Add a test for getting the component sizes from different fbs

This adds a test which creates two offscreen framebuffers, one with
just an alpha component texture and the other will a full RGBA
texture. The bit sizes of both framebuffers are then checked to verify
that they either have or haven't got bits for the RGB components.

The test currently fails because the framebuffer functions don't bind
the framebuffer before querying so they just query whichever
framebuffer happened to be used last.

Reviewed-by: Robert Bragg <robert@linux.intel.com>

(cherry picked from commit 7ca01373efe908efc9f18f2cb7f4a51c274ef677)

5 files changed, 52 insertions, 1 deletions

diff --git a/tests/conform/Makefile.am b/tests/conform/Makefile.am
index 3cc1e144..90d972ec 100644
--- a/tests/conform/Makefile.am
+++ b/tests/conform/Makefile.am
@@ -62,6 +62,7 @@ test_sources = \
 	test-alpha-textures.c \
 	test-wrap-rectangle-textures.c \
 	test-texture-get-set-data.c \
+	test-framebuffer-get-bits.c \
 	$(NULL)
 
 test_conformance_SOURCES = $(common_sources) $(test_sources)
diff --git a/tests/conform/test-conform-main.c b/tests/conform/test-conform-main.c
index b0aaebdd..21df8512 100644
--- a/tests/conform/test-conform-main.c
+++ b/tests/conform/test-conform-main.c
@@ -98,6 +98,9 @@ main (int argc, char **argv)
   ADD_TEST (test_bitmask, 0, 0);
 
   ADD_TEST (test_offscreen, 0, 0);
+  ADD_TEST (test_framebuffer_get_bits,
+            TEST_REQUIREMENT_OFFSCREEN,
+            TEST_KNOWN_FAILURE);
 
   ADD_TEST (test_point_size, 0, 0);
   ADD_TEST (test_point_sprite,
diff --git a/tests/conform/test-framebuffer-get-bits.c b/tests/conform/test-framebuffer-get-bits.c
new file mode 100644
index 00000000..ac7ab529
--- /dev/null
+++ b/tests/conform/test-framebuffer-get-bits.c
@@ -0,0 +1,40 @@
+#include <cogl/cogl.h>
+
+#include "test-utils.h"
+
+void
+test_framebuffer_get_bits (void)
+{
+  CoglTexture2D *tex_a =
+    cogl_texture_2d_new_with_size (test_ctx,
+                                   16, 16, /* width/height */
+                                   COGL_PIXEL_FORMAT_A_8);
+  CoglOffscreen *offscreen_a =
+    cogl_offscreen_new_to_texture (COGL_TEXTURE (tex_a));
+  CoglFramebuffer *fb_a = COGL_FRAMEBUFFER (offscreen_a);
+  CoglTexture2D *tex_rgba =
+    cogl_texture_2d_new_with_size (test_ctx,
+                                   16, 16, /* width/height */
+                                   COGL_PIXEL_FORMAT_RGBA_8888);
+  CoglOffscreen *offscreen_rgba =
+    cogl_offscreen_new_to_texture (COGL_TEXTURE (tex_rgba));
+  CoglFramebuffer *fb_rgba = COGL_FRAMEBUFFER (offscreen_rgba);
+
+  cogl_framebuffer_allocate (fb_a, NULL);
+  cogl_framebuffer_allocate (fb_rgba, NULL);
+
+  g_assert_cmpint (cogl_framebuffer_get_red_bits (fb_a), ==, 0);
+  g_assert_cmpint (cogl_framebuffer_get_green_bits (fb_a), ==, 0);
+  g_assert_cmpint (cogl_framebuffer_get_blue_bits (fb_a), ==, 0);
+  g_assert_cmpint (cogl_framebuffer_get_alpha_bits (fb_a), >=, 1);
+
+  g_assert_cmpint (cogl_framebuffer_get_red_bits (fb_rgba), >=, 1);
+  g_assert_cmpint (cogl_framebuffer_get_green_bits (fb_rgba), >=, 1);
+  g_assert_cmpint (cogl_framebuffer_get_blue_bits (fb_rgba), >=, 1);
+  g_assert_cmpint (cogl_framebuffer_get_alpha_bits (fb_rgba), >=, 1);
+
+  cogl_object_unref (fb_rgba);
+  cogl_object_unref (tex_rgba);
+  cogl_object_unref (fb_a);
+  cogl_object_unref (tex_a);
+}
diff --git a/tests/conform/test-utils.c b/tests/conform/test-utils.c
index 6062ec64..b39dd113 100644
--- a/tests/conform/test-utils.c
+++ b/tests/conform/test-utils.c
@@ -65,6 +65,12 @@ check_flags (TestFlags flags,
       return FALSE;
     }
 
+  if (flags & TEST_REQUIREMENT_OFFSCREEN &&
+      !cogl_has_feature (test_ctx, COGL_FEATURE_ID_OFFSCREEN))
+    {
+      return FALSE;
+    }
+
   if (flags & TEST_KNOWN_FAILURE)
     {
       return FALSE;
diff --git a/tests/conform/test-utils.h b/tests/conform/test-utils.h
index ec96913d..e698f324 100644
--- a/tests/conform/test-utils.h
+++ b/tests/conform/test-utils.h
@@ -19,7 +19,8 @@ typedef enum _TestFlags
   TEST_REQUIREMENT_POINT_SPRITE = 1<<5,
   TEST_REQUIREMENT_GLES2_CONTEXT = 1<<6,
   TEST_REQUIREMENT_MAP_WRITE = 1<<7,
-  TEST_REQUIREMENT_GLSL = 1<<8
+  TEST_REQUIREMENT_GLSL = 1<<8,
+  TEST_REQUIREMENT_OFFSCREEN = 1<<9
 } TestFlags;
 
 extern CoglContext *test_ctx;