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fix buffer overflow in chargen + CRT effect

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Ondřej Novák 2025-01-30 10:46:58 +01:00
parent f169aa5071
commit ebcd71ece8
5 changed files with 48 additions and 5 deletions
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44
platform/sdl/sdl_context.cpp
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@ -48,6 +48,35 @@ SDLContext::SDLContext() {
}
void SDLContext::generateCRTTexture(SDL_Renderer* renderer, SDL_Texture** texture, int width, int height) {
// Vytvoř novou texturu ve správné velikosti
*texture = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_RGBA8888, SDL_TEXTUREACCESS_STREAMING, width, height);
SDL_SetTextureBlendMode(*texture, SDL_BLENDMODE_BLEND);
// Zamkni texturu pro přímý přístup k pixelům
void* pixels;
int pitch;
SDL_LockTexture(*texture, nullptr, &pixels, &pitch);
// Vyplň texturu patternem (liché řádky tmavší)
Uint32* pixelArray = (Uint32*)pixels;
Uint32 darkPixel = 0x00000080; // Černá s částečnou průhledností
Uint32 transparentPixel = 0x00000000;
for (int y = 0; y < height; y++) {
Uint32 color = (y % 3 == 0) ? darkPixel : transparentPixel;
for (int x = 0; x < width; x++) {
pixelArray[y * (pitch / 4) + x] = color;
}
}
// Odemkni texturu
SDL_UnlockTexture(*texture);
}
void SDLContext::init_screen(DisplayMode mode, const char *title) {
char buff[256];
static Uint32 update_request_event = SDL_RegisterEvents(1);
@ -78,6 +107,7 @@ void SDLContext::init_screen(DisplayMode mode, const char *title) {
snprintf(buff, sizeof(buff), "SDL Error create window: %s\n", SDL_GetError());
throw std::runtime_error(buff);
}
SDL_SetHint(SDL_HINT_RENDER_SCALE_QUALITY, "2");
_window.reset(window);
SDL_Renderer *renderer = SDL_CreateRenderer(_window.get(), -1, 0);
@ -151,7 +181,11 @@ void SDLContext::event_loop(std::stop_token stp) {
update_screen();
}
if (e.type == SDL_KEYDOWN) {
if (e.type == SDL_WINDOWEVENT) {
if (e.window.event == SDL_WINDOWEVENT_SIZE_CHANGED) {
_crt_effect.reset();
}
} else if (e.type == SDL_KEYDOWN) {
_key_capslock = e.key.keysym.mod & KMOD_CAPS;
_key_shift =e.key.keysym.mod & KMOD_SHIFT;
_key_control =e.key.keysym.mod & KMOD_CTRL;
@ -320,6 +354,14 @@ void SDLContext::update_screen() {
SDL_SetTextureAlphaMod(_visible_texture, 255);
SDL_RenderCopy(_renderer.get(), _visible_texture, NULL, &winrc);
}
if (winrc.w > 1280 && winrc.h > 960) {
if (!_crt_effect) {
SDL_Texture *txt;
generateCRTTexture(_renderer.get(), &txt, 128, std::min<int>(1440, winrc.h));
_crt_effect.reset(txt);
}
}
SDL_RenderCopy(_renderer.get(), _crt_effect.get(), NULL, &winrc);
SDL_RenderPresent(_renderer.get());
}

3
platform/sdl/sdl_context.h
View file

@ -94,6 +94,7 @@ protected:
std::unique_ptr<SDL_Renderer, SDL_Deleter> _renderer;
std::unique_ptr<SDL_Texture, SDL_Deleter> _texture;
std::unique_ptr<SDL_Texture, SDL_Deleter> _texture2;
std::unique_ptr<SDL_Texture, SDL_Deleter> _crt_effect;
SDL_Texture *_visible_texture;
SDL_Texture *_hidden_texture;
@ -136,7 +137,7 @@ protected:
static SDL_Point to_source_point(const SDL_Rect &win_rec, const SDL_Point &win_pt) ;
static SDL_Rect transition_rect(const SDL_Rect &beg, const SDL_Rect &end, float phase);
static int transition_int(int beg, int end, float phase);
void generateCRTTexture(SDL_Renderer* renderer, SDL_Texture** texture, int width, int height);
void signal_push();