Mac and 3.2 Core_Profile

[system]

anonymous wrote on Tuesday, February 12, 2013:

Hi everybody,

I am having a problem with glfw, glew, Mac and the 3.2 Core Profile.

I can open a Window just fine but nothing gets drawn. I researched the net and found this:

Cannot deploy GLFW 3.2

which seems to be the same Problem but I couldn’t solve it (partly because I have no Idea what crossfire is supposed to be)

So here is my Code followed by the console output

int Render::openWindow(int width /* =0*/, int height /* =0*/, int antialising /* =0*/, int vsync /* =0*/, const char* title /* ="LS_Black"*/, int fullscreen /* =0*/) 
{
	
	glfwCloseWindow();
	/**
	 * Settings for the OpenGL-Window
	 */
	
	glfwOpenWindowHint(GLFW_FSAA_SAMPLES, antialising); //antialising
	glfwOpenWindowHint(GLFW_OPENGL_VERSION_MAJOR, 3); //We want Version 3.2
	glfwOpenWindowHint(GLFW_OPENGL_VERSION_MINOR, 2);
	glfwOpenWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE); //Set Profile to not fallback able
	glfwOpenWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
	glfwOpenWindowHint(GLFW_WINDOW_NO_RESIZE, 1); //Don't want the user to resize the window
	glfwSwapInterval(vsync); // Vsync on or off

	/**
	 * Opening the Window
	 */
	int windowmode = GLFW_WINDOW;
	if (fullscreen)
	{
		windowmode = GLFW_FULLSCREEN;
	}

	if (!glfwOpenWindow(width, height, 0, 0, 0, 0, 32, 0, windowmode))
	{
		fprintf(stderr, "Failed to open OpenGL Window\n");
		return 0;
	}
	int major, minor, rev;

	glfwGetVersion(&major, &minor, &rev);
	fprintf(stderr, "Version: %d.%d.%d\n", major,minor,rev);
	/**
	 * Setting up GLEW
	 */
	glewExperimental = GL_TRUE;
	GLenum err = glewInit();
	if (err != GLEW_OK)
	{
		glfwTerminate();
		fprintf(stderr, "Failed to initialize GLEW\n");
		fprintf(stderr, "%s\n", glewGetErrorString(err));
		return 0;
	}
	glfwSetWindowTitle(title);
	fprintf(stderr, "0: %s\n", gluErrorString(glGetError()));
	return 1;
}

int main(int argc, char const *argv[])
{
	Render *myRender = new Render();
	myRender->resizeWindow(1024, 768);
	myRender->setKeyCallback(endLoop);
	myRender->setCloseCallback(closeWindow);

	GLfloat geometry[] = {
		-1.0f, -1.0f, 0.0f, 1.0f,
		1.0f, -1.0f, 0.0f, 1.0f,
		0.0f, 1.0f, 0.0f, 1.0f
	};

	GLfloat colors[] = {
		1.0f, 0.0f, 0.0f, 1.0f,
		0.0f, 1.0f, 0.0f, 1.0f,
		0.0f, 0.0f, 1.0f, 1.0f
	};

	glClearColor(0.0f, 0.0f, 0.4f, 0.0f);

	GLuint VertexArrayID;
	glGenVertexArrays(1,&VertexArrayID);
	glBindVertexArray(VertexArrayID);
	fprintf(stderr, "1: %s\n", gluErrorString(glGetError()));
	
	GLuint myObjectVertexBuffer;
	glGenBuffers(1, &myObjectVertexBuffer);
	glBindBuffer(GL_ARRAY_BUFFER,myObjectVertexBuffer);
	glBufferData(GL_ARRAY_BUFFER,12 * sizeof(GLfloat),geometry,GL_STATIC_DRAW);
	glVertexAttribPointer(0,4,GL_FLOAT,GL_FALSE,0,0);
	glEnableVertexAttribArray(0);
	fprintf(stderr, "2: %s\n", gluErrorString(glGetError()));

	GLuint ColorBufferID;
	glGenBuffers(1,&ColorBufferID);
	glBindBuffer(GL_ARRAY_BUFFER, ColorBufferID);
	glBufferData(GL_ARRAY_BUFFER,12 * sizeof(GLfloat),colors,GL_STATIC_DRAW);
	glVertexAttribPointer(1,4,GL_FLOAT,GL_FALSE,0,0);
	glEnableVertexAttribArray(1);
	fprintf(stderr, "3: %s\n", gluErrorString(glGetError()));

	
	//shader
	GLuint vertexShaderID = glCreateShader(GL_VERTEX_SHADER);
	glShaderSource(vertexShaderID,1,&VertexShader,NULL);
	glCompileShader(vertexShaderID);

	GLuint fragmentShaderID = glCreateShader(GL_FRAGMENT_SHADER);
	glShaderSource(fragmentShaderID,1,&FragmentShader,NULL);
	glCompileShader(fragmentShaderID);

	GLuint programID = glCreateProgram();
	glAttachShader(programID,vertexShaderID);
	glAttachShader(programID,fragmentShaderID);
	glLinkProgram(programID);
	glUseProgram(programID);

	GLenum error = glGetError();
	if (error != GL_NO_ERROR)
	{
		fprintf(stderr, "4: %s \n", gluErrorString(error));
		exit(-1);
	}
	

	
	while(running)
	{
		glClear(GL_COLOR_BUFFER_BIT);
		
		glBindBuffer(GL_ARRAY_BUFFER,myObjectVertexBuffer);
		glEnableVertexAttribArray(0);

		glDrawArrays(GL_TRIANGLES,0,3); //Start from 0; 3 verticies
		glDisableVertexAttribArray(0);
		
		glfwSwapBuffers();
	}

	delete myRender;
	myRender = NULL;

	delete myRenderObjectManager;
	myRenderObjectManager = NULL;

	return 1;
}	

	
	while(running)
	{
		glClear(GL_COLOR_BUFFER_BIT);
		
		glBindBuffer(GL_ARRAY_BUFFER,myObjectVertexBuffer);
		glEnableVertexAttribArray(0);

		glDrawArrays(GL_TRIANGLES,0,3); //Start from 0; 3 verticies
		glDisableVertexAttribArray(0);
		
		glfwSwapBuffers();
	}

	delete myRender;
	myRender = NULL;

	delete myRenderObjectManager;
	myRenderObjectManager = NULL;

Console:

Version: 2.7.7
0: invalid enumerant
1: no error
2: no error
3: no error
4: invalid operation

It seems that OpenGL 3.2 is not loaded

I have Mountain Lion running and OpenGL Extension Viewer says my System has the Core-Profile 3.2 available

Greetings

Stefan

[system]

elmindreda wrote on Tuesday, March 19, 2013:

glfwGetVersion retrieves the version of GLFW, not the version of the current context. The function you are looking for is glfwGetGLVersion.