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Strange output on Array3D(3) toArray()

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#622 2 bình luận 0 reaction 0 người được giao Xem trên GitHub

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Đánh giá

Độ khó
4/5
Thời gian dự kiến
3-5 ngày
Mức phù hợp với người mới
35/100
Loại issue
Lỗi
Độ rõ ràng
Khá rõ ràng
Mức độ hoạt động
Đình trệ
Công nghệ
javascript, node.js
Lĩnh vực
computer-graphics

Hướng nghiên cứu

Bắt đầu với đường đi của các đối số createKernel(...), Array3D(3) và bufferTex.toArray() bằng reproduction 8×8×8 được cung cấp trên Node.js/headlessgl. So sánh buffer CPU với mảng texture được trả về và lần theo quá trình đọc ngược texture GPU cũng như ánh xạ chỉ mục; được xem là hoàn tất khi toArray() giữ nguyên các giá trị đầu vào hoặc áp dụng một ánh xạ nhất quán.

Do mô hình lập chỉ mục viết ra từ nội dung của issue.

Mô tả

What is wrong?

When using a kernel to draw a CPU Array3D(3) into a texture and then converted back using toArray(), the resulting array is very strange and wrong, with some values being correct and others being either duplicated or entirely incorrect.

Where does it happen?

In GPU.js, running on my Windows 7 PC, headlessgl in node.js v12.18.1.

How do we replicate the issue?

Create a 3D array and assign each value set to its index in the array...
e.g.,

const gridSize = 8;
const buffer = [];
for (let x = 0; x < gridSize; x++) {
  let currXArr = [];
  buffer.push(currXArr);
  for (let y = 0; y < gridSize; y++) {
    let currYArr = [];
    currXArr.push(currYArr);
    for (let z = 0; z < gridSize; z++) {
      currYArr.push(new Float32Array([x,y,z]));
    }
  }
}

Build the following kernel:

const pipelineFuncSettings = {
  output: [gridSize, gridSize, gridSize],
  pipeline: true,
  returnType: 'Array(3)',
};
const copyFramebufferFuncImmutable = gpu.createKernel(function(framebufTex) {
  const voxelColour = framebufTex[this.thread.x][this.thread.y][this.thread.z];
  return [voxelColour[0], voxelColour[1], voxelColour[2]];
}, {...pipelineFuncSettings, immutable: true, argumentTypes: {framebufTex: 'Array3D(3)'}});

Draw the CPU buffer into a GPU texture and retrieve it as an array:

const bufferTex = copyFramebufferFuncImmutable(buffer);
const texArray  = bufferTex.toArray();

Then look to see if what we did was properly copied from the CPU -> GPU -> CPU:

function debugPrint(arr) {
  for (let x = 0; x < gridSize; x++) {
    for (let y = 0; y < gridSize; y++) {
      const temp = [];
      for (let z = 0; z < gridSize; z++) {
        const currColour = arr[x][y][z];
        temp.push("("+currColour[0].toFixed(0)+","+currColour[1].toFixed(0)+","+currColour[2].toFixed(0)+")")
      }
      strArr.push(temp.join(", "));
    }
  }
  console.log(strArr.join("\n"));
}

... and get this comparative abomination:

CPU (Original/Control) i.e., debugPrint(buffer);:

(0,0,0), (0,0,1), (0,0,2), (0,0,3), (0,0,4), (0,0,5), (0,0,6), (0,0,7)
(0,1,0), (0,1,1), (0,1,2), (0,1,3), (0,1,4), (0,1,5), (0,1,6), (0,1,7)
(0,2,0), (0,2,1), (0,2,2), (0,2,3), (0,2,4), (0,2,5), (0,2,6), (0,2,7)
(0,3,0), (0,3,1), (0,3,2), (0,3,3), (0,3,4), (0,3,5), (0,3,6), (0,3,7)
(0,4,0), (0,4,1), (0,4,2), (0,4,3), (0,4,4), (0,4,5), (0,4,6), (0,4,7)
(0,5,0), (0,5,1), (0,5,2), (0,5,3), (0,5,4), (0,5,5), (0,5,6), (0,5,7)
(0,6,0), (0,6,1), (0,6,2), (0,6,3), (0,6,4), (0,6,5), (0,6,6), (0,6,7)
(0,7,0), (0,7,1), (0,7,2), (0,7,3), (0,7,4), (0,7,5), (0,7,6), (0,7,7)
(1,0,0), (1,0,1), (1,0,2), (1,0,3), (1,0,4), (1,0,5), (1,0,6), (1,0,7)
(1,1,0), (1,1,1), (1,1,2), (1,1,3), (1,1,4), (1,1,5), (1,1,6), (1,1,7)
(1,2,0), (1,2,1), (1,2,2), (1,2,3), (1,2,4), (1,2,5), (1,2,6), (1,2,7)
(1,3,0), (1,3,1), (1,3,2), (1,3,3), (1,3,4), (1,3,5), (1,3,6), (1,3,7)
(1,4,0), (1,4,1), (1,4,2), (1,4,3), (1,4,4), (1,4,5), (1,4,6), (1,4,7)
(1,5,0), (1,5,1), (1,5,2), (1,5,3), (1,5,4), (1,5,5), (1,5,6), (1,5,7)
(1,6,0), (1,6,1), (1,6,2), (1,6,3), (1,6,4), (1,6,5), (1,6,6), (1,6,7)
(1,7,0), (1,7,1), (1,7,2), (1,7,3), (1,7,4), (1,7,5), (1,7,6), (1,7,7)
(2,0,0), (2,0,1), (2,0,2), (2,0,3), (2,0,4), (2,0,5), (2,0,6), (2,0,7)
(2,1,0), (2,1,1), (2,1,2), (2,1,3), (2,1,4), (2,1,5), (2,1,6), (2,1,7)
(2,2,0), (2,2,1), (2,2,2), (2,2,3), (2,2,4), (2,2,5), (2,2,6), (2,2,7)
(2,3,0), (2,3,1), (2,3,2), (2,3,3), (2,3,4), (2,3,5), (2,3,6), (2,3,7)
(2,4,0), (2,4,1), (2,4,2), (2,4,3), (2,4,4), (2,4,5), (2,4,6), (2,4,7)
(2,5,0), (2,5,1), (2,5,2), (2,5,3), (2,5,4), (2,5,5), (2,5,6), (2,5,7)
(2,6,0), (2,6,1), (2,6,2), (2,6,3), (2,6,4), (2,6,5), (2,6,6), (2,6,7)
(2,7,0), (2,7,1), (2,7,2), (2,7,3), (2,7,4), (2,7,5), (2,7,6), (2,7,7)
(3,0,0), (3,0,1), (3,0,2), (3,0,3), (3,0,4), (3,0,5), (3,0,6), (3,0,7)
(3,1,0), (3,1,1), (3,1,2), (3,1,3), (3,1,4), (3,1,5), (3,1,6), (3,1,7)
(3,2,0), (3,2,1), (3,2,2), (3,2,3), (3,2,4), (3,2,5), (3,2,6), (3,2,7)
(3,3,0), (3,3,1), (3,3,2), (3,3,3), (3,3,4), (3,3,5), (3,3,6), (3,3,7)
(3,4,0), (3,4,1), (3,4,2), (3,4,3), (3,4,4), (3,4,5), (3,4,6), (3,4,7)
(3,5,0), (3,5,1), (3,5,2), (3,5,3), (3,5,4), (3,5,5), (3,5,6), (3,5,7)
(3,6,0), (3,6,1), (3,6,2), (3,6,3), (3,6,4), (3,6,5), (3,6,6), (3,6,7)
(3,7,0), (3,7,1), (3,7,2), (3,7,3), (3,7,4), (3,7,5), (3,7,6), (3,7,7)
(4,0,0), (4,0,1), (4,0,2), (4,0,3), (4,0,4), (4,0,5), (4,0,6), (4,0,7)
(4,1,0), (4,1,1), (4,1,2), (4,1,3), (4,1,4), (4,1,5), (4,1,6), (4,1,7)
(4,2,0), (4,2,1), (4,2,2), (4,2,3), (4,2,4), (4,2,5), (4,2,6), (4,2,7)
(4,3,0), (4,3,1), (4,3,2), (4,3,3), (4,3,4), (4,3,5), (4,3,6), (4,3,7)
(4,4,0), (4,4,1), (4,4,2), (4,4,3), (4,4,4), (4,4,5), (4,4,6), (4,4,7)
(4,5,0), (4,5,1), (4,5,2), (4,5,3), (4,5,4), (4,5,5), (4,5,6), (4,5,7)
(4,6,0), (4,6,1), (4,6,2), (4,6,3), (4,6,4), (4,6,5), (4,6,6), (4,6,7)
(4,7,0), (4,7,1), (4,7,2), (4,7,3), (4,7,4), (4,7,5), (4,7,6), (4,7,7)
(5,0,0), (5,0,1), (5,0,2), (5,0,3), (5,0,4), (5,0,5), (5,0,6), (5,0,7)
(5,1,0), (5,1,1), (5,1,2), (5,1,3), (5,1,4), (5,1,5), (5,1,6), (5,1,7)
(5,2,0), (5,2,1), (5,2,2), (5,2,3), (5,2,4), (5,2,5), (5,2,6), (5,2,7)
(5,3,0), (5,3,1), (5,3,2), (5,3,3), (5,3,4), (5,3,5), (5,3,6), (5,3,7)
(5,4,0), (5,4,1), (5,4,2), (5,4,3), (5,4,4), (5,4,5), (5,4,6), (5,4,7)
(5,5,0), (5,5,1), (5,5,2), (5,5,3), (5,5,4), (5,5,5), (5,5,6), (5,5,7)
(5,6,0), (5,6,1), (5,6,2), (5,6,3), (5,6,4), (5,6,5), (5,6,6), (5,6,7)
(5,7,0), (5,7,1), (5,7,2), (5,7,3), (5,7,4), (5,7,5), (5,7,6), (5,7,7)
(6,0,0), (6,0,1), (6,0,2), (6,0,3), (6,0,4), (6,0,5), (6,0,6), (6,0,7)
(6,1,0), (6,1,1), (6,1,2), (6,1,3), (6,1,4), (6,1,5), (6,1,6), (6,1,7)
(6,2,0), (6,2,1), (6,2,2), (6,2,3), (6,2,4), (6,2,5), (6,2,6), (6,2,7)
(6,3,0), (6,3,1), (6,3,2), (6,3,3), (6,3,4), (6,3,5), (6,3,6), (6,3,7)
(6,4,0), (6,4,1), (6,4,2), (6,4,3), (6,4,4), (6,4,5), (6,4,6), (6,4,7)
(6,5,0), (6,5,1), (6,5,2), (6,5,3), (6,5,4), (6,5,5), (6,5,6), (6,5,7)
(6,6,0), (6,6,1), (6,6,2), (6,6,3), (6,6,4), (6,6,5), (6,6,6), (6,6,7)
(6,7,0), (6,7,1), (6,7,2), (6,7,3), (6,7,4), (6,7,5), (6,7,6), (6,7,7)
(7,0,0), (7,0,1), (7,0,2), (7,0,3), (7,0,4), (7,0,5), (7,0,6), (7,0,7)
(7,1,0), (7,1,1), (7,1,2), (7,1,3), (7,1,4), (7,1,5), (7,1,6), (7,1,7)
(7,2,0), (7,2,1), (7,2,2), (7,2,3), (7,2,4), (7,2,5), (7,2,6), (7,2,7)
(7,3,0), (7,3,1), (7,3,2), (7,3,3), (7,3,4), (7,3,5), (7,3,6), (7,3,7)
(7,4,0), (7,4,1), (7,4,2), (7,4,3), (7,4,4), (7,4,5), (7,4,6), (7,4,7)
(7,5,0), (7,5,1), (7,5,2), (7,5,3), (7,5,4), (7,5,5), (7,5,6), (7,5,7)
(7,6,0), (7,6,1), (7,6,2), (7,6,3), (7,6,4), (7,6,5), (7,6,6), (7,6,7)
(7,7,0), (7,7,1), (7,7,2), (7,7,3), (7,7,4), (7,7,5), (7,7,6), (7,7,7)

GPU toArray() result i.e., debugPrint(texBuffer);:

(0,0,0), (1,0,0), (2,0,0), (3,0,0), (4,0,0), (5,0,0), (6,0,0), (7,0,0)
(0,1,0), (1,1,0), (2,1,0), (3,1,0), (4,1,0), (5,1,0), (6,1,0), (7,1,0)
(0,2,0), (1,2,0), (2,2,0), (3,2,0), (4,2,0), (5,2,0), (6,2,0), (7,2,0)
(0,3,0), (1,3,0), (2,3,0), (3,3,0), (4,3,0), (5,3,0), (6,3,0), (7,3,0)
(0,4,0), (1,4,0), (2,4,0), (3,4,0), (4,4,0), (5,4,0), (6,4,0), (7,4,0)
(0,5,0), (1,5,0), (2,5,0), (3,5,0), (4,5,0), (5,5,0), (6,5,0), (7,5,0)
(0,6,0), (1,6,0), (2,6,0), (3,6,0), (4,6,0), (5,6,0), (6,6,0), (7,6,0)
(0,7,0), (1,7,0), (2,7,0), (3,7,0), (4,7,0), (5,7,0), (6,7,0), (7,7,0)
(0,0,0), (1,0,4), (2,4,5), (3,2,4), (4,3,4), (5,4,4), (6,5,4), (7,6,4)
(0,0,1), (1,5,5), (2,1,5), (3,2,5), (4,3,5), (5,4,5), (6,5,5), (7,6,5)
(0,2,1), (1,0,6), (2,1,6), (3,2,6), (4,3,6), (5,4,6), (6,5,6), (7,6,5)
(0,0,3), (1,0,7), (2,1,7), (3,2,7), (4,3,7), (5,4,7), (6,7,5), (7,6,7)
(0,0,0), (1,1,0), (2,2,0), (3,3,0), (4,4,0), (5,0,5), (6,6,0), (7,7,0)
(0,0,1), (1,1,1), (2,2,1), (3,3,1), (4,1,5), (5,5,1), (6,6,1), (7,7,1)
(0,0,2), (1,1,2), (2,2,2), (3,2,5), (4,4,2), (5,5,2), (6,6,2), (7,7,2)
(0,0,3), (1,1,3), (2,3,5), (3,3,3), (4,4,3), (5,5,3), (6,6,3), (7,7,3)
(0,0,0), (1,0,4), (2,0,4), (3,0,4), (4,0,4), (5,0,4), (6,0,4), (7,0,4)
(0,1,1), (1,1,5), (2,1,5), (3,1,5), (4,1,5), (5,1,5), (6,1,5), (7,1,5)
(0,2,2), (1,2,6), (2,2,6), (3,2,6), (4,2,6), (5,2,6), (6,2,6), (7,2,6)
(0,3,3), (1,3,7), (2,3,7), (3,3,7), (4,3,7), (5,3,7), (6,3,7), (7,3,7)
(0,4,0), (1,4,0), (2,4,0), (3,4,0), (4,4,0), (5,4,0), (6,4,0), (7,4,0)
(0,5,1), (1,5,1), (2,5,1), (3,5,1), (4,5,1), (5,5,1), (6,5,1), (7,5,1)
(0,6,2), (1,6,2), (2,6,2), (3,6,2), (4,6,2), (5,6,2), (6,6,2), (7,6,2)
(0,7,3), (1,7,3), (2,7,3), (3,7,3), (4,7,3), (5,7,3), (6,7,3), (7,7,3)
(0,0,3), (1,0,3), (2,0,3), (3,0,3), (4,0,3), (5,0,3), (6,0,3), (7,0,3)
(0,1,3), (1,1,3), (2,1,3), (3,1,3), (4,1,3), (5,1,3), (6,1,3), (7,1,3)
(0,2,3), (1,2,3), (2,2,3), (3,2,3), (4,2,3), (5,2,3), (6,2,3), (7,2,3)
(0,3,3), (1,3,3), (2,3,3), (3,3,3), (4,3,3), (5,3,3), (6,3,3), (7,3,3)
(0,4,3), (1,4,3), (2,4,3), (3,4,3), (4,4,3), (5,4,3), (6,4,3), (7,4,3)
(0,5,3), (1,5,3), (2,5,3), (3,5,3), (4,5,3), (5,5,3), (6,5,3), (7,5,3)
(0,6,3), (1,6,3), (2,6,3), (3,6,3), (4,6,3), (5,6,3), (6,6,3), (7,6,3)
(0,7,3), (1,7,3), (2,7,3), (3,7,3), (4,7,3), (5,7,3), (6,7,3), (7,7,3)
(0,0,4), (1,0,4), (2,0,4), (3,0,4), (4,0,4), (5,0,4), (6,0,4), (7,0,4)
(0,1,4), (1,1,4), (2,1,4), (3,1,4), (4,1,4), (5,1,4), (6,1,4), (7,1,4)
(0,2,4), (1,2,4), (2,2,4), (3,2,4), (4,2,4), (5,2,4), (6,2,4), (7,2,4)
(0,3,4), (1,3,4), (2,3,4), (3,3,4), (4,3,4), (5,3,4), (6,3,4), (7,3,4)
(0,4,4), (1,4,4), (2,4,4), (3,4,4), (4,4,4), (5,4,4), (6,4,4), (7,4,4)
(0,5,4), (1,5,4), (2,5,4), (3,5,4), (4,5,4), (5,5,4), (6,5,4), (7,5,4)
(0,6,4), (1,6,4), (2,6,4), (3,6,4), (4,6,4), (5,6,4), (6,6,4), (7,6,4)
(0,7,4), (1,7,4), (2,7,4), (3,7,4), (4,7,4), (5,7,4), (6,7,4), (7,7,4)
(0,0,0), (1,0,5), (2,1,5), (3,2,5), (4,3,5), (5,5,1), (6,5,5), (7,6,5)
(0,0,1), (1,0,6), (2,1,6), (3,2,6), (4,6,1), (5,4,6), (6,5,6), (7,6,6)
(0,0,2), (1,0,7), (2,1,7), (3,7,1), (4,3,7), (5,4,7), (6,5,7), (7,6,7)
(0,0,0), (1,1,0), (2,0,1), (3,3,0), (4,4,0), (5,5,0), (6,6,0), (7,7,0)
(0,0,1), (1,1,1), (2,2,1), (3,3,1), (4,4,1), (5,5,1), (6,6,1), (7,7,1)
(0,2,1), (1,1,2), (2,2,2), (3,3,2), (4,4,2), (5,5,2), (6,6,2), (7,2,1)
(0,0,3), (1,1,3), (2,2,3), (3,3,3), (4,4,3), (5,5,3), (6,3,1), (7,7,3)
(0,0,4), (1,1,4), (2,2,4), (3,3,4), (4,4,4), (5,4,1), (6,6,4), (7,7,4)
(0,0,0), (1,0,5), (2,0,5), (3,0,5), (4,0,5), (5,0,5), (6,0,5), (7,0,5)
(0,1,1), (1,1,6), (2,1,6), (3,1,6), (4,1,6), (5,1,6), (6,1,6), (7,1,6)
(0,2,2), (1,2,7), (2,2,7), (3,2,7), (4,2,7), (5,2,7), (6,2,7), (7,2,7)
(0,3,0), (1,3,0), (2,3,0), (3,3,0), (4,3,0), (5,3,0), (6,3,0), (7,3,0)
(0,4,1), (1,4,1), (2,4,1), (3,4,1), (4,4,1), (5,4,1), (6,4,1), (7,4,1)
(0,5,2), (1,5,2), (2,5,2), (3,5,2), (4,5,2), (5,5,2), (6,5,2), (7,5,2)
(0,6,3), (1,6,3), (2,6,3), (3,6,3), (4,6,3), (5,6,3), (6,6,3), (7,6,3)
(0,7,4), (1,7,4), (2,7,4), (3,7,4), (4,7,4), (5,7,4), (6,7,4), (7,7,4)
(0,0,7), (1,0,7), (2,0,7), (3,0,7), (4,0,7), (5,0,7), (6,0,7), (7,0,7)
(0,1,7), (1,1,7), (2,1,7), (3,1,7), (4,1,7), (5,1,7), (6,1,7), (7,1,7)
(0,2,7), (1,2,7), (2,2,7), (3,2,7), (4,2,7), (5,2,7), (6,2,7), (7,2,7)
(0,3,7), (1,3,7), (2,3,7), (3,3,7), (4,3,7), (5,3,7), (6,3,7), (7,3,7)
(0,4,7), (1,4,7), (2,4,7), (3,4,7), (4,4,7), (5,4,7), (6,4,7), (7,4,7)
(0,5,7), (1,5,7), (2,5,7), (3,5,7), (4,5,7), (5,5,7), (6,5,7), (7,5,7)
(0,6,7), (1,6,7), (2,6,7), (3,6,7), (4,6,7), (5,6,7), (6,6,7), (7,6,7)
(0,7,7), (1,7,7), (2,7,7), (3,7,7), (4,7,7), (5,7,7), (6,7,7), (7,7,7)

How important is this (1-5)?

Strikes me as a pretty integral issue since there appears to be a non-identical transformation between CPU and GPU buffers.

Expected behavior (i.e. solution)

Those two arrays should be the same (or at least differ by an obvious matrix transform/mapping), instead the toArray() buffer is filled with duplicate data and errors that don't map at all to the original CPU buffer.

Ngôn ngữ chính
JavaScript
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Issue khác của gpujs/gpu.js

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