__global__ void rotateKernel(int* oldImage, int* newImage, int rows, int cols, float rads) {

'''int c''' = blockIdx.x * blockDim.x + threadIdx.x;

'''int r''' = blockIdx.y * blockDim.y + threadIdx.y;

int r0 = rows / 2;

int c0 = cols / 2;

float sinRads = sinf(rads);

float cosRads = cosf(rads);

if (r < rows && c < cols)

{

int r1 = (int)(r0 + ((r - r0) * cosRads) - ((c - c0) * sinRads));

int c1 = (int)(c0 + ((r - r0) * sinRads) + ((c - c0) * cosRads));

if (inBounds(r1, c1, rows, cols))

{

newImage[r1 * cols + c1] = oldImage[r * cols + c];

}

}

Using Coalesced Memory (changed matrix access from column to row)

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