1 files changed, 43 insertions, 5 deletions

diff --git a/src/mesa/main/fbobject.c b/src/mesa/main/fbobject.c
index e7da58d43d2..867798cc291 100644
--- a/src/mesa/main/fbobject.c
+++ b/src/mesa/main/fbobject.c
@@ -341,6 +341,47 @@ _mesa_remove_attachment(struct gl_context *ctx,
    att->Complete = GL_TRUE;
 }
 
+/**
+ * Create a renderbuffer which will be set up by the driver to wrap the
+ * texture image slice.
+ *
+ * By using a gl_renderbuffer (like user-allocated renderbuffers), drivers get
+ * to share most of their framebuffer rendering code between winsys,
+ * renderbuffer, and texture attachments.
+ *
+ * The allocated renderbuffer uses a non-zero Name so that drivers can check
+ * it for determining vertical orientation, but we use ~0 to make it fairly
+ * unambiguous with actual user (non-texture) renderbuffers.
+ */
+void
+_mesa_update_texture_renderbuffer(struct gl_context *ctx,
+                                  struct gl_framebuffer *fb,
+                                  struct gl_renderbuffer_attachment *att)
+{
+   struct gl_texture_image *texImage;
+   struct gl_renderbuffer *rb;
+
+   texImage = _mesa_get_attachment_teximage(att);
+   if (!texImage)
+      return;
+
+   rb = att->Renderbuffer;
+   if (!rb) {
+      rb = ctx->Driver.NewRenderbuffer(ctx, ~0);
+      if (!rb) {
+         _mesa_error(ctx, GL_OUT_OF_MEMORY, "glFramebufferTexture()");
+         return;
+      }
+      _mesa_reference_renderbuffer(&att->Renderbuffer, rb);
+
+      /* This can't get called on a texture renderbuffer, so set it to NULL
+       * for clarity compared to user renderbuffers.
+       */
+      rb->AllocStorage = NULL;
+   }
+
+   ctx->Driver.RenderTexture(ctx, fb, att);
+}
 
 /**
  * Bind a texture object to an attachment point.
@@ -369,6 +410,7 @@ _mesa_set_texture_attachment(struct gl_context *ctx,
       assert(!att->Texture);
       _mesa_reference_texobj(&att->Texture, texObj);
    }
+   invalidate_framebuffer(fb);
 
    /* always update these fields */
    att->TextureLevel = level;
@@ -377,11 +419,7 @@ _mesa_set_texture_attachment(struct gl_context *ctx,
    att->Layered = layered;
    att->Complete = GL_FALSE;
 
-   if (_mesa_get_attachment_teximage(att)) {
-      ctx->Driver.RenderTexture(ctx, fb, att);
-   }
-
-   invalidate_framebuffer(fb);
+   _mesa_update_texture_renderbuffer(ctx, fb, att);
 }