35 lines
820 B
GLSL
35 lines
820 B
GLSL
#version 310 es
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precision highp float;
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uniform sampler2D state;
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uniform vec2 scale;
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out vec4 stateColor;
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vec4 get(int x, int y) {
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return texture(state, (gl_FragCoord.xy + vec2(x, y)) / scale);
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}
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void main() {
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int sum = int(get(-1, -1).r +
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get(-1, 0).r +
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get(-1, 1).r +
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get( 0, -1).r +
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get( 0, 1).r +
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get( 1, -1).r +
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get( 1, 0).r +
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get( 1, 1).r);
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vec4 current = get(0,0);
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if (sum == 3) {
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stateColor.r = 1.0;
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stateColor.g = 1.0;
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} else if (sum == 2) {
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stateColor = current;
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if (current.r == 0.0) {
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stateColor.g = max(current.g - 0.01, 0.0);
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}
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} else {
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stateColor = vec4(0.0, max(current.g - 0.01, 0.0), 0.0, 1.0);
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}
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}
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