LayoutTests/fast/canvas/webgl/read-pixels-test.html - WebKit - Git at Google

 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
   "http://www.w3.org/TR/html4/loose.dtd">
 <html>
 <head>
 <title>WebGL ReadPixels conformance test.</title>
 <script src="../../../resources/js-test.js"></script>
 <script src="resources/webgl-test.js"> </script>
 <script src="resources/webgl-test-utils.js"> </script>
 </head>
 <body>
 <canvas id="example" width="200" height="200" style="width: 20px; height: 20px"></canvas>
 <div id="description"></div>
 <div id="console"></div>
 <script>
 description("Checks that ReadPixels works as expected.");

 if (window.internals)
     window.internals.settings.setWebGLErrorsToConsoleEnabled(false);

 var wtu = WebGLTestUtils;
 var canvas = document.getElementById("example");
 var gl = create3DContext(canvas);

 if (window.initNonKhronosFramework) {
    window.initNonKhronosFramework(true);
 }

 var actual;
 var expected;
 var width = 2;
 var height = 2;
 var continueTestFunc = continueTestPart1;

 gl.clearColor(1, 1, 1, 1);
 gl.clear(gl.COLOR_BUFFER_BIT);

 // Resize the canvas to 2x2. This is an attempt to get stuff in the backbuffer.
 // that shouldn't be there.
 canvas.addEventListener("webglcontextrestored", continueTestAfterContextRestored, false);
 canvas.width = width;
 canvas.height = height;
 if (gl.getError() != gl.CONTEXT_LOST_WEBGL) {
   continueTestPart1();
 }

 function continueTestAfterContextRestored() {
   window.gl = create3DContext(canvas);
   var func = continueTestFunc;
   window.continueTestFunc = function() { testFailed("should not be here"); };
   func();
 }

 function continueTestPart1() {
   gl.clearColor(0.5, 0.7, 1.0, 1);
   gl.clear(gl.COLOR_BUFFER_BIT);

   var innerColor = [0.5, 0.7, 1.0, 1];
   var outerColor = [0, 0, 0, 0];

   var tests = [
     { msg: 'in range', checkColor: innerColor, x:  0, y:  0,
       oneColor: innerColor, oneX: 0, oneY: 0},
     { msg: 'off top left', checkColor: outerColor, x: -1, y: -1,
       oneColor: innerColor, oneX: 1, oneY: 1},
     { msg: 'off bottom right', checkColor: outerColor, x:  1, y:  1,
       oneColor: innerColor, oneX: 0, oneY: 0},
     { msg: 'completely off top ', checkColor: outerColor, x:  0, y: -2,
       oneColor: outerColor, oneX: 0, oneY: 0},
     { msg: 'completely off bottom', checkColor: outerColor, x:  0, y:  2,
       oneColor: outerColor, oneX: 0, oneY: 0},
     { msg: 'completely off left', checkColor: outerColor, x: -2, y:  0,
       oneColor: outerColor, oneX: 0, oneY: 0},
     { msg: 'completeley off right', checkColor: outerColor, x:  2, y:  0,
       oneColor: outerColor, oneX: 0, oneY: 0}
   ];

   for (var tt = 0; tt < tests.length; ++tt) {
     var test = tests[tt];
     debug("");
     debug("checking: " + test.msg);
     checkBuffer(test.checkColor, test.x, test.y,
                 test.oneColor, test.oneX, test.oneY);
   }

   glErrorShouldBe(gl, gl.NO_ERROR, "there should be no GL errors");

   function checkBuffer(checkColor, x, y, oneColor, oneX, oneY) {
     var buf = new Uint8Array(width * height * 4);
     gl.readPixels(x, y, width, height, gl.RGBA, gl.UNSIGNED_BYTE, buf);
     for (var yy = 0; yy < height; ++yy) {
       for (var xx = 0; xx < width; ++xx) {
         var offset = (yy * width + xx) * 4;
         var expectedColors = (oneX == xx && oneY == yy) ? oneColor : checkColor;
         for (var cc = 0; cc < 4; ++cc) {
           var expectedColor = expectedColors[cc] * 255;
           var color = buf[offset + cc];
           var diff = Math.abs(expectedColor - color);
           assertMsg(diff < 3,
                     "color pixel at " + xx + ", " + yy + " should be about " + expectedColor);
         }
       }
     }
   }

   var badFormats = [
     {
       format: gl.RGB,
       type: gl.UNSIGNED_BYTE,
       dest: new Uint8Array(3),
       error: gl.INVALID_OPERATION
     },
     {
       format: gl.RGB,
       type: gl.UNSIGNED_SHORT_5_6_5,
       dest: new Uint8Array(3),
       error: gl.INVALID_OPERATION
     },
     {
       format: gl.RGBA,
       type: gl.UNSIGNED_SHORT_5_5_5_1,
       dest: new Uint16Array(1),
       error: gl.INVALID_OPERATION
     },
     {
       format: gl.RGBA,
       type: gl.UNSIGNED_SHORT_4_4_4_4,
       dest: new Uint16Array(1),
       error: gl.INVALID_OPERATION
     },
     {
       format: gl.ALPHA,
       type: gl.UNSIGNED_BYTE,
       dest: new Uint8Array(1),
       error: gl.INVALID_OPERATION
     },
     {
       format: gl.LUMINANCE,
       type: gl.UNSIGNED_BYTE,
       dest: new Uint8Array(1),
       error: gl.INVALID_ENUM
     },
     {
       format: gl.LUMINANCE_ALPHA,
       type: gl.UNSIGNED_BYTE,
       dest: new Uint8Array(2),
       error: gl.INVALID_ENUM
     }
   ];
   debug("");
   debug("check disallowed formats");
   for (var tt = 0; tt < badFormats.length; ++ tt) {
     var info = badFormats[tt]
     var format = info.format;
     var type = info.type;
     var dest = info.dest;
     var error = info.error;
     gl.readPixels(0, 0, 1, 1, format, type, dest);
     // note that the GL error is INVALID_OPERATION if both format and type are invalid, but
     // INVALID_ENUM if only one is.
     glErrorShouldBe(
         gl, error,
         "Should not be able to read as " + wtu.glEnumToString(gl, format) +
         " / " + wtu.glEnumToString(gl, type));
   }

   debug("");
   debug("check reading with lots of drawing");
   continueTestFunc = continueTestPart2;
   width = 1024;
   height = 1024;
   canvas.width = width;
   canvas.height = height;
   if (gl.getError() != gl.CONTEXT_LOST_WEBGL) {
     continueTestPart2();
   }
 }

 function continueTestPart2() {
   gl.viewport(0, 0, 1024, 1024);
   var program = wtu.setupTexturedQuad(gl);
   var loc = gl.getUniformLocation(program, "tex");
   gl.disable(gl.BLEND);
   gl.disable(gl.DEPTH_TEST);
   var colors = [[255, 0, 0, 255], [0, 255, 0, 255], [0, 0, 255, 255]];
   var textures = [];
   var results = [];
   for (var ii = 0; ii < colors.length; ++ii) {
     gl.activeTexture(gl.TEXTURE0 + ii);
     var tex = gl.createTexture();
     wtu.fillTexture(gl, tex, 1, 1, colors[ii]);
     textures.push(tex);
   }
   for (var ii = 0; ii < colors.length; ++ii) {
     for (var jj = 0; jj < 300 + ii + 1; ++jj) {
       gl.uniform1i(loc, jj % 3);
       gl.drawArrays(gl.TRIANGLES, 0, 6);
     }
     var buf = new Uint8Array(4);
     gl.readPixels(512, 512, 1, 1, gl.RGBA, gl.UNSIGNED_BYTE, buf);
     results.push(buf);
     for (var kk = 0; kk < 99; ++kk) {
       gl.uniform1i(loc, (jj + kk) % 3);
       gl.drawArrays(gl.TRIANGLES, 0, 6);
     }
   }
   for (var ii = 0; ii < colors.length; ++ii) {
     var buf = results[ii];
     var color = colors[ii];
     actual = [buf[0], buf[1], buf[2], buf[3]];
     expected = [color[0], color[1], color[2], color[3]];
     shouldBe("actual", "expected");
   }
   glErrorShouldBe(gl, gl.NO_ERROR, "there should be no GL errors");

   debug("");
   finishTest();
 }
 </script>
 </body>
 </html>
	<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
	"http://www.w3.org/TR/html4/loose.dtd">
	<html>
	<head>
	<title>WebGL ReadPixels conformance test.</title>
	<script src="../../../resources/js-test.js"></script>
	<script src="resources/webgl-test.js"> </script>
	<script src="resources/webgl-test-utils.js"> </script>
	</head>
	<body>
	<canvas id="example" width="200" height="200" style="width: 20px; height: 20px"></canvas>
	<div id="description"></div>
	<div id="console"></div>
	<script>
	description("Checks that ReadPixels works as expected.");

	if (window.internals)
	window.internals.settings.setWebGLErrorsToConsoleEnabled(false);

	var wtu = WebGLTestUtils;
	var canvas = document.getElementById("example");
	var gl = create3DContext(canvas);

	if (window.initNonKhronosFramework) {
	window.initNonKhronosFramework(true);
	}

	var actual;
	var expected;
	var width = 2;
	var height = 2;
	var continueTestFunc = continueTestPart1;

	gl.clearColor(1, 1, 1, 1);
	gl.clear(gl.COLOR_BUFFER_BIT);

	// Resize the canvas to 2x2. This is an attempt to get stuff in the backbuffer.
	// that shouldn't be there.
	canvas.addEventListener("webglcontextrestored", continueTestAfterContextRestored, false);
	canvas.width = width;
	canvas.height = height;
	if (gl.getError() != gl.CONTEXT_LOST_WEBGL) {
	continueTestPart1();
	}

	function continueTestAfterContextRestored() {
	window.gl = create3DContext(canvas);
	var func = continueTestFunc;
	window.continueTestFunc = function() { testFailed("should not be here"); };
	func();
	}

	function continueTestPart1() {
	gl.clearColor(0.5, 0.7, 1.0, 1);
	gl.clear(gl.COLOR_BUFFER_BIT);

	var innerColor = [0.5, 0.7, 1.0, 1];
	var outerColor = [0, 0, 0, 0];

	var tests = [
	{ msg: 'in range', checkColor: innerColor, x: 0, y: 0,
	oneColor: innerColor, oneX: 0, oneY: 0},
	{ msg: 'off top left', checkColor: outerColor, x: -1, y: -1,
	oneColor: innerColor, oneX: 1, oneY: 1},
	{ msg: 'off bottom right', checkColor: outerColor, x: 1, y: 1,
	oneColor: innerColor, oneX: 0, oneY: 0},
	{ msg: 'completely off top ', checkColor: outerColor, x: 0, y: -2,
	oneColor: outerColor, oneX: 0, oneY: 0},
	{ msg: 'completely off bottom', checkColor: outerColor, x: 0, y: 2,
	oneColor: outerColor, oneX: 0, oneY: 0},
	{ msg: 'completely off left', checkColor: outerColor, x: -2, y: 0,
	oneColor: outerColor, oneX: 0, oneY: 0},
	{ msg: 'completeley off right', checkColor: outerColor, x: 2, y: 0,
	oneColor: outerColor, oneX: 0, oneY: 0}
	];

	for (var tt = 0; tt < tests.length; ++tt) {
	var test = tests[tt];
	debug("");
	debug("checking: " + test.msg);
	checkBuffer(test.checkColor, test.x, test.y,
	test.oneColor, test.oneX, test.oneY);
	}

	glErrorShouldBe(gl, gl.NO_ERROR, "there should be no GL errors");

	function checkBuffer(checkColor, x, y, oneColor, oneX, oneY) {
	var buf = new Uint8Array(width * height * 4);
	gl.readPixels(x, y, width, height, gl.RGBA, gl.UNSIGNED_BYTE, buf);
	for (var yy = 0; yy < height; ++yy) {
	for (var xx = 0; xx < width; ++xx) {
	var offset = (yy * width + xx) * 4;
	var expectedColors = (oneX == xx && oneY == yy) ? oneColor : checkColor;
	for (var cc = 0; cc < 4; ++cc) {
	var expectedColor = expectedColors[cc] * 255;
	var color = buf[offset + cc];
	var diff = Math.abs(expectedColor - color);
	assertMsg(diff < 3,
	"color pixel at " + xx + ", " + yy + " should be about " + expectedColor);
	}
	}
	}
	}

	var badFormats = [
	{
	format: gl.RGB,
	type: gl.UNSIGNED_BYTE,
	dest: new Uint8Array(3),
	error: gl.INVALID_OPERATION
	},
	{
	format: gl.RGB,
	type: gl.UNSIGNED_SHORT_5_6_5,
	dest: new Uint8Array(3),
	error: gl.INVALID_OPERATION
	},
	{
	format: gl.RGBA,
	type: gl.UNSIGNED_SHORT_5_5_5_1,
	dest: new Uint16Array(1),
	error: gl.INVALID_OPERATION
	},
	{
	format: gl.RGBA,
	type: gl.UNSIGNED_SHORT_4_4_4_4,
	dest: new Uint16Array(1),
	error: gl.INVALID_OPERATION
	},
	{
	format: gl.ALPHA,
	type: gl.UNSIGNED_BYTE,
	dest: new Uint8Array(1),
	error: gl.INVALID_OPERATION
	},
	{
	format: gl.LUMINANCE,
	type: gl.UNSIGNED_BYTE,
	dest: new Uint8Array(1),
	error: gl.INVALID_ENUM
	},
	{
	format: gl.LUMINANCE_ALPHA,
	type: gl.UNSIGNED_BYTE,
	dest: new Uint8Array(2),
	error: gl.INVALID_ENUM
	}
	];
	debug("");
	debug("check disallowed formats");
	for (var tt = 0; tt < badFormats.length; ++ tt) {
	var info = badFormats[tt]
	var format = info.format;
	var type = info.type;
	var dest = info.dest;
	var error = info.error;
	gl.readPixels(0, 0, 1, 1, format, type, dest);
	// note that the GL error is INVALID_OPERATION if both format and type are invalid, but
	// INVALID_ENUM if only one is.
	glErrorShouldBe(
	gl, error,
	"Should not be able to read as " + wtu.glEnumToString(gl, format) +
	" / " + wtu.glEnumToString(gl, type));
	}

	debug("");
	debug("check reading with lots of drawing");
	continueTestFunc = continueTestPart2;
	width = 1024;
	height = 1024;
	canvas.width = width;
	canvas.height = height;
	if (gl.getError() != gl.CONTEXT_LOST_WEBGL) {
	continueTestPart2();
	}
	}

	function continueTestPart2() {
	gl.viewport(0, 0, 1024, 1024);
	var program = wtu.setupTexturedQuad(gl);
	var loc = gl.getUniformLocation(program, "tex");
	gl.disable(gl.BLEND);
	gl.disable(gl.DEPTH_TEST);
	var colors = [[255, 0, 0, 255], [0, 255, 0, 255], [0, 0, 255, 255]];
	var textures = [];
	var results = [];
	for (var ii = 0; ii < colors.length; ++ii) {
	gl.activeTexture(gl.TEXTURE0 + ii);
	var tex = gl.createTexture();
	wtu.fillTexture(gl, tex, 1, 1, colors[ii]);
	textures.push(tex);
	}
	for (var ii = 0; ii < colors.length; ++ii) {
	for (var jj = 0; jj < 300 + ii + 1; ++jj) {
	gl.uniform1i(loc, jj % 3);
	gl.drawArrays(gl.TRIANGLES, 0, 6);
	}
	var buf = new Uint8Array(4);
	gl.readPixels(512, 512, 1, 1, gl.RGBA, gl.UNSIGNED_BYTE, buf);
	results.push(buf);
	for (var kk = 0; kk < 99; ++kk) {
	gl.uniform1i(loc, (jj + kk) % 3);
	gl.drawArrays(gl.TRIANGLES, 0, 6);
	}
	}
	for (var ii = 0; ii < colors.length; ++ii) {
	var buf = results[ii];
	var color = colors[ii];
	actual = [buf[0], buf[1], buf[2], buf[3]];
	expected = [color[0], color[1], color[2], color[3]];
	shouldBe("actual", "expected");
	}
	glErrorShouldBe(gl, gl.NO_ERROR, "there should be no GL errors");

	debug("");
	finishTest();
	}
	</script>
	</body>
	</html>