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@twyatt twyatt/ModelView
Created Jul 20, 2012

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Renders a mesh within a libGDX widget.
package com.traviswyatt.example.ui;
import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.graphics.GL10;
import com.badlogic.gdx.graphics.GLCommon;
import com.badlogic.gdx.graphics.PerspectiveCamera;
import com.badlogic.gdx.graphics.Pixmap.Format;
import com.badlogic.gdx.graphics.g2d.SpriteBatch;
import com.badlogic.gdx.graphics.g3d.model.Model;
import com.badlogic.gdx.graphics.glutils.FrameBuffer;
import com.badlogic.gdx.graphics.glutils.ShaderProgram;
import com.badlogic.gdx.math.Matrix4;
import com.badlogic.gdx.math.Vector2;
import com.badlogic.gdx.math.Vector3;
import com.badlogic.gdx.math.collision.BoundingBox;
import com.badlogic.gdx.scenes.scene2d.ui.ClickListener;
import com.badlogic.gdx.scenes.scene2d.ui.Widget;
public class ModelView extends Widget {
private PerspectiveCamera camera = new PerspectiveCamera(67, Gdx.graphics.getWidth(), Gdx.graphics.getHeight());
private final Model model;
private final ShaderProgram shader;
private ClickListener clickListener;
private final float prefWidth;
private final float prefHeight;
FrameBuffer frameBuffer = new FrameBuffer(Format.RGBA8888, Gdx.graphics.getWidth(), Gdx.graphics.getHeight(), true);
private static final Matrix4 modelView = new Matrix4();
public ModelView(Model model, ShaderProgram shader, float width, float height, String name) {
super(name);
this.model = model;
this.shader = shader;
BoundingBox boundingBox = new BoundingBox();
model.getBoundingBox(boundingBox);
Vector3 center = boundingBox.getCenter();
camera.position.set(boundingBox.max.x, boundingBox.max.y, boundingBox.max.z).mul(2);
camera.lookAt(center.x, center.y, center.z);
camera.up.set(0, 0, 1);
camera.normalizeUp();
camera.near = 1f;
camera.far = new Vector3(camera.position).dst2(center) * 2f;
camera.update();
prefWidth = width;
prefHeight = height;
}
@Override
public float getPrefWidth() {
return prefWidth;
}
@Override
public float getPrefHeight() {
return prefHeight;
}
@Override
public void layout() {
camera.update();
}
public void draw(SpriteBatch batch, float parentAlpha) {
validate();
batch.end();
float dt = Gdx.graphics.getDeltaTime();
modelView.rotate(0, 0, 1, 100 * dt);
// actually stage coordinates!
Vector2 tmp = Vector2.tmp.set(0, 0);
toScreenCoordinates(this, tmp);
GLCommon gl = Gdx.graphics.getGLCommon();
gl.glViewport((int)tmp.x, (int)tmp.y, (int)width, (int)height);
gl.glEnable(GL10.GL_DEPTH_TEST);
gl.glDepthMask(true);
gl.glDepthFunc(GL10.GL_LEQUAL);
gl.glDepthRangef(0f, 1f);
if (shader == null) {
// FIXME glLight and rotate
model.render();
} else {
Vector3 light = camera.position;
shader.begin();
shader.setUniformf("u_lightPosition", light.x, light.y, light.z);
shader.setUniformMatrix("u_modelView", modelView);
shader.setUniformMatrix("u_projModelView", camera.combined);
model.render(shader);
shader.end();
}
gl.glDisable(GL10.GL_DEPTH_TEST);
gl.glViewport(0, 0, Gdx.graphics.getWidth(), Gdx.graphics.getHeight());
batch.begin();
}
public boolean touchDown (float x, float y, int pointer) {
return clickListener != null;
}
public void touchUp (float x, float y, int pointer) {
if (hit(x, y) == null) return;
if (clickListener != null) clickListener.click(this, x, y);
}
public void touchDragged (float x, float y, int pointer) {
}
public void setClickListener (ClickListener clickListener) {
this.clickListener = clickListener;
}
}
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