i965: disallow separate depth/stencil renderbuffers

Take advantage of the GL_FRAMEBUFFER_UNSUPPORTED feature to disallow separate
depth and stencil renderbuffers; only allow combined depth/stencil buffers.

Next up: remove/simplify a bunch of the depth/stencil renderbuffer code.

Also: restore the previously disabled GL_DEPTH_COMPONENT16 case

diff --git a/src/mesa/drivers/dri/intel/intel_fbo.c b/src/mesa/drivers/dri/intel/intel_fbo.c
index 81cd8dd41dbc7065bd01bc7593afbcddde7a69e4..ffe55bf19b86d9ac91af46d284a4b764aff8428e 100644 (file)
--- a/src/mesa/drivers/dri/intel/intel_fbo.c
+++ b/src/mesa/drivers/dri/intel/intel_fbo.c
@@ -168,18 +168,11 @@ intel_alloc_renderbuffer_storage(GLcontext * ctx, struct gl_renderbuffer *rb,
       cpp = 4;
       break;
    case GL_DEPTH_COMPONENT16:
-#if 0
       rb->_ActualFormat = GL_DEPTH_COMPONENT16;
       rb->DataType = GL_UNSIGNED_SHORT;
       rb->DepthBits = 16;
       cpp = 2;
       break;
-#else
-      /* fall-through.
-       * 16bpp depth renderbuffer can't be paired with a stencil buffer so
-       * always used combined depth/stencil format.
-       */
-#endif
    case GL_DEPTH_COMPONENT:
    case GL_DEPTH_COMPONENT24:
    case GL_DEPTH_COMPONENT32:
@@ -636,10 +629,17 @@ intel_finish_render_texture(GLcontext * ctx,
 static void
 intel_validate_framebuffer(GLcontext *ctx, struct gl_framebuffer *fb)
 {
-   /* no-op for now.
-    * Eventually: examine the renderbuffers/textures and make sure it's
-    * supported by the hw.
-    */
+   const struct intel_renderbuffer *depthRb =
+      intel_get_renderbuffer(fb, BUFFER_DEPTH);
+   const struct intel_renderbuffer *stencilRb =
+      intel_get_renderbuffer(fb, BUFFER_STENCIL);
+
+   if (stencilRb && stencilRb != depthRb) {
+      /* we only support combined depth/stencil buffers, not separate
+       * stencil buffers.
+       */
+      fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
+   }
 }