package eu.tankernn.gameEngine.environmentMap;

import org.lwjgl.opengl.Display;
import org.lwjgl.opengl.GL11;
import org.lwjgl.opengl.GL13;
import org.lwjgl.opengl.GL14;
import org.lwjgl.opengl.GL30;
import org.lwjgl.util.vector.Vector3f;

import eu.tankernn.gameEngine.loader.textures.Texture;
import eu.tankernn.gameEngine.renderEngine.MasterRenderer;
import eu.tankernn.gameEngine.renderEngine.Scene;

public class EnvironmentMapRenderer {
	public static void renderEnvironmentMap(Texture cubeMap, Scene scene, Vector3f center, MasterRenderer renderer) {
		CubeMapCamera camera = new CubeMapCamera(center);
		
		int fbo = GL30.glGenFramebuffers();
		GL30.glBindFramebuffer(GL30.GL_FRAMEBUFFER, fbo);
		GL11.glDrawBuffer(GL30.GL_COLOR_ATTACHMENT0);
		
		int depthBuffer = GL30.glGenRenderbuffers();
		GL30.glBindRenderbuffer(GL30.GL_RENDERBUFFER, depthBuffer);
		GL30.glRenderbufferStorage(GL30.GL_RENDERBUFFER, GL14.GL_DEPTH_COMPONENT24, cubeMap.getWidth(), cubeMap.getHeight());
		GL30.glFramebufferRenderbuffer(GL30.GL_FRAMEBUFFER, GL30.GL_DEPTH_ATTACHMENT, GL30.GL_RENDERBUFFER, depthBuffer);
		GL11.glViewport(0, 0, cubeMap.getWidth(), cubeMap.getHeight());
		
		for (int i = 0; i < 6; i++) {
			GL30.glFramebufferTexture2D(GL30.GL_FRAMEBUFFER, GL30.GL_COLOR_ATTACHMENT0, GL13.GL_TEXTURE_CUBE_MAP_POSITIVE_X + i, cubeMap.textureId, 0);
			
			camera.switchToFace(i);
			
			renderer.renderLowQualityScene(scene, camera);
		}
		
		GL30.glBindFramebuffer(GL30.GL_FRAMEBUFFER, 0);
		GL11.glViewport(0, 0, Display.getWidth(), Display.getHeight());
	}
}