Android Open Source - Schooner-3D Shader Lib

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License

The source code is released under:

Apache License

Java Source Code

/*
 * Copyright 2012 Dan Mercer//from  www.  j av a  2 s .  co m
 * 
 * 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.
 */

package com.supermercerbros.gameengine.engine.shaders;

import java.util.LinkedList;

import android.util.Log;

public class ShaderLib {
  private static final String TAG = ShaderLib.class.getSimpleName();
  
  public static final String A_POS = "a_pos";
  public static final String A_NORMAL = "a_normal";
  public static final String A_MTL = "a_mtl";
  
  public static final String U_MODEL = "u_model";
  public static final String U_MATRICES = "u_matrices";
  
  public static final String U_LIGHTVEC = "u_lightVec";
  public static final String U_LIGHTCOLOR = "u_lightColor";
  public static final String U_VIEWPROJ = "u_viewProj";
  
  public static final String S_BASEMAP = "s_baseMap";
  
  private static LinkedList<Program> programs;
  private static LinkedList<Shader> shaders;
  private static boolean initialized = false;
  
  /**
   * Initializes the ShaderLib.
   */
  public static void init() {
    if (initialized) {
      Log.e(TAG, "ShaderLib.init() was called when already initialized.");
      return;
    }
    initialized = true;
    programs = new LinkedList<Program>();
    shaders = new LinkedList<Shader>();
  }
  
  public static synchronized void close() {
    if (initialized) {
      initialized = false;
      programs.clear();
      programs = null;
      shaders.clear();
      shaders = null;
      Log.d(TAG, "ShaderLib is now closed.");
    } else {
      Log.e(TAG, "ShaderLib.close() was called before init()");
    }
  }
  
  /**
   * Returns an OpenGL program with the given shaders. If a matching program
   * already exists, returns that one instead.
   * 
   * @param vertShader
   * @param fragShader
   * @return
   */
  public static synchronized Program newProgram(String vertShader,
      String fragShader) {
    Shader vert = null, frag = null;
    for (Shader s : shaders) {
      if (s.source.equals(vertShader)) {
        vert = s;
      } else if (s.source.equals(fragShader)) {
        frag = s;
      }
      
      if (vert != null && frag != null) {
        break;
      }
    }
    
    if (vert != null && frag != null) {
      for (Program p : programs) {
        if (p.fragment == frag && p.vertex == vert) {
          return p;
        }
      }
    }
    if (vert == null) {
      vert = new Shader(vertShader);
      shaders.add(vert);
    }
    if (frag == null) {
      frag = new Shader(fragShader);
      shaders.add(frag);
    }
    
    final Program program = new Program(vert, frag);
    programs.add(program);
    return program;
  }
  
}

Java Source Code List

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