GLSLMesh.java

/**
 * Copyright (c) Lambda Innovation, 2013-2015
 * 本作品版权由Lambda Innovation所有。
 * http://www.li-dev.cn/
 *
 * This project is open-source, and it is distributed under
 * the terms of GNU General Public License. You can modify
 * and distribute freely as long as you follow the license.
 * 本项目是一个开源项目，且遵循GNU通用公共授权协议。
 * 在遵照该协议的情况下，您可以自由传播和修改。
 * http://www.gnu.org/licenses/gpl.html
 */
package cn.liutils.util.client.shader;

import static org.lwjgl.opengl.GL11.GL_TRIANGLES;
import static org.lwjgl.opengl.GL11.glBegin;
import static org.lwjgl.opengl.GL11.glEnd;
import static org.lwjgl.opengl.GL11.glNormal3d;
import static org.lwjgl.opengl.GL11.glTexCoord2d;
import static org.lwjgl.opengl.GL11.glVertex3d;
import static org.lwjgl.opengl.GL20.glUseProgram;

import org.apache.commons.lang3.NotImplementedException;
import org.lwjgl.opengl.GL11;
import org.lwjgl.opengl.GL20;

import cn.liutils.render.material.Material;
import cn.liutils.render.mesh.Mesh;
import cn.liutils.render.mesh.RenderStage;

/**
 * External mesh drawer using shader.
 * @author WeAthFolD
 */
public class GLSLMesh extends Mesh {
    
    public GLSLMesh() {}
    
    public void draw(ShaderProgram program) {
        draw(program.getProgramID());
    }
    
    /**
     * Draw the mesh using the specified shader program.
     */
    public void draw(int programID) {
        glUseProgram(programID);
        glBegin(GL_TRIANGLES);
        for(int j = 0; j < triangles.length; ++j) {
            int i = triangles[j];
            if(uvs != null) {
                glTexCoord2d(uvs[i][0], uvs[i][1]);
            } else {
                glTexCoord2d(0, 0);
            }
            if(normals != null) {
                glNormal3d(normals[i][0], normals[i][1], normals[i][2]);
            } else {
                glNormal3d(0, 0, 0);
            }
            glVertex3d(vertices[i][0], vertices[i][1], vertices[i][2]);
        }
        glEnd();
        glUseProgram(0);
    }
    
    @Override
    public void draw(Material mat) {
        //System.out.println("Current program: " + GL11.glGetInteger(GL20.GL_CURRENT_PROGRAM));
        mat.onRenderStage(RenderStage.START);
        mat.onRenderStage(RenderStage.TRANSFORM);
        mat.onRenderStage(RenderStage.BEFORE_TESSELLATE);
        draw(GL11.glGetInteger(GL20.GL_CURRENT_PROGRAM));
        mat.onRenderStage(RenderStage.END);
    }
    
    @Override
    public void redraw(Material mat) {
        throw new NotImplementedException("GLSLMesh doesn't handle tess drawing routine");
    }
    
}