LIBGDX版NEHE OPENGL- 8. Blend & 加載模型和帖圖

初學OpenGL讓我最麻煩的一件事情就是，一個正方體，要輸入下面這麼多頂點。

squareMesh.setVertices(new float[] {
				// Front face:
				0.5f, 1.0f, -6.0f, Color.toFloatBits(0f, 0f, 1f, 1f), // TL
				0.5f, -1.0f, -6.0f, Color.toFloatBits(0f, 0f, 1f, 1f), // BL
				2.5f, -1.0f, -6.0f, Color.toFloatBits(0f, 0f, 1f, 1f), // BR
				2.5f, 1.0f, -6.0f, Color.toFloatBits(0f, 0f, 1f, 1f), // TR
				// Top face:
				0.5f, 1.0f, -8.0f, Color.toFloatBits(1f, 0f, 1f, 1f), // LR
				0.5f, 1.0f, -6.0f, Color.toFloatBits(1f, 0f, 1f, 1f), // LN
				2.5f, 1.0f, -6.0f, Color.toFloatBits(1f, 0f, 1f, 1f), // RN
				2.5f, 1.0f, -8.0f, Color.toFloatBits(1f, 0f, 1f, 1f), // RR
				// Rear face
				2.5f, 1.0f, -8.0f, Color.toFloatBits(0f, 1f, 0f, 1f), // TR
				2.5f, -1.0f, -8.0f, Color.toFloatBits(0f, 1f, 0f, 1f), // BR
				0.5f, -1.0f, -8.0f, Color.toFloatBits(0f, 1f, 0f, 1f), // BL
				0.5f, 1.0f, -8.0f, Color.toFloatBits(0f, 1f, 0f, 1f), // TL
				// Bottom face
				0.5f, -1.0f, -6.0f, Color.toFloatBits(0.5f, 0.5f, 0.5f, 1f), // LN
				2.5f, -1.0f, -6.0f, Color.toFloatBits(0.5f, 0.5f, 0.5f, 1f), // RN
				2.5f, -1.0f, -8.0f, Color.toFloatBits(0.5f, 0.5f, 0.5f, 1f), // RR
				0.5f, -1.0f, -8.0f, Color.toFloatBits(0.5f, 0.5f, 0.5f, 1f), // LR
				// Left face
				0.5f, 1.0f, -8.0f, Color.toFloatBits(1f, 1f, 0f, 1f), // TR
				0.5f, 1.0f, -6.0f, Color.toFloatBits(1f, 1f, 0f, 1f), // TN
				0.5f, -1.0f, -6.0f, Color.toFloatBits(1f, 1f, 0f, 1f), // BN
				0.5f, -1.0f, -8.0f, Color.toFloatBits(1f, 1f, 0f, 1f), // BR
				// Right face
				2.5f, 1.0f, -6.0f, Color.toFloatBits(0f, 1f, 1f, 1f), // TN
				2.5f, 1.0f, -8.0f, Color.toFloatBits(0f, 1f, 1f, 1f), // TR
				2.5f, -1.0f, -8.0f, Color.toFloatBits(0f, 1f, 1f, 1f), // BR
				2.5f, -1.0f, -6.0f, Color.toFloatBits(0f, 1f, 1f, 1f), // BN
		});           

今天就來說說友善的辦法，連同Blend的方法一并發出來：

package com.kyugao.screen;

import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.Input;
import com.badlogic.gdx.InputProcessor;
import com.badlogic.gdx.Screen;
import com.badlogic.gdx.files.FileHandle;
import com.badlogic.gdx.graphics.GL10;
import com.badlogic.gdx.graphics.PerspectiveCamera;
import com.badlogic.gdx.graphics.Texture;
import com.badlogic.gdx.graphics.g3d.loaders.ModelLoaderRegistry;
import com.badlogic.gdx.graphics.g3d.model.still.StillModel;

public class Blend implements Screen, InputProcessor {

	private PerspectiveCamera camera;
	private Texture texture;
	private float rquad = 0;

	// indicator of light and blend
	private boolean blend;

	private StillModel model;

	@Override
	public void render(float delta) {

		camera.update();
		camera.apply(Gdx.graphics.getGL10());
		Gdx.gl.glClear(GL10.GL_COLOR_BUFFER_BIT | GL10.GL_DEPTH_BUFFER_BIT);
		Gdx.gl.glEnable(GL10.GL_DEPTH_TEST);
		Gdx.gl.glEnable(GL10.GL_TEXTURE_2D);

		Gdx.gl.glBlendFunc(GL10.GL_SRC_ALPHA, GL10.GL_ONE);

		drawGLScene();
		rquad += 20f * delta; // 每秒鐘轉20度，計算在每一次render的時間差裡，要轉的角度。比如0.5秒，那就應該轉10度。
		rquad %= 360;
	}

	private boolean drawGLScene() {

		Gdx.gl10.glLoadIdentity();
		Gdx.gl10.glTranslatef(0.0f, 0.0f, -7.0f);
		Gdx.gl10.glRotatef(rquad, 1.0f, 1.0f, 1.0f);
		texture.bind();
		model.render();
		return true;
	}

	@Override
	public void show() {
		FileHandle modelFile = Gdx.files.internal("g3d/cube.obj");
		model = ModelLoaderRegistry.loadStillModel(modelFile);
		texture = new Texture(Gdx.files.internal("data/textureglass.png"));
		Gdx.input.setInputProcessor(this);
	}

	@Override
	public void hide() {
	}

	@Override
	public void pause() {
	}

	@Override
	public void resume() {
	}

	@Override
	public void dispose() {
	}

	@Override
	public void resize(int width, int height) {
		float aspectRatio = (float) width / (float) height;
		camera = new PerspectiveCamera(45, 2f * aspectRatio, 2f);
	}

	@Override
	public boolean keyDown(int keycode) {
		if (keycode == Input.Keys.B) {
			System.out.println("B down");
			blend = !blend;
			if (blend) {
				Gdx.gl.glEnable(GL10.GL_BLEND);
				Gdx.gl.glDisable(GL10.GL_DEPTH_TEST);
			} else {
				Gdx.gl.glEnable(GL10.GL_DEPTH_TEST);
				Gdx.gl.glDisable(GL10.GL_BLEND);
			}
		}
		return false;
	}

	@Override
	public boolean keyUp(int keycode) {
		return false;
	}

	@Override
	public boolean keyTyped(char character) {
		return false;
	}

	@Override
	public boolean touchDown(int screenX, int screenY, int pointer, int button) {
		return false;
	}

	@Override
	public boolean touchUp(int screenX, int screenY, int pointer, int button) {
		return false;
	}

	@Override
	public boolean touchDragged(int screenX, int screenY, int pointer) {
		return false;
	}

	@Override
	public boolean mouseMoved(int screenX, int screenY) {
		return false;
	}

	@Override
	public boolean scrolled(int amount) {
		return false;
	}

}
           

效果如下：