Support retrieving depth textures from framebufferswip/depth-texture

This commit introduces two new funtions on framebuffers to be able to
retrieve the depth buffer as a texture for further usage, say, to
implement shadow mapping.

The proposed API works as follow:
  * Before the framebuffer is allocated, you can request that a depth
    texture is created with cogl_framebuffer_enable_depth_texture()
  * cogl_framebuffer_get_depth_texture() can then be used to grab a
    CoglTexture

1 files changed, 6 insertions, 0 deletions

diff --git a/examples/cogl-info.c b/examples/cogl-info.c
index b7dab007..7c43fe2c 100644
--- a/examples/cogl-info.c
+++ b/examples/cogl-info.c
@@ -109,6 +109,12 @@ struct {
     "GLES2 API integration supported",
     "Support for creating a GLES2 context for using the GLES2 API in a "
       "way that's integrated with Cogl."
+  },
+  {
+    COGL_FEATURE_ID_DEPTH_TEXTURE,
+    "Depth Textures",
+    "CoglFramebuffers can be configured to render their depth buffer into "
+    "a texture"
   }
 };