A library of procedural textures and image effects written in glsl and a viewer to display them.
The viewer can be started with either a project file (.glsl-project) or a fragment shader (.frag):
./procedural-viewer <file> [options]
| Key | Action |
|---|---|
| S | screenshot (using offscreen rendering, the framebuffers of the other stages are also saved to files) |
| R | reload shaders |
| F | toggle frame time display |
Shaders and textures will also automatically be reloaded on file changes.
A project file consists of internal includes (from the library), your own includes, textures and stages, each of which should include a main function. All stages are rendered to textures, except the last stage, which is rendered to the default framebuffer. Here is a sample project file:
internal-includes:
util
sphere
lighting
external-includes:
settings: settings.frag
textures:
normals: normals.png
depth: depth.png
stages:
base: image.frag
final: blur.frag
The textures and the results of all previous stages are accessible (as uniform sampler2D using the format GL_RGBA8) by the names given to them in the project file. Additionally the following variables can be used:
in vec2 normalizedCoordout vec4 fragColoruniform ivec2 iResolutionuniform float iTime(in seconds)
The images used in some examples are not included. They can be downloaded with the script examples/resources/download_textures.py however.