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POGLSL example not working on mac
 

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    <p>I am trying to create a GLSL example on Mac. I am trying to set up one color attribute per vertex. However, when the program runs, I just get a purple screen (the purple comes from glClearColor). I post the relevant code snippets.</p> <pre><code>-(void)drawRect:(NSRect)dirtyRect { // get program ID for shader program GLuint programID = [self loadShaders]; // get new dimensions NSSize dim = [self frame].size; // clear the background with color glClearColor(0.4f, 0.1f, 0.7f, 1.0f); glDepthRange(1.0, -1.0); glViewport(0, 0, dim.width, dim.height); glClear(GL_COLOR_BUFFER_BIT); // generate a buffer for our triangle glGenBuffers(2, vertexBuffer); glBindBuffer(GL_ARRAY_BUFFER, vertexBuffer[0]); glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW); glBindBuffer(GL_ARRAY_BUFFER, vertexBuffer[1]); glBufferData(GL_ARRAY_BUFFER, sizeof(colors), colors, GL_STATIC_DRAW); glUseProgram(programID); glBindBuffer(GL_ARRAY_BUFFER, vertexBuffer[0]); glEnableVertexAttribArray(0); glVertexAttribPointer(VERTEX_POS_INDEX, VERTEX_POS_SIZE, GL_FLOAT, GL_FALSE, VERTEX_POS_SIZE*sizeof(vertices), vertices); glBindBuffer(GL_ARRAY_BUFFER, vertexBuffer[1]); glEnableVertexAttribArray(1); glVertexAttribPointer(VERTEX_COLOR_INDEX, VERTEX_COLOR_SIZE, GL_FLOAT, GL_FALSE, VERTEX_POS_SIZE*sizeof(colors), colors); glDrawArrays(GL_TRIANGLES, 0, 3); glDisableVertexAttribArray(0); glDisableVertexAttribArray(1); glUseProgram(0); // flush buffer glFlush(); [[self openGLContext] flushBuffer]; } </code></pre> <p>And then the loading shadings code:</p> <pre><code>-(GLuint)loadShaders { printf("GLSL version %s\n", glGetString(GL_SHADING_LANGUAGE_VERSION)); printf("GL Version: %s", glGetString(GL_VERSION)); // Create the shaders GLuint vertexShaderID = glCreateShader(GL_VERTEX_SHADER); GLuint fragmentShaderID = glCreateShader(GL_FRAGMENT_SHADER); // get handle for app bundle NSBundle *appBundle = [NSBundle mainBundle]; // get the path for the vertex shader file NSString *vertexFilePath = [appBundle pathForResource:vertexShaderFile ofType:nil]; // get the path for the fragment shader file NSString *fragmentFilePath = [appBundle pathForResource:fragmentShaderFile ofType:nil]; // get the contents of the vertex shader file into a string NSString *vertexFileContents = [NSString stringWithContentsOfFile:vertexFilePath encoding:NSUTF8StringEncoding error:NULL]; NSLog(@"%@", vertexFileContents); // get the contents of the fragment shader file into a string NSString *fragmentFileContents = [NSString stringWithContentsOfFile:fragmentFilePath encoding:NSUTF8StringEncoding error:NULL]; NSLog(@"%@", fragmentFileContents); GLint Result = GL_FALSE; int infoLogLength; // get a pointer the vertex shader program source, compile shader program const char *vertexSourcePointer = [vertexFileContents UTF8String]; glShaderSource(vertexShaderID, 1, &amp;vertexSourcePointer, NULL); glCompileShader(vertexShaderID); // check the vertex shader glGetShaderiv(vertexShaderID, GL_COMPILE_STATUS, &amp;Result); glGetShaderiv(vertexShaderID, GL_INFO_LOG_LENGTH, &amp;infoLogLength); char vertexShaderErrorMessage[infoLogLength]; glGetShaderInfoLog(vertexShaderID, infoLogLength, NULL, vertexShaderErrorMessage); // print error message NSLog(@"%@", [NSString stringWithUTF8String:vertexShaderErrorMessage]); // get a pointer to the fragment shader program source, compile shader program const char *fragmentSourcePointer = [fragmentFileContents UTF8String]; glShaderSource(fragmentShaderID, 1, &amp;fragmentSourcePointer, NULL); glCompileShader(fragmentShaderID); // check the fragment shader glGetShaderiv(fragmentShaderID, GL_COMPILE_STATUS, &amp;Result); glGetShaderiv(fragmentShaderID, GL_INFO_LOG_LENGTH, &amp;infoLogLength); char fragmentShaderErrorMessage[infoLogLength]; glGetShaderInfoLog(fragmentShaderID, infoLogLength, NULL, fragmentShaderErrorMessage); // print error message NSLog(@"%@", [NSString stringWithUTF8String:fragmentShaderErrorMessage]); // link the program NSLog(@"Linking program..."); GLuint programID = glCreateProgram(); glAttachShader(programID, vertexShaderID); glAttachShader(programID, fragmentShaderID); glBindAttribLocation(programID, 0, "position"); glBindAttribLocation(programID, 1, "inColor"); glLinkProgram(programID); // check the program glGetProgramiv(programID, GL_LINK_STATUS, &amp;Result); glGetProgramiv(programID, GL_INFO_LOG_LENGTH, &amp;infoLogLength); char shaderProgramErrorMessage[max(infoLogLength, (int)1)]; glGetProgramInfoLog(programID, infoLogLength, NULL, shaderProgramErrorMessage); // pring error message NSLog(@"%@", [NSString stringWithUTF8String:shaderProgramErrorMessage]); // delete shaders glDeleteShader(vertexShaderID); glDeleteShader(fragmentShaderID); return programID; } </code></pre> <p>And finally the shaders:</p> <pre><code>#version 120 attribute vec4 position; attribute vec4 inColor; varying vec4 outColor; void main() { gl_Position = position; outColor = inColor; } </code></pre> <p>And </p> <pre><code>#version 120 varying vec4 outColor; void main() { gl_FragColor = outColor; } </code></pre>
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