diff options
Diffstat (limited to 'cuda-global/src/game.cu')
| -rw-r--r-- | cuda-global/src/game.cu | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/cuda-global/src/game.cu b/cuda-global/src/game.cu index b0b5f61..abb5ed9 100644 --- a/cuda-global/src/game.cu +++ b/cuda-global/src/game.cu @@ -1,11 +1,12 @@ #include "game.cuh" +// Count the number of life neighbors a cell has __device__ int neighbors(struct GAME game, int x, int y) { int n = 0; for (int dy = -1; dy <= 1; dy++) { for (int dx = -1; dx <= 1; dx++) { - if (!(dx == 0 && dy == 0) && (x+dx) >= 0 && (y+dy) >= 0 && (x+dx) < game.width+(game.padding*2) && (y+dy) < game.height+(game.padding*2)) { + if (!(dx == 0 && dy == 0) && (x+dx) > 0 && (y+dy) > 0 && (x+dx) < game.width+(game.padding*2) && (y+dy) < game.height+(game.padding*2)) { if (game.grid[(y+dy) * (game.width+game.padding*2) + (x+dx)]) { n++; } @@ -15,11 +16,14 @@ __device__ int neighbors(struct GAME game, int x, int y) { return n; } +// Compute the next iteration of a board +// We have to give it the newGrid as a parameter otherwise +// each block will be computing its own version of the next grid __global__ void next(struct GAME game, unsigned char* newGrid) { int idy = blockDim.y * blockIdx.y + threadIdx.y; int idx = blockDim.x * blockIdx.x + threadIdx.x; - if (idy <= game.height+game.padding*2 && idx <= game.width+game.padding*2) { + if (idy < game.height+game.padding*2 && idx < game.width+game.padding*2) { int my_neighbors = neighbors(game, idx, idy); int my_coord = idy * (game.width+game.padding*2) + idx; newGrid[my_coord] = 0; // It's possible that there are artifacts from the last iteration @@ -37,6 +41,7 @@ __global__ void next(struct GAME game, unsigned char* newGrid) { } } +// Randomly assign life value to each cell void randomize(struct GAME* game) { for (int y = game->padding; y < game->height+game->padding; y++) { for (int x = game->padding; x < game->width+game->padding; x++) { |