This is a no-op if the platform supports coherent framebuffer fetch,
-- If it doesn't we just need to flush the render cache and invalidate
the texture cache in order for previous rendering to be visible to
framebuffer fetch.
---
src/mesa/drivers/dri/i965/brw_program.c | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/src/mesa/drivers/dri/i965/brw_program.c
b/src/mesa/drivers/dri/i965/brw_program.c
index 7785490..5b246d3 100644
--- a/src/mesa/drivers/dri/i965/brw_program.c
+++ b/src/mesa/drivers/dri/i965/brw_program.c
@@ -310,6 +310,25 @@ brw_memory_barrier(struct gl_context *ctx, GLbitfield
barriers)
brw_emit_pipe_control_flush(brw, bits);
}
+static void
+brw_blend_barrier(struct gl_context *ctx)
+{
+ struct brw_context *brw = brw_context(ctx);
+
+ if (!ctx->Extensions.MESA_shader_framebuffer_fetch) {
+ if (brw->gen >= 6) {
+ brw_emit_pipe_control_flush(brw,
+ PIPE_CONTROL_RENDER_TARGET_FLUSH |
+ PIPE_CONTROL_CS_STALL);
+ brw_emit_pipe_control_flush(brw,
+ PIPE_CONTROL_TEXTURE_CACHE_INVALIDATE);
+ } else {
+ brw_emit_pipe_control_flush(brw,
+ PIPE_CONTROL_RENDER_TARGET_FLUSH);
+ }
+ }
+}
+
void
brw_add_texrect_params(struct gl_program *prog)
{
@@ -379,6 +398,7 @@ void brwInitFragProgFuncs( struct dd_function_table
*functions )
functions->LinkShader = brw_link_shader;
functions->MemoryBarrier = brw_memory_barrier;
+ functions->BlendBarrier = brw_blend_barrier;
}
struct shader_times {
--
2.9.0
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