Compile GLSL in a critical section

src/OpenGL/libGLESv2/Shader.cpp

@@ -26,6 +26,7 @@
 
 namespace es2
 {
+std::mutex Shader::mutex;
 bool Shader::compilerInitialized = false;
 
 Shader::Shader(ResourceManager *manager, GLuint handle) : mHandle(handle), mResourceManager(manager)
@@ -206,6 +207,9 @@ void Shader::clear()
 
 void Shader::compile()
 {
+	// Our version of glslang is not thread safe.
+	std::lock_guard<std::mutex> lock(mutex);
+
 	clear();
 
 	createShader();
@@ -295,6 +299,9 @@ void Shader::flagForDeletion()
 
 void Shader::releaseCompiler()
 {
+	// Our version of glslang is not thread safe.
+	std::lock_guard<std::mutex> lock(mutex);
+
 	FreeCompilerGlobals();
 	compilerInitialized = false;
 }

src/OpenGL/libGLESv2/Shader.h

@@ -28,6 +28,7 @@
 
 #include <string>
 #include <list>
+#include <mutex>
 #include <vector>
 
 namespace glsl
@@ -69,7 +70,9 @@ public:
 	static void releaseCompiler();
 
 protected:
+	static std::mutex mutex;
 	static bool compilerInitialized;
+
 	TranslatorASM *createCompiler(GLenum shaderType);
 	void clear();