/**
Loads a shader, where <I>basename</I> contains the path and filename up to the
".vrt"/".pix" extensions, and <I>defines</I> is a string to prepend to the
beginning of both vertex and pixel shaders.
*/
static ShaderRef loadShader(const std::string& baseName, const std::string& defines) {
const std::string& vertexShader = loadShaderCode(baseName + ".vrt");
const std::string& pixelShader = loadShaderCode(baseName + ".pix");
ShaderRef s = Shader::fromStrings
(baseName + ".vrt", defines + vertexShader,
baseName + ".pix", defines + pixelShader);
return s;
}
bool Shader::loadFragShader(const char* shaderFile) {
mFragShaderID = loadShaderCode(shaderFile, GL_FRAGMENT_SHADER);
if (mFragShaderID == 0) {
std::cout << "(initShader) - Could not create vertex shader." << std::endl;
}
return mFragShaderID != 0;
}
bool Shader::loadVertShader(const char* shaderFile) {
mVertShaderID = loadShaderCode(shaderFile, GL_VERTEX_SHADER);
if (mVertShaderID == 0) {
std::cout << "(initShader) - Could not create vertex shader." << std::endl;
}
return mVertShaderID != 0;
}
GLuint createShader(const char* vertexProgramCode, const char* fragmentProgramCode) {
GLuint program = 0;
program = glCreateProgram();
// check if operation failed //
if (program == 0) {
std::cout << "(initShader) - Failed creating shader program." << std::endl;
return 0;
}
GLuint vertexShader = 0;
GLuint fragmentShader = 0;
if (!loadShaderCode(vertexProgramCode, vertexShader, fragmentProgramCode, fragmentShader)) {
glDeleteProgram(program);
return 0;
}
if (!attachAndLink(program, vertexShader, fragmentShader)) {
glDeleteProgram(program);
return 0;
}
return program;
}
