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74 lines
1.8 KiB
74 lines
1.8 KiB
// #define TEST
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#define X 100
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#define Y 100
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//#define USE_DBL
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#ifdef USE_DBL
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#define TYPE_FLT double
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#define TYPE_INT long
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#define MASK 0xFFFF
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#define SHIFT 16
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#define EPSILSON 4.94065645841247E-324
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#else
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#define TYPE_FLT float
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#define TYPE_INT int
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#define MASK 0x00FF
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#define SHIFT 8
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#define EPSILSON 1.401298E-45
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#endif
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constant sampler_t sampler = CLK_NORMALIZED_COORDS_FALSE |
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CLK_ADDRESS_CLAMP_TO_EDGE |
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CLK_FILTER_LINEAR;
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struct input {
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int gray_map_selector;
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};
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TYPE_FLT read_data(image2d_t input_frame, int x, int z)
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{
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int2 gid = (int2)(x, z);
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uint4 pixel = read_imageui(input_frame, sampler, gid);
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TYPE_INT temp = (TYPE_INT)((TYPE_INT)pixel.x & MASK) |
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(TYPE_INT)(((TYPE_INT)pixel.y & MASK) << SHIFT) |
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(TYPE_INT)(((TYPE_INT)pixel.z & MASK) << (SHIFT * 2)) |
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(TYPE_INT)(((TYPE_INT)pixel.w & MASK) << (SHIFT * 3));
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TYPE_FLT raw_data = *((TYPE_FLT*)(&temp));
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return raw_data;
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}
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kernel void GrayMap(read_only image2d_t input_frame, read_write image2d_t output_frame, struct input params)
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{
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int2 gid = (int2)(get_global_id(0), get_global_id(1));
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TYPE_FLT input = read_data(input_frame, gid.x, gid.y);
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TYPE_FLT output_data = 0;
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double gama[17] = {0.05, 0.1, 0.2, 0.3, 0.4, 0.5, 0.67, 0.75, 1, 1.33, 1.5, 2, 2.5, 3.33, 5, 10, 20};
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if(params.gray_map_selector == 17)
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{
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output_data = 255 * log2(input / 255 + 1);
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}
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else
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{
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output_data = 255 * pow((input / 255.0), gama[params.gray_map_selector]);
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}
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uchar out = (uchar)output_data;
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#ifdef TEST
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if(gid.x == X && gid.y == Y)
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printf("%u ---", out);
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#endif
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uint4 pixel;
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pixel.x = out;
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pixel.y = out;
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pixel.z = out;
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pixel.w = 255;
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write_imageui(output_frame, gid, pixel);
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}
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