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package nz.gen.geek_central.GLUseful; /*/* w w w . j av a 2 s . co m*/ Easy construction of objects with a single axis of rotational symmetry, building on GeomBuilder. Copyright 2011-2013 by Lawrence D'Oliveiro <ldo@geek-central.gen.nz>. Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. */ public class Lathe { public interface VertexFunc { public Vec3f Get ( int PointIndex ); } public interface VectorFunc { public Vec3f Get ( int PointIndex, int SectorIndex, /* 0 .. NrSectors - 1 */ boolean Upper /* indicates which of two calls for each point (except for start and end points, which only get one call each) to allow for discontiguous shading */ ); } /*VectorFunc*/ public interface ColorFunc { public GLUseful.Color Get ( int PointIndex, int SectorIndex, /* 0 .. NrSectors - 1 */ boolean Upper /* indicates which of two calls for each point (except for start and end points, which only get one call each) to allow for discontiguous shading */ ); } /*ColorFunc*/ public static GeomBuilder.Obj Make ( boolean Shaded, /* false for wireframe */ VertexFunc Point, /* returns outline of object, must be at least 3 points, all Z coords must be zero, all X coords non-negative, and X coord of first and last point must be zero. Order the points by decreasing Y coord if you want anticlockwise face vertex ordering, or increasing if you want clockwise. */ int NrPoints, /* valid values for arg to Point.Get are [0 .. NrPoints - 1] */ VectorFunc Normal, /* optional to compute normal vector at each point */ VectorFunc TexCoord, /* optional to compute texture coordinate at each point */ ColorFunc VertexColor, /* optional to compute colour at each point */ int NrSectors, /* must be at least 3 */ GLUseful.ShaderVarDef[] Uniforms, /* optional additional uniform variable definitions for vertex shader */ String VertexColorCalc, /* optional, compiled as part of vertex shader to implement lighting etc, must assign value to "frag_color" variable */ boolean BindNow /* true to do GL calls now, false to defer to later call to Bind or Draw */ ) /* rotates Points around Y axis with NrSectors steps, invoking the specified callbacks to obtain normal vectors, texture coordinates and vertex colours as appropriate, and returns the constructed geometry object. */ { final GeomBuilder Geom = new GeomBuilder ( /*Shaded =*/ Shaded, /*GotNormals =*/ Normal != null, /*GotTexCoords =*/ TexCoord != null, /*GotColors =*/ VertexColor != null ); final int[] PrevInds = new int[NrPoints * 2 - 2]; final int[] FirstInds = new int[NrPoints * 2 - 2]; final int[] TheseInds = new int[NrPoints * 2 - 2]; for (int i = 0;;) { if (i < NrSectors) { final float Angle = (float)(2.0 * Math.PI * i / NrSectors); final float Cos = (float)Math.cos(Angle); final float Sin = (float)Math.sin(Angle); for (int j = 0; j < NrPoints; ++j) { final Vec3f Vertex = Point.Get(j); final Vec3f ThisPoint = new Vec3f ( Vertex.x * Cos, Vertex.y, Vertex.x * Sin ); if (j < NrPoints - 1) { final Vec3f ThisNormal = Normal != null ? Normal.Get(j, i, true) : null; final Vec3f ThisTexCoord = TexCoord != null ? TexCoord.Get(j, i, true) : null; final GLUseful.Color ThisColor = VertexColor != null ? VertexColor.Get(j, i, true) : null; TheseInds[j * 2] = Geom.Add(ThisPoint, ThisNormal, ThisTexCoord, ThisColor); } /*if*/ if (j > 0) { final Vec3f ThisNormal = Normal != null ? Normal.Get(j, i, false) : null; final Vec3f ThisTexCoord = TexCoord != null ? TexCoord.Get(j, i, false) : null; final GLUseful.Color ThisColor = VertexColor != null ? VertexColor.Get(j, i, false) : null; TheseInds[j * 2 - 1] = Geom.Add(ThisPoint, ThisNormal, ThisTexCoord, ThisColor); } /*if*/ } /*for*/ } else { for (int j = 0; j < TheseInds.length; ++j) { TheseInds[j] = FirstInds[j]; } /*for*/ } /*if*/ if (i != 0) { Geom.AddTri(PrevInds[1], TheseInds[0], TheseInds[1]); for (int j = 1; j < NrPoints - 1; ++j) { Geom.AddQuad ( PrevInds[j * 2 + 1], PrevInds[j * 2], TheseInds[j * 2], TheseInds[j * 2 + 1] ); } /*for*/ Geom.AddTri ( PrevInds[TheseInds.length - 2], TheseInds[TheseInds.length - 2], TheseInds[TheseInds.length - 1] ); } else { for (int j = 0; j < TheseInds.length; ++j) { FirstInds[j] = TheseInds[j]; } /*for*/ } /*if*/ for (int j = 0; j < TheseInds.length; ++j) { PrevInds[j] = TheseInds[j]; } /*for*/ if (i == NrSectors) break; ++i; } /*for*/ return Geom.MakeObj(Uniforms, VertexColorCalc, BindNow); } /*Make*/ } /*Lathe*/;