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<h1 class="file-heading">File: src/pixi/renderers/webgl/utils/WebGLStencilManager.js</h1>
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<pre class="code prettyprint linenums">
/**
* @author Mat Groves http://matgroves.com/ @Doormat23
*/
/**
* @class WebGLStencilManager
* @constructor
* @param gl {WebGLContext} the current WebGL drawing context
* @private
*/
PIXI.WebGLStencilManager = function()
{
this.stencilStack = [];
//this.setContext(gl);
this.reverse = true;
this.count = 0;
};
/**
* Sets the drawing context to the one given in parameter
* @method setContext
* @param gl {WebGLContext} the current WebGL drawing context
*/
PIXI.WebGLStencilManager.prototype.setContext = function(gl)
{
this.gl = gl;
};
/**
* Applies the Mask and adds it to the current filter stack
* @method pushMask
* @param maskData {Array}
* @param renderSession {RenderSession}
*/
PIXI.WebGLStencilManager.prototype.pushStencil = function(graphics, webGLData, renderSession)
{
var gl = this.gl;
this.bindGraphics(graphics, webGLData, renderSession);
if(this.stencilStack.length === 0)
{
gl.enable(gl.STENCIL_TEST);
gl.clear(gl.STENCIL_BUFFER_BIT);
this.reverse = true;
this.count = 0;
}
this.stencilStack.push(webGLData);
var level = this.count;
gl.colorMask(false, false, false, false);
gl.stencilFunc(gl.ALWAYS,0,0xFF);
gl.stencilOp(gl.KEEP,gl.KEEP,gl.INVERT);
// draw the triangle strip!
if(webGLData.mode === 1)
{
gl.drawElements(gl.TRIANGLE_FAN, webGLData.indices.length - 4, gl.UNSIGNED_SHORT, 0 );
if(this.reverse)
{
gl.stencilFunc(gl.EQUAL, 0xFF - level, 0xFF);
gl.stencilOp(gl.KEEP,gl.KEEP,gl.DECR);
}
else
{
gl.stencilFunc(gl.EQUAL,level, 0xFF);
gl.stencilOp(gl.KEEP,gl.KEEP,gl.INCR);
}
// draw a quad to increment..
gl.drawElements(gl.TRIANGLE_FAN, 4, gl.UNSIGNED_SHORT, ( webGLData.indices.length - 4 ) * 2 );
if(this.reverse)
{
gl.stencilFunc(gl.EQUAL,0xFF-(level+1), 0xFF);
}
else
{
gl.stencilFunc(gl.EQUAL,level+1, 0xFF);
}
this.reverse = !this.reverse;
}
else
{
if(!this.reverse)
{
gl.stencilFunc(gl.EQUAL, 0xFF - level, 0xFF);
gl.stencilOp(gl.KEEP,gl.KEEP,gl.DECR);
}
else
{
gl.stencilFunc(gl.EQUAL,level, 0xFF);
gl.stencilOp(gl.KEEP,gl.KEEP,gl.INCR);
}
gl.drawElements(gl.TRIANGLE_STRIP, webGLData.indices.length, gl.UNSIGNED_SHORT, 0 );
if(!this.reverse)
{
gl.stencilFunc(gl.EQUAL,0xFF-(level+1), 0xFF);
}
else
{
gl.stencilFunc(gl.EQUAL,level+1, 0xFF);
}
}
gl.colorMask(true, true, true, true);
gl.stencilOp(gl.KEEP,gl.KEEP,gl.KEEP);
this.count++;
};
//TODO this does not belong here!
PIXI.WebGLStencilManager.prototype.bindGraphics = function(graphics, webGLData, renderSession)
{
//if(this._currentGraphics === graphics)return;
this._currentGraphics = graphics;
var gl = this.gl;
// bind the graphics object..
var projection = renderSession.projection,
offset = renderSession.offset,
shader;// = renderSession.shaderManager.primitiveShader;
if(webGLData.mode === 1)
{
shader = renderSession.shaderManager.complexPrimitiveShader;
renderSession.shaderManager.setShader( shader );
gl.uniformMatrix3fv(shader.translationMatrix, false, graphics.worldTransform.toArray(true));
gl.uniform2f(shader.projectionVector, projection.x, -projection.y);
gl.uniform2f(shader.offsetVector, -offset.x, -offset.y);
gl.uniform3fv(shader.tintColor, PIXI.hex2rgb(graphics.tint));
gl.uniform3fv(shader.color, webGLData.color);
gl.uniform1f(shader.alpha, graphics.worldAlpha * webGLData.alpha);
gl.bindBuffer(gl.ARRAY_BUFFER, webGLData.buffer);
gl.vertexAttribPointer(shader.aVertexPosition, 2, gl.FLOAT, false, 4 * 2, 0);
// now do the rest..
// set the index buffer!
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, webGLData.indexBuffer);
}
else
{
//renderSession.shaderManager.activatePrimitiveShader();
shader = renderSession.shaderManager.primitiveShader;
renderSession.shaderManager.setShader( shader );
gl.uniformMatrix3fv(shader.translationMatrix, false, graphics.worldTransform.toArray(true));
gl.uniform2f(shader.projectionVector, projection.x, -projection.y);
gl.uniform2f(shader.offsetVector, -offset.x, -offset.y);
gl.uniform3fv(shader.tintColor, PIXI.hex2rgb(graphics.tint));
gl.uniform1f(shader.alpha, graphics.worldAlpha);
gl.bindBuffer(gl.ARRAY_BUFFER, webGLData.buffer);
gl.vertexAttribPointer(shader.aVertexPosition, 2, gl.FLOAT, false, 4 * 6, 0);
gl.vertexAttribPointer(shader.colorAttribute, 4, gl.FLOAT, false,4 * 6, 2 * 4);
// set the index buffer!
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, webGLData.indexBuffer);
}
};
PIXI.WebGLStencilManager.prototype.popStencil = function(graphics, webGLData, renderSession)
{
var gl = this.gl;
this.stencilStack.pop();
this.count--;
if(this.stencilStack.length === 0)
{
// the stack is empty!
gl.disable(gl.STENCIL_TEST);
}
else
{
var level = this.count;
this.bindGraphics(graphics, webGLData, renderSession);
gl.colorMask(false, false, false, false);
if(webGLData.mode === 1)
{
this.reverse = !this.reverse;
if(this.reverse)
{
gl.stencilFunc(gl.EQUAL, 0xFF - (level+1), 0xFF);
gl.stencilOp(gl.KEEP,gl.KEEP,gl.INCR);
}
else
{
gl.stencilFunc(gl.EQUAL,level+1, 0xFF);
gl.stencilOp(gl.KEEP,gl.KEEP,gl.DECR);
}
// draw a quad to increment..
gl.drawElements(gl.TRIANGLE_FAN, 4, gl.UNSIGNED_SHORT, ( webGLData.indices.length - 4 ) * 2 );
gl.stencilFunc(gl.ALWAYS,0,0xFF);
gl.stencilOp(gl.KEEP,gl.KEEP,gl.INVERT);
// draw the triangle strip!
gl.drawElements(gl.TRIANGLE_FAN, webGLData.indices.length - 4, gl.UNSIGNED_SHORT, 0 );
if(!this.reverse)
{
gl.stencilFunc(gl.EQUAL,0xFF-(level), 0xFF);
}
else
{
gl.stencilFunc(gl.EQUAL,level, 0xFF);
}
}
else
{
// console.log("<<>>")
if(!this.reverse)
{
gl.stencilFunc(gl.EQUAL, 0xFF - (level+1), 0xFF);
gl.stencilOp(gl.KEEP,gl.KEEP,gl.INCR);
}
else
{
gl.stencilFunc(gl.EQUAL,level+1, 0xFF);
gl.stencilOp(gl.KEEP,gl.KEEP,gl.DECR);
}
gl.drawElements(gl.TRIANGLE_STRIP, webGLData.indices.length, gl.UNSIGNED_SHORT, 0 );
if(!this.reverse)
{
gl.stencilFunc(gl.EQUAL,0xFF-(level), 0xFF);
}
else
{
gl.stencilFunc(gl.EQUAL,level, 0xFF);
}
}
gl.colorMask(true, true, true, true);
gl.stencilOp(gl.KEEP,gl.KEEP,gl.KEEP);
}
};
/**
* Destroys the mask stack
* @method destroy
*/
PIXI.WebGLStencilManager.prototype.destroy = function()
{
this.stencilStack = null;
this.gl = null;
};
</pre>
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