1 files changed, 226 insertions, 0 deletions
diff --git a/dom/canvas/test/webgl-conf/checkout/js/tests/webgl-compressed-texture-size-limit.js b/dom/canvas/test/webgl-conf/checkout/js/tests/webgl-compressed-texture-size-limit.js
new file mode 100644
index 0000000000..6fad5520f2
--- /dev/null
+++ b/dom/canvas/test/webgl-conf/checkout/js/tests/webgl-compressed-texture-size-limit.js
@@ -0,0 +1,226 @@
+/*
+Copyright (c) 2019 The Khronos Group Inc.
+Use of this source code is governed by an MIT-style license that can be
+found in the LICENSE.txt file.
+*/
+
+'use strict';
+
+var runCompressedTextureSizeLimitTest = function(maxArrayBufferSizeBytes, positiveCubeMapMaxSize) {
+
+  function numLevelsFromSize(size) {
+    var levels = 0;
+    while ((size >> levels) > 0) {
+      ++levels;
+    }
+    return levels;
+  }
+
+  // More formats can be added here when more texture compression extensions are enabled in WebGL.
+  var validFormats = {
+      COMPRESSED_RGB_S3TC_DXT1_EXT        : 0x83F0,
+      COMPRESSED_RGBA_S3TC_DXT1_EXT       : 0x83F1,
+      COMPRESSED_RGBA_S3TC_DXT3_EXT       : 0x83F2,
+      COMPRESSED_RGBA_S3TC_DXT5_EXT       : 0x83F3,
+  };
+
+  // format specific restrictions for COMPRESSED_RGB_S3TC_DXT1_EXT and COMPRESSED_RGBA_S3TC_DXT1_EXT
+  // on the byteLength of the ArrayBufferView, pixels
+  function func1 (width, height)
+  {
+      return Math.floor((width + 3) / 4) * Math.floor((height + 3) / 4) * 8;
+  }
+
+  // format specific restrictions for COMPRESSED_RGBA_S3TC_DXT3_EXT and COMPRESSED_RGBA_S3TC_DXT5_EXT
+  // on the byteLength of the ArrayBufferView, pixels
+  function func2 (width, height)
+  {
+      return Math.floor((width + 3) / 4) * Math.floor((height + 3) / 4) * 16;
+  }
+
+  var wtu = WebGLTestUtils;
+  var gl = wtu.create3DContext("example");
+  var tests = [
+    // More tests can be added here when more texture compression extensions are enabled in WebGL.
+    // Level 0 image width and height must be a multiple of the sizeStep.
+    { extension: "WEBGL_compressed_texture_s3tc", format: validFormats.COMPRESSED_RGB_S3TC_DXT1_EXT, dataType: Uint8Array, func: func1, sizeStep: 4},
+    { extension: "WEBGL_compressed_texture_s3tc", format: validFormats.COMPRESSED_RGBA_S3TC_DXT1_EXT, dataType: Uint8Array, func: func1, sizeStep: 4},
+    { extension: "WEBGL_compressed_texture_s3tc", format: validFormats.COMPRESSED_RGBA_S3TC_DXT3_EXT, dataType: Uint8Array, func: func2, sizeStep: 4},
+    { extension: "WEBGL_compressed_texture_s3tc", format: validFormats.COMPRESSED_RGBA_S3TC_DXT5_EXT, dataType: Uint8Array, func: func2, sizeStep: 4},
+  ];
+
+  // Note: We expressly only use 2 textures because first a texture will be defined
+  // using all mip levels of 1 format, then for a moment it will have mixed formats which
+  // may uncover bugs.
+  var targets = [
+    { target: gl.TEXTURE_2D,
+      maxSize: gl.getParameter(gl.MAX_TEXTURE_SIZE),
+      tex: gl.createTexture(),
+      targets: [gl.TEXTURE_2D]
+    },
+    { target: gl.TEXTURE_CUBE_MAP,
+      maxSize: gl.getParameter(gl.MAX_CUBE_MAP_TEXTURE_SIZE),
+      tex: gl.createTexture(),
+      targets: [
+        gl.TEXTURE_CUBE_MAP_POSITIVE_X,
+        gl.TEXTURE_CUBE_MAP_NEGATIVE_X,
+        gl.TEXTURE_CUBE_MAP_POSITIVE_Y,
+        gl.TEXTURE_CUBE_MAP_NEGATIVE_Y,
+        gl.TEXTURE_CUBE_MAP_POSITIVE_Z,
+        gl.TEXTURE_CUBE_MAP_NEGATIVE_Z
+      ]
+    }
+  ];
+
+  function getSharedArrayBufferSize() {
+    var sharedArrayBufferSize = 0;
+    for (var tt = 0; tt < tests.length; ++tt) {
+      var test = tests[tt];
+      for (var trg = 0; trg < targets.length; ++trg) {
+        var t = targets[trg];
+        var bufferSizeNeeded;
+        if (t.target === gl.TEXTURE_CUBE_MAP) {
+          var positiveTestSize = Math.min(2048, t.maxSize);
+          bufferSizeNeeded = test.func(positiveTestSize, positiveTestSize);
+        } else {
+          bufferSizeNeeded = test.func(t.maxSize, test.sizeStep);
+        }
+        if (bufferSizeNeeded > sharedArrayBufferSize) {
+          sharedArrayBufferSize = bufferSizeNeeded;
+        }
+        bufferSizeNeeded = test.func(t.maxSize + test.sizeStep, t.maxSize + test.sizeStep);
+        // ArrayBuffers can be at most 4GB (minus 1 byte).
+        if (bufferSizeNeeded > sharedArrayBufferSize && bufferSizeNeeded <= maxArrayBufferSizeBytes) {
+          sharedArrayBufferSize = bufferSizeNeeded;
+        }
+      }
+    }
+    return sharedArrayBufferSize;
+  }
+
+  // Share an ArrayBuffer among tests to avoid too many large allocations
+  var sharedArrayBuffer = new ArrayBuffer(getSharedArrayBufferSize());
+
+  gl.pixelStorei(gl.UNPACK_ALIGNMENT, 1);
+
+  var trg = 0;
+  var tt = 0;
+  runNextTest();
+
+  function runNextTest() {
+    var t = targets[trg];
+
+    if (tt == 0) {
+      var tex = t.tex;
+      gl.bindTexture(t.target, tex);
+
+      debug("");
+      debug("max size for " + wtu.glEnumToString(gl, t.target) + ": " + t.maxSize);
+    }
+
+    var test = tests[tt];
+    testFormatType(t, test);
+    ++tt;
+    if (tt == tests.length) {
+      tt = 0;
+      ++trg;
+      if (trg == targets.length) {
+        finishTest();
+        return;
+      }
+    }
+    wtu.dispatchPromise(runNextTest);
+  }
+
+  function testFormatType(t, test) {
+    var positiveTestSize = t.maxSize;
+    var positiveTestOtherDimension = test.sizeStep;
+    if (t.target === gl.TEXTURE_CUBE_MAP) {
+      // Can't always test the maximum size since that can cause OOM:
+      positiveTestSize = Math.min(positiveCubeMapMaxSize, t.maxSize);
+      // Cube map textures need to be square:
+      positiveTestOtherDimension = positiveTestSize;
+    }
+    var positiveTestLevels = numLevelsFromSize(positiveTestSize);
+    var numLevels = numLevelsFromSize(t.maxSize);
+    debug("");
+    debug("num levels: " + numLevels + ", levels used in positive test: " + positiveTestLevels);
+
+    debug("");
+
+    // Query the extension and store globally so shouldBe can access it
+    var ext = wtu.getExtensionWithKnownPrefixes(gl, test.extension);
+    if (ext) {
+
+      testPassed("Successfully enabled " + test.extension + " extension");
+
+      for (var j = 0; j < t.targets.length; ++j) {
+        var target = t.targets[j];
+        debug("");
+        debug(wtu.glEnumToString(gl, target) + " " + wtu.glEnumToString(ext, test.format));
+
+        // positive test
+        var size = positiveTestSize;
+        var otherDimension = positiveTestOtherDimension;
+        for (var i = 0; i < positiveTestLevels; i++) {
+          var pixels = new test.dataType(sharedArrayBuffer, 0, test.func(size, otherDimension));
+          gl.compressedTexImage2D(target, i, test.format, size, otherDimension, 0, pixels);
+          wtu.glErrorShouldBe(gl, gl.NO_ERROR, "uploading compressed texture should generate NO_ERROR."
+              + "level is " + i + ", size is " + size + "x" + otherDimension);
+          size /= 2;
+          otherDimension /= 2;
+          if (otherDimension < 1) {
+              otherDimension = 1;
+          }
+        }
+
+        var numLevels = numLevelsFromSize(t.maxSize);
+
+        // out of bounds tests
+
+        // width or height out of bounds
+        if (t.target != gl.TEXTURE_CUBE_MAP) {
+            // only width out of bounds
+            var wideAndShortDataSize = test.func(t.maxSize + test.sizeStep, test.sizeStep);
+            var pixelsNegativeTest1 = new test.dataType(sharedArrayBuffer, 0, wideAndShortDataSize);
+            gl.compressedTexImage2D(target, 0, test.format, t.maxSize + test.sizeStep, test.sizeStep, 0, pixelsNegativeTest1);
+            wtu.glErrorShouldBe(gl, gl.INVALID_VALUE, "width out of bounds: should generate INVALID_VALUE."
+                + " level is 0, size is " + (t.maxSize + test.sizeStep) + "x" + (test.sizeStep));
+
+            // only height out of bounds
+            var narrowAndTallDataSize = test.func(test.sizeStep, t.maxSize + test.sizeStep);
+            var pixelsNegativeTest1 = new test.dataType(sharedArrayBuffer, 0, narrowAndTallDataSize);
+            gl.compressedTexImage2D(target, 0, test.format, test.sizeStep, t.maxSize + test.sizeStep, 0, pixelsNegativeTest1);
+            wtu.glErrorShouldBe(gl, gl.INVALID_VALUE, "height out of bounds: should generate INVALID_VALUE."
+                + " level is 0, size is " + (test.sizeStep) + "x" + (t.maxSize + test.sizeStep));
+        }
+
+        // both width and height out of the maximum bounds simultaneously
+        var squareDataSize = test.func(t.maxSize + test.sizeStep, t.maxSize + test.sizeStep);
+        // this check assumes that each element is 1 byte
+        if (squareDataSize > sharedArrayBuffer.byteLength) {
+          testPassed("Unable to test square texture larger than maximum size due to ArrayBuffer size limitations -- this is legal");
+        } else {
+          var pixelsNegativeTest1 = new test.dataType(sharedArrayBuffer, 0, squareDataSize);
+          gl.compressedTexImage2D(target, 0, test.format, t.maxSize + test.sizeStep, t.maxSize + test.sizeStep, 0, pixelsNegativeTest1);
+          wtu.glErrorShouldBe(gl, gl.INVALID_VALUE, "width and height out of bounds: should generate INVALID_VALUE."
+              + " level is 0, size is " + (t.maxSize + test.sizeStep) + "x" + (t.maxSize + test.sizeStep));
+        }
+
+        // level out of bounds
+        var pixelsNegativeTest2 = new test.dataType(sharedArrayBuffer, 0, test.func(256, 256));
+        gl.compressedTexImage2D(target, numLevels, test.format, 256, 256, 0, pixelsNegativeTest2);
+        wtu.glErrorShouldBe(gl, gl.INVALID_VALUE, "level out of bounds: should generate INVALID_VALUE."
+            + " level is " + numLevels + ", size is 256x256");
+        //width and height out of bounds for specified level
+        gl.compressedTexImage2D(target, numLevels - 1, test.format, 256, 256, 0, pixelsNegativeTest2);
+        wtu.glErrorShouldBe(gl, gl.INVALID_VALUE, "width or height out of bounds for specified level: should generate INVALID_VALUE."
+            + " level is " + (numLevels - 1) + ", size is 256x256");
+      }
+    }
+    else {
+      testPassed("No " + test.extension + " extension support -- this is legal");
+    }
+  }
+
+};