From 3b339fbbf65a50ec2ec8baacd175ca7577c3b8bd Mon Sep 17 00:00:00 2001
From: ameerj <52414509+ameerj@users.noreply.github.com>
Date: Mon, 14 Jun 2021 23:33:26 -0400
Subject: glsl: Conditionally use fine/coarse derivatives based on device
 support

---
 .../backend/glsl/emit_glsl_warp.cpp                | 28 ++++++++++++++++++----
 1 file changed, 24 insertions(+), 4 deletions(-)

(limited to 'src/shader_recompiler/backend/glsl/emit_glsl_warp.cpp')

diff --git a/src/shader_recompiler/backend/glsl/emit_glsl_warp.cpp b/src/shader_recompiler/backend/glsl/emit_glsl_warp.cpp
index 4d418cbbc..a982dd8a2 100644
--- a/src/shader_recompiler/backend/glsl/emit_glsl_warp.cpp
+++ b/src/shader_recompiler/backend/glsl/emit_glsl_warp.cpp
@@ -180,18 +180,38 @@ void EmitFSwizzleAdd(EmitContext& ctx, IR::Inst& inst, std::string_view op_a, st
 }
 
 void EmitDPdxFine(EmitContext& ctx, IR::Inst& inst, std::string_view op_a) {
-    ctx.AddF32("{}=dFdxFine({});", inst, op_a);
+    if (ctx.profile.support_gl_derivative_control) {
+        ctx.AddF32("{}=dFdxFine({});", inst, op_a);
+    } else {
+        LOG_WARNING(Shader_GLSL, "Device does not support dFdxFine, fallback to dFdx");
+        ctx.AddF32("{}=dFdx({});", inst, op_a);
+    }
 }
 
 void EmitDPdyFine(EmitContext& ctx, IR::Inst& inst, std::string_view op_a) {
-    ctx.AddF32("{}=dFdyFine({});", inst, op_a);
+    if (ctx.profile.support_gl_derivative_control) {
+        ctx.AddF32("{}=dFdyFine({});", inst, op_a);
+    } else {
+        LOG_WARNING(Shader_GLSL, "Device does not support dFdyFine, fallback to dFdy");
+        ctx.AddF32("{}=dFdy({});", inst, op_a);
+    }
 }
 
 void EmitDPdxCoarse(EmitContext& ctx, IR::Inst& inst, std::string_view op_a) {
-    ctx.AddF32("{}=dFdxCoarse({});", inst, op_a);
+    if (ctx.profile.support_gl_derivative_control) {
+        ctx.AddF32("{}=dFdxCoarse({});", inst, op_a);
+    } else {
+        LOG_WARNING(Shader_GLSL, "Device does not support dFdxCoarse, fallback to dFdx");
+        ctx.AddF32("{}=dFdx({});", inst, op_a);
+    }
 }
 
 void EmitDPdyCoarse(EmitContext& ctx, IR::Inst& inst, std::string_view op_a) {
-    ctx.AddF32("{}=dFdyCoarse({});", inst, op_a);
+    if (ctx.profile.support_gl_derivative_control) {
+        ctx.AddF32("{}=dFdyCoarse({});", inst, op_a);
+    } else {
+        LOG_WARNING(Shader_GLSL, "Device does not support dFdyCoarse, fallback to dFdy");
+        ctx.AddF32("{}=dFdy({});", inst, op_a);
+    }
 }
 } // namespace Shader::Backend::GLSL
-- 
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