582 lines
17 KiB
C++
582 lines
17 KiB
C++
#include "Application.h"
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#include "Mesh.h"
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#include <glad/glad.h>
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#include <GLFW/glfw3.h>
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#include <glm/mat4x4.hpp>
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#include <glm/mat3x3.hpp>
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#include <glm/gtc/matrix_transform.hpp>
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#include <glm/gtc/type_ptr.hpp>
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#include <imgui.h>
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#include <imgui_impl_glfw_gl3.h>
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#include <stb_image.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <iostream>
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#include <fstream>
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#include <map>
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#include <vector>
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using glm::vec3;
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using glm::uvec3;
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using std::map;
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using std::vector;
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static bool glck(const char* call) {
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int err = glGetError();
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if (err == 0) {
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return true;
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} else {
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switch (err) {
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case GL_INVALID_VALUE:
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printf("GL_INVALID_VALUE: %s\n", call);
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break;
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case GL_INVALID_ENUM:
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printf("GL_INVALID_ENUM: %s\n", call);
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break;
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case GL_INVALID_OPERATION:
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printf("GL_INVALID_OPERATION: %s\n", call);
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break;
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default:
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printf("UNKNOWN Error: %s\n", call);
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}
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return false;
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}
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}
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#define GLCK(a) {a; assert(glck(#a));}
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static void error_callback(int error, const char* description) {
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fprintf(stderr, "Error: %s\n", description);
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}
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static void key_callback(GLFWwindow* window, int key, int scancode, int action,
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int mods) {
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Application::instance().KeyCallback(window, key, scancode, action, mods);
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}
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static void mouse_button_callback(GLFWwindow* window, int button, int action,
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int mods) {
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Application::instance().MouseButtonCallback(window, button, action, mods);
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}
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static void scroll_callback(GLFWwindow* window, double xoffset,
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double yoffset) {
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Application::instance().ScrollCallback(window, xoffset, yoffset);
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}
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static void char_callback(GLFWwindow* window, unsigned int c) {
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Application::instance().CharCallback(window, c);
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}
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Application::Application() :
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window(0), density(), densityIsolevel(0.2), polygonizer(density,
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densityIsolevel), textureSize(512), texturemapper(density,
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textureSize), programId(0), vPositionLoc(-1), vTexCoordLoc(-1), vNormalLoc(
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-1), meteoridCount(1000), meteroidMinRadius(0.005), meteroidMaxRadius(
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0.2), meteroidSizeExponent(2048), densityFrequency(2), densityOctave(
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2), densityScale(1.0f), resolution(0.1), viewDistance(3.0f), fpsMode(
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false) {
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init();
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}
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Application::~Application() {
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shutdown();
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}
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Application &Application::instance() {
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static Application app;
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return app;
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}
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void Application::init() {
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glfwSetErrorCallback(error_callback);
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if (!glfwInit())
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exit(EXIT_FAILURE);
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// glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
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glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
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glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
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glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
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window = glfwCreateWindow(1200, 800, "Procedural Asteroid Generator", NULL,
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NULL);
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if (!window) {
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glfwTerminate();
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exit(EXIT_FAILURE);
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}
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GLFWimage icon;
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int n;
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icon.pixels = stbi_load("icon.png", &icon.width, &icon.height, &n, 4);
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if (icon.pixels) {
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glfwSetWindowIcon(window, 1, &icon);
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stbi_image_free(icon.pixels);
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} else
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std::cout << "Failed to load icon.png" << std::endl;
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glfwSetMouseButtonCallback(window, mouse_button_callback);
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glfwSetScrollCallback(window, scroll_callback);
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glfwSetKeyCallback(window, key_callback);
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glfwSetCharCallback(window, char_callback);
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glfwMakeContextCurrent(window);
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gladLoadGLLoader((GLADloadproc) glfwGetProcAddress);
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glfwSwapInterval(1);
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std::cout << "OpenGL version: " << glGetString(GL_VERSION) << std::endl;
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std::cout << "GLSL version: " << glGetString(GL_SHADING_LANGUAGE_VERSION)
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<< std::endl;
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std::cout << "Vendor: " << glGetString(GL_VENDOR) << std::endl;
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std::cout << "Renderer: " << glGetString(GL_RENDERER) << std::endl;
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ImGui_ImplGlfwGL3_Init(window, false);
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GLCK(glGenVertexArrays(1, &vertexArrayId))
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GLCK(glGenBuffers(1, &vPositionId))
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GLCK(glGenBuffers(1, &vTexCoordId))
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GLCK(glGenBuffers(1, &vNormalId))
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GLCK(glGenBuffers(1, &indexBufferId))
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GLCK(glGenTextures(1, &tAlbedoId))
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GLCK(glGenTextures(1, &tNormalId))
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GLCK(glGenTextures(1, &tRoughnessId))
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GLCK(glGenTextures(1, &tMetalicId))
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loadShader();
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updateVertexArrayObject();
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generateAsteroid();
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uploadMesh();
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}
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void Application::shutdown() {
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ImGui_ImplGlfwGL3_Shutdown();
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GLCK(glDeleteBuffers(1, &vPositionId))
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GLCK(glDeleteBuffers(1, &vTexCoordId))
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GLCK(glDeleteBuffers(1, &vNormalId))
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GLCK(glDeleteBuffers(1, &indexBufferId))
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GLCK(glDeleteVertexArrays(1, &vertexArrayId))
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glfwDestroyWindow(window);
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glfwTerminate();
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}
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void Application::KeyCallback(GLFWwindow* window, int key, int scancode,
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int action, int mods) {
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if (key == GLFW_KEY_ESCAPE && action == GLFW_RELEASE)
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glfwSetWindowShouldClose(window, GLFW_TRUE);
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if (ImGui::IsMouseHoveringAnyWindow())
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ImGui_ImplGlfwGL3_KeyCallback(window, key, scancode, action, mods);
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else {
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if (key == GLFW_KEY_TAB && action == GLFW_RELEASE) {
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toogleFpsMode();
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}
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}
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}
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void Application::MouseButtonCallback(GLFWwindow* window, int button,
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int action, int mods) {
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ImGui_ImplGlfwGL3_MouseButtonCallback(window, button, action, mods);
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}
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void Application::ScrollCallback(GLFWwindow* window, double xoffset,
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double yoffset) {
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if (ImGui::IsMouseHoveringAnyWindow())
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ImGui_ImplGlfwGL3_ScrollCallback(window, xoffset, yoffset);
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else
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viewDistance -= yoffset * viewDistance * 0.1;
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}
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void Application::CharCallback(GLFWwindow* window, unsigned int c) {
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ImGui_ImplGlfwGL3_CharCallback(window, c);
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}
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void Application::toogleFpsMode() {
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if (fpsMode) {
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fpsMode = false;
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} else {
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fpsMode = true;
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fpsTrafo = glm::lookAt(vec3(0, 0, viewDistance), vec3(0, 0, 0),
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vec3(0, 1, 0));
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}
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}
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void Application::generateAsteroid() {
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std::srand(123);
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if (density.getImpacts().size() == 0)
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density.addRandomImpacts(1000, 0.2, 0.01, 0.005, 0.2, 4096);
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//density.saveCrossSection("density.png", 512);
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polygonizer.polygonize(resolution);
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{
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std::ofstream out("stage1.obj");
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saveAttrib(out, "v ", polygonizer.vertices);
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saveFaces(out, polygonizer.indices, 1);
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}
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smooth(polygonizer.vertices, polygonizer.indices);
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{
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std::ofstream out("stage2.obj");
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saveAttrib(out, "v ", polygonizer.vertices);
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saveFaces(out, polygonizer.indices, 1);
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}
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calculateNormals(polygonizer.vertices, polygonizer.indices, normals);
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{
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std::ofstream out("stage3.obj");
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saveAttrib(out, "v ", polygonizer.vertices);
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saveAttrib(out, "vn ", normals);
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saveFaces(out, polygonizer.indices, 2);
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}
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vector<glm::uvec4> edges;
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std::cout << "Vertices: " << polygonizer.vertices.size() << std::endl;
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std::cout << "Triangles: " << polygonizer.indices.size() << std::endl;
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texturemapper.map(polygonizer.vertices, normals, polygonizer.indices);
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moveToMean(texturemapper.vertices);
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{
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std::ofstream out("stage4.obj");
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saveAttrib(out, "v ", texturemapper.vertices);
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saveAttrib(out, "vn ", texturemapper.normals);
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saveAttrib(out, "vt ", texturemapper.texcoords);
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saveFaces(out, texturemapper.indices, 3);
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}
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}
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bool Application::bindVertexAttrib(GLuint id, GLint loc, GLuint size) {
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if (loc < 0)
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return false;
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GLCK(glBindBuffer(GL_ARRAY_BUFFER, id))
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GLCK(glEnableVertexAttribArray(loc))
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GLCK(glVertexAttribPointer(loc, // attribute
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size,// size
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GL_FLOAT,// type
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GL_FALSE,// normalized?
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0,// stride
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(void* ) 0// array buffer offset
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))
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return true;
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}
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void Application::updateVertexArrayObject() {
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GLCK(glBindVertexArray(vertexArrayId))
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if (vPositionLoc >= 0)
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GLCK(glDisableVertexAttribArray(vPositionLoc))
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if (vNormalLoc >= 0)
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GLCK(glDisableVertexAttribArray(vNormalLoc))
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if (vTexCoordLoc >= 0)
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GLCK(glDisableVertexAttribArray(vTexCoordLoc))
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bindVertexAttrib(vPositionId, vPositionLoc, 3);
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bindVertexAttrib(vNormalId, vNormalLoc, 3);
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bindVertexAttrib(vTexCoordId, vTexCoordLoc, 2);
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GLCK(glBindVertexArray(0))
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}
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GLuint Application::loadProgram(const std::string &name) {
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// Create the shaders
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GLuint VertexShaderID = glCreateShader(GL_VERTEX_SHADER);
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GLuint FragmentShaderID = glCreateShader(GL_FRAGMENT_SHADER);
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// Read the Vertex Shader code from the file
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std::string VertexShaderCode;
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std::string vertex_file_path = "shader/" + name + ".vertex.glsl";
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std::ifstream VertexShaderStream(vertex_file_path, std::ios::in);
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if (VertexShaderStream.is_open()) {
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std::string Line = "";
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while (getline(VertexShaderStream, Line))
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VertexShaderCode += "\n" + Line;
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VertexShaderStream.close();
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} else {
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std::cout << "Failed to open " << vertex_file_path << std::endl;
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return 0;
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}
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// Read the Fragment Shader code from the file
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std::string FragmentShaderCode;
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std::string fragment_file_path = "shader/" + name + ".fragment.glsl";
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std::ifstream FragmentShaderStream(fragment_file_path, std::ios::in);
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if (FragmentShaderStream.is_open()) {
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std::string Line = "";
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while (getline(FragmentShaderStream, Line))
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FragmentShaderCode += "\n" + Line;
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FragmentShaderStream.close();
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} else {
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std::cout << "Failed to open " << vertex_file_path << std::endl;
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return 0;
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}
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GLint Result = GL_FALSE;
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int InfoLogLength;
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// Compile Vertex Shader
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std::cout << "Compiling vertex shader : " << name << std::endl;
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char const * VertexSourcePointer = VertexShaderCode.c_str();
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glShaderSource(VertexShaderID, 1, &VertexSourcePointer, NULL);
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glCompileShader(VertexShaderID);
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// Check Vertex Shader
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glGetShaderiv(VertexShaderID, GL_COMPILE_STATUS, &Result);
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glGetShaderiv(VertexShaderID, GL_INFO_LOG_LENGTH, &InfoLogLength);
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if (InfoLogLength > 0) {
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vector<char> VertexShaderErrorMessage(InfoLogLength + 1);
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glGetShaderInfoLog(VertexShaderID, InfoLogLength, NULL,
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&VertexShaderErrorMessage[0]);
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printf("%s\n", &VertexShaderErrorMessage[0]);
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}
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// Compile Fragment Shader
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std::cout << "Compiling fragment shader : " << name << std::endl;
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char const * FragmentSourcePointer = FragmentShaderCode.c_str();
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glShaderSource(FragmentShaderID, 1, &FragmentSourcePointer, NULL);
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glCompileShader(FragmentShaderID);
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// Check Fragment Shader
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glGetShaderiv(FragmentShaderID, GL_COMPILE_STATUS, &Result);
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glGetShaderiv(FragmentShaderID, GL_INFO_LOG_LENGTH, &InfoLogLength);
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if (InfoLogLength > 0) {
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vector<char> FragmentShaderErrorMessage(InfoLogLength + 1);
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glGetShaderInfoLog(FragmentShaderID, InfoLogLength, NULL,
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&FragmentShaderErrorMessage[0]);
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printf("%s\n", &FragmentShaderErrorMessage[0]);
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}
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// Link the program
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std::cout << "Linking program : " << name << std::endl;
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GLuint ProgramID = glCreateProgram();
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glAttachShader(ProgramID, VertexShaderID);
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glAttachShader(ProgramID, FragmentShaderID);
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glLinkProgram(ProgramID);
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// Check the program
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glGetProgramiv(ProgramID, GL_LINK_STATUS, &Result);
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glGetProgramiv(ProgramID, GL_INFO_LOG_LENGTH, &InfoLogLength);
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if (InfoLogLength > 0) {
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vector<char> ProgramErrorMessage(InfoLogLength + 1);
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glGetProgramInfoLog(ProgramID, InfoLogLength, NULL,
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&ProgramErrorMessage[0]);
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printf("%s\n", &ProgramErrorMessage[0]);
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}
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glDetachShader(ProgramID, VertexShaderID);
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glDetachShader(ProgramID, FragmentShaderID);
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glDeleteShader(VertexShaderID);
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glDeleteShader(FragmentShaderID);
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return ProgramID;
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}
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void Application::loadShader() {
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if (programId >= 0)
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GLCK(glDeleteProgram(programId))
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programId = loadProgram("standard");
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GLCK(MVPloc = glGetUniformLocation(programId, "MVP"))
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GLCK(Mloc = glGetUniformLocation(programId, "M"))
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GLCK(Vloc = glGetUniformLocation(programId, "V"))
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GLCK(
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LightPosition_worldspaceloc = glGetUniformLocation(programId, "LightPosition_worldspace"))
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GLCK(vPositionLoc = glGetAttribLocation(programId, "vPosition"))
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GLCK(vTexCoordLoc = glGetAttribLocation(programId, "vTexCoord"))
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GLCK(vNormalLoc = glGetAttribLocation(programId, "vNormal"))
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GLCK(tAlbedoLoc = glGetAttribLocation(programId, "tAlbedo"))
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GLCK(tNormalLoc = glGetAttribLocation(programId, "tNormal"))
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GLCK(tRoughnessLoc = glGetAttribLocation(programId, "tRoughness"))
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GLCK(tMetalicLoc = glGetAttribLocation(programId, "tMetalic"))
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}
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void Application::uploadMesh() {
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GLCK(glBindVertexArray(vertexArrayId))
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GLCK(glBindBuffer(GL_ARRAY_BUFFER, vPositionId))
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GLCK(
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glBufferData(GL_ARRAY_BUFFER, texturemapper.vertices.size() * sizeof(vec3), texturemapper.vertices.data(), GL_STATIC_DRAW))
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GLCK(glBindBuffer(GL_ARRAY_BUFFER, vTexCoordId))
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GLCK(
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glBufferData(GL_ARRAY_BUFFER, texturemapper.texcoords.size() * sizeof(glm::vec2), texturemapper.texcoords.data(), GL_STATIC_DRAW))
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GLCK(glBindBuffer(GL_ARRAY_BUFFER, vNormalId))
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GLCK(
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glBufferData(GL_ARRAY_BUFFER, texturemapper.normals.size() * sizeof(vec3), texturemapper.normals.data(), GL_STATIC_DRAW))
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GLCK(glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, indexBufferId))
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GLCK(
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glBufferData(GL_ELEMENT_ARRAY_BUFFER, texturemapper.indices.size() * sizeof(uvec3), texturemapper.indices.data(), GL_STATIC_DRAW))
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GLCK(glBindVertexArray(0))
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glBindTexture(GL_TEXTURE_2D, tAlbedoId);
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glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, texturemapper.getTextureSize(),
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texturemapper.getTextureSize(), 0, GL_BGR, GL_UNSIGNED_BYTE,
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texturemapper.albedo.data());
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
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}
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void Application::renderMesh() {
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GLCK(glBindVertexArray(vertexArrayId))
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GLCK(
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glDrawElements(GL_TRIANGLES, texturemapper.indices.size() * 3, GL_UNSIGNED_INT, (void* ) 0))
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GLCK(glBindVertexArray(0))
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}
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void Application::prepareShader() {
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glm::mat4 model(1.0f);
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glm::mat4 view;
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if (fpsMode) {
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glm::vec4 movement(0.0);
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if (fpsMode) {
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if (glfwGetKey(window, GLFW_KEY_W) == GLFW_PRESS) {
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movement += glm::vec4(0.0, 0.0, 0.1, 0.0);
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} else if (glfwGetKey(window, GLFW_KEY_S) == GLFW_PRESS) {
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movement -= glm::vec4(0.0, 0.0, 0.1, 0.0);
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}
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}
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glm::vec3 absolute = glm::transpose(fpsTrafo) * movement;
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fpsTrafo = glm::translate(fpsTrafo, absolute);
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view = fpsTrafo;
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} else {
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model = glm::rotate(model, (float) glfwGetTime(), vec3(0.f, 1.f, 0.f));
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view = glm::lookAt(vec3(0, 0, viewDistance), // Camera is at (4,3,3), in World Space
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vec3(0, 0, 0), // and looks at the origin
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vec3(0, 1, 0) // Head is up (set to 0,-1,0 to look upside-down)
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);
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}
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glm::mat4 perspective = glm::perspective(glm::radians(45.0f),
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(float) width / (float) height, 0.1f, 100.0f);
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glm::mat4 mvp = perspective * view * model;
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GLCK(glUseProgram(programId))
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if (MVPloc >= 0) {
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GLCK(glUniformMatrix4fv(MVPloc, 1, GL_FALSE, glm::value_ptr(mvp)))
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}
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if (Mloc >= 0) {
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GLCK(glUniformMatrix4fv(Mloc, 1, GL_FALSE, glm::value_ptr(model)))
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}
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|
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", ¤tTextureSize, 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);
|
|
|
|
}
|
|
}
|