nir/lower_wpos_center: support adding sample position to fragment coordinate

According to section 14.6 of the Vulkan specification:

   "When sample shading is enabled, the x and y components of FragCoord
    reflect the location of the sample corresponding to the shader
    invocation."

So add a boolean parameter to the lowering pass to select this behavior
when we need it.

Reviewed-by: Jason Ekstrand <[email protected]>

1 files changed, 1 insertions, 1 deletions

diff --git a/src/compiler/nir/nir.h b/src/compiler/nir/nir.h
index d032787a2a0..f88707a31a0 100644
--- a/src/compiler/nir/nir.h
+++ b/src/compiler/nir/nir.h
@@ -2518,7 +2518,7 @@ typedef struct nir_lower_wpos_ytransform_options {
 
 bool nir_lower_wpos_ytransform(nir_shader *shader,
                                const nir_lower_wpos_ytransform_options *options);
-bool nir_lower_wpos_center(nir_shader *shader);
+bool nir_lower_wpos_center(nir_shader *shader, const bool for_sample_shading);
 
 typedef struct nir_lower_drawpixels_options {
    int texcoord_state_tokens[5];