On Sat, Dec 20, 2014 at 8:11 AM, Rob Clark <robdcl...@gmail.com> wrote:
> @@ -1452,6 +1593,20 @@ tgsi_transform_lowering(const struct
> tgsi_lowering_config *config,
> }
> }
>
> + if ((info->processor == TGSI_PROCESSOR_FRAGMENT) &&
> + config->lower_alpha_test &&
> + (config->alpha_func != PIPE_FUNC_ALWAYS)) {
> + int i;
> + ctx.alpha_test = true;
> + for (i = 0; i < info->file_max[TGSI_FILE_OUTPUT]; i++) {
> + /* TODO not sure what to do in case of MRT */
> + if (info->output_semantic_name[i] == TGSI_SEMANTIC_COLOR) {
> + ctx.colorout = i;
> + break;
In the MRT case, alpha test should be based on the value written to
color output 0.
There's a piglit test for this --
tests/spec/arb_draw_buffers/fbo-mrt-alphatest -- since old Intel
hardware has to a similar lowering.
-Chris
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