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[READ-ONLY] Mirror of https://github.com/excaliburjs/Excalibur. 🎮 Your friendly TypeScript 2D game engine for the web 🗡️ excaliburjs.com
excalibur excaliburjs game-development game-engine game-framework gamedev games html5-canvas typescript
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431 B · 20 lines
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precision mediump float;in lowp vec4 v_color;
out vec4 fragColor;
void main() { float r = 0.0, delta = 0.0, alpha = 1.0; vec2 cxy = 2.0 * gl_PointCoord - 1.0; r = dot(cxy, cxy);
delta = fwidth(r); alpha = 1.0 - smoothstep(1.0 - delta, 1.0 + delta, r); // "premultiply" the color by alpha vec4 color = v_color; color.a = color.a * alpha; color.rgb = color.rgb * color.a; fragColor = color;}