xcode Open GL 错误：使用未声明的标识符“gl_FragColor”
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Open GL Error: Use of undeclared identifier 'gl_FragColor'
提问by Sumanth
I am not understanding what was the error here. Please tell me how to resolve the error i am new to openGL developement. It is not compiling it is showing error like this ERROR: 0:4: Use of undeclared identifier 'gl_FragColor'
我不明白这里的错误是什么。请告诉我如何解决我是 openGL 开发新手的错误。它没有编译它显示这样的错误ERROR: 0:4: Use of undeclared identifier 'gl_FragColor'
-(void)compileShaders{
GLuint vertexShader = [self compileShader:@"SimpleVertex" withType:GL_VERTEX_SHADER];
GLuint fragmentShader = [self compileShader:@"SimpleFragment" withType:GL_VERTEX_SHADER];
GLuint programHandle = glCreateProgram();
glAttachShader(programHandle, vertexShader);
glAttachShader(programHandle, fragmentShader);
glLinkProgram(programHandle);
GLint linkSuccess;
glGetProgramiv(programHandle, GL_LINK_STATUS, &linkSuccess);
if (linkSuccess == GL_FALSE) {
GLchar messages[256];
glGetProgramInfoLog(programHandle, sizeof(messages), 0, &messages[0]);
NSString *messageString = [NSString stringWithUTF8String:messages];
NSLog(@"%@",messageString);
exit(1);
}
glUseProgram(programHandle);
_positionSlot = glGetAttribLocation(programHandle, "Position");
_colorSlot = glGetAttribLocation(programHandle, "Sourcecolor");
glEnableVertexAttribArray(_positionSlot);
glEnableVertexAttribArray(_colorSlot);
}
回答by Sumanth
Modify the line 2like this
2像这样修改行
GLuint fragmentShader = [self compileShader:@"SimpleFragment" withType:GL_FRAGMENT_SHADER];
You should compile fragments in Fragment shader.
您应该在片段着色器中编译片段。
