v3dv: add a note on interactions between clearing and scissor
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6766>
diff --git a/src/broadcom/vulkan/v3dv_cmd_buffer.c b/src/broadcom/vulkan/v3dv_cmd_buffer.c
index 09e7a7a..35fb0be 100644
--- a/src/broadcom/vulkan/v3dv_cmd_buffer.c
+++ b/src/broadcom/vulkan/v3dv_cmd_buffer.c
@@ -820,6 +820,12 @@
}
}
+ /* FIXME: the tile buffer clears don't seem to honor the scissor rect
+ * so if the current combination of scissor + renderArea doesn't cover
+ * the full extent of the render target we won't get correct behavior.
+ * We probably need to detect these cases, implement the clearing by
+ * drawing a rect and skip clearing here.
+ */
cl_emit(rcl, TILE_RENDERING_MODE_CFG_CLEAR_COLORS_PART1, clear) {
clear.clear_color_low_32_bits = clear_color[0];
clear.clear_color_next_24_bits = clear_color[1] & 0xffffff;
