From 3ce28342a29610da7652247e2ec5b6b9176e5e4f Mon Sep 17 00:00:00 2001
From: ReinUsesLisp <reinuseslisp@airmail.cc>
Date: Tue, 21 Jan 2020 19:08:08 -0300
Subject: [PATCH] gl_shader_cache: Disable fastmath on Nvidia
---
src/video_core/renderer_opengl/gl_shader_cache.cpp | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/src/video_core/renderer_opengl/gl_shader_cache.cpp b/src/video_core/renderer_opengl/gl_shader_cache.cpp
index a4acb3796f..3c5bdd377c 100644
--- a/src/video_core/renderer_opengl/gl_shader_cache.cpp
+++ b/src/video_core/renderer_opengl/gl_shader_cache.cpp
@@ -260,6 +260,10 @@ CachedProgram BuildShader(const Device& device, u64 unique_identifier, ShaderTyp
"#extension GL_NV_shader_thread_group : require\n"
"#extension GL_NV_shader_thread_shuffle : require\n";
}
+ // This pragma stops Nvidia's driver from over optimizing math (probably using fp16 operations)
+ // on places where we don't want to.
+ // Thanks to Ryujinx for finding this workaround.
+ source += "#pragma optionNV(fastmath off)\n";
if (shader_type == ShaderType::Geometry) {
const auto [glsl_topology, max_vertices] = GetPrimitiveDescription(variant.primitive_mode);