From d4ffa2f819737b0f06e7a1b1e83c6c648b11b8ca Mon Sep 17 00:00:00 2001
From: Robert Bragg <robert@linux.intel.com>
Date: Wed, 4 Nov 2009 16:55:18 +0000
Subject: [PATCH] [debug] Adds a COGL_DEBUG=force-scanline-paths

For a long time now the GLES driver for Cogl has supported a fallback
scanline rasterizer for filling paths when no stencil buffer is available,
but now that we build the same cogl-primitives code for GL and GLES I
thought it may sometimes be useful for debugging to force Cogl to use the
scanline rasterizer instead of the current stencil buffer approach.
---
 cogl/cogl-debug.c      | 3 ++-
 cogl/cogl-debug.h      | 3 ++-
 cogl/cogl-primitives.c | 3 ++-
 3 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/cogl/cogl-debug.c b/cogl/cogl-debug.c
index efc0146a3..3545de860 100644
--- a/cogl/cogl-debug.c
+++ b/cogl/cogl-debug.c
@@ -47,7 +47,8 @@ static const GDebugKey cogl_debug_keys[] = {
   { "journal", COGL_DEBUG_JOURNAL },
   { "batching", COGL_DEBUG_BATCHING },
   { "disable-software-transform", COGL_DEBUG_DISABLE_SOFTWARE_TRANSFORM },
-  { "matrices", COGL_DEBUG_MATRICES }
+  { "matrices", COGL_DEBUG_MATRICES },
+  { "force-scanline-paths", COGL_DEBUG_FORCE_SCANLINE_PATHS }
 };
 
 static const gint n_cogl_debug_keys = G_N_ELEMENTS (cogl_debug_keys);
diff --git a/cogl/cogl-debug.h b/cogl/cogl-debug.h
index 86d3b57db..fb0e839ee 100644
--- a/cogl/cogl-debug.h
+++ b/cogl/cogl-debug.h
@@ -45,7 +45,8 @@ typedef enum {
   COGL_DEBUG_JOURNAL          = 1 << 13,
   COGL_DEBUG_BATCHING         = 1 << 14,
   COGL_DEBUG_DISABLE_SOFTWARE_TRANSFORM = 1 << 15,
-  COGL_DEBUG_MATRICES = 1 << 16
+  COGL_DEBUG_MATRICES         = 1 << 16,
+  COGL_DEBUG_FORCE_SCANLINE_PATHS = 1 << 17
 } CoglDebugFlags;
 
 #ifdef COGL_ENABLE_DEBUG
diff --git a/cogl/cogl-primitives.c b/cogl/cogl-primitives.c
index 2fc69160c..c72aa740b 100644
--- a/cogl/cogl-primitives.c
+++ b/cogl/cogl-primitives.c
@@ -1452,7 +1452,8 @@ _cogl_path_fill_nodes (void)
   _cogl_path_get_bounds (ctx->path_nodes_min, ctx->path_nodes_max,
                          &bounds_x, &bounds_y, &bounds_w, &bounds_h);
 
-  if (cogl_features_available (COGL_FEATURE_STENCIL_BUFFER))
+  if (G_LIKELY (!(cogl_debug_flags & COGL_DEBUG_FORCE_SCANLINE_PATHS)) &&
+      cogl_features_available (COGL_FEATURE_STENCIL_BUFFER))
     {
       CoglHandle draw_buffer;
       CoglClipStackState *clip_state;