1 files changed, 121 insertions, 0 deletions
diff --git a/dom/canvas/test/webgl-conf/checkout/conformance/rendering/gl-scissor-fbo-test.html b/dom/canvas/test/webgl-conf/checkout/conformance/rendering/gl-scissor-fbo-test.html
new file mode 100644
index 0000000000..9b402a8206
--- /dev/null
+++ b/dom/canvas/test/webgl-conf/checkout/conformance/rendering/gl-scissor-fbo-test.html
@@ -0,0 +1,121 @@
+<!--
+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.
+-->
+
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>WebGL Scissor FBO Test</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>
+</head>
+<body>
+<canvas id="canvas" width="16" height="16" style="width: 40px; height: 40px;"> </canvas>
+<canvas id="canvas2" width="16" height="16" style="width: 40px; height: 40px;"> </canvas>
+<div id="description"></div>
+<div id="console"></div>
+<script>
+"use strict";
+description("Checks the scissor does not change when switching framebuffers.");
+
+var wtu = WebGLTestUtils;
+var gl;
+
+function makeFramebuffer(width, height) {
+  var tex = gl.createTexture();
+  gl.bindTexture(gl.TEXTURE_2D, tex);
+  gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, width, height, 0, gl.RGBA, gl.UNSIGNED_BYTE, null);
+  gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
+  gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);
+  gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
+  gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
+  var fb = gl.createFramebuffer();
+  gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
+  gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, tex, 0);
+  shouldBe('gl.checkFramebufferStatus(gl.FRAMEBUFFER)', 'gl.FRAMEBUFFER_COMPLETE');
+  gl.bindFramebuffer(gl.FRAMEBUFFER, null);
+  return fb;
+}
+
+function checkCanvasRect(x, y, width, height, color, msg) {
+  debug("checking: " + x + ", " + y + ", " + width + ", " + height);
+  wtu.checkCanvasRect(gl, x, y, width, height, color, msg);
+}
+
+function runEntireTest(canvasName, antialias) {
+  debug("");
+  debug("== Running scissor fbo test with antialias:" + antialias + " ==");
+  debug("");
+
+  gl = wtu.create3DContext(canvasName, {antialias: antialias});
+  if (!gl) {
+    testFailed("context does not exist");
+    return;
+  }
+  testPassed("context exists");
+
+  var fb8x8 = makeFramebuffer(8, 8);
+  var fb32x32 = makeFramebuffer(32, 32);
+
+  var testScissor = function(scissorX, scissorY, scissorWidth, scissorHeight, msg) {
+    debug("");
+    debug(msg);
+
+    var test = function(fb, size) {
+      debug("");
+      debug("checking size: " + size);
+      gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
+      gl.clearColor(0, 1, 0, 1);
+      gl.clear(gl.COLOR_BUFFER_BIT);
+      var scissorRight = Math.min(scissorX + scissorWidth, size);
+      var scissorTop = Math.min(scissorY + scissorHeight, size);
+      var scWidth = scissorRight - scissorX;
+      var scHeight = scissorTop - scissorY;
+      var rightWidth = Math.min(size - scissorRight, 0);
+      var topHeight = Math.max(size - scissorTop, 0);
+      checkCanvasRect(scissorX, scissorY, scWidth, scHeight, [0, 255, 0, 255], "should be green");
+      checkCanvasRect(0, 0, size, scissorY, [255, 0, 0, 255], "should be red");
+      checkCanvasRect(0, scissorTop, size, topHeight, [255, 0, 0, 255], "should be red");
+      checkCanvasRect(0, 0, scissorX, size, [255, 0, 0, 255], "should be red");
+      checkCanvasRect(scissorRight, 0, scissorX, rightWidth, [255, 0, 0, 255], "should be red");
+    };
+
+    gl.disable(gl.SCISSOR_TEST);
+    gl.clearColor(1, 0, 0, 1);
+    gl.bindFramebuffer(gl.FRAMEBUFFER, null);
+    gl.clear(gl.COLOR_BUFFER_BIT);
+    gl.bindFramebuffer(gl.FRAMEBUFFER, fb8x8);
+    gl.clear(gl.COLOR_BUFFER_BIT);
+    gl.bindFramebuffer(gl.FRAMEBUFFER, fb32x32);
+    gl.clear(gl.COLOR_BUFFER_BIT);
+
+    gl.bindFramebuffer(gl.FRAMEBUFFER, fb32x32);
+    gl.enable(gl.SCISSOR_TEST);
+    gl.scissor(scissorX, scissorY, scissorWidth, scissorHeight);
+    test(null, 16);
+    test(fb8x8, 8);
+    test(fb32x32, 32);
+    test(null, 16);
+  };
+
+  testScissor(2, 4, 12, 10, "test scissor in middle");
+  testScissor(0, 0, 12, 10, "test scissor at 0,0");
+  testScissor(0, 0, 16, 16, "test scissor with size that matches drawingbuffer");
+
+  wtu.glErrorShouldBe(gl, gl.NO_ERROR, "there should be no errors");
+}
+
+runEntireTest("canvas", false);
+runEntireTest("canvas2", true);
+
+debug("");
+var successfullyParsed = true;
+</script>
+<script src="../../js/js-test-post.js"></script>
+
+</body>
+</html>