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<h1 class="file-heading">File: src/pixi/extras/Strip.js</h1>
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<pre class="code prettyprint linenums">
/**
* @author Mat Groves http://matgroves.com/
*/
/**
*
* @class Strip
* @extends DisplayObjectContainer
* @constructor
* @param texture {Texture} The texture to use
* @param width {Number} the width
* @param height {Number} the height
*
*/
PIXI.Strip = function(texture)
{
PIXI.DisplayObjectContainer.call( this );
this.texture = texture;
// set up the main bits..
this.uvs = new PIXI.Float32Array([0, 1,
1, 1,
1, 0,
0,1]);
this.verticies = new PIXI.Float32Array([0, 0,
100,0,
100,100,
0, 100]);
this.colors = new PIXI.Float32Array([1, 1, 1, 1]);
this.indices = new PIXI.Uint16Array([0, 1, 2, 3]);
this.dirty = true;
};
// constructor
PIXI.Strip.prototype = Object.create(PIXI.DisplayObjectContainer.prototype);
PIXI.Strip.prototype.constructor = PIXI.Strip;
PIXI.Strip.prototype._renderWebGL = function(renderSession)
{
// if the sprite is not visible or the alpha is 0 then no need to render this element
if(!this.visible || this.alpha <= 0)return;
// render triangle strip..
renderSession.spriteBatch.stop();
// init! init!
if(!this._vertexBuffer)this._initWebGL(renderSession);
renderSession.shaderManager.setShader(renderSession.shaderManager.stripShader);
this._renderStrip(renderSession);
///renderSession.shaderManager.activateDefaultShader();
renderSession.spriteBatch.start();
//TODO check culling
};
PIXI.Strip.prototype._initWebGL = function(renderSession)
{
// build the strip!
var gl = renderSession.gl;
this._vertexBuffer = gl.createBuffer();
this._indexBuffer = gl.createBuffer();
this._uvBuffer = gl.createBuffer();
this._colorBuffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, this._vertexBuffer);
gl.bufferData(gl.ARRAY_BUFFER, this.verticies, gl.DYNAMIC_DRAW);
gl.bindBuffer(gl.ARRAY_BUFFER, this._uvBuffer);
gl.bufferData(gl.ARRAY_BUFFER, this.uvs, gl.STATIC_DRAW);
gl.bindBuffer(gl.ARRAY_BUFFER, this._colorBuffer);
gl.bufferData(gl.ARRAY_BUFFER, this.colors, gl.STATIC_DRAW);
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, this._indexBuffer);
gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, this.indices, gl.STATIC_DRAW);
};
PIXI.Strip.prototype._renderStrip = function(renderSession)
{
var gl = renderSession.gl;
var projection = renderSession.projection,
offset = renderSession.offset,
shader = renderSession.shaderManager.stripShader;
// gl.uniformMatrix4fv(shaderProgram.mvMatrixUniform, false, mat4Real);
gl.blendFunc(gl.ONE, gl.ONE_MINUS_SRC_ALPHA);
// set uniforms
gl.uniformMatrix3fv(shader.translationMatrix, false, this.worldTransform.toArray(true));
gl.uniform2f(shader.projectionVector, projection.x, -projection.y);
gl.uniform2f(shader.offsetVector, -offset.x, -offset.y);
gl.uniform1f(shader.alpha, 1);
if(!this.dirty)
{
gl.bindBuffer(gl.ARRAY_BUFFER, this._vertexBuffer);
gl.bufferSubData(gl.ARRAY_BUFFER, 0, this.verticies);
gl.vertexAttribPointer(shader.aVertexPosition, 2, gl.FLOAT, false, 0, 0);
// update the uvs
gl.bindBuffer(gl.ARRAY_BUFFER, this._uvBuffer);
gl.vertexAttribPointer(shader.aTextureCoord, 2, gl.FLOAT, false, 0, 0);
gl.activeTexture(gl.TEXTURE0);
// bind the current texture
gl.bindTexture(gl.TEXTURE_2D, this.texture.baseTexture._glTextures[gl.id] || PIXI.createWebGLTexture(this.texture.baseTexture, gl));
// dont need to upload!
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, this._indexBuffer);
}
else
{
this.dirty = false;
gl.bindBuffer(gl.ARRAY_BUFFER, this._vertexBuffer);
gl.bufferData(gl.ARRAY_BUFFER, this.verticies, gl.STATIC_DRAW);
gl.vertexAttribPointer(shader.aVertexPosition, 2, gl.FLOAT, false, 0, 0);
// update the uvs
gl.bindBuffer(gl.ARRAY_BUFFER, this._uvBuffer);
gl.bufferData(gl.ARRAY_BUFFER, this.uvs, gl.STATIC_DRAW);
gl.vertexAttribPointer(shader.aTextureCoord, 2, gl.FLOAT, false, 0, 0);
gl.activeTexture(gl.TEXTURE0);
gl.bindTexture(gl.TEXTURE_2D, this.texture.baseTexture._glTextures[gl.id] || PIXI.createWebGLTexture(this.texture.baseTexture, gl));
// dont need to upload!
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, this._indexBuffer);
gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, this.indices, gl.STATIC_DRAW);
}
//console.log(gl.TRIANGLE_STRIP)
//
//
gl.drawElements(gl.TRIANGLE_STRIP, this.indices.length, gl.UNSIGNED_SHORT, 0);
};
PIXI.Strip.prototype._renderCanvas = function(renderSession)
{
var context = renderSession.context;
var transform = this.worldTransform;
if (renderSession.roundPixels)
{
context.setTransform(transform.a, transform.c, transform.b, transform.d, transform.tx | 0, transform.ty | 0);
}
else
{
context.setTransform(transform.a, transform.c, transform.b, transform.d, transform.tx, transform.ty);
}
var strip = this;
// draw triangles!!
var verticies = strip.verticies;
var uvs = strip.uvs;
var length = verticies.length/2;
this.count++;
for (var i = 0; i < length-2; i++)
{
// draw some triangles!
var index = i*2;
var x0 = verticies[index], x1 = verticies[index+2], x2 = verticies[index+4];
var y0 = verticies[index+1], y1 = verticies[index+3], y2 = verticies[index+5];
if(true)
{
//expand();
var centerX = (x0 + x1 + x2)/3;
var centerY = (y0 + y1 + y2)/3;
var normX = x0 - centerX;
var normY = y0 - centerY;
var dist = Math.sqrt( normX * normX + normY * normY );
x0 = centerX + (normX / dist) * (dist + 3);
y0 = centerY + (normY / dist) * (dist + 3);
//
normX = x1 - centerX;
normY = y1 - centerY;
dist = Math.sqrt( normX * normX + normY * normY );
x1 = centerX + (normX / dist) * (dist + 3);
y1 = centerY + (normY / dist) * (dist + 3);
normX = x2 - centerX;
normY = y2 - centerY;
dist = Math.sqrt( normX * normX + normY * normY );
x2 = centerX + (normX / dist) * (dist + 3);
y2 = centerY + (normY / dist) * (dist + 3);
}
var u0 = uvs[index] * strip.texture.width, u1 = uvs[index+2] * strip.texture.width, u2 = uvs[index+4]* strip.texture.width;
var v0 = uvs[index+1]* strip.texture.height, v1 = uvs[index+3] * strip.texture.height, v2 = uvs[index+5]* strip.texture.height;
context.save();
context.beginPath();
context.moveTo(x0, y0);
context.lineTo(x1, y1);
context.lineTo(x2, y2);
context.closePath();
context.clip();
// Compute matrix transform
var delta = u0*v1 + v0*u2 + u1*v2 - v1*u2 - v0*u1 - u0*v2;
var deltaA = x0*v1 + v0*x2 + x1*v2 - v1*x2 - v0*x1 - x0*v2;
var deltaB = u0*x1 + x0*u2 + u1*x2 - x1*u2 - x0*u1 - u0*x2;
var deltaC = u0*v1*x2 + v0*x1*u2 + x0*u1*v2 - x0*v1*u2 - v0*u1*x2 - u0*x1*v2;
var deltaD = y0*v1 + v0*y2 + y1*v2 - v1*y2 - v0*y1 - y0*v2;
var deltaE = u0*y1 + y0*u2 + u1*y2 - y1*u2 - y0*u1 - u0*y2;
var deltaF = u0*v1*y2 + v0*y1*u2 + y0*u1*v2 - y0*v1*u2 - v0*u1*y2 - u0*y1*v2;
context.transform(deltaA / delta, deltaD / delta,
deltaB / delta, deltaE / delta,
deltaC / delta, deltaF / delta);
context.drawImage(strip.texture.baseTexture.source, 0, 0);
context.restore();
}
};
/*
* Sets the texture that the Strip will use
*
* @method setTexture
* @param texture {Texture} the texture that will be used
* @private
*/
/*
PIXI.Strip.prototype.setTexture = function(texture)
{
//TODO SET THE TEXTURES
//TODO VISIBILITY
// stop current texture
this.texture = texture;
this.width = texture.frame.width;
this.height = texture.frame.height;
this.updateFrame = true;
};
*/
/**
* When the texture is updated, this event will fire to update the scale and frame
*
* @method onTextureUpdate
* @param event
* @private
*/
PIXI.Strip.prototype.onTextureUpdate = function()
{
this.updateFrame = true;
};
</pre>
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