| 1 | <!DOCTYPE html>
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| 2 | <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="de" lang="de">
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| 3 | <head>
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| 4 | <title>WebCL Beispiel 3</title>
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| 5 | <script type="text/javascript" id="addVectors">
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| 6 | "use strict";
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| 7 | /*global window */ // tells jslint that 'window' is defined!
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| 8 | /*global Uint32Array */
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| 9 | /*global WebCL */
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| 10 | var kernelsource = '__kernel void ckVectorAdd(\n\
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| 11 | __global unsigned int* vectorIn1,\n\
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| 12 | __global unsigned int* vectorIn2,\n\
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| 13 | __global unsigned int* vectorOut,\n\
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| 14 | unsigned int uiVectorWidth) {\n\
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| 15 | unsigned int x = get_global_id(0);\n\
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| 16 | if (x >= (uiVectorWidth))\n\
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| 17 | {\n\
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| 18 | return;\n\
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| 19 | }\n\
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| 20 | \n\
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| 21 | // Addition der zwei Vektorelemente:\n\
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| 22 | vectorOut[x] = vectorIn1[x] + vectorIn2[x];\n\
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| 23 | }';
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| 24 | function addVectors() {
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| 25 | var
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| 26 | outputstring,
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| 27 | output,
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| 28 | vectorLength,
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| 29 | UIvector1,
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| 30 | UIvector2,
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| 31 | platforms,
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| 32 | ctx,
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| 33 | i,
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| 34 | bufSize,
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| 35 | bufIn1,
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| 36 | bufIn2,
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| 37 | bufOut,
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| 38 | program,
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| 39 | devices,
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| 40 | kernel,
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| 41 | cmdQueue,
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| 42 | outBuffer,
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| 43 | dataObject1,
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| 44 | dataObject2,
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| 45 | localWS,
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| 46 | globalWS,
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| 47 | utils,
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| 48 | k;
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| 49 | outputstring = "";
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| 50 | output = window.document.getElementById("output");
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| 51 | try {
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| 52 | if (window.WebCL === undefined) {
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| 53 | |
| 54 | return false;
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| 55 | }
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| 56 |
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| 57 | // Generate input vectors
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| 58 | vectorLength = 20;
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| 59 | UIvector1 = new Uint32Array(vectorLength);
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| 60 | UIvector2 = new Uint32Array(vectorLength);
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| 61 | for (i = 0; i < vectorLength; i = i + 1) {
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| 62 | UIvector1[i] = Math.floor(Math.random() * 100); //Zufallszahl 0..99
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| 63 | UIvector2[i] = Math.floor(Math.random() * 100); //Zufallszahl 0..99
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| 64 | }
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| 65 |
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| 66 | |
| 67 | |
| 68 | platforms = WebCL.getPlatformIDs();
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| 69 | ctx = WebCL.createContextFromType([WebCL.CL_CONTEXT_PLATFORM,
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| 70 | platforms[0]],
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| 71 | WebCL.CL_DEVICE_TYPE_DEFAULT);
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| 72 | |
| 73 | output.innerHTML += "<br>Buffer size: " + bufSize + " bytes";
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| 74 | bufIn1 = ctx.createBuffer(WebCL.CL_MEM_READ_ONLY, bufSize);
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| 75 | bufIn2 = ctx.createBuffer(WebCL.CL_MEM_READ_ONLY, bufSize);
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| 76 | bufOut = ctx.createBuffer(WebCL.CL_MEM_WRITE_ONLY, bufSize);
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| 77 |
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| 78 | program = ctx.createProgramWithSource(kernelsource);
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| 79 | devices = ctx.getContextInfo(WebCL.CL_CONTEXT_DEVICES);
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| 80 |
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| 81 | try {
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| 82 | program.buildProgram([devices[0]], "");
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| 83 | } catch (e1) {
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| 84 | window.alert("Failed to build WebCL program. Error "
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| 85 | + program.getProgramBuildInfo(devices[0], WebCL.CL_PROGRAM_BUILD_STATUS) + ": "
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| 86 | + program.getProgramBuildInfo(devices[0], WebCL.CL_PROGRAM_BUILD_LOG));
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| 87 | throw e1;
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| 88 | }
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| 89 |
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| 90 | // Create kernel and set arguments
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| 91 | kernel = program.createKernel("ckVectorAdd");
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| 92 | kernel.setKernelArg(0, bufIn1);
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| 93 | kernel.setKernelArg(1, bufIn2);
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| 94 | kernel.setKernelArg(2, bufOut);
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| 95 | kernel.setKernelArg(3, vectorLength, WebCL.types.UINT);
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| 96 | // Create command queue using the first available device
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| 97 | cmdQueue = ctx.createCommandQueue(devices[0], 0);
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| 98 |
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| 99 | // Write the buffer to OpenCL device memory
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| 100 | dataObject1 = WebCL.createDataObject();
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| 101 | dataObject1.allocate(bufSize);
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| 102 | dataObject1.set(UIvector1);
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| 103 |
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| 104 | dataObject2 = WebCL.createDataObject();
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| 105 | dataObject2.allocate(bufSize);
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| 106 | dataObject2.set(UIvector2);
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| 107 |
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| 108 | cmdQueue.enqueueWriteBuffer(bufIn1, false, 0, dataObject1.length,
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| 109 | dataObject1, []);
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| 110 | cmdQueue.enqueueWriteBuffer(bufIn2, false, 0, dataObject2.length,
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| 111 | dataObject2, []);
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| 112 |
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| 113 | // Init ND-range
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| 114 | localWS = [8];
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| 115 | globalWS = [Math.ceil(vectorLength / localWS) * localWS];
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| 116 |
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| 117 |
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| 118 | // Execute (enqueue) kernel
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| 119 | cmdQueue.enqueueNDRangeKernel(kernel, globalWS.length, [],
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| 120 | globalWS, localWS, []);
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| 121 |
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| 122 | // Read the result buffer from OpenCL device
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| 123 | cmdQueue.enqueueReadBuffer(bufOut, false, 0, bufSize, dataObject1, []);
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| 124 | cmdQueue.finish(); //Finish all the operations
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| 125 |
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| 126 | outBuffer = new Uint32Array(vectorLength);
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| 127 | utils = WebCL.getUtils();
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| 128 | utils.writeDataObjectToTypedArray(dataObject1, outBuffer);
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| 129 |
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| 130 | for (k = 0; k < outBuffer.length; k = k + 1) {
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| 131 | outputstring += UIvector1[k] + " + " + UIvector2[k] + " = " + outBuffer[k] + "<br \/>";
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| 132 | }
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| 133 |
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| 134 | output.innerHTML = outputstring + "<br \/>";
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| 135 | } catch (e0) {
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| 136 | output.innerHTML = outputstring + "<br \/>";
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| 137 | output.innerHTML += "<b>Error:<\/b> <pre style='color:red;'>" + e0.toString() + "<\/pre>";
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| 138 | throw e0;
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| 139 | }
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| 140 | }
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