dsda: fix palette not changing

note on using PALETTE_SIZE as offset. normally it's `256 colors * 3 bytes per color = 768`, but in our headless mode it's 256. upstream does `SDL_SetPaletteColors(screen->format->palette, playpal_data->colours + 256 * pal, 0, 256);` when palette is updated, so clearly it means offsetting by 256 colors=bytes. but PALETTE_SIZE I used as my offset is not for stuff upstream uses it for. just something better than a magic number.

waterbox/dsda/.vscode/settings.json

@@ -1,14 +1,6 @@
 {
   "editor.tabSize": 2,
   "files.associations": {
-    "f_wipe.h": "c",
-    "bizhawkinterface.h": "c",
-    "emulibc.h": "c",
-    "d_main.h": "c",
-    "m_fixed.h": "c",
-    "d_event.h": "c",
-    "doomtype.h": "c",
-    "g_game.h": "c",
-    "d_player.h": "c"
+    "*.*": "c"
   }
 }

waterbox/dsda/BizhawkInterface.c

@@ -151,7 +151,7 @@ ECL_EXPORT void dsda_get_video(int *w, int *h, int *pitch, uint8_t **buffer, int
   *pitch = headlessGetVideoPitch();
   *paletteSize = PALETTE_SIZE;
 
-  uint32_t *palette = headlessGetPallette();
+  uint32_t *palette = headlessGetPallette() + PALETTE_SIZE * currentPaletteIndex;
   for (size_t i = 0; i < PALETTE_SIZE; i++)
   {
     uint8_t *srcColor = (uint8_t *)&palette[i];

waterbox/dsda/BizhawkInterface.h

@@ -37,6 +37,7 @@ extern int headlessGetVideoHeight();
 extern void headlessEnableVideoRendering();
 extern void headlessDisableVideoRendering();
 extern uint32_t* headlessGetPallette();
+extern int currentPaletteIndex;
 
 // Audio
 extern void headlessUpdateSounds();

waterbox/dsda/core

@@ -1 +1 @@
-Subproject commit 44fcb8a3cb7025ec54b80217ca6e6d71607ab914
+Subproject commit a7a3e7de03fd96e79ef340995cf12b04216f3382