Question

我有一个iPad Pro 12.9in ML0F2X / A，带有iOS 12.1.1。我正在尝试创建从Uint16Array初始化的半浮点WebGL纹理：

    @IBAction func resetScoreButton(_ sender: Any) {

     let batsmenOneScoreValue = 0
        displayBatsmenOneScoreLabel.text = String(batsmenOneScoreValue)
    }

texImage2D失败，显示INVALID_OPERATION。我已经在iPad上使用Safari，Chrome和Firefox的最新移动版本（2019年1月）进行了测试。在使用远程调试的Safari中，我可以看到日志消息：

var halfExt = gl.getExtension("OES_texture_half_float");
...
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, 1, 1, 0, gl.RGBA,
   halfExt.HALF_FLOAT_OES, new Uint16Array([0, 0, 0, 0]));

如果我将Uint16Array替换为null，则在iPad上调用成功，但是我的纹理当然丢失了。

以下是代码段：

WebGL: INVALID_OPERATION: texImage2D: type HALF_FLOAT_OES but ArrayBufferView is not NULL

function log(msg) {
  var div = document.createElement("div");
  div.appendChild(document.createTextNode(msg));
  document.body.appendChild(div);
}

function glEnum(gl, v) {
  for (var key in gl) {
    if (gl[key] === v) {
      return key;
    }
  }
  return "0x" + v.toString(16);
}

// Get A WebGL context
var canvas = document.getElementById("c");
var gl = canvas.getContext("webgl");
if (gl) {

  function getExt(name) {
    var ext = gl.getExtension(name);
    log("Extension " + name + " is " + (ext ? "" : "NOT ") + "supported");
    return ext;
  }

  function checkError(test) {
    var err = gl.getError();
    if (err === 0)
      log(test + ": successful");
    else
      log(test + ": flagged error " + err + " = gl." + glEnum(gl, err));
  }

  var floatExt = getExt("OES_texture_float");
  getExt("OES_texture_float_linear");
  if (floatExt) {

    var tex = gl.createTexture();
    gl.bindTexture(gl.TEXTURE_2D, tex);
    gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, 1, 1, 0, gl.RGBA, gl.FLOAT, null);
    checkError("Create gl.FLOAT texture with NULL buffer");
    gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, 1, 1, 0, gl.RGBA, gl.FLOAT, new Float32Array([0, 0, 0, 0]));
    checkError("Create gl.FLOAT texture with Float32Array buffer");
  }

  var halfExt = getExt("OES_texture_half_float");
  getExt("OES_texture_half_float_linear");
  if (halfExt) {

    var tex = gl.createTexture();
    gl.bindTexture(gl.TEXTURE_2D, tex);
    gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, 1, 1, 0, gl.RGBA, halfExt.HALF_FLOAT_OES, null);
    checkError("Create halfExt.HALF_FLOAT_OES texture with NULL buffer");
    gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, 1, 1, 0, gl.RGBA, halfExt.HALF_FLOAT_OES, new Uint16Array([0, 0, 0, 0]));
    checkError("Create halfExt.HALF_FLOAT_OES texture with UInt16Array buffer");
  }
}

在Windows 6桌面版Firefox 60.4ESR和Chrome 71.0上，所有测试均成功。在iPad上，只有最后一个失败。如何在iPad上成功拨打电话？

谢谢...

Answer 1

Safari无法通过Webhook response

提交错误the WebGL Conformance Test for OES_texture_half_float

无法从iPad上的Uint16Array创建HALF_FLOAT_OES纹理

1 个答案: