#include "scene.h"
#include "ggl.h"
#include "utils.h"
#include "ground.h"
#include "shader.h"
#include "model.h"
#include "skybox.h"
#include "particleSystem.h"
#include "framebufferobject.h"

glm::mat4 modelMatrix, viewMatrix, projectionMatrix;
glm::vec3 cameraPos(10.0f, 10.0f, 10.0f);
Ground ground;
Model model, niutou, sphere;
SkyBox skybox;
ParticleSystem ps; 
FrameBufferObject *fbo;
VertexBuffer *fsqVertex;
Shader *fsqShader;
glm::mat4 fsqViewMatrix;

void Init() {
	viewMatrix = glm::lookAt(cameraPos, glm::vec3(0.0f, 0.0f, 0.0f), glm::vec3(0.0f,1.0f,0.0f));

	ground.Init();

	model.Init("Res/Sphere.obj");
	model.SetTexture("Res/earth.bmp");
	model.SetPosition(0.0f, 0.0f, 0.0f);
	skybox.Init("Res/");
	niutou.Init("Res/niutou.obj");
	niutou.SetTexture("Res/niutou.bmp");
	niutou.mModelMatrix = glm::translate(-5.0f, 0.0f, 4.0f)*glm::scale(0.05f, 0.05f, 0.05f);
	ps.Init(0.0f, 0.0f, 0.0f);
}
void SetViewPortSize(float width, float height) {
	projectionMatrix = glm::perspective(60.0f, width / height, 0.1f, 1000.0f);

	fbo = new FrameBufferObject;
	fbo->AttachColorBuffer("color", GL_COLOR_ATTACHMENT0, (int)width, (int)height);
	fbo->AttachColorBuffer("color1", GL_COLOR_ATTACHMENT1, (int)width, (int)height);
	fbo->AttachDepthBuffer("depth", (int)width, (int)height);
	fbo->Finish();

	sphere.Init("Res/Sphere.obj");
	sphere.SetTexture(fbo->GetBuffer("color"));
	sphere.mModelMatrix = glm::scale(4.0f, 4.0f, 4.0f)*glm::rotate(150.0f, 0.0f, 1.0f, 0.0f);

	float aspect = width / height;
	float halfFOV = 60.0f / 2.0f;
	float randianHalfFOV = 3.14f*halfFOV / 180.0f;
	float tanHalfFOV = sinf(randianHalfFOV) / cosf(randianHalfFOV);
	float y = tanHalfFOV*0.2f;
	float x = y*aspect;
	fsqVertex = new VertexBuffer;
	fsqVertex->SetSize(4);
	fsqVertex->SetPosition(0, -x, -y, -0.2f);
	fsqVertex->SetTexcoord(0, 0.0f, 0.0f);
	fsqVertex->SetPosition(1, x, -y, -0.2f);
	fsqVertex->SetTexcoord(1, 1.0f, 0.0f);
	fsqVertex->SetPosition(2, -x, y, -0.2f);
	fsqVertex->SetTexcoord(2, 0.0f, 1.0f);
	fsqVertex->SetPosition(3, x, y, -0.2f);
	fsqVertex->SetTexcoord(3, 1.0f, 1.0f);

	fsqShader = new Shader;
	fsqShader->Init("Res/texture.vs", "Res/texture.fs");
	fsqShader->SetTexture("U_Texture", fbo->GetBuffer("color"));
}
void Draw() {
	float frameTime = GetFrameTime();
	glClearColor(0.1f, 0.4f, 0.6f, 1.0f);
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

	fbo->Bind();
	skybox.Draw(viewMatrix, projectionMatrix, cameraPos.x, cameraPos.y, cameraPos.z);
	ground.Draw(viewMatrix, projectionMatrix);
	model.Draw(viewMatrix, projectionMatrix, cameraPos.x, cameraPos.y, cameraPos.z);
	niutou.Draw(viewMatrix, projectionMatrix, cameraPos.x, cameraPos.y, cameraPos.z);
	ps.Update(frameTime);
	ps.Draw(viewMatrix, projectionMatrix);
	fbo->Unbind();

	//sphere.Draw(viewMatrix, projectionMatrix, cameraPos.x, cameraPos.y, cameraPos.z);

	fsqVertex->Bind();
	fsqShader->Bind(glm::value_ptr(modelMatrix), glm::value_ptr(fsqViewMatrix), glm::value_ptr(projectionMatrix));
	glDrawArrays(GL_TRIANGLE_STRIP, 0, fsqVertex->mVertexCount);
	fsqVertex->Unbind();
}