intel: Use a system value for gl_FragCoord

It's kind-of an anomaly that the Intel drivers are still treating
gl_FragCoord as an input.  It also makes zero sense because we have to
special-case it in the back-end.

Because ANV is the only user of nir_lower_wpos_center, we go ahead and
just update it to look for nir_intrinsic_load_frag_coord as part of this
patch.

Reviewed-by: Kenneth Graunke <[email protected]>

1 files changed, 2 insertions, 1 deletions

diff --git a/src/intel/vulkan/anv_pipeline.c b/src/intel/vulkan/anv_pipeline.c
index c2a164cc802..a9a403f1233 100644
--- a/src/intel/vulkan/anv_pipeline.c
+++ b/src/intel/vulkan/anv_pipeline.c
@@ -167,6 +167,7 @@ anv_shader_compile_to_nir(struct anv_device *device,
    };
    struct spirv_to_nir_options spirv_options = {
       .lower_workgroup_access_to_offsets = true,
+      .frag_coord_is_sysval = true,
       .caps = {
          .demote_to_helper_invocation = true,
          .derivative_group = true,
@@ -652,7 +653,7 @@ anv_pipeline_lower_nir(struct anv_pipeline *pipeline,
 
    if (nir->info.stage == MESA_SHADER_FRAGMENT) {
       NIR_PASS_V(nir, nir_lower_wpos_center, pipeline->sample_shading_enable);
-      NIR_PASS_V(nir, nir_lower_input_attachments, false);
+      NIR_PASS_V(nir, nir_lower_input_attachments, true);
    }
 
    NIR_PASS_V(nir, anv_nir_lower_ycbcr_textures, layout);