Shaders and Data

Before WebGL draws, its two shaders must be compiled, linked into a program and made current: ten calls, which GLH.program() from Hello Triangle has wrapped so far:

Data then reaches the shaders as attributes (per-vertex values from buffers), uniforms (one value for a whole draw call) and varyings (vertex outputs the rasterizer interpolates for each fragment).

Subsections

• Shader Source
• Compiling Shaders
• Linking Programs
• Shader Helper
• Locating Variables
• uniform*()
• uniformMatrix*()
• Vertex Attributes
• Uniform Arrays and Structures
• Hot-Swapping Shaders
• Cover Shaders