GLint ShaderProgram::loadShader(const std::string &shader_file, GLint type) {
// Create shaders
auto shader_id = glCreateShader(type);
auto result = GL_FALSE;
auto info_length = 0;
// Load shader code
std::ifstream shader_stream(shader_file);
std::string shader_code((std::istreambuf_iterator<char>(shader_stream)), std::istreambuf_iterator<char>());
// Compile shader
std::cout << "Compiling Shader ..." << shader_file << std::endl;
auto shader_code_ptr = shader_code.c_str();
glShaderSource(shader_id, 1, &shader_code_ptr, NULL);
glCompileShader(shader_id);
// Check vertex shader log
glGetShaderiv(shader_id, GL_COMPILE_STATUS, &result);
if (result == GL_FALSE) {
glGetShaderiv(shader_id, GL_INFO_LOG_LENGTH, &info_length);
std::string vertex_shader_log((unsigned int)info_length, ' ');
glGetShaderInfoLog(shader_id, info_length, NULL, &vertex_shader_log[0]);
std::cout << vertex_shader_log << std::endl;
}
return shader_id;
}
GLuint cShader::LoadShader(const std::string& filename, GLenum shader_type)
{
GLuint shader_handle = glCreateShader(shader_type);
//read shader file
std::ifstream shader_file(filename.c_str());
std::cout<< "Compiling shader: " << filename.c_str() << std::endl;
std::string shader_code((std::istreambuf_iterator<char>(shader_file)),
(std::istreambuf_iterator<char>()));
const char* shader_code_str = shader_code.c_str();
glShaderSource(shader_handle, 1, &shader_code_str, NULL);
glCompileShader(shader_handle);
// Check the compile status
GLint compiled;
glGetShaderiv(shader_handle, GL_COMPILE_STATUS, &compiled);
if (!compiled)
{
std::cout<< "shader compilation failed: " << filename.c_str() << std::endl;
// get log string length
GLint max_len = 0;
glGetShaderiv(shader_handle, GL_INFO_LOG_LENGTH, &max_len);
char* error_log = new char[max_len];
glGetShaderInfoLog(shader_handle, max_len, &max_len, error_log);
std::cout << error_log << std::endl;
delete[] error_log;
glDeleteShader(shader_handle);
shader_handle = -1;
}
return shader_handle;
}
