Mesa (main): microsoft/spirv_to_dxil: Allow forcing per-sample shading

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Module: Mesa
Branch: main
Commit: 80a5deee620cfee7a8d1f63ef1b2b1736995895b
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=80a5deee620cfee7a8d1f63ef1b2b1736995895b

Author: Boris Brezillon <boris.brezillon at collabora.com>
Date:   Wed Apr 13 02:14:36 2022 -0700

microsoft/spirv_to_dxil: Allow forcing per-sample shading

Needed to support VkPipelineMultisampleStateCreateInfo::sampleShadingEnable.

Reviewed-by: Erik Faye-Lund <erik.faye-lund at collabora.com>
Reviewed-by: Jesse Natalie <jenatali at microsoft.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/15916>

---

 src/microsoft/spirv_to_dxil/spirv_to_dxil.c | 7 +++++++
 src/microsoft/spirv_to_dxil/spirv_to_dxil.h | 3 +++
 2 files changed, 10 insertions(+)

diff --git a/src/microsoft/spirv_to_dxil/spirv_to_dxil.c b/src/microsoft/spirv_to_dxil/spirv_to_dxil.c
index d02b6e1cbc1..7539678072b 100644
--- a/src/microsoft/spirv_to_dxil/spirv_to_dxil.c
+++ b/src/microsoft/spirv_to_dxil/spirv_to_dxil.c
@@ -565,6 +565,13 @@ spirv_to_dxil(const uint32_t *words, size_t word_count,
 
    NIR_PASS_V(nir, nir_lower_system_values);
 
+   // Force sample-rate shading if we're asked to.
+   if (conf->force_sample_rate_shading) {
+      assert(stage == MESA_SHADER_FRAGMENT);
+      nir_foreach_shader_in_variable(var, nir)
+         var->data.sample = true;
+   }
+
    if (conf->zero_based_vertex_instance_id) {
       // vertex_id and instance_id should have already been transformed to
       // base zero before spirv_to_dxil was called. Therefore, we can zero out
diff --git a/src/microsoft/spirv_to_dxil/spirv_to_dxil.h b/src/microsoft/spirv_to_dxil/spirv_to_dxil.h
index f53a5445bc5..cad69ef425c 100644
--- a/src/microsoft/spirv_to_dxil/spirv_to_dxil.h
+++ b/src/microsoft/spirv_to_dxil/spirv_to_dxil.h
@@ -165,6 +165,9 @@ struct dxil_spirv_runtime_conf {
    // The caller supports read-only images to be turned into SRV accesses,
    // which allows us to run the nir_opt_access() pass
    bool read_only_images_as_srvs;
+
+   // Force sample rate shading on a fragment shader
+   bool force_sample_rate_shading;
 };
 
 struct dxil_spirv_debug_options {