pixi.js/docs/files/src_pixi_renderers_webgl_utils_WebGLSpriteBatch.js.html
Mat Groves 847eb6c48e Docs updated
Fixed issue where alpha not being set correctly in canvas spriteBatch
Fixed issue where previous stage events did not get removed correctly
2014-01-28 00:08:50 +00:00

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<h1 class="file-heading">File: src/pixi/renderers/webgl/utils/WebGLSpriteBatch.js</h1>
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<pre class="code prettyprint linenums">
/**
* @author Mat Groves
*
* Big thanks to the very clever Matt DesLauriers &lt;mattdesl&gt; https://github.com/mattdesl/
* for creating the original pixi version!
*
* Heavily inspired by LibGDX&#x27;s WebGLSpriteBatch:
* https://github.com/libgdx/libgdx/blob/master/gdx/src/com/badlogic/gdx/graphics/g2d/WebGLSpriteBatch.java
*/
PIXI.WebGLSpriteBatch = function(gl)
{
this.vertSize = 6;
this.size = 10000;//Math.pow(2, 16) / this.vertSize;
// console.log(this.size);
//the total number of floats in our batch
var numVerts = this.size * 4 * this.vertSize;
//the total number of indices in our batch
var numIndices = this.size * 6;
//vertex data
this.vertices = new Float32Array(numVerts);
//index data
this.indices = new Uint16Array(numIndices);
this.lastIndexCount = 0;
for (var i=0, j=0; i &lt; numIndices; i += 6, j += 4)
{
this.indices[i + 0] = j + 0;
this.indices[i + 1] = j + 1;
this.indices[i + 2] = j + 2;
this.indices[i + 3] = j + 0;
this.indices[i + 4] = j + 2;
this.indices[i + 5] = j + 3;
}
this.drawing = false;
this.currentBatchSize = 0;
this.currentBaseTexture = null;
this.setContext(gl);
};
PIXI.WebGLSpriteBatch.prototype.setContext = function(gl)
{
this.gl = gl;
// create a couple of buffers
this.vertexBuffer = gl.createBuffer();
this.indexBuffer = gl.createBuffer();
// 65535 is max index, so 65535 / 6 = 10922.
//upload the index data
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, this.indexBuffer);
gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, this.indices, gl.STATIC_DRAW);
gl.bindBuffer(gl.ARRAY_BUFFER, this.vertexBuffer);
gl.bufferData(gl.ARRAY_BUFFER, this.vertices, gl.DYNAMIC_DRAW);
this.currentBlendMode = 99999;
};
PIXI.WebGLSpriteBatch.prototype.begin = function(renderSession)
{
this.renderSession = renderSession;
this.shader = this.renderSession.shaderManager.defaultShader;
this.start();
};
PIXI.WebGLSpriteBatch.prototype.end = function()
{
this.flush();
};
PIXI.WebGLSpriteBatch.prototype.render = function(sprite)
{
// check texture..
if(sprite.texture.baseTexture !== this.currentBaseTexture || this.currentBatchSize &gt;= this.size)
{
this.flush();
this.currentBaseTexture = sprite.texture.baseTexture;
}
// check blend mode
if(sprite.blendMode !== this.currentBlendMode)
{
this.setBlendMode(sprite.blendMode);
}
// get the uvs for the texture
var uvs = sprite._uvs || sprite.texture._uvs;
// if the uvs have not updated then no point rendering just yet!
if(!uvs)return;
// get the sprites current alpha
var alpha = sprite.worldAlpha;
var tint = sprite.tint;
var verticies = this.vertices;
var width = sprite.texture.frame.width;
var height = sprite.texture.frame.height;
// TODO trim??
var aX = sprite.anchor.x;
var aY = sprite.anchor.y;
var w0, w1, h0, h1;
if (sprite.texture.trimmed)
{
// if the sprite is trimmed then we need to add the extra space before transforming the sprite coords..
var trim = sprite.texture.trim;
w1 = trim.x - aX * trim.realWidth;
w0 = w1 + width;
h1 = trim.y - aY * trim.realHeight;
h0 = h1 + height;
}
else
{
w0 = (width ) * (1-aX);
w1 = (width ) * -aX;
h0 = height * (1-aY);
h1 = height * -aY;
}
var index = this.currentBatchSize * 4 * this.vertSize;
var worldTransform = sprite.worldTransform;
var a = worldTransform[0];
var b = worldTransform[3];
var c = worldTransform[1];
var d = worldTransform[4];
var tx = worldTransform[2];
var ty = worldTransform[5];
// xy
verticies[index++] = a * w1 + c * h1 + tx;
verticies[index++] = d * h1 + b * w1 + ty;
// uv
verticies[index++] = uvs[0];
verticies[index++] = uvs[1];
// color
verticies[index++] = alpha;
verticies[index++] = tint;
// xy
verticies[index++] = a * w0 + c * h1 + tx;
verticies[index++] = d * h1 + b * w0 + ty;
// uv
verticies[index++] = uvs[2];
verticies[index++] = uvs[3];
// color
verticies[index++] = alpha;
verticies[index++] = tint;
// xy
verticies[index++] = a * w0 + c * h0 + tx;
verticies[index++] = d * h0 + b * w0 + ty;
// uv
verticies[index++] = uvs[4];
verticies[index++] = uvs[5];
// color
verticies[index++] = alpha;
verticies[index++] = tint;
// xy
verticies[index++] = a * w1 + c * h0 + tx;
verticies[index++] = d * h0 + b * w1 + ty;
// uv
verticies[index++] = uvs[6];
verticies[index++] = uvs[7];
// color
verticies[index++] = alpha;
verticies[index++] = tint;
// increment the batchsize
this.currentBatchSize++;
};
PIXI.WebGLSpriteBatch.prototype.renderTilingSprite = function(tilingSprite)
{
var texture = tilingSprite.tilingTexture;
if(texture.baseTexture !== this.currentBaseTexture || this.currentBatchSize &gt;= this.size)
{
this.flush();
this.currentBaseTexture = texture.baseTexture;
}
// check blend mode
if(tilingSprite.blendMode !== this.currentBlendMode)
{
this.setBlendMode(tilingSprite.blendMode);
}
// set the textures uvs temporarily
// TODO create a separate texture so that we can tile part of a texture
if(!tilingSprite._uvs)tilingSprite._uvs = new Float32Array(8);
var uvs = tilingSprite._uvs;
var offsetX = tilingSprite.tilePosition.x/texture.baseTexture.width;
var offsetY = tilingSprite.tilePosition.y/texture.baseTexture.height;
var scaleX = (tilingSprite.width / texture.baseTexture.width) / (tilingSprite.tileScale.x * tilingSprite.tileScaleOffset.x);
var scaleY = (tilingSprite.height / texture.baseTexture.height) / (tilingSprite.tileScale.y * tilingSprite.tileScaleOffset.y);
uvs[0] = 0 - offsetX;
uvs[1] = 0 - offsetY;
uvs[2] = (1 * scaleX) - offsetX;
uvs[3] = 0 - offsetY;
uvs[4] = (1 * scaleX) - offsetX;
uvs[5] = (1 * scaleY) - offsetY;
uvs[6] = 0 - offsetX;
uvs[7] = (1 *scaleY) - offsetY;
// get the tilingSprites current alpha
var alpha = tilingSprite.worldAlpha;
var tint = tilingSprite.tint;
var verticies = this.vertices;
var width = tilingSprite.width;
var height = tilingSprite.height;
// TODO trim??
var aX = tilingSprite.anchor.x; // - tilingSprite.texture.trim.x
var aY = tilingSprite.anchor.y; //- tilingSprite.texture.trim.y
var w0 = width * (1-aX);
var w1 = width * -aX;
var h0 = height * (1-aY);
var h1 = height * -aY;
var index = this.currentBatchSize * 4 * this.vertSize;
var worldTransform = tilingSprite.worldTransform;
var a = worldTransform[0];
var b = worldTransform[3];
var c = worldTransform[1];
var d = worldTransform[4];
var tx = worldTransform[2];
var ty = worldTransform[5];
// xy
verticies[index++] = a * w1 + c * h1 + tx;
verticies[index++] = d * h1 + b * w1 + ty;
// uv
verticies[index++] = uvs[0];
verticies[index++] = uvs[1];
// color
verticies[index++] = alpha;
verticies[index++] = tint;
// xy
verticies[index++] = a * w0 + c * h1 + tx;
verticies[index++] = d * h1 + b * w0 + ty;
// uv
verticies[index++] = uvs[2];
verticies[index++] = uvs[3];
// color
verticies[index++] = alpha;
verticies[index++] = tint;
// xy
verticies[index++] = a * w0 + c * h0 + tx;
verticies[index++] = d * h0 + b * w0 + ty;
// uv
verticies[index++] = uvs[4];
verticies[index++] = uvs[5];
// color
verticies[index++] = alpha;
verticies[index++] = tint;
// xy
verticies[index++] = a * w1 + c * h0 + tx;
verticies[index++] = d * h0 + b * w1 + ty;
// uv
verticies[index++] = uvs[6];
verticies[index++] = uvs[7];
// color
verticies[index++] = alpha;
verticies[index++] = tint;
// increment the batchs
this.currentBatchSize++;
};
PIXI.WebGLSpriteBatch.prototype.flush = function()
{
// If the batch is length 0 then return as there is nothing to draw
if (this.currentBatchSize===0)return;
var gl = this.gl;
// bind the current texture
gl.bindTexture(gl.TEXTURE_2D, this.currentBaseTexture._glTextures[gl.id] || PIXI.createWebGLTexture(this.currentBaseTexture, gl));
// upload the verts to the buffer
if(this.currentBatchSize &gt; ( this.size * 0.5 ) )
{
gl.bufferSubData(gl.ARRAY_BUFFER, 0, this.vertices);
}
else
{
var view = this.vertices.subarray(0, this.currentBatchSize * 4 * this.vertSize);
gl.bufferSubData(gl.ARRAY_BUFFER, 0, view);
}
// var view = this.vertices.subarray(0, this.currentBatchSize * 4 * this.vertSize);
//gl.bufferSubData(gl.ARRAY_BUFFER, 0, view);
// now draw those suckas!
gl.drawElements(gl.TRIANGLES, this.currentBatchSize * 6, gl.UNSIGNED_SHORT, 0);
// then reset the batch!
this.currentBatchSize = 0;
// increment the draw count
this.renderSession.drawCount++;
};
PIXI.WebGLSpriteBatch.prototype.stop = function()
{
this.flush();
};
PIXI.WebGLSpriteBatch.prototype.start = function()
{
var gl = this.gl;
// bind the main texture
gl.activeTexture(gl.TEXTURE0);
// bind the buffers
gl.bindBuffer(gl.ARRAY_BUFFER, this.vertexBuffer);
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, this.indexBuffer);
// set the projection
var projection = this.renderSession.projection;
gl.uniform2f(this.shader.projectionVector, projection.x, projection.y);
// set the pointers
var stride = this.vertSize * 4;
gl.vertexAttribPointer(this.shader.aVertexPosition, 2, gl.FLOAT, false, stride, 0);
gl.vertexAttribPointer(this.shader.aTextureCoord, 2, gl.FLOAT, false, stride, 2 * 4);
gl.vertexAttribPointer(this.shader.colorAttribute, 2, gl.FLOAT, false, stride, 4 * 4);
// set the blend mode..
if(this.currentBlendMode !== PIXI.blendModes.NORMAL)
{
this.setBlendMode(PIXI.blendModes.NORMAL);
}
};
PIXI.WebGLSpriteBatch.prototype.setBlendMode = function(blendMode)
{
this.flush();
this.currentBlendMode = blendMode;
var blendModeWebGL = PIXI.blendModesWebGL[this.currentBlendMode];
this.gl.blendFunc(blendModeWebGL[0], blendModeWebGL[1]);
};
PIXI.WebGLSpriteBatch.prototype.destroy = function()
{
this.vertices = null;
this.indices = null;
this.gl.deleteBuffer( this.vertexBuffer );
this.gl.deleteBuffer( this.indexBuffer );
this.currentBaseTexture = null;
this.gl = null;
};
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