add fps util for pxl8 in lua

src/lua/pxl8.lua

@@ -1,5 +1,6 @@
 local ffi = require("ffi")
 local C = ffi.C
+local game = _pxl8_game
 local gfx = _pxl8_gfx
 local input = _pxl8_input
 local ui = _pxl8_ui
@@ -46,6 +47,10 @@ function pxl8.sprite(id, x, y, w, h, flip_x, flip_y)
     C.pxl8_sprite(gfx, id or 0, x or 0, y or 0, w or 16, h or 16, flip_x or false, flip_y or false)
 end
 
+function pxl8.get_fps()
+    return C.pxl8_game_get_fps(game)
+end
+
 function pxl8.get_width()
     return C.pxl8_gfx_get_width(gfx)
 end

src/pxl8.c

@@ -119,6 +119,7 @@ pxl8_game_result pxl8_init(pxl8_game* game, i32 argc, char* argv[]) {
     pxl8_script_set_gfx(game->script, game->gfx);
     pxl8_script_set_input(game->script, &game->input);
     pxl8_script_set_ui(game->script, game->ui);
+    pxl8_script_set_game(game->script, game);
 
     if (game->script_path[0] != '\0') {
         pxl8_result result = pxl8_script_load_main(game->script, game->script_path);
@@ -307,3 +308,7 @@ void pxl8_quit(pxl8_game* game) {
     pxl8_script_destroy(game->script);
     if (game->ui) pxl8_ui_destroy(game->ui);
 }
+
+f32 pxl8_game_get_fps(const pxl8_game* game) {
+    return game ? game->fps : 0.0f;
+}

src/pxl8_game.h

@@ -52,3 +52,4 @@ pxl8_game_result pxl8_init(pxl8_game* game, i32 argc, char* argv[]);
 pxl8_game_result pxl8_update(pxl8_game* game);
 pxl8_game_result pxl8_frame(pxl8_game* game);
 void pxl8_quit(pxl8_game* game);
+f32 pxl8_game_get_fps(const pxl8_game* game);

src/pxl8_script.c

@@ -79,9 +79,12 @@ static const char* pxl8_ffi_cdefs =
 "typedef float    f32;\n"
 "typedef double   f64;\n"
 "typedef struct pxl8_gfx pxl8_gfx;\n"
+"typedef struct pxl8_game pxl8_game;\n"
 "typedef struct { int x, y, w, h; } pxl8_bounds;\n"
 "typedef struct { int x, y; } pxl8_point;\n"
 "\n"
+"f32 pxl8_game_get_fps(const pxl8_game* game);\n"
+"\n"
 "i32 pxl8_gfx_get_height(pxl8_gfx* ctx);\n"
 "i32 pxl8_gfx_get_width(pxl8_gfx* ctx);\n"
 "void pxl8_circle(pxl8_gfx* ctx, i32 x, i32 y, i32 r, u32 color);\n"
@@ -408,6 +411,14 @@ void pxl8_script_set_ui(pxl8_script* script, pxl8_ui* ui) {
     }
 }
 
+void pxl8_script_set_game(pxl8_script* script, void* game) {
+    if (!script) return;
+    if (script->L && game) {
+        lua_pushlightuserdata(script->L, game);
+        lua_setglobal(script->L, "_pxl8_game");
+    }
+}
+
 static pxl8_result pxl8_script_prepare_path(pxl8_script* script, const char* filename, char* out_basename, size_t basename_size) {
     char filename_copy[PATH_MAX];
     strncpy(filename_copy, filename, sizeof(filename_copy) - 1);

src/pxl8_script.h

@@ -20,6 +20,7 @@ void pxl8_script_set_cart_path(pxl8_script* script, const char* cart_path, const
 void pxl8_script_set_gfx(pxl8_script* script, pxl8_gfx* gfx);
 void pxl8_script_set_input(pxl8_script* script, pxl8_input_state* input);
 void pxl8_script_set_ui(pxl8_script* script, pxl8_ui* ui);
+void pxl8_script_set_game(pxl8_script* script, void* game);
 
 pxl8_result pxl8_script_call_function(pxl8_script* script, const char* name);
 pxl8_result pxl8_script_call_function_f32(pxl8_script* script, const char* name, f32 arg);

src/pxl8_sdl3.c

@@ -61,9 +61,6 @@ static void* sdl3_create(pxl8_color_mode mode, pxl8_resolution resolution,
         pxl8_error("Failed to set vsync: %s", SDL_GetError());
     }
 
-    SDL_SetRenderLogicalPresentation(ctx->renderer, fb_w, fb_h,
-                                     SDL_LOGICAL_PRESENTATION_INTEGER_SCALE);
-
     ctx->framebuffer_texture = SDL_CreateTexture(ctx->renderer,
                                                   SDL_PIXELFORMAT_RGBA32,
                                                   SDL_TEXTUREACCESS_STREAMING,