CCDrawingPrimitivesWebGL.js

/****************************************************************************
 Copyright (c) 2008-2010 Ricardo Quesada
 Copyright (c) 2011-2012 cocos2d-x.org
 Copyright (c) 2013-2014 Chukong Technologies Inc.

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/**
 * Canvas of DrawingPrimitive implement version use for WebGlMode
 * @class
 * @extends cc.Class
 */
cc.DrawingPrimitiveWebGL = cc.Class.extend(/** @lends cc.DrawingPrimitiveWebGL# */{
    _renderContext:null,
    _initialized:false,
    _shader: null,
    _colorLocation: "u_color",
    _colorArray: null,
    _pointSizeLocation: "u_pointSize",
    _pointSize:-1,
    /**
     * contructor of cc.DrawingPrimitiveWebGL
     * @param ctx rendercontext
     */
    ctor:function (ctx) {
        if (ctx == null)
            ctx = cc._renderContext;

        if (!ctx instanceof  WebGLRenderingContext)
            throw new Error("Can't initialise DrawingPrimitiveWebGL. context need is WebGLRenderingContext");

        this._renderContext = ctx;
        this._colorArray = new Float32Array([1.0, 1.0, 1.0, 1.0]);
    },

    lazy_init:function () {
        var _t = this;
        if (!_t._initialized) {
            //
            // Position and 1 color passed as a uniform (to similate glColor4ub )
            //
            _t._shader = cc.shaderCache.programForKey(cc.SHADER_POSITION_UCOLOR);
            _t._shader._addUniformLocation(this._colorLocation);
            _t._shader._addUniformLocation(this._pointSizeLocation);

            _t._initialized = true;
        }
    },

    /**
     * initlialize context
     */
    drawInit:function () {
        this._initialized = false;
    },

    /**
     * draws a point given x and y coordinate measured in points
     * @param {cc.Point} point
     */
    drawPoint:function (point) {
        this.lazy_init();

        var glContext = this._renderContext;
        this._shader.use();
        this._shader.setUniformForModelViewAndProjectionMatrixWithMat4();
        cc.glEnableVertexAttribs(cc.VERTEX_ATTRIB_FLAG_POSITION);
        this._shader.setUniformLocationWith4fv(this._colorLocation, this._colorArray);
        this._shader.setUniformLocationWith1f(this._pointSizeLocation, this._pointSize);

        var pointBuffer = glContext.createBuffer();
        glContext.bindBuffer(glContext.ARRAY_BUFFER, pointBuffer);
        glContext.bufferData(glContext.ARRAY_BUFFER, new Float32Array([point.x, point.y]), glContext.STATIC_DRAW);
        glContext.vertexAttribPointer(cc.VERTEX_ATTRIB_POSITION, 2, glContext.FLOAT, false, 0, 0);

        glContext.drawArrays(glContext.POINTS, 0, 1);
        glContext.deleteBuffer(pointBuffer);

        cc.incrementGLDraws(1);
    },

    /**
     * draws an array of points.
     * @param {Array} points point of array
     * @param {Number} numberOfPoints
     */
    drawPoints:function (points, numberOfPoints) {
        if (!points || points.length === 0)
            return;

        this.lazy_init();

        var glContext = this._renderContext;
        this._shader.use();
        this._shader.setUniformForModelViewAndProjectionMatrixWithMat4();
        cc.glEnableVertexAttribs(cc.VERTEX_ATTRIB_FLAG_POSITION);
        this._shader.setUniformLocationWith4fv(this._colorLocation, this._colorArray);
        this._shader.setUniformLocationWith1f(this._pointSizeLocation, this._pointSize);

        var pointBuffer = glContext.createBuffer();
        glContext.bindBuffer(glContext.ARRAY_BUFFER, pointBuffer);
        glContext.bufferData(glContext.ARRAY_BUFFER, this._pointsToTypeArray(points), glContext.STATIC_DRAW);
        glContext.vertexAttribPointer(cc.VERTEX_ATTRIB_POSITION, 2, glContext.FLOAT, false, 0, 0);

        glContext.drawArrays(glContext.POINTS, 0, points.length);
        glContext.deleteBuffer(pointBuffer);

        cc.incrementGLDraws(1);
    },

    _pointsToTypeArray:function (points) {
        var typeArr = new Float32Array(points.length * 2);
        for (var i = 0; i < points.length; i++) {
            typeArr[i * 2] = points[i].x;
            typeArr[i * 2 + 1] = points[i].y;
        }
        return typeArr;
    },

    /**
     * draws a line given the origin and destination point measured in points
     * @param {cc.Point} origin
     * @param {cc.Point} destination
     */
    drawLine:function (origin, destination) {
        this.lazy_init();

        var glContext = this._renderContext;
        this._shader.use();
        this._shader.setUniformForModelViewAndProjectionMatrixWithMat4();
        cc.glEnableVertexAttribs(cc.VERTEX_ATTRIB_FLAG_POSITION);
        this._shader.setUniformLocationWith4fv(this._colorLocation, this._colorArray);

        var pointBuffer = glContext.createBuffer();
        glContext.bindBuffer(glContext.ARRAY_BUFFER, pointBuffer);
        glContext.bufferData(glContext.ARRAY_BUFFER, this._pointsToTypeArray([origin, destination]), glContext.STATIC_DRAW);
        glContext.vertexAttribPointer(cc.VERTEX_ATTRIB_POSITION, 2, glContext.FLOAT, false, 0, 0);

        glContext.drawArrays(glContext.LINES, 0, 2);
        glContext.deleteBuffer(pointBuffer);

        cc.incrementGLDraws(1);
    },

    /**
     * draws a rectangle given the origin and destination point measured in points.
     * @param {cc.Point} origin
     * @param {cc.Point} destination
     */
    drawRect:function (origin, destination) {
        this.drawLine(cc.p(origin.x, origin.y), cc.p(destination.x, origin.y));
        this.drawLine(cc.p(destination.x, origin.y), cc.p(destination.x, destination.y));
        this.drawLine(cc.p(destination.x, destination.y), cc.p(origin.x, destination.y));
        this.drawLine(cc.p(origin.x, destination.y), cc.p(origin.x, origin.y));
    },

    /**
     * draws a solid rectangle given the origin and destination point measured in points.
     * @param {cc.Point} origin
     * @param {cc.Point} destination
     * @param {cc.Color} color
     */
    drawSolidRect:function (origin, destination, color) {
        var vertices = [
            origin,
            cc.p(destination.x, origin.y),
            destination,
            cc.p(origin.x, destination.y)
        ];

        this.drawSolidPoly(vertices, 4, color);
    },

    /**
     * draws a polygon given a pointer to cc.Point coordiantes and the number of vertices measured in points.
     * @param {Array} vertices a pointer to cc.Point coordiantes
     * @param {Number} numOfVertices the number of vertices measured in points
     * @param {Boolean} closePolygon The polygon can be closed or open
     */
    drawPoly:function (vertices, numOfVertices, closePolygon) {
        this.lazy_init();

        var glContext = this._renderContext;
        this._shader.use();
        this._shader.setUniformForModelViewAndProjectionMatrixWithMat4();
        cc.glEnableVertexAttribs(cc.VERTEX_ATTRIB_FLAG_POSITION);
        this._shader.setUniformLocationWith4fv(this._colorLocation, this._colorArray);

        var pointBuffer = glContext.createBuffer();
        glContext.bindBuffer(glContext.ARRAY_BUFFER, pointBuffer);
        glContext.bufferData(glContext.ARRAY_BUFFER, this._pointsToTypeArray(vertices), glContext.STATIC_DRAW);
        glContext.vertexAttribPointer(cc.VERTEX_ATTRIB_POSITION, 2, glContext.FLOAT, false, 0, 0);

        if (closePolygon)
            glContext.drawArrays(glContext.LINE_LOOP, 0, vertices.length);
        else
            glContext.drawArrays(glContext.LINE_STRIP, 0, vertices.length);
        glContext.deleteBuffer(pointBuffer);

        cc.incrementGLDraws(1);
    },

    /**
     * draws a solid polygon given a pointer to CGPoint coordiantes, the number of vertices measured in points, and a color.
     * @param {Array} poli
     * @param {Number} numberOfPoints
     * @param {cc.Color} color
     */
    drawSolidPoly:function (poli, numberOfPoints, color) {
        this.lazy_init();
        if (color)
            this.setDrawColor(color.r, color.g, color.b, color.a);

        var glContext = this._renderContext;
        this._shader.use();
        this._shader.setUniformForModelViewAndProjectionMatrixWithMat4();
        cc.glEnableVertexAttribs(cc.VERTEX_ATTRIB_FLAG_POSITION);
        this._shader.setUniformLocationWith4fv(this._colorLocation, this._colorArray);

        var pointBuffer = glContext.createBuffer();
        glContext.bindBuffer(glContext.ARRAY_BUFFER, pointBuffer);
        glContext.bufferData(glContext.ARRAY_BUFFER, this._pointsToTypeArray(poli), glContext.STATIC_DRAW);
        glContext.vertexAttribPointer(cc.VERTEX_ATTRIB_POSITION, 2, glContext.FLOAT, false, 0, 0);
        glContext.drawArrays(glContext.TRIANGLE_FAN, 0, poli.length);
        glContext.deleteBuffer(pointBuffer);

        cc.incrementGLDraws(1);
    },

    /**
     * draws a circle given the center, radius and number of segments.
     * @param {cc.Point} center center of circle
     * @param {Number} radius
     * @param {Number} angle angle in radians
     * @param {Number} segments
     * @param {Boolean} drawLineToCenter
     */
    drawCircle:function (center, radius, angle, segments, drawLineToCenter) {
        this.lazy_init();

        var additionalSegment = 1;
        if (drawLineToCenter)
            additionalSegment++;

        var coef = 2.0 * Math.PI / segments;

        var vertices = new Float32Array((segments + 2) * 2);
        if (!vertices)
            return;

        for (var i = 0; i <= segments; i++) {
            var rads = i * coef;
            var j = radius * Math.cos(rads + angle) + center.x;
            var k = radius * Math.sin(rads + angle) + center.y;

            vertices[i * 2] = j;
            vertices[i * 2 + 1] = k;
        }
        vertices[(segments + 1) * 2] = center.x;
        vertices[(segments + 1) * 2 + 1] = center.y;

        var glContext = this._renderContext;
        this._shader.use();
        this._shader.setUniformForModelViewAndProjectionMatrixWithMat4();
        cc.glEnableVertexAttribs(cc.VERTEX_ATTRIB_FLAG_POSITION);
        this._shader.setUniformLocationWith4fv(this._colorLocation, this._colorArray);

        var pointBuffer = glContext.createBuffer();
        glContext.bindBuffer(glContext.ARRAY_BUFFER, pointBuffer);
        glContext.bufferData(glContext.ARRAY_BUFFER, vertices, glContext.STATIC_DRAW);
        glContext.vertexAttribPointer(cc.VERTEX_ATTRIB_POSITION, 2, glContext.FLOAT, false, 0, 0);

        glContext.drawArrays(glContext.LINE_STRIP, 0, segments + additionalSegment);
        glContext.deleteBuffer(pointBuffer);

        cc.incrementGLDraws(1);
    },

    /**
     * draws a quad bezier path
     * @param {cc.Point} origin
     * @param {cc.Point} control
     * @param {cc.Point} destination
     * @param {Number} segments
     */
    drawQuadBezier:function (origin, control, destination, segments) {
        this.lazy_init();

        var vertices = new Float32Array((segments + 1) * 2);

        var t = 0.0;
        for (var i = 0; i < segments; i++) {
            vertices[i * 2] = Math.pow(1 - t, 2) * origin.x + 2.0 * (1 - t) * t * control.x + t * t * destination.x;
            vertices[i * 2 + 1] = Math.pow(1 - t, 2) * origin.y + 2.0 * (1 - t) * t * control.y + t * t * destination.y;
            t += 1.0 / segments;
        }
        vertices[segments * 2] = destination.x;
        vertices[segments * 2 + 1] = destination.y;

        var glContext = this._renderContext;
        this._shader.use();
        this._shader.setUniformForModelViewAndProjectionMatrixWithMat4();
        cc.glEnableVertexAttribs(cc.VERTEX_ATTRIB_FLAG_POSITION);
        this._shader.setUniformLocationWith4fv(this._colorLocation, this._colorArray);

        var pointBuffer = glContext.createBuffer();
        glContext.bindBuffer(glContext.ARRAY_BUFFER, pointBuffer);
        glContext.bufferData(glContext.ARRAY_BUFFER, vertices, glContext.STATIC_DRAW);
        glContext.vertexAttribPointer(cc.VERTEX_ATTRIB_POSITION, 2, glContext.FLOAT, false, 0, 0);

        glContext.drawArrays(glContext.LINE_STRIP, 0, segments + 1);
        glContext.deleteBuffer(pointBuffer);

        cc.incrementGLDraws(1);
    },

    /**
     * draws a cubic bezier path
     * @param {cc.Point} origin
     * @param {cc.Point} control1
     * @param {cc.Point} control2
     * @param {cc.Point} destination
     * @param {Number} segments
     */
    drawCubicBezier:function (origin, control1, control2, destination, segments) {
        this.lazy_init();

        var vertices = new Float32Array((segments + 1) * 2);

        var t = 0;
        for (var i = 0; i < segments; i++) {
            vertices[i * 2] = Math.pow(1 - t, 3) * origin.x + 3.0 * Math.pow(1 - t, 2) * t * control1.x + 3.0 * (1 - t) * t * t * control2.x + t * t * t * destination.x;
            vertices[i * 2 + 1] = Math.pow(1 - t, 3) * origin.y + 3.0 * Math.pow(1 - t, 2) * t * control1.y + 3.0 * (1 - t) * t * t * control2.y + t * t * t * destination.y;
            t += 1.0 / segments;
        }
        vertices[segments * 2] = destination.x;
        vertices[segments * 2 + 1] = destination.y;

        var glContext = this._renderContext;
        this._shader.use();
        this._shader.setUniformForModelViewAndProjectionMatrixWithMat4();
        cc.glEnableVertexAttribs(cc.VERTEX_ATTRIB_FLAG_POSITION);
        this._shader.setUniformLocationWith4fv(this._colorLocation, this._colorArray);

        var pointBuffer = glContext.createBuffer();
        glContext.bindBuffer(glContext.ARRAY_BUFFER, pointBuffer);
        glContext.bufferData(glContext.ARRAY_BUFFER, vertices, glContext.STATIC_DRAW);
        glContext.vertexAttribPointer(cc.VERTEX_ATTRIB_POSITION, 2, glContext.FLOAT, false, 0, 0);
        glContext.drawArrays(glContext.LINE_STRIP, 0, segments + 1);
        glContext.deleteBuffer(pointBuffer);

        cc.incrementGLDraws(1);
    },

    /**
     * draw a catmull rom line
     * @param {Array} points
     * @param {Number} segments
     */
    drawCatmullRom:function (points, segments) {
        this.drawCardinalSpline(points, 0.5, segments);
    },

    /**
     * draw a cardinal spline path
     * @param {Array} config
     * @param {Number} tension
     * @param {Number} segments
     */
    drawCardinalSpline:function (config, tension, segments) {
        this.lazy_init();

        var vertices = new Float32Array((segments + 1) * 2);
        var p, lt, deltaT = 1.0 / config.length;
        for (var i = 0; i < segments + 1; i++) {
            var dt = i / segments;

            // border
            if (dt === 1) {
                p = config.length - 1;
                lt = 1;
            } else {
                p = 0 | (dt / deltaT);
                lt = (dt - deltaT * p) / deltaT;
            }

            var newPos = cc.cardinalSplineAt(
                cc.getControlPointAt(config, p - 1),
                cc.getControlPointAt(config, p),
                cc.getControlPointAt(config, p + 1),
                cc.getControlPointAt(config, p + 2),
                tension, lt);
            // Interpolate

            vertices[i * 2] = newPos.x;
            vertices[i * 2 + 1] = newPos.y;
        }

        var glContext = this._renderContext;
        this._shader.use();
        this._shader.setUniformForModelViewAndProjectionMatrixWithMat4();
        cc.glEnableVertexAttribs(cc.VERTEX_ATTRIB_FLAG_POSITION);
        this._shader.setUniformLocationWith4fv(this._colorLocation, this._colorArray);

        var pointBuffer = glContext.createBuffer();
        glContext.bindBuffer(glContext.ARRAY_BUFFER, pointBuffer);
        glContext.bufferData(glContext.ARRAY_BUFFER, vertices, glContext.STATIC_DRAW);
        glContext.vertexAttribPointer(cc.VERTEX_ATTRIB_POSITION, 2, glContext.FLOAT, false, 0, 0);
        glContext.drawArrays(glContext.LINE_STRIP, 0, segments + 1);
        glContext.deleteBuffer(pointBuffer);

        cc.incrementGLDraws(1);
    },

    /**
     * set the drawing color with 4 unsigned bytes
     * @param {Number} r red value (0 to 255)
     * @param {Number} g green value (0 to 255)
     * @param {Number} b blue value (0 to 255)
     * @param {Number} a Alpha value (0 to 255)
     */
    setDrawColor:function (r, g, b, a) {
        this._colorArray[0] = r / 255.0;
        this._colorArray[1] = g / 255.0;
        this._colorArray[2] = b / 255.0;
        this._colorArray[3] = a / 255.0;
    },

    /**
     * set the point size in points. Default 1.
     * @param {Number} pointSize
     */
    setPointSize:function (pointSize) {
        this._pointSize = pointSize * cc.contentScaleFactor();
    },

    /**
     * set the line width. Default 1.
     * @param {Number} width
     */
    setLineWidth:function (width) {
        if(this._renderContext.lineWidth)
            this._renderContext.lineWidth(width);
    }
});