diff options
Diffstat (limited to 'shaders/cl/kernel_tonemapping.cl')
| -rw-r--r-- | shaders/cl/kernel_tonemapping.cl | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/shaders/cl/kernel_tonemapping.cl b/shaders/cl/kernel_tonemapping.cl new file mode 100644 index 0000000..2f239ca --- /dev/null +++ b/shaders/cl/kernel_tonemapping.cl @@ -0,0 +1,106 @@ +/* + * function: kernel_tonemapping + * implementation of tone mapping + * input: image2d_t as read only + * output: image2d_t as write only + */ + +#define WORK_ITEM_X_SIZE 8 +#define WORK_ITEM_Y_SIZE 8 + +#define SHARED_PIXEL_X_SIZE 10 +#define SHARED_PIXEL_Y_SIZE 10 + +__kernel void kernel_tonemapping (__read_only image2d_t input, __write_only image2d_t output, float y_max, float y_target, int image_height) +{ + int g_id_x = get_global_id (0); + int g_id_y = get_global_id (1); + + int group_id_x = get_group_id(0); + int group_id_y = get_group_id(1); + + int local_id_x = get_local_id(0); + int local_id_y = get_local_id(1); + + int g_size_x = get_global_size (0); + int g_size_y = get_global_size (1); + + int local_index = local_id_y * WORK_ITEM_X_SIZE + local_id_x; + + sampler_t sampler = CLK_NORMALIZED_COORDS_FALSE | CLK_ADDRESS_CLAMP_TO_EDGE | CLK_FILTER_NEAREST; + + __local float4 local_src_data[SHARED_PIXEL_X_SIZE * SHARED_PIXEL_Y_SIZE]; + + float4 src_data_Gr = read_imagef (input, sampler, (int2)(g_id_x, g_id_y)); + float4 src_data_R = read_imagef (input, sampler, (int2)(g_id_x, g_id_y + image_height)); + float4 src_data_B = read_imagef (input, sampler, (int2)(g_id_x, g_id_y + image_height * 2)); + float4 src_data_Gb = read_imagef (input, sampler, (int2)(g_id_x, g_id_y + image_height * 3)); + + float4 src_data_G = (src_data_Gr + src_data_Gb) / 2; + + float4 src_y_data = 0.0f; + src_y_data = mad(src_data_R, 255.f * 0.299f, src_y_data); + src_y_data = mad(src_data_G, 255.f * 0.587f, src_y_data); + src_y_data = mad(src_data_B, 255.f * 0.114f, src_y_data); + + local_src_data[(local_id_y + 1) * SHARED_PIXEL_X_SIZE + local_id_x + 1] = src_y_data; + + if(local_index < SHARED_PIXEL_X_SIZE * SHARED_PIXEL_Y_SIZE - WORK_ITEM_X_SIZE * WORK_ITEM_Y_SIZE) + { + int target_index = local_index <= SHARED_PIXEL_X_SIZE ? local_index : (local_index <= (SHARED_PIXEL_X_SIZE * SHARED_PIXEL_Y_SIZE - WORK_ITEM_X_SIZE * WORK_ITEM_Y_SIZE - SHARED_PIXEL_X_SIZE) ? (local_index + WORK_ITEM_X_SIZE + (local_index - (SHARED_PIXEL_X_SIZE + 1)) / 2 * WORK_ITEM_X_SIZE) : (local_index + WORK_ITEM_X_SIZE * WORK_ITEM_Y_SIZE)); + int start_x = mad24(group_id_x, WORK_ITEM_X_SIZE, -1); + int start_y = mad24(group_id_y, WORK_ITEM_Y_SIZE, -1); + int offset_x = target_index % SHARED_PIXEL_X_SIZE; + int offset_y = target_index / SHARED_PIXEL_X_SIZE; + + float4 data_Gr = read_imagef (input, sampler, (int2)(start_x + offset_x, start_y + offset_y)); + float4 data_R = read_imagef (input, sampler, (int2)(start_x + offset_x, start_y + offset_y + image_height)); + float4 data_B = read_imagef (input, sampler, (int2)(start_x + offset_x, start_y + offset_y + image_height * 2)); + float4 data_Gb = read_imagef (input, sampler, (int2)(start_x + offset_x, start_y + offset_y + image_height * 3)); + + float4 data_G = (data_Gr + data_Gb) / 2; + + float4 y_data = 0.0f; + y_data = mad(data_R, 255.f * 0.299f, y_data); + y_data = mad(data_G, 255.f * 0.587f, y_data); + y_data = mad(data_B, 255.f * 0.114f, y_data); + local_src_data[target_index] = y_data; + } + + barrier(CLK_LOCAL_MEM_FENCE); + + float gaussian_table[9] = {0.075f, 0.124f, 0.075f, + 0.124f, 0.204f, 0.124f, + 0.075f, 0.124f, 0.075f + }; + float4 src_ym_data = 0.0f; + + float16 integrate_data = *((__local float16 *)(local_src_data + local_id_y * SHARED_PIXEL_X_SIZE + local_id_x)); + + src_ym_data = mad(integrate_data.s3456, (float4)gaussian_table[0], src_ym_data); + src_ym_data = mad(integrate_data.s4567, (float4)gaussian_table[1], src_ym_data); + src_ym_data = mad(integrate_data.s5678, (float4)gaussian_table[2], src_ym_data); + + integrate_data = *((__local float16 *)(local_src_data + (local_id_y + 1) * SHARED_PIXEL_X_SIZE + local_id_x)); + + src_ym_data = mad(integrate_data.s3456, (float4)gaussian_table[3], src_ym_data); + src_ym_data = mad(src_y_data, (float4)gaussian_table[4], src_ym_data); + src_ym_data = mad(integrate_data.s5678, (float4)gaussian_table[5], src_ym_data); + + integrate_data = *((__local float16 *)(local_src_data + (local_id_y + 2) * SHARED_PIXEL_X_SIZE + local_id_x)); + + src_ym_data = mad(integrate_data.s3456, (float4)gaussian_table[6], src_ym_data); + src_ym_data = mad(integrate_data.s4567, (float4)gaussian_table[7], src_ym_data); + src_ym_data = mad(integrate_data.s5678, (float4)gaussian_table[8], src_ym_data); + + float4 gain = ((float4)(y_max + y_target) + src_ym_data) / (src_y_data + src_ym_data + (float4)y_target); + src_data_Gr = src_data_Gr * gain; + src_data_R = src_data_R * gain; + src_data_B = src_data_B * gain; + src_data_Gb = src_data_Gb * gain; + + write_imagef(output, (int2)(g_id_x, g_id_y), src_data_Gr); + write_imagef(output, (int2)(g_id_x, g_id_y + image_height), src_data_R); + write_imagef(output, (int2)(g_id_x, g_id_y + image_height * 2), src_data_B); + write_imagef(output, (int2)(g_id_x, g_id_y + image_height * 3), src_data_Gb); +} |