- mask & BUFFER_BIT_DEPTH,
- mask & BUFFER_BIT_STENCIL);
- } else if (clear_buffers)
- ctx->st->pipe->clear(ctx->st->pipe, clear_buffers, ctx->Color.ClearColor,
- ctx->Depth.Clear, ctx->Stencil.Clear);
-
+ quad_buffers & PIPE_CLEAR_DEPTH,
+ quad_buffers & PIPE_CLEAR_STENCIL);
+ } else if (clear_buffers) {
+ /* driver cannot know it can clear everything if the buffer
+ * is a combined depth/stencil buffer but this wasn't actually
+ * required from the visual. Hence fix this up to avoid potential
+ * read-modify-write in the driver.
+ */
+ if ((clear_buffers & PIPE_CLEAR_DEPTHSTENCIL) &&
+ ((clear_buffers & PIPE_CLEAR_DEPTHSTENCIL) != PIPE_CLEAR_DEPTHSTENCIL) &&
+ (depthRb == stencilRb) &&
+ (ctx->DrawBuffer->Visual.depthBits == 0 ||
+ ctx->DrawBuffer->Visual.stencilBits == 0))
+ clear_buffers |= PIPE_CLEAR_DEPTHSTENCIL;
+ st->pipe->clear(st->pipe, clear_buffers, ctx->Color.ClearColor,
+ ctx->Depth.Clear, ctx->Stencil.Clear);
+ }