VertexBuffer_DrawingTriangle.md - z22756392z/wp109b GitHub Wiki

Modern OpenGL vs Legacy OpenGL

The Modern OpenGL is very powerful. And there're lots of things we could do.

As a result, there's quite a lot setup we actually need to do, before we can see a triangle on the screen.

Unlike glfw( Graphics Library Framework) which is just a legacy OpenGL , we just use glBegin() and glEnd() to draw a triangle on the screen.

Because that is just five line in the code and we're done. It is easy to do and require no setup.

However, to draw a triangle using modern OpenGL a few thing need to happen.

• Vertex Buffer -> it is just a buffer. It is an array of bytes or memory. The difference is it is in our GPU in our VR(video RAM).

• Shader -> A code run on GPU. Tell GPU how to draw.