#include "scene.h"
#include "utils.h"
#include "model.h"
#include "framebufferobject.h"
#include "fullscreenquad.h"

glm::mat4 viewMatrix, projectionMatrix;
glm::vec3 cameraPos(4.0f, 3.0f, 4.0f);
Model model;
FrameBufferObject *fbo;
FullScreenQuad *fsq;

void Init()
{
	model.Init("Res/Cube.obj");
	model.mShader->Init("Res/spot_light.vs", "Res/spot_light.fs");
	model.SetPosition(0.0f, 0.0f, 0.0f);

	//设置环境光参数
	model.SetAmbientMaterial(0.1f, 0.1f, 0.1f, 1.0f);
	model.mShader->SetVec4("U_AmbientLight", 0.1f, 0.1f, 0.1f, 1.0f);
	
	//设置环境光参数
	model.mShader->SetVec4("U_LightPos", 0.0f, 1.8f, 0.0f, 0.0f);
	model.SetDiffuseMaterial(0.4f, 0.4f, 0.4f, 1.0f);
	model.mShader->SetVec4("U_DiffuseLight", 0.8f, 0.8f, 0.8f, 1.0f);

	//设置高光参数
	model.SetSpecularMaterial(1.0f, 1.0f, 1.0f, 1.0f);
	model.mShader->SetVec4("U_SpecularLight", 1.0f, 1.0f, 1.0f, 1.0f);

	//设置聚光灯参数
	model.mShader->SetVec4("U_LightDirection", 0.0f, -1.0f, 0.0f, 15.0f);//15.0是cutoff
	model.mShader->SetVec4("U_LightOption", 32.0f, 2.0f, 0.0f, 0.0f);
	
	viewMatrix = glm::lookAt(cameraPos, glm::vec3(0.0f, 0.0f, 0.0f), glm::vec3(0.0f, 1.0f, 0.0f));
	fsq = new FullScreenQuad();
	fsq->Init();
	fsq->mShader->Init("Res/fullscreenquad.vs", "Res/fullscreenquad.fs");
}

void SetViewPortSize(float width, float height)
{
	projectionMatrix = glm::perspective(50.0f, width/height, 0.1f, 1000.0f);
	fbo = new FrameBufferObject();
	fbo->AttachColorBuffer("color", GL_COLOR_ATTACHMENT0, (int)width, (int)height);
	fbo->AttachDepthBuffer("depth", (int)width, (int)height);
	fbo->Finish();

	fbo->Bind();
	glClearColor(0.1f, 0.1f, 0.1f, 1.0f);
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
	model.Draw(viewMatrix, projectionMatrix, cameraPos.x, cameraPos.y, cameraPos.z);
	fbo->Unbind();
}

void Draw()
{
	glClearColor(0.0f,0.0f,0.0f,1.0f);
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
	fsq->mShader->SetTexture("U_Texture", fbo->GetBuffer("color"));
	fsq->Draw();
}