playcanvas/build/playcanvas.prf/src/scene/shader-lib/glsl/chunks/particle/frag/particleOutputRgba8.js

PlayCanvas WebGL game engine

var particleOutputRgba8PS = `
uniform vec3 outBoundsMul;
uniform vec3 outBoundsAdd;
vec2 encodeFloatRG( float v ) {
	vec2 enc = vec2(1.0, 255.0) * v;
	enc = fract(enc);
	enc -= enc.yy * vec2(1.0/255.0, 1.0/255.0);
	return enc;
}
vec4 encodeFloatRGBA( float v ) {
	vec4 enc = vec4(1.0, 255.0, 65025.0, 160581375.0) * v;
	enc = fract(enc);
	enc -= enc.yzww * vec4(1.0/255.0,1.0/255.0,1.0/255.0,0.0);
	return enc;
}
void writeOutput() {
	outPos = outPos * outBoundsMul + outBoundsAdd;
	outAngle = fract(outAngle / PI2);
	outVel = (outVel / maxVel) + vec3(0.5);
	float maxNegLife = max(lifetime, (numParticles - 1.0) * (rate+rateDiv));
	float maxPosLife = lifetime+1.0;
	outLife = (outLife + maxNegLife) / (maxNegLife + maxPosLife);
	if (gl_FragCoord.y < 1.0) {
		gl_FragColor = vec4(encodeFloatRG(outPos.x), encodeFloatRG(outPos.y));
	} else if (gl_FragCoord.y < 2.0) {
		gl_FragColor = vec4(encodeFloatRG(outPos.z), encodeFloatRG(outAngle));
	} else if (gl_FragCoord.y < 3.0) {
		gl_FragColor = vec4(outVel, visMode*0.5+0.5);
	} else {
		gl_FragColor = encodeFloatRGBA(outLife);
	}
}
`;

export { particleOutputRgba8PS as default };