glsl.md

Notes

Thoughts on build a library to deal with shader management

Separate Shader Objects is a must

SPIR-V to distribute shader

glsl form spir-v form

spir-v modules may have many entry points for the same stage

portability

reduce size

protection obfuscation

runtime compiler performance no parsing time

Two steps

1. associate model with shader object
2. associate entry point with shader object glShaderBinary glSpecializeShader() glAttachShader glLinkProgram

Offline Tools

SPIRV-Tools for validation

Glslang for generate SPIRV

Changes to make in GLSL to generate valid SPIR-V

specialized constant

subroutine is not supported depracated feature: textrue2D

glsl has to be use feature from the core profile

Design the library

program ===> one stage

pipeline ===> combine multiple program to a full-blown working pipeline

each shader object how to "CRUD"

manage pipelines

different object may use different pipeline ,

uniform uniform block for each program

scenegraph travseral

recent pipeline + uniform to the model/mesh

how to group the models to minimize the pipeline switch ?

each frame scene update

can we optimize the scene graph here

each frame scene render

SoGroup and SoSeparator from open inventor