Masks: feather self-intersection collapse function
[blender.git] / intern / cycles / device / device_opencl.cpp
1 /*
2  * Copyright 2011, Blender Foundation.
3  *
4  * This program is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU General Public License
6  * as published by the Free Software Foundation; either version 2
7  * of the License, or (at your option) any later version.
8  *
9  * This program is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12  * GNU General Public License for more details.
13  *
14  * You should have received a copy of the GNU General Public License
15  * along with this program; if not, write to the Free Software Foundation,
16  * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
17  */
18
19 #ifdef WITH_OPENCL
20
21 #include <stdio.h>
22 #include <stdlib.h>
23 #include <string.h>
24
25 #include "device.h"
26 #include "device_intern.h"
27
28 #include "util_foreach.h"
29 #include "util_map.h"
30 #include "util_math.h"
31 #include "util_md5.h"
32 #include "util_opencl.h"
33 #include "util_opengl.h"
34 #include "util_path.h"
35 #include "util_time.h"
36
37 CCL_NAMESPACE_BEGIN
38
39 #define CL_MEM_PTR(p) ((cl_mem)(unsigned long)(p))
40
41 class OpenCLDevice : public Device
42 {
43 public:
44         cl_context cxContext;
45         cl_command_queue cqCommandQueue;
46         cl_platform_id cpPlatform;
47         cl_device_id cdDevice;
48         cl_program cpProgram;
49         cl_kernel ckPathTraceKernel;
50         cl_kernel ckFilmConvertKernel;
51         cl_int ciErr;
52         map<string, device_vector<uchar>*> const_mem_map;
53         map<string, device_memory*> mem_map;
54         device_ptr null_mem;
55         bool device_initialized;
56         string platform_name;
57
58         const char *opencl_error_string(cl_int err)
59         {
60                 switch (err) {
61                         case CL_SUCCESS: return "Success!";
62                         case CL_DEVICE_NOT_FOUND: return "Device not found.";
63                         case CL_DEVICE_NOT_AVAILABLE: return "Device not available";
64                         case CL_COMPILER_NOT_AVAILABLE: return "Compiler not available";
65                         case CL_MEM_OBJECT_ALLOCATION_FAILURE: return "Memory object allocation failure";
66                         case CL_OUT_OF_RESOURCES: return "Out of resources";
67                         case CL_OUT_OF_HOST_MEMORY: return "Out of host memory";
68                         case CL_PROFILING_INFO_NOT_AVAILABLE: return "Profiling information not available";
69                         case CL_MEM_COPY_OVERLAP: return "Memory copy overlap";
70                         case CL_IMAGE_FORMAT_MISMATCH: return "Image format mismatch";
71                         case CL_IMAGE_FORMAT_NOT_SUPPORTED: return "Image format not supported";
72                         case CL_BUILD_PROGRAM_FAILURE: return "Program build failure";
73                         case CL_MAP_FAILURE: return "Map failure";
74                         case CL_INVALID_VALUE: return "Invalid value";
75                         case CL_INVALID_DEVICE_TYPE: return "Invalid device type";
76                         case CL_INVALID_PLATFORM: return "Invalid platform";
77                         case CL_INVALID_DEVICE: return "Invalid device";
78                         case CL_INVALID_CONTEXT: return "Invalid context";
79                         case CL_INVALID_QUEUE_PROPERTIES: return "Invalid queue properties";
80                         case CL_INVALID_COMMAND_QUEUE: return "Invalid command queue";
81                         case CL_INVALID_HOST_PTR: return "Invalid host pointer";
82                         case CL_INVALID_MEM_OBJECT: return "Invalid memory object";
83                         case CL_INVALID_IMAGE_FORMAT_DESCRIPTOR: return "Invalid image format descriptor";
84                         case CL_INVALID_IMAGE_SIZE: return "Invalid image size";
85                         case CL_INVALID_SAMPLER: return "Invalid sampler";
86                         case CL_INVALID_BINARY: return "Invalid binary";
87                         case CL_INVALID_BUILD_OPTIONS: return "Invalid build options";
88                         case CL_INVALID_PROGRAM: return "Invalid program";
89                         case CL_INVALID_PROGRAM_EXECUTABLE: return "Invalid program executable";
90                         case CL_INVALID_KERNEL_NAME: return "Invalid kernel name";
91                         case CL_INVALID_KERNEL_DEFINITION: return "Invalid kernel definition";
92                         case CL_INVALID_KERNEL: return "Invalid kernel";
93                         case CL_INVALID_ARG_INDEX: return "Invalid argument index";
94                         case CL_INVALID_ARG_VALUE: return "Invalid argument value";
95                         case CL_INVALID_ARG_SIZE: return "Invalid argument size";
96                         case CL_INVALID_KERNEL_ARGS: return "Invalid kernel arguments";
97                         case CL_INVALID_WORK_DIMENSION: return "Invalid work dimension";
98                         case CL_INVALID_WORK_GROUP_SIZE: return "Invalid work group size";
99                         case CL_INVALID_WORK_ITEM_SIZE: return "Invalid work item size";
100                         case CL_INVALID_GLOBAL_OFFSET: return "Invalid global offset";
101                         case CL_INVALID_EVENT_WAIT_LIST: return "Invalid event wait list";
102                         case CL_INVALID_EVENT: return "Invalid event";
103                         case CL_INVALID_OPERATION: return "Invalid operation";
104                         case CL_INVALID_GL_OBJECT: return "Invalid OpenGL object";
105                         case CL_INVALID_BUFFER_SIZE: return "Invalid buffer size";
106                         case CL_INVALID_MIP_LEVEL: return "Invalid mip-map level";
107                         default: return "Unknown";
108                 }
109         }
110
111         bool opencl_error(cl_int err)
112         {
113                 if(err != CL_SUCCESS) {
114                         string message = string_printf("OpenCL error (%d): %s", err, opencl_error_string(err));
115                         if(error_msg == "")
116                                 error_msg = message;
117                         fprintf(stderr, "%s\n", message.c_str());
118                         return true;
119                 }
120
121                 return false;
122         }
123
124         void opencl_error(const string& message)
125         {
126                 if(error_msg == "")
127                         error_msg = message;
128                 fprintf(stderr, "%s\n", message.c_str());
129         }
130
131         void opencl_assert(cl_int err)
132         {
133                 if(err != CL_SUCCESS) {
134                         string message = string_printf("OpenCL error (%d): %s", err, opencl_error_string(err));
135                         if(error_msg == "")
136                                 error_msg = message;
137                         fprintf(stderr, "%s\n", message.c_str());
138 #ifndef NDEBUG
139                         abort();
140 #endif
141                 }
142         }
143
144         OpenCLDevice(DeviceInfo& info, bool background_)
145         {
146                 background = background_;
147                 cpPlatform = NULL;
148                 cxContext = NULL;
149                 cqCommandQueue = NULL;
150                 cpProgram = NULL;
151                 ckPathTraceKernel = NULL;
152                 ckFilmConvertKernel = NULL;
153                 null_mem = 0;
154                 device_initialized = false;
155
156                 /* setup platform */
157                 cl_uint num_platforms;
158
159                 ciErr = clGetPlatformIDs(0, NULL, &num_platforms);
160                 if(opencl_error(ciErr))
161                         return;
162
163                 if(num_platforms == 0) {
164                         opencl_error("OpenCL: no platforms found.");
165                         return;
166                 }
167
168                 ciErr = clGetPlatformIDs(1, &cpPlatform, NULL);
169                 if(opencl_error(ciErr))
170                         return;
171
172                 char name[256];
173                 clGetPlatformInfo(cpPlatform, CL_PLATFORM_NAME, sizeof(name), &name, NULL);
174                 platform_name = name;
175
176                 /* get devices */
177                 vector<cl_device_id> device_ids;
178                 cl_uint num_devices;
179
180                 if(opencl_error(clGetDeviceIDs(cpPlatform, CL_DEVICE_TYPE_GPU|CL_DEVICE_TYPE_ACCELERATOR, 0, NULL, &num_devices)))
181                         return;
182
183                 if(info.num > num_devices) {
184                         if(num_devices == 0)
185                                 opencl_error("OpenCL: no devices found.");
186                         else
187                                 opencl_error("OpenCL: specified device not found.");
188                         return;
189                 }
190
191                 device_ids.resize(num_devices);
192                 
193                 if(opencl_error(clGetDeviceIDs(cpPlatform, CL_DEVICE_TYPE_GPU|CL_DEVICE_TYPE_ACCELERATOR, num_devices, &device_ids[0], NULL)))
194                         return;
195
196                 cdDevice = device_ids[info.num];
197
198                 /* create context */
199                 cxContext = clCreateContext(0, 1, &cdDevice, NULL, NULL, &ciErr);
200                 if(opencl_error(ciErr))
201                         return;
202
203                 cqCommandQueue = clCreateCommandQueue(cxContext, cdDevice, 0, &ciErr);
204                 if(opencl_error(ciErr))
205                         return;
206
207                 null_mem = (device_ptr)clCreateBuffer(cxContext, CL_MEM_READ_ONLY, 1, NULL, &ciErr);
208                 device_initialized = true;
209         }
210
211         bool opencl_version_check()
212         {
213                 char version[256];
214
215                 int major, minor, req_major = 1, req_minor = 0;
216
217                 clGetPlatformInfo(cpPlatform, CL_PLATFORM_VERSION, sizeof(version), &version, NULL);
218
219                 if(sscanf(version, "OpenCL %d.%d", &major, &minor) < 2) {
220                         opencl_error(string_printf("OpenCL: failed to parse platform version string (%s).", version));
221                         return false;
222                 }
223
224                 if(!((major == req_major && minor >= req_minor) || (major > req_major))) {
225                         opencl_error(string_printf("OpenCL: platform version 1.1 or later required, found %d.%d", major, minor));
226                         return false;
227                 }
228
229                 clGetDeviceInfo(cdDevice, CL_DEVICE_OPENCL_C_VERSION, sizeof(version), &version, NULL);
230
231                 if(sscanf(version, "OpenCL C %d.%d", &major, &minor) < 2) {
232                         opencl_error(string_printf("OpenCL: failed to parse OpenCL C version string (%s).", version));
233                         return false;
234                 }
235
236                 if(!((major == req_major && minor >= req_minor) || (major > req_major))) {
237                         opencl_error(string_printf("OpenCL: C version 1.1 or later required, found %d.%d", major, minor));
238                         return false;
239                 }
240
241                 /* we don't check CL_DEVICE_VERSION since for e.g. nvidia sm 1.3 cards this is
242                  * 1.0 even if the language features are there, just limited shared memory */
243
244                 return true;
245         }
246
247         bool load_binary(const string& kernel_path, const string& clbin)
248         {
249                 /* read binary into memory */
250                 vector<uint8_t> binary;
251
252                 if(!path_read_binary(clbin, binary)) {
253                         opencl_error(string_printf("OpenCL failed to read cached binary %s.", clbin.c_str()));
254                         return false;
255                 }
256
257                 /* create program */
258                 cl_int status;
259                 size_t size = binary.size();
260                 const uint8_t *bytes = &binary[0];
261
262                 cpProgram = clCreateProgramWithBinary(cxContext, 1, &cdDevice,
263                         &size, &bytes, &status, &ciErr);
264
265                 if(opencl_error(status) || opencl_error(ciErr)) {
266                         opencl_error(string_printf("OpenCL failed create program from cached binary %s.", clbin.c_str()));
267                         return false;
268                 }
269
270                 if(!build_kernel(kernel_path))
271                         return false;
272
273                 return true;
274         }
275
276         bool save_binary(const string& clbin)
277         {
278                 size_t size = 0;
279                 clGetProgramInfo(cpProgram, CL_PROGRAM_BINARY_SIZES, sizeof(size_t), &size, NULL);
280
281                 if(!size)
282                         return false;
283
284                 vector<uint8_t> binary(size);
285                 uint8_t *bytes = &binary[0];
286
287                 clGetProgramInfo(cpProgram, CL_PROGRAM_BINARIES, sizeof(uint8_t*), &bytes, NULL);
288
289                 if(!path_write_binary(clbin, binary)) {
290                         opencl_error(string_printf("OpenCL failed to write cached binary %s.", clbin.c_str()));
291                         return false;
292                 }
293
294                 return true;
295         }
296
297         string kernel_build_options()
298         {
299                 string build_options = " -cl-fast-relaxed-math ";
300                 
301                 /* Multi Closure for nVidia cards */
302                 if(platform_name == "NVIDIA CUDA")
303                         build_options += "-D__KERNEL_SHADING__ -D__KERNEL_OPENCL_NVIDIA__ -cl-nv-maxrregcount=24 -cl-nv-verbose ";
304                         
305                 /* No Float3 for Apple */
306                 else if(platform_name == "Apple")
307                         build_options += "-D__CL_NO_FLOAT3__ -D__KERNEL_OPENCL_APPLE__ ";
308                         
309                 /* Basic shading for AMD cards (non Apple) */
310                 else if(platform_name == "AMD Accelerated Parallel Processing")
311                         build_options += "-D__CL_NO_FLOAT3__ -D__KERNEL_OPENCL_AMD__ ";
312
313                 return build_options;
314         }
315
316         bool build_kernel(const string& kernel_path)
317         {
318                 string build_options = kernel_build_options();
319         
320                 ciErr = clBuildProgram(cpProgram, 0, NULL, build_options.c_str(), NULL, NULL);
321
322                 if(ciErr != CL_SUCCESS) {
323                         /* show build errors */
324                         char *build_log;
325                         size_t ret_val_size;
326
327                         clGetProgramBuildInfo(cpProgram, cdDevice, CL_PROGRAM_BUILD_LOG, 0, NULL, &ret_val_size);
328
329                         build_log = new char[ret_val_size+1];
330                         clGetProgramBuildInfo(cpProgram, cdDevice, CL_PROGRAM_BUILD_LOG, ret_val_size, build_log, NULL);
331
332                         build_log[ret_val_size] = '\0';
333                         opencl_error("OpenCL build failed: errors in console");
334                         fprintf(stderr, "%s\n", build_log);
335
336                         delete[] build_log;
337
338                         return false;
339                 }
340
341                 return true;
342         }
343
344         bool compile_kernel(const string& kernel_path, const string& kernel_md5)
345         {
346                 /* we compile kernels consisting of many files. unfortunately opencl
347                  * kernel caches do not seem to recognize changes in included files.
348                  * so we force recompile on changes by adding the md5 hash of all files */
349                 string source = "#include \"kernel.cl\" // " + kernel_md5 + "\n";
350                 source = path_source_replace_includes(source, kernel_path);
351
352                 size_t source_len = source.size();
353                 const char *source_str = source.c_str();
354
355                 cpProgram = clCreateProgramWithSource(cxContext, 1, &source_str, &source_len, &ciErr);
356
357                 if(opencl_error(ciErr))
358                         return false;
359
360                 double starttime = time_dt();
361                 printf("Compiling OpenCL kernel ...\n");
362
363                 if(!build_kernel(kernel_path))
364                         return false;
365
366                 printf("Kernel compilation finished in %.2lfs.\n", time_dt() - starttime);
367
368                 return true;
369         }
370
371         string device_md5_hash()
372         {
373                 MD5Hash md5;
374                 char version[256], driver[256], name[256], vendor[256];
375
376                 clGetPlatformInfo(cpPlatform, CL_PLATFORM_VENDOR, sizeof(vendor), &vendor, NULL);
377                 clGetDeviceInfo(cdDevice, CL_DEVICE_VERSION, sizeof(version), &version, NULL);
378                 clGetDeviceInfo(cdDevice, CL_DEVICE_NAME, sizeof(name), &name, NULL);
379                 clGetDeviceInfo(cdDevice, CL_DRIVER_VERSION, sizeof(driver), &driver, NULL);
380
381                 md5.append((uint8_t*)vendor, strlen(vendor));
382                 md5.append((uint8_t*)version, strlen(version));
383                 md5.append((uint8_t*)name, strlen(name));
384                 md5.append((uint8_t*)driver, strlen(driver));
385
386                 string options = kernel_build_options();
387                 md5.append((uint8_t*)options.c_str(), options.size());
388
389                 return md5.get_hex();
390         }
391
392         bool load_kernels(bool experimental)
393         {
394                 /* verify if device was initialized */
395                 if(!device_initialized) {
396                         fprintf(stderr, "OpenCL: failed to initialize device.\n");
397                         return false;
398                 }
399
400                 /* verify we have right opencl version */
401                 if(!opencl_version_check())
402                         return false;
403
404                 /* md5 hash to detect changes */
405                 string kernel_path = path_get("kernel");
406                 string kernel_md5 = path_files_md5_hash(kernel_path);
407                 string device_md5 = device_md5_hash();
408
409                 /* try to use cache binary */
410                 string clbin = string_printf("cycles_kernel_%s_%s.clbin", device_md5.c_str(), kernel_md5.c_str());
411                 clbin = path_user_get(path_join("cache", clbin));
412
413                 if(path_exists(clbin)) {
414                         /* if exists already, try use it */
415                         if(!load_binary(kernel_path, clbin))
416                                 return false;
417                 }
418                 else {
419                         /* compile kernel */
420                         if(!compile_kernel(kernel_path, kernel_md5))
421                                 return false;
422
423                         /* save binary for reuse */
424                         save_binary(clbin);
425                 }
426
427                 /* find kernels */
428                 ckPathTraceKernel = clCreateKernel(cpProgram, "kernel_ocl_path_trace", &ciErr);
429                 if(opencl_error(ciErr))
430                         return false;
431
432                 ckFilmConvertKernel = clCreateKernel(cpProgram, "kernel_ocl_tonemap", &ciErr);
433                 if(opencl_error(ciErr))
434                         return false;
435
436                 return true;
437         }
438
439         ~OpenCLDevice()
440         {
441                 if(null_mem)
442                         clReleaseMemObject(CL_MEM_PTR(null_mem));
443
444                 map<string, device_vector<uchar>*>::iterator mt;
445                 for(mt = const_mem_map.begin(); mt != const_mem_map.end(); mt++) {
446                         mem_free(*(mt->second));
447                         delete mt->second;
448                 }
449
450                 if(ckPathTraceKernel)
451                         clReleaseKernel(ckPathTraceKernel);  
452                 if(ckFilmConvertKernel)
453                         clReleaseKernel(ckFilmConvertKernel);  
454                 if(cpProgram)
455                         clReleaseProgram(cpProgram);
456                 if(cqCommandQueue)
457                         clReleaseCommandQueue(cqCommandQueue);
458                 if(cxContext)
459                         clReleaseContext(cxContext);
460         }
461
462         void mem_alloc(device_memory& mem, MemoryType type)
463         {
464                 size_t size = mem.memory_size();
465
466                 if(type == MEM_READ_ONLY)
467                         mem.device_pointer = (device_ptr)clCreateBuffer(cxContext, CL_MEM_READ_ONLY, size, NULL, &ciErr);
468                 else if(type == MEM_WRITE_ONLY)
469                         mem.device_pointer = (device_ptr)clCreateBuffer(cxContext, CL_MEM_WRITE_ONLY, size, NULL, &ciErr);
470                 else
471                         mem.device_pointer = (device_ptr)clCreateBuffer(cxContext, CL_MEM_READ_WRITE, size, NULL, &ciErr);
472
473                 opencl_assert(ciErr);
474         }
475
476         void mem_copy_to(device_memory& mem)
477         {
478                 /* this is blocking */
479                 size_t size = mem.memory_size();
480                 ciErr = clEnqueueWriteBuffer(cqCommandQueue, CL_MEM_PTR(mem.device_pointer), CL_TRUE, 0, size, (void*)mem.data_pointer, 0, NULL, NULL);
481                 opencl_assert(ciErr);
482         }
483
484         void mem_copy_from(device_memory& mem, int y, int w, int h, int elem)
485         {
486                 size_t offset = elem*y*w;
487                 size_t size = elem*w*h;
488
489                 ciErr = clEnqueueReadBuffer(cqCommandQueue, CL_MEM_PTR(mem.device_pointer), CL_TRUE, offset, size, (uchar*)mem.data_pointer + offset, 0, NULL, NULL);
490                 opencl_assert(ciErr);
491         }
492
493         void mem_zero(device_memory& mem)
494         {
495                 if(mem.device_pointer) {
496                         memset((void*)mem.data_pointer, 0, mem.memory_size());
497                         mem_copy_to(mem);
498                 }
499         }
500
501         void mem_free(device_memory& mem)
502         {
503                 if(mem.device_pointer) {
504                         ciErr = clReleaseMemObject(CL_MEM_PTR(mem.device_pointer));
505                         mem.device_pointer = 0;
506                         opencl_assert(ciErr);
507                 }
508         }
509
510         void const_copy_to(const char *name, void *host, size_t size)
511         {
512                 if(const_mem_map.find(name) == const_mem_map.end()) {
513                         device_vector<uchar> *data = new device_vector<uchar>();
514                         data->copy((uchar*)host, size);
515
516                         mem_alloc(*data, MEM_READ_ONLY);
517                         const_mem_map[name] = data;
518                 }
519                 else {
520                         device_vector<uchar> *data = const_mem_map[name];
521                         data->copy((uchar*)host, size);
522                 }
523
524                 mem_copy_to(*const_mem_map[name]);
525         }
526
527         void tex_alloc(const char *name, device_memory& mem, bool interpolation, bool periodic)
528         {
529                 mem_alloc(mem, MEM_READ_ONLY);
530                 mem_copy_to(mem);
531                 mem_map[name] = &mem;
532         }
533
534         void tex_free(device_memory& mem)
535         {
536                 if(mem.data_pointer)
537                         mem_free(mem);
538         }
539
540         size_t global_size_round_up(int group_size, int global_size)
541         {
542                 int r = global_size % group_size;
543                 return global_size + ((r == 0)? 0: group_size - r);
544         }
545
546         void path_trace(DeviceTask& task)
547         {
548                 /* cast arguments to cl types */
549                 cl_mem d_data = CL_MEM_PTR(const_mem_map["__data"]->device_pointer);
550                 cl_mem d_buffer = CL_MEM_PTR(task.buffer);
551                 cl_mem d_rng_state = CL_MEM_PTR(task.rng_state);
552                 cl_int d_x = task.x;
553                 cl_int d_y = task.y;
554                 cl_int d_w = task.w;
555                 cl_int d_h = task.h;
556                 cl_int d_sample = task.sample;
557                 cl_int d_offset = task.offset;
558                 cl_int d_stride = task.stride;
559
560                 /* sample arguments */
561                 int narg = 0;
562                 ciErr = 0;
563
564                 ciErr |= clSetKernelArg(ckPathTraceKernel, narg++, sizeof(d_data), (void*)&d_data);
565                 ciErr |= clSetKernelArg(ckPathTraceKernel, narg++, sizeof(d_buffer), (void*)&d_buffer);
566                 ciErr |= clSetKernelArg(ckPathTraceKernel, narg++, sizeof(d_rng_state), (void*)&d_rng_state);
567
568 #define KERNEL_TEX(type, ttype, name) \
569         ciErr |= set_kernel_arg_mem(ckPathTraceKernel, &narg, #name);
570 #include "kernel_textures.h"
571
572                 ciErr |= clSetKernelArg(ckPathTraceKernel, narg++, sizeof(d_sample), (void*)&d_sample);
573                 ciErr |= clSetKernelArg(ckPathTraceKernel, narg++, sizeof(d_x), (void*)&d_x);
574                 ciErr |= clSetKernelArg(ckPathTraceKernel, narg++, sizeof(d_y), (void*)&d_y);
575                 ciErr |= clSetKernelArg(ckPathTraceKernel, narg++, sizeof(d_w), (void*)&d_w);
576                 ciErr |= clSetKernelArg(ckPathTraceKernel, narg++, sizeof(d_h), (void*)&d_h);
577                 ciErr |= clSetKernelArg(ckPathTraceKernel, narg++, sizeof(d_offset), (void*)&d_offset);
578                 ciErr |= clSetKernelArg(ckPathTraceKernel, narg++, sizeof(d_stride), (void*)&d_stride);
579
580                 opencl_assert(ciErr);
581
582                 size_t workgroup_size;
583
584                 clGetKernelWorkGroupInfo(ckPathTraceKernel, cdDevice,
585                         CL_KERNEL_WORK_GROUP_SIZE, sizeof(size_t), &workgroup_size, NULL);
586         
587                 workgroup_size = max(sqrt((double)workgroup_size), 1.0);
588
589                 size_t local_size[2] = {workgroup_size, workgroup_size};
590                 size_t global_size[2] = {global_size_round_up(local_size[0], d_w), global_size_round_up(local_size[1], d_h)};
591
592                 /* run kernel */
593                 ciErr = clEnqueueNDRangeKernel(cqCommandQueue, ckPathTraceKernel, 2, NULL, global_size, local_size, 0, NULL, NULL);
594                 opencl_assert(ciErr);
595                 opencl_assert(clFinish(cqCommandQueue));
596         }
597
598         cl_int set_kernel_arg_mem(cl_kernel kernel, int *narg, const char *name)
599         {
600                 cl_mem ptr;
601                 cl_int err = 0;
602
603                 if(mem_map.find(name) != mem_map.end()) {
604                         device_memory *mem = mem_map[name];
605                 
606                         ptr = CL_MEM_PTR(mem->device_pointer);
607                 }
608                 else {
609                         /* work around NULL not working, even though the spec says otherwise */
610                         ptr = CL_MEM_PTR(null_mem);
611                 }
612                 
613                 err |= clSetKernelArg(kernel, (*narg)++, sizeof(ptr), (void*)&ptr);
614                 opencl_assert(err);
615
616                 return err;
617         }
618
619         void tonemap(DeviceTask& task)
620         {
621                 /* cast arguments to cl types */
622                 cl_mem d_data = CL_MEM_PTR(const_mem_map["__data"]->device_pointer);
623                 cl_mem d_rgba = CL_MEM_PTR(task.rgba);
624                 cl_mem d_buffer = CL_MEM_PTR(task.buffer);
625                 cl_int d_x = task.x;
626                 cl_int d_y = task.y;
627                 cl_int d_w = task.w;
628                 cl_int d_h = task.h;
629                 cl_int d_sample = task.sample;
630                 cl_int d_resolution = task.resolution;
631                 cl_int d_offset = task.offset;
632                 cl_int d_stride = task.stride;
633
634                 /* sample arguments */
635                 int narg = 0;
636                 ciErr = 0;
637
638                 ciErr |= clSetKernelArg(ckFilmConvertKernel, narg++, sizeof(d_data), (void*)&d_data);
639                 ciErr |= clSetKernelArg(ckFilmConvertKernel, narg++, sizeof(d_rgba), (void*)&d_rgba);
640                 ciErr |= clSetKernelArg(ckFilmConvertKernel, narg++, sizeof(d_buffer), (void*)&d_buffer);
641
642 #define KERNEL_TEX(type, ttype, name) \
643         ciErr |= set_kernel_arg_mem(ckFilmConvertKernel, &narg, #name);
644 #include "kernel_textures.h"
645
646                 ciErr |= clSetKernelArg(ckFilmConvertKernel, narg++, sizeof(d_sample), (void*)&d_sample);
647                 ciErr |= clSetKernelArg(ckFilmConvertKernel, narg++, sizeof(d_resolution), (void*)&d_resolution);
648                 ciErr |= clSetKernelArg(ckFilmConvertKernel, narg++, sizeof(d_x), (void*)&d_x);
649                 ciErr |= clSetKernelArg(ckFilmConvertKernel, narg++, sizeof(d_y), (void*)&d_y);
650                 ciErr |= clSetKernelArg(ckFilmConvertKernel, narg++, sizeof(d_w), (void*)&d_w);
651                 ciErr |= clSetKernelArg(ckFilmConvertKernel, narg++, sizeof(d_h), (void*)&d_h);
652                 ciErr |= clSetKernelArg(ckFilmConvertKernel, narg++, sizeof(d_offset), (void*)&d_offset);
653                 ciErr |= clSetKernelArg(ckFilmConvertKernel, narg++, sizeof(d_stride), (void*)&d_stride);
654
655                 opencl_assert(ciErr);
656
657                 size_t workgroup_size;
658
659                 clGetKernelWorkGroupInfo(ckFilmConvertKernel, cdDevice,
660                         CL_KERNEL_WORK_GROUP_SIZE, sizeof(size_t), &workgroup_size, NULL);
661         
662                 workgroup_size = max(sqrt((double)workgroup_size), 1.0);
663
664                 size_t local_size[2] = {workgroup_size, workgroup_size};
665                 size_t global_size[2] = {global_size_round_up(local_size[0], d_w), global_size_round_up(local_size[1], d_h)};
666
667                 /* run kernel */
668                 ciErr = clEnqueueNDRangeKernel(cqCommandQueue, ckFilmConvertKernel, 2, NULL, global_size, local_size, 0, NULL, NULL);
669                 opencl_assert(ciErr);
670                 opencl_assert(clFinish(cqCommandQueue));
671         }
672
673         void task_add(DeviceTask& maintask)
674         {
675                 list<DeviceTask> tasks;
676
677                 /* arbitrary limit to work around apple ATI opencl issue */
678                 if(platform_name == "Apple")
679                         maintask.split_max_size(tasks, 76800);
680                 else
681                         tasks.push_back(maintask);
682
683                 foreach(DeviceTask& task, tasks) {
684                         if(task.type == DeviceTask::TONEMAP)
685                                 tonemap(task);
686                         else if(task.type == DeviceTask::PATH_TRACE)
687                                 path_trace(task);
688                 }
689         }
690
691         void task_wait()
692         {
693         }
694
695         void task_cancel()
696         {
697         }
698 };
699
700 Device *device_opencl_create(DeviceInfo& info, bool background)
701 {
702         return new OpenCLDevice(info, background);
703 }
704
705 void device_opencl_info(vector<DeviceInfo>& devices)
706 {
707         vector<cl_device_id> device_ids;
708         cl_uint num_devices;
709         cl_platform_id platform_id;
710         cl_uint num_platforms;
711
712         /* get devices */
713         if(clGetPlatformIDs(0, NULL, &num_platforms) != CL_SUCCESS || num_platforms == 0)
714                 return;
715
716         if(clGetPlatformIDs(1, &platform_id, NULL) != CL_SUCCESS)
717                 return;
718
719         if(clGetDeviceIDs(platform_id, CL_DEVICE_TYPE_GPU|CL_DEVICE_TYPE_ACCELERATOR, 0, NULL, &num_devices) != CL_SUCCESS)
720                 return;
721         
722         device_ids.resize(num_devices);
723
724         if(clGetDeviceIDs(platform_id, CL_DEVICE_TYPE_GPU|CL_DEVICE_TYPE_ACCELERATOR, num_devices, &device_ids[0], NULL) != CL_SUCCESS)
725                 return;
726         
727         /* add devices */
728         for(int num = 0; num < num_devices; num++) {
729                 cl_device_id device_id = device_ids[num];
730                 char name[1024];
731
732                 if(clGetDeviceInfo(device_id, CL_DEVICE_NAME, sizeof(name), &name, NULL) != CL_SUCCESS)
733                         continue;
734
735                 DeviceInfo info;
736
737                 info.type = DEVICE_OPENCL;
738                 info.description = string(name);
739                 info.id = string_printf("OPENCL_%d", num);
740                 info.num = num;
741                 /* we don't know if it's used for display, but assume it is */
742                 info.display_device = true;
743                 info.advanced_shading = false;
744                 info.pack_images = true;
745
746                 devices.push_back(info);
747         }
748 }
749
750 CCL_NAMESPACE_END
751
752 #endif /* WITH_OPENCL */
753