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#version 450
#version 450


#define WIDTH 800
#define WIDTH 800
#define HEIGHT 600
#define HEIGHT 600
#define WORKGROUP_SIZE 32
#define WORKGROUP_SIZE 32


layout (local_size_x = WORKGROUP_SIZE, local_size_y = WORKGROUP_SIZE, local_size_z = 1) in;
layout (local_size_x = WORKGROUP_SIZE, local_size_y = WORKGROUP_SIZE, local_size_z = 1) in;


layout(binding = 0) readonly buffer buf1 {
layout(binding = 0) readonly buffer buf1 {
int data[WIDTH][HEIGHT];
int data[HEIGHT][WIDTH];
} previousBoard;
} previousBoard;


layout(binding = 1) buffer buf2 {
layout(binding = 1) buffer buf2 {
int data[WIDTH][HEIGHT];
int data[HEIGHT][WIDTH];
} nextBoard;
} nextBoard;


void main() {
void main() {


int x = int(gl_GlobalInvocationID.x);
int x = int(gl_GlobalInvocationID.x);
int y = int(gl_GlobalInvocationID.y);
int y = int(gl_GlobalInvocationID.y);


if(x >= WIDTH || y >= HEIGHT)
if(x >= WIDTH || y >= HEIGHT)
return;
return;
uint countNeighboors = 0;
uint countNeighboors = 0;
if (y > 0)
if (y > 0)
{
{
if (x > 0)
if (x > 0)
{
{
// x - 1 ; y - 1
// x - 1 ; y - 1
countNeighboors += previousBoard.data[x - 1][y - 1];
countNeighboors += previousBoard.data[y - 1][x - 1];
}
}
// x ; y - 1
// x ; y - 1
countNeighboors += previousBoard.data[x][y - 1];
countNeighboors += previousBoard.data[y - 1][x];
if(x < 799)
if(x < 799)
{
{
// x + 1 ; y - 1
// x + 1 ; y - 1
countNeighboors += previousBoard.data[x + 1][y - 1];
countNeighboors += previousBoard.data[y - 1][x + 1];
}
}
}
}
if (x > 0)
if (x > 0)
{
{
// x - 1 ; y
// x - 1 ; y
countNeighboors += previousBoard.data[x - 1][y];
countNeighboors += previousBoard.data[y][x - 1];
}
}
if(x < 799)
if(x < 799)
{
{
// x + 1 ; y
// x + 1 ; y
countNeighboors += previousBoard.data[x + 1][y];
countNeighboors += previousBoard.data[y][x + 1];
}
}
if (y < 599)
if (y < 599)
{
{
if (x > 0)
if (x > 0)
{
{
// x - 1 ; y + 1
// x - 1 ; y + 1
countNeighboors += previousBoard.data[x - 1][y + 1];
countNeighboors += previousBoard.data[y + 1][x - 1];
}
}
// x ; y + 1
// x ; y + 1
countNeighboors += previousBoard.data[x][y + 1];
countNeighboors += previousBoard.data[y + 1][x];
if(x < 799)
if(x < 799)
{
{
// x + 1 ; y + 1
// x + 1 ; y + 1
countNeighboors += previousBoard.data[x + 1][y + 1];
countNeighboors += previousBoard.data[y + 1][x + 1];
}
}
}
}
if(countNeighboors == 3)
if(countNeighboors == 3)
{
{
nextBoard.data[x][y] = 1;
nextBoard.data[y][x] = 1;
}
}
else if (countNeighboors == 2)
else if (countNeighboors == 2)
{
{
nextBoard.data[x][y] = previousBoard.data[x][y];
nextBoard.data[y][x] = previousBoard.data[y][x];
}
}
else
else
{
{
nextBoard.data[x][y] = 0;
nextBoard.data[y][x] = 0;
}
}
}
}


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