bool wrench::gl::Shader::init(GLenum shaderType, const string &filename)
{
bool shaderCreated = false;
if (GLEW_VERSION_2_0)
{
m_shaderID = glCreateShader(shaderType);
const GLchar* shaderSource = _loadShaderSource(filename);
if (shaderSource == nullptr)
{
Logger::logError("Shader source file not found: " + filename);
}
else
{
bool shaderCompileFlag = false;
glShaderSource(m_shaderID, 1, &shaderSource, 0);
glCompileShader(m_shaderID);
shaderCompileFlag = _validateShader(m_shaderID, filename);
if (!shaderCompileFlag) return false;
}
if(nullptr != shaderSource)
{
delete[] shaderSource;
}
}
return shaderCreated;
}
/* Initialize a shader
* @params name {string} name of the shader
* @params type {GLenum} GL_VERTEX_SHADER or GL_FRAGMENT_SHADER
* @params filename {const char*} shader source file name
* @returns 0 correct result
* @returns -1 invalid file name
* @returns -2 can't get shader's source from file
* @returns -3 shader compile error
*/
int Shader::init(string name, GLenum type, const char* filename) {
if (!filename) {
return -1;
}
mName = name;
mType = type;
mCompiled = false;
// Create OpenGL shader
mId = glCreateShader(type);
int source, compile;
// Load shader source
source = _loadShaderSource(filename);
// Compile shader
if (!source) {
// Compile shader
glCompileShader(mId);
// Get compile state
glGetShaderiv(mId, GL_COMPILE_STATUS, &compile);
if (compile == GL_FALSE) {
_printInfoLog();
return -3;
} else {
return 0;
}
}
else
// Cant not get shader source
return -2;
}
