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amd/common: add ac_vgt_gs_mode() helper

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Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
This commit is contained in:
Samuel Pitoiset
2017-12-15 15:37:19 +01:00
parent 55f8431c76
commit 79b34d0832
4 changed files with 42 additions and 55 deletions
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27
src/amd/common/ac_shader_util.c
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@@ -78,3 +78,30 @@ ac_get_cb_shader_mask(unsigned spi_shader_col_format)
}
return cb_shader_mask;
}
/**
* Calculate the appropriate setting of VGT_GS_MODE when \p shader is a
* geometry shader.
*/
uint32_t
ac_vgt_gs_mode(unsigned gs_max_vert_out, enum chip_class chip_class)
{
unsigned cut_mode;
if (gs_max_vert_out <= 128) {
cut_mode = V_028A40_GS_CUT_128;
} else if (gs_max_vert_out <= 256) {
cut_mode = V_028A40_GS_CUT_256;
} else if (gs_max_vert_out <= 512) {
cut_mode = V_028A40_GS_CUT_512;
} else {
assert(gs_max_vert_out <= 1024);
cut_mode = V_028A40_GS_CUT_1024;
}
return S_028A40_MODE(V_028A40_GS_SCENARIO_G) |
S_028A40_CUT_MODE(cut_mode)|
S_028A40_ES_WRITE_OPTIMIZE(chip_class <= VI) |
S_028A40_GS_WRITE_OPTIMIZE(1) |
S_028A40_ONCHIP(chip_class >= GFX9 ? 1 : 0);
}