Examples of com.badlogic.gdx.graphics.VertexAttribute

com.badlogic.gdx.graphics.VertexAttribute
A single vertex attribute defined by its {@link Usage}, its number of components and its shader alias. The Usage is needed for the fixed function pipeline of OpenGL ES 1.x. Generic attributes are not supported in the fixed function pipeline. The number of components defines how many components the attribute has. The alias defines to which shader attribute this attribute should bind. The alias is used by a {@link Mesh} when drawing with a {@link ShaderProgram}. The alias can be changed at any time. @author mzechner

      start[i] = new Vector2();
      end[i] = new Vector2();
    }
    setDirection(direction);


    lightMesh = new Mesh(VertexDataType.VertexArray, staticLight, vertexNum, 0, new VertexAttribute(Usage.Position, 2,
      "vertex_positions"), new VertexAttribute(Usage.ColorPacked, 4, "quad_colors"),
      new VertexAttribute(Usage.Generic, 1, "s"));
    softShadowMesh = new Mesh(VertexDataType.VertexArray, staticLight, vertexNum, 0, new VertexAttribute(Usage.Position, 2,
      "vertex_positions"), new VertexAttribute(Usage.ColorPacked, 4, "quad_colors"),
      new VertexAttribute(Usage.Generic, 1, "s"));
    update();
  }

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    verts[i++] = 1f; // y4


    verts[i++] = 0f; // u4
    verts[i++] = 1f; // v4


    Mesh tmpMesh = new Mesh(true, 4, 0, new VertexAttribute(
        Usage.Position, 2, "a_position"), new VertexAttribute(
        Usage.TextureCoordinates, 2, "a_texCoord0"));


    tmpMesh.setVertices(verts);
    return tmpMesh;

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    verts[i++] = 1f; // y4


    verts[i++] = 0f; // u4
    verts[i++] = 1f; // v4


    Mesh tmpMesh = new Mesh(true, 4, 0, new VertexAttribute(
        Usage.Position, 2, "a_position"), new VertexAttribute(
        Usage.TextureCoordinates, 2, "a_texCoord0"));


    tmpMesh.setVertices(verts);
    return tmpMesh;

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   * @param defaultShader the default shader to use. This is not owned by the SpriteBatch and must be disposed separately. */
  public SpriteBatch (int size, int buffers, ShaderProgram defaultShader) {
    this.buffers = new Mesh[buffers];


    for (int i = 0; i < buffers; i++) {
      this.buffers[i] = new Mesh(VertexDataType.VertexArray, false, size * 4, size * 6, new VertexAttribute(Usage.Position, 2,
        ShaderProgram.POSITION_ATTRIBUTE), new VertexAttribute(Usage.ColorPacked, 4, ShaderProgram.COLOR_ATTRIBUTE),
        new VertexAttribute(Usage.TextureCoordinates, 2, ShaderProgram.TEXCOORD_ATTRIBUTE + "0"));
    }


    projectionMatrix.setToOrtho2D(0, 0, Gdx.graphics.getWidth(), Gdx.graphics.getHeight());


    vertices = new float[size * Sprite.SPRITE_SIZE];

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      // write vertex attributes
      writer.newChunk(G3dConstants.VERTEX_ATTRIBUTES);
      writer.writeInt(mesh.mesh.getVertexAttributes().size());
      for (int i = 0; i < mesh.mesh.getVertexAttributes().size(); i++) {
        VertexAttribute attribute = mesh.mesh.getVertexAttributes().get(i);
        writer.newChunk(G3dConstants.VERTEX_ATTRIBUTE);
        writer.writeInt(attribute.usage);
        writer.writeInt(attribute.numComponents);
        writer.writeString(attribute.alias);
        writer.endChunk();

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  }


  private static VertexAttribute[] createVertexAttributes (boolean hasNormals, int uvs) {
    VertexAttribute[] attributes = new VertexAttribute[1 + (hasNormals ? 1 : 0) + uvs];
    int idx = 0;
    attributes[idx++] = new VertexAttribute(Usage.Position, 3, ShaderProgram.POSITION_ATTRIBUTE);
    if (hasNormals) attributes[idx++] = new VertexAttribute(Usage.Normal, 3, ShaderProgram.NORMAL_ATTRIBUTE);
    for (int i = 0; i < uvs; i++) {
      attributes[idx++] = new VertexAttribute(Usage.TextureCoordinates, 2, ShaderProgram.TEXCOORD_ATTRIBUTE + i);
    }
    return attributes;
  }

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