#include "Application.h"

#include <glad/glad.h>
#include <GLFW/glfw3.h>

#include <glm/mat4x4.hpp>
#include <glm/mat3x3.hpp>
#include <glm/gtc/matrix_transform.hpp>
#include <glm/gtc/type_ptr.hpp>
#include <imgui.h>
#include <imgui_impl_glfw_gl3.h>

#include <stb_image.h>

#include <stdlib.h>
#include <stdio.h>

#include <iostream>
#include <fstream>
#include <map>
#include <vector>

using glm::vec3;
using glm::uvec3;
using std::map;
using std::vector;

void calculateNormals(const vector<vec3> &vtx, vector<uvec3> &tri,
		vector<vec3> &normals) {
	normals.clear();
	normals.resize(vtx.size(), vec3(0));
	for (size_t i = 0; i < tri.size(); i++) {
		int a = tri[i].x, b = tri[i].y, c = tri[i].z;
		vec3 faceNormal = normalize(
				glm::cross(vtx[b] - vtx[a], vtx[c] - vtx[a]));
		normals[a] += faceNormal;
		normals[b] += faceNormal;
		normals[c] += faceNormal;
	}
	for (size_t i = 0; i < normals.size(); i++)
		normals[i] = glm::normalize(normals[i]);

}

void moveToMean(vector<vec3> &vtx) {
	vec3 mean(0);
	for (size_t i = 0; i < vtx.size(); i++) {
		mean += vtx[i];
	}
	mean *= vec3(1.f / vtx.size());
	for (size_t i = 0; i < vtx.size(); i++) {
		vtx[i] -= mean;
	}
}

void smooth(vector<vec3> &vtx, const vector<uvec3> &tri) {
	vector<vec3> cogs(vtx.size(), vec3(0.f));
	vector<int> valence(vtx.size(), 0);

	for (size_t iTri = 0; iTri < tri.size(); iTri++) {
		const uvec3 &idx = tri[iTri];
		for (size_t iE = 0; iE < 3; iE++) {
			valence[idx[iE]] += 2;
			cogs[idx[iE]] += vtx[idx[(iE + 1) % 3]];
			cogs[idx[iE]] += vtx[idx[(iE + 2) % 3]];
		}
	}
	/*
	 for (v_it = mesh.vertices_begin(); v_it != v_end; ++v_it) {
	 cog[0] = cog[1] = cog[2] = valence = 0.0;

	 for (vv_it = mesh.vv_iter(*v_it); vv_it.is_valid(); ++vv_it) {
	 cog += mesh.point(*vv_it);
	 ++valence;
	 }
	 cogs.push_back(cog / valence);
	 }
	 for (v_it = mesh.vertices_begin(), cog_it = cogs.begin(); v_it != v_end;
	 ++v_it, ++cog_it)
	 if (!mesh.is_boundary(*v_it))
	 mesh.set_point(*v_it, *cog_it);

	 */
	for (size_t i = 0; i < vtx.size(); i++) {
//		vtx[i] = vtx[i] * vec3(0.8)
//				+ cogs[i] * vec3(0.2f / valence[i]);
		vtx[i] = cogs[i] * vec3(1.f / valence[i]);
	}
}

void saveAttrib(std::ostream &out, const char *prefix, vector<vec3> &elements) {
	for (size_t i = 0; i < elements.size(); i++) {
		out << prefix << elements[i].x << " " << elements[i].y << " "
				<< elements[i].z << "\n";
	}
}

void saveAttrib(std::ostream &out, const char *prefix,
		vector<glm::vec2> &elements) {
	for (size_t i = 0; i < elements.size(); i++) {
		out << prefix << elements[i].x << " " << elements[i].y << "\n";
	}
}

void saveFaces(std::ostream &out, const vector<uvec3> &tris, size_t attribs) {
	for (size_t i = 0; i < tris.size(); i++) {
		out << "f";

		for (size_t j = 0; j < 3; j++) {
			int v = tris[i][j] + 1;
			out << " " << v;
			if (attribs > 1)
				out << "/" << v;
			if (attribs > 2)
				out << "/" << v;
			out << " ";
		}

		out << "\n";
	}
}

void calculateEdges(const vector<vec3> &vtx, vector<uvec3> &tri,
		vector<glm::uvec4> &edges) {
	edges.clear();
	map<std::pair<uint32_t, uint32_t>, uint32_t> edgeMap;
	for (size_t iTri = 0; iTri < tri.size(); iTri++) {
		uvec3 idx = tri[iTri];
		for (size_t k = 0; k < 3; k++) {
			int a = idx[k];
			int b = idx[(k + 1) % 3];
			glm::uvec4 edge1(std::min(a, b), std::max(a, b), iTri, 0);
			auto it1 = edgeMap.find(std::make_pair(edge1.x, edge1.y));
			if (it1 != edgeMap.end()) {
				edges[it1->second].z = iTri;
			} else {
				edges.push_back(edge1);
			}
		}
	}
}

void computeTangentBasis(vector<vec3> & vertices, vector<glm::vec2> & uvs,
		vector<vec3> & normals, vector<vec3> & tangents,
		vector<vec3> & bitangents) {

	for (size_t i = 0; i < vertices.size(); i += 3) {

		// Shortcuts for vertices
		vec3 & v0 = vertices[i + 0];
		vec3 & v1 = vertices[i + 1];
		vec3 & v2 = vertices[i + 2];

		// Shortcuts for UVs
		glm::vec2 & uv0 = uvs[i + 0];
		glm::vec2 & uv1 = uvs[i + 1];
		glm::vec2 & uv2 = uvs[i + 2];

		// Edges of the triangle : postion delta
		vec3 deltaPos1 = v1 - v0;
		vec3 deltaPos2 = v2 - v0;

		// UV delta
		glm::vec2 deltaUV1 = uv1 - uv0;
		glm::vec2 deltaUV2 = uv2 - uv0;

		float r = 1.0f / (deltaUV1.x * deltaUV2.y - deltaUV1.y * deltaUV2.x);
		vec3 tangent = (deltaPos1 * deltaUV2.y - deltaPos2 * deltaUV1.y) * r;
		vec3 bitangent = (deltaPos2 * deltaUV1.x - deltaPos1 * deltaUV2.x) * r;
		// Set the same tangent for all three vertices of the triangle.
		// They will be merged later, in vboindexer.cpp
		tangents.push_back(tangent);
		tangents.push_back(tangent);
		tangents.push_back(tangent);

		// Same thing for binormals
		bitangents.push_back(bitangent);
		bitangents.push_back(bitangent);
		bitangents.push_back(bitangent);

	}
}

static bool glck(const char* call) {
	int err = glGetError();
	if (err == 0) {
		return true;
	} else {
		switch (err) {
		case GL_INVALID_VALUE:
			printf("GL_INVALID_VALUE: %s\n", call);
			break;
		case GL_INVALID_ENUM:
			printf("GL_INVALID_ENUM: %s\n", call);
			break;
		case GL_INVALID_OPERATION:
			printf("GL_INVALID_OPERATION: %s\n", call);
			break;
		default:
			printf("UNKNOWN Error: %s\n", call);
		}
		return false;
	}
}

#define GLCK(a) {a; assert(glck(#a));}

static void error_callback(int error, const char* description) {
	fprintf(stderr, "Error: %s\n", description);
}
static void key_callback(GLFWwindow* window, int key, int scancode, int action,
		int mods) {
	Application::instance().KeyCallback(window, key, scancode, action, mods);
}

static void mouse_button_callback(GLFWwindow* window, int button, int action,
		int mods) {
	Application::instance().MouseButtonCallback(window, button, action, mods);

}
static void scroll_callback(GLFWwindow* window, double xoffset,
		double yoffset) {
	Application::instance().ScrollCallback(window, xoffset, yoffset);
}

static void char_callback(GLFWwindow* window, unsigned int c) {
	Application::instance().CharCallback(window, c);
}

Application::Application() :
		window(0), density(), densityIsolevel(0.2), polygonizer(density,
				densityIsolevel), textureSize(512), texturemapper(density,
				textureSize), programId(0), vPositionLoc(-1), vTexCoordLoc(-1), vNormalLoc(
				-1), meteoridCount(1000), meteroidMinRadius(0.005), meteroidMaxRadius(
				0.2), meteroidSizeExponent(2048), densityFrequency(2), densityOctave(
				2), densityScale(1.0f), resolution(0.1), viewDistance(3.0f), fpsMode(
				false) {
	init();
}

Application::~Application() {
	shutdown();
}

Application &Application::instance() {
	static Application app;
	return app;
}

void Application::init() {
	glfwSetErrorCallback(error_callback);

	if (!glfwInit())
		exit(EXIT_FAILURE);

	//	glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
	glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
	glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
	glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);

	window = glfwCreateWindow(1200, 800, "Procedural Asteroid Generator", NULL,
	NULL);
	if (!window) {
		glfwTerminate();
		exit(EXIT_FAILURE);
	}

	GLFWimage icon;
	int n;
	icon.pixels = stbi_load("icon.png", &icon.width, &icon.height, &n, 4);
	if (icon.pixels) {
		glfwSetWindowIcon(window, 1, &icon);
		stbi_image_free(icon.pixels);
	} else
		std::cout << "Failed to load icon.png" << std::endl;

	glfwSetMouseButtonCallback(window, mouse_button_callback);
	glfwSetScrollCallback(window, scroll_callback);
	glfwSetKeyCallback(window, key_callback);
	glfwSetCharCallback(window, char_callback);

	glfwMakeContextCurrent(window);
	gladLoadGLLoader((GLADloadproc) glfwGetProcAddress);
	glfwSwapInterval(1);

	std::cout << "OpenGL version: " << glGetString(GL_VERSION) << std::endl;
	std::cout << "GLSL version: " << glGetString(GL_SHADING_LANGUAGE_VERSION)
			<< std::endl;
	std::cout << "Vendor: " << glGetString(GL_VENDOR) << std::endl;
	std::cout << "Renderer: " << glGetString(GL_RENDERER) << std::endl;

	ImGui_ImplGlfwGL3_Init(window, false);

	GLCK(glGenVertexArrays(1, &vertexArrayId))
	GLCK(glGenBuffers(1, &vPositionId))
	GLCK(glGenBuffers(1, &vTexCoordId))
	GLCK(glGenBuffers(1, &vNormalId))
	GLCK(glGenBuffers(1, &indexBufferId))

	GLCK(glGenTextures(1, &tAlbedoId))
	GLCK(glGenTextures(1, &tNormalId))
	GLCK(glGenTextures(1, &tRoughnessId))
	GLCK(glGenTextures(1, &tMetalicId))

	loadShader();
	updateVertexArrayObject();
	generateAsteroid();
	uploadMesh();
}

void Application::shutdown() {
	ImGui_ImplGlfwGL3_Shutdown();

	GLCK(glDeleteBuffers(1, &vPositionId))
	GLCK(glDeleteBuffers(1, &vTexCoordId))
	GLCK(glDeleteBuffers(1, &vNormalId))
	GLCK(glDeleteBuffers(1, &indexBufferId))
	GLCK(glDeleteVertexArrays(1, &vertexArrayId))

	glfwDestroyWindow(window);
	glfwTerminate();
}

void Application::KeyCallback(GLFWwindow* window, int key, int scancode,
		int action, int mods) {
	if (key == GLFW_KEY_ESCAPE && action == GLFW_RELEASE)
		glfwSetWindowShouldClose(window, GLFW_TRUE);
	if (ImGui::IsMouseHoveringAnyWindow())
		ImGui_ImplGlfwGL3_KeyCallback(window, key, scancode, action, mods);
	else {
		if (key == GLFW_KEY_TAB && action == GLFW_RELEASE) {
			toogleFpsMode();
		}
	}
}

void Application::MouseButtonCallback(GLFWwindow* window, int button,
		int action, int mods) {
	ImGui_ImplGlfwGL3_MouseButtonCallback(window, button, action, mods);
}
void Application::ScrollCallback(GLFWwindow* window, double xoffset,
		double yoffset) {
	if (ImGui::IsMouseHoveringAnyWindow())
		ImGui_ImplGlfwGL3_ScrollCallback(window, xoffset, yoffset);
	else
		viewDistance -= yoffset * viewDistance * 0.1;
}
void Application::CharCallback(GLFWwindow* window, unsigned int c) {

	ImGui_ImplGlfwGL3_CharCallback(window, c);
}

void Application::toogleFpsMode() {
	if (fpsMode) {
		fpsMode = false;
	} else {
		fpsMode = true;
		fpsTrafo = glm::lookAt(vec3(0, 0, viewDistance), vec3(0, 0, 0),
				vec3(0, 1, 0));
	}
}

void Application::generateAsteroid() {
	std::srand(123);

	if (density.getImpacts().size() == 0)
		density.addRandomImpacts(1000, 0.2, 0.01, 0.005, 0.2, 4096);
	//density.saveCrossSection("density.png", 512);

	polygonizer.polygonize(resolution);
	{
		std::ofstream out("stage1.obj");
		saveAttrib(out, "v ", polygonizer.vertices);
		saveFaces(out, polygonizer.indices, 1);
	}

	smooth(polygonizer.vertices, polygonizer.indices);
	{
		std::ofstream out("stage2.obj");
		saveAttrib(out, "v ", polygonizer.vertices);
		saveFaces(out, polygonizer.indices, 1);
	}
	calculateNormals(polygonizer.vertices, polygonizer.indices, normals);
	{
		std::ofstream out("stage3.obj");
		saveAttrib(out, "v ", polygonizer.vertices);
		saveAttrib(out, "vn ", normals);
		saveFaces(out, polygonizer.indices, 2);
	}

	vector<glm::uvec4> edges;
	std::cout << "Vertices: " << polygonizer.vertices.size() << std::endl;
	std::cout << "Triangles: " << polygonizer.indices.size() << std::endl;

	texturemapper.map(polygonizer.vertices, normals, polygonizer.indices);
	moveToMean(texturemapper.vertices);

	{
		std::ofstream out("stage4.obj");
		saveAttrib(out, "v ", texturemapper.vertices);
		saveAttrib(out, "vn ", texturemapper.normals);
		saveAttrib(out, "vt ", texturemapper.texcoords);
		saveFaces(out, texturemapper.indices, 3);
	}
}

bool Application::bindVertexAttrib(GLuint id, GLint loc, GLuint size) {
	if (loc < 0)
		return false;
	GLCK(glBindBuffer(GL_ARRAY_BUFFER, id))
	GLCK(glEnableVertexAttribArray(loc))
	GLCK(glVertexAttribPointer(loc,                  // attribute
			size,// size
			GL_FLOAT,// type
			GL_FALSE,// normalized?
			0,// stride
			(void* ) 0// array buffer offset
			))
	return true;
}

void Application::updateVertexArrayObject() {
	GLCK(glBindVertexArray(vertexArrayId))

	if (vPositionLoc >= 0)
		GLCK(glDisableVertexAttribArray(vPositionLoc))
	if (vNormalLoc >= 0)
		GLCK(glDisableVertexAttribArray(vNormalLoc))
	if (vTexCoordLoc >= 0)
		GLCK(glDisableVertexAttribArray(vTexCoordLoc))

	bindVertexAttrib(vPositionId, vPositionLoc, 3);
	bindVertexAttrib(vNormalId, vNormalLoc, 3);
	bindVertexAttrib(vTexCoordId, vTexCoordLoc, 2);

	GLCK(glBindVertexArray(0))
}

GLuint Application::loadProgram(const std::string &name) {

	// Create the shaders
	GLuint VertexShaderID = glCreateShader(GL_VERTEX_SHADER);
	GLuint FragmentShaderID = glCreateShader(GL_FRAGMENT_SHADER);

	// Read the Vertex Shader code from the file
	std::string VertexShaderCode;
	std::string vertex_file_path = "shader/" + name + ".vertex.glsl";
	std::ifstream VertexShaderStream(vertex_file_path, std::ios::in);
	if (VertexShaderStream.is_open()) {
		std::string Line = "";
		while (getline(VertexShaderStream, Line))
			VertexShaderCode += "\n" + Line;
		VertexShaderStream.close();
	} else {
		std::cout << "Failed to open " << vertex_file_path << std::endl;
		return 0;
	}

	// Read the Fragment Shader code from the file
	std::string FragmentShaderCode;
	std::string fragment_file_path = "shader/" + name + ".fragment.glsl";
	std::ifstream FragmentShaderStream(fragment_file_path, std::ios::in);
	if (FragmentShaderStream.is_open()) {
		std::string Line = "";
		while (getline(FragmentShaderStream, Line))
			FragmentShaderCode += "\n" + Line;
		FragmentShaderStream.close();
	} else {
		std::cout << "Failed to open " << vertex_file_path << std::endl;
		return 0;
	}

	GLint Result = GL_FALSE;
	int InfoLogLength;

	// Compile Vertex Shader
	std::cout << "Compiling vertex shader : " << name << std::endl;
	char const * VertexSourcePointer = VertexShaderCode.c_str();
	glShaderSource(VertexShaderID, 1, &VertexSourcePointer, NULL);
	glCompileShader(VertexShaderID);

	// Check Vertex Shader
	glGetShaderiv(VertexShaderID, GL_COMPILE_STATUS, &Result);
	glGetShaderiv(VertexShaderID, GL_INFO_LOG_LENGTH, &InfoLogLength);
	if (InfoLogLength > 0) {
		vector<char> VertexShaderErrorMessage(InfoLogLength + 1);
		glGetShaderInfoLog(VertexShaderID, InfoLogLength, NULL,
				&VertexShaderErrorMessage[0]);
		printf("%s\n", &VertexShaderErrorMessage[0]);
	}

	// Compile Fragment Shader
	std::cout << "Compiling fragment shader : " << name << std::endl;

	char const * FragmentSourcePointer = FragmentShaderCode.c_str();
	glShaderSource(FragmentShaderID, 1, &FragmentSourcePointer, NULL);
	glCompileShader(FragmentShaderID);

	// Check Fragment Shader
	glGetShaderiv(FragmentShaderID, GL_COMPILE_STATUS, &Result);
	glGetShaderiv(FragmentShaderID, GL_INFO_LOG_LENGTH, &InfoLogLength);
	if (InfoLogLength > 0) {
		vector<char> FragmentShaderErrorMessage(InfoLogLength + 1);
		glGetShaderInfoLog(FragmentShaderID, InfoLogLength, NULL,
				&FragmentShaderErrorMessage[0]);
		printf("%s\n", &FragmentShaderErrorMessage[0]);
	}

	// Link the program
	std::cout << "Linking program : " << name << std::endl;

	GLuint ProgramID = glCreateProgram();
	glAttachShader(ProgramID, VertexShaderID);
	glAttachShader(ProgramID, FragmentShaderID);
	glLinkProgram(ProgramID);

	// Check the program
	glGetProgramiv(ProgramID, GL_LINK_STATUS, &Result);
	glGetProgramiv(ProgramID, GL_INFO_LOG_LENGTH, &InfoLogLength);
	if (InfoLogLength > 0) {
		vector<char> ProgramErrorMessage(InfoLogLength + 1);
		glGetProgramInfoLog(ProgramID, InfoLogLength, NULL,
				&ProgramErrorMessage[0]);
		printf("%s\n", &ProgramErrorMessage[0]);
	}

	glDetachShader(ProgramID, VertexShaderID);
	glDetachShader(ProgramID, FragmentShaderID);

	glDeleteShader(VertexShaderID);
	glDeleteShader(FragmentShaderID);

	return ProgramID;
}

void Application::loadShader() {
	if (programId >= 0)
		GLCK(glDeleteProgram(programId))
	programId = loadProgram("standard");

	GLCK(MVPloc = glGetUniformLocation(programId, "MVP"))
	GLCK(Mloc = glGetUniformLocation(programId, "M"))
	GLCK(Vloc = glGetUniformLocation(programId, "V"))
	GLCK(
			LightPosition_worldspaceloc = glGetUniformLocation(programId, "LightPosition_worldspace"))

	GLCK(vPositionLoc = glGetAttribLocation(programId, "vPosition"))
	GLCK(vTexCoordLoc = glGetAttribLocation(programId, "vTexCoord"))
	GLCK(vNormalLoc = glGetAttribLocation(programId, "vNormal"))

	GLCK(tAlbedoLoc = glGetAttribLocation(programId, "tAlbedo"))
	GLCK(tNormalLoc = glGetAttribLocation(programId, "tNormal"))
	GLCK(tRoughnessLoc = glGetAttribLocation(programId, "tRoughness"))
	GLCK(tMetalicLoc = glGetAttribLocation(programId, "tMetalic"))
}

void Application::uploadMesh() {
	GLCK(glBindVertexArray(vertexArrayId))

	GLCK(glBindBuffer(GL_ARRAY_BUFFER, vPositionId))
	GLCK(
			glBufferData(GL_ARRAY_BUFFER, texturemapper.vertices.size() * sizeof(vec3), texturemapper.vertices.data(), GL_STATIC_DRAW))

	GLCK(glBindBuffer(GL_ARRAY_BUFFER, vTexCoordId))
	GLCK(
			glBufferData(GL_ARRAY_BUFFER, texturemapper.texcoords.size() * sizeof(glm::vec2), texturemapper.texcoords.data(), GL_STATIC_DRAW))

	GLCK(glBindBuffer(GL_ARRAY_BUFFER, vNormalId))
	GLCK(
			glBufferData(GL_ARRAY_BUFFER, texturemapper.normals.size() * sizeof(vec3), texturemapper.normals.data(), GL_STATIC_DRAW))

	GLCK(glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, indexBufferId))
	GLCK(
			glBufferData(GL_ELEMENT_ARRAY_BUFFER, texturemapper.indices.size() * sizeof(uvec3), texturemapper.indices.data(), GL_STATIC_DRAW))

	GLCK(glBindVertexArray(0))

	glBindTexture(GL_TEXTURE_2D, tAlbedoId);
	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, texturemapper.getTextureSize(),
			texturemapper.getTextureSize(), 0, GL_BGR, GL_UNSIGNED_BYTE,
			texturemapper.albedo.data());
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
}

void Application::renderMesh() {
	GLCK(glBindVertexArray(vertexArrayId))
	GLCK(
			glDrawElements(GL_TRIANGLES, texturemapper.indices.size() * 3, GL_UNSIGNED_INT, (void* ) 0))
	GLCK(glBindVertexArray(0))

}

void Application::prepareShader() {
	glm::mat4 model(1.0f);
	glm::mat4 view;

	if (fpsMode) {
		glm::vec4 movement(0.0);
		if (fpsMode) {
			if (glfwGetKey(window, GLFW_KEY_W) == GLFW_PRESS) {
				movement += glm::vec4(0.0, 0.0, 0.1, 0.0);
			} else if (glfwGetKey(window, GLFW_KEY_S) == GLFW_PRESS) {
				movement -= glm::vec4(0.0, 0.0, 0.1, 0.0);
			}
		}
		glm::vec3 absolute = glm::transpose(fpsTrafo) * movement;
		fpsTrafo = glm::translate(fpsTrafo, absolute);
		view = fpsTrafo;
	} else {
		model = glm::rotate(model, (float) glfwGetTime(), vec3(0.f, 1.f, 0.f));

		view = glm::lookAt(vec3(0, 0, viewDistance), // Camera is at (4,3,3), in World Space
		vec3(0, 0, 0), // and looks at the origin
		vec3(0, 1, 0) // Head is up (set to 0,-1,0 to look upside-down)
				);
	}
	glm::mat4 perspective = glm::perspective(glm::radians(45.0f),
			(float) width / (float) height, 0.1f, 100.0f);
	glm::mat4 mvp = perspective * view * model;

	GLCK(glUseProgram(programId))
	if (MVPloc >= 0) {
		GLCK(glUniformMatrix4fv(MVPloc, 1, GL_FALSE, glm::value_ptr(mvp)))
	}
	if (Mloc >= 0) {
		GLCK(glUniformMatrix4fv(Mloc, 1, GL_FALSE, glm::value_ptr(model)))
	}
	if (Vloc >= 0) {
		GLCK(glUniformMatrix4fv(Vloc, 1, GL_FALSE, glm::value_ptr(view)))
	}
	if (LightPosition_worldspaceloc >= 0) {
		vec3 LightPosition_worldspace(10.0f, 10.0f, 10.0f);
		GLCK(
				glUniform3fv(LightPosition_worldspaceloc, 1, glm::value_ptr(LightPosition_worldspace)))
	}

	int idx = 0;
	if (tAlbedoLoc >= 0) {
		glUniform1i(tAlbedoLoc, idx);
		glActiveTexture(GL_TEXTURE0 + idx);
		glBindTexture(GL_TEXTURE_2D, tAlbedoId);
		idx++;
	}
	if (tNormalLoc >= 0) {
		glUniform1i(tNormalLoc, idx);
		glActiveTexture(GL_TEXTURE0 + idx);
		glBindTexture(GL_TEXTURE_2D, tNormalId);
		idx++;
	}
	if (tRoughnessLoc >= 0) {
		glUniform1i(tRoughnessLoc, idx);
		glActiveTexture(GL_TEXTURE0 + idx);
		glBindTexture(GL_TEXTURE_2D, tRoughnessId);
		idx++;
	}
	if (tMetalicLoc >= 0) {
		glUniform1i(tMetalicLoc, idx);
		glActiveTexture(GL_TEXTURE0 + idx);
		glBindTexture(GL_TEXTURE_2D, tMetalicId);
		idx++;
	}
}

void Application::gui() {
	ImGui::Begin("Mesh Generation");
	ImGui::Text("Vertices: %lu, Triangles: %lu", polygonizer.vertices.size(),
			polygonizer.indices.size());
	//ImGui::InputFloat("Resolution", &resolution);
	ImGui::SliderFloat("Resolution", &resolution, 0.1, 0.001, "%.3f", 0.1);
	if (ImGui::SliderFloat("Frequency", &densityFrequency, 1, 10, "%.0f", 1))
		density.setFrequency(densityFrequency);
	if (ImGui::SliderFloat("Octave", &densityOctave, 1, 10, "%.0f", 1))
		density.setOctave(densityOctave);

	//	if (ImGui::InputFloat("Frequency", &densityFrequency))
//	if (ImGui::InputFloat("Octave", &densityOctave))
//		density.setOctave(densityOctave);

	static const char *textureSizesStrings[] = { "512", "1024", "2048", "4096" };
	static const int textureSizes[] = { 512, 1024, 2048, 4096 };
	static int currentTextureSize = 0;
	if (ImGui::Combo("Texture Size", &currentTextureSize, textureSizesStrings,
			4, -1)) {
		texturemapper.setTextureSize(textureSizes[currentTextureSize]);
	}

	if (ImGui::Button("Generate")) {
		generateAsteroid();
		uploadMesh();
	}
	ImGui::End();

	ImGui::Begin("Rendering");
	if (ImGui::Button("Reload Shader")) {
		loadShader();
		updateVertexArrayObject();
	}
	if (ImGui::Button("Wireframe"))
		glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
	if (ImGui::Button("Fill"))
		glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
	ImGui::Text("Application average %.3f ms/frame (%.1f FPS)",
			1000.0f / ImGui::GetIO().Framerate, ImGui::GetIO().Framerate);
	ImGui::End();

	ImGui::Begin("Textures");
	ImGui::Image((ImTextureID) (intptr_t) tAlbedoId,
			ImVec2(ImGui::GetWindowContentRegionMax().x,
					ImGui::GetWindowContentRegionMax().x));
	ImGui::End();
}

void Application::run() {

	while (!glfwWindowShouldClose(window)) {
		glfwPollEvents();
		glfwGetFramebufferSize(window, &width, &height);
		ImGui_ImplGlfwGL3_NewFrame();

		gui();

		glViewport(0, 0, width, height);
		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
		glEnable(GL_DEPTH_TEST);
		glDepthFunc(GL_LESS);
		glEnable(GL_CULL_FACE);

		prepareShader();
		renderMesh();

		ImGui::Render();
		glfwSwapBuffers(window);

	}
}