LayoutTests/webgl/1.0.3/resources/webgl_test_files/conformance/canvas/drawingbuffer-hd-dpi-test.html - WebKit - Git at Google

 <!--

 /*
 ** Copyright (c) 2012 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 DrawingBuffer dimensions on HD-DPI machines test</title>
 <link rel="stylesheet" href="../../resources/js-test-style.css"/>
 <script src="../../resources/js-test-pre.js"></script>
 <script src="../resources/webgl-test-utils.js"></script>
 </head>
 <body>
 <div id="description"></div>
 <div id="console"></div>
 <script id="vshaderGrid" type="x-shader/x-vertex">
 attribute vec4 a_position;
 void main()
 {
   gl_Position = a_position;
 }
 </script>

 <script id="fshaderGrid" type="x-shader/x-fragment">
 precision mediump float;
 void main()
 {
   float r = mod(gl_FragCoord.x, 2.0) < 1.0 ? 0.0 : 1.0;
   float g = mod(gl_FragCoord.y, 2.0) < 1.0 ? 0.0 : 1.0;
   gl_FragColor = vec4(r, g, 0, 1);
 }
 </script>
 <script>
 "use strict";
 description();
 debug("");

 var gl;
 var canvas;

 function checkDimensions() {
   // We expect that for the sizes being testing drawingBufferWidth and drawingBufferHeight
   // will match canvas.width and canvas.height.

   // We need to test that devicePixelRatio does not effect the backbuffer size of a canvas.
   shouldBe('gl.drawingBufferWidth', 'canvas.width');
   shouldBe('gl.drawingBufferHeight', 'canvas.height');
 }

 // This uses gl_FragCoord to draw a device pixel relavent pattern.
 // If drawBufferWidth or drawBufferHeight are not in device pixels
 // this test should fail.
 function checkGrid(gl, width, height) {
   var program = wtu.setupProgram(gl, ["vshaderGrid", "fshaderGrid"], ["a_position"]);
   wtu.setupUnitQuad(gl);
   gl.useProgram(program);
   shouldBe('gl.getError()', 'gl.NO_ERROR');

   wtu.clearAndDrawUnitQuad(gl);

   var pixels = new Uint8Array(width * height * 4);
   gl.readPixels(0, 0, width, height, gl.RGBA, gl.UNSIGNED_BYTE, pixels);

   var colors = [
     [ { color: [0,   0, 0, 255], name: "black" },  { color: [255,   0, 0, 255], name: "red"    } ],
     [ { color: [0, 255, 0, 255], name: "green" },  { color: [255, 255, 0, 255], name: "yellow" } ],
   ];

   for (var yy = 0; yy < height; ++yy) {
     for (var xx = 0; xx < width; ++xx) {
       var info = colors[yy % 2][xx % 2];
       var color = info.color;
       var offset = (yy * width + xx) * 4;
       for (var jj = 0; jj < 4; ++jj) {
         if (pixels[offset + jj] != color[jj]) {
           var actual = [pixels[offset], pixels[offset + 1], pixels[offset + 2], pixels[offset + 3]];
           testFailed("at " + xx + ", " + yy + " expected " + color + "(" + info.name + ") was " + actual);
           return;
         }
       }
     }
   }
   testPassed("grid rendered correctly");
 }

 // This passes device coordinate vertices in to make sure gl.viewport is not being mucked with.
 function checkQuad(gl, width, height) {
   var deviceToClipSpace = function(value, range) {
     return value / range * 2 - 1;
   }

   var program = wtu.setupColorQuad(gl);

   // draw a small green square in the top right corner.
   var deviceX1 = width - 4;
   var deviceX2 = width;
   var deviceY1 = height - 4;
   var deviceY2 = height;

   var clipX1 = deviceToClipSpace(deviceX1, width);
   var clipX2 = deviceToClipSpace(deviceX2, width);
   var clipY1 = deviceToClipSpace(deviceY1, height);
   var clipY2 = deviceToClipSpace(deviceY2, height);

   var vertexObject = gl.createBuffer();
   gl.bindBuffer(gl.ARRAY_BUFFER, vertexObject);
   gl.bufferData(
       gl.ARRAY_BUFFER,
       new Float32Array(
         [ clipX2, clipY2,
           clipX1, clipY2,
           clipX1, clipY1,
           clipX2, clipY2,
           clipX1, clipY1,
           clipX2, clipY1]),
       gl.STATIC_DRAW);
   gl.enableVertexAttribArray(0);
   gl.vertexAttribPointer(0, 2, gl.FLOAT, false, 0, 0);

   var green = [0, 255, 0, 255];
   var black = [0, 0, 0, 0];
   gl.clearColor(0, 0, 0, 0);
   gl.clear(gl.COLOR_BUFFER_BIT);
   wtu.drawUByteColorQuad(gl, [0, 255, 0, 255]);

   var squareWidth = deviceX2 - deviceX1;
   var squareHeight = deviceY2 - deviceY1;

   // check the square.
   wtu.checkCanvasRect(gl, deviceX1, deviceY1, squareWidth, squareHeight, green, "should be green");
   // check outside the square.
   wtu.checkCanvasRect(gl, 0, 0, width, height - squareHeight, black, "should be black");
   wtu.checkCanvasRect(gl, 0, height - squareHeight, width - squareWidth, squareHeight, black, "should be black");
 }


 function test(desiredWidth, desiredHeight) {
   debug("");
   debug("testing canvas width = " + desiredWidth + ", height = " + desiredHeight);

   // Make a fresh canvas.
   canvas = document.createElement("canvas");
   canvas.width = desiredWidth;
   canvas.height = desiredHeight;

   // This 'gl' must be global for shouldBe to work.
   gl = wtu.create3DContext(canvas, {antialias: false});
   if (!gl) {
     testFailed("context does not exist");
   } else {
     testPassed("context exists");

     // Check the dimensions are correct.
     checkDimensions();

     // Draw a pixel grid using a shader that draws in device coordinates
     checkGrid(gl, desiredWidth, desiredHeight);

     // Draw a quad in the top right corner.
     checkQuad(gl, desiredWidth, desiredHeight);

     shouldBe('gl.getError()', 'gl.NO_ERROR');

     debug("");
     debug("testing resizing canvas to width = " + desiredWidth + ", height = " + desiredHeight);

     var oldViewport = gl.getParameter(gl.VIEWPORT);

     // flip width and height
     canvas.width = desiredHeight;
     canvas.height = desiredWidth;

     // fix the viewport
     gl.viewport(0, 0, desiredHeight, desiredWidth);

     // Check the dimensions are correct.
     checkDimensions();

     // Draw a pixel grid using a shader that draws in device coordinates
     checkGrid(gl, desiredHeight, desiredWidth);

     // Draw a quad in the top right corner.
     checkQuad(gl, desiredHeight, desiredWidth);

     shouldBe('gl.getError()', 'gl.NO_ERROR');
   }
 }

 var wtu = WebGLTestUtils;

 // test a few sizes
 test(32, 16);
 test(128, 64);
 test(256, 512);

 debug("")
 var successfullyParsed = true;
 </script>
 <script src="../../resources/js-test-post.js"></script>
 </body>
 </html>
	<!--

	/*
	** Copyright (c) 2012 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 DrawingBuffer dimensions on HD-DPI machines test</title>
	<link rel="stylesheet" href="../../resources/js-test-style.css"/>
	<script src="../../resources/js-test-pre.js"></script>
	<script src="../resources/webgl-test-utils.js"></script>
	</head>
	<body>
	<div id="description"></div>
	<div id="console"></div>
	<script id="vshaderGrid" type="x-shader/x-vertex">
	attribute vec4 a_position;
	void main()
	{
	gl_Position = a_position;
	}
	</script>

	<script id="fshaderGrid" type="x-shader/x-fragment">
	precision mediump float;
	void main()
	{
	float r = mod(gl_FragCoord.x, 2.0) < 1.0 ? 0.0 : 1.0;
	float g = mod(gl_FragCoord.y, 2.0) < 1.0 ? 0.0 : 1.0;
	gl_FragColor = vec4(r, g, 0, 1);
	}
	</script>
	<script>
	"use strict";
	description();
	debug("");

	var gl;
	var canvas;

	function checkDimensions() {
	// We expect that for the sizes being testing drawingBufferWidth and drawingBufferHeight
	// will match canvas.width and canvas.height.

	// We need to test that devicePixelRatio does not effect the backbuffer size of a canvas.
	shouldBe('gl.drawingBufferWidth', 'canvas.width');
	shouldBe('gl.drawingBufferHeight', 'canvas.height');
	}

	// This uses gl_FragCoord to draw a device pixel relavent pattern.
	// If drawBufferWidth or drawBufferHeight are not in device pixels
	// this test should fail.
	function checkGrid(gl, width, height) {
	var program = wtu.setupProgram(gl, ["vshaderGrid", "fshaderGrid"], ["a_position"]);
	wtu.setupUnitQuad(gl);
	gl.useProgram(program);
	shouldBe('gl.getError()', 'gl.NO_ERROR');

	wtu.clearAndDrawUnitQuad(gl);

	var pixels = new Uint8Array(width * height * 4);
	gl.readPixels(0, 0, width, height, gl.RGBA, gl.UNSIGNED_BYTE, pixels);

	var colors = [
	[ { color: [0, 0, 0, 255], name: "black" }, { color: [255, 0, 0, 255], name: "red" } ],
	[ { color: [0, 255, 0, 255], name: "green" }, { color: [255, 255, 0, 255], name: "yellow" } ],
	];

	for (var yy = 0; yy < height; ++yy) {
	for (var xx = 0; xx < width; ++xx) {
	var info = colors[yy % 2][xx % 2];
	var color = info.color;
	var offset = (yy * width + xx) * 4;
	for (var jj = 0; jj < 4; ++jj) {
	if (pixels[offset + jj] != color[jj]) {
	var actual = [pixels[offset], pixels[offset + 1], pixels[offset + 2], pixels[offset + 3]];
	testFailed("at " + xx + ", " + yy + " expected " + color + "(" + info.name + ") was " + actual);
	return;
	}
	}
	}
	}
	testPassed("grid rendered correctly");
	}

	// This passes device coordinate vertices in to make sure gl.viewport is not being mucked with.
	function checkQuad(gl, width, height) {
	var deviceToClipSpace = function(value, range) {
	return value / range * 2 - 1;
	}

	var program = wtu.setupColorQuad(gl);

	// draw a small green square in the top right corner.
	var deviceX1 = width - 4;
	var deviceX2 = width;
	var deviceY1 = height - 4;
	var deviceY2 = height;

	var clipX1 = deviceToClipSpace(deviceX1, width);
	var clipX2 = deviceToClipSpace(deviceX2, width);
	var clipY1 = deviceToClipSpace(deviceY1, height);
	var clipY2 = deviceToClipSpace(deviceY2, height);

	var vertexObject = gl.createBuffer();
	gl.bindBuffer(gl.ARRAY_BUFFER, vertexObject);
	gl.bufferData(
	gl.ARRAY_BUFFER,
	new Float32Array(
	[ clipX2, clipY2,
	clipX1, clipY2,
	clipX1, clipY1,
	clipX2, clipY2,
	clipX1, clipY1,
	clipX2, clipY1]),
	gl.STATIC_DRAW);
	gl.enableVertexAttribArray(0);
	gl.vertexAttribPointer(0, 2, gl.FLOAT, false, 0, 0);

	var green = [0, 255, 0, 255];
	var black = [0, 0, 0, 0];
	gl.clearColor(0, 0, 0, 0);
	gl.clear(gl.COLOR_BUFFER_BIT);
	wtu.drawUByteColorQuad(gl, [0, 255, 0, 255]);

	var squareWidth = deviceX2 - deviceX1;
	var squareHeight = deviceY2 - deviceY1;

	// check the square.
	wtu.checkCanvasRect(gl, deviceX1, deviceY1, squareWidth, squareHeight, green, "should be green");
	// check outside the square.
	wtu.checkCanvasRect(gl, 0, 0, width, height - squareHeight, black, "should be black");
	wtu.checkCanvasRect(gl, 0, height - squareHeight, width - squareWidth, squareHeight, black, "should be black");
	}


	function test(desiredWidth, desiredHeight) {
	debug("");
	debug("testing canvas width = " + desiredWidth + ", height = " + desiredHeight);

	// Make a fresh canvas.
	canvas = document.createElement("canvas");
	canvas.width = desiredWidth;
	canvas.height = desiredHeight;

	// This 'gl' must be global for shouldBe to work.
	gl = wtu.create3DContext(canvas, {antialias: false});
	if (!gl) {
	testFailed("context does not exist");
	} else {
	testPassed("context exists");

	// Check the dimensions are correct.
	checkDimensions();

	// Draw a pixel grid using a shader that draws in device coordinates
	checkGrid(gl, desiredWidth, desiredHeight);

	// Draw a quad in the top right corner.
	checkQuad(gl, desiredWidth, desiredHeight);

	shouldBe('gl.getError()', 'gl.NO_ERROR');

	debug("");
	debug("testing resizing canvas to width = " + desiredWidth + ", height = " + desiredHeight);

	var oldViewport = gl.getParameter(gl.VIEWPORT);

	// flip width and height
	canvas.width = desiredHeight;
	canvas.height = desiredWidth;

	// fix the viewport
	gl.viewport(0, 0, desiredHeight, desiredWidth);

	// Check the dimensions are correct.
	checkDimensions();

	// Draw a pixel grid using a shader that draws in device coordinates
	checkGrid(gl, desiredHeight, desiredWidth);

	// Draw a quad in the top right corner.
	checkQuad(gl, desiredHeight, desiredWidth);

	shouldBe('gl.getError()', 'gl.NO_ERROR');
	}
	}

	var wtu = WebGLTestUtils;

	// test a few sizes
	test(32, 16);
	test(128, 64);
	test(256, 512);

	debug("")
	var successfullyParsed = true;
	</script>
	<script src="../../resources/js-test-post.js"></script>
	</body>
	</html>