Here's a quick down break down of the features:
- Vertex Shading
- Primitive Assembly with support for triangle VBOs/IBOs
- Perspective Transformation
- Rasterization through either a scanline or a tiled approach
- Fragment Shading
- A depth buffer for storing and depth testing fragments
- Fragment to framebuffer writing
- A simple lighting/shading scheme, such as Lambert or Blinn-Phong, implemented in the fragment shader
- Back face culling
- Mouse based interaction
- Color interpolation
Here is a render!
I'm going to talk about the performance of the system briefly. All times are measured with the dragon file, which is 100,000 triangles.
- Base code (io really) 0.007 ms total per frame
- With vertex shader 0.008 ms total per frame
- With assembly 0.0095 ms total per frame (+18.75%)
- Rasterization step 0.012 ms total per frame (+26%)
- Rasterization step with back face culling 0.011 ms total per frame (-19%)
- Fragment shader 0.013 ms total per frame (+18%)
- Fragment shader w/color interpolation 0.013 ms total per frame (+18%)
- Render step 0.014 ms total per frame (+7%)
So, culling unseen faces save you on render pretty substantially! And color interpolation didn't affect things in a noticeable way.
And mouse based scrolling obviously doesn't affect anything. in terms of performance.