44 lines
1.4 KiB
GLSL
Executable File
44 lines
1.4 KiB
GLSL
Executable File
//SHADER ORIGINALY CREADED BY "abelcamarena" FROM SHADERTOY
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//MODIFIED AND PORTED TO GODOT BY AHOPNESS (@ahopness)
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//LICENSE : CC0
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//COMATIBLE WITH : GLES2, GLES3, WEBGL
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//SHADERTOY LINK : https://www.shadertoy.com/view/tsKGDm
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shader_type canvas_item;
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uniform float SCREEN_WIDTH = 320.; // Lower num - bigger pixels (this will be the screen width)
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uniform float COLOR_FACTOR :hint_range(0., 10.) = 4.; // Higher num - higher colors quality
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uniform float DITHERING_STRENTH :hint_range(0., .07) = 0.005; // Be carefull with this one, dithering can get messy really easily
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int PSXDither(ivec2 fragcoord) {
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const int dither_table[16] = {
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-4, +0, -3, +1,
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+2, -2, +3, -1,
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-3, +1, -4, +0,
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+3, -1, +2, -2
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};
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int x = fragcoord.x % 4;
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int y = fragcoord.y % 4;
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return dither_table[y * 4 + x];
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}
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void fragment(){
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// Reduce pixels
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vec2 size = SCREEN_WIDTH * SCREEN_PIXEL_SIZE.xy/SCREEN_PIXEL_SIZE.x;
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vec2 coor = floor( UV * size) ;
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vec2 uv = FRAGCOORD.xy / (1.0 / SCREEN_PIXEL_SIZE).xy;
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// Get source color
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vec3 col = texture(SCREEN_TEXTURE, uv).xyz;
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// Dithering
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col += float(PSXDither(ivec2(FRAGCOORD.xy))) * DITHERING_STRENTH;
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// Reduce colors
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col = floor(col * COLOR_FACTOR) / COLOR_FACTOR;
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// Output to screen
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COLOR = vec4(col,1.);
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} |