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#version 440
// Resets every particle to its grid position and to white. Dispatched
// directly (not via dispatchIndirect) every frame, so the subsequent
// indirect dispatch's red "paint" strictly reflects what it touched this
// frame only.
layout (local_size_x = 256) in;
struct Particle
{
vec4 pos;
vec4 color;
};
layout(std430, binding = 0) buffer ParticleBuf
{
Particle particles[];
} buf;
void main()
{
uint row = gl_WorkGroupID.x;
uint col = gl_LocalInvocationID.x;
uint index = row * 256u + col;
float restX = -1.0 + 2.0 * (float(col) + 0.5) / 256.0;
float restY = 1.0 - 2.0 * (float(row) + 0.5) / 128.0;
buf.particles[index].pos = vec4(restX, restY, 0.0, 1.0);
buf.particles[index].color = vec4(1.0, 1.0, 1.0, 1.0);
}