opencl/texturize-canvas.cl


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29

__kernel cl_texturize_canvas(__global const float * in,
                             __global float * out,
                             __global float * sdata,
                             const int x,
                             const int y,
                             const int xm,
                             const int ym,
                             const int offs,
                             const float mult,
                             const int components,
                             const int has_alpha)
{
    int col = get_global_id(0);
    int row = get_global_id(1);
    int step = components + has_alpha;
    int index = step * (row * get_global_size(0) + col);
    int canvas_index = ((x + col) & 127) * xm +
                       ((y + row) & 127) * ym + offs;
    float color;
    int i;
    float tmp = mult * sdata[canvas_index];
    for(i=0; i<components; ++i)
    {
       color = tmp + src[index];
       out[index++] = clamp(color,0.0f,1.0f);
    }
    if(has_alpha)
       out[index] = in[index];
}