@animech-public/playcanvas
Version:
PlayCanvas WebGL game engine
31 lines (29 loc) • 1.09 kB
JavaScript
var particleInputRgba8PS = `
uniform vec3 inBoundsSize;
uniform vec3 inBoundsCenter;
uniform float maxVel;
float decodeFloatRG(vec2 rg) {
return rg.y*(1.0/255.0) + rg.x;
}
float decodeFloatRGBA( vec4 rgba ) {
return dot( rgba, vec4(1.0, 1.0/255.0, 1.0/65025.0, 1.0/160581375.0) );
}
void readInput(float uv) {
vec4 tex0 = texture2D(particleTexIN, vec2(uv, 0.125));
vec4 tex1 = texture2D(particleTexIN, vec2(uv, 0.375));
vec4 tex2 = texture2D(particleTexIN, vec2(uv, 0.625));
vec4 tex3 = texture2D(particleTexIN, vec2(uv, 0.875));
inPos = vec3(decodeFloatRG(tex0.rg), decodeFloatRG(tex0.ba), decodeFloatRG(tex1.rg));
inPos = (inPos - vec3(0.5)) * inBoundsSize + inBoundsCenter;
inVel = tex2.xyz;
inVel = (inVel - vec3(0.5)) * maxVel;
inAngle = decodeFloatRG(tex1.ba) * PI2;
inShow = tex2.a > 0.5;
inLife = decodeFloatRGBA(tex3);
float maxNegLife = max(lifetime, (numParticles - 1.0) * (rate+rateDiv));
float maxPosLife = lifetime+1.0;
inLife = inLife * (maxNegLife + maxPosLife) - maxNegLife;
}
`;
export { particleInputRgba8PS as default };