shithub: zelda3

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Proper fullscreen aspect ratio. Fixes #28

Co-authored-by: André Köhler <andrekoehler@users.noreply.github.com>

--- a/main.c

+++ b/main.c

@@ -36,13 +36,13 @@

 static uint8 *ReadFile(char* name, size_t* length);

 static bool LoadRom(char* name, Snes* snes);

 static void PlayAudio(Snes *snes, SDL_AudioDeviceID device, int16 *audioBuffer);

-static void RenderScreen(SDL_Renderer *renderer, SDL_Texture *texture);

+static void RenderScreen(SDL_Window *window, SDL_Renderer *renderer, SDL_Texture *texture, bool fullscreen);

 static void HandleInput(int keyCode, int modCode, bool pressed);

 static void HandleGamepadInput(int button, bool pressed);

 static void HandleGamepadAxisInput(int gamepad_id, int axis, int value);

 static void OpenOneGamepad(int i);

-int input1_current_state;

+static int input1_current_state;

 void NORETURN Die(const char *error) {

   fprintf(stderr, "Error: %s\n", error);

@@ -211,7 +211,7 @@

     ZeldaDrawPpuFrame();

     PlayAudio(snes_run, device, audioBuffer);

-    RenderScreen(renderer, texture);

+    RenderScreen(window, renderer, texture, (win_flags & SDL_WINDOW_FULLSCREEN_DESKTOP) != 0);

     SDL_RenderPresent(renderer); // vsyncs to 60 FPS

     // if vsync isn't working, delay manually

@@ -263,7 +263,7 @@

   }

 }

-static void RenderScreen(SDL_Renderer* renderer, SDL_Texture* texture) {

+static void RenderScreen(SDL_Window *window, SDL_Renderer *renderer, SDL_Texture *texture, bool fullscreen) {

   void* pixels = NULL;

   int pitch = 0;

   if(SDL_LockTexture(texture, NULL, &pixels, &pitch) != 0) {

@@ -273,7 +273,19 @@

   ppu_putPixels(GetPpuForRendering(), (uint8_t*) pixels);

   SDL_UnlockTexture(texture);

-  SDL_RenderCopy(renderer, texture, NULL, NULL);

+

+  SDL_DisplayMode display_mode;

+  if (fullscreen && SDL_GetWindowDisplayMode(window, &display_mode) == 0) {

+    uint32 w = display_mode.w, h = display_mode.h;

+    if (w * 15 < h * 16)

+      h = w * 15 / 16;  // limit height

+    else

+      w = h * 16 / 15;  // limit width

+    SDL_Rect r = { (display_mode.w - w) / 2, (display_mode.h - h) / 2, w, h };

+    SDL_RenderCopy(renderer, texture, NULL, &r);

+  } else {

+    SDL_RenderCopy(renderer, texture, NULL, NULL);

+  }

 }