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

   * </p>
   * 
   * @param size the batch size in number of sprites */
  public SpriteBatch (int size) {
    this.buffers = new Mesh[1];
    this.buffers[0] = 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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   * @param buffers the number of buffers to use. only makes sense with VBOs. This is an expert function. */
  public SpriteBatch (int size, int buffers) {
    this.buffers = new Mesh[buffers];


    for (int i = 0; i < buffers; i++) {
      this.buffers[i] = new Mesh(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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    verts[V3] = 1f;


    verts[U4] = 0f;
    verts[V4] = 1f;


    Mesh tmpMesh = new Mesh(VertexDataType.VertexArray, 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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    }
    dropRadius = 0.1f + dropRadiusK;
    dropRadiusPixel = (int) (dropRadius * PARTICLE_SIZE);
    dropRadiusPixel2 = dropRadiusPixel * dropRadiusPixel;
    if (IS_DESKTOP) {
      lineMesh = new Mesh(false, (SIZE) * 2, 0, new VertexAttribute(Usage.Position, 2, "a_pos"), new VertexAttribute(Usage.ColorPacked, 4, "a_color"));
      lineVertices = new float[(SIZE) * 2 * 2 * 3];
      disposableParticles = new ArrayList<Particle>(SIZE);
    } else {
      lineMesh = new Mesh(false, (ANDROID_SIZE) * 2, 0, new VertexAttribute(Usage.Position, 2, "a_pos"), new VertexAttribute(Usage.ColorPacked, 4, "a_color"));
      lineVertices = new float[(ANDROID_SIZE) * 2 * 2 * 3];
    }


    // On Android populate directly
    if (!IS_DESKTOP) {

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          prefix += "#define environmentCubemapFlag\n";
      }
    }
    final int n = renderable.mesh.getVertexAttributes().size();
    for (int i = 0; i < n; i++) {
      final VertexAttribute attr = renderable.mesh.getVertexAttributes().get(i);
      if (attr.usage == Usage.BoneWeight)
        prefix += "#define boneWeight"+attr.unit+"Flag\n";
      else if (attr.usage == Usage.TextureCoordinates)
        prefix += "#define texCoord"+attr.unit+"Flag\n";
    }

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  /** @param usage bitwise mask of the {@link com.badlogic.gdx.graphics.VertexAttributes.Usage}, 
   * only Position, Color, Normal and TextureCoordinates is supported. */
  public static VertexAttributes createAttributes(long usage) {
    final Array<VertexAttribute> attrs = new Array<VertexAttribute>();
    if ((usage & Usage.Position) == Usage.Position)
      attrs.add(new VertexAttribute(Usage.Position, 3, ShaderProgram.POSITION_ATTRIBUTE));
    if ((usage & Usage.Color) == Usage.Color)
      attrs.add(new VertexAttribute(Usage.Color, 4, ShaderProgram.COLOR_ATTRIBUTE));
    if ((usage & Usage.Normal) == Usage.Normal)
      attrs.add(new VertexAttribute(Usage.Normal, 3, ShaderProgram.NORMAL_ATTRIBUTE));
    if ((usage & Usage.TextureCoordinates) == Usage.TextureCoordinates)
      attrs.add(new VertexAttribute(Usage.TextureCoordinates, 2, ShaderProgram.TEXCOORD_ATTRIBUTE+"0"));
    final VertexAttribute attributes[] = new VertexAttribute[attrs.size];
    for (int i = 0; i < attributes.length; i++)
      attributes[i] = attrs.get(i);
    return new VertexAttributes(attributes);
  }

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    this.vindex = 0;
    this.istart = 0;
    this.part = null;
    this.stride = attributes.vertexSize / 4;
    this.vertex = new float[stride];
    VertexAttribute a = attributes.findByUsage(Usage.Position);
    if (a == null)
      throw new GdxRuntimeException("Cannot build mesh without position attribute");
    posOffset = a.offset / 4;
    posSize = a.numComponents;
    a = attributes.findByUsage(Usage.Normal);

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    // 32767 is max index, so 32767 / 6 - (32767 / 6 % 3) = 5460.
    if (size > 5460) throw new IllegalArgumentException("Can't have more than 5460 sprites per batch: " + size);


    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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    final long mask = renderable.material.getMask();
    final long attributes = renderable.mesh.getVertexAttributes().getMask();
    if ((attributes & Usage.BoneWeight) == Usage.BoneWeight) {
      final int n = renderable.mesh.getVertexAttributes().size();
      for (int i = 0; i < n; i++) {
        final VertexAttribute attr = renderable.mesh.getVertexAttributes().get(i);
        if (attr.usage == Usage.BoneWeight)
          prefix += "#define boneWeight"+attr.unit+"Flag\n";
      }
    }
    // FIXME Add transparent texture support

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    super(renderable, config, shaderProgram);
    this.numBones = renderable.bones == null ? 0 : config.numBones;
    int w = 0;
    final int n = renderable.mesh.getVertexAttributes().size();
    for (int i = 0; i < n; i++) {
      final VertexAttribute attr = renderable.mesh.getVertexAttributes().get(i);
      if (attr.usage == Usage.BoneWeight)
        w |= (1 << attr.unit);
    }
    weights = w;
  }

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