From 16da454e746a5d1490eb4a83e0fff8276e397990 Mon Sep 17 00:00:00 2001
From: Egor Yusov <egor.yusov@gmail.com>
Date: Wed, 13 Nov 2019 20:14:39 -0800
Subject: Vulkan backend: added SPIRV optimization when compiling from glsl

---
 Graphics/GLSLTools/src/SPIRVUtils.cpp | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

(limited to 'Graphics/GLSLTools')

diff --git a/Graphics/GLSLTools/src/SPIRVUtils.cpp b/Graphics/GLSLTools/src/SPIRVUtils.cpp
index c7af932b..2fb68209 100644
--- a/Graphics/GLSLTools/src/SPIRVUtils.cpp
+++ b/Graphics/GLSLTools/src/SPIRVUtils.cpp
@@ -518,7 +518,20 @@ std::vector<unsigned int> GLSLtoSPIRV(const SHADER_TYPE ShaderType, const char*
     int         Lenghts[]       = {SourceCodeLen};
     Shader.setStringsWithLengths(ShaderStrings, Lenghts, 1);
     
-    return CompileShaderInternal(Shader, messages, nullptr, ShaderSource, SourceCodeLen, ppCompilerOutput);
+    auto SPIRV = CompileShaderInternal(Shader, messages, nullptr, ShaderSource, SourceCodeLen, ppCompilerOutput);
+    
+    spvtools::Optimizer SpirvOptimizer(SPV_ENV_VULKAN_1_0);
+    SpirvOptimizer.RegisterPerformancePasses();
+    std::vector<uint32_t> OptimizedSPIRV;    
+    if (SpirvOptimizer.Run(SPIRV.data(), SPIRV.size(), &OptimizedSPIRV))
+    {
+        return std::move(OptimizedSPIRV);
+    }
+    else
+    {
+        LOG_ERROR("Failed to optimize SPIR-V.");
+        return std::move(SPIRV);
+    }
 }
 
 }
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