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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-->
<!--
In this tutorial, we show how to create bitmaps and how to draw
images on both bitmaps and textures.
-->
<!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>
Bitmap Draw Image Demo
</title>
<script type="text/javascript" src="o3djs/base.js"></script>
<script type="text/javascript" id="o3dscript">
o3djs.require('o3djs.util');
o3djs.require('o3djs.math');
o3djs.require('o3djs.loader');
o3djs.require('o3djs.rendergraph');
o3djs.require('o3djs.primitives');
o3djs.require('o3djs.material');
// 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_finished = false; // for selenium testing
var g_eye;
var g_target;
var g_up;
var g_bitmaps = []; // bitmaps by URL.
function makeShape(texture) {
// Create a material.
var myMaterial = o3djs.material.createMaterialFromFile(
g_pack,
'shaders/texture-only.shader',
g_viewInfo.performanceDrawList);
// Creates a quad.
var myShape = o3djs.primitives.createPlane(g_pack,
myMaterial,
3, // width
3, // height
1, // quads across
1); // quads down
// Get the material's sampler parameter, get the sampler on it and set its
// texture.
var sampler_param = myMaterial.getParam('texSampler0');
var sampler = sampler_param.value;
// Set the texture to use.
sampler.texture = texture;
// adjust the scale of our transform to match the aspect ratio of
// the texture. Of course we could also have waited until now to build
// our plane and set its width and height to match instead of scaling
// here.
var textureWidth = texture.width;
var textureHeight = texture.height;
var hScale = 1;
var vScale = 1;
if (textureWidth > textureHeight) {
vScale = textureHeight / textureWidth;
} else if (textureHeight > textureWidth) {
hScale = textureWidth / textureHeight;
}
// We now attach our quad to the root of the transform graph.
// We do this after the texture has loaded, otherwise we'd be attempting
// to display something invalid.
// Make a transform for each quad.
var transform = g_pack.createObject('Transform');
transform.scale(hScale, 1, vScale);
transform.addShape(myShape);
transform.parent = g_client.root;
g_finished = true;
return myShape;
}
function loadBitmap(loader, url) {
loader.loadBitmaps(g_pack, o3djs.util.getAbsoluteURI('assets/' + url),
function(bitmaps, exception) {
if (!exception) {
// We know we are only loading 2D images so there will only be 1 bitmap.
g_bitmaps[url] = bitmaps[0];
} else {
alert(exception);
}
});
}
/**
* Creates the client area.
*/
function init() {
o3djs.util.makeClients(initStep2, 'NotAntiAliased');
}
/**
* Initializes O3D, loads the effect, and loads a tar.gz archive containing
* a bunch of image files. We'll create bitmaps from them.
* And use drawImage function to create texture as well as mipmaps.
*/
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);
// Set up an perspective projection.
var proj_matrix = g_math.matrix4.perspective(
g_math.degToRad(90),
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, 1.5, 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 loader = o3djs.loader.createLoader(callback);
loadBitmap(loader, 'shaving_cream_300x300.jpg');
loadBitmap(loader, 'four_pixel.png');
loadBitmap(loader, 'hi.jpg');
loader.finish();
// Callback that happens when loader.finish() is called and all of
// our textures have finished loading.
function callback() {
// Because bitmaps have their origin at the upper left, and in
// this sample our plane is oriented with the texture coordinate
// origin on the lower left, we need to flip all the bitmaps
// vertically to match coordinate systems.
var kids = g_bitmaps['shaving_cream_300x300.jpg'];
kids.flipVertically();
var four_square = g_bitmaps['four_pixel.png'];
four_square.flipVertically();
var label = g_bitmaps['hi.jpg'];
label.flipVertically();
var texture = g_pack.createTexture2D(300, 300, g_o3d.Texture.XRGB8, 0,
false);
// Draw bitmaps on the texture.
// Scale down entire image into on lower left corner.
texture.drawImage(kids, 0, 0, 0, 300, 300, 0, 0, 0, 150, 150);
// Crop and scale up into the lower right corner.
texture.drawImage(kids, 0, 0, 156, 100, 100, 0, 150, 0, 150, 150);
// Flip and draw part of the image in the top left corner (and
// texture coords are not inclusive -- they go from 0-299 for a
// 300 pixel texture).
texture.drawImage(kids, 0, 150, 150, 150, 150, 0, 149, 299, -150, -150);
// Crop and draw cropped area in upper right corner, but we're
// using a width and height that go beyond the edges of the image.
texture.drawImage(kids, 0, 150, 150, 400, 400, 0, 150, 150, 400, 400);
// Draw "O3D" label.
texture.drawImage(label, 0, 0, 0, 100, 50, 0, 100, 125, 100, 50);
// Fill in different mip-map levels with images that show at
// different distances. (Scroll the mouse wheel to see).
// Fill in medium level with whole image.
texture.drawImage(kids, 0, 0, 0, 300, 300, 1, 0, 0, 150, 150);
// Fill in smaller level with four pixel image.
texture.drawImage(four_square, 0, 0, 0, 2, 2, 2, 0, 0, 75, 75);
makeShape(texture);
}
o3djs.event.addEventListener(o3dElement, 'wheel', scrollMe);
}
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);
}
</script>
</head>
<body>
<h1>Bitmap Draw Image Demo</h1>
This tutorial shows how to create bitmaps and how to draw images
on both bitmaps and texture mipmaps.
<br/>
Scroll wheel to see different mipmaps.
<br/>
<!-- Start of O3D plugin -->
<div id="o3d" style="width: 600px; height: 600px"></div>
<!-- End of O3D plugin -->
</body>
</html>
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