1 files changed, 136 insertions, 0 deletions
diff --git a/tests/conform/test-texture-mipmaps.c b/tests/conform/test-texture-mipmaps.c
new file mode 100644
index 00000000..22e27b74
--- /dev/null
+++ b/tests/conform/test-texture-mipmaps.c
@@ -0,0 +1,136 @@
+#include <clutter/clutter.h>
+#include <cogl/cogl.h>
+#include <string.h>
+
+#include "test-conform-common.h"
+
+static const ClutterColor stage_color = { 0x00, 0x00, 0x00, 0xff };
+
+#define TEX_SIZE 64
+
+typedef struct _TestState
+{
+  unsigned int padding;
+} TestState;
+
+/* Creates a texture where the pixels are evenly divided between
+   selecting just one of the R,G and B components */
+static CoglHandle
+make_texture (void)
+{
+  guchar *tex_data = g_malloc (TEX_SIZE * TEX_SIZE * 3), *p = tex_data;
+  CoglHandle tex;
+  int x, y;
+
+  for (y = 0; y < TEX_SIZE; y++)
+    for (x = 0; x < TEX_SIZE; x++)
+      {
+        memset (p, 0, 3);
+        /* Set one of the components to full. The components should be
+           evenly represented so that each gets a third of the
+           texture */
+        p[(p - tex_data) / (TEX_SIZE * TEX_SIZE * 3 / 3)] = 255;
+        p += 3;
+      }
+
+  tex = cogl_texture_new_from_data (TEX_SIZE, TEX_SIZE, COGL_TEXTURE_NONE,
+                                    COGL_PIXEL_FORMAT_RGB_888,
+                                    COGL_PIXEL_FORMAT_ANY,
+                                    TEX_SIZE * 3,
+                                    tex_data);
+
+  g_free (tex_data);
+
+  return tex;
+}
+
+static void
+on_paint (ClutterActor *actor, TestState *state)
+{
+  CoglHandle tex;
+  CoglHandle material;
+  guint8 pixels[8];
+
+  tex = make_texture ();
+  material = cogl_material_new ();
+  cogl_material_set_layer (material, 0, tex);
+  cogl_handle_unref (tex);
+
+  /* Render a 1x1 pixel quad without mipmaps */
+  cogl_set_source (material);
+  cogl_material_set_layer_filters (material, 0,
+                                   COGL_MATERIAL_FILTER_NEAREST,
+                                   COGL_MATERIAL_FILTER_NEAREST);
+  cogl_rectangle (0, 0, 1, 1);
+  /* Then with mipmaps */
+  cogl_material_set_layer_filters (material, 0,
+                                   COGL_MATERIAL_FILTER_NEAREST_MIPMAP_NEAREST,
+                                   COGL_MATERIAL_FILTER_NEAREST);
+  cogl_rectangle (1, 0, 2, 1);
+
+  cogl_handle_unref (material);
+
+  /* Read back the two pixels we rendered */
+  cogl_read_pixels (0, 0, 2, 1,
+                    COGL_READ_PIXELS_COLOR_BUFFER,
+                    COGL_PIXEL_FORMAT_RGBA_8888_PRE,
+                    pixels);
+
+  /* The first pixel should be just one of the colors from the
+     texture. It doesn't matter which one */
+  g_assert ((pixels[0] == 255 && pixels[1] == 0 && pixels[2] == 0) ||
+            (pixels[0] == 0 && pixels[1] == 255 && pixels[2] == 0) ||
+            (pixels[0] == 0 && pixels[1] == 0 && pixels[2] == 255));
+  /* The second pixel should be more or less the average of all of the
+     pixels in the texture. Each component gets a third of the image
+     so each component should be approximately 255/3 */
+  g_assert (ABS (pixels[4] - 255 / 3) <= 3 &&
+            ABS (pixels[5] - 255 / 3) <= 3 &&
+            ABS (pixels[6] - 255 / 3) <= 3);
+
+  /* Comment this out if you want visual feedback for what this test paints */
+#if 1
+  clutter_main_quit ();
+#endif
+}
+
+static gboolean
+queue_redraw (gpointer stage)
+{
+  clutter_actor_queue_redraw (CLUTTER_ACTOR (stage));
+
+  return TRUE;
+}
+
+void
+test_cogl_texture_mipmaps (TestUtilsGTestFixture *fixture,
+                           void *data)
+{
+  TestState state;
+  ClutterActor *stage;
+  ClutterActor *group;
+  unsigned int idle_source;
+
+  stage = clutter_stage_get_default ();
+
+  clutter_stage_set_color (CLUTTER_STAGE (stage), &stage_color);
+
+  group = clutter_group_new ();
+  clutter_container_add_actor (CLUTTER_CONTAINER (stage), group);
+
+  /* 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, stage);
+
+  g_signal_connect (group, "paint", G_CALLBACK (on_paint), &state);
+
+  clutter_actor_show_all (stage);
+
+  clutter_main ();
+
+  g_source_remove (idle_source);
+
+  if (g_test_verbose ())
+    g_print ("OK\n");
+}