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radeonsi/gfx10: support pixel shaders without exports 

It only works if there are not color and no Z exports.

Acked-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Acked-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Marek Olšák 2019-06-26 22:57:10 -04:00
parent 2adc8e2736
commit fbf781e401
1 changed files with 8 additions and 1 deletions
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9
src/gallium/drivers/radeonsi/si_state_shaders.c
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@ -1587,8 +1587,15 @@ static void si_shader_ps(struct si_screen *sscreen, struct si_shader *shader)
* stalls without this setting.
*
* Don't add this to CB_SHADER_MASK.
*
* GFX10 supports pixel shaders without exports by setting both
* the color and Z formats to SPI_SHADER_ZERO. The hw will skip export
* instructions if any are present.
*/
if (!spi_shader_col_format &&
if ((sscreen->info.chip_class <= GFX9 ||
info->uses_kill ||
shader->key.part.ps.epilog.alpha_func != PIPE_FUNC_ALWAYS) &&
!spi_shader_col_format &&
!info->writes_z && !info->writes_stencil && !info->writes_samplemask)
spi_shader_col_format = V_028714_SPI_SHADER_32_R;