Sprite.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.render.particle;

import static org.lwjgl.opengl.GL11.*;

import org.lwjgl.opengl.GL20;

import cn.liutils.util.client.RenderUtils;
import cn.liutils.util.client.shader.ShaderSimple;
import cn.liutils.util.helper.Color;
import net.minecraft.client.renderer.Tessellator;
import net.minecraft.util.ResourceLocation;
import net.minecraft.world.World;

/**
 * Represents a drawable sprite in origin. Always face (0, 0, -1).
 * @author WeAthFolD
 */
public final class Sprite {
    
    /**
     * If the texture is null draw pure-colored sprite.
     */
    public ResourceLocation texture;
    public float width = 1.0f, height = 1.0f;
    public Color color = Color.WHITE();
    public boolean hasLight = false;
    public boolean cullFace = true;
    
    public Sprite() {}
    
    public Sprite(ResourceLocation rl) {
        texture = rl;
    }
    
    public Sprite setTexture(ResourceLocation rl) {
        texture = rl;
        return this;
    }
    
    public Sprite setSize(float w, float h) {
        width = w;
        height = h;
        return this;
    }
    
    public Sprite enableLight() {
        hasLight = true;
        return this;
    }
    
    public Sprite disableCullFace() {
        cullFace = false;
        return this;
    }
    
    public Sprite setColor(Color nc) {
        color = nc;
        return this;
    }
    
    public void draw() {
        glEnable(GL_BLEND);
        glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
        
        if(texture != null) {
            RenderUtils.loadTexture(texture);
        } else {
            glDisable(GL_TEXTURE_2D);
        }
        
        if(!cullFace) {
            glDisable(GL_CULL_FACE);
        }
        
        color.bind();
        Tessellator t = Tessellator.instance;
        float hw = width / 2, hh = height / 2;
        
        if(hasLight) {
            t.startDrawingQuads();
            t.setNormal(0, 0, -1);
            t.addVertexWithUV(-hw, hh, 0, 0, 0);
            t.addVertexWithUV(-hw, -hh, 0, 0, 1);
            t.addVertexWithUV(hw, -hh, 0, 1, 1);
            t.addVertexWithUV(hw, hh, 0, 1, 0);
            t.draw();
        } else {
            // Use legacy routine to avoid ShaderMod to ruin the render
            ShaderSimple.instance().useProgram();
            glBegin(GL_QUADS);
            glTexCoord2f(0, 0); glVertex3f(-hw, hh, 0);
            glTexCoord2f(0, 1); glVertex3f(-hw, -hh, 0);
            glTexCoord2f(1, 1); glVertex3f(hw, -hh, 0);
            glTexCoord2f(1, 0); glVertex3f(hw, hh, 0);
            glEnd();
            GL20.glUseProgram(0);
        }
        
        glEnable(GL_CULL_FACE);
        glEnable(GL_TEXTURE_2D);
    }
    
}