From 0ffcb107af4b440f06d380d9da851383f45761ea Mon Sep 17 00:00:00 2001
From: Austin Hurst <mynameisaustinhurst@gmail.com>
Date: Fri, 16 Jun 2023 01:18:15 -0300
Subject: [PATCH] Implement SCALE_2X for Fallout 2 (#306)

---
 src/svga.cc | 19 ++++++++++++++++---
 src/svga.h  |  2 +-
 2 files changed, 17 insertions(+), 4 deletions(-)

diff --git a/src/svga.cc b/src/svga.cc
index e361fea..0d90650 100644
--- a/src/svga.cc
+++ b/src/svga.cc
@@ -102,6 +102,7 @@ void _zero_vid_mem()
 int _GNW95_init_mode_ex(int width, int height, int bpp)
 {
     bool fullscreen = true;
+    int scale = 1;
 
     Config resolutionConfig;
     if (configInit(&resolutionConfig)) {
@@ -121,6 +122,18 @@ int _GNW95_init_mode_ex(int width, int height, int bpp)
                 fullscreen = !windowed;
             }
 
+            int scaleValue;
+            if (configGetInt(&resolutionConfig, "MAIN", "SCALE_2X", &scaleValue)) {
+                scale = scaleValue + 1; // 0 = 1x, 1 = 2x
+                // Only allow scaling if resulting game resolution is >= 640x480
+                if ((width / scale) < 640 || (height / scale) < 480) {
+                    scale = 1;
+                } else {
+                    width /= scale;
+                    height /= scale;
+                }
+            }
+
             configGetBool(&resolutionConfig, "IFACE", "IFACE_BAR_MODE", &gInterfaceBarMode);
             configGetInt(&resolutionConfig, "IFACE", "IFACE_BAR_WIDTH", &gInterfaceBarWidth);
             configGetInt(&resolutionConfig, "IFACE", "IFACE_BAR_SIDE_ART", &gInterfaceSidePanelsImageId);
@@ -129,7 +142,7 @@ int _GNW95_init_mode_ex(int width, int height, int bpp)
         configFree(&resolutionConfig);
     }
 
-    if (_GNW95_init_window(width, height, fullscreen) == -1) {
+    if (_GNW95_init_window(width, height, fullscreen, scale) == -1) {
         return -1;
     }
 
@@ -157,7 +170,7 @@ int _init_vesa_mode(int width, int height)
 }
 
 // 0x4CAEDC
-int _GNW95_init_window(int width, int height, bool fullscreen)
+int _GNW95_init_window(int width, int height, bool fullscreen, int scale)
 {
     if (gSdlWindow == NULL) {
         SDL_SetHint(SDL_HINT_RENDER_DRIVER, "opengl");
@@ -172,7 +185,7 @@ int _GNW95_init_window(int width, int height, bool fullscreen)
             windowFlags |= SDL_WINDOW_FULLSCREEN;
         }
 
-        gSdlWindow = SDL_CreateWindow(gProgramWindowTitle, SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, width, height, windowFlags);
+        gSdlWindow = SDL_CreateWindow(gProgramWindowTitle, SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, width * scale, height * scale, windowFlags);
         if (gSdlWindow == NULL) {
             return -1;
         }
diff --git a/src/svga.h b/src/svga.h
index 510d724..b5882df 100644
--- a/src/svga.h
+++ b/src/svga.h
@@ -31,7 +31,7 @@ void _get_start_mode_();
 void _zero_vid_mem();
 int _GNW95_init_mode_ex(int width, int height, int bpp);
 int _init_vesa_mode(int width, int height);
-int _GNW95_init_window(int width, int height, bool fullscreen);
+int _GNW95_init_window(int width, int height, bool fullscreen, int scale);
 int directDrawInit(int width, int height, int bpp);
 void directDrawFree();
 void directDrawSetPaletteInRange(unsigned char* a1, int a2, int a3);