tdesktop/Telegram/shaders/thanos_init.comp at dev · feiyunwill/tdesktop · GitHub

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#version 450

layout(local_size_x = 64) in;

layout(rgba32f, binding = 0) uniform image2D particleStateImage;

layout(rgba32f, binding = 2) uniform image2D particleVelocityImage;

layout(std140, binding = 1) uniform Params {

uint particleCountX;

uint particleCountY;

uint seed;

uint _pad;

};

uint hash(uint x) {

x ^= x >> 16u;

x *= 0x45d9f3bu;

x ^= x >> 16u;

x *= 0x45d9f3bu;

x ^= x >> 16u;

return x;

}

float hashFloat(uint x) {

return float(hash(x)) / float(0xFFFFFFFFu);

}

void main() {

uint gid = gl_GlobalInvocationID.x;

uint count = particleCountX * particleCountY;

if (gid >= count) {

return;

}

uint s = gid * 3u + seed;

float direction = hashFloat(s) * (3.14159265 * 2.0);

float speed = (0.1 + hashFloat(s + 1u) * 0.1) * 320.0;

vec2 velocity = vec2(cos(direction) * speed, sin(direction) * speed);

float lifetime = 1.5 + hashFloat(s + 2u) * 1.5;

ivec2 coord = ivec2(

int(gid % particleCountX),

int(gid / particleCountX));

imageStore(particleStateImage, coord, vec4(0.0, 0.0, lifetime, 0.0));

imageStore(particleVelocityImage, coord, vec4(velocity, 0.0, 0.0));

}

tdesktop/Telegram/shaders/thanos_init.comp at dev · feiyunwill/tdesktop · GitHub

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