Android Open Source - droidengine2d Color Material Batch Renderer

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License

The source code is released under:

Apache License

Java Source Code

/*   Copyright 2013-2014 Miguel Vicente Linares
 */*from w  w w  . ja va2s.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.miviclin.droidengine2d.graphics.mesh;

import static com.miviclin.droidengine2d.util.PrimitiveTypeSize.SIZE_OF_FLOAT;

import java.nio.FloatBuffer;
import java.util.ArrayList;

import com.miviclin.droidengine2d.graphics.Color;
import com.miviclin.droidengine2d.graphics.cameras.Camera;
import com.miviclin.droidengine2d.graphics.material.ColorMaterial;
import com.miviclin.droidengine2d.graphics.shader.ShaderProgram;
import com.miviclin.droidengine2d.graphics.shader.ShaderVars;
import com.miviclin.droidengine2d.util.math.Vector2;
import com.miviclin.droidengine2d.util.math.Vector3;

/**
 * ColorMaterialBatchRenderer allows rendering batches of up to 32 rectangles with ColorMaterial in one draw call. Each
 * rectangle has its own translation, rotation and scale.
 * 
 * @author Miguel Vicente Linares
 * 
 */
public class ColorMaterialBatchRenderer<M extends ColorMaterial> extends RectangleBatchRenderer<M> {

  private int vertexPositionOffset;
  private int vertexColorOffset;

  /**
   * Creates a new ColorMaterialBatchRenderer.
   */
  public ColorMaterialBatchRenderer() {
    super(7, 32);
    setVerticesDataStride(7);
    this.vertexPositionOffset = 0;
    this.vertexColorOffset = 3;
    setGeometry(new RectangleBatchGeometry(32, true, false));
  }

  @Override
  public void setupShaderProgram() {

    // @formatter:off
    
    String vertexShaderSource = "" +
        "uniform mat4 " + ShaderVars.U_MVP_MATRIX + "[32];\n" +
        "attribute float " + ShaderVars.A_MVP_MATRIX_INDEX + ";\n" +
        "attribute vec4 " + ShaderVars.A_POSITION + ";\n" +
        "attribute vec4 " + ShaderVars.A_COLOR + ";\n" +
        "varying vec4 " + ShaderVars.V_COLOR + ";\n" +
        "void main() {\n" +
        "    gl_Position = " + ShaderVars.U_MVP_MATRIX + "[int(" + ShaderVars.A_MVP_MATRIX_INDEX + ")] * " + ShaderVars.A_POSITION + ";\n" +
        "    " + ShaderVars.V_COLOR + " = " + ShaderVars.A_COLOR + ";\n" +
        "}";

    String fragmentShaderSource = "" +
        "precision mediump float;\n" +
        "varying vec4 " + ShaderVars.V_COLOR + ";\n" +
        "void main() {\n" +
        "    gl_FragColor = " + ShaderVars.V_COLOR + ";\n" +
        "}";
    
    // @formatter:on

    ArrayList<String> attributes = new ArrayList<String>();
    attributes.add(ShaderVars.A_MVP_MATRIX_INDEX);
    attributes.add(ShaderVars.A_POSITION);
    attributes.add(ShaderVars.A_COLOR);

    ArrayList<String> uniforms = new ArrayList<String>();
    uniforms.add(ShaderVars.U_MVP_MATRIX);

    getShaderProgram().setShaders(vertexShaderSource, fragmentShaderSource, attributes, uniforms);
  }

  @Override
  protected void setupVertexShaderVariables(int batchSize) {
    int strideBytes = getVerticesDataStrideBytes();
    ShaderProgram shaderProgram = getShaderProgram();
    shaderProgram.setUniformMatrix4fv(ShaderVars.U_MVP_MATRIX, batchSize, getGeometry().getMvpMatrices(), 0);
    shaderProgram.setAttribute(ShaderVars.A_MVP_MATRIX_INDEX, 1, SIZE_OF_FLOAT, getMvpIndexBuffer(), 0);
    shaderProgram.setAttribute(ShaderVars.A_POSITION, 3, strideBytes, getVertexBuffer(), vertexPositionOffset);
    shaderProgram.setAttribute(ShaderVars.A_COLOR, 4, strideBytes, getVertexBuffer(), vertexColorOffset);
  }

  @Override
  protected void copyGeometryToVertexBuffer(int batchSize) {
    FloatBuffer vertexBuffer = getVertexBuffer();
    vertexBuffer.clear();
    int nVertices = getBatchCapacity() * 4;
    Vector3 position;
    Color color;
    for (int i = 0; i < nVertices; i++) {
      position = getGeometry().getVertex(i);
      vertexBuffer.put(position.getX());
      vertexBuffer.put(position.getY());
      vertexBuffer.put(position.getZ());

      color = getGeometry().getColor(i);
      vertexBuffer.put(color.getR());
      vertexBuffer.put(color.getG());
      vertexBuffer.put(color.getB());
      vertexBuffer.put(color.getA());
    }
  }

  @Override
  protected void setupVerticesData() {
    RectangleBatchGeometry geometry = getGeometry();
    int nVertices = getBatchCapacity() * 4;
    for (int i = 0; i < nVertices; i++) {
      // Bottom-Left
      geometry.addVertex(new Vector3(-0.5f, -0.5f, 0.0f));
      geometry.addColor(new Color(1.0f, 1.0f, 1.0f, 1.0f));
      // Bottom-Right
      geometry.addVertex(new Vector3(0.5f, -0.5f, 0.0f));
      geometry.addColor(new Color(1.0f, 1.0f, 1.0f, 1.0f));
      // Top-Right
      geometry.addVertex(new Vector3(0.5f, 0.5f, 0.0f));
      geometry.addColor(new Color(1.0f, 1.0f, 1.0f, 1.0f));
      // Top-Left
      geometry.addVertex(new Vector3(-0.5f, 0.5f, 0.0f));
      geometry.addColor(new Color(1.0f, 1.0f, 1.0f, 1.0f));
    }
  }

  @Override
  public void draw(Vector2 position, Vector2 scale, Vector2 origin, float rotation, Camera camera) {
    checkInBeginEndPair();
    ColorMaterial material = getCurrentMaterial();
    setupColoredRectangle(material, position, scale, origin, rotation, camera);
    incrementBatchSize();
  }

  /**
   * Adds the specified rectangle to this batch.<br>
   * If the batch was full, it will be rendered in one draw call and it will be left empty. Then, the specified
   * rectangle will be added to this batch.
   * 
   * @param material ColorMaterial
   * @param position Posicion
   * @param scale Escala
   * @param origin Origen de la figura (debe ser un valor entre 0.0 y 1.0)
   * @param rotation Angulo de rotacion sobre el centro
   * @param camera Camara
   */
  protected void setupColoredRectangle(ColorMaterial material, Vector2 position, Vector2 scale, Vector2 origin,
      float rotation, Camera camera) {

    if ((getBatchSize() > 0) && (getBatchSize() == getBatchCapacity() || isForceDraw())) {
      drawBatch();
    }
    setSpriteVerticesColorData(material.getColor());
    updateTransform(getBatchSize(), position, scale, origin, rotation, camera);
  }

  /**
   * Sets the color of the vertices of the last rectangle added to this batch.
   * 
   * @param color Color.
   */
  protected void setSpriteVerticesColorData(Color color) {
    int i = getBatchSize() * 4;
    RectangleBatchGeometry geometry = getGeometry();
    // Bottom-Left
    geometry.getColor(i + 0).set(color);
    // Bottom-Right
    geometry.getColor(i + 1).set(color);
    // Top-Right
    geometry.getColor(i + 2).set(color);
    // Top-Left
    geometry.getColor(i + 3).set(color);
  }

  /**
   * Vertex position offset in the vertex buffer.
   * 
   * @return Offset
   */
  public int getVertexPositionOffset() {
    return vertexPositionOffset;
  }

  /**
   * Color offset in the vertex buffer.
   * 
   * @return Offset
   */
  public int getVertexColorOffset() {
    return vertexColorOffset;
  }

}

Java Source Code List

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