LayoutTests/fast/canvas/webgl/tex-sub-image-cube-maps.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 texture texSubImage2Ds cube map 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="256" height="256" style="width: 40px; height: 40px;"></canvas>
 <div id="description"></div>
 <div id="console"></div>
 <script id="vshader" type="x-shader/x-vertex">
 attribute vec4 vPosition;
 uniform mat4 rotation;
 varying vec3 texCoord;
 void main()
 {
     gl_Position = vPosition;
     vec4 direction = vec4(vPosition.x * 0.5, vPosition.y * 0.5, 1, 1);
     texCoord = normalize((rotation * direction).xyz);
 }
 </script>

 <script id="fshader" type="x-shader/x-fragment">
 precision mediump float;
 uniform samplerCube tex;
 varying vec3 texCoord;
 void main()
 {
     gl_FragColor = textureCube(tex, normalize(texCoord));
 }
 </script>
 <script>
 var canvas;
 description("Checks texSubImage2D with cube map textures");
 debug("");

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

 gl = wtu.create3DContext(canvas);
 wtu.setupUnitQuad(gl, 0, 1);
 var program = wtu.setupProgram(
     gl,
     ['vshader', 'fshader'],
     ['vPosition', 'texCoord0'], [0, 1]);
 var rotLoc = gl.getUniformLocation(program, "rotation");

 size = 16;

 var colors = [
   {name: 'red',     color: [255,   0,   0, 255]},
   {name: 'green',   color: [  0, 255,   0, 255]},
   {name: 'blue',    color: [  0,   0, 255, 255]},
   {name: 'yellow',  color: [255, 255,   0, 255]},
   {name: 'cyan',    color: [  0, 255, 255, 255]},
   {name: 'magenta', color: [255,   0, 255, 255]}
 ];

 var targets = [
   gl.TEXTURE_CUBE_MAP_POSITIVE_X,
   gl.TEXTURE_CUBE_MAP_NEGATIVE_X,
   gl.TEXTURE_CUBE_MAP_POSITIVE_Y,
   gl.TEXTURE_CUBE_MAP_NEGATIVE_Y,
   gl.TEXTURE_CUBE_MAP_POSITIVE_Z,
   gl.TEXTURE_CUBE_MAP_NEGATIVE_Z];

 var rotations = [
   {axis: [0, 1, 0], angle:  Math.PI / 2},
   {axis: [0, 1, 0], angle: -Math.PI / 2},
   {axis: [1, 0, 0], angle: -Math.PI / 2},
   {axis: [1, 0, 0], angle:  Math.PI / 2},
   {axis: [0, 1, 0], angle:  0},
   {axis: [0, 1, 0], angle:  Math.PI},
 ];

 var halfRotations = [
   {colors: [3, 4], rotations: [{axis: [1, 0, 0], angle:  Math.PI / 4}]},
   {colors: [4, 2], rotations: [{axis: [1, 0, 0], angle: -Math.PI / 4}]},
   {colors: [5, 3], rotations: [{axis: [1, 0, 0], angle:  Math.PI / 4 * 3}]},
   {colors: [2, 5], rotations: [{axis: [1, 0, 0], angle: -Math.PI / 4 * 3}]},
   {colors: [3, 0], rotations: [{axis: [0, 1, 0], angle:  Math.PI / 2},
                                {axis: [1, 0, 0], angle:  Math.PI / 4}]},
   {colors: [0, 2], rotations: [{axis: [0, 1, 0], angle:  Math.PI / 2},
                                {axis: [1, 0, 0], angle: -Math.PI / 4}]},
 ];

 var count = 0;
 testSize(size);

 function testSize(size) {
   debug("");
   debug("testing size: " + size);
   var canvasSize = Math.max(size / 4, 2);
   canvas.width = canvasSize;
   canvas.height = canvasSize;
   gl.viewport(0, 0, canvasSize, canvasSize);
   var tex = gl.createTexture();
   gl.bindTexture(gl.TEXTURE_CUBE_MAP, tex);

   // Seems like I should be using LINEAR here with some other math
   // to make sure I get more mip coverage but that's easier said
   // than done.

   gl.texParameteri(gl.TEXTURE_CUBE_MAP, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
   gl.texParameteri(gl.TEXTURE_CUBE_MAP, gl.TEXTURE_MAG_FILTER, gl.NEAREST);

   for (var jj = 0; jj < 2; ++jj) {
     for (var tt = 0; tt < targets.length; ++tt) {
       var color = colors[(tt + count) % colors.length];
       fillLevel(targets[tt], 0, size, color.color);
     }
     if (jj == 1) {
       debug("use mipmap");
       gl.texParameteri(
           gl.TEXTURE_CUBE_MAP, gl.TEXTURE_MIN_FILTER,
           gl.NEAREST_MIPMAP_NEAREST);
       gl.generateMipmap(gl.TEXTURE_CUBE_MAP);
     }

     var err = gl.getError();
     if (err == gl.OUT_OF_MEMORY) {
       debug("out of memory");
       return false;
     }
     if (err != gl.NO_ERROR) {
       testFailed("unexpected gl error: " + wtu.glEnumToString(gl, err));
     }


     for (var rr = 0; rr < rotations.length; ++rr) {
       var rot = rotations[rr];
       var color = colors[(rr + count) % colors.length];
       var rotMat = axisRotation(rot.axis, rot.angle);
       gl.uniformMatrix4fv(rotLoc, false, rotMat);
       wtu.drawQuad(gl);
       wtu.checkCanvas(
           gl, color.color,
           wtu.glEnumToString(gl, targets[rr]) + " should be " + color.name);
     }

     for (var rr = 0; rr < halfRotations.length; ++rr) {
       var h = halfRotations[rr];
       var rots = h.rotations;
       var rotMat = axisRotation(rots[0].axis, rots[0].angle);
       for (var ii = 1; ii < rots.length; ++ii) {
         var tmpMat = axisRotation(rots[ii].axis, rots[ii].angle);
         var rotMat = mulMatrix(tmpMat, rotMat);
       }
       gl.uniformMatrix4fv(rotLoc, false, rotMat);
       wtu.drawQuad(gl);

       for (var ii = 0; ii < 2; ++ii) {
         checkRect(
             0,
             canvasSize / 2 * ii,
             canvasSize,
             canvasSize / 2,
             colors[(h.colors[ii] + count) % colors.length]);
       }
     }
     ++count;
   }

   gl.deleteTexture(tex);
   return true;
 }

 glErrorShouldBe(gl, gl.NO_ERROR, "Should be no errors.");

 function checkRect(x, y, width, height, color) {
   wtu.checkCanvasRect(
        gl,
        x,
        y,
        width,
        height,
        color.color,
        "" + x + ", " + y + ", " + width + ", " + height +
        " should be " + color.name);
 }

 function fillLevel(target, level, size, color) {
   var numPixels = size * size;
   var halfPixelRow = new Uint8Array(size * 2);
   for (var jj = 0; jj < size; ++jj) {
     var off = jj * 4;
     halfPixelRow[off + 0] = color[0];
     halfPixelRow[off + 1] = color[1];
     halfPixelRow[off + 2] = color[2];
     halfPixelRow[off + 3] = color[3];
   }
   gl.texImage2D(
       target, level, gl.RGBA, size, size, 0, gl.RGBA, gl.UNSIGNED_BYTE,
       null);
   for (var jj = 0; jj < size; ++jj) {
 	  gl.texSubImage2D(
 		  target, level, 0, jj, size / 2, 1, gl.RGBA, gl.UNSIGNED_BYTE, halfPixelRow);
 	  gl.texSubImage2D(
 		  target, level, size / 2, jj, size / 2, 1, gl.RGBA, gl.UNSIGNED_BYTE, halfPixelRow);
   }
 }

 function printMat(mat) {
   debug("" + mat[0] + ", " + mat[1] + ", " + mat[2] + ", " + mat[3] + ", ");
   debug("" + mat[4] + ", " + mat[5] + ", " + mat[6] + ", " + mat[7] + ", ");
   debug("" + mat[8] + ", " + mat[9] + ", " + mat[10] + ", " + mat[11] + ", ");
   debug("" + mat[12] + ", " + mat[13] + ", " + mat[14] + ", " + mat[15] + ", ");
 }

 function axisRotation(axis, angle) {
   var dst = new Float32Array(16);
   var x = axis[0];
   var y = axis[1];
   var z = axis[2];
   var n = Math.sqrt(x * x + y * y + z * z);
   x /= n;
   y /= n;
   z /= n;
   var xx = x * x;
   var yy = y * y;
   var zz = z * z;
   var c = Math.cos(angle);
   var s = Math.sin(angle);
   var oneMinusCosine = 1 - c;

   dst[ 0] = xx + (1 - xx) * c;
   dst[ 1] = x * y * oneMinusCosine + z * s;
   dst[ 2] = x * z * oneMinusCosine - y * s;
   dst[ 3] = 0;
   dst[ 4] = x * y * oneMinusCosine - z * s;
   dst[ 5] = yy + (1 - yy) * c;
   dst[ 6] = y * z * oneMinusCosine + x * s;
   dst[ 7] = 0;
   dst[ 8] = x * z * oneMinusCosine + y * s;
   dst[ 9] = y * z * oneMinusCosine - x * s;
   dst[10] = zz + (1 - zz) * c;
   dst[11] = 0;
   dst[12] = 0;
   dst[13] = 0;
   dst[14] = 0;
   dst[15] = 1;

   return dst;
 };

 function mulMatrix(a, b) {
   var dst = new Float32Array(16);
   var a00 = a[0];
   var a01 = a[1];
   var a02 = a[2];
   var a03 = a[3];
   var a10 = a[ 4 + 0];
   var a11 = a[ 4 + 1];
   var a12 = a[ 4 + 2];
   var a13 = a[ 4 + 3];
   var a20 = a[ 8 + 0];
   var a21 = a[ 8 + 1];
   var a22 = a[ 8 + 2];
   var a23 = a[ 8 + 3];
   var a30 = a[12 + 0];
   var a31 = a[12 + 1];
   var a32 = a[12 + 2];
   var a33 = a[12 + 3];
   var b00 = b[0];
   var b01 = b[1];
   var b02 = b[2];
   var b03 = b[3];
   var b10 = b[ 4 + 0];
   var b11 = b[ 4 + 1];
   var b12 = b[ 4 + 2];
   var b13 = b[ 4 + 3];
   var b20 = b[ 8 + 0];
   var b21 = b[ 8 + 1];
   var b22 = b[ 8 + 2];
   var b23 = b[ 8 + 3];
   var b30 = b[12 + 0];
   var b31 = b[12 + 1];
   var b32 = b[12 + 2];
   var b33 = b[12 + 3];
   dst[ 0] = a00 * b00 + a01 * b10 + a02 * b20 + a03 * b30;
   dst[ 1] = a00 * b01 + a01 * b11 + a02 * b21 + a03 * b31;
   dst[ 2] = a00 * b02 + a01 * b12 + a02 * b22 + a03 * b32;
   dst[ 3] = a00 * b03 + a01 * b13 + a02 * b23 + a03 * b33;
   dst[ 4] = a10 * b00 + a11 * b10 + a12 * b20 + a13 * b30;
   dst[ 5] = a10 * b01 + a11 * b11 + a12 * b21 + a13 * b31;
   dst[ 6] = a10 * b02 + a11 * b12 + a12 * b22 + a13 * b32;
   dst[ 7] = a10 * b03 + a11 * b13 + a12 * b23 + a13 * b33;
   dst[ 8] = a20 * b00 + a21 * b10 + a22 * b20 + a23 * b30;
   dst[ 9] = a20 * b01 + a21 * b11 + a22 * b21 + a23 * b31;
   dst[10] = a20 * b02 + a21 * b12 + a22 * b22 + a23 * b32;
   dst[11] = a20 * b03 + a21 * b13 + a22 * b23 + a23 * b33;
   dst[12] = a30 * b00 + a31 * b10 + a32 * b20 + a33 * b30;
   dst[13] = a30 * b01 + a31 * b11 + a32 * b21 + a33 * b31;
   dst[14] = a30 * b02 + a31 * b12 + a32 * b22 + a33 * b32;
   dst[15] = a30 * b03 + a31 * b13 + a32 * b23 + a33 * b33;
   return dst;
 };
 </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 texture texSubImage2Ds cube map 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="256" height="256" style="width: 40px; height: 40px;"></canvas>
	<div id="description"></div>
	<div id="console"></div>
	<script id="vshader" type="x-shader/x-vertex">
	attribute vec4 vPosition;
	uniform mat4 rotation;
	varying vec3 texCoord;
	void main()
	{
	gl_Position = vPosition;
	vec4 direction = vec4(vPosition.x * 0.5, vPosition.y * 0.5, 1, 1);
	texCoord = normalize((rotation * direction).xyz);
	}
	</script>

	<script id="fshader" type="x-shader/x-fragment">
	precision mediump float;
	uniform samplerCube tex;
	varying vec3 texCoord;
	void main()
	{
	gl_FragColor = textureCube(tex, normalize(texCoord));
	}
	</script>
	<script>
	var canvas;
	description("Checks texSubImage2D with cube map textures");
	debug("");

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

	gl = wtu.create3DContext(canvas);
	wtu.setupUnitQuad(gl, 0, 1);
	var program = wtu.setupProgram(
	gl,
	['vshader', 'fshader'],
	['vPosition', 'texCoord0'], [0, 1]);
	var rotLoc = gl.getUniformLocation(program, "rotation");

	size = 16;

	var colors = [
	{name: 'red', color: [255, 0, 0, 255]},
	{name: 'green', color: [ 0, 255, 0, 255]},
	{name: 'blue', color: [ 0, 0, 255, 255]},
	{name: 'yellow', color: [255, 255, 0, 255]},
	{name: 'cyan', color: [ 0, 255, 255, 255]},
	{name: 'magenta', color: [255, 0, 255, 255]}
	];

	var targets = [
	gl.TEXTURE_CUBE_MAP_POSITIVE_X,
	gl.TEXTURE_CUBE_MAP_NEGATIVE_X,
	gl.TEXTURE_CUBE_MAP_POSITIVE_Y,
	gl.TEXTURE_CUBE_MAP_NEGATIVE_Y,
	gl.TEXTURE_CUBE_MAP_POSITIVE_Z,
	gl.TEXTURE_CUBE_MAP_NEGATIVE_Z];

	var rotations = [
	{axis: [0, 1, 0], angle: Math.PI / 2},
	{axis: [0, 1, 0], angle: -Math.PI / 2},
	{axis: [1, 0, 0], angle: -Math.PI / 2},
	{axis: [1, 0, 0], angle: Math.PI / 2},
	{axis: [0, 1, 0], angle: 0},
	{axis: [0, 1, 0], angle: Math.PI},
	];

	var halfRotations = [
	{colors: [3, 4], rotations: [{axis: [1, 0, 0], angle: Math.PI / 4}]},
	{colors: [4, 2], rotations: [{axis: [1, 0, 0], angle: -Math.PI / 4}]},
	{colors: [5, 3], rotations: [{axis: [1, 0, 0], angle: Math.PI / 4 * 3}]},
	{colors: [2, 5], rotations: [{axis: [1, 0, 0], angle: -Math.PI / 4 * 3}]},
	{colors: [3, 0], rotations: [{axis: [0, 1, 0], angle: Math.PI / 2},
	{axis: [1, 0, 0], angle: Math.PI / 4}]},
	{colors: [0, 2], rotations: [{axis: [0, 1, 0], angle: Math.PI / 2},
	{axis: [1, 0, 0], angle: -Math.PI / 4}]},
	];

	var count = 0;
	testSize(size);

	function testSize(size) {
	debug("");
	debug("testing size: " + size);
	var canvasSize = Math.max(size / 4, 2);
	canvas.width = canvasSize;
	canvas.height = canvasSize;
	gl.viewport(0, 0, canvasSize, canvasSize);
	var tex = gl.createTexture();
	gl.bindTexture(gl.TEXTURE_CUBE_MAP, tex);

	// Seems like I should be using LINEAR here with some other math
	// to make sure I get more mip coverage but that's easier said
	// than done.

	gl.texParameteri(gl.TEXTURE_CUBE_MAP, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
	gl.texParameteri(gl.TEXTURE_CUBE_MAP, gl.TEXTURE_MAG_FILTER, gl.NEAREST);

	for (var jj = 0; jj < 2; ++jj) {
	for (var tt = 0; tt < targets.length; ++tt) {
	var color = colors[(tt + count) % colors.length];
	fillLevel(targets[tt], 0, size, color.color);
	}
	if (jj == 1) {
	debug("use mipmap");
	gl.texParameteri(
	gl.TEXTURE_CUBE_MAP, gl.TEXTURE_MIN_FILTER,
	gl.NEAREST_MIPMAP_NEAREST);
	gl.generateMipmap(gl.TEXTURE_CUBE_MAP);
	}

	var err = gl.getError();
	if (err == gl.OUT_OF_MEMORY) {
	debug("out of memory");
	return false;
	}
	if (err != gl.NO_ERROR) {
	testFailed("unexpected gl error: " + wtu.glEnumToString(gl, err));
	}


	for (var rr = 0; rr < rotations.length; ++rr) {
	var rot = rotations[rr];
	var color = colors[(rr + count) % colors.length];
	var rotMat = axisRotation(rot.axis, rot.angle);
	gl.uniformMatrix4fv(rotLoc, false, rotMat);
	wtu.drawQuad(gl);
	wtu.checkCanvas(
	gl, color.color,
	wtu.glEnumToString(gl, targets[rr]) + " should be " + color.name);
	}

	for (var rr = 0; rr < halfRotations.length; ++rr) {
	var h = halfRotations[rr];
	var rots = h.rotations;
	var rotMat = axisRotation(rots[0].axis, rots[0].angle);
	for (var ii = 1; ii < rots.length; ++ii) {
	var tmpMat = axisRotation(rots[ii].axis, rots[ii].angle);
	var rotMat = mulMatrix(tmpMat, rotMat);
	}
	gl.uniformMatrix4fv(rotLoc, false, rotMat);
	wtu.drawQuad(gl);

	for (var ii = 0; ii < 2; ++ii) {
	checkRect(
	0,
	canvasSize / 2 * ii,
	canvasSize,
	canvasSize / 2,
	colors[(h.colors[ii] + count) % colors.length]);
	}
	}
	++count;
	}

	gl.deleteTexture(tex);
	return true;
	}

	glErrorShouldBe(gl, gl.NO_ERROR, "Should be no errors.");

	function checkRect(x, y, width, height, color) {
	wtu.checkCanvasRect(
	gl,
	x,
	y,
	width,
	height,
	color.color,
	"" + x + ", " + y + ", " + width + ", " + height +
	" should be " + color.name);
	}

	function fillLevel(target, level, size, color) {
	var numPixels = size * size;
	var halfPixelRow = new Uint8Array(size * 2);
	for (var jj = 0; jj < size; ++jj) {
	var off = jj * 4;
	halfPixelRow[off + 0] = color[0];
	halfPixelRow[off + 1] = color[1];
	halfPixelRow[off + 2] = color[2];
	halfPixelRow[off + 3] = color[3];
	}
	gl.texImage2D(
	target, level, gl.RGBA, size, size, 0, gl.RGBA, gl.UNSIGNED_BYTE,
	null);
	for (var jj = 0; jj < size; ++jj) {
	gl.texSubImage2D(
	target, level, 0, jj, size / 2, 1, gl.RGBA, gl.UNSIGNED_BYTE, halfPixelRow);
	gl.texSubImage2D(
	target, level, size / 2, jj, size / 2, 1, gl.RGBA, gl.UNSIGNED_BYTE, halfPixelRow);
	}
	}

	function printMat(mat) {
	debug("" + mat[0] + ", " + mat[1] + ", " + mat[2] + ", " + mat[3] + ", ");
	debug("" + mat[4] + ", " + mat[5] + ", " + mat[6] + ", " + mat[7] + ", ");
	debug("" + mat[8] + ", " + mat[9] + ", " + mat[10] + ", " + mat[11] + ", ");
	debug("" + mat[12] + ", " + mat[13] + ", " + mat[14] + ", " + mat[15] + ", ");
	}

	function axisRotation(axis, angle) {
	var dst = new Float32Array(16);
	var x = axis[0];
	var y = axis[1];
	var z = axis[2];
	var n = Math.sqrt(x * x + y * y + z * z);
	x /= n;
	y /= n;
	z /= n;
	var xx = x * x;
	var yy = y * y;
	var zz = z * z;
	var c = Math.cos(angle);
	var s = Math.sin(angle);
	var oneMinusCosine = 1 - c;

	dst[ 0] = xx + (1 - xx) * c;
	dst[ 1] = x * y * oneMinusCosine + z * s;
	dst[ 2] = x * z * oneMinusCosine - y * s;
	dst[ 3] = 0;
	dst[ 4] = x * y * oneMinusCosine - z * s;
	dst[ 5] = yy + (1 - yy) * c;
	dst[ 6] = y * z * oneMinusCosine + x * s;
	dst[ 7] = 0;
	dst[ 8] = x * z * oneMinusCosine + y * s;
	dst[ 9] = y * z * oneMinusCosine - x * s;
	dst[10] = zz + (1 - zz) * c;
	dst[11] = 0;
	dst[12] = 0;
	dst[13] = 0;
	dst[14] = 0;
	dst[15] = 1;

	return dst;
	};

	function mulMatrix(a, b) {
	var dst = new Float32Array(16);
	var a00 = a[0];
	var a01 = a[1];
	var a02 = a[2];
	var a03 = a[3];
	var a10 = a[ 4 + 0];
	var a11 = a[ 4 + 1];
	var a12 = a[ 4 + 2];
	var a13 = a[ 4 + 3];
	var a20 = a[ 8 + 0];
	var a21 = a[ 8 + 1];
	var a22 = a[ 8 + 2];
	var a23 = a[ 8 + 3];
	var a30 = a[12 + 0];
	var a31 = a[12 + 1];
	var a32 = a[12 + 2];
	var a33 = a[12 + 3];
	var b00 = b[0];
	var b01 = b[1];
	var b02 = b[2];
	var b03 = b[3];
	var b10 = b[ 4 + 0];
	var b11 = b[ 4 + 1];
	var b12 = b[ 4 + 2];
	var b13 = b[ 4 + 3];
	var b20 = b[ 8 + 0];
	var b21 = b[ 8 + 1];
	var b22 = b[ 8 + 2];
	var b23 = b[ 8 + 3];
	var b30 = b[12 + 0];
	var b31 = b[12 + 1];
	var b32 = b[12 + 2];
	var b33 = b[12 + 3];
	dst[ 0] = a00 * b00 + a01 * b10 + a02 * b20 + a03 * b30;
	dst[ 1] = a00 * b01 + a01 * b11 + a02 * b21 + a03 * b31;
	dst[ 2] = a00 * b02 + a01 * b12 + a02 * b22 + a03 * b32;
	dst[ 3] = a00 * b03 + a01 * b13 + a02 * b23 + a03 * b33;
	dst[ 4] = a10 * b00 + a11 * b10 + a12 * b20 + a13 * b30;
	dst[ 5] = a10 * b01 + a11 * b11 + a12 * b21 + a13 * b31;
	dst[ 6] = a10 * b02 + a11 * b12 + a12 * b22 + a13 * b32;
	dst[ 7] = a10 * b03 + a11 * b13 + a12 * b23 + a13 * b33;
	dst[ 8] = a20 * b00 + a21 * b10 + a22 * b20 + a23 * b30;
	dst[ 9] = a20 * b01 + a21 * b11 + a22 * b21 + a23 * b31;
	dst[10] = a20 * b02 + a21 * b12 + a22 * b22 + a23 * b32;
	dst[11] = a20 * b03 + a21 * b13 + a22 * b23 + a23 * b33;
	dst[12] = a30 * b00 + a31 * b10 + a32 * b20 + a33 * b30;
	dst[13] = a30 * b01 + a31 * b11 + a32 * b21 + a33 * b31;
	dst[14] = a30 * b02 + a31 * b12 + a32 * b22 + a33 * b32;
	dst[15] = a30 * b03 + a31 * b13 + a32 * b23 + a33 * b33;
	return dst;
	};
	</script>
	</body>
	</html>