opengl-buffer-swap-test

Testing Shadertoy-style buffer swapping, where previous-frame buffer content is used to produce feedback effects.

For testing, this is an implementation of the HSL Cellular Automata shader. However, others like isovalues 3 don't work for reasons I don't yet understand.

• FrameData provides a full-viewport quad (ie. draw all pixels) to the vertex shader
• BufferInfo stores a related set of Framebuffer and Texture handles and a TextureUnit
• RenderPass stores BufferInfo objects, the current-frame draw buffer and the last frame's old buffer