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texturesamplers.html
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texturesamplers.html
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<!--
Copyright 2009, Google Inc.
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above
copyright notice, this list of conditions and the following disclaimer
in the documentation and/or other materials provided with the
distribution.
* Neither the name of Google Inc. nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-->
<!--
O3D Texture Samplers example.
Demonstrates how to create samplers and set their various states.
-->
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<title>
Texture Samplers
</title>
<script type="text/javascript" src="../o3d-webgl/base.js"></script>
<script type="text/javascript" src="../o3djs/base.js"></script>
<script type="text/javascript" id="o3dscript">
o3djs.base.o3d = o3d;
o3djs.require('o3djs.webgl');
o3djs.require('o3djs.util');
o3djs.require('o3djs.math');
o3djs.require('o3djs.rendergraph');
o3djs.require('o3djs.primitives');
o3djs.require('o3djs.material');
o3djs.require('o3djs.event');
o3djs.require('o3djs.io');
// Events
// Run the init() once the page has finished loading.
window.onload = init;
// global variables
var g_o3d;
var g_math;
var g_client;
var g_pack;
var g_viewInfo;
var g_eye;
var g_target;
var g_up;
var g_finished = false; // for selenium testing
function scrollMe(e) {
g_eye = g_math.mulScalarVector((e.deltaY < 0 ? 11 : 13) / 12, g_eye);
g_viewInfo.drawContext.view = g_math.matrix4.lookAt(g_eye, g_target, g_up);
}
/**
* Creates the client area.
*/
function init() {
o3djs.webgl.makeClients(initStep2);
}
/**
* Initializes O3D, loads the effect, and draws the quads.
* @param {Array} clientElements Array of o3d object elements.
*/
function initStep2(clientElements) {
// Initialize global variables and libraries.
var o3dElement = clientElements[0];
g_o3d = o3dElement.o3d;
g_math = o3djs.math;
g_client = o3dElement.client;
// Create a pack to manage our resources/assets
g_pack = g_client.createPack();
// Create the render graph for a view.
g_viewInfo = o3djs.rendergraph.createBasicView(
g_pack,
g_client.root,
g_client.renderGraphRoot);
// Create our projection matrix, with a vertical field of view of 45 degrees
// a near clipping plane of 0.1 and far clipping plane of 100.
var proj_matrix = g_math.matrix4.perspective(
g_math.degToRad(45),
g_client.width / g_client.height,
0.1,
100);
// Create the view matrix which tells the camera which way to point to.
g_eye = [0, 4, 0];
g_target = [0, 0, 0];
g_up = [0, 0, -1];
var view_matrix = g_math.matrix4.lookAt(g_eye, g_target, g_up);
g_viewInfo.drawContext.view = view_matrix;
g_viewInfo.drawContext.projection = proj_matrix;
var samplers = [];
var transforms = [];
for (var xx = 0; xx < 3; xx++) {
for (var yy = 0; yy < 2; yy++) {
var index = yy * 3 + xx;
//Create effect for shaders.
var effect = g_pack.createObject('Effect');
var vertexShaderString = document.getElementById('vshader').value;
var pixelShaderString = document.getElementById('pshader').value;
effect.loadVertexShaderFromString(vertexShaderString);
effect.loadPixelShaderFromString(pixelShaderString);
// Create a new Material for the quad.
var material = g_pack.createObject('Material');
material.drawList = g_viewInfo.performanceDrawList;
material.effect = effect;
effect.createUniformParameters(material);
// Create a quad and position it.
var verts = o3djs.primitives.createPlaneVertices(1, 1, 1, 1);
var texCoordStream = verts.findStream(g_o3d.Stream.TEXCOORD, 0);
// make the UVs go from 0 to 2 instead of 0 to 1
for (var v = 0; v < texCoordStream.elements.length; ++v) {
texCoordStream.elements[v] *= 2;
}
var shape = verts.createShape(g_pack, material);
// Make a transform for each quad.
var transform = g_pack.createObject('Transform');
transform.translate([(xx - 1) * 1.2, 0, (0.5 - yy) * -1.2]);
transform.addShape(shape);
// Get the sampler on the sampler param.
var sampler = g_pack.createObject('Sampler');
samplers[index] = sampler;
transforms[index] = transform;
material.getParam('texSampler').value = sampler;
}
}
// Set the sampler states on each sampler.
// Looking at the generated image, the samplers correspond to the
// following quads:
// [0] [1] [2]
// [3] [4] [5]
// Sampler states not specified assume their default values which are:
// addressModeU = Sampler.WRAP
// addressModeV = Sampler.WRAP
// minFilter = Sampler.LINEAR
// magFilter = Sampler.LINEAR
// mipFilter = Sampler.POINT
// borderColor = Float4(0, 0, 0, 0)
// maxAnisotropy = 1
// Rotates quad and uses anisotropic filtering.
transforms[1].rotateZ(-Math.PI / 2.5);
samplers[1].addressModeU = g_o3d.Sampler.WRAP;
samplers[1].addressModeV = g_o3d.Sampler.WRAP;
samplers[1].minFilter = g_o3d.Sampler.ANISOTROPIC;
samplers[1].maxAnisotropy = 4;
// Note: BORDER addressing is not supported in WebGL.
//samplers[2].addressModeU = g_o3d.Sampler.BORDER;
//samplers[2].addressModeV = g_o3d.Sampler.BORDER;
//samplers[2].borderColor = [1, 0, 0, 1];
// Uses POINT sampling for minification.
samplers[3].addressModeU = g_o3d.Sampler.WRAP;
samplers[3].addressModeV = g_o3d.Sampler.WRAP;
samplers[3].minFilter = g_o3d.Sampler.POINT;
// Rotates quad and uses default (linear) filtering.
// Compare results to quad #1.
transforms[4].rotateZ(-Math.PI / 2.5);
samplers[4].addressModeU = g_o3d.Sampler.WRAP;
samplers[4].addressModeV = g_o3d.Sampler.WRAP;
samplers[4].minFilter = g_o3d.Sampler.LINEAR;
samplers[4].magFilter = g_o3d.Sampler.LINEAR;
// Uses MIRROR addressing mode to mirror the texture on both axes.
samplers[5].addressModeU = g_o3d.Sampler.MIRROR;
samplers[5].addressModeV = g_o3d.Sampler.MIRROR;
// Load our texture!
var url = o3djs.util.getCurrentURI() + '../assets/texture_b3.jpg';
o3djs.io.loadTexture(g_pack, url, function(texture, exception) {
if (exception) {
alert(exception);
} else {
// Use the same texture for all the samplers.
for (var ii = 0; ii < samplers.length; ii++) {
samplers[ii].texture = texture;
}
// Parent the transforms. We do this here because until the texture
// is loaded our quads are not ready to display.
for (var ii = 0; ii < transforms.length; ii++) {
transforms[ii].parent = g_client.root;
}
g_finished = true; // for selenium testing.
}
});
o3djs.event.addEventListener(o3dElement, 'wheel', scrollMe);
}
</script>
</head>
<body>
<h1>Texture Sampler Example</h1>
This tutorial demonstrates various texture sampler settings.
<br/>
<!-- Start of O3D plugin -->
<div id="o3d" style="width: 700px; height: 600px"></div>
<p>Scrollwheel To Zoom</p><br/>
<!-- End of O3D plugin -->
<textarea id="vshader" style="display: none;">
uniform mat4 worldViewProjection;
// input parameters for our vertex shader
attribute vec4 position;
attribute vec2 texCoord0;
// input parameters for our pixel shader
varying vec2 texCoord;
/**
* Our vertex shader
*/
void main() {
gl_Position = worldViewProjection * position;
texCoord = texCoord0;
}
</textarea>
<textarea id="pshader" style="display: none;">
varying vec2 texCoord;
uniform sampler2D texSampler;
/* Given the texture coordinates, our pixel shader grabs the corresponding
* color from the texture.
*/
void main() {
gl_FragColor = texture2D(texSampler, texCoord);
}
</textarea>
</body>
</html>