)
+      return FALSE;
+
+  return TRUE;
+}
+
 static inline ProgramState *
 get_current_program_state (RenderOpBuilder *builder)
 {
@@ -252,6 +269,7 @@ ops_set_program (RenderOpBuilder *builder,
 
       opc = ops_begin (builder, OP_CHANGE_CLIP);
       opc->clip = *builder->current_clip;
+      opc->send_corners = !rounded_rect_corners_equal (builder->current_clip, &program_state->clip);
       program_state->clip = *builder->current_clip;
     }
 
@@ -273,15 +291,25 @@ ops_set_clip (RenderOpBuilder      *builder,
   OpClip *op;
 
   if (current_program_state &&
-      memcmp (&current_program_state->clip, clip,sizeof (GskRoundedRect)) == 0)
+      rounded_rect_equal (&current_program_state->clip, clip))
     return;
 
   if (!(op = op_buffer_peek_tail_checked (&builder->render_ops, OP_CHANGE_CLIP)))
-    op = op_buffer_add (&builder->render_ops, OP_CHANGE_CLIP);
+    {
+      op = op_buffer_add (&builder->render_ops, OP_CHANGE_CLIP);
+      op->send_corners = !current_program_state ||
+                         !rounded_rect_corners_equal (&current_program_state->clip, clip);
+    }
+  else
+    {
+      /* If the op before sent the corners, this one needs, too */
+      op->send_corners |= !current_program_state ||
+                          !rounded_rect_corners_equal (&current_program_state->clip, clip);
+    }
 
   op->clip = *clip;
 
-  if (builder->current_program != NULL)
+  if (current_program_state)
     current_program_state->clip = *clip;
 }
 
diff --git a/gsk/gl/opbuffer.h b/gsk/gl/opbuffer.h
index 04ae799490..8578bc108b 100644
--- a/gsk/gl/opbuffer.h
+++ b/gsk/gl/opbuffer.h
@@ -88,6 +88,7 @@ typedef struct
 typedef struct
 {
   GskRoundedRect clip;
+  guint send_corners: 1;
 } OpClip;
 
 typedef struct