drawing a line with opengl 3.0

OpenGL OpenGL: Basic Coding
1

hi,

simple question :wink:

what is the preferred way drawing a line in an OpenGL 3.0 forward compatible context.

greetings

btw. what about antialiasing

2

3.0: no wide lines, regular lines are there. VBOs and GL_LINES
3.1: wide lines are back.

Lines get antialiased if you render to a MSAA/CSAA framebuffer. I don’t know if antialiasing tricks on non-MSAA buffer via hints is supported.

3

ah ok thx :slight_smile:

4

Someone asked how to access GL3.0, then deleted his post.
I will anyway post the code, for anyone to copy:


	...	
	hDC=GetDC(hMain);


	GLuint		PixelFormat;
	PixelFormat=ChoosePixelFormat(hDC,&pfd);
	
	SetPixelFormat(hDC,PixelFormat,&pfd);
	


	hRC=wglCreateContext(hDC);
	wglMakeCurrent(hDC,hRC);

	
	PFNWGLCREATECONTEXTATTRIBSARBPROC wglCreateContextAttribsARB = (PFNWGLCREATECONTEXTATTRIBSARBPROC)wglGetProcAddress("wglCreateContextAttribsARB");
	if(!wglCreateContextAttribsARB){
		MessageBoxA(0,"OpenGL3.1 not supported or enabled in NVemulate",0,0);
	}else{
		int attribs[] = {
			WGL_CONTEXT_MAJOR_VERSION_ARB, 3,
			WGL_CONTEXT_MINOR_VERSION_ARB, 0,
			WGL_CONTEXT_FLAGS_ARB, WGL_CONTEXT_DEBUG_BIT_ARB | WGL_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB, // not supported by Nvidia on older drivers
			0
		};
		
		HGLRC gl3Ctx = wglCreateContextAttribsARB(hDC, 0, attribs);
		if(gl3Ctx){
			wglDeleteContext(hRC);
			hRC =gl3Ctx;
			wglMakeCurrent(hDC,hRC);
			//prints("opengl3 success");
			//prints((char*)glGetString(GL_VERSION));
		}else{
			MessageBoxA(0,"OpenGL3.0 context did not init, staying in 2.1",0,0);
		}
	}

	InitGLExtentions(); // dynamically load gl3.0 funcs via wglGetProcAddress()