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shaderlib: Implement a simple pixelate function (effects.gdshaderinc), examples/hsv.gdshader -> color_and_pixelate.gdshader; implements #30

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ChaoticByte 2025-01-08 19:40:36 +01:00
parent 6c48c9fe72
commit 4d12ad4432
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4 changed files with 30 additions and 10 deletions
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13
examples/color_and_pixelate.gdshader Normal file
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@ -0,0 +1,13 @@
shader_type canvas_item;
#include "res://shaderlib/hsv.gdshaderinc"
#include "res://shaderlib/effects.gdshaderinc"
//!load ./swamp.jpg
void fragment() {
COLOR = pixelate(TEXTURE, UV, 200.0);
vec4 hsv = rgb2hsv(COLOR);
COLOR = hsv_offset(COLOR, 0.65, .42-(hsv.y*.3), -.125);
COLOR = hsv_multiply(COLOR, 1.0, 1.0, 1.25);
}

9
examples/hsv.gdshader
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@ -1,9 +0,0 @@
shader_type canvas_item;
#include "res://shaderlib/hsv.gdshaderinc"
//!load ./swamp.jpg
void fragment() {
COLOR = hsv_multiply(hsv_offset(COLOR, -0.3, 0.9, 0.0), 1.0, 0.44, 1.0);
}

14
shaderlib/effects.gdshaderinc Normal file
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@ -0,0 +1,14 @@
// pixelate by lowering uv resolution
vec4 pixelate(sampler2D tex, vec2 uv, float resolution_x) {
vec2 texture_size = vec2(textureSize(tex, 0));
vec2 ratio;
if (texture_size.x > texture_size.y) {
ratio = vec2(texture_size.x / texture_size.y, 1.0);
}
else {
ratio = vec2(1.0, texture_size.y / texture_size.x);
}
vec2 r = ratio * resolution_x;
return texture(tex, trunc(uv * r) / r);
}

4
src/Editor.gd
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@ -131,12 +131,14 @@ const gdshader_preprocessor = [
var shaderlib_regex = {
"hsv": RegEx.create_from_string(r'\s*\#include\s+\"res\:\/\/shaderlib\/hsv\.gdshaderinc\"'),
"transform": RegEx.create_from_string(r'\s*\#include\s+\"res\:\/\/shaderlib\/transform\.gdshaderinc\"'),
"transparency": RegEx.create_from_string(r'\s*\#include\s+\"res\:\/\/shaderlib\/transparency\.gdshaderinc\"')
"transparency": RegEx.create_from_string(r'\s*\#include\s+\"res\:\/\/shaderlib\/transparency\.gdshaderinc\"'),
"effects": RegEx.create_from_string(r'\s*\#include\s+\"res\:\/\/shaderlib\/effects\.gdshaderinc\"')
}
const shaderlib_functions = {
"hsv": ["rgb2hsv", "hsv2rgb", "hsv_offset", "hsv_multiply"],
"transform": ["place_texture"],
"transparency": ["alpha_blend"],
"effects": ["pixelate"]
}
#
# configure Highlighter