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#include "engine.h"
#include "block.h"
#include "camera.h"
#include "cglm/io.h"
#include "chunk.h"
#include "input.h"
#include "texture.h"
#include "window.h"
#include "world.h"
#include <SDL2/SDL_render.h>
#include <bits/types/timer_t.h>
#include <junk/vector.h>
#include <math.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
int engine_init(struct engine *engine) {
// Setup the Window
struct window* window = malloc(sizeof(struct window));
memset(window, 0, sizeof(struct window));
if (window_init(window) != 0) {
free(window);
return -1;
}
engine->window = window;
// Setup Shader pipeline
struct shader* shader = malloc(sizeof(struct shader));
memset(shader, 0, sizeof(struct shader));
if (shader_init(shader)) {
free(window);
free(shader);
return -1;
};
engine->shader = shader;
// Load Textures
struct texture* texture = { 0 };
texture_init(&engine->texture);
texture_load(engine->texture, "textures/grass.jpg");
// Setup Objects to draw
// memset(engine->loaded_chunks, 0, (1 + CHUNK_DISTANCE * 2) * (1 + CHUNK_DISTANCE * 2));
// Setup camera
camera_init(&engine->camera);
vec3 camera_pos = { 0.0f, 15.0f, 0.0f };
camera_set_position(engine->camera, camera_pos);
// Setup root chunk
struct world* world;
world_init(time(NULL), &world);
engine->world = world;
//TODO: Move this loop to a function and flip chunk_coord sign correctly ONCE
for (int i = -CHUNK_DISTANCE; i <= CHUNK_DISTANCE; i++) {
for (int j = -CHUNK_DISTANCE; j <= CHUNK_DISTANCE; j++) {
struct chunk* chunk;
int chunk_coord[2] = { engine->curr_chunk[0] + i, engine->curr_chunk[1] + j };
world_get_chunk(engine->world, chunk_coord, &chunk);
// Load chunk
chunk_load(world, chunk, chunk_coord);
}
}
// Final step - Start the game
engine->game_loop = 1;
return 0;
}
void engine_update(struct engine* engine) {
//NOTE: OpenGL FLIP
int curr_chunk[2] = { floorf(engine->camera->position[0] / (float)CHUNK_WIDTH), floorf(-engine->camera->position[2] / (float)CHUNK_LENGTH) };
// Chunk update
struct chunk* c = {0};
world_get_chunk(engine->world, curr_chunk, &c);
// We moved a chunk - load new chunks with chunk_load
if (engine->curr_chunk[0] != curr_chunk[0] || engine->curr_chunk[1] != curr_chunk[1]) {
fprintf(stderr, "CHUNK Update! From (%d, %d) to (%d, %d)\n",
engine->curr_chunk[0],
engine->curr_chunk[1],
curr_chunk[0],
curr_chunk[1]);
// Unload existing chunks
for (int i = -CHUNK_DISTANCE; i <= CHUNK_DISTANCE; i++) {
for (int j = -CHUNK_DISTANCE; j <= CHUNK_DISTANCE; j++) {
struct chunk* chunk;
int chunk_coord[2] = { engine->curr_chunk[0] + i, engine->curr_chunk[1] + j };
world_get_chunk(engine->world, chunk_coord, &chunk);
// unload chunk
// TODO: Fix some VAO/VBO bug when negative y
chunk_unload(chunk);
}
}
// Update the curr_chunk
memcpy(engine->curr_chunk, curr_chunk, sizeof(vec2));
// Load chunks of CHUNK_DISTANCE around curr_chunk
for (int i = -CHUNK_DISTANCE; i <= CHUNK_DISTANCE; i++) {
for (int j = -CHUNK_DISTANCE; j <= CHUNK_DISTANCE; j++) {
struct chunk* chunk;
int chunk_coord[2] = { engine->curr_chunk[0] + i, engine->curr_chunk[1] + j };
world_get_chunk(engine->world, chunk_coord, &chunk);
// Load chunk
chunk_load(engine->world, chunk, chunk_coord);
}
}
}
}
void engine_fps(struct engine* engine, float fps) {
// TTF_Font* font = TTF_OpenFont("fonts/PixelifySans-Regular.ttf", 8.0f);
// SDL_RenderClear(engine->window->renderer);
// SDL_Color black = {0, 0, 0};
// char fps_text[36];
// snprintf(fps_text, 36, "FPS: %.2f", fps);
// SDL_Surface* text = TTF_RenderText_Solid(font, fps_text, black);
// SDL_Texture* texture = SDL_CreateTextureFromSurface(engine->window->renderer, text);
// SDL_RenderCopy(engine->window->renderer, texture, NULL, &rect);
}
void engine_start(struct engine* engine) {
float frames = 0;
time_t frame_last_time = time(NULL);
float fps = 0.0f;
while (engine->game_loop) {
time_t now = time(NULL);
time_t diff = now - frame_last_time;
// Calculate FPS every second
if (diff >= 1.0f) {
fps = frames / diff;
frames = 0;
frame_last_time = now;
fprintf(stderr, "FPS: %.2f\n", fps);
glm_vec3_print(engine->camera->position, stderr);
fprintf(stderr, "x: %d, y: %d\n", engine->curr_chunk[0], engine->curr_chunk[1]);
}
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glClearColor(0.529f, 0.808f, 0.922f, 1.0f);
glEnable(GL_DEPTH_TEST);
glEnable(GL_CULL_FACE);
glCullFace(GL_BACK);
glFrontFace(GL_CCW);
//glPolygonMode(GL_FRONT_AND_BACK,GL_LINE);
glUseProgram(engine->shader->program);
// Update engine managed objects
engine_fps(engine, fps);
engine_update(engine);
camera_update(engine->camera, engine->shader);
for (int i = -CHUNK_DISTANCE; i <= CHUNK_DISTANCE; i++) {
for (int j = -CHUNK_DISTANCE; j <= CHUNK_DISTANCE; j++) {
struct chunk* chunk = {0};
int chunk_coord[2] = { engine->curr_chunk[0] + i, engine->curr_chunk[1] + j };
world_get_chunk(engine->world, chunk_coord, &chunk);
chunk_draw(chunk, engine->shader, engine->texture);
}
}
SDL_RenderPresent(engine->window->renderer);
frames += 1;
}
}
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