#include <windows.h>
#include "glew.h"
#include <stdio.h>
#include <math.h>
#include "utils.h"
#include "GPUProgram.h"
#include "ObjModel.h"
#include "FBO.h"
#include "FullScreenQuad.h"
#include "Glm/glm.hpp"
#include "Glm/ext.hpp"
#pragma comment(lib,"opengl32.lib")
#pragma comment(lib,"glew32.lib")

LRESULT CALLBACK GLWindowProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
	switch (msg)
	{
	case WM_CLOSE:
		PostQuitMessage(0);
		break;
	}
	return DefWindowProc(hwnd, msg, wParam, lParam);
}


INT WINAPI WinMain(_In_ HINSTANCE hInstance, _In_opt_ HINSTANCE hPrevInstance, _In_ LPSTR lpCmdLine, _In_ int nShowCmd)
{
	WNDCLASSEX wndClass;
	wndClass.cbClsExtra = 0;
	wndClass.cbSize = sizeof(WNDCLASSEX);
	wndClass.cbWndExtra = 0;
	wndClass.hbrBackground = NULL;
	wndClass.hCursor = LoadCursor(NULL, IDC_ARROW);
	wndClass.hIcon = NULL;
	wndClass.hIconSm = NULL;
	wndClass.hInstance = hInstance;
	wndClass.lpfnWndProc = GLWindowProc;
	wndClass.lpszClassName = "OpenGL";
	wndClass.lpszMenuName = NULL;
	wndClass.style = CS_VREDRAW | CS_HREDRAW;
	ATOM atom = RegisterClassEx(&wndClass);

	RECT rect;
	rect.left = 0;
	rect.top = 0;
	rect.right = 1280;
	rect.bottom = 720;
	AdjustWindowRect(&rect, WS_OVERLAPPEDWINDOW, FALSE);

	HWND hwnd = CreateWindowEx(NULL, "OpenGL", "RenderWindow", WS_OVERLAPPEDWINDOW, 100, 100, rect.right - rect.left, rect.bottom - rect.top, NULL, NULL, hInstance, NULL);
	HDC dc = GetDC(hwnd);
	PIXELFORMATDESCRIPTOR pfd;
	memset(&pfd, 0, sizeof(PIXELFORMATDESCRIPTOR));
	pfd.nVersion = 1;
	pfd.dwFlags = PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL | PFD_TYPE_RGBA | PFD_DOUBLEBUFFER;
	pfd.iLayerType = PFD_MAIN_PLANE;
	pfd.iPixelType = PFD_TYPE_RGBA;
	pfd.cColorBits = 32;
	pfd.cDepthBits = 24;
	pfd.cStencilBits = 8;

	int pixelFormatID = ChoosePixelFormat(dc, &pfd);

	SetPixelFormat(dc, pixelFormatID, &pfd);

	HGLRC rc = wglCreateContext(dc);
	wglMakeCurrent(dc, rc);

	GetClientRect(hwnd, &rect);
	int viewportWidth = rect.right - rect.left, viewportHeight = rect.bottom - rect.top;

	glewInit();

	//init fsqgpu program
	GPUProgram originalProgram;
	originalProgram.AttachShader(GL_VERTEX_SHADER, "res/shader/fullscreenquad.vs");
	originalProgram.AttachShader(GL_FRAGMENT_SHADER, "res/shader/fullscreenquad.fs");
	originalProgram.Link();
	originalProgram.DetectAttribute("pos");
	originalProgram.DetectAttribute("texcoord");
	originalProgram.DetectUniform("U_MainTexture");

	//init projector program
	GPUProgram sampleProgram;
	sampleProgram.AttachShader(GL_VERTEX_SHADER, "res/shader/sample.vs");
	sampleProgram.AttachShader(GL_FRAGMENT_SHADER, "res/shader/sample.fs");
	sampleProgram.Link();

	sampleProgram.DetectAttribute("pos");
	sampleProgram.DetectAttribute("texcoord");
	sampleProgram.DetectUniform("M");
	sampleProgram.DetectUniform("V");
	sampleProgram.DetectUniform("P");
	sampleProgram.DetectUniform("U_MainTexture");


	//init projective texture program
	GPUProgram projectedTextureProgram;
	projectedTextureProgram.AttachShader(GL_VERTEX_SHADER, "res/shader/projector.vs");
	projectedTextureProgram.AttachShader(GL_FRAGMENT_SHADER, "res/shader/projector.fs");
	projectedTextureProgram.Link();

	projectedTextureProgram.DetectAttribute("pos");
	projectedTextureProgram.DetectAttribute("texcoord");
	projectedTextureProgram.DetectUniform("M");
	projectedTextureProgram.DetectUniform("V");
	projectedTextureProgram.DetectUniform("P");
	projectedTextureProgram.DetectUniform("U_ShadowMap");
	projectedTextureProgram.DetectUniform("U_MainTexture");
	projectedTextureProgram.DetectUniform("U_ProjectiveTexture");
	projectedTextureProgram.DetectUniform("U_ProjectorMatrix");


	//init 3d model
	ObjModel obj, quad, sphere;
	obj.Init("res/model/Cube.obj");
	quad.Init("res/model/Quad.obj");
	sphere.Init("res/model/Sphere.obj");

	float identity[] = {
		1.0f,0,0,0,
		0,1.0f,0,0,
		0,0,1.0f,0,
		0,0,0,1.0f
	};


	glm::mat4 model = glm::translate<float>(6.0f, 0.0f, -6.0f) * glm::rotate(-30.0f, 1.0f, 1.0f, 1.0f);

	glm::mat4 quadModel = glm::translate<float>(6.0f, -1.5f, -6.0f) * glm::rotate(-90.0f, 1.0f, 0.0f, 0.0f) * glm::scale(10.0f, 10.0f, 10.0f);

	glm::mat4 sphereModel = glm::translate<float>(0.0f, 0.0f, 0.0f) * glm::scale(0.3f, 0.3f, 0.3f);


	glm::mat4 viewMatrix = glm::lookAt(glm::vec3(10.0f, 3.0f, 0.0f), glm::vec3(6.0f, -1.0f, -6.0f), glm::vec3(0.0f, 1.0f, 0.0f));
	glm::mat4 projectionMatrix = glm::perspective(50.0f, (float)viewportWidth / (float)viewportHeight, 0.1f, 1000.0f);

	glm::mat4 projectorMatrix = glm::translate<float>(0.5f, 0.5f, 0.5f)*glm::scale(0.5f, 0.5f, 0.5f) * projectionMatrix * viewMatrix;
	
	//³õʼ»¯fsq
	FullScreenQuad fsq;
	fsq.Init();

	//³õʼ»¯FBO
	FBO originalFbo;
	originalFbo.AttachColorBuffer("color", GL_COLOR_ATTACHMENT0, GL_RGBA, viewportWidth, viewportHeight);
	originalFbo.AttachDepthBuffer("depth", viewportWidth, viewportHeight);
	originalFbo.Finish();

	FBO projectiveTextureFbo;
	projectiveTextureFbo.AttachColorBuffer("color", GL_COLOR_ATTACHMENT0, GL_RGBA, viewportWidth, viewportHeight);
	projectiveTextureFbo.AttachDepthBuffer("depth", viewportWidth, viewportHeight);
	projectiveTextureFbo.Finish();
	
	GLuint mainTexture = SOIL_load_OGL_texture("res/image/stone.bmp", 0, 0, SOIL_FLAG_POWER_OF_TWO);
	GLuint projectiveTexture = SOIL_load_OGL_texture("res/image/grass.png", 0, 0, SOIL_FLAG_POWER_OF_TWO | SOIL_FLAG_INVERT_Y);

	ShowWindow(hwnd, SW_SHOW);
	UpdateWindow(hwnd);

	glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
	glEnable(GL_DEPTH_TEST);

	originalFbo.Bind();
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
	glUseProgram(sampleProgram.mProgram);
	glUniformMatrix4fv(sampleProgram.GetLocation("P"), 1, GL_FALSE, glm::value_ptr(projectionMatrix));
	glUniformMatrix4fv(sampleProgram.GetLocation("V"), 1, GL_FALSE, glm::value_ptr(viewMatrix));
	glUniformMatrix4fv(sampleProgram.GetLocation("M"), 1, GL_FALSE, glm::value_ptr(model));

	glBindTexture(GL_TEXTURE_2D, mainTexture);
	glUniform1i(sampleProgram.GetLocation("U_MainTexture"), 0);

	obj.Bind(sampleProgram.GetLocation("pos"), sampleProgram.GetLocation("texcoord"), sampleProgram.GetLocation("normal"));
	obj.Draw();

	glUniformMatrix4fv(sampleProgram.GetLocation("M"), 1, GL_FALSE, glm::value_ptr(quadModel));
	quad.Bind(sampleProgram.GetLocation("pos"), sampleProgram.GetLocation("texcoord"), sampleProgram.GetLocation("normal"));
	quad.Draw();
	originalFbo.Unbind();

	projectiveTextureFbo.Bind();
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
	glUseProgram(projectedTextureProgram.mProgram);
	glUniformMatrix4fv(projectedTextureProgram.GetLocation("P"), 1, GL_FALSE, glm::value_ptr(projectionMatrix));
	glUniformMatrix4fv(projectedTextureProgram.GetLocation("V"), 1, GL_FALSE, glm::value_ptr(viewMatrix));
	glUniformMatrix4fv(projectedTextureProgram.GetLocation("M"), 1, GL_FALSE, glm::value_ptr(model));

	glUniformMatrix4fv(projectedTextureProgram.GetLocation("U_ProjectorMatrix"), 1, GL_FALSE, glm::value_ptr(projectorMatrix));

	glActiveTexture(GL_TEXTURE0);
	glBindTexture(GL_TEXTURE_2D, mainTexture);
	glUniform1i(projectedTextureProgram.GetLocation("U_MainTexture"), 0);

	glActiveTexture(GL_TEXTURE1);
	glBindTexture(GL_TEXTURE_2D, projectiveTexture);
	glUniform1i(projectedTextureProgram.GetLocation("U_ProjectiveTexture"), 1);

	obj.Bind(projectedTextureProgram.GetLocation("pos"), projectedTextureProgram.GetLocation("texcoord"), projectedTextureProgram.GetLocation("normal"));
	obj.Draw();

	glUniformMatrix4fv(projectedTextureProgram.GetLocation("M"), 1, GL_FALSE, glm::value_ptr(quadModel));
	quad.Bind(projectedTextureProgram.GetLocation("pos"), projectedTextureProgram.GetLocation("texcoord"), projectedTextureProgram.GetLocation("normal"));
	quad.Draw();

	projectiveTextureFbo.Unbind();

	MSG msg;
	while (true)
	{
		if (PeekMessage(&msg, NULL, NULL, NULL, PM_REMOVE))
		{
			if (msg.message == WM_QUIT)
			{
				break;
			}
			TranslateMessage(&msg);
			DispatchMessage(&msg);
		}

		glClearColor(0.1f, 0.4f, 0.7f, 1.0f);
		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
		
		glUseProgram(originalProgram.mProgram);
		glActiveTexture(GL_TEXTURE0);
		glBindTexture(GL_TEXTURE_2D, originalFbo.GetBuffer("color"));
		glUniform1i(originalProgram.GetLocation("U_MainTexture"), 0);
		fsq.DrawToLeftTop(originalProgram.GetLocation("pos"), originalProgram.GetLocation("texcoord"));

		glUseProgram(originalProgram.mProgram);
		glActiveTexture(GL_TEXTURE0);
		glBindTexture(GL_TEXTURE_2D, projectiveTextureFbo.GetBuffer("color"));
		glUniform1i(originalProgram.GetLocation("U_MainTexture"), 0);
		fsq.DrawToRightTop(originalProgram.GetLocation("pos"), originalProgram.GetLocation("texcoord"));
		
		glFlush();
		SwapBuffers(dc);
	}
	return 0;
}