Android Open Source - Schooner-3D Binary Skeletal Vertex Modifier

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License

The source code is released under:

Apache License

Java Source Code

/*
 * Copyright 2013 Dan Mercer// w w w .ja va  2  s . c  o  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.armature;

import java.util.Locale;

import android.opengl.GLES20;

import com.supermercerbros.gameengine.engine.shaders.Material;
import com.supermercerbros.gameengine.engine.shaders.Program;
import com.supermercerbros.gameengine.engine.shaders.VertexModifier;
import com.supermercerbros.gameengine.objects.BonedObject;
import com.supermercerbros.gameengine.objects.GameObject;

/**
 * A VertexModifier that is optimized for single-bone (binary) vertex weights.
 */
public class BinarySkeletalVertexModifier extends VertexModifier {
  
  // VARIABLES
  private static final String VARS = 
      "uniform mat4 u_matrices[%d];\n" +
      "attribute float a_index;\n";
  
  // CODE SNIPPETS
  private static final String POS_CODE = 
      "vec4 a_pos4 = vec4(a_pos.xyz, 1.0);\n" +
      "vec3 mod_pos = (u_matrices[int(a_index)] * a_pos4).xyz;\n";
  private static final String NORMAL_CODE = 
      "vec4 a_normal4 = vec4(a_normal.xyz, 0.0);\n" +
      "vec3 mod_normal = (u_matrices[int(a_index)] * a_normal4).xyz;\n";
  
  
  private final int boneCount;
  
  private int a_index = -1;
  
  /**
   * Constructs a new BinarySkeletalVertexModifier
   */
  public BinarySkeletalVertexModifier(int boneCount) {
    this.boneCount = boneCount;
  }
  
  @Override
  public void onLoadObject(Material mtl, GameObject object, float[] vbo) {
    BonedObject bo = (BonedObject) object;
    mtl.loadArrayToVbo(bo.boneIndices, vbo, 1, object.info.count);
  }
  
  @Override
  public void onAttachAttribs(Material mtl, Program program) {
    if (a_index == -1) {
      a_index = program.getAttribLocation("a_index");
    }
    mtl.attachAttrib(a_index, 1, GLES20.GL_BYTE);
  }
  
  // Getters =================================
  
  @Override
  public void getVars(StringBuilder sb) {
    sb.append(String.format(Locale.US, VARS, boneCount));
  }
  
  @Override
  public void getCode(StringBuilder sb) {
    sb.append(POS_CODE);
    if (containsNormalAttrib(sb)) {
      sb.append(NORMAL_CODE);
    }
  }
  
  @Override
  public void getMethods(StringBuilder sb) {
    // No methods for this modifier
  }
  
  @Override
  public int getStride() {
    return 1;
  }
  
}

Java Source Code List

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