{
  "id": "ascii_render_post",
  "name": "ASCII Render Post",
  "description": "Renders any TOP as a grid of ASCII glyphs, mirroring create_ascii_render: the source is downsampled to one texel per character cell, a textTOP bakes a glyph atlas of the charset, and a GLSL TOP looks up each cell's luminance to pick a glyph from the atlas. Uses a synthetic animated noiseTOP source so it previews offline. Uniforms expose the color mode, charset length, foreground/background colors and a wet/dry mix. Fills the ascii/dither/halftone post gap. Offline-validated against RecipeSchema; UNVERIFIED pending live cook-check (glyph-atlas UV math benefits from a live look).",
  "tags": ["post-processing", "ascii", "glsl", "stylize", "retro"],
  "difficulty": "advanced",
  "td_version_min": "2022",
  "nodes": [
    {
      "name": "source",
      "type": "noiseTOP",
      "parameters": { "monochrome": 0, "period": 3 },
      "comment": "Synthetic source — swap for any TOP (selectTOP to an existing one, moviefileinTOP, etc)."
    },
    {
      "name": "cells",
      "type": "resolutionTOP",
      "parameters": {
        "outputresolution": "custom",
        "resolutionw": 160,
        "resolutionh": 90,
        "filter": "box"
      },
      "comment": "Downsample to one texel per character cell (here 160x90 cells for a 1280x720 / cell_size 8 grid)."
    },
    {
      "name": "atlas",
      "type": "textTOP",
      "parameters": {
        "text": " .:-=+*#%@",
        "outputresolution": "custom",
        "resolutionw": 80,
        "resolutionh": 8,
        "alignx": "left",
        "aligny": "middle",
        "fontcolorr": 1,
        "fontcolorg": 1,
        "fontcolorb": 1,
        "bgcolora": 0
      },
      "comment": "Glyph atlas: the charset laid out left-to-right, white glyphs on transparent (10 chars x cell_size 8 = 80 wide)."
    },
    {
      "name": "ascii_glsl",
      "type": "glslTOP",
      "parameters": { "outputresolution": "custom", "resolutionw": 1280, "resolutionh": 720 },
      "comment": "Per-fragment: read the cell luma, map to a glyph index, sample the atlas at that slot."
    },
    { "name": "out1", "type": "nullTOP", "comment": "Final ASCII output." }
  ],
  "connections": [
    { "from": "source", "to": "cells" },
    { "from": "cells", "to": "ascii_glsl", "to_input": 0 },
    { "from": "atlas", "to": "ascii_glsl", "to_input": 1 },
    { "from": "ascii_glsl", "to": "out1" }
  ],
  "glsl_code": {
    "ascii_glsl": "out vec4 fragColor;\nuniform float uColorMode;\nuniform float uCharsetLen;\nuniform float uMix;\nuniform vec3  uFg;\nuniform vec3  uBg;\nuniform float uCellSize;\n\nvoid main() {\n    vec2 uv = vUV.st;\n\n    // sTD2DInputs[0] = downsampled cell grid (1 texel per cell).\n    vec4 cell = texture(sTD2DInputs[0], uv);\n    float lum = dot(cell.rgb, vec3(0.299, 0.587, 0.114));\n\n    // Map luminance -> charset index (clamped, integer).\n    float idx = floor(clamp(lum, 0.0, 0.999) * uCharsetLen);\n\n    // Local UV inside the current cell.\n    vec2 cellsXY = uTDOutputInfo.res.zw / max(uCellSize, 1.0);\n    vec2 localUV = fract(uv * cellsXY);\n\n    // Atlas UV: glyph idx occupies horizontal slot [idx/N, (idx+1)/N].\n    vec2 atlasUV = vec2((idx + localUV.x) / uCharsetLen, localUV.y);\n    float glyph = texture(sTD2DInputs[1], atlasUV).r;\n\n    // Colour mix.\n    vec3 fg, bg;\n    int mode = int(uColorMode);\n    if (mode == 0) {\n        fg = uFg; bg = uBg;\n    } else if (mode == 1) {\n        fg = cell.rgb; bg = uBg;\n    } else {\n        fg = mix(uBg, uFg, lum); bg = uBg;\n    }\n    vec3 styled = mix(bg, fg, glyph);\n\n    fragColor = TDOutputSwizzle(mix(texture(sTD2DInputs[0], uv), vec4(styled, 1.0), uMix));\n}\n"
  },
  "glsl_uniforms": [
    {
      "node": "ascii_glsl",
      "name": "uColorMode",
      "kind": "float",
      "value": 0,
      "min": 0,
      "max": 2,
      "label": "Color Mode",
      "description": "0 = fixed fg/bg, 1 = source color on bg, 2 = luma-shaded fg on bg."
    },
    {
      "node": "ascii_glsl",
      "name": "uCharsetLen",
      "kind": "float",
      "value": 10,
      "label": "Charset Length",
      "description": "Number of glyphs in the atlas (matches the atlas text length)."
    },
    {
      "node": "ascii_glsl",
      "name": "uMix",
      "kind": "float",
      "value": 1.0,
      "min": 0,
      "max": 1,
      "label": "Mix",
      "description": "Wet/dry between the original cell grid and the ASCII result."
    },
    {
      "node": "ascii_glsl",
      "name": "uFg",
      "kind": "color",
      "value": [0.6, 1.0, 0.7, 1.0],
      "label": "Foreground"
    },
    {
      "node": "ascii_glsl",
      "name": "uBg",
      "kind": "color",
      "value": [0.02, 0.03, 0.02, 1.0],
      "label": "Background"
    },
    {
      "node": "ascii_glsl",
      "name": "uCellSize",
      "kind": "float",
      "value": 8,
      "label": "Cell Size",
      "description": "Pixels per character cell; must match the downsample/atlas geometry."
    }
  ],
  "preview_description": "A flowing noise field rendered as green terminal ASCII art on near-black — denser glyphs (#, @) where the image is bright, sparse dots where it is dark."
}