| wangfei | 7e0436e | 2015-04-15 19:22:36 +0800 | [diff] [blame] | 1 | /* |
| 2 | * function: kernel_gamma |
| 3 | * input: image2d_t as read only |
| 4 | * output: image2d_t as write only |
| 5 | * table: gamma table. |
| 6 | */ |
| 7 | "__kernel void kernel_gamma (__read_only image2d_t input, __write_only image2d_t output, __global float *table) " |
| 8 | "{ " |
| 9 | " int x = get_global_id (0); " |
| 10 | " int y = get_global_id (1); " |
| 11 | " sampler_t sampler = CLK_NORMALIZED_COORDS_FALSE | CLK_ADDRESS_NONE | CLK_FILTER_NEAREST; " |
| 12 | " int2 pos = (int2)(x, y); " |
| 13 | " float4 pixel_in,pixel_out; " |
| 14 | " pixel_in = read_imagef(input, sampler, pos); " |
| 15 | " pixel_out.x = table[convert_int(pixel_in.x*255.0)]/255.0; " |
| 16 | " pixel_out.y = table[convert_int(pixel_in.y*255.0)]/255.0; " |
| 17 | " pixel_out.z = table[convert_int(pixel_in.z*255.0)]/255.0; " |
| 18 | " pixel_out.w = 0.0; " |
| 19 | " write_imagef(output, pos, pixel_out); " |
| 20 | "} " |
| 21 | |