From bf9177a31943fd4637778317c8d4f06ec9df39c3 Mon Sep 17 00:00:00 2001
From: Egor Yusov <egor.yusov@gmail.com>
Date: Sat, 14 Apr 2018 21:57:19 -0700
Subject: Added vulkan shader module creation

---
 Graphics/GLSLTools/include/GLSLSourceBuilder.h | 8 +++++++-
 Graphics/GLSLTools/src/GLSL2SPIRV.cpp          | 4 +++-
 Graphics/GLSLTools/src/GLSLSourceBuilder.cpp   | 9 ++++++++-
 3 files changed, 18 insertions(+), 3 deletions(-)

(limited to 'Graphics/GLSLTools')

diff --git a/Graphics/GLSLTools/include/GLSLSourceBuilder.h b/Graphics/GLSLTools/include/GLSLSourceBuilder.h
index c0ab5a7d..572ea180 100644
--- a/Graphics/GLSLTools/include/GLSLSourceBuilder.h
+++ b/Graphics/GLSLTools/include/GLSLSourceBuilder.h
@@ -29,6 +29,12 @@
 namespace Diligent
 {
     
-String BuildGLSLSourceString(const ShaderCreationAttribs &CreationAttribs);
+enum TargetGLSLCompiler
+{
+    glslang,
+    driver
+};
+
+String BuildGLSLSourceString(const ShaderCreationAttribs &CreationAttribs, TargetGLSLCompiler TargetCompiler);
 
 }
\ No newline at end of file
diff --git a/Graphics/GLSLTools/src/GLSL2SPIRV.cpp b/Graphics/GLSLTools/src/GLSL2SPIRV.cpp
index e36a3196..69cadd2c 100644
--- a/Graphics/GLSLTools/src/GLSL2SPIRV.cpp
+++ b/Graphics/GLSLTools/src/GLSL2SPIRV.cpp
@@ -201,7 +201,9 @@ std::vector<unsigned int> GLSLtoSPIRV(const SHADER_TYPE ShaderType, const char *
     const char *ShaderStrings[] = { ShaderSource };
     Shader.setStrings(ShaderStrings, 1);
     
-    if (!Shader.parse(&Resources, 100, false, messages)) 
+    Shader.setAutoMapBindings(true);
+    Shader.setAutoMapLocations(true);
+    if (!Shader.parse(&Resources, 100, false, messages))
     {
         LOG_ERROR_MESSAGE("Failed to parse shader source: \n", Shader.getInfoLog(), '\n', Shader.getInfoDebugLog());
         return std::move(spirv);
diff --git a/Graphics/GLSLTools/src/GLSLSourceBuilder.cpp b/Graphics/GLSLTools/src/GLSLSourceBuilder.cpp
index 064f18aa..f9140a53 100644
--- a/Graphics/GLSLTools/src/GLSLSourceBuilder.cpp
+++ b/Graphics/GLSLTools/src/GLSLSourceBuilder.cpp
@@ -32,7 +32,7 @@
 namespace Diligent
 {
 
-String BuildGLSLSourceString(const ShaderCreationAttribs &CreationAttribs)
+String BuildGLSLSourceString(const ShaderCreationAttribs &CreationAttribs, TargetGLSLCompiler TargetCompiler)
 {
     String GLSLSource;
 
@@ -169,6 +169,13 @@ String BuildGLSLSourceString(const ShaderCreationAttribs &CreationAttribs)
         "layout(std140) uniform;\n"
     );
 
+    if(ShaderType == SHADER_TYPE_VERTEX && TargetCompiler == TargetGLSLCompiler::glslang)
+    {
+        // https://github.com/KhronosGroup/GLSL/blob/master/extensions/khr/GL_KHR_vulkan_glsl.txt
+        GLSLSource.append("#define gl_VertexID gl_VertexIndex\n"
+                          "#define gl_InstanceID gl_InstanceIndex\n");
+    }
+
     const Char* ShaderTypeDefine = nullptr;
     switch (ShaderType)
     {
-- 
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