On Fri, Dec 19, 2014 at 5:18 PM, Chris Forbes <chr...@ijw.co.nz> wrote:
> 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.
>
ahh, great, then it should be right the way I have it.. some day I'll
actually get around to implementing MRT so I can test it ;-)
BR,
-R
> -Chris
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