void Program::link()
{
glLinkProgram(program);
GL_CHECK_ERROR();
if (programLinkStatus(program) == false)
throw error("error linking program: " + programInfoLog(program));
}
bool Shader::load(const std::string name, const char* vertexFilename, const char* fragmentFilename)
{
m_name = name;
GLint success = 0;
//here we create a vertex shader and set the shader source
m_vertexShader = loadShader(vertexFilename, GL_VERTEX_SHADER);
//next compile the vertex shader
glCompileShader(m_vertexShader);
//check if it compiled ok.
glGetShaderiv(m_vertexShader, GL_COMPILE_STATUS, &success);
if(!success)
{
std::cout << std::endl << "Error compiling GLSL vertex shader: '" << vertexFilename << "'" << std::endl << std::endl;
std::cout << "Shader info log:" << std::endl << shaderInfoLog(m_vertexShader) << std::endl;
return false;
}
else
{
//create a fragment shader and set the shader source
m_fragmentShader = loadShader(fragmentFilename, GL_FRAGMENT_SHADER);
//compile the fragment shader
glCompileShader(m_fragmentShader);
//check for any compiling errors
glGetShaderiv(m_fragmentShader, GL_COMPILE_STATUS, &success);
if(!success)
{
std::cout << std::endl << "Error compiling GLSL fragment shader: '" << fragmentFilename << "'" << std::endl << std::endl;
std::cout << "Shader info log:" << std::endl << shaderInfoLog(m_fragmentShader) << std::endl;
return false;
}
else
{
//create the program
m_programObject = glCreateProgram();
//attach the vertex and fragment shaders
glAttachShader(m_programObject, m_vertexShader);
glAttachShader(m_programObject, m_fragmentShader);
//link it all together
glLinkProgram(m_programObject);
//check for any errors with the shader program
glGetProgramiv(m_programObject, GL_LINK_STATUS, &success);
if(!success)
{
std::cout << std::endl << "Error linking GLSL shaders into a shader program." << std::endl;
std::cout << "GLSL vertex shader: '" << vertexFilename << "'" << std::endl;
std::cout << "GLSL fragment shader: '" << fragmentFilename << "'" << std::endl << std::endl;
std::cout << "Program info log:" << std::endl << programInfoLog(m_programObject) << std::endl;
return false;
}
}
}
std::cout << "Loaded GLSL program: '" << m_name << "'" << std::endl;
return true;
}