From 394768f5acf66ad76e62106534ac9870c3b31ec7 Mon Sep 17 00:00:00 2001
From: OBattler <oubattler@gmail.com>
Date: Wed, 29 Dec 2021 20:53:32 +0100
Subject: [PATCH] In default mode, the SDL2 renderers now use UpdateTexture().

---
 src/include/86box/plat.h |  1 +
 src/win/win.c            |  8 ++++++++
 src/win/win_sdl.c        | 40 +++++++++++++++++++++++++++++++++++++++-
 src/win/win_ui.c         |  2 ++
 4 files changed, 50 insertions(+), 1 deletion(-)

diff --git a/src/include/86box/plat.h b/src/include/86box/plat.h
index 78795d757..3a605fe6b 100644
--- a/src/include/86box/plat.h
+++ b/src/include/86box/plat.h
@@ -126,6 +126,7 @@ extern void	plat_vidsize(int x, int y);
 extern void	plat_setfullscreen(int on);
 extern void	plat_resize(int x, int y);
 extern void	plat_vidapi_enable(int enabled);
+extern void	plat_vidapi_reload(void);
 extern void	plat_vid_reload_options(void);
 extern uint32_t plat_language_code(char* langcode);
 extern void plat_language_code_r(uint32_t lcid, char* outbuf, int len);
diff --git a/src/win/win.c b/src/win/win.c
index 7f35f6d0b..27386b5b7 100644
--- a/src/win/win.c
+++ b/src/win/win.c
@@ -1194,6 +1194,14 @@ plat_vid_reload_options(void)
 	vid_apis[vid_api].reload();
 }
 
+
+void
+plat_vidapi_reload(void)
+{
+    vid_apis[vid_api].reload();
+}
+
+
 /* Sets up the program language before initialization. */
 uint32_t 
 plat_language_code(char* langcode)
diff --git a/src/win/win_sdl.c b/src/win/win_sdl.c
index 3a898f43c..11315c3b5 100644
--- a/src/win/win_sdl.c
+++ b/src/win/win_sdl.c
@@ -230,6 +230,42 @@ sdl_stretch(int *w, int *h, int *x, int *y)
 
 static void
 sdl_blit(int x, int y, int w, int h)
+{
+    SDL_Rect r_src;
+    int ret;
+
+    if (!sdl_enabled || (x < 0) || (y < 0) || (w <= 0) || (h <= 0) || (w > 2048) || (h > 2048) || (buffer32 == NULL) || (sdl_render == NULL) || (sdl_tex == NULL)) {
+	video_blit_complete();
+	return;
+    }
+
+    SDL_LockMutex(sdl_mutex);
+
+    r_src.x = x;
+    r_src.y = y;
+    r_src.w = w;
+    r_src.h = h;
+    SDL_UpdateTexture(sdl_tex, &r_src, &(buffer32->line[y][x]), 2048 * sizeof(uint32_t));
+    video_blit_complete();
+
+    SDL_RenderClear(sdl_render);
+
+    r_src.x = x;
+    r_src.y = y;
+    r_src.w = w;
+    r_src.h = h;
+
+    ret = SDL_RenderCopy(sdl_render, sdl_tex, &r_src, 0);
+    if (ret)
+	sdl_log("SDL: unable to copy texture to renderer (%s)\n", sdl_GetError());
+
+    SDL_RenderPresent(sdl_render);
+    SDL_UnlockMutex(sdl_mutex);
+}
+
+
+static void
+sdl_blit_ex(int x, int y, int w, int h)
 {
     SDL_Rect r_src;
     void *pixeldata;
@@ -478,7 +514,7 @@ sdl_init_common(int flags)
     atexit(sdl_close);
 
     /* Register our renderer! */
-    video_setblit(sdl_blit);
+    video_setblit((video_grayscale || invert_display) ? sdl_blit_ex : sdl_blit);
 
     sdl_enabled = 1;
     sdl_mutex = SDL_CreateMutex();
@@ -582,4 +618,6 @@ sdl_reload(void)
 
 	SDL_UnlockMutex(sdl_mutex);
     }
+
+    video_setblit((video_grayscale || invert_display) ? sdl_blit_ex : sdl_blit);
 }
diff --git a/src/win/win_ui.c b/src/win/win_ui.c
index f2d00ef1c..40f9068b0 100644
--- a/src/win/win_ui.c
+++ b/src/win/win_ui.c
@@ -805,6 +805,7 @@ MainWindowProcedure(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
 			case IDM_VID_INVERT:
 				video_toggle_option(hmenu, &invert_display, IDM_VID_INVERT);
 				video_copy = (video_grayscale || invert_display) ? video_transform_copy : memcpy;
+				plat_vidapi_reload();
 				break;
 
 			case IDM_VID_OVERSCAN:
@@ -838,6 +839,7 @@ MainWindowProcedure(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
 				CheckMenuItem(hmenu, IDM_VID_GRAY_RGB+video_grayscale, MF_UNCHECKED);
 				video_grayscale = LOWORD(wParam) - IDM_VID_GRAY_RGB;
 				video_copy = (video_grayscale || invert_display) ? video_transform_copy : memcpy;
+				plat_vidapi_reload();
 				CheckMenuItem(hmenu, IDM_VID_GRAY_RGB+video_grayscale, MF_CHECKED);
 				device_force_redraw();
 				config_save();