GLuint LoadShader(const char* vertex_path, const char* fragment_path)
{
GLuint vertShader = glCreateShader(GL_VERTEX_SHADER);
GLuint fragShader = glCreateShader(GL_FRAGMENT_SHADER);
// Read shaders
std::string vertShaderStr = readFile(vertex_path);
std::string fragShaderStr = readFile(fragment_path);
const char* vertShaderSrc = vertShaderStr.c_str();
const char* fragShaderSrc = fragShaderStr.c_str();
GLint result = GL_FALSE;
int logLength;
// Compile vertex shader
glShaderSource(vertShader, 1, &vertShaderSrc, NULL);
glCompileShader(vertShader);
// Check vertex shader
glGetShaderiv(vertShader, GL_COMPILE_STATUS, &result);
glGetShaderiv(vertShader, GL_INFO_LOG_LENGTH, &logLength);
// Handle error output
std::vector<char> vertShaderError((logLength > 1) ? logLength : 1);
glGetShaderInfoLog(vertShader, logLength, NULL, &vertShaderError[0]);
std::cout << &vertShaderError[0] << std::endl;
// Compile fragment shader
std::cout << "Compiling fragment shader." << std::endl;
glShaderSource(fragShader, 1, &fragShaderSrc, NULL);
glCompileShader(fragShader);
// Check fragment shader
glGetShaderiv(fragShader, GL_COMPILE_STATUS, &result);
glGetShaderiv(fragShader, GL_INFO_LOG_LENGTH, &logLength);
//Handle error output
std::vector<char> fragShaderError((logLength > 1) ? logLength : 1);
glGetShaderInfoLog(fragShader, logLength, NULL, &fragShaderError[0]);
std::cout << &fragShaderError[0] << std::endl;
std::cout << "Linking program" << std::endl;
GLuint program = glCreateProgram();
glAttachShader(program, vertShader);
glAttachShader(program, fragShader);
glLinkProgram(program);
glGetProgramiv(program, GL_LINK_STATUS, &result);
glGetProgramiv(program, GL_INFO_LOG_LENGTH, &logLength);
std::vector<char> programError( (logLength > 1) ? logLength : 1 );
glGetProgramInfoLog(program, logLength, NULL, &programError[0]);
std::cout << &programError[0] << std::endl;
glDeleteShader(vertShader);
glDeleteShader(fragShader);
return program;
}
GLuint Shader::LoadShader(const char* vertPath, const char* fragPath) {
//generate shader names
GLuint vertShader = glCreateShader(GL_VERTEX_SHADER);
GLuint fragShader = glCreateShader(GL_FRAGMENT_SHADER);
//get shader src
string vertShaderStr = ReadFile(vertPath);
string fragShaderStr = ReadFile(fragPath);
const char* vertShaderSrc = vertShaderStr.c_str();
const char* fragShaderSrc = fragShaderStr.c_str();
GLint result = GL_FALSE;
int logLength;
//compile vertex shader
glShaderSource(vertShader, 1, &vertShaderSrc, NULL);
glCompileShader(vertShader);
glGetShaderiv(vertShader, GL_COMPILE_STATUS, &result);
glGetShaderiv(vertShader, GL_INFO_LOG_LENGTH, &logLength);
vector<char> vertShaderError(logLength);
glGetShaderInfoLog(vertShader, logLength, NULL, &vertShaderError[0]);
cout << &vertShaderError[0] << endl;
//compile fragment shader
glShaderSource(fragShader, 1, &fragShaderSrc, NULL);
glCompileShader(fragShader);
glGetShaderiv(fragShader, GL_COMPILE_STATUS, &result);
glGetShaderiv(fragShader, GL_INFO_LOG_LENGTH, &logLength);
vector<char> fragShaderError(logLength);
glGetShaderInfoLog(fragShader, logLength, NULL, &fragShaderError[0]);
cout << &fragShaderError[0] << endl;
//link the program
GLuint program = glCreateProgram();
glAttachShader(program, vertShader);
glAttachShader(program, fragShader);
glLinkProgram(program);
glGetProgramiv(program, GL_LINK_STATUS, &result);
glGetProgramiv(program, GL_INFO_LOG_LENGTH, &logLength);
vector<char> programError(logLength > 1 ? logLength : 1);
glGetProgramInfoLog(program, logLength, NULL, &programError[0]);
cout << &programError[0] << endl;
glDeleteShader(vertShader);
glDeleteShader(fragShader);
return program;
}
// load shaders
bool ShaderLoader::loadShader(const char *vertex_path, const char *fragment_path, GLuint &program)
{
// create shaders
GLuint vertShader = glCreateShader(GL_VERTEX_SHADER);
GLuint fragShader = glCreateShader(GL_FRAGMENT_SHADER);
// read shaders
std::string vertShaderStr = readFile(vertex_path);
std::string fragShaderStr = readFile(fragment_path);
const char *vertShaderSrc = vertShaderStr.c_str();
const char *fragShaderSrc = fragShaderStr.c_str();
// hold results
GLint result = GL_FALSE;
int logLength;
// compile vertex shader
glShaderSource(vertShader, 1, &vertShaderSrc, NULL);
glCompileShader(vertShader);
// check vertex shader
glGetShaderiv(vertShader, GL_COMPILE_STATUS, &result);
// failed compile
if(!result)
{
glGetShaderiv(vertShader, GL_INFO_LOG_LENGTH, &logLength);
std::vector<char> vertShaderError((logLength > 1) ? logLength : 1);
glGetShaderInfoLog(vertShader, logLength, NULL, &vertShaderError[0]);
std::cerr << "[F] FAILED TO COMPILE VERTEX SHADER!" << &vertShaderError[0] << std::endl;
return false;
}
// compile fragment shader
glShaderSource(fragShader, 1, &fragShaderSrc, NULL);
glCompileShader(fragShader);
// check fragment shader
glGetShaderiv(fragShader, GL_COMPILE_STATUS, &result);
// failed compile
if(!result)
{
glGetShaderiv(fragShader, GL_INFO_LOG_LENGTH, &logLength);
std::vector<char> fragShaderError((logLength > 1) ? logLength : 1);
glGetShaderInfoLog(fragShader, logLength, NULL, &fragShaderError[0]);
std::cerr << "[F] FAILED TO COMPILE FRAGMENT SHADER!" << &fragShaderError[0] << std::endl;
return false;
}
// create program and link with shaders
program = glCreateProgram();
glAttachShader(program, vertShader);
glAttachShader(program, fragShader);
glLinkProgram(program);
// check program status
glGetProgramiv(program, GL_LINK_STATUS, &result);
// failed program
if(!result)
{
glGetProgramiv(program, GL_INFO_LOG_LENGTH, &logLength);
std::vector<char> programError( (logLength > 1) ? logLength : 1 );
glGetProgramInfoLog(program, logLength, NULL, &programError[0]);
std::cerr << "[F] THE SHADER PROGRAM FAILED TO LINK" << &programError[0] << std::endl;
return false;
}
// delete shaders after attachment
glDeleteShader(vertShader);
glDeleteShader(fragShader);
// return program with shaders
return true;
}
