Java ShaderProgram.POSITION_ATTRIBUTE属性代码示例

/**
 * Instantiates a new ShaderEffect. The ShaderEffect will NOT own shader
 * program, so it will not dispose it either!
 * 
 * @param program
 *            the ShaderProgram to use for this effect
 */
public ShaderEffect(ShaderProgram program) {
	this.program = program;

	if (meshRefCount++ <= 0) {
		mesh = new Mesh(VertexDataType.VertexArray, true, 4, 0,
				new VertexAttribute(Usage.Position, 2, ShaderProgram.POSITION_ATTRIBUTE),
				new VertexAttribute(Usage.TextureCoordinates, 2, ShaderProgram.TEXCOORD_ATTRIBUTE + "0"));

		// @formatter:off
		float[] verts = {
				// vertex    texture
				  -1, -1,    0f, 0f,
				   1, -1,    1f, 0f,
				   1,  1,    1f, 1f,
				  -1,  1,    0f, 1f,
		};
		// @formatter:on

		mesh.setVertices(verts);
	}
}
 

private static ShaderProgram createShaderProgram() {
	String vertex = "attribute vec4 " + ShaderProgram.POSITION_ATTRIBUTE + ";\n";
	vertex += "uniform mat4 u_projModelView;\n";
	vertex += "void main() {\n" + "   gl_Position = u_projModelView * " + ShaderProgram.POSITION_ATTRIBUTE + ";\n";
	vertex += "   gl_PointSize = 1.0;\n";
	vertex += "}\n";
	String fragment = "#ifdef GL_ES\n" + "precision mediump float;\n" + "#endif\n";
	fragment += "void main() {\n" + "   gl_FragColor = vec4(0, 1, 0, 1)"; // #00ff00ff
	fragment += ";\n}";
	return new ShaderProgram(vertex, fragment);
}
 

private static ShaderProgram createShaderProgram() {
  String vertex = "attribute vec4 " + ShaderProgram.POSITION_ATTRIBUTE + ";\n";
  vertex += "uniform mat4 u_projModelView;\n";
  vertex += "void main() {\n" + "   gl_Position = u_projModelView * " + ShaderProgram.POSITION_ATTRIBUTE + ";\n";
  vertex += "   gl_PointSize = 1.0;\n";
  vertex += "}\n";
  String fragment = "#ifdef GL_ES\n" + "precision mediump float;\n" + "#endif\n";
  fragment += "void main() {\n" + "   gl_FragColor = vec4(0, 1, 0, 1)"; //#00ff00ff
  fragment += ";\n}";
  return new ShaderProgram(vertex, fragment);
}
 

/** Constructs a new SpriteBatch. Sets the projection matrix to an orthographic projection with y-axis point upwards, x-axis
 * point to the right and the origin being in the bottom left corner of the screen. The projection will be pixel perfect with
 * respect to the current screen resolution.
 * <p>
 * The defaultShader specifies the shader to use. Note that the names for uniforms for this default shader are different than
 * the ones expect for shaders set with {@link #setShader(ShaderProgram)}. See {@link #createDefaultShader()}.
 * @param size The max number of sprites in a single batch. Max of 5460.
 * @param defaultShader The default shader to use. This is not owned by the SpriteBatch and must be disposed separately. */
public FontBatch (int size, ShaderProgram defaultShader) {
	this.vertexsize = size;
	size = 1000;
	// 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);

	Mesh.VertexDataType vertexDataType = Mesh.VertexDataType.VertexArray;
	if (Gdx.gl30 != null) {
		vertexDataType = Mesh.VertexDataType.VertexBufferObjectWithVAO;
	}
	mesh = new Mesh(vertexDataType, false, size * 4, size * 6, new VertexAttribute(Usage.Position, vertexsize-3,
		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 * 4*vertexsize];

	int len = size * 6;
	short[] indices = new short[len];
	short j = 0;
	for (int i = 0; i < len; i += 6, j += 4) {
		indices[i] = j;
		indices[i + 1] = (short)(j + 1);
		indices[i + 2] = (short)(j + 2);
		indices[i + 3] = (short)(j + 2);
		indices[i + 4] = (short)(j + 3);
		indices[i + 5] = j;
	}
	mesh.setIndices(indices);

	if (defaultShader == null) {
		shader = createDefaultShader();
		ownsShader = true;
	} else
		shader = defaultShader;
}
 

/** Returns a new instance of the default shader used by SpriteBatch for GL2 when no shader is specified. */
static public ShaderProgram createDefaultShader () {
	String vertexShader = "attribute vec4 " + ShaderProgram.POSITION_ATTRIBUTE + ";\n" //
		+ "attribute vec4 " + ShaderProgram.COLOR_ATTRIBUTE + ";\n" //
		+ "attribute vec2 " + ShaderProgram.TEXCOORD_ATTRIBUTE + "0;\n" //
		+ "uniform mat4 u_projTrans;\n" //
		+ "varying vec4 v_color;\n" //
		+ "varying vec2 v_texCoords;\n" //
		+ "\n" //
		+ "void main()\n" //
		+ "{\n" //
		+ "   v_color = " + ShaderProgram.COLOR_ATTRIBUTE + ";\n" //
		+ "   v_color.a = v_color.a * (255.0/254.0);\n" //
		+ "   v_texCoords = " + ShaderProgram.TEXCOORD_ATTRIBUTE + "0;\n" //
		+ "   gl_Position =  u_projTrans * " + ShaderProgram.POSITION_ATTRIBUTE + ";\n" //
		+ "}\n";
	String fragmentShader = "#ifdef GL_ES\n" //
		+ "#define LOWP lowp\n" //
		+ "precision mediump float;\n" //
		+ "#else\n" //
		+ "#define LOWP \n" //
		+ "#endif\n" //
		+ "varying LOWP vec4 v_color;\n" //
		+ "varying vec2 v_texCoords;\n" //
		+ "uniform sampler2D u_texture;\n" //
		+ "void main()\n"//
		+ "{\n" //
		+ "  gl_FragColor = v_color * texture2D(u_texture, v_texCoords);\n" //
		+ "}";

	ShaderProgram shader = new ShaderProgram(vertexShader, fragmentShader);
	if (shader.isCompiled() == false) throw new IllegalArgumentException("Error compiling shader: " + shader.getLog());
	return shader;
}
 

public static VertexAttribute Position () {
	return new VertexAttribute(Usage.Position, 3, ShaderProgram.POSITION_ATTRIBUTE);
}