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| 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; |
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215 | |
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216 | =head2 Use the OpenGL module to share a texture between OpenCL and OpenGL and draw some julia |
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217 | set tunnel effect. |
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218 | |
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219 | This is quite a long example to get you going. |
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220 | |
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221 | use OpenGL ":all"; |
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222 | use OpenCL; |
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223 | |
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224 | # open a window and create a gl texture |
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225 | OpenGL::glpOpenWindow width => 256, height => 256; |
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226 | my $texid = glGenTextures_p 1; |
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227 | glBindTexture GL_TEXTURE_2D, $texid; |
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228 | glTexImage2D_c GL_TEXTURE_2D, 0, GL_RGBA8, 256, 256, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0; |
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229 | |
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230 | # find and use the first opencl device that let's us get a shared opengl context |
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231 | my $platform; |
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232 | my $dev; |
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233 | my $ctx; |
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234 | |
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235 | for (OpenCL::platforms) { |
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236 | $platform = $_; |
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237 | for ($platform->devices) { |
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238 | $dev = $_; |
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239 | $ctx = $platform->context ([OpenCL::GLX_DISPLAY_KHR, undef, OpenCL::GL_CONTEXT_KHR, undef], [$dev]) |
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240 | and last; |
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241 | } |
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242 | } |
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243 | |
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244 | $ctx |
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245 | or die "cannot find suitable OpenCL device\n"; |
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246 | |
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247 | my $queue = $ctx->queue ($dev); |
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248 | |
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249 | # now attach an opencl image2d object to the opengl texture |
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250 | my $tex = $ctx->gl_texture2d (OpenCL::MEM_WRITE_ONLY, GL_TEXTURE_2D, 0, $texid); |
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251 | |
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252 | # now the boring opencl code |
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253 | my $src = <<EOF; |
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254 | kernel void |
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255 | juliatunnel (write_only image2d_t img, float time) |
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256 | { |
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257 | float2 p = (float2)(get_global_id (0), get_global_id (1)) / 256.f * 2.f - 1.f; |
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258 | |
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259 | float2 m = (float2)(1.f, p.y) / fabs (p.x); |
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260 | m.x = fabs (fmod (m.x + time * 0.05f, 4.f)) - 2.f; |
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261 | |
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262 | float2 z = m; |
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263 | float2 c = (float2)(sin (time * 0.05005), cos (time * 0.06001)); |
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264 | |
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265 | for (int i = 0; i < 100 && dot (z, z) < 4.f; ++i) |
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266 | z = (float2)(z.x * z.x - z.y * z.y, 2.f * z.x * z.y) + c; |
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267 | |
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268 | float3 colour = (float3)(z.x, z.y, z.x * z.y); |
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269 | write_imagef (img, (int2)(get_global_id (0), get_global_id (1)), (float4)(colour * p.x * p.x, 1.)); |
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270 | } |
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271 | EOF |
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272 | my $prog = $ctx->program_with_source ($src); |
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273 | eval { $prog->build ($dev); 1 } |
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274 | or die $prog->build_log ($dev); |
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275 | |
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276 | my $kernel = $prog->kernel ("juliatunnel"); |
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277 | |
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278 | # program compiled, kernel ready, now draw and loop |
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279 | |
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280 | for (my $time; ; ++$time) { |
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281 | # acquire objects from opengl |
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282 | $queue->enqueue_acquire_gl_objects ([$tex]); |
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283 | |
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284 | # configure and run our kernel |
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285 | $kernel->set_image2d (0, $tex); |
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286 | $kernel->set_float (1, $time); |
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287 | $queue->enqueue_nd_range_kernel ($kernel, undef, [256, 256], undef); |
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288 | |
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289 | # release objects to opengl again |
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290 | $queue->enqueue_release_gl_objects ([$tex]); |
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291 | |
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292 | # wait |
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293 | $queue->flush; |
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294 | |
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295 | # now draw the texture, the defaults should be all right |
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296 | glTexParameterf GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST; |
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297 | |
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298 | glEnable GL_TEXTURE_2D; |
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299 | glBegin GL_QUADS; |
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300 | glTexCoord2f 0, 1; glVertex3i -1, -1, -1; |
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301 | glTexCoord2f 0, 0; glVertex3i 1, -1, -1; |
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302 | glTexCoord2f 1, 0; glVertex3i 1, 1, -1; |
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303 | glTexCoord2f 1, 1; glVertex3i -1, 1, -1; |
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304 | glEnd; |
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305 | |
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306 | glXSwapBuffers; |
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307 | |
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308 | select undef, undef, undef, 1/60; |
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309 | } |
| 215 | |
310 | |
| 216 | =head1 DOCUMENTATION |
311 | =head1 DOCUMENTATION |
| 217 | |
312 | |
| 218 | =head2 BASIC CONVENTIONS |
313 | =head2 BASIC CONVENTIONS |
| 219 | |
314 | |
| … | |
… | |
| 275 | |
370 | |
| 276 | =head2 GLX SUPPORT |
371 | =head2 GLX SUPPORT |
| 277 | |
372 | |
| 278 | Due to the sad state that OpenGL support is in in Perl (mostly the OpenGL |
373 | Due to the sad state that OpenGL support is in in Perl (mostly the OpenGL |
| 279 | module, which has little to no documentation and has little to no support |
374 | module, which has little to no documentation and has little to no support |
| 280 | for glx), this module, as a special extension, treats context creation |
375 | for glX), this module, as a special extension, treats context creation |
| 281 | properties C<OpenCL::GLX_DISPLAY_KHR> and C<OpenCL::GL_CONTEXT_KHR> |
376 | properties C<OpenCL::GLX_DISPLAY_KHR> and C<OpenCL::GL_CONTEXT_KHR> |
| 282 | specially: If either or both of these are C<undef>, then the OpenCL |
377 | specially: If either or both of these are C<undef>, then the OpenCL |
| 283 | module tries to dynamically resolve C<glxGetCurrentDisplay> and |
378 | module tries to dynamically resolve C<glXGetCurrentDisplay> and |
| 284 | C<glxGetCurrentContext>, call these functions and use their return values |
379 | C<glXGetCurrentContext>, call these functions and use their return values |
| 285 | instead. |
380 | instead. |
| 286 | |
381 | |
| 287 | For this to work, the OpenGL library must be loaded, a GLX context must |
382 | For this to work, the OpenGL library must be loaded, a GLX context must |
| 288 | have been created and be made current, and C<dlsym> must be available and |
383 | have been created and be made current, and C<dlsym> must be available and |
| 289 | capable of finding the function via C<RTLD_DEFAULT>. |
384 | capable of finding the function via C<RTLD_DEFAULT>. |
| … | |
… | |
| 1378 | package OpenCL; |
1473 | package OpenCL; |
| 1379 | |
1474 | |
| 1380 | use common::sense; |
1475 | use common::sense; |
| 1381 | |
1476 | |
| 1382 | BEGIN { |
1477 | BEGIN { |
| 1383 | our $VERSION = '0.92'; |
1478 | our $VERSION = '0.95'; |
| 1384 | |
1479 | |
| 1385 | require XSLoader; |
1480 | require XSLoader; |
| 1386 | XSLoader::load (__PACKAGE__, $VERSION); |
1481 | XSLoader::load (__PACKAGE__, $VERSION); |
| 1387 | |
1482 | |
| 1388 | @OpenCL::Buffer::ISA = |
1483 | @OpenCL::Buffer::ISA = |
