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"mocha": "^10.2.0", + "mocha": "^6.2.2", "np": "^7.6.2", "omggif": "^1.0.10", "open": "^7.0.3", diff --git a/src/core/shape/attributes.js b/src/core/shape/attributes.js index 852ffccf59..71fd48a44b 100644 --- a/src/core/shape/attributes.js +++ b/src/core/shape/attributes.js @@ -269,7 +269,7 @@ p5.prototype.strokeCap = function(cap) { * Sets the style of the joints which connect line segments. These joints * are either mitered, beveled, or rounded and specified with the * corresponding parameters: `MITER`, `BEVEL`, or `ROUND`. The default joint is - * `MITER`. + * `MITER` in 2D mode and `ROUND` in WebGL mode. * * The parameter to this method must be written in ALL CAPS because they are * predefined as constants in ALL CAPS and Javascript is a case-sensitive language. diff --git a/src/webgl/p5.Geometry.js b/src/webgl/p5.Geometry.js index 7c615c3e2f..6f724bb895 100644 --- a/src/webgl/p5.Geometry.js +++ b/src/webgl/p5.Geometry.js @@ -25,11 +25,19 @@ p5.Geometry = function(detailX, detailY, callback) { //an array containing every vertex for stroke drawing this.lineVertices = []; - //an array 1 normal per lineVertex with - //final position representing which direction to - //displace for strokeWeight - //[[0,0,-1,1], [0,1,0,-1] ...]; - this.lineNormals = []; + // The tangents going into or out of a vertex on a line. Along a straight + // line segment, both should be equal. At an endpoint, one or the other + // will not exist and will be all 0. In joins between line segments, they + // may be different, as they will be the tangents on either side of the join. + this.lineTangentsIn = []; + this.lineTangentsOut = []; + + // When drawing lines with thickness, entries in this buffer represent which + // side of the centerline the vertex will be placed. The sign of the number + // will represent the side of the centerline, and the absolute value will be + // used as an enum to determine which part of the cap or join each vertex + // represents. See the doc comments for _addCap and _addJoin for diagrams. + this.lineSides = []; //an array containing 1 normal per vertex //@type [p5.Vector] @@ -64,7 +72,9 @@ p5.Geometry = function(detailX, detailY, callback) { p5.Geometry.prototype.reset = function() { this.lineVertices.length = 0; - this.lineNormals.length = 0; + this.lineTangentsIn.length = 0; + this.lineTangentsOut.length = 0; + this.lineSides.length = 0; this.vertices.length = 0; this.edges.length = 0; @@ -240,55 +250,221 @@ p5.Geometry.prototype._makeTriangleEdges = function() { }; /** - * Create 4 vertices for each stroke line, two at the beginning position - * and two at the end position. These vertices are displaced relative to - * that line's normal on the GPU + * Converts each line segment into the vertices and vertex attributes needed + * to turn the line into a polygon on screen. This will include: + * - Two triangles line segment to create a rectangle + * - Two triangles per endpoint to create a stroke cap rectangle. A fragment + * shader is responsible for displaying the appropriate cap style within + * that rectangle. + * - Four triangles per join between adjacent line segments, creating a quad on + * either side of the join, perpendicular to the lines. A vertex shader will + * discard the quad in the "elbow" of the join, and a fragment shader will + * display the appropriate join style within the remaining quad. + * * @private * @chainable */ p5.Geometry.prototype._edgesToVertices = function() { - const lineColorData = []; this.lineVertices.length = 0; - this.lineNormals.length = 0; - + this.lineTangentsIn.length = 0; + this.lineTangentsOut.length = 0; + this.lineSides.length = 0; + + const closed = + this.edges.length > 1 && + this.edges[0][0] === this.edges[this.edges.length - 1][1]; + let addedStartingCap = false; + let lastValidDir; for (let i = 0; i < this.edges.length; i++) { - const endIndex0 = this.edges[i][0]; - const endIndex1 = this.edges[i][1]; - const begin = this.vertices[endIndex0]; - const end = this.vertices[endIndex1]; + const prevEdge = this.edges[i - 1]; + const currEdge = this.edges[i]; + const begin = this.vertices[currEdge[0]]; + const end = this.vertices[currEdge[1]]; const fromColor = this.vertexStrokeColors.length > 0 ? this.vertexStrokeColors.slice( - endIndex0 * 4, - (endIndex0 + 1) * 4 + currEdge[0] * 4, + (currEdge[0] + 1) * 4 ) : [0, 0, 0, 0]; const toColor = this.vertexStrokeColors.length > 0 ? this.vertexStrokeColors.slice( - endIndex1 * 4, - (endIndex1 + 1) * 4 + currEdge[1] * 4, + (currEdge[1] + 1) * 4 ) : [0, 0, 0, 0]; const dir = end .copy() .sub(begin) .normalize(); - const a = begin.array(); - const b = begin.array(); - const c = end.array(); - const d = end.array(); - const dirAdd = dir.array(); - const dirSub = dir.array(); - // below is used to displace the pair of vertices at beginning and end - // in opposite directions - dirAdd.push(1); - dirSub.push(-1); - this.lineNormals.push(dirAdd, dirSub, dirAdd, dirAdd, dirSub, dirSub); - this.lineVertices.push(a, b, c, c, b, d); - lineColorData.push( - fromColor, fromColor, toColor, toColor, fromColor, toColor - ); + const dirOK = dir.magSq() > 0; + if (dirOK) { + this._addSegment(begin, end, fromColor, toColor, dir); + } + + if (i > 0 && prevEdge[1] === currEdge[0]) { + // Add a join if this segment shares a vertex with the previous. Skip + // actually adding join vertices if either the previous segment or this + // one has a length of 0. + // + // Don't add a join if the tangents point in the same direction, which + // would mean the edges line up exactly, and there is no need for a join. + if (lastValidDir && dirOK && dir.dot(lastValidDir) < 1 - 1e-8) { + this._addJoin(begin, lastValidDir, dir, fromColor); + } + if (dirOK && !addedStartingCap && !closed) { + this._addCap(begin, dir.copy().mult(-1), fromColor); + addedStartingCap = true; + } + } else { + addedStartingCap = false; + // Start a new line + if (dirOK && (!closed || i > 0)) { + this._addCap(begin, dir.copy().mult(-1), fromColor); + addedStartingCap = true; + } + if (lastValidDir && (!closed || i < this.edges.length - 1)) { + // Close off the last segment with a cap + this._addCap(this.vertices[prevEdge[1]], lastValidDir, fromColor); + lastValidDir = undefined; + } + } + + if (i === this.edges.length - 1) { + if (closed) { + this._addJoin( + end, + dir, + this.vertices[this.edges[0][1]] + .copy() + .sub(end) + .normalize(), + toColor + ); + } else { + this._addCap(end, dir, toColor); + } + } + + if (dirOK) { + lastValidDir = dir; + } + } + return this; +}; + +/** + * Adds the vertices and vertex attributes for two triangles making a rectangle + * for a straight line segment. A vertex shader is responsible for picking + * proper coordinates on the screen given the centerline positions, the tangent, + * and the side of the centerline each vertex belongs to. Sides follow the + * following scheme: + * + * -1 -1 + * o-------------o + * | | + * o-------------o + * 1 1 + * + * @private + * @chainable + */ +p5.Geometry.prototype._addSegment = function( + begin, + end, + fromColor, + toColor, + dir +) { + const a = begin.array(); + const b = end.array(); + const dirArr = dir.array(); + this.lineSides.push(1, -1, 1, 1, -1, -1); + for (const tangents of [this.lineTangentsIn, this.lineTangentsOut]) { + tangents.push(dirArr, dirArr, dirArr, dirArr, dirArr, dirArr); + } + this.lineVertices.push(a, a, b, b, a, b); + this.lineVertexColors.push( + fromColor, + fromColor, + toColor, + toColor, + fromColor, + toColor + ); + return this; +}; + +/** + * Adds the vertices and vertex attributes for two triangles representing the + * stroke cap of a line. A fragment shader is responsible for displaying the + * appropriate cap style within the rectangle they make. + * + * The lineSides buffer will include the following values for the points on + * the cap rectangle: + * + * -1 -2 + * -----------o---o + * | | + * -----------o---o + * 1 2 + * @private + * @chainable + */ +p5.Geometry.prototype._addCap = function(point, tangent, color) { + const ptArray = point.array(); + const tanInArray = tangent.array(); + const tanOutArray = [0, 0, 0]; + for (let i = 0; i < 6; i++) { + this.lineVertices.push(ptArray); + this.lineTangentsIn.push(tanInArray); + this.lineTangentsOut.push(tanOutArray); + this.lineVertexColors.push(color); + } + this.lineSides.push(-1, -2, 2, 2, 1, -1); + return this; +}; + +/** + * Adds the vertices and vertex attributes for four triangles representing a + * join between two adjacent line segments. This creates a quad on either side + * of the shared vertex of the two line segments, with each quad perpendicular + * to the lines. A vertex shader will discard all but the quad in the "elbow" of + * the join, and a fragment shader will display the appropriate join style + * within the remaining quad. + * + * The lineSides buffer will include the following values for the points on + * the join rectangles: + * + * -1 -2 + * -------------o----o + * | | + * 1 o----o----o -3 + * | | 0 | + * --------o----o | + * 2| 3 | + * | | + * | | + * @private + * @chainable + */ +p5.Geometry.prototype._addJoin = function( + point, + fromTangent, + toTangent, + color +) { + const ptArray = point.array(); + const tanInArray = fromTangent.array(); + const tanOutArray = toTangent.array(); + for (let i = 0; i < 12; i++) { + this.lineVertices.push(ptArray); + this.lineTangentsIn.push(tanInArray); + this.lineTangentsOut.push(tanOutArray); + this.lineVertexColors.push(color); + } + for (const side of [-1, 1]) { + this.lineSides.push(side, 2 * side, 3 * side, side, 3 * side, 0); } - this.lineVertexColors = lineColorData; return this; }; diff --git a/src/webgl/p5.RendererGL.Immediate.js b/src/webgl/p5.RendererGL.Immediate.js index 2eac808a8a..a8900579ac 100644 --- a/src/webgl/p5.RendererGL.Immediate.js +++ b/src/webgl/p5.RendererGL.Immediate.js @@ -413,6 +413,11 @@ p5.RendererGL.prototype._drawImmediateFill = function() { */ p5.RendererGL.prototype._drawImmediateStroke = function() { const gl = this.GL; + + const faceCullingEnabled = gl.isEnabled(gl.CULL_FACE); + // Prevent strokes from getting removed by culling + gl.disable(gl.CULL_FACE); + const shader = this._getImmediateStrokeShader(); this._useLineColor = (this.immediateMode.geometry.vertexStrokeColors.length > 0); @@ -426,6 +431,9 @@ p5.RendererGL.prototype._drawImmediateStroke = function() { 0, this.immediateMode.geometry.lineVertices.length ); + if (faceCullingEnabled) { + gl.enable(gl.CULL_FACE); + } shader.unbindShader(); }; diff --git a/src/webgl/p5.RendererGL.Retained.js b/src/webgl/p5.RendererGL.Retained.js index 3efe28d70b..35a7ecd3c6 100644 --- a/src/webgl/p5.RendererGL.Retained.js +++ b/src/webgl/p5.RendererGL.Retained.js @@ -118,6 +118,9 @@ p5.RendererGL.prototype.drawBuffers = function(gId) { const geometry = this.retainedMode.geometry[gId]; if (this._doStroke && geometry.lineVertexCount > 0) { + const faceCullingEnabled = gl.isEnabled(gl.CULL_FACE); + // Prevent strokes from getting removed by culling + gl.disable(gl.CULL_FACE); const strokeShader = this._getRetainedStrokeShader(); this._useLineColor = (geometry.model.vertexStrokeColors.length > 0); this._setStrokeUniforms(strokeShader); @@ -126,6 +129,9 @@ p5.RendererGL.prototype.drawBuffers = function(gId) { } this._applyColorBlend(this.curStrokeColor); this._drawArrays(gl.TRIANGLES, gId); + if (faceCullingEnabled) { + gl.enable(gl.CULL_FACE); + } strokeShader.unbindShader(); } diff --git a/src/webgl/p5.RendererGL.js b/src/webgl/p5.RendererGL.js old mode 100755 new mode 100644 index 1fe71400c0..eb929b943d --- a/src/webgl/p5.RendererGL.js +++ b/src/webgl/p5.RendererGL.js @@ -8,6 +8,27 @@ import './p5.Matrix'; import { readFileSync } from 'fs'; import { join } from 'path'; +const STROKE_CAP_ENUM = {}; +const STROKE_JOIN_ENUM = {}; +let lineDefs = ''; +const defineStrokeCapEnum = function(key, val) { + lineDefs += `#define STROKE_CAP_${key} ${val}\n`; + STROKE_CAP_ENUM[constants[key]] = val; +}; +const defineStrokeJoinEnum = function(key, val) { + lineDefs += `#define STROKE_JOIN_${key} ${val}\n`; + STROKE_JOIN_ENUM[constants[key]] = val; +}; + +// Define constants in line shaders for each type of cap/join, and also record +// the values in JS objects +defineStrokeCapEnum('ROUND', 0); +defineStrokeCapEnum('PROJECT', 1); +defineStrokeCapEnum('SQUARE', 2); +defineStrokeJoinEnum('ROUND', 0); +defineStrokeJoinEnum('MITER', 1); +defineStrokeJoinEnum('BEVEL', 2); + const lightingShader = readFileSync( join(__dirname, '/shaders/lighting.glsl'), 'utf-8' @@ -42,8 +63,10 @@ const defaultShaders = { readFileSync(join(__dirname, '/shaders/phong.frag'), 'utf-8'), fontVert: readFileSync(join(__dirname, '/shaders/font.vert'), 'utf-8'), fontFrag: readFileSync(join(__dirname, '/shaders/font.frag'), 'utf-8'), - lineVert: readFileSync(join(__dirname, '/shaders/line.vert'), 'utf-8'), - lineFrag: readFileSync(join(__dirname, '/shaders/line.frag'), 'utf-8'), + lineVert: + lineDefs + readFileSync(join(__dirname, '/shaders/line.vert'), 'utf-8'), + lineFrag: + lineDefs + readFileSync(join(__dirname, '/shaders/line.frag'), 'utf-8'), pointVert: readFileSync(join(__dirname, '/shaders/point.vert'), 'utf-8'), pointFrag: readFileSync(join(__dirname, '/shaders/point.frag'), 'utf-8') }; @@ -152,8 +175,10 @@ p5.RendererGL = function(elt, pInst, isMainCanvas, attr) { buffers: { stroke: [ new p5.RenderBuffer(4, 'lineVertexColors', 'lineColorBuffer', 'aVertexColor', this, this._flatten), - new p5.RenderBuffer(3, 'lineVertices', 'lineVertexBuffer', 'aPosition', this, this._flatten), - new p5.RenderBuffer(4, 'lineNormals', 'lineNormalBuffer', 'aDirection', this, this._flatten) + new p5.RenderBuffer(3, 'lineVertices', 'lineVerticesBuffer', 'aPosition', this, this._flatten), + new p5.RenderBuffer(3, 'lineTangentsIn', 'lineTangentsInBuffer', 'aTangentIn', this, this._flatten), + new p5.RenderBuffer(3, 'lineTangentsOut', 'lineTangentsOutBuffer', 'aTangentOut', this, this._flatten), + new p5.RenderBuffer(1, 'lineSides', 'lineSidesBuffer', 'aSide', this) ], fill: [ new p5.RenderBuffer(3, 'vertices', 'vertexBuffer', 'aPosition', this, this._vToNArray), @@ -188,8 +213,10 @@ p5.RendererGL = function(elt, pInst, isMainCanvas, attr) { ], stroke: [ new p5.RenderBuffer(4, 'lineVertexColors', 'lineColorBuffer', 'aVertexColor', this, this._flatten), - new p5.RenderBuffer(3, 'lineVertices', 'lineVertexBuffer', 'aPosition', this, this._flatten), - new p5.RenderBuffer(4, 'lineNormals', 'lineNormalBuffer', 'aDirection', this, this._flatten) + new p5.RenderBuffer(3, 'lineVertices', 'lineVerticesBuffer', 'aPosition', this, this._flatten), + new p5.RenderBuffer(3, 'lineTangentsIn', 'lineTangentsInBuffer', 'aTangentIn', this, this._flatten), + new p5.RenderBuffer(3, 'lineTangentsOut', 'lineTangentsOutBuffer', 'aTangentOut', this, this._flatten), + new p5.RenderBuffer(1, 'lineSides', 'lineSidesBuffer', 'aSide', this) ], point: this.GL.createBuffer() } @@ -197,6 +224,8 @@ p5.RendererGL = function(elt, pInst, isMainCanvas, attr) { this.pointSize = 5.0; //default point size this.curStrokeWeight = 1; + this.curStrokeCap = constants.ROUND; + this.curStrokeJoin = constants.ROUND; // array of textures created in this gl context via this.getTexture(src) this.textures = []; @@ -679,14 +708,11 @@ p5.RendererGL.prototype.stroke = function(r, g, b, a) { }; p5.RendererGL.prototype.strokeCap = function(cap) { - // @TODO : to be implemented - console.error('Sorry, strokeCap() is not yet implemented in WEBGL mode'); + this.curStrokeCap = cap; }; p5.RendererGL.prototype.strokeJoin = function(join) { - // @TODO : to be implemented - // https://processing.org/reference/strokeJoin_.html - console.error('Sorry, strokeJoin() is not yet implemented in WEBGL mode'); + this.curStrokeJoin = join; }; p5.RendererGL.prototype.filter = function(filterType) { @@ -1264,6 +1290,8 @@ p5.RendererGL.prototype._setStrokeUniforms = function(strokeShader) { strokeShader.setUniform('uUseLineColor', this._useLineColor); strokeShader.setUniform('uMaterialColor', this.curStrokeColor); strokeShader.setUniform('uStrokeWeight', this.curStrokeWeight); + strokeShader.setUniform('uStrokeCap', STROKE_CAP_ENUM[this.curStrokeCap]); + strokeShader.setUniform('uStrokeJoin', STROKE_JOIN_ENUM[this.curStrokeJoin]); }; p5.RendererGL.prototype._setFillUniforms = function(fillShader) { diff --git a/src/webgl/shaders/line.frag b/src/webgl/shaders/line.frag index 38235635df..e38e9b66ee 100644 --- a/src/webgl/shaders/line.frag +++ b/src/webgl/shaders/line.frag @@ -1,8 +1,51 @@ precision mediump float; precision mediump int; +uniform vec4 uMaterialColor; +uniform int uStrokeCap; +uniform int uStrokeJoin; +uniform float uStrokeWeight; + varying vec4 vColor; +varying vec2 vTangent; +varying vec2 vCenter; +varying vec2 vPosition; +varying float vMaxDist; +varying float vCap; +varying float vJoin; + +float distSquared(vec2 a, vec2 b) { + vec2 aToB = b - a; + return dot(aToB, aToB); +} void main() { + if (vCap > 0.) { + if ( + uStrokeCap == STROKE_CAP_ROUND && + distSquared(vPosition, vCenter) > uStrokeWeight * uStrokeWeight * 0.25 + ) { + discard; + } else if ( + uStrokeCap == STROKE_CAP_SQUARE && + dot(vPosition - vCenter, vTangent) > 0. + ) { + discard; + } + // Use full area for PROJECT + } else if (vJoin > 0.) { + if ( + uStrokeJoin == STROKE_JOIN_ROUND && + distSquared(vPosition, vCenter) > uStrokeWeight * uStrokeWeight * 0.25 + ) { + discard; + } else if (uStrokeJoin == STROKE_JOIN_BEVEL) { + vec2 normal = vec2(-vTangent.y, vTangent.x); + if (abs(dot(vPosition - vCenter, normal)) > vMaxDist) { + discard; + } + } + // Use full area for MITER + } gl_FragColor = vec4(vColor.rgb, 1.) * vColor.a; } diff --git a/src/webgl/shaders/line.vert b/src/webgl/shaders/line.vert index ef70264ab7..f167cd092d 100644 --- a/src/webgl/shaders/line.vert +++ b/src/webgl/shaders/line.vert @@ -18,6 +18,9 @@ #define PROCESSING_LINE_SHADER +precision mediump float; +precision mediump int; + uniform mat4 uModelViewMatrix; uniform mat4 uProjectionMatrix; uniform float uStrokeWeight; @@ -27,12 +30,39 @@ uniform vec4 uMaterialColor; uniform vec4 uViewport; uniform int uPerspective; +uniform int uStrokeJoin; attribute vec4 aPosition; -attribute vec4 aDirection; +attribute vec3 aTangentIn; +attribute vec3 aTangentOut; +attribute float aSide; attribute vec4 aVertexColor; varying vec4 vColor; +varying vec2 vTangent; +varying vec2 vCenter; +varying vec2 vPosition; +varying float vMaxDist; +varying float vCap; +varying float vJoin; + +vec2 lineIntersection(vec2 aPoint, vec2 aDir, vec2 bPoint, vec2 bDir) { + // Rotate and translate so a starts at the origin and goes out to the right + bPoint -= aPoint; + vec2 rotatedBFrom = vec2( + bPoint.x*aDir.x + bPoint.y*aDir.y, + bPoint.y*aDir.x - bPoint.x*aDir.y + ); + vec2 bTo = bPoint + bDir; + vec2 rotatedBTo = vec2( + bTo.x*aDir.x + bTo.y*aDir.y, + bTo.y*aDir.x - bTo.x*aDir.y + ); + float intersectionDistance = + rotatedBTo.x + (rotatedBFrom.x - rotatedBTo.x) * rotatedBTo.y / + (rotatedBTo.y - rotatedBFrom.y); + return aPoint + aDir * intersectionDistance; +} void main() { // using a scale <1 moves the lines towards the camera @@ -40,18 +70,33 @@ void main() { // the line disappearing behind the geometry faces. vec3 scale = vec3(0.9995); + // Caps have one of either the in or out tangent set to 0 + vCap = (aTangentIn == vec3(0.)) != (aTangentOut == (vec3(0.))) + ? 1. : 0.; + + // Joins have two unique, defined tangents + vJoin = ( + aTangentIn != vec3(0.) && + aTangentOut != vec3(0.) && + aTangentIn != aTangentOut + ) ? 1. : 0.; + vec4 posp = uModelViewMatrix * aPosition; - vec4 posq = uModelViewMatrix * (aPosition + vec4(aDirection.xyz, 0)); + vec4 posqIn = uModelViewMatrix * (aPosition + vec4(aTangentIn, 0)); + vec4 posqOut = uModelViewMatrix * (aPosition + vec4(aTangentOut, 0)); // Moving vertices slightly toward the camera // to avoid depth-fighting with the fill triangles. // Discussed here: // http://www.opengl.org/discussion_boards/ubbthreads.php?ubb=showflat&Number=252848 posp.xyz = posp.xyz * scale; - posq.xyz = posq.xyz * scale; + posqIn.xyz = posqIn.xyz * scale; + posqOut.xyz = posqOut.xyz * scale; vec4 p = uProjectionMatrix * posp; - vec4 q = uProjectionMatrix * posq; + vec4 qIn = uProjectionMatrix * posqIn; + vec4 qOut = uProjectionMatrix * posqOut; + vCenter = p.xy; // formula to convert from clip space (range -1..1) to screen space (range 0..[width or height]) // screen_p = (p.xy/p.w + <1,1>) * 0.5 * uViewport.zw @@ -75,16 +120,10 @@ void main() { // and corrects for aspect ratio, see https://github.com/processing/processing/issues/5181) // t = +- normalize( (q.xy*p.w - p.xy*q.w) * uViewport.zw ) - vec2 tangent = normalize((q.xy*p.w - p.xy*q.w) * uViewport.zw); - - // flip tangent to normal (it's already normalized) - vec2 normal = vec2(tangent.y, -tangent.x); - - float thickness = aDirection.w * uStrokeWeight; - vec2 offset = normal * thickness / 2.0; + vec2 tangentIn = normalize((qIn.xy*p.w - p.xy*qIn.w) * uViewport.zw); + vec2 tangentOut = normalize((qOut.xy*p.w - p.xy*qOut.w) * uViewport.zw); vec2 curPerspScale; - if(uPerspective == 1) { // Perspective --- // convert from world to clip by multiplying with projection scaling factor @@ -98,7 +137,72 @@ void main() { curPerspScale = p.w / (0.5 * uViewport.zw); } - gl_Position.xy = p.xy + offset.xy * curPerspScale; + vec2 offset; + if (vJoin == 1.) { + vTangent = normalize(tangentIn + tangentOut); + vec2 normalIn = vec2(-tangentIn.y, tangentIn.x); + vec2 normalOut = vec2(-tangentOut.y, tangentOut.x); + float side = sign(aSide); + float sideEnum = abs(aSide); + + // We generate vertices for joins on either side of the centerline, but + // the "elbow" side is the only one needing a join. By not setting the + // offset for the other side, all its vertices will end up in the same + // spot and not render, effectively discarding it. + if (sign(dot(tangentOut, vec2(-tangentIn.y, tangentIn.x))) != side) { + // Side enums: + // 1: the side going into the join + // 2: the middle of the join + // 3: the side going out of the join + if (sideEnum == 2.) { + // Calculate the position + tangent on either side of the join, and + // find where the lines intersect to find the elbow of the join + vec2 c = (posp.xy/posp.w + vec2(1.,1.)) * 0.5 * uViewport.zw; + vec2 intersection = lineIntersection( + c + (side * normalIn * uStrokeWeight / 2.) * curPerspScale, + tangentIn, + c + (side * normalOut * uStrokeWeight / 2.) * curPerspScale, + tangentOut + ); + offset = (intersection - c); + + // When lines are thick and the angle of the join approaches 180, the + // elbow might be really far from the center. We'll apply a limit to + // the magnitude to avoid lines going across the whole screen when this + // happens. + float mag = length(offset); + float maxMag = 3. * uStrokeWeight; + if (mag > maxMag) { + offset *= maxMag / mag; + } + } else if (sideEnum == 1.) { + offset = side * normalIn * curPerspScale * uStrokeWeight / 2.; + } else if (sideEnum == 3.) { + offset = side * normalOut * curPerspScale * uStrokeWeight / 2.; + } + } + if (uStrokeJoin == STROKE_JOIN_BEVEL) { + vec2 avgNormal = vec2(-vTangent.y, vTangent.x); + vMaxDist = abs(dot(avgNormal, normalIn * uStrokeWeight / 2.)); + } else { + vMaxDist = uStrokeWeight / 2.; + } + } else { + vec2 tangent = aTangentIn == vec3(0.) ? tangentOut : tangentIn; + vTangent = tangent; + vec2 normal = vec2(-tangent.y, tangent.x); + + float normalOffset = sign(aSide); + // Caps will have side values of -2 or 2 on the edge of the cap that + // extends out from the line + float tangentOffset = abs(aSide) - 1.; + offset = (normal * normalOffset + tangent * tangentOffset) * + uStrokeWeight * 0.5 * curPerspScale; + vMaxDist = uStrokeWeight / 2.; + } + vPosition = vCenter + offset / curPerspScale; + + gl_Position.xy = p.xy + offset.xy; gl_Position.zw = p.zw; vColor = (uUseLineColor ? aVertexColor : uMaterialColor); diff --git a/test/unit/spec.js b/test/unit/spec.js index 6f058e4547..bdab58870e 100644 --- a/test/unit/spec.js +++ b/test/unit/spec.js @@ -41,6 +41,7 @@ var spec = { 'interaction', 'p5.Matrix', 'p5.Camera', + 'p5.Geometry', 'p5.RendererGL', 'p5.Shader', 'p5.Texture', diff --git a/test/unit/webgl/p5.Geometry.js b/test/unit/webgl/p5.Geometry.js new file mode 100644 index 0000000000..64b9b03a82 --- /dev/null +++ b/test/unit/webgl/p5.Geometry.js @@ -0,0 +1,147 @@ +suite('p5.Geometry', function() { + let myp5; + + if (!window.Modernizr.webgl) { + return; + } + + setup(function() { + myp5 = new p5(function(p) { + p.setup = function() {}; + p.draw = function() {}; + }); + }); + + teardown(function() { + myp5.remove(); + }); + + suite('generating edge geometry', function() { + let geom; + + setup(function() { + geom = new p5.Geometry(); + sinon.spy(geom, '_addCap'); + sinon.spy(geom, '_addJoin'); + sinon.spy(geom, '_addSegment'); + }); + + teardown(function() { + geom._addCap.restore(); + geom._addJoin.restore(); + geom._addSegment.restore(); + }); + + test('single polyline', function() { + geom.vertices.push( + myp5.createVector(0, 0), + myp5.createVector(0, 100), + myp5.createVector(100, 100), + myp5.createVector(100, 0) + ); + geom.edges.push([0, 1], [1, 2], [2, 3]); + geom._edgesToVertices(); + + assert.equal(geom._addSegment.callCount, 3); + assert.equal(geom._addCap.callCount, 2); + assert.equal(geom._addJoin.callCount, 2); + }); + + test('straight line', function() { + geom.vertices.push( + myp5.createVector(0, 0), + myp5.createVector(0, 100), + myp5.createVector(0, 200) + ); + geom.edges.push([0, 1], [1, 2]); + geom._edgesToVertices(); + + assert.equal(geom._addSegment.callCount, 2); + assert.equal(geom._addCap.callCount, 2); + // No joins since the directions of each segment are the same + assert.equal(geom._addJoin.callCount, 0); + }); + + test('two disconnected polylines', function() { + geom.vertices.push( + myp5.createVector(0, 0), + myp5.createVector(0, 100), + myp5.createVector(100, 100), + myp5.createVector(100, 0) + ); + geom.edges.push([0, 1], [2, 3]); + geom._edgesToVertices(); + + assert.equal(geom._addSegment.callCount, 2); + assert.equal(geom._addCap.callCount, 4); + assert.equal(geom._addJoin.callCount, 0); + }); + + test('polyline that loops back', function() { + geom.vertices.push( + myp5.createVector(0, 0), + myp5.createVector(0, 100), + myp5.createVector(100, 100), + myp5.createVector(100, 0) + ); + geom.edges.push([0, 1], [1, 2], [2, 3], [3, 0]); + geom._edgesToVertices(); + + assert.equal(geom._addSegment.callCount, 4); + assert.equal(geom._addCap.callCount, 0); + assert.equal(geom._addJoin.callCount, 4); + }); + + test('degenerate edge in the middle', function() { + geom.vertices.push( + myp5.createVector(0, 0), + myp5.createVector(0, 100), + myp5.createVector(0, 100), + myp5.createVector(100, 100), + myp5.createVector(100, 0) + ); + geom.edges.push([0, 1], [1, 2], [2, 3], [3, 4]); + geom._edgesToVertices(); + + // The degenerate edge should be skipped without breaking the + // polyline into multiple pieces + assert.equal(geom._addSegment.callCount, 3); + assert.equal(geom._addCap.callCount, 2); + assert.equal(geom._addJoin.callCount, 2); + }); + + test('degenerate edge at the end', function() { + geom.vertices.push( + myp5.createVector(0, 0), + myp5.createVector(0, 100), + myp5.createVector(100, 100), + myp5.createVector(100, 0), + myp5.createVector(100, 0) + ); + geom.edges.push([0, 1], [1, 2], [2, 3], [3, 4]); + geom._edgesToVertices(); + + // The degenerate edge should be skipped and caps should still be added + // from the previous non degenerate edge + assert.equal(geom._addSegment.callCount, 3); + assert.equal(geom._addCap.callCount, 2); + assert.equal(geom._addJoin.callCount, 2); + }); + + test('degenerate edge between two disconnected polylines', function() { + geom.vertices.push( + myp5.createVector(0, 0), + myp5.createVector(0, 100), + myp5.createVector(0, 100), + myp5.createVector(100, 100), + myp5.createVector(100, 0) + ); + geom.edges.push([0, 1], [1, 2], [3, 4]); + geom._edgesToVertices(); + + assert.equal(geom._addSegment.callCount, 2); + assert.equal(geom._addCap.callCount, 4); + assert.equal(geom._addJoin.callCount, 0); + }); + }); +}); diff --git a/test/unit/webgl/p5.RendererGL.js b/test/unit/webgl/p5.RendererGL.js index eb8a981774..0cb8edd0c2 100644 --- a/test/unit/webgl/p5.RendererGL.js +++ b/test/unit/webgl/p5.RendererGL.js @@ -572,12 +572,19 @@ suite('p5.RendererGL', function() { assert.isDefined(buffers.indexBuffer); assert.isDefined(buffers.indexBufferType); assert.isDefined(buffers.vertexBuffer); - assert.isDefined(buffers.lineNormalBuffer); - assert.isDefined(buffers.lineVertexBuffer); + assert.isDefined(buffers.lineVerticesBuffer); + assert.isDefined(buffers.lineSidesBuffer); + assert.isDefined(buffers.lineTangentsInBuffer); + assert.isDefined(buffers.lineTangentsOutBuffer); assert.isDefined(buffers.vertexBuffer); assert.equal(buffers.vertexCount, 3); - assert.equal(buffers.lineVertexCount, 18); + + // 6 verts per line segment x3 (each is a quad made of 2 triangles) + // + 12 verts per join x3 (2 quads each, 1 is discarded in the shader) + // + 6 verts per line cap x0 (1 quad each) + // = 54 + assert.equal(buffers.lineVertexCount, 54); done(); });