From 943f95fe4717459c845df7f6a10a039e5adf8e97 Mon Sep 17 00:00:00 2001
From: Anthony Ramine <n.oxyde@gmail.com>
Date: Wed, 19 Sep 2018 12:31:55 +0200
Subject: [PATCH 1/4] Remove some misplaced framebuffer validations

---
 components/script/dom/webglrenderingcontext.rs | 10 ----------
 1 file changed, 10 deletions(-)

diff --git a/components/script/dom/webglrenderingcontext.rs b/components/script/dom/webglrenderingcontext.rs
index 61671ee3b15..f299b3ff2e4 100644
--- a/components/script/dom/webglrenderingcontext.rs
+++ b/components/script/dom/webglrenderingcontext.rs
@@ -1303,19 +1303,9 @@ impl WebGLRenderingContextMethods for WebGLRenderingContext {
             // GL_OES_read_format support (assuming an underlying GLES
             // driver. Desktop is happy to format convert for us).
             constants::IMPLEMENTATION_COLOR_READ_FORMAT => {
-                handle_potential_webgl_error!(
-                    self,
-                    self.validate_framebuffer(),
-                    return NullValue()
-                );
                 return Int32Value(constants::RGBA as i32);
             },
             constants::IMPLEMENTATION_COLOR_READ_TYPE => {
-                handle_potential_webgl_error!(
-                    self,
-                    self.validate_framebuffer(),
-                    return NullValue()
-                );
                 return Int32Value(constants::UNSIGNED_BYTE as i32);
             },
             constants::COMPRESSED_TEXTURE_FORMATS => {

From a3d8b5d2d3c3b50e2c357b9dfd491acee78cb593 Mon Sep 17 00:00:00 2001
From: Anthony Ramine <n.oxyde@gmail.com>
Date: Wed, 19 Sep 2018 12:32:11 +0200
Subject: [PATCH 2/4] Fix the error when calling getProgramInfoLog on a deleted
 program (#20561)

---
 components/script/dom/webglprogram.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/components/script/dom/webglprogram.rs b/components/script/dom/webglprogram.rs
index e6cf894feca..3c2a17ca4fb 100644
--- a/components/script/dom/webglprogram.rs
+++ b/components/script/dom/webglprogram.rs
@@ -414,7 +414,7 @@ impl WebGLProgram {
     /// glGetProgramInfoLog
     pub fn get_info_log(&self) -> WebGLResult<String> {
         if self.is_deleted() {
-            return Err(WebGLError::InvalidOperation);
+            return Err(WebGLError::InvalidValue);
         }
         if self.link_called.get() {
             let shaders_compiled = match (self.fragment_shader.get(), self.vertex_shader.get()) {

From 2662739ee5f54c20847dffe7feacabb20b065580 Mon Sep 17 00:00:00 2001
From: Anthony Ramine <n.oxyde@gmail.com>
Date: Wed, 19 Sep 2018 12:38:35 +0200
Subject: [PATCH 3/4] Update WebGL tests

---
 tests/wpt/webgl/meta/MANIFEST.json            |  12 +-
 .../textures/misc/00_test_list.txt            |   1 +
 ...as-teximage-after-multiple-drawimages.html | 125 ++++++++++++++++++
 3 files changed, 137 insertions(+), 1 deletion(-)
 create mode 100644 tests/wpt/webgl/tests/conformance/textures/misc/canvas-teximage-after-multiple-drawimages.html

diff --git a/tests/wpt/webgl/meta/MANIFEST.json b/tests/wpt/webgl/meta/MANIFEST.json
index 62fda6944e2..c1b1f57adf1 100644
--- a/tests/wpt/webgl/meta/MANIFEST.json
+++ b/tests/wpt/webgl/meta/MANIFEST.json
@@ -15010,6 +15010,12 @@
      {}
     ]
    ],
+   "conformance/textures/misc/canvas-teximage-after-multiple-drawimages.html": [
+    [
+     "/_webgl/conformance/textures/misc/canvas-teximage-after-multiple-drawimages.html",
+     {}
+    ]
+   ],
    "conformance/textures/misc/compressed-tex-image.html": [
     [
      "/_webgl/conformance/textures/misc/compressed-tex-image.html",
@@ -36878,9 +36884,13 @@
    "testharness"
   ],
   "conformance/textures/misc/00_test_list.txt": [
-   "3c7636158223c16d24707ee209016b4c715d88c9",
+   "8a561de6f6f5b5ca80f11c7e5c353468225e4a67",
    "support"
   ],
+  "conformance/textures/misc/canvas-teximage-after-multiple-drawimages.html": [
+   "aac3306a7d4c3c08201e7d55e7ef549f3d8ad8e6",
+   "testharness"
+  ],
   "conformance/textures/misc/compressed-tex-image.html": [
    "af234ab29614fc3e566b27fe11df1854db333aa3",
    "testharness"
diff --git a/tests/wpt/webgl/tests/conformance/textures/misc/00_test_list.txt b/tests/wpt/webgl/tests/conformance/textures/misc/00_test_list.txt
index 3c763615822..8a561de6f6f 100644
--- a/tests/wpt/webgl/tests/conformance/textures/misc/00_test_list.txt
+++ b/tests/wpt/webgl/tests/conformance/textures/misc/00_test_list.txt
@@ -1,3 +1,4 @@
+--min-version 1.0.4 canvas-teximage-after-multiple-drawimages.html
 --max-version 1.9.9 compressed-tex-image.html
 copy-tex-image-and-sub-image-2d.html
 --min-version 1.0.2 copy-tex-image-2d-formats.html
diff --git a/tests/wpt/webgl/tests/conformance/textures/misc/canvas-teximage-after-multiple-drawimages.html b/tests/wpt/webgl/tests/conformance/textures/misc/canvas-teximage-after-multiple-drawimages.html
new file mode 100644
index 00000000000..aac3306a7d4
--- /dev/null
+++ b/tests/wpt/webgl/tests/conformance/textures/misc/canvas-teximage-after-multiple-drawimages.html
@@ -0,0 +1,125 @@
+<!--
+
+/*
+** Copyright (c) 2018 The Khronos Group Inc.
+**
+** Permission is hereby granted, free of charge, to any person obtaining a
+** copy of this software and/or associated documentation files (the
+** "Materials"), to deal in the Materials without restriction, including
+** without limitation the rights to use, copy, modify, merge, publish,
+** distribute, sublicense, and/or sell copies of the Materials, and to
+** permit persons to whom the Materials are furnished to do so, subject to
+** the following conditions:
+**
+** The above copyright notice and this permission notice shall be included
+** in all copies or substantial portions of the Materials.
+**
+** THE MATERIALS ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+** EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+** MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+** IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+** CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+** TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+** MATERIALS OR THE USE OR OTHER DEALINGS IN THE MATERIALS.
+*/
+
+-->
+
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>TexImage2D of 2D Canvas after multiple drawImages</title>
+<link rel="stylesheet" href="../../../resources/js-test-style.css"/>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src="../../../js/js-test-pre.js"></script>
+<script src="../../../js/webgl-test-utils.js"></script>
+<script>
+"use strict";
+const wtu = WebGLTestUtils;
+
+const sz = 512;
+let greenImage = null;
+
+function loadImageAndStart(startFunc) {
+  let c = document.createElement('canvas');
+  c.width = sz;
+  c.height = sz;
+  let ctx = c.getContext('2d');
+  ctx.fillStyle = 'rgb(0,255,0)';
+  ctx.fillRect(0, 0, sz, sz);
+  greenImage = wtu.makeImageFromCanvas(c, startFunc);
+}
+
+function runTest() {
+  description();
+  debug('Regression test for <a href="http://crbug.com/878545">http://crbug.com/878545</a>');
+  // Mimics the image-to-texture upload path from the old JavaScript
+  // port of O3D, salvaged at https://github.com/petersont/o3d .
+
+  // Create a canvas and draw the entire image into it.
+  let bigCanvas = document.createElement('canvas');
+  bigCanvas.width = greenImage.naturalWidth;
+  bigCanvas.height = greenImage.naturalHeight;
+  let bc = bigCanvas.getContext('2d');
+  bc.drawImage(greenImage, 0, 0, bigCanvas.width, bigCanvas.height);
+  // Create a temp canvas to flip vertically.
+  let tempCanvas = document.createElement('canvas');
+  tempCanvas.width = bigCanvas.width;
+  tempCanvas.height = bigCanvas.height;
+  let tc = tempCanvas.getContext('2d');
+  tc.translate(0, tempCanvas.height);
+  tc.scale(1, -1);
+  tc.drawImage(bigCanvas, 0, 0, tempCanvas.width, tempCanvas.height);
+  // Set up to draw via WebGL.
+  let c3d = document.getElementById('canvas');
+  let gl = wtu.create3DContext(c3d);
+  let prog = wtu.setupTexturedQuad(gl);
+  gl.uniform1i(gl.getUniformLocation(prog, 'tex'), 0);
+  let tex = gl.createTexture();
+  // Iterate through the large canvas, drawing pieces of it to a
+  // scratch canvas.
+  let scratchCanvas = document.createElement('canvas');
+  const width = tempCanvas.width / 2;
+  const height = tempCanvas.height / 2;
+  let bb = new Uint8Array(4 * c3d.width * c3d.height);
+  for (let jj = 0; jj < 2; ++jj) {
+    for (let ii = 0; ii < 2; ++ii) {
+      // Prepare texture.
+      scratchCanvas.width = width;
+      scratchCanvas.height = height;
+      let ctx = scratchCanvas.getContext('2d');
+      ctx.save();
+      ctx.translate(-(ii * width), -(jj * height));
+      ctx.scale(1.0, 1.0);
+      ctx.drawImage(tempCanvas, 0, 0, tempCanvas.width, tempCanvas.height);
+      gl.bindTexture(gl.TEXTURE_2D, tex);
+      gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE,
+                    scratchCanvas);
+      ctx.restore();
+      gl.generateMipmap(gl.TEXTURE_2D);
+      // Draw and check that rendering occurred properly.
+      gl.uniform1i(gl.getUniformLocation(prog, 'tex'), 0);
+      wtu.drawUnitQuad(gl);
+      let tolerance = 2;
+      wtu.checkCanvasRect(gl, 1, 1, c3d.width - 2, c3d.height - 2,
+                          [ 0, 255, 0, 255 ],
+                          "should be green",
+                          tolerance);
+
+    }
+  }
+
+  finishTest();
+}
+
+loadImageAndStart(runTest);
+</script>
+</head>
+<body>
+<div id="description"></div>
+<div id="console"></div>
+<canvas id="canvas" width="40" height="40"></canvas>
+</body>
+</html>

From aeaf895a055f0ccef4f7b242f012486c8dd85024 Mon Sep 17 00:00:00 2001
From: Anthony Ramine <n.oxyde@gmail.com>
Date: Wed, 19 Sep 2018 12:43:14 +0200
Subject: [PATCH 4/4] Add some bug links

---
 .../conformance/textures/misc/copy-tex-image-2d-formats.html.ini | 1 +
 .../meta/conformance/textures/misc/tex-input-validation.html.ini | 1 +
 2 files changed, 2 insertions(+)

diff --git a/tests/wpt/webgl/meta/conformance/textures/misc/copy-tex-image-2d-formats.html.ini b/tests/wpt/webgl/meta/conformance/textures/misc/copy-tex-image-2d-formats.html.ini
index 503a5efca8e..a4bd32b2816 100644
--- a/tests/wpt/webgl/meta/conformance/textures/misc/copy-tex-image-2d-formats.html.ini
+++ b/tests/wpt/webgl/meta/conformance/textures/misc/copy-tex-image-2d-formats.html.ini
@@ -1,4 +1,5 @@
 [copy-tex-image-2d-formats.html]
+  bug: https://github.com/servo/servo/issues/20595
   [WebGL test #32: getError expected: INVALID_OPERATION. Was NO_ERROR : should not be able to copyTexImage2D ALPHA from RGB]
     expected: FAIL
 
diff --git a/tests/wpt/webgl/meta/conformance/textures/misc/tex-input-validation.html.ini b/tests/wpt/webgl/meta/conformance/textures/misc/tex-input-validation.html.ini
index a86dfea0c35..a5e193befaf 100644
--- a/tests/wpt/webgl/meta/conformance/textures/misc/tex-input-validation.html.ini
+++ b/tests/wpt/webgl/meta/conformance/textures/misc/tex-input-validation.html.ini
@@ -1,4 +1,5 @@
 [tex-input-validation.html]
+  bug: https://github.com/servo/servo/issues/20595
   [WebGL test #45: getError expected: INVALID_OPERATION. Was NO_ERROR :  colorBufferFormat: RGB565 internalFormat: RGBA target: TEXTURE_2D]
     expected: FAIL