| <!DOCTYPE html> |
| <html> |
| <head> |
| <script src="../../../resources/js-test-pre.js"></script> |
| </head> |
| <body> |
| <canvas id="canvas" width="40" height="40"></canvas> |
| <script> |
| description("Make sure that reading from WebGL2 buffers into offset ArrayBufferView works as expected."); |
| |
| var arrayBuffer = new ArrayBuffer(40); |
| var fullArrayView = new Float32Array(arrayBuffer); // [15, 16, 17, 18, 19, 20, 21, 22, 23, 24], 40 bytes |
| |
| var receiverBuffer = new ArrayBuffer(1024); |
| var receiver = new Float32Array(receiverBuffer, 40, 20); // 20 floats, 80 bytes |
| for (var i = 0; i < 10; ++i) |
| fullArrayView[i] = 15 + i; |
| |
| var sentinel = 100; |
| function fillReceiver() { |
| var filler = new Float32Array(receiverBuffer); |
| filler.fill(sentinel); |
| } |
| |
| var canvas = document.getElementById("canvas"); |
| var context = canvas.getContext("webgl2"); |
| |
| runTests(context.ARRAY_BUFFER); |
| runTests(context.COPY_READ_BUFFER); |
| runTests(context.COPY_WRITE_BUFFER); |
| runTests(context.ELEMENT_ARRAY_BUFFER); |
| runTests(context.PIXEL_PACK_BUFFER); |
| runTests(context.PIXEL_UNPACK_BUFFER); |
| runTests(context.TRANSFORM_FEEDBACK_BUFFER); |
| runTests(context.UNIFORM_BUFFER); |
| |
| function runTests(target) { |
| var buffer = context.createBuffer(); |
| shouldBe("context.getError()", "context.NO_ERROR"); |
| context.bindBuffer(target, buffer); |
| shouldBe("context.getError()", "context.NO_ERROR"); |
| context.bufferData(target, arrayBuffer, context.STATIC_DRAW); |
| shouldBe("context.getError()", "context.NO_ERROR"); |
| |
| fillReceiver(); |
| context.getBufferSubData(target, 0, receiver, 0, 10); |
| shouldBe("context.getError()", "context.NO_ERROR"); |
| for (var i = 0; i < 10; ++i) |
| shouldBe("receiver[" + i + "]", "fullArrayView[" + i + "]"); |
| |
| fillReceiver(); |
| context.getBufferSubData(target, 0, receiver, 1, 10); |
| shouldBe("context.getError()", "context.NO_ERROR"); |
| shouldBe("receiver[0]", "sentinel"); |
| for (var i = 0; i < 10; ++i) |
| shouldBe("receiver[" + (i + 1) + "]", "fullArrayView[" + i + "]"); |
| |
| fillReceiver(); |
| context.getBufferSubData(target, 4, receiver, 0, 9); |
| shouldBe("context.getError()", "context.NO_ERROR"); |
| for (var i = 0; i < 9; ++i) |
| shouldBe("receiver[" + i + "]", "fullArrayView[" + (i + 1) + "]"); |
| |
| fillReceiver(); |
| context.getBufferSubData(target, 8, receiver, 1, 8); |
| shouldBe("context.getError()", "context.NO_ERROR"); |
| shouldBe("receiver[0]", "sentinel"); |
| for (var i = 0; i < 8; ++i) |
| shouldBe("receiver[" + (i + 1) + "]", "fullArrayView[" + (i + 2) + "]"); |
| |
| context.deleteBuffer(buffer); |
| shouldBe("context.getError()", "context.NO_ERROR"); |
| } |
| </script> |
| <script src="../../../resources/js-test-post.js"></script> |
| </body> |
| </html> |
