vipr

WebGL API

Vocab

• Buffers: arrays of binary data that are uploaded to the GPU (positions, normals, texture coordiinates, vertex colors, anything you want)

• Attributes: specify how to pull data out of a buffer (which buffer, which data type, offset to start at, number of bytes for each segment of data)

• Uniforms: global variables for the shader program

Shader Notes

• Vertex shader provides clipspace coordinates

• Fragment shader provides the color

• all shaders have a main() function

• gl_Position must be set by the vertex shader

• gl_FragColor must be set by the fragment shader

General Notes

• range is [-1,1] for colors and clipspace coordinates

Optimization Notes

• Looking up attribute locations (and uniform locations) is something you should do during initialization, not in your render loop.