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shader.cpp

@@ -0,0 +1,94 @@
+#include "shader.hpp"
+
+GLuint LoadShaders(const char * vertex_file_path, const char * fragment_file_path) {
+
+	// Create the shaders
+	GLuint VertexShaderID = glCreateShader(GL_VERTEX_SHADER);
+	GLuint FragmentShaderID = glCreateShader(GL_FRAGMENT_SHADER);
+
+	// Read the Vertex Shader code from the file
+	std::string VertexShaderCode;
+	std::ifstream VertexShaderStream(vertex_file_path, std::ios::in);
+	if (VertexShaderStream.is_open()) {
+		std::stringstream sstr;
+		sstr << VertexShaderStream.rdbuf();
+		VertexShaderCode = sstr.str();
+		VertexShaderStream.close();
+	} else {
+		timestampedCout("shader.cpp: Impossible to open " << vertex_file_path << ". Are you in the right directory?");
+		return 0;
+	}
+
+	// Read the Fragment Shader code from the file
+	std::string FragmentShaderCode;
+	std::ifstream FragmentShaderStream(fragment_file_path, std::ios::in);
+	if(FragmentShaderStream.is_open()){
+		std::stringstream sstr;
+		sstr << FragmentShaderStream.rdbuf();
+		FragmentShaderCode = sstr.str();
+		FragmentShaderStream.close();
+	}
+
+	GLint Result = GL_FALSE;
+	int InfoLogLength;
+
+
+	// Compile Vertex Shader
+	timestampedCout("shader.cpp: Compiling shader: " << vertex_file_path << "...");
+	char const * VertexSourcePointer = VertexShaderCode.c_str();
+	glShaderSource(VertexShaderID, 1, &VertexSourcePointer , NULL);
+	glCompileShader(VertexShaderID);
+
+	// Check Vertex Shader
+	glGetShaderiv(VertexShaderID, GL_COMPILE_STATUS, &Result);
+	glGetShaderiv(VertexShaderID, GL_INFO_LOG_LENGTH, &InfoLogLength);
+	if (InfoLogLength > 0) {
+		std::vector<char> VertexShaderErrorMessage(InfoLogLength + 1);
+		glGetShaderInfoLog(VertexShaderID, InfoLogLength, NULL, &VertexShaderErrorMessage[0]);
+		timestampedCout("shader.cpp: VertexErrorMessage " << &VertexShaderErrorMessage[0]);
+	}
+
+
+
+	// Compile Fragment Shader
+	timestampedCout("shader.cpp: Compiling shader: " << fragment_file_path << "...");
+	char const * FragmentSourcePointer = FragmentShaderCode.c_str();
+	glShaderSource(FragmentShaderID, 1, &FragmentSourcePointer , NULL);
+	glCompileShader(FragmentShaderID);
+
+	// Check Fragment Shader
+	glGetShaderiv(FragmentShaderID, GL_COMPILE_STATUS, &Result);
+	glGetShaderiv(FragmentShaderID, GL_INFO_LOG_LENGTH, &InfoLogLength);
+	if (InfoLogLength > 0) {
+		std::vector<char> FragmentShaderErrorMessage(InfoLogLength + 1);
+		glGetShaderInfoLog(FragmentShaderID, InfoLogLength, NULL, &FragmentShaderErrorMessage[0]);
+		timestampedCout("shader.cpp: FragmentShaderErrorMessage " << &FragmentShaderErrorMessage[0]);
+	}
+
+
+
+	// Link the program
+	timestampedCout("shader.cpp: Linking program...");
+	GLuint ProgramID = glCreateProgram();
+	glAttachShader(ProgramID, VertexShaderID);
+	glAttachShader(ProgramID, FragmentShaderID);
+	glLinkProgram(ProgramID);
+
+	// Check the program
+	glGetProgramiv(ProgramID, GL_LINK_STATUS, &Result);
+	glGetProgramiv(ProgramID, GL_INFO_LOG_LENGTH, &InfoLogLength);
+	if (InfoLogLength > 0){
+		std::vector<char> ProgramErrorMessage(InfoLogLength + 1);
+		glGetProgramInfoLog(ProgramID, InfoLogLength, NULL, &ProgramErrorMessage[0]);
+		timestampedCout("shader.cpp: ProgramErrorMessage " << &ProgramErrorMessage[0]);
+	}
+
+	
+	glDetachShader(ProgramID, VertexShaderID);
+	glDetachShader(ProgramID, FragmentShaderID);
+	
+	glDeleteShader(VertexShaderID);
+	glDeleteShader(FragmentShaderID);
+
+	return ProgramID;
+}