mesa: add helper func for checking combined depthstencil buffers from st/mesa

Reviewed-by: Brian Paul <[email protected]>
Tested-by: Brian Paul <[email protected]>

2 files changed, 29 insertions, 0 deletions

diff --git a/src/mesa/main/fbobject.c b/src/mesa/main/fbobject.c
index 0126e293051..d7e15e1ce6c 100644
--- a/src/mesa/main/fbobject.c
+++ b/src/mesa/main/fbobject.c
@@ -474,6 +474,32 @@ _mesa_validate_framebuffer(struct gl_context *ctx, struct gl_framebuffer *fb)
 
 
 /**
+ * Return true if the framebuffer has a combined depth/stencil
+ * renderbuffer attached.
+ */
+GLboolean
+_mesa_has_depthstencil_combined(const struct gl_framebuffer *fb)
+{
+   const struct gl_renderbuffer_attachment *depth =
+         &fb->Attachment[BUFFER_DEPTH];
+   const struct gl_renderbuffer_attachment *stencil =
+         &fb->Attachment[BUFFER_STENCIL];
+
+   if (depth->Type == stencil->Type) {
+      if (depth->Type == GL_RENDERBUFFER_EXT &&
+          depth->Renderbuffer == stencil->Renderbuffer)
+         return GL_TRUE;
+
+      if (depth->Type == GL_TEXTURE &&
+          depth->Texture == stencil->Texture)
+         return GL_TRUE;
+   }
+
+   return GL_FALSE;
+}
+
+
+/**
  * For debug only.
  */
 static void
diff --git a/src/mesa/main/fbobject.h b/src/mesa/main/fbobject.h
index ec8b0afe410..0358864d798 100644
--- a/src/mesa/main/fbobject.h
+++ b/src/mesa/main/fbobject.h
@@ -113,6 +113,9 @@ _mesa_framebuffer_renderbuffer(struct gl_context *ctx,
 extern void
 _mesa_validate_framebuffer(struct gl_context *ctx, struct gl_framebuffer *fb);
 
+extern GLboolean
+_mesa_has_depthstencil_combined(const struct gl_framebuffer *fb);
+
 extern void
 _mesa_test_framebuffer_completeness(struct gl_context *ctx,
                                     struct gl_framebuffer *fb);