#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 = 800;
	rect.bottom = 600;
	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 depth render program
	GPUProgram depthRenderProgram;
	depthRenderProgram.AttachShader(GL_VERTEX_SHADER, "res/shader/fullscreenquad.vs");
	depthRenderProgram.AttachShader(GL_FRAGMENT_SHADER, "res/shader/depthrender.fs");
	depthRenderProgram.Link();
	depthRenderProgram.DetectAttribute("pos");
	depthRenderProgram.DetectAttribute("texcoord");
	depthRenderProgram.DetectUniform("U_MainTexture");

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

	//高斯模糊
	GPUProgram gaussianProgram;
	gaussianProgram.AttachShader(GL_VERTEX_SHADER, "res/shader/fullscreenquad.vs");
	gaussianProgram.AttachShader(GL_FRAGMENT_SHADER, "res/shader/fullscreenquad_gaussian.fs");
	gaussianProgram.Link();
	gaussianProgram.DetectAttribute("pos");
	gaussianProgram.DetectAttribute("texcoord");
	gaussianProgram.DetectUniform("U_MainTexture");

	//combine program
	GPUProgram combineProgram;
	combineProgram.AttachShader(GL_VERTEX_SHADER, "res/shader/fullscreenquad.vs");
	combineProgram.AttachShader(GL_FRAGMENT_SHADER, "res/shader/combine.fs");
	combineProgram.Link();
	combineProgram.DetectAttribute("pos");
	combineProgram.DetectAttribute("texcoord");
	combineProgram.DetectUniform("U_MainTexture");
	combineProgram.DetectUniform("U_HDRTexture");


	//init light source program
	GPUProgram lightSourceProgram;
	lightSourceProgram.AttachShader(GL_VERTEX_SHADER, "res/shader/lightSource.vs");
	lightSourceProgram.AttachShader(GL_FRAGMENT_SHADER, "res/shader/lightSource.fs");
	lightSourceProgram.Link();
	lightSourceProgram.DetectAttribute("pos");
	lightSourceProgram.DetectUniform("M");
	lightSourceProgram.DetectUniform("V");
	lightSourceProgram.DetectUniform("P");

	//init depth program
	GPUProgram depthProgram;
	depthProgram.AttachShader(GL_VERTEX_SHADER, "res/shader/sample_depth_buffer.vs");
	depthProgram.AttachShader(GL_FRAGMENT_SHADER, "res/shader/sample_depth_buffer.fs");
	depthProgram.Link();
	depthProgram.DetectAttribute("pos");
	depthProgram.DetectUniform("M");
	depthProgram.DetectUniform("V");
	depthProgram.DetectUniform("P");


	//init gpu program
	GPUProgram gpuProgram;
	gpuProgram.AttachShader(GL_VERTEX_SHADER, "res/shader/test.vs");
	gpuProgram.AttachShader(GL_FRAGMENT_SHADER, "res/shader/hdr.fs");
	gpuProgram.Link();

	gpuProgram.DetectAttribute("pos");
	gpuProgram.DetectAttribute("texcoord");
	gpuProgram.DetectAttribute("normal");
	gpuProgram.DetectUniform("M");
	gpuProgram.DetectUniform("V");
	gpuProgram.DetectUniform("P");
	gpuProgram.DetectUniform("NM");
	gpuProgram.DetectUniform("U_AmbientLightColor");
	gpuProgram.DetectUniform("U_AmbientMaterial");
	gpuProgram.DetectUniform("U_DiffuseLightColor");
	gpuProgram.DetectUniform("U_DiffuseMaterial");
	gpuProgram.DetectUniform("U_DiffuseIntensity");
	gpuProgram.DetectUniform("U_LightPos");
	gpuProgram.DetectUniform("U_LightDirection");
	gpuProgram.DetectUniform("U_Cutoff");
	gpuProgram.DetectUniform("U_SpecularLightColor");
	gpuProgram.DetectUniform("U_SpecularMaterial");
	gpuProgram.DetectUniform("U_EyePos");
	gpuProgram.DetectUniform("U_LightProjection");
	gpuProgram.DetectUniform("U_LightViewMatrix");
	gpuProgram.DetectUniform("U_ShadowMap");

	//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
	};

	float ambientLightColor[] = { 0.4f,0.4f,0.4f,1.0f };
	float ambientMaterial[] = { 0.2f,0.2f,0.2f,1.0f };
	float diffuseLightColor[] = { 1.0f,1.0f,1.0f,1.0f };
	float diffuseMaterial[] = { 0.8f, 0.8f, 0.8f, 1.0f };
	float lightPos[] = { 1.0f, 3.0f, -0.8f,1.0f };
	float diffuseIntensity = 2.0f;

	float spotLightDirection[] = { 0.0f, -1.0f, 0.0f, 128.0f };//把最后一位改成......
	float spotLightCutoff = 0.0f;


	float specularLightColor[] = { 1.0f,1.0f,1.0f,1.0f };
	float specularMaterial[] = { 1.0f,1.0f,1.0f,1.0f };
	float eyePos[] = { 0.0f, 0.0f, 0.0f };


	glm::mat4 model = glm::translate<float>(1.0f, 0.0f, 0.0f) * glm::rotate(-60.0f, 1.0f, 1.0f, 1.0f);
	glm::mat4 normalMatrix = glm::inverseTranspose(model);

	glm::mat4 quadModel = glm::translate<float>(0.0f, -1.5f, 0.0f) * glm::rotate(-90.0f, 1.0f, 0.0f, 0.0f) * glm::scale(8.0f, 8.0f, 8.0f);
	glm::mat4 quadNormalMatrix = glm::inverseTranspose(quadModel);

	glm::mat4 sphereModel = glm::translate<float>(lightPos[0], lightPos[1], lightPos[2]) * glm::scale(0.3f, 0.3f, 0.3f);
	glm::mat4 sphereNormalMatrix = glm::inverseTranspose(sphereModel);


	glm::mat4 viewMatrix = glm::lookAt(glm::vec3(0.5f, 1.9f, -8.0f), glm::vec3(0.0f, 0.0f, -1.0f), 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 lightMatrix = glm::lookAt(glm::vec3(lightPos[0], lightPos[1], lightPos[2]), glm::vec3(1.0f, 0.0f, 0.0f), glm::vec3(0.0f, 0.0f, -1.0f));
	glm::mat4 lightprojectionMatrix = glm::perspective(90.0f, (float)viewportWidth / (float)viewportHeight, 0.1f, 1000.0f);;//glm::ortho(-5.0f, 5.0f, -5.0f, 5.0f, 0.1f, 15.0f);

	//初始化fsq
	FullScreenQuad fsq;
	fsq.Init();

	//初始化FBO
	FBO fbo[2];
	fbo[0].AttachColorBuffer("color", GL_COLOR_ATTACHMENT0, GL_RGBA, viewportWidth, viewportHeight);
	fbo[0].AttachDepthBuffer("depth", viewportWidth, viewportHeight);
	fbo[0].Finish();
	fbo[1].AttachColorBuffer("color", GL_COLOR_ATTACHMENT0, GL_RGBA, viewportWidth, viewportHeight);
	fbo[1].AttachDepthBuffer("depth", viewportWidth, viewportHeight);
	fbo[1].Finish();

	FBO HDRfbo;
	HDRfbo.AttachColorBuffer("color", GL_COLOR_ATTACHMENT0, GL_RGBA, viewportWidth, viewportHeight);
	HDRfbo.AttachColorBuffer("hdrcolor", GL_COLOR_ATTACHMENT1, GL_RGBA16F, viewportWidth, viewportHeight);
	HDRfbo.AttachDepthBuffer("depth", viewportWidth, viewportHeight);
	HDRfbo.Finish();

	FBO depthfbo;
	depthfbo.AttachColorBuffer("color", GL_COLOR_ATTACHMENT0, GL_RGB, viewportWidth, viewportHeight);
	depthfbo.AttachDepthBuffer("depth", viewportWidth, viewportHeight);
	depthfbo.Finish();

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

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

	depthfbo.Bind();
	glUseProgram(depthProgram.mProgram);
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
	glUniformMatrix4fv(depthProgram.GetLocation("M"), 1, GL_FALSE, glm::value_ptr(model));
	glUniformMatrix4fv(depthProgram.GetLocation("V"), 1, GL_FALSE, glm::value_ptr(lightMatrix));
	glUniformMatrix4fv(depthProgram.GetLocation("P"), 1, GL_FALSE, glm::value_ptr(lightprojectionMatrix));
	obj.Bind(depthProgram.GetLocation("pos"), depthProgram.GetLocation("texcoord"), depthProgram.GetLocation("normal"));
	obj.Draw();

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

	glUseProgram(0);
	depthfbo.Unbind();

	HDRfbo.Bind();
	glUseProgram(gpuProgram.mProgram);
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
	glUniform4fv(gpuProgram.GetLocation("U_AmbientLightColor"), 1, ambientLightColor);
	glUniform4fv(gpuProgram.GetLocation("U_AmbientMaterial"), 1, ambientMaterial);
	glUniform4fv(gpuProgram.GetLocation("U_DiffuseLightColor"), 1, diffuseLightColor);
	glUniform4fv(gpuProgram.GetLocation("U_DiffuseMaterial"), 1, diffuseMaterial);
	glUniform1f(gpuProgram.GetLocation("U_DiffuseIntensity"), diffuseIntensity);
	glUniform4fv(gpuProgram.GetLocation("U_LightDirection"), 1, spotLightDirection);
	glUniform4fv(gpuProgram.GetLocation("U_SpecularLightColor"), 1, specularLightColor);
	glUniform4fv(gpuProgram.GetLocation("U_SpecularMaterial"), 1, specularMaterial);
	glUniform4fv(gpuProgram.GetLocation("U_LightPos"), 1, lightPos);
	glUniform3fv(gpuProgram.GetLocation("U_EyePos"), 1, eyePos);
	glUniform1f(gpuProgram.GetLocation("U_Cutoff"), spotLightCutoff);
	glUniformMatrix4fv(gpuProgram.GetLocation("M"), 1, GL_FALSE, glm::value_ptr(model));
	glUniformMatrix4fv(gpuProgram.GetLocation("V"), 1, GL_FALSE, glm::value_ptr(viewMatrix));
	glUniformMatrix4fv(gpuProgram.GetLocation("P"), 1, GL_FALSE, glm::value_ptr(projectionMatrix));
	glUniformMatrix4fv(gpuProgram.GetLocation("NM"), 1, GL_FALSE, glm::value_ptr(normalMatrix));
	glUniformMatrix4fv(gpuProgram.GetLocation("U_LightProjection"), 1, GL_FALSE, glm::value_ptr(lightprojectionMatrix));
	glUniformMatrix4fv(gpuProgram.GetLocation("U_LightViewMatrix"), 1, GL_FALSE, glm::value_ptr(lightMatrix));
	glBindTexture(GL_TEXTURE_2D, depthfbo.GetBuffer("depth"));
	glUniform1i(gaussianProgram.GetLocation("U_ShadowMap"), 0);

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

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


	glUseProgram(lightSourceProgram.mProgram);
	glUniformMatrix4fv(lightSourceProgram.GetLocation("M"), 1, GL_FALSE, glm::value_ptr(sphereModel));
	glUniformMatrix4fv(lightSourceProgram.GetLocation("V"), 1, GL_FALSE, glm::value_ptr(viewMatrix));
	glUniformMatrix4fv(lightSourceProgram.GetLocation("P"), 1, GL_FALSE, glm::value_ptr(projectionMatrix));
	sphere.Bind(lightSourceProgram.GetLocation("pos"), lightSourceProgram.GetLocation("texcoord"), lightSourceProgram.GetLocation("normal"));
	sphere.Draw();

	glUseProgram(0);
	HDRfbo.Unbind();

	/* blur start */
	fbo[0].Bind();
	glUseProgram(gaussianProgram.mProgram);
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
	glActiveTexture(GL_TEXTURE0);
	glBindTexture(GL_TEXTURE_2D, HDRfbo.GetBuffer("hdrcolor"));
	glUniform1i(gaussianProgram.GetLocation("U_MainTexture"), 0);
	fsq.Draw(gaussianProgram.GetLocation("pos"), gaussianProgram.GetLocation("texcoord"));
	fbo[0].Unbind();

	fbo[1].Bind();
	glUseProgram(gaussianProgram.mProgram);
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
	glActiveTexture(GL_TEXTURE0);
	glBindTexture(GL_TEXTURE_2D, fbo[0].GetBuffer("color"));
	glUniform1i(gaussianProgram.GetLocation("U_MainTexture"), 0);
	fsq.Draw(gaussianProgram.GetLocation("pos"), gaussianProgram.GetLocation("texcoord"));
	fbo[1].Unbind();

	fbo[0].Bind();
	glUseProgram(gaussianProgram.mProgram);
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
	glActiveTexture(GL_TEXTURE0);
	glBindTexture(GL_TEXTURE_2D, fbo[1].GetBuffer("color"));
	glUniform1i(gaussianProgram.GetLocation("U_MainTexture"), 0);
	fsq.Draw(gaussianProgram.GetLocation("pos"), gaussianProgram.GetLocation("texcoord"));
	fbo[0].Unbind();

	fbo[1].Bind();
	glUseProgram(gaussianProgram.mProgram);
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
	glActiveTexture(GL_TEXTURE0);
	glBindTexture(GL_TEXTURE_2D, fbo[0].GetBuffer("color"));
	glUniform1i(gaussianProgram.GetLocation("U_MainTexture"), 0);
	fsq.Draw(gaussianProgram.GetLocation("pos"), gaussianProgram.GetLocation("texcoord"));
	fbo[1].Unbind();
	/* blur end */


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

		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
		glActiveTexture(GL_TEXTURE0);

		glUseProgram(originalProgram.mProgram);
		glBindTexture(GL_TEXTURE_2D, HDRfbo.GetBuffer("color"));
		glUniform1i(originalProgram.GetLocation("U_MainTexture"), 0);
		fsq.DrawToLeftTop(originalProgram.GetLocation("pos"), originalProgram.GetLocation("texcoord"));

		glUseProgram(depthRenderProgram.mProgram);
		glBindTexture(GL_TEXTURE_2D, depthfbo.GetBuffer("depth"));
		glUniform1i(depthRenderProgram.GetLocation("U_MainTexture"), 0);
		fsq.DrawToRightTop(depthRenderProgram.GetLocation("pos"), depthRenderProgram.GetLocation("texcoord"));

		glUseProgram(gaussianProgram.mProgram);
		glBindTexture(GL_TEXTURE_2D, fbo[1].GetBuffer("color"));
		glUniform1i(gaussianProgram.GetLocation("U_MainTexture"), 0);
		fsq.DrawToLeftBottom(gaussianProgram.GetLocation("pos"), gaussianProgram.GetLocation("texcoord"));

		glUseProgram(combineProgram.mProgram);
		glActiveTexture(GL_TEXTURE0);
		glBindTexture(GL_TEXTURE_2D, HDRfbo.GetBuffer("color"));
		glUniform1i(combineProgram.GetLocation("U_MainTexture"), 0);
		glActiveTexture(GL_TEXTURE1);
		glBindTexture(GL_TEXTURE_2D, fbo[1].GetBuffer("color"));
		glUniform1i(combineProgram.GetLocation("U_HDRTexture"), 1);
		fsq.DrawToRightBottom(combineProgram.GetLocation("pos"), combineProgram.GetLocation("texcoord"));

		glFlush();
		SwapBuffers(dc);
	}
	return 0;
}