On 29 August 2012 02:30, Kenneth Graunke <<a href="mailto:kenneth@whitecape.org" target="_blank">kenneth@whitecape.org</a>> wrote: <div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"> Prior to commit 2f1869822, emit_fb_writes() looped from 0 to 3, writing all four components of a vec4 color output. However, that broke for smaller output types (float, vec2, or vec3). To fix that, I introduced a new variable (output_components[]) containing the size of the output type for each render target. Unfortunately, I forgot to actually initialize it in the constructor, which meant that unless a shader wrote to gl_FragColor, or the specific output for each render target, output_components would contain a garbage value, and we'd loop for a completely non-deterministic amount of time. Not actually emitting any color writes seems like the right approach. We may still need to emit a render target write (to terminate the thread), but don't have to put in any sensible values (the shader didn't write anything, after all). Fixes a regression since 2f18698220d8b27991fab550c4721590d17278e0. NOTE: This is a candidate for stable release branches. Bugzilla: <a href="https://bugs.freedesktop.org/show_bug.cgi?id=54193" target="_blank">https://bugs.freedesktop.org/show_bug.cgi?id=54193</a> Signed-off-by: Kenneth Graunke <<a href="mailto:kenneth@whitecape.org">kenneth@whitecape.org</a>> </blockquote><div> Reviewed-by: Paul Berry <<a href="mailto:stereotype441@gmail.com">stereotype441@gmail.com</a>> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"> --- src/mesa/drivers/dri/i965/brw_fs_visitor.cpp | 1 + 1 file changed, 1 insertion(+) diff --git a/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp b/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp index e8f64b2..d3cbde3 100644 --- a/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp +++ b/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp @@ -2277,6 +2277,7 @@ fs_visitor::fs_visitor(struct brw_wm_compile *c, struct gl_shader_program *prog, this->frag_depth = NULL; memset(this->outputs, 0, sizeof(this->outputs)); + memset(this->output_components, 0, sizeof(this->output_components)); this->first_non_payload_grf = 0; this->max_grf = intel->gen >= 7 ? GEN7_MRF_HACK_START : BRW_MAX_GRF; -- 1.7.11.4 _______________________________________________ mesa-dev mailing list <a href="mailto:mesa-dev@lists.freedesktop.org">mesa-dev@lists.freedesktop.org</a> <a href="http://lists.freedesktop.org/mailman/listinfo/mesa-dev" target="_blank">http://lists.freedesktop.org/mailman/listinfo/mesa-dev</a> </blockquote></div>