Add a conformance test for rectangle textures

The test creates a GL_TEXTURE_RECTANGLE_ARB texture using
cogl_texture_new_from_foreign and confirms that rendering it works
correctly. If the rectangle texture extension isn't available then
this test always succeeds.

http://bugzilla.openedhand.com/show_bug.cgi?id=2015

tests/conform/Makefile.am

@@ -26,6 +26,7 @@ test_conformance_SOURCES = 		\
 	test-cogl-readpixels.c		\
 	test-cogl-multitexture.c        \
 	test-cogl-texture-mipmaps.c     \
+	test-cogl-texture-rectangle.c   \
 	test-cogl-pixel-buffer.c	\
 	test-path.c 			\
 	test-pick.c 			\

tests/conform/test-cogl-texture-rectangle.c

@@ -0,0 +1,268 @@
+#include <clutter/clutter.h>
+#include <string.h>
+
+#include "test-conform-common.h"
+
+static const ClutterColor stage_color = { 0x0, 0x0, 0x0, 0xff };
+
+typedef struct _TestState
+{
+  ClutterActor *stage;
+  guint frame;
+} TestState;
+
+static CoglHandle
+create_source_rect (void)
+{
+#ifdef GL_TEXTURE_RECTANGLE_ARB
+
+  int x, y;
+  guint8 *data = g_malloc (256 * 256 * 4), *p = data;
+  CoglHandle tex;
+  GLuint gl_tex;
+
+  for (y = 0; y < 256; y++)
+    for (x = 0; x < 256; x++)
+      {
+        *(p++) = x;
+        *(p++) = y;
+        *(p++) = 0;
+        *(p++) = 255;
+      }
+
+  glPixelStorei (GL_UNPACK_ROW_LENGTH, 256);
+  glPixelStorei (GL_UNPACK_ALIGNMENT, 8);
+  glPixelStorei (GL_UNPACK_SKIP_ROWS, 0);
+  glPixelStorei (GL_UNPACK_SKIP_PIXELS, 0);
+
+  glGenTextures (1, &gl_tex);
+  glBindTexture (GL_TEXTURE_RECTANGLE_ARB, gl_tex);
+  glTexImage2D (GL_TEXTURE_RECTANGLE_ARB, 0,
+                GL_RGBA, 256, 256, 0,
+                GL_RGBA,
+                GL_UNSIGNED_BYTE,
+                data);
+
+  g_assert (glGetError () == GL_NO_ERROR);
+
+  g_free (data);
+
+  tex = cogl_texture_new_from_foreign (gl_tex,
+                                       GL_TEXTURE_RECTANGLE_ARB,
+                                       256, 256, 0, 0,
+                                       COGL_PIXEL_FORMAT_RGBA_8888);
+
+  return tex;
+
+#else /* GL_TEXTURE_RECTANGLE_ARB */
+
+  return COGL_INVALID_HANDLE;
+
+#endif /* GL_TEXTURE_RECTANGLE_ARB */
+}
+
+static CoglHandle
+create_source_2d (void)
+{
+  int x, y;
+  guint8 *data = g_malloc (256 * 256 * 4), *p = data;
+  CoglHandle tex;
+
+  for (y = 0; y < 256; y++)
+    for (x = 0; x < 256; x++)
+      {
+        *(p++) = 0;
+        *(p++) = x;
+        *(p++) = y;
+        *(p++) = 255;
+      }
+
+  tex = cogl_texture_new_from_data (256, 256, COGL_TEXTURE_NONE,
+                                    COGL_PIXEL_FORMAT_RGBA_8888_PRE,
+                                    COGL_PIXEL_FORMAT_ANY,
+                                    256 * 4,
+                                    data);
+
+  g_free (data);
+
+  return tex;
+}
+
+static void
+draw_frame (TestState *state)
+{
+  GLuint gl_tex;
+  CoglHandle tex_rect = create_source_rect ();
+  CoglHandle material_rect = cogl_material_new ();
+  CoglHandle tex_2d = create_source_2d ();
+  CoglHandle material_2d = cogl_material_new ();
+
+  g_assert (tex_rect != COGL_INVALID_HANDLE);
+
+  cogl_material_set_layer (material_rect, 0, tex_rect);
+  cogl_material_set_layer_filters (material_rect, 0,
+                                   COGL_MATERIAL_FILTER_NEAREST,
+                                   COGL_MATERIAL_FILTER_NEAREST);
+
+  cogl_material_set_layer (material_2d, 0, tex_2d);
+  cogl_material_set_layer_filters (material_2d, 0,
+                                   COGL_MATERIAL_FILTER_NEAREST,
+                                   COGL_MATERIAL_FILTER_NEAREST);
+
+  cogl_set_source (material_rect);
+
+  /* Render the texture repeated horizontally twice */
+  cogl_rectangle_with_texture_coords (0.0f, 0.0f, 512.0f, 256.0f,
+                                      0.0f, 0.0f, 2.0f, 1.0f);
+  /* Render the top half of the texture to test without repeating */
+  cogl_rectangle_with_texture_coords (0.0f, 256.0f, 256.0f, 384.0f,
+                                      0.0f, 0.0f, 1.0f, 0.5f);
+
+  cogl_set_source (material_2d);
+
+  /* Render the top half of a regular 2D texture */
+  cogl_rectangle_with_texture_coords (256.0f, 256.0f, 512.0f, 384.0f,
+                                      0.0f, 0.0f, 1.0f, 0.5f);
+
+  /* Flush the rendering now so we can safely delete the texture */
+  cogl_flush ();
+
+  cogl_handle_unref (material_rect);
+
+  /* Cogl doesn't destroy foreign textures so we have to do it manually */
+  cogl_texture_get_gl_texture (tex_rect, &gl_tex, NULL);
+  glDeleteTextures (1, &gl_tex);
+  cogl_handle_unref (tex_rect);
+}
+
+static void
+validate_result (TestState *state)
+{
+  guint8 *data, *p;
+  int x, y;
+
+  p = data = g_malloc (512 * 256 * 4);
+
+  cogl_read_pixels (0, 0, 512, 384,
+                    COGL_READ_PIXELS_COLOR_BUFFER,
+                    COGL_PIXEL_FORMAT_RGBA_8888,
+                    data);
+
+  for (y = 0; y < 384; y++)
+    for (x = 0; x < 512; x++)
+      {
+        if (x >= 256 && y >= 256)
+          {
+            g_assert_cmpint (p[0], ==, 0);
+            g_assert_cmpint (p[1], ==, x & 0xff);
+            g_assert_cmpint (p[2], ==, y & 0xff);
+          }
+        else
+          {
+            g_assert_cmpint (p[0], ==, x & 0xff);
+            g_assert_cmpint (p[1], ==, y & 0xff);
+            g_assert_cmpint (p[2], ==, 0);
+          }
+        p += 4;
+      }
+
+  g_free (data);
+
+  /* Comment this out to see what the test paints */
+  clutter_main_quit ();
+}
+
+static void
+on_paint (ClutterActor *actor, TestState *state)
+{
+  int frame_num;
+
+  draw_frame (state);
+
+  /* XXX: Experiments have shown that for some buggy drivers, when using
+   * glReadPixels there is some kind of race, so we delay our test for a
+   * few frames and a few seconds:
+   */
+  /* Need to increment frame first because clutter_stage_read_pixels
+     fires a redraw */
+  frame_num = state->frame++;
+  if (frame_num == 2)
+    validate_result (state);
+  else if (frame_num < 2)
+    g_usleep (G_USEC_PER_SEC);
+}
+
+static gboolean
+queue_redraw (gpointer stage)
+{
+  clutter_actor_queue_redraw (CLUTTER_ACTOR (stage));
+
+  return TRUE;
+}
+
+static gboolean
+check_rectangle_extension (void)
+{
+  static const char rect_extension[] = "GL_ARB_texture_rectangle";
+  const char *extensions = (const char *) glGetString (GL_EXTENSIONS);
+  const char *extensions_end;
+
+  extensions_end = extensions + strlen (extensions);
+
+  while (extensions < extensions_end)
+    {
+      const char *end = strchr (extensions, ' ');
+
+      if (end == NULL)
+        end = extensions_end;
+
+      if (end - extensions == sizeof (rect_extension) - 1 &&
+          !memcmp (extensions, rect_extension, sizeof (rect_extension) - 1))
+        return TRUE;
+
+      extensions = end + 1;
+    }
+
+  return FALSE;
+}
+
+void
+test_cogl_texture_rectangle (TestConformSimpleFixture *fixture,
+                             gconstpointer data)
+{
+  TestState state;
+  guint idle_source;
+  guint paint_handler;
+
+  state.frame = 0;
+
+  state.stage = clutter_stage_get_default ();
+
+  /* Check whether GL supports the rectangle extension. If not we'll
+     just assume the test passes */
+  if (check_rectangle_extension ())
+    {
+      clutter_stage_set_color (CLUTTER_STAGE (state.stage), &stage_color);
+
+      /* We force continuous redrawing of the stage, since we need to skip
+       * the first few frames, and we wont be doing anything else that
+       * will trigger redrawing. */
+      idle_source = g_idle_add (queue_redraw, state.stage);
+
+      paint_handler = g_signal_connect_after (state.stage, "paint",
+                                              G_CALLBACK (on_paint), &state);
+
+      clutter_actor_show_all (state.stage);
+
+      clutter_main ();
+
+      g_source_remove (idle_source);
+      g_signal_handler_disconnect (state.stage, paint_handler);
+
+      if (g_test_verbose ())
+        g_print ("OK\n");
+    }
+  else if (g_test_verbose ())
+    g_print ("Skipping\n");
+}
+

tests/conform/test-conform-main.c

@@ -198,6 +198,7 @@ main (int argc, char **argv)
   TEST_CONFORM_SIMPLE ("/cogl/texture", test_cogl_texture_mipmaps);
   TEST_CONFORM_SIMPLE ("/cogl/texture", test_cogl_sub_texture);
   TEST_CONFORM_SIMPLE ("/cogl/texture", test_cogl_pixel_buffer);
+  TEST_CONFORM_SIMPLE ("/cogl/texture", test_cogl_texture_rectangle);
 
   TEST_CONFORM_SIMPLE ("/cogl/vertex-buffer", test_cogl_vertex_buffer_contiguous);
   TEST_CONFORM_SIMPLE ("/cogl/vertex-buffer", test_cogl_vertex_buffer_interleved);