Android Open Source - DG-SVG_with_OpenGL Sprite

• Back to OpenGL/texture  ↑

From Project

Back to project page DG-SVG_with_OpenGL.

License

The source code is released under:

Apache License

Java Source Code

package com.dividedgames.svg;
//from   ww  w . j a v a  2s .  c  om
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.FloatBuffer;
import java.nio.ShortBuffer;

import android.content.Context;
import android.opengl.GLES20;

import com.dividedgames.svg.io.FileHelper;

/**
 * 
 * @author Jonathan Haslow-Hall
 */
public class Sprite {

  // OpenGL properties to draw the sprite 
  private FloatBuffer vertexBuffer = null;
  private FloatBuffer textureBuffer = null;
  private ShortBuffer indexBuffers;
  private int textureId = -1;
  private String texture = "";
  
  /** Create a new sprite **/
  public Sprite(float x, float y, float width, float height, String texture){
    this.texture = texture;
    
    // Some phones will only load textures that are a square of 2, 
    // So we need to convert the sent size to one of those sizes. 
    int texture_size = FileHelper.getSheetSize(Math.max(width, height));
    
    // Make our vertex buffer 
    // a float is 4 bytes, therefore we multiply the number of vertices with 4
    ByteBuffer vbb = ByteBuffer.allocateDirect(8*4);
    vbb.order(ByteOrder.nativeOrder());
    vertexBuffer = vbb.asFloatBuffer();
    vertexBuffer.put(new float[]{
      x,y,     // Top left
      x, y+height, // Bottom left
      x+width, y+height, // Bottom right
      x+width, y // Top right 
    });
    vertexBuffer.position(0);
    
    // Create Texture Buffer
    ByteBuffer byteBuf = ByteBuffer.allocateDirect(8 * 4);
    byteBuf.order(ByteOrder.nativeOrder());
    textureBuffer  = byteBuf.asFloatBuffer();
    textureBuffer.put(new float[]{
      0,0,
      0,height/texture_size,
      width/texture_size,height/texture_size,
      width/texture_size,0
    });
    textureBuffer.position(0);
    
    // Create index buffer 
    ByteBuffer ibb = ByteBuffer.allocateDirect(12);
    ibb.order(ByteOrder.nativeOrder());
    indexBuffers = ibb.asShortBuffer();
    indexBuffers.put(new short[]{
        0,1,2, // First face
        2,3,0  // Second face 
    });
    indexBuffers.position(0);
  }
  
  /** Load texture **/
  public void load(Context context){
    // Load the svg into opengl 
    textureId = FileHelper.loadTextureFromSVG(
        context.getAssets(), texture, 1.0f);
  }
  
  /** Draw the sprite to the screen **/
  public void draw(){
    /** Bind vertexes and textures uvs **/
    // Enable a handle to the triangle vertices
        GLES20.glEnableVertexAttribArray(RenderView.mPositionHandle);
        // Prepare the triangle coordinate data
        GLES20.glVertexAttribPointer(
            RenderView.mPositionHandle, 2,
                GLES20.GL_FLOAT, false,
                0, vertexBuffer);
        
        // Bind textures 
        GLES20.glEnableVertexAttribArray(RenderView.mTextCordHandle);
        GLES20.glVertexAttribPointer(
            RenderView.mTextCordHandle, 2, 
            GLES20.GL_FLOAT, false, 
            0, textureBuffer);
        
        /** Bind texture **/
        // Set the active texture unit to texture unit 0.
        GLES20.glActiveTexture(GLES20.GL_TEXTURE0);
       // Bind the texture to this unit.
       GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, this.textureId);
        // Tell the texture uniform sampler to use this texture in the shader by binding to texture unit 0.
        GLES20.glUniform1i(RenderView.mTextureHandle, 0);
        
        /** Draw **/

        // Apply the projection and view transformation
        GLES20.glUniformMatrix4fv(RenderView.mMVPMatrixHandle, 1, false, RenderView.projectionMatrix, 0);
      // Draw the square
       GLES20.glDrawElements(GLES20.GL_TRIANGLES, 6,
         GLES20.GL_UNSIGNED_SHORT, this.indexBuffers);
        
        
        /** Unload **/
        GLES20.glDisableVertexAttribArray(RenderView.mPositionHandle);
        GLES20.glDisableVertexAttribArray(RenderView.mTextCordHandle);
  }
}

Java Source Code List

• Back to OpenGL/texture  ↑