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Comparing OpenCL/OpenCL.pm (file contents):
Revision 1.35 by root, Thu Apr 19 13:18:31 2012 UTC vs.
Revision 1.43 by root, Fri Apr 20 20:24:20 2012 UTC

… …
160 '; 160 ';
161 161
162 my $prog = $ctx->program_with_source ($src); 162 my $prog = $ctx->program_with_source ($src);
163 163
164 # build croaks on compile errors, so catch it and print the compile errors 164 # build croaks on compile errors, so catch it and print the compile errors
165 eval { $prog->build ($dev); 1 } 165 eval { $prog->build ($dev, "-cl-fast-relaxed-math"); 1 }
166 or die $prog->build_log; 166 or die $prog->build_log;
167 167
168 my $kernel = $prog->kernel ("squareit"); 168 my $kernel = $prog->kernel ("squareit");
169 169
170=head2 Create some input and output float buffers, then call the 170=head2 Create some input and output float buffers, then call the
… …
210 # enqueue an async read 210 # enqueue an async read
211 $ev = $queue->enqueue_read_buffer ($output, 0, 0, OpenCL::SIZEOF_FLOAT * 4, my $data, $ev); 211 $ev = $queue->enqueue_read_buffer ($output, 0, 0, OpenCL::SIZEOF_FLOAT * 4, my $data, $ev);
212 212
213 # wait for the last event to complete 213 # wait for the last event to complete
214 $ev->wait; 214 $ev->wait;
215
216=head2 Use the OpenGL module to share a texture between OpenCL and OpenGL and draw some julia
217set tunnel effect.
218
219This is quite a long example to get you going.
220
221 use OpenGL ":all";
222 use OpenCL;
223
224 # open a window and create a gl texture
225 OpenGL::glpOpenWindow width => 256, height => 256;
226 my $texid = glGenTextures_p 1;
227 glBindTexture GL_TEXTURE_2D, $texid;
228 glTexImage2D_c GL_TEXTURE_2D, 0, GL_RGBA8, 256, 256, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0;
229
230 # find and use the first opencl device that let's us get a shared opengl context
231 my $platform;
232 my $dev;
233 my $ctx;
234
235 for (OpenCL::platforms) {
236 $platform = $_;
237 for ($platform->devices) {
238 $dev = $_;
239 $ctx = $platform->context ([OpenCL::GLX_DISPLAY_KHR, undef, OpenCL::GL_CONTEXT_KHR, undef], [$dev])
240 and last;
241 }
242 }
243
244 $ctx
245 or die "cannot find suitable OpenCL device\n";
246
247 my $queue = $ctx->queue ($dev);
248
249 # now attach an opencl image2d object to the opengl texture
250 my $tex = $ctx->gl_texture2d (OpenCL::MEM_WRITE_ONLY, GL_TEXTURE_2D, 0, $texid);
251
252 # now the boring opencl code
253 my $src = <<EOF;
254 kernel void
255 juliatunnel (write_only image2d_t img, float time)
256 {
257 float2 p = (float2)(get_global_id (0), get_global_id (1)) / 256.f * 2.f - 1.f;
258
259 float2 m = (float2)(1.f, p.y) / fabs (p.x);
260 m.x = fabs (fmod (m.x + time * 0.05f, 4.f)) - 2.f;
261
262 float2 z = m;
263 float2 c = (float2)(sin (time * 0.05005), cos (time * 0.06001));
264
265 for (int i = 0; i < 25 && dot (z, z) < 4.f; ++i)
266 z = (float2)(z.x * z.x - z.y * z.y, 2.f * z.x * z.y) + c;
267
268 float3 colour = (float3)(z.x, z.y, z.x * z.y);
269 write_imagef (img, (int2)(get_global_id (0), get_global_id (1)), (float4)(colour * p.x * p.x, 1.));
270 }
271 EOF
272 my $prog = $ctx->program_with_source ($src);
273 eval { $prog->build ($dev); 1 }
274 or die $prog->build_log ($dev);
275
276 my $kernel = $prog->kernel ("juliatunnel");
277
278 # program compiled, kernel ready, now draw and loop
279
280 for (my $time; ; ++$time) {
281 # acquire objects from opengl
282 $queue->enqueue_acquire_gl_objects ([$tex]);
283
284 # configure and run our kernel
285 $kernel->set_image2d (0, $tex);
286 $kernel->set_float (1, $time);
287 $queue->enqueue_nd_range_kernel ($kernel, undef, [256, 256], undef);
288
289 # release objects to opengl again
290 $queue->enqueue_release_gl_objects ([$tex]);
291
292 # wait
293 $queue->finish;
294
295 # now draw the texture, the defaults should be all right
296 glTexParameterf GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST;
297
298 glEnable GL_TEXTURE_2D;
299 glBegin GL_QUADS;
300 glTexCoord2f 0, 1; glVertex3i -1, -1, -1;
301 glTexCoord2f 0, 0; glVertex3i 1, -1, -1;
302 glTexCoord2f 1, 0; glVertex3i 1, 1, -1;
303 glTexCoord2f 1, 1; glVertex3i -1, 1, -1;
304 glEnd;
305
306 glXSwapBuffers;
307
308 select undef, undef, undef, 1/60;
309 }
215 310
216=head1 DOCUMENTATION 311=head1 DOCUMENTATION
217 312
218=head2 BASIC CONVENTIONS 313=head2 BASIC CONVENTIONS
219 314
… …
271 ulong IV - Q 366 ulong IV - Q
272 float NV float f 367 float NV float f
273 half IV ushort S 368 half IV ushort S
274 double NV double d 369 double NV double d
275 370
371=head2 GLX SUPPORT
372
373Due to the sad state that OpenGL support is in in Perl (mostly the OpenGL
374module, which has little to no documentation and has little to no support
375for glX), this module, as a special extension, treats context creation
376properties C<OpenCL::GLX_DISPLAY_KHR> and C<OpenCL::GL_CONTEXT_KHR>
377specially: If either or both of these are C<undef>, then the OpenCL
378module tries to dynamically resolve C<glXGetCurrentDisplay> and
379C<glXGetCurrentContext>, call these functions and use their return values
380instead.
381
382For this to work, the OpenGL library must be loaded, a GLX context must
383have been created and be made current, and C<dlsym> must be available and
384capable of finding the function via C<RTLD_DEFAULT>.
385
276=head2 THE OpenCL PACKAGE 386=head2 THE OpenCL PACKAGE
277 387
278=over 4 388=over 4
279 389
280=item $int = OpenCL::errno 390=item $int = OpenCL::errno
… …
1053 1163
1054=for gengetinfo begin gl_texture 1164=for gengetinfo begin gl_texture
1055 1165
1056=item $GLenum = $gl_texture->target 1166=item $GLenum = $gl_texture->target
1057 1167
1058Calls C<clGetGlTextureInfo> with C<CL_GL_TEXTURE_TARGET> and returns the result. 1168Calls C<clGetGLTextureInfo> with C<CL_GL_TEXTURE_TARGET> and returns the result.
1059 1169
1060=item $GLint = $gl_texture->gl_mipmap_level 1170=item $GLint = $gl_texture->gl_mipmap_level
1061 1171
1062Calls C<clGetGlTextureInfo> with C<CL_GL_MIPMAP_LEVEL> and returns the result. 1172Calls C<clGetGLTextureInfo> with C<CL_GL_MIPMAP_LEVEL> and returns the result.
1063 1173
1064=for gengetinfo end gl_texture 1174=for gengetinfo end gl_texture
1065 1175
1066=back 1176=back
1067 1177
… …
1259 1369
1260This is a family of methods to set the kernel argument with the number C<$index> to the give C<$value>. 1370This is a family of methods to set the kernel argument with the number C<$index> to the give C<$value>.
1261 1371
1262TYPE is one of C<char>, C<uchar>, C<short>, C<ushort>, C<int>, C<uint>, 1372TYPE is one of C<char>, C<uchar>, C<short>, C<ushort>, C<int>, C<uint>,
1263C<long>, C<ulong>, C<half>, C<float>, C<double>, C<memory>, C<buffer>, 1373C<long>, C<ulong>, C<half>, C<float>, C<double>, C<memory>, C<buffer>,
1264C<image2d>, C<image3d>, C<sampler> or C<event>. 1374C<image2d>, C<image3d>, C<sampler>, C<local> or C<event>.
1265 1375
1266Chars and integers (including the half type) are specified as integers, 1376Chars and integers (including the half type) are specified as integers,
1267float and double as floating point values, memory/buffer/image2d/image3d 1377float and double as floating point values, memory/buffer/image2d/image3d
1268must be an object of that type or C<undef>, and sampler and event must be 1378must be an object of that type or C<undef>, local-memory arguments are
1269objects of that type. 1379set by specifying the size, and sampler and event must be objects of that
1380type.
1270 1381
1271L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clSetKernelArg.html> 1382L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clSetKernelArg.html>
1272 1383
1273=back 1384=back
1274 1385
… …
1363package OpenCL; 1474package OpenCL;
1364 1475
1365use common::sense; 1476use common::sense;
1366 1477
1367BEGIN { 1478BEGIN {
1368 our $VERSION = '0.92'; 1479 our $VERSION = '0.96';
1369 1480
1370 require XSLoader; 1481 require XSLoader;
1371 XSLoader::load (__PACKAGE__, $VERSION); 1482 XSLoader::load (__PACKAGE__, $VERSION);
1372 1483
1373 @OpenCL::Buffer::ISA = 1484 @OpenCL::Buffer::ISA =

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