37 lines
1.3 KiB
Plaintext
37 lines
1.3 KiB
Plaintext
// Has 2 circles, an inner one that is unaffected and an outer one. Anything past the outer one is full red
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// and in-between is a gradient.
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light_mode unshaded;
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uniform highp vec3 color;
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uniform highp float time;
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// Uniforms because it makes testing way easier. If needed make it const.
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uniform highp float outerCircleRadius;
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uniform highp float outerCircleMaxRadius;
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uniform highp float innerCircleRadius;
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uniform highp float innerCircleMaxRadius;
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uniform highp float darknessAlphaOuter;
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const highp float darknessAlphaInner = 0.0;
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void fragment() {
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highp vec2 pixelSize = vec2(1.0/SCREEN_PIXEL_SIZE.x, 1.0/SCREEN_PIXEL_SIZE.y);
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highp vec2 pixelCenter = pixelSize*0.5;
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highp float distance = length(FRAGCOORD.xy - pixelCenter);
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highp float innerRadius = innerCircleRadius + time * (innerCircleMaxRadius - innerCircleRadius);
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highp float outerRadius = outerCircleRadius + time * (outerCircleMaxRadius - outerCircleRadius);
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if(distance > outerRadius) {
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COLOR = vec4(color.x, color.y, color.z, darknessAlphaOuter);
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}
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else if(distance < innerRadius) {
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COLOR = vec4(0.0, 0.0, 0.0, darknessAlphaInner);
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}
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else {
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highp float ratio = (distance - innerRadius) / (outerRadius - innerRadius);
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highp float alpha = darknessAlphaInner + (darknessAlphaOuter - darknessAlphaInner) * ratio;
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COLOR = vec4(color.x, color.y, color.z, alpha);
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}
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}
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