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#include "engine.h"
#include "block.h"
#include "camera.h"
#include "cglm/io.h"
#include "chunk.h"
#include "input.h"
#include "window.h"
#include "world.h"
#include <junk/vector.h>
#include <string.h>
#include <time.h>
void _engine_insert_chunk_ptrs(struct engine* engine, struct chunk* chunk);
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;
// 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;
// Final step - Start the game
engine->game_loop = 1;
return 0;
}
void engine_update(struct engine* engine) {
int curr_chunk[2] = { (engine->camera->position[0] / CHUNK_WIDTH), (engine->camera->position[2]) / CHUNK_LENGTH };
// Chunk update
struct chunk* c = {0};
int coord[2] = { curr_chunk[0], curr_chunk[1] };
world_get_chunk(engine->world, coord, &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);
// Get "real" coords as in non-negative numbers, that can go in a array
int real_coord[2] = { i + CHUNK_DISTANCE, j + CHUNK_DISTANCE };
// engine->loaded_chunks[real_coord[0]][real_coord[1]] = chunk;
// Load chunk
chunk_unload(chunk);
}
}
// Update the curr_chunk
memcpy(engine->curr_chunk, curr_chunk, sizeof(vec2));
// Load chunks of CHUNK_DISTANCE around curr_chunk
}
}
void engine_start(struct engine* engine) {
while (engine->game_loop) {
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glClearColor(0.529f, 0.808f, 0.922f, 1.0f);
glEnable(GL_DEPTH_TEST);
//glPolygonMode(GL_FRONT_AND_BACK,GL_LINE);
glUseProgram(engine->shader->program);
// Update engine managed objects
engine_update(engine);//(1 + CHUNK_DISTANCE * 2) * (1 + CHUNK_DISTANCE * 2)
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};
// // Load chunk
// Ensure the y coordinate is negative, because in OpenGL +z-axis (y in chunk system) is towards
// user, so we want inwards to be positive, so flip sign
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(chunk, chunk_coord);
chunk_draw(chunk, engine->shader);
}
}
SDL_RenderPresent(engine->window->renderer);
}
}
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