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#version 430
// Game of life transfert shader
#define GOL_WIDTH 768
// Game Of Life Update Command
// NOTE: matches the structure defined on main program
struct GolUpdateCmd {
uint x; // x coordinate of the gol command
uint y; // y coordinate of the gol command
uint w; // width of the filled zone
uint enabled; // whether to enable or disable zone
};
// Local compute unit size
layout (local_size_x = 1, local_size_y = 1, local_size_z = 1) in;
// Output game of life grid buffer
layout(std430, binding = 1) buffer golBufferLayout
{
uint golBuffer[]; // golBuffer[x, y] = golBuffer[x + GOL_WIDTH * y]
};
// Command buffer
layout(std430, binding = 3) readonly restrict buffer golUpdateLayout
{
uint count;
GolUpdateCmd commands[];
};
#define isInside(x, y) (((x) >= 0) && ((y) >= 0) && ((x) < GOL_WIDTH) && ((y) < GOL_WIDTH))
#define getBufferIndex(x, y) ((x) + GOL_WIDTH * (y))
void main()
{
uint cmdIndex = gl_GlobalInvocationID.x;
GolUpdateCmd cmd = commands[cmdIndex];
for (uint x = cmd.x; x < (cmd.x + cmd.w); x++)
{
for (uint y = cmd.y; y < (cmd.y + cmd.w); y++)
{
if (isInside(x, y))
{
if (cmd.enabled != 0) atomicOr(golBuffer[getBufferIndex(x, y)], 1);
else atomicAnd(golBuffer[getBufferIndex(x, y)], 0);
}
}
}
}
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