From 674c4b5630c92f29c6d55a4660c1af0615e25215 Mon Sep 17 00:00:00 2001
From: Neil Roberts <neil@linux.intel.com>
Date: Thu, 24 Feb 2011 20:30:30 +0000
Subject: [PATCH] Add a conformance test for atlas migration

This adds a conformance test which creates a lot of textures with
increasing size and destroys them again a number of times in order to
cause a few atlas migrations. The last time the textures are created
they are all read back and the data is verified to confirm that the
atlas migration successfully preserved the data.
---
 tests/conform/Makefile.am                 |    1 +
 tests/conform/test-cogl-atlas-migration.c |  133 +++++++++++++++++++++++++++++
 tests/conform/test-conform-main.c         |    1 +
 3 files changed, 135 insertions(+), 0 deletions(-)
 create mode 100644 tests/conform/test-cogl-atlas-migration.c

diff --git a/tests/conform/Makefile.am b/tests/conform/Makefile.am
index 5d7e295..b86c9fa 100644
--- a/tests/conform/Makefile.am
+++ b/tests/conform/Makefile.am
@@ -48,6 +48,7 @@ units_sources += \
 	test-cogl-texture-mipmaps.c     	\
 	test-cogl-texture-pixmap-x11.c  	\
 	test-cogl-texture-rectangle.c   	\
+	test-cogl-atlas-migration.c		\
 	test-cogl-vertex-buffer-contiguous.c 	\
 	test-cogl-vertex-buffer-interleved.c 	\
 	test-cogl-vertex-buffer-mutability.c 	\
diff --git a/tests/conform/test-cogl-atlas-migration.c b/tests/conform/test-cogl-atlas-migration.c
new file mode 100644
index 0000000..9042e8a
--- /dev/null
+++ b/tests/conform/test-cogl-atlas-migration.c
@@ -0,0 +1,133 @@
+#include <clutter/clutter.h>
+
+#include "test-conform-common.h"
+
+#define N_TEXTURES 128
+
+#define OPACITY_FOR_ROW(y) \
+  (0xff - ((y) & 0xf) * 0x10)
+
+#define COLOR_FOR_SIZE(size) \
+  (colors + (size) % 3)
+
+static const ClutterColor colors[] =
+  { { 0xff, 0x00, 0x00, 0xff },
+    { 0x00, 0xff, 0x00, 0xff },
+    { 0x00, 0x00, 0xff, 0xff } };
+
+static CoglHandle
+create_texture (int size)
+{
+  CoglHandle texture;
+  const ClutterColor *color;
+  guint8 *data, *p;
+  int x, y;
+
+  /* Create a red, green or blue texture depending on the size */
+  color = COLOR_FOR_SIZE (size);
+
+  p = data = g_malloc (size * size * 4);
+
+  /* Fill the data with the color but fade the opacity out with
+     increasing y coordinates so that we can see the blending it the
+     atlas migration accidentally blends with garbage in the
+     texture */
+  for (y = 0; y < size; y++)
+    {
+      int opacity = OPACITY_FOR_ROW (y);
+
+      for (x = 0; x < size; x++)
+        {
+          /* Store the colors premultiplied */
+          p[0] = color->red * opacity / 255;
+          p[1] = color->green * opacity / 255;
+          p[2] = color->blue * opacity / 255;
+          p[3] = opacity;
+
+          p += 4;
+        }
+    }
+
+  texture = cogl_texture_new_from_data (size, /* width */
+                                        size, /* height */
+                                        COGL_TEXTURE_NONE, /* flags */
+                                        /* format */
+                                        COGL_PIXEL_FORMAT_RGBA_8888,
+                                        /* internal format */
+                                        COGL_PIXEL_FORMAT_RGBA_8888,
+                                        /* rowstride */
+                                        size * 4,
+                                        data);
+
+  g_free (data);
+
+  return texture;
+}
+
+static void
+verify_texture (CoglHandle texture, int size)
+{
+  guint8 *data, *p;
+  int x, y;
+  const ClutterColor *color;
+
+  color = COLOR_FOR_SIZE (size);
+
+  p = data = g_malloc (size * size * 4);
+
+  cogl_texture_get_data (texture,
+                         COGL_PIXEL_FORMAT_RGBA_8888,
+                         size * 4,
+                         data);
+
+  for (y = 0; y < size; y++)
+    {
+      int opacity = OPACITY_FOR_ROW (y);
+
+      for (x = 0; x < size; x++)
+        {
+          g_assert_cmpint (p[0], ==, color->red * opacity / 255);
+          g_assert_cmpint (p[1], ==, color->green * opacity / 255);
+          g_assert_cmpint (p[2], ==, color->blue * opacity / 255);
+          g_assert_cmpint (p[3], ==, opacity);
+
+          p += 4;
+        }
+    }
+
+  g_free (data);
+}
+
+void
+test_cogl_atlas_migration (TestConformSimpleFixture *fixture,
+                           gconstpointer data)
+{
+  CoglHandle textures[N_TEXTURES];
+  int i, tex_num;
+
+  /* Create and destroy all of the textures a few times to increase
+     the chances that we'll end up reusing the buffers for previously
+     discarded atlases */
+  for (i = 0; i < 5; i++)
+    {
+      for (tex_num = 0; tex_num < N_TEXTURES; tex_num++)
+        textures[tex_num] = create_texture (tex_num + 1);
+      for (tex_num = 0; tex_num < N_TEXTURES; tex_num++)
+        cogl_object_unref (textures[tex_num]);
+    }
+
+  /* Create all the textures again */
+  for (tex_num = 0; tex_num < N_TEXTURES; tex_num++)
+    textures[tex_num] = create_texture (tex_num + 1);
+
+  /* Verify that they all still have the right data */
+  for (tex_num = 0; tex_num < N_TEXTURES; tex_num++)
+    verify_texture (textures[tex_num], tex_num + 1);
+
+  /* Destroy them all */
+  for (tex_num = 0; tex_num < N_TEXTURES; tex_num++)
+    cogl_object_unref (textures[tex_num]);
+
+  if (g_test_verbose ())
+    g_print ("OK\n");
+}
diff --git a/tests/conform/test-conform-main.c b/tests/conform/test-conform-main.c
index fae6a20..7fa1e8d 100644
--- a/tests/conform/test-conform-main.c
+++ b/tests/conform/test-conform-main.c
@@ -230,6 +230,7 @@ main (int argc, char **argv)
   TEST_CONFORM_SIMPLE ("/cogl/texture", test_cogl_wrap_modes);
   TEST_CONFORM_SIMPLE ("/cogl/texture", test_cogl_texture_pixmap_x11);
   TEST_CONFORM_SIMPLE ("/cogl/texture", test_cogl_texture_get_set_data);
+  TEST_CONFORM_SIMPLE ("/cogl/texture", test_cogl_atlas_migration);

   TEST_CONFORM_SIMPLE ("/cogl/vertex-buffer", test_cogl_vertex_buffer_contiguous);
   TEST_CONFORM_SIMPLE ("/cogl/vertex-buffer", test_cogl_vertex_buffer_interleved);
--
1.7.3.16.g9464b