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static const std::string COMPUTE_SHADER_CODE = R"(
#version 430
layout (local_size_x = 1) in;
layout (std430, binding=1) buffer bufferA{ float data[]; };
uniform vec2 world;
float rand(vec2 co){
return fract(sin(dot(co.xy, vec2(12.9898,78.233))) * 43758.5453);
}
bool insideWorld(vec2 v) {
return v.x > -world.x/2.
&& v.x < world.x/2.
&& v.y > -world.y/2.
&& v.y < world.y/2.;
}
void main() {
uint idx = 3*gl_GlobalInvocationID.x;
vec2 v = vec2(data[idx+0], data[idx+1]);
if ( data[idx+2] < 5. && insideWorld(v) ) {
data[idx+0] += 0.01 * cos(v.x*sin(v.y));
data[idx+1] += 0.01 * sin(v.x-v.y);
data[idx+2] += 0.01;
} else {
data[idx+0] = -(world.x/2.) + rand(vec2(data[idx+1], data[idx+0])) * world.x;
data[idx+1] = -(world.y/2.) + rand(vec2(data[idx+0], data[idx+1])) * world.y;
data[idx+2] = uint(rand(v) * 5.);
}
}
)";
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