public static void Sobel(cudaTextureObject_t texObj, float[] output, int width, int height) //make output to be a surface
{
for (int i = threadIdx.y + blockIdx.y * blockDim.y; i < height; i += blockDim.y * gridDim.y)
{
for (int j = threadIdx.x + blockIdx.x * blockDim.x; j < width; j += blockDim.x * gridDim.x)
{
int pixelId = i * width + j;
if (i != 0 && j != 0 && i != height - 1 && j != width - 1)
{
float tl = TextureHelpers.tex2D(texObj, j - 1.0F, i - 1.0F);
float t = TextureHelpers.tex2D(texObj, j - 1.0F, i);
float tr = TextureHelpers.tex2D(texObj, j - 1.0F, i + 1.0F);
float l = TextureHelpers.tex2D(texObj, j, i - 1.0F);
float r = TextureHelpers.tex2D(texObj, j, i + 1.0F);
float br = TextureHelpers.tex2D(texObj, j + 1.0F, i + 1.0F);
float bl = TextureHelpers.tex2D(texObj, j + 1.0F, i - 1.0F);
float b = TextureHelpers.tex2D(texObj, j + 1.0F, i);
float data = (Math.Abs((tl + 2.0F * l + bl - tr - 2.0F * r - br)) +
Math.Abs((tl + 2.0F * t + tr - bl - 2.0F * b - br)));
if (data > 255)
{
data = 255;
}
output[pixelId] = data;
}
else
{
output[pixelId] = 0;
}
}
}
}
public static void Sobel(cudaTextureObject_t texObj, cudaSurfaceObject_t surfObj, int width, int height)
{
for (int i = threadIdx.y + blockIdx.y * blockDim.y; i < height; i += blockDim.y * gridDim.y)
{
for (int j = threadIdx.x + blockIdx.x * blockDim.x; j < width; j += blockDim.x * gridDim.x)
{
int pixelId = i * width + j;
if (i != 0 && j != 0 && i != height - 1 && j != width - 1)
{
float tl = TextureHelpers.tex2D(texObj, j - 1.0F, i - 1.0F);
float t = TextureHelpers.tex2D(texObj, j - 1.0F, i);
float tr = TextureHelpers.tex2D(texObj, j - 1.0F, i + 1.0F);
float l = TextureHelpers.tex2D(texObj, j, i - 1.0F);
float r = TextureHelpers.tex2D(texObj, j, i + 1.0F);
float br = TextureHelpers.tex2D(texObj, j + 1.0F, i + 1.0F);
float bl = TextureHelpers.tex2D(texObj, j + 1.0F, i - 1.0F);
float b = TextureHelpers.tex2D(texObj, j + 1.0F, i);
float data = (Math.Abs((tl + 2.0F * l + bl - tr - 2.0F * r - br)) +
Math.Abs((tl + 2.0F * t + tr - bl - 2.0F * b - br)));
if (data > 255)
{
data = 255;
}
TextureHelpers.surf2Dwrite(data, surfObj, j * sizeof(float), i);
}
else
{
TextureHelpers.surf2Dwrite(0.0F, surfObj, j * sizeof(float), i);
}
}
}
}
public static void Sobel(cudaTextureObject_t texObj, cudaSurfaceObject_t surfObj, int width, int height)
{
float ii, jj;
for (int i = threadIdx.y + blockIdx.y * blockDim.y; i < height; i += blockDim.y * gridDim.y)
{
ii = (float)i;
for (int j = threadIdx.x + blockIdx.x * blockDim.x; j < width; j += blockDim.x * gridDim.x)
{
if (i != 0 && j != 0 && i != height - 1 && j != width - 1)
{
jj = (float)j;
float tl = TextureHelpers.tex2D(texObj, jj - 1.0F, ii - 1.0F);
float t = TextureHelpers.tex2D(texObj, jj - 1.0F, ii);
float tr = TextureHelpers.tex2D(texObj, jj - 1.0F, ii + 1.0F);
float l = TextureHelpers.tex2D(texObj, jj, ii - 1.0F);
float r = TextureHelpers.tex2D(texObj, jj, ii + 1.0F);
float br = TextureHelpers.tex2D(texObj, jj + 1.0F, ii + 1.0F);
float bl = TextureHelpers.tex2D(texObj, jj + 1.0F, ii - 1.0F);
float b = TextureHelpers.tex2D(texObj, jj + 1.0F, ii);
float data = fabsf((tl + 2.0F * l + bl - tr - 2.0F * r - br)) +
fabsf((tl + 2.0F * t + tr - bl - 2.0F * b - br));
if (data > 255.0F)
{
data = 255.0F;
}
TextureHelpers.surf2Dwrite(data, surfObj, j * sizeof(int), i);
}
else
{
TextureHelpers.surf2Dwrite(0.0F, surfObj, j * sizeof(int), i);
}
}
}
}
public static float tex2D(cudaTextureObject_t texObj, float x, float y)
{
return(0.0F);
}
