02_json_format.md

JSON format

Example: checker.json

{
  "textures": {
    "final": {
      "width": 800,
      "height": 600,
      "filter": false
    }
  },
  "blit": "final",
  "passes": [
    {
      "shader": "shaders/checkerboard.frag",
      "samplers": [],
      "output": "final",
      "params": [ 32 ]
    }
  ]
}

Textures

• A key-value list of named textures (framebuffers as well)
• Texture names must start with a letter (A-Z and a-z).
• Texture names starting with ! are considered reserved.

1. width: texture's width (should be greater or equal to 1).
2. height: texture's height (should be greater or equal to 1).
3. filter: when true, linear filtering is applied when sampling the texture.

Reserved texture names in use

• !blank: a blank texture.
• !image: the source image.
• !vflip: the source image flipped vertically.
• !frame: the processed image blitted last frame.

Blit

After running all the passes, RITEG will blit (copy) the specified texture to the window's framebuffer.

Passes

• An array of objects defining each render pass ran in the exact oreder.

1. shader: path to a fragment shader.
2. samplers: an array of texture names bound their respective slots. Reserved texture names can be used here.
3. output: name of the texture (framebuffer) this pass will render into
4. params: an array of up to 16 floating point parameters passed to the shader.