gistfile1.cpp

std::string PreprocessGLES3Shader (const std::string& source, bool autoNormalizeNormals, bool fullVertexShaderPreprocess)
{
  std::string remainder1, remainder2;
	std::string	vertexShaderSource = ExtractDefineBlock (source, "VERTEX", &remainder1);
	std::string	fragmentShaderSource = ExtractDefineBlock (remainder1, "FRAGMENT", &remainder2);

	if (fullVertexShaderPreprocess)
		vertexShaderSource = PreprocessGLESVertexShader (vertexShaderSource, kShaderAPIGLES3, autoNormalizeNormals);

	vertexShaderSource = PreprocessVertexShader(vertexShaderSource, autoNormalizeNormals);
	fragmentShaderSource = PreprocessFragmentShader(fragmentShaderSource);

	std::string output =   "#version 300 es\n"
						 + remainder2
						 + "\n#ifdef VERTEX\n"
						 + vertexShaderSource
						 + "\n#endif\n#ifdef FRAGMENT\n"
						 + fragmentShaderSource
						 + "\n#endif";

	return output;
}

std::string PreprocessGLSLShader (const std::string& source)
{
	// OpenGL has no precision types, let's remove them

	std::string prefix = "#define highp\n#define mediump\n#define lowp\n";
	return prefix + source;
}