I found Gwen a few days ago and thought it looked like the perfect GUI toolkit for my project. But oh, dear, look at all that OpenGL 2 code in the renderer. So I thought I'd write an OpenGL 3 rende...

I'm trying to use vertex arrays to draw a reasonably large mesh, containing a large number of vertices. The textures have been determined from these and it's easy enough to draw in immediate mode a...

I'm trying to update my engine that used to use OpenGL 2.x style vertex arrays to work with OpenGL 3.x, which means updating to VAOs/VBOs. I think I'm not binding to VBO's properly. Read below for ...

The core of code (displaying red rectangle): //bind program, set uniforms, bind vbo glEnableVertexAttribArray(0); glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0,0); glDrawArrays(GL_TRIANGLES, 0...

I'm trying to draw a quad for a background (2D) using OpenGL 3.x+. Quads are deprecated, so the goal is to use two triangles to make a rectangle that fills the screen. It's working, but I'm not 100...

I'm working on some cross-platform desktop application with heavy 2-D graphics. I use OpenGL 2.0 specification because I need vertex shaders. I like 3.2+ core API because of it's simplicity and pow...

I understand that OpenGL 4 and 3 are fairly similar, especially 3.1 and 4.1. With both being essentially released together, it can be difficult to understand the rationale for OpenGL 4.0/4.1....

In the fancy new versions of OpenGL (3.0 and 4.0 up), built-in vertex attributes like gl_Vertex are being deprecated. The "new way" to actually render anything is to specify your own vertex attribu...

Is it possible to achieve flat shading in OpenGL when using glDrawElements to draw objects, and if so how? The ideal way would be to calculate a normal for each triangle only once, if possible. T...

This subject, as with any optimisation problem, gets hit on a lot, but I just couldn't find what I (think) I want. A lot of tutorials, and even SO questions have similar tips; generally covering: ...

As we all get to know eventually, the specification is one thing and the implementation is another. Most of bugs we cause ourselves, but sometimes that's not the case. I believe it'd be useful to ...

Can anyone suggest a guide for learning the OpenGL 3.2 core profile? The SDK is hard to read, and most of the guides I have seen only taught the old method.

To what extend does OpenGL's GLSL utilize SLI setups? Is it utilized at all at the point of execution or only for end rendering? Similarly, I know that OpenCL is alien to SLI but assuming one has ...

I noticed that unless I re-call VertexAttribPointer, there's not input to shaders after a BindBuffer. Is that necessary? The shaders may not change in writing but only the buffers used.

I'm working on a C++ cross-platform OpenGL application (Windows, Linux and MacOS) and I am wondering if some of you could share some advices on porting a large application to OpenGL 3. The reason I...

I was shocked when I read this (from the OpenGL wiki): glTranslate, glRotate, glScale Are these hardware accelerated? No, there are no known GPUs that execute this. The driver computes th...