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+<!--
+
+/*
+** Copyright (c) 2016 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>WebGL BlitFramebuffer Stencil-only Tests</title>
+<link rel="stylesheet" href="../../resources/js-test-style.css"/>
+<script src="../../js/js-test-pre.js"></script>
+<script src="../../js/webgl-test-utils.js"></script>
+<script src="../../js/glsl-conformance-test.js"></script>
+
+<script id="vs" type="x-shader/x-vertex">#version 300 es
+in vec4 position;
+void main() {
+  gl_Position = position;
+}
+</script>
+<script id="fs" type="x-shader/x-fragment">#version 300 es
+out mediump vec4 colorOut;
+uniform mediump vec3 color;
+void main() {
+   colorOut = vec4(color, 1.0);
+}
+</script>
+
+</head>
+<body>
+<canvas id="example" width="8" height="8"></canvas>
+<div id="description"></div>
+<div id="console"></div>
+
+<script>
+"use strict";
+
+var wtu = WebGLTestUtils;
+description("This test covers some edge cases of blitFramebuffer with stencil.");
+
+var gl = wtu.create3DContext("example", undefined, 2);
+
+var program, colorLoc;
+
+function init_buffer(format) {
+  var buf = gl.createFramebuffer();
+  gl.bindFramebuffer(gl.FRAMEBUFFER, buf)
+  var tex = gl.createTexture();
+  gl.bindTexture(gl.TEXTURE_2D, tex);
+  gl.texStorage2D(gl.TEXTURE_2D, 1, gl.RGBA8, 16, 16);
+  gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, tex, 0);
+  var rbo = gl.createRenderbuffer();
+  gl.bindRenderbuffer(gl.RENDERBUFFER, rbo);
+  gl.renderbufferStorage(gl.RENDERBUFFER, format, 16, 16);
+  gl.framebufferRenderbuffer(gl.FRAMEBUFFER,
+      gl.DEPTH_STENCIL_ATTACHMENT, gl.RENDERBUFFER, rbo);
+
+  gl.clearBufferfi(gl.DEPTH_STENCIL, 0, 1.0, 0);
+
+  wtu.glErrorShouldBe(gl, gl.NO_ERROR, "after buffer init");
+  shouldBe('gl.checkFramebufferStatus(gl.FRAMEBUFFER)', 'gl.FRAMEBUFFER_COMPLETE');
+
+  return { fbo: buf, color: tex, depthStencil: rbo };
+}
+
+var quadVB;
+
+function drawQuad(depth) {
+  if (!quadVB) {
+    quadVB = gl.createBuffer()
+  }
+
+  var quadVerts = new Float32Array(3 * 6);
+  quadVerts[0] = -1.0; quadVerts[1] =   1.0; quadVerts[2] = depth;
+  quadVerts[3] = -1.0; quadVerts[4] =  -1.0; quadVerts[5] = depth;
+  quadVerts[6] =  1.0; quadVerts[7] =  -1.0; quadVerts[8] = depth;
+  quadVerts[9] = -1.0; quadVerts[10] =  1.0; quadVerts[11] = depth;
+  quadVerts[12] = 1.0; quadVerts[13] = -1.0; quadVerts[14] = depth;
+  quadVerts[15] = 1.0; quadVerts[16] =  1.0; quadVerts[17] = depth;
+
+  gl.bindBuffer(gl.ARRAY_BUFFER, quadVB);
+  gl.bufferData(gl.ARRAY_BUFFER, quadVerts, gl.STATIC_DRAW);
+  gl.vertexAttribPointer(0, 3, gl.FLOAT, gl.FALSE, 0, 0);
+  gl.enableVertexAttribArray(0);
+  gl.drawArrays(gl.TRIANGLES, 0, 6);
+
+  wtu.glErrorShouldBe(gl, gl.NO_ERROR, "after drawQuad");
+}
+
+// Test based on dEQP-GLES3.functional.blit.depth_stencil.depth_24_stencil8_stencil_only
+function test_stencil_only_blit(format) {
+  debug("testing format: " + wtu.glEnumToString(format))
+
+  var src = init_buffer(format);
+  var dest = init_buffer(format);
+
+  gl.bindFramebuffer(gl.FRAMEBUFFER, src.fbo);
+  gl.viewport(0, 0, 16, 16);
+
+  // Fill source with red, depth = 0.5, stencil = 7
+  gl.enable(gl.DEPTH_TEST);
+  gl.enable(gl.STENCIL_TEST);
+  gl.stencilOp(gl.KEEP, gl.KEEP, gl.REPLACE);
+  gl.stencilFunc(gl.ALWAYS, 7, 0xFF);
+  gl.uniform3f(colorLoc, 1.0, 0.0, 0.0);
+  drawQuad(0.5);
+
+  // Fill dest with yellow, depth = 0.0, stencil = 1
+  gl.bindFramebuffer(gl.FRAMEBUFFER, dest.fbo);
+  gl.stencilFunc(gl.ALWAYS, 1, 0xff);
+  gl.uniform3f(colorLoc, 1.0, 1.0, 0.0);
+  drawQuad(0.0);
+
+  // Perform copy.
+  gl.bindFramebuffer(gl.READ_FRAMEBUFFER, src.fbo);
+  gl.bindFramebuffer(gl.DRAW_FRAMEBUFFER, dest.fbo);
+  gl.blitFramebuffer(0, 0, 16, 16, 0, 0, 16, 16, gl.STENCIL_BUFFER_BIT, gl.NEAREST);
+
+  // Render blue where depth < 0, decrement on depth failure.
+  gl.bindFramebuffer(gl.FRAMEBUFFER, dest.fbo);
+  gl.stencilOp(gl.KEEP, gl.DECR, gl.KEEP);
+  gl.stencilFunc(gl.ALWAYS, 0, 0xff);
+
+  gl.uniform3f(colorLoc, 0.0, 0.0, 1.0);
+  drawQuad(0.0);
+
+  // Render green where stencil == 6.
+  gl.disable(gl.DEPTH_TEST);
+  gl.stencilOp(gl.KEEP, gl.KEEP, gl.KEEP);
+  gl.stencilFunc(gl.EQUAL, 6, 0xff);
+
+  gl.uniform3f(colorLoc, 0.0, 1.0, 0.0);
+  drawQuad(0.0);
+
+  wtu.glErrorShouldBe(gl, gl.NO_ERROR, "after test");
+  wtu.checkCanvasRect(gl, 0, 0, 16, 16, [0, 255, 0, 255],
+                      "stencil test should be green");
+
+  gl.deleteFramebuffer(src.fbo);
+  gl.deleteFramebuffer(dest.fbo);
+  gl.deleteTexture(src.color);
+  gl.deleteTexture(dest.color);
+  gl.deleteRenderbuffer(src.depthStencil);
+  gl.deleteRenderbuffer(dest.depthStencil);
+}
+
+if (!gl) {
+    testFailed("WebGL context does not exist");
+} else {
+    testPassed("WebGL context exists");
+
+    program = wtu.setupProgram(gl, ["vs", "fs"], ["position"]);
+    wtu.glErrorShouldBe(gl, gl.NO_ERROR, "after program initialization");
+    shouldBe('gl.getProgramParameter(program, gl.LINK_STATUS)', 'true');
+
+    colorLoc = gl.getUniformLocation(program, "color")
+    wtu.glErrorShouldBe(gl, gl.NO_ERROR, "query uniform location");
+    shouldBeNonNull('colorLoc')
+
+    test_stencil_only_blit(gl.DEPTH24_STENCIL8);
+    test_stencil_only_blit(gl.DEPTH32F_STENCIL8);
+}
+
+var successfullyParsed = true;
+</script>
+<script src="../../js/js-test-post.js"></script>
+
+</body>
+</html>