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#include <iostream>
#include <GL/glew.h>
#include <GLFW/glfw3.h>
#include "GFX/Window.hpp"
#include "GFX/Camera.hpp"
#include "GFX/Binder.hpp"
#include "Math/MVP.hpp"
#include "GFX/Shading/Program.hpp"
#include "GFX/Texture.hpp"
#include "GFX/Image/PPMParser.hpp"
#include "World/World.hpp"
#include "Util/ImageViewer.hpp"
#define APP_NAME "Meowcraft"
#define WINDOW_WIDTH 1000
#define WINDOW_HEIGHT 800
#define ASPECT static_cast<float>(WINDOW_WIDTH) / WINDOW_HEIGHT
#define FOV 90
void run();
void render(MC::GFX::BindableMesh&, MC::GFX::Texture&);
void process_input(MC::GFX::Window&, MC::GFX::Camera&);
void setup_gl();
void fix_macos_render(MC::GFX::Window&);
int main() {
glfwInit();
try {
run();
} catch (std::runtime_error& error) {
std::cout << "An error occurred: " << error.what() << std::endl;
glfwTerminate();
return 1;
}
glfwTerminate();
return 0;
}
void run() {
MC::GFX::Window window(APP_NAME, WINDOW_WIDTH, WINDOW_HEIGHT);
setup_gl();
glViewport(0, 0, WINDOW_WIDTH, WINDOW_HEIGHT);
window.on_size_change([](GLFWwindow* window, int w, int h) {
glViewport(0, 0, w, h);
});
auto example_image = MC::GFX::Image::RawImage(10, 10, 3);
for (uint8_t x = 0; x < 10; x++) {
for (uint8_t y = 0; y < 10; y++) {
example_image.add({static_cast<uint8_t>(x * 20), 0, static_cast<uint8_t>(y * 20)});
}
}
auto viewer = MC::Util::ImageViewer(example_image);
auto image = MC::GFX::Image::PPMParser(MC::Assets::Images::atlas).parse();
auto texture = MC::GFX::Texture(image);
MC::World::World world;
MC::GFX::Camera camera{};
camera.set_position({0.0f, 50.0f, 0.0f});
MC::GFX::Shading::Program program(
MC::GFX::Shading::Shader::create_vertex(),
MC::GFX::Shading::Shader::create_fragment()
);
auto model_uniform = program.uniform("model_matrix");
auto view_uniform = program.uniform("view_matrix");
auto projection_uniform = program.uniform("projection_matrix");
auto sun_direction_uniform = program.uniform("sun_direction");
program.bind();
auto projection = Math::MVP::perspective_projection(ASPECT, FOV, 0.1f, 1000.0f);
projection_uniform.set(projection);
Vector<3> sun_direction{1.0f, -1.0f, 0.0f};
sun_direction_uniform.set(sun_direction);
glEnable(GL_DEPTH_TEST);
glDepthFunc(GL_LEQUAL);
glEnable(GL_CULL_FACE);
glCullFace(GL_BACK);
uint64_t time = 0;
while (!window.should_close()) {
window.start_frame();
#ifdef __APPLE__
fix_macos_render(window);
#endif
process_input(window, camera);
program.bind();
auto view = Math::MVP::view(camera.position(), camera.angles());
view_uniform.set(view);
glClearColor(0.85f, 0.85f, 0.85f, 1.0f); // #DBDBDB
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
for (auto& chunk : world.get_visible_chunks(camera.position())) {
auto model = Math::MVP::model(chunk.chunk->position(), {});
model_uniform.set(model);
render(chunk.mesh.value(), texture);
}
viewer.render();
time++;
}
}
void render(MC::GFX::BindableMesh& mesh, MC::GFX::Texture& texture) {
texture.bind();
mesh.bind();
glDrawElements(GL_TRIANGLES, mesh.size(), GL_UNSIGNED_INT, nullptr);
mesh.unbind();
texture.unbind();
}
void process_input(MC::GFX::Window& window, MC::GFX::Camera& camera) {
if (window.key(GLFW_KEY_ESCAPE, GLFW_PRESS)) {
window.close();
}
auto r = window.mouse_delta();
auto key = [&](int key) -> float { return window.key(key, GLFW_PRESS); };
float x = key(GLFW_KEY_D) - key(GLFW_KEY_A);
float y = key(GLFW_KEY_SPACE) - key(GLFW_KEY_LEFT_SHIFT);
float z = key(GLFW_KEY_S) - key(GLFW_KEY_W);
auto move_speed = 0.2f;
auto rotation_speed = 0.1f;
camera.move_relative({x * move_speed, y * move_speed, z * move_speed});
camera.rotate({r.y() * rotation_speed, r.x() * rotation_speed, 0.0f});
}
void setup_gl() {
GLenum error;
if ((error = glewInit()) != GLEW_OK) {
std::string error_string(reinterpret_cast<const char*>(glewGetErrorString(error)));
throw std::runtime_error("Failed to load GL functions: " + error_string);
}
}
void fix_macos_render(MC::GFX::Window& window) {
static bool moved = false;
if(!moved) {
int x, y;
glfwGetWindowPos(window.get(), &x, &y);
glfwSetWindowPos(window.get(), ++x, y);
moved = true;
}
}
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