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nir: add rcp(w) lowering for gl_FragCoord

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On some hardware (e.g. Mali400) the shader needs to apply some
transformations for correct gl_FragCoord handling. The lowering
actions look like the following in pseudocode:
   gl_FragCoord.xyz = gl_FragCoord_orig.xyz
   gl_FragCoord.w = 1.0 / gl_FragCoord_orig.w

Add this lowering as a nir pass in preparation for using it in the driver.

Signed-off-by: Andreas Baierl <ichgeh@imkreisrum.de>
Reviewed-by: Qiang Yu <yuq825@gmail.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Andreas Baierl
2019-04-26 15:01:43 +02:00
committed by Qiang Yu
parent 7050eccd77
commit b82de2b4d7
4 changed files with 84 additions and 0 deletions
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src/compiler/nir/nir.h
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@@ -3159,6 +3159,7 @@ void nir_lower_io_to_scalar(nir_shader *shader, nir_variable_mode mask);
void nir_lower_io_to_scalar_early(nir_shader *shader, nir_variable_mode mask);
bool nir_lower_io_to_vector(nir_shader *shader, nir_variable_mode mask);
void nir_lower_fragcoord_wtrans(nir_shader *shader);
void nir_lower_viewport_transform(nir_shader *shader);
bool nir_lower_uniforms_to_ubo(nir_shader *shader, int multiplier);