/*******************************************************************************
* Copyright 2011 See AUTHORS file.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
******************************************************************************/
package com.badlogic.gdx.tests.gles2;
import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.graphics.GL20;
import com.badlogic.gdx.graphics.Mesh;
import com.badlogic.gdx.graphics.VertexAttribute;
import com.badlogic.gdx.graphics.VertexAttributes.Usage;
import com.badlogic.gdx.graphics.glutils.ShaderProgram;
import com.badlogic.gdx.tests.utils.GdxTest;
public class HelloTriangle extends GdxTest {
ShaderProgram shader;
Mesh mesh;
@Override
public void create () {
String vertexShader = "attribute vec4 vPosition; \n" + "void main() \n"
+ "{ \n" + " gl_Position = vPosition; \n" + "} \n";
String fragmentShader = "#ifdef GL_ES\n" + "precision mediump float;\n" + "#endif\n"
+ "void main() \n" + "{ \n"
+ " gl_FragColor = vec4 ( 1.0, 1.0, 1.0, 1.0 );\n" + "}";
shader = new ShaderProgram(vertexShader, fragmentShader);
mesh = new Mesh(true, 3, 0, new VertexAttribute(Usage.Position, 3, "vPosition"));
float[] vertices = {0.0f, 0.5f, 0.0f, -0.5f, -0.5f, 0.0f, 0.5f, -0.5f, 0.0f};
mesh.setVertices(vertices);
}
@Override
public void render () {
Gdx.gl20.glViewport(0, 0, Gdx.graphics.getBackBufferWidth(), Gdx.graphics.getBackBufferHeight());
Gdx.gl20.glClear(GL20.GL_COLOR_BUFFER_BIT);
shader.begin();
mesh.render(shader, GL20.GL_TRIANGLES);
shader.end();
}
}