Mesa (main): radv: do not enable per-vertex VRS if the FS uses gl_FragCoord

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Module: Mesa
Branch: main
Commit: 377884c9c800164ac6e791241ef8c621f205a0d3
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=377884c9c800164ac6e791241ef8c621f205a0d3

Author: Samuel Pitoiset <samuel.pitoiset at gmail.com>
Date:   Fri Feb 11 16:46:56 2022 +0100

radv: do not enable per-vertex VRS if the FS uses gl_FragCoord

It breaks postprocessing in some games like Ghostrunner, Deathloop,
Street Fighter V.

Signed-off-by: Samuel Pitoiset <samuel.pitoiset at gmail.com>
Reviewed-by: Timur Kristóf <timur.kristof at gmail.com>
Reviewed-by: Bas Nieuwenhuizen <bas at basnieuwenhuizen.nl>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/15042>

---

 src/amd/vulkan/radv_pipeline.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/amd/vulkan/radv_pipeline.c b/src/amd/vulkan/radv_pipeline.c
index ea22e9c7250..d0bdc85ad20 100644
--- a/src/amd/vulkan/radv_pipeline.c
+++ b/src/amd/vulkan/radv_pipeline.c
@@ -3677,6 +3677,12 @@ radv_consider_force_vrs(const struct radv_pipeline *pipeline, bool noop_fs, nir_
    if (noop_fs)
       return false;
 
+   /* Do not enable if the PS uses gl_FragCoord because it breaks postprocessing in some games. */
+   if (nir[MESA_SHADER_FRAGMENT] &&
+       BITSET_TEST(nir[MESA_SHADER_FRAGMENT]->info.system_values_read, SYSTEM_VALUE_FRAG_COORD)) {
+      return false;
+   }
+
    return true;
 }