1 /******************************************************************************* 2 * Copyright 2011 See AUTHORS file. 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 ******************************************************************************/ 16 17 package com.badlogic.gdx.graphics.g3d.attributes; 18 19 import com.badlogic.gdx.graphics.GL20; 20 import com.badlogic.gdx.graphics.g3d.Attribute; 21 import com.badlogic.gdx.math.MathUtils; 22 import com.badlogic.gdx.utils.NumberUtils; 23 24 public class BlendingAttribute extends Attribute { 25 public final static String Alias = "blended"; 26 public final static long Type = register(Alias); 27 28 public final static boolean is (final long mask) { 29 return (mask & Type) == mask; 30 } 31 32 /** Whether this material should be considered blended (default: true). This is used for sorting (back to front instead of front 33 * to back). */ 34 public boolean blended; 35 /** Specifies how the (incoming) red, green, blue, and alpha source blending factors are computed (default: GL_SRC_ALPHA) */ 36 public int sourceFunction; 37 /** Specifies how the (existing) red, green, blue, and alpha destination blending factors are computed (default: 38 * GL_ONE_MINUS_SRC_ALPHA) */ 39 public int destFunction; 40 /** The opacity used as source alpha value, ranging from 0 (fully transparent) to 1 (fully opaque), (default: 1). */ 41 public float opacity = 1.f; 42 43 public BlendingAttribute () { 44 this(null); 45 } 46 47 public BlendingAttribute (final boolean blended, final int sourceFunc, final int destFunc, final float opacity) { 48 super(Type); 49 this.blended = blended; 50 this.sourceFunction = sourceFunc; 51 this.destFunction = destFunc; 52 this.opacity = opacity; 53 } 54 55 public BlendingAttribute (final int sourceFunc, final int destFunc, final float opacity) { 56 this(true, sourceFunc, destFunc, opacity); 57 } 58 59 public BlendingAttribute (final int sourceFunc, final int destFunc) { 60 this(sourceFunc, destFunc, 1.f); 61 } 62 63 public BlendingAttribute (final boolean blended, final float opacity) { 64 this(blended, GL20.GL_SRC_ALPHA, GL20.GL_ONE_MINUS_SRC_ALPHA, opacity); 65 } 66 67 public BlendingAttribute (final float opacity) { 68 this(true, opacity); 69 } 70 71 public BlendingAttribute (final BlendingAttribute copyFrom) { 72 this(copyFrom == null ? true : copyFrom.blended, copyFrom == null ? GL20.GL_SRC_ALPHA : copyFrom.sourceFunction, 73 copyFrom == null ? GL20.GL_ONE_MINUS_SRC_ALPHA : copyFrom.destFunction, copyFrom == null ? 1.f : copyFrom.opacity); 74 } 75 76 @Override 77 public BlendingAttribute copy () { 78 return new BlendingAttribute(this); 79 } 80 81 @Override 82 public int hashCode () { 83 int result = super.hashCode(); 84 result = 947 * result + (blended ? 1 : 0); 85 result = 947 * result + sourceFunction; 86 result = 947 * result + destFunction; 87 result = 947 * result + NumberUtils.floatToRawIntBits(opacity); 88 return result; 89 } 90 91 @Override 92 public int compareTo (Attribute o) { 93 if (type != o.type) return (int)(type - o.type); 94 BlendingAttribute other = (BlendingAttribute)o; 95 if (blended != other.blended) return blended ? 1 : -1; 96 if (sourceFunction != other.sourceFunction) return sourceFunction - other.sourceFunction; 97 if (destFunction != other.destFunction) return destFunction - other.destFunction; 98 return (MathUtils.isEqual(opacity, other.opacity)) ? 0 : (opacity < other.opacity ? 1 : -1); 99 } 100 } 101
