From ab09e5f2cc148b7cf9eb81d050f45e3f80904b9b Mon Sep 17 00:00:00 2001
From: Xavier Del Campo Romero <xavi.dcr@tutanota.com>
Date: Thu, 24 Feb 2022 21:14:23 +0100
Subject: sdl-1.2: implement env.c

---
 src/gfx/sdl-1.2/src/env.c | 89 +++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 82 insertions(+), 7 deletions(-)

(limited to 'src')

diff --git a/src/gfx/sdl-1.2/src/env.c b/src/gfx/sdl-1.2/src/env.c
index d6d1f33..d77503d 100644
--- a/src/gfx/sdl-1.2/src/env.c
+++ b/src/gfx/sdl-1.2/src/env.c
@@ -2,23 +2,46 @@
 #include <gfx_private.h>
 #include <sdl-1.2/gfx_private.h>
 #include <SDL/SDL.h>
+#include <inttypes.h>
 #include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
 
 int screen_w = SCREEN_W, screen_h = SCREEN_H;
 static bool fullscreen;
 static SDL_Surface *screen;
+static struct sprite **list;
+static size_t list_len;
 
 void gfx_deinit(void)
 {
-    if (screen)
-        SDL_FreeSurface(screen);
-
+    /* screen should be already freed by SDL_Quit. */
+    free(list);
     SDL_QuitSubSystem(SDL_INIT_VIDEO);
 }
 
-static int resize_screen(const int w, const int h, const bool full_screen)
+static struct
 {
-    Uint32 flags = SDL_HWSURFACE | SDL_RESIZABLE | SDL_DOUBLEBUF;
+    int w, h;
+} display;
+
+void gfx_register_sprite(struct sprite *const s)
+{
+    /* realloc(3) could had been used directly, but Win9x relies on
+     * a C89/C90 library implementation, where calling realloc(3)
+     * with a NULL pointer is undefined behaviour.  */
+    if (!list)
+        list = malloc(sizeof *list);
+    else
+        list = realloc(list, (list_len + 1) * sizeof *list);
+
+    if (list)
+        list[list_len++] = s;
+}
+
+static int resize_screen(int w, int h, const bool full_screen)
+{
+    Uint32 flags = SDL_HWSURFACE | SDL_RESIZABLE | SDL_ANYFORMAT | SDL_DOUBLEBUF;
 
     const SDL_VideoInfo *const info = SDL_GetVideoInfo();
 
@@ -101,7 +124,59 @@ bool gfx_inside_drawenv(const short x, const short y, const short w,
 		&& y < screen_h;
 }
 
-SDL_Surface *gfx_port_screen(void)
+static int get_resize_events(void)
 {
-    return screen;
+    int n;
+    SDL_Event ev;
+
+    while ((n = SDL_PeepEvents(&ev, 1, SDL_GETEVENT,
+                SDL_VIDEORESIZEMASK)) > 0)
+    {
+        if (ev.type == SDL_VIDEORESIZE)
+        {
+            const SDL_ResizeEvent *const res = &ev.resize;
+
+            if (resize_screen(res->w, res->h, false))
+                return -1;
+        }
+    }
+
+    if (n < 0)
+    {
+        fprintf(stderr, "%s: SDL_PeepEvents: %s\n",
+            __func__, SDL_GetError());
+        return -1;
+    }
+
+    return 0;
+}
+
+int gfx_toggle_fullscreen(void)
+{
+    fullscreen ^= true;
+
+    const int w = fullscreen ? display.w : screen_w;
+    const int h = fullscreen ? display.h : screen_h;
+
+    if ((resize_screen(w, h, fullscreen)))
+        return -1;
+
+    return 0;
+}
+
+void gfx_draw(void)
+{
+    enum {FPS = 50, REFRESH_MS = 1000 / FPS};
+    static Uint32 prev;
+    const Uint32 cur = SDL_GetTicks();
+
+    if (cur - prev < REFRESH_MS)
+        SDL_Delay(REFRESH_MS - (cur - prev));
+
+    prev = SDL_GetTicks();
+
+    if (SDL_Flip(screen))
+        fprintf(stderr, "SDL_Flip: %s\n", SDL_GetError());
+
+    get_resize_events();
 }
-- 
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