3D graphics questions that do not deserve their own thread (OpenGL / Dx10)

The Something Awful Forums > Discussion > Serious Hardware/Software Crap > The Cavern of COBOL > 3D graphics questions that do not deserve their own thread (OpenGL / Dx10)

NorthByNorthwest: Oct 9, 2012

Joda posted:

How would you go about changing the resolution of the framebuffer you're drawing to? I'm working on a project with a 500x500 viewport, but I need to encode a 10x10 texture with data that I compute on the GPU. I'm still a huge newbie when it comes to OpenGL, so I really can't figure out how to make that work. As far as I can tell, if I make a 10x10 texture and a 10x10 renderbuffer and draw the elements I want to the texture, it just takes the top-left most 10x10 pixels of the 500x500 framebuffer, in stead of drawing the entire scene in 10x10 texels as I would expect. That is to say I bind a 10x10 texture to the framebuffer, draw my elements and get the corner of the scene in stead of the whole scene.

In my project, I used:

code:

        glBindFramebuffer(GL_FRAMEBUFFER, framebufferID);
	glViewport(0, 0, 1024, 1024);
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
        ..draw to 1024x1024 texture code...

	glBindFramebuffer(GL_FRAMEBUFFER,0);
	glViewport(0, 0, WINDOW_WIDTH, WINDOW_HEIGHT);
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
        ...draw scene code...

Changing the viewport worked nicely for me.

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The Something Awful Forums > Discussion > Serious Hardware/Software Crap > The Cavern of COBOL > 3D graphics questions that do not deserve their own thread (OpenGL / Dx10)