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extract game logic to separate file

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PoliEcho 2025-08-23 19:26:20 +02:00
parent ef8d4c3ad2
commit 3f9d68252e
11 changed files with 5261 additions and 134 deletions
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4
.gitignore vendored
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@ -1,2 +1,4 @@
.vscode
build/
.cache/
build/
compile_commands.json

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assets/enemy_1.pdf Normal file
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misc/enemy_1.dxf Normal file
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5
src/const.hpp
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@ -7,3 +7,8 @@ constexpr int WORLD_WIDTH = 20000;
constexpr int WORLD_HEIGHT = 200000;
constexpr int TARGET_FPS = 120;
constexpr Uint64 TARGET_FRAME_TIME_NS = 1'000'000'000 / TARGET_FPS;
#define WIDTH_RATIO 15
#define HEIGHT_RATIO 41.53846153846154
#define MIN_INPUT_DELAY_MOVEMENT 0
#define MIN_INPUT_DELAY_FIRE 200

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src/game_logic.cpp Normal file
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@ -0,0 +1,136 @@
#include "const.hpp"
#include "main.hpp"
#include "projectiles.hpp"
#include "types.hpp"
#include <cstring>
#include <vector>
// returns true on win and false on lose
bool play_level() {
ship_type player_ship = []() -> ship_type {
SDL_Texture *player_ship_texture = nullptr;
SDL_IOStream *texture_file = SDL_IOFromFile("assets/player_ship.svg", "r");
float ship_width = static_cast<float>(static_cast<double>(mode->w) /
static_cast<double>(WIDTH_RATIO));
float ship_height = static_cast<float>(static_cast<double>(mode->h) /
static_cast<double>(HEIGHT_RATIO));
SDL_Surface *player_ship_surface =
IMG_LoadSizedSVG_IO(texture_file, ship_width, ship_height);
SDL_CloseIO(texture_file);
player_ship_texture = SDL_CreateTextureFromSurface(
main_sdl_session.renderer, player_ship_surface);
SDL_DestroySurface(player_ship_surface);
SDL_FRect player_ship_rect = {0, 0, ship_width, ship_height};
SDL_FPoint gun_offset = {ship_width * 0.9f, ship_height * 0.9f};
return {player_ship_rect, gun_offset, player_ship_texture};
}();
bool running = true;
Uint64 lastFrameTime = SDL_GetTicksNS();
float deltaTime = 0.0f;
Uint8 player_ship_speed = 1;
std::vector<projectile> projectiles;
std::vector<ship_type> enemies;
while (running) {
const Uint64 frameStart = SDL_GetTicksNS();
SDL_Event event;
while (SDL_PollEvent(&event)) {
switch (event.type) {
case SDL_EVENT_QUIT:
running = false;
break;
default:
break;
}
}
{
const bool *keystate = SDL_GetKeyboardState(NULL);
static Uint32 last_toggle_direction[4];
std::memset(last_toggle_direction, 0, sizeof(last_toggle_direction));
if ((keystate[SDL_SCANCODE_DOWN] || keystate[SDL_SCANCODE_S]) &&
(SDL_GetTicks() - last_toggle_direction[0] >
MIN_INPUT_DELAY_MOVEMENT)) {
if (player_ship.rect.y + player_ship.rect.h < mode->h) {
player_ship.rect.y += player_ship_speed;
}
last_toggle_direction[0] = SDL_GetTicks();
}
if ((keystate[SDL_SCANCODE_UP] || keystate[SDL_SCANCODE_W]) &&
(SDL_GetTicks() - last_toggle_direction[1] >
MIN_INPUT_DELAY_MOVEMENT)) {
if (player_ship.rect.y > 0) {
player_ship.rect.y -= player_ship_speed;
}
last_toggle_direction[1] = SDL_GetTicks();
}
if ((keystate[SDL_SCANCODE_RIGHT] || keystate[SDL_SCANCODE_D]) &&
(SDL_GetTicks() - last_toggle_direction[2] >
MIN_INPUT_DELAY_MOVEMENT)) {
if (player_ship.rect.x + player_ship.rect.w < mode->w) {
player_ship.rect.x += player_ship_speed;
}
last_toggle_direction[2] = SDL_GetTicks();
}
if ((keystate[SDL_SCANCODE_LEFT] || keystate[SDL_SCANCODE_A]) &&
(SDL_GetTicks() - last_toggle_direction[3] >
MIN_INPUT_DELAY_MOVEMENT)) {
if (player_ship.rect.x > 0) {
player_ship.rect.x -= player_ship_speed;
}
last_toggle_direction[3] = SDL_GetTicks();
}
const SDL_MouseButtonFlags mousestate =
SDL_GetMouseState(nullptr, nullptr);
static Uint32 last_fire = 0;
if ((mousestate & SDL_BUTTON_LMASK || keystate[SDL_SCANCODE_SPACE]) &&
SDL_GetTicks() - last_fire > MIN_INPUT_DELAY_FIRE) {
projectiles.push_back(
spawn_projectile({player_ship.rect.x + player_ship.gun_offset.x,
player_ship.rect.y + player_ship.gun_offset.y},
1, 0, 3, "assets/basic_projectile.svg", nullptr));
last_fire = SDL_GetTicks();
}
}
SDL_SetRenderDrawColor(main_sdl_session.renderer, 0, 0, 0, 255);
SDL_RenderClear(main_sdl_session.renderer);
for (projectile &p : projectiles) {
if (p.rect.x > mode->w || p.rect.y > mode->h) {
projectiles.erase(projectiles.begin() + (&p - projectiles.data()));
} else { // TODO colision detection
step_projectile(p);
}
}
SDL_RenderTexture(main_sdl_session.renderer, player_ship.texture, nullptr,
&player_ship.rect);
SDL_RenderPresent(main_sdl_session.renderer);
const Uint64 frameTime = SDL_GetTicksNS() - frameStart;
if (frameTime < TARGET_FRAME_TIME_NS) {
const Uint64 sleepTime = TARGET_FRAME_TIME_NS - frameTime;
if (sleepTime >= 2'000'000) {
SDL_DelayNS(sleepTime - 2'000'000);
}
while (SDL_GetTicksNS() - frameStart < TARGET_FRAME_TIME_NS) {
}
}
deltaTime = (SDL_GetTicksNS() - lastFrameTime) / 1e9f;
lastFrameTime = SDL_GetTicksNS();
}
SDL_DestroyTexture(player_ship.texture);
}

2
src/game_logic.hpp Normal file
View File

@ -0,0 +1,2 @@
#pragma once
bool play_level();

133
src/main.cpp
View File

@ -1,5 +1,4 @@
#include "const.hpp"
#include "projectiles.hpp"
#include "game_logic.hpp"
#include "types.hpp"
#include <SDL3/SDL.h>
#include <SDL3/SDL_events.h>
@ -12,23 +11,14 @@
#include <SDL3/SDL_timer.h>
#include <SDL3/SDL_video.h>
#include <SDL3_image/SDL_image.h>
#include <cstddef>
#include <cstring>
#include <vector>
sdl_session main_sdl_session;
SDL_DisplayMode *mode;
#define WIDTH_RATIO 15
#define HEIGHT_RATIO 41.53846153846154
#define MIN_INPUT_DELAY_MOVEMENT 0
#define MIN_INPUT_DELAY_FIRE 200
const SDL_DisplayMode *mode;
int main(int argc, char *argv[]) {
SDL_Init(SDL_INIT_VIDEO);
const SDL_DisplayMode *mode =
SDL_GetCurrentDisplayMode(SDL_GetPrimaryDisplay());
mode = SDL_GetCurrentDisplayMode(SDL_GetPrimaryDisplay());
main_sdl_session.window =
SDL_CreateWindow("Vector Blow", mode->w, mode->h, SDL_WINDOW_FULLSCREEN);
@ -36,123 +26,8 @@ int main(int argc, char *argv[]) {
main_sdl_session.renderer =
SDL_CreateRenderer(main_sdl_session.window, "gpu,vulcan");
player_ship_type player_ship = [&mode]() -> player_ship_type {
SDL_Texture *player_ship_texture = nullptr;
play_level();
SDL_IOStream *texture_file = SDL_IOFromFile("assets/player_ship.svg", "r");
float ship_width = static_cast<float>(static_cast<double>(mode->w) /
static_cast<double>(WIDTH_RATIO));
float ship_height = static_cast<float>(static_cast<double>(mode->h) /
static_cast<double>(HEIGHT_RATIO));
SDL_Surface *player_ship_surface =
IMG_LoadSizedSVG_IO(texture_file, ship_width, ship_height);
SDL_CloseIO(texture_file);
player_ship_texture = SDL_CreateTextureFromSurface(
main_sdl_session.renderer, player_ship_surface);
SDL_DestroySurface(player_ship_surface);
SDL_FRect player_ship_rect = {0, 0, ship_width, ship_height};
SDL_FPoint gun_offset = {ship_width * 0.9f, ship_height * 0.9f};
return {player_ship_rect, gun_offset, player_ship_texture};
}();
bool running = true;
Uint64 lastFrameTime = SDL_GetTicksNS();
float deltaTime = 0.0f;
Uint8 player_ship_speed = 1;
std::vector<projectile> projectiles;
while (running) {
const Uint64 frameStart = SDL_GetTicksNS();
SDL_Event event;
while (SDL_PollEvent(&event)) {
switch (event.type) {
case SDL_EVENT_QUIT:
running = false;
break;
default:
break;
}
}
{
const bool *keystate = SDL_GetKeyboardState(NULL);
static Uint32 last_toggle_direction[4];
std::memset(last_toggle_direction, 0, sizeof(last_toggle_direction));
if ((keystate[SDL_SCANCODE_DOWN] || keystate[SDL_SCANCODE_S]) &&
(SDL_GetTicks() - last_toggle_direction[0] >
MIN_INPUT_DELAY_MOVEMENT)) {
player_ship.rect.y += player_ship_speed;
last_toggle_direction[0] = SDL_GetTicks();
}
if ((keystate[SDL_SCANCODE_UP] || keystate[SDL_SCANCODE_W]) &&
(SDL_GetTicks() - last_toggle_direction[1] >
MIN_INPUT_DELAY_MOVEMENT)) {
player_ship.rect.y -= player_ship_speed;
last_toggle_direction[1] = SDL_GetTicks();
}
if ((keystate[SDL_SCANCODE_RIGHT] || keystate[SDL_SCANCODE_D]) &&
(SDL_GetTicks() - last_toggle_direction[2] >
MIN_INPUT_DELAY_MOVEMENT)) {
player_ship.rect.x += player_ship_speed;
last_toggle_direction[2] = SDL_GetTicks();
}
if ((keystate[SDL_SCANCODE_LEFT] || keystate[SDL_SCANCODE_A]) &&
(SDL_GetTicks() - last_toggle_direction[3] >
MIN_INPUT_DELAY_MOVEMENT)) {
player_ship.rect.x -= player_ship_speed;
last_toggle_direction[3] = SDL_GetTicks();
}
const SDL_MouseButtonFlags mousestate =
SDL_GetMouseState(nullptr, nullptr);
static Uint32 last_fire = 0;
if ((mousestate & SDL_BUTTON_LMASK || keystate[SDL_SCANCODE_SPACE]) &&
SDL_GetTicks() - last_fire > MIN_INPUT_DELAY_FIRE) {
projectiles.push_back(
spawn_projectile({player_ship.rect.x + player_ship.gun_offset.x,
player_ship.rect.y + player_ship.gun_offset.y},
1, 0, 3, "assets/basic_projectile.svg", nullptr));
last_fire = SDL_GetTicks();
}
}
SDL_SetRenderDrawColor(main_sdl_session.renderer, 0, 0, 0, 255);
SDL_RenderClear(main_sdl_session.renderer);
for (projectile &p : projectiles) {
if (p.rect.x > mode->w || p.rect.y > mode->h) {
projectiles.erase(projectiles.begin() + (&p - projectiles.data()));
} else { // TODO colision detection
step_projectile(p);
}
}
SDL_RenderTexture(main_sdl_session.renderer, player_ship.texture, nullptr,
&player_ship.rect);
SDL_RenderPresent(main_sdl_session.renderer);
const Uint64 frameTime = SDL_GetTicksNS() - frameStart;
if (frameTime < TARGET_FRAME_TIME_NS) {
const Uint64 sleepTime = TARGET_FRAME_TIME_NS - frameTime;
if (sleepTime >= 2'000'000) {
SDL_DelayNS(sleepTime - 2'000'000);
}
while (SDL_GetTicksNS() - frameStart < TARGET_FRAME_TIME_NS) {
}
}
deltaTime = (SDL_GetTicksNS() - lastFrameTime) / 1e9f;
lastFrameTime = SDL_GetTicksNS();
}
SDL_DestroyTexture(player_ship.texture);
SDL_DestroyRenderer(main_sdl_session.renderer);
SDL_DestroyWindow(main_sdl_session.window);
SDL_Quit();

3
src/main.hpp
View File

@ -1,3 +1,4 @@
#pragma once
#include "types.hpp"
extern sdl_session main_sdl_session;
extern sdl_session main_sdl_session;
extern SDL_DisplayMode *mode;

2
src/meth.cpp
View File

@ -1,5 +1,3 @@
#pragma once
#include "types.hpp"
#include <cmath>

17
src/types.hpp
View File

@ -5,6 +5,14 @@
#include <cmath>
#include <iostream>
enum enemy_ai_type {
RANDOM,
FLYER,
GUNNER,
ACE,
BOSS,
};
struct Angle {
private:
float value{0};
@ -105,12 +113,19 @@ struct sdl_session {
SDL_Renderer *renderer;
};
struct player_ship_type {
struct ship_type {
SDL_FRect rect;
SDL_FPoint gun_offset;
SDL_Texture *texture;
};
struct enemy_type {
ship_type ship;
enemy_ai_type type;
Uint32 last_shot;
Uint32 reload_time;
};
struct projectile {
SDL_FRect rect;
SDL_Texture *texture;