From 288d322c0b679675a80c0fc763b1063613c77ce5 Mon Sep 17 00:00:00 2001
From: Simon Howard
Date: Wed, 24 Nov 2010 22:43:37 +0000
Subject: Add configuration file parameter and command line option to specify
 the screen pixel depth.

Subversion-branch: /trunk/chocolate-doom
Subversion-revision: 2166
---
 setup/configfile.c |  1 +
 setup/display.c    |  1 +
 setup/display.h    |  1 +
 src/i_video.c      | 42 ++++++++++++++++++++++++++++++++++--------
 src/i_video.h      |  1 +
 src/m_config.c     |  6 ++++++
 6 files changed, 44 insertions(+), 8 deletions(-)

diff --git a/setup/configfile.c b/setup/configfile.c
index 2a3cb845..885bbd8f 100644
--- a/setup/configfile.c
+++ b/setup/configfile.c
@@ -265,6 +265,7 @@ static default_t extra_defaults_list[] =
     {"startup_delay",               &startup_delay, DEFAULT_INT, 0, 0},
     {"screen_width",                &screen_width, DEFAULT_INT, 0, 0},
     {"screen_height",               &screen_height, DEFAULT_INT, 0, 0},
+    {"screen_bpp",                  &screen_bpp, DEFAULT_INT, 0, 0},
     {"grabmouse",                   &grabmouse, DEFAULT_INT, 0, 0},
     {"novert",                      &novert, DEFAULT_INT, 0, 0},
     {"mouse_acceleration",          &mouse_acceleration, DEFAULT_FLOAT, 0, 0},
diff --git a/setup/display.c b/setup/display.c
index 596b8a43..f9e2f712 100644
--- a/setup/display.c
+++ b/setup/display.c
@@ -75,6 +75,7 @@ int aspect_ratio_correct = 1;
 int fullscreen = 1;
 int screen_width = 320;
 int screen_height = 200;
+int screen_bpp = 8;
 int startup_delay = 1000;
 int show_endoom = 1;
 
diff --git a/setup/display.h b/setup/display.h
index f0c76184..2419e807 100644
--- a/setup/display.h
+++ b/setup/display.h
@@ -26,6 +26,7 @@ extern int autoadjust_video_settings;
 extern int aspect_ratio_correct;
 extern int fullscreen;
 extern int screen_width, screen_height;
+extern int screen_bpp;
 extern int startup_delay;
 extern int show_endoom;
 extern char *video_driver;
diff --git a/src/i_video.c b/src/i_video.c
index 1139157d..577b7415 100644
--- a/src/i_video.c
+++ b/src/i_video.c
@@ -126,6 +126,10 @@ static boolean native_surface;
 int screen_width = SCREENWIDTH;
 int screen_height = SCREENHEIGHT;
 
+// Color depth.
+
+int screen_bpp = 8;
+
 // Automatically adjust video settings if the selected mode is 
 // not a valid video mode.
 
@@ -1405,6 +1409,33 @@ static void CheckCommandLine(void)
         screen_height = atoi(myargv[i + 1]);
     }
 
+    //!
+    // @category video
+    // @arg <bpp>
+    //
+    // Specify the color depth of the screen, in bits per pixel.
+    //
+
+    i = M_CheckParm("-bpp");
+
+    if (i > 0)
+    {
+        screen_bpp = atoi(myargv[i + 1]);
+    }
+
+    // Because we love Eternity:
+
+    //!
+    // @category video
+    //
+    // Set the color depth of the screen to 32 bits per pixel.
+    //
+
+    if (M_CheckParm("-8in32"))
+    {
+        screen_bpp = 32;
+    }
+
     //!
     // @category video
     // @arg <WxY>
@@ -1558,7 +1589,6 @@ static void SetVideoMode(screen_mode_t *mode, int w, int h)
 {
     byte *doompal;
     int flags = 0;
-    int bpp = 8;
 
     doompal = W_CacheLumpName(DEH_String("PLAYPAL"), PU_CACHE);
 
@@ -1573,11 +1603,7 @@ static void SetVideoMode(screen_mode_t *mode, int w, int h)
 
     flags |= SDL_SWSURFACE;
 
-    if (M_CheckParm("-8in32"))
-    {
-        bpp = 32;
-    }
-    else
+    if (screen_bpp == 8)
     {
         flags |= SDL_HWPALETTE | SDL_DOUBLEBUF;
     }
@@ -1591,12 +1617,12 @@ static void SetVideoMode(screen_mode_t *mode, int w, int h)
         flags |= SDL_RESIZABLE;
     }
 
-    screen = SDL_SetVideoMode(w, h, bpp, flags);
+    screen = SDL_SetVideoMode(w, h, screen_bpp, flags);
 
     if (screen == NULL)
     {
         I_Error("Error setting video mode %ix%ix%ibpp: %s\n",
-                w, h, bpp, SDL_GetError());
+                w, h, screen_bpp, SDL_GetError());
     }
 
     if (screen->format->BitsPerPixel == 8)
diff --git a/src/i_video.h b/src/i_video.h
index 94ffcc29..44fe1cd2 100644
--- a/src/i_video.h
+++ b/src/i_video.h
@@ -89,6 +89,7 @@ extern char *video_driver;
 extern int autoadjust_video_settings;
 extern boolean screenvisible;
 extern int screen_width, screen_height;
+extern int screen_bpp;
 extern int fullscreen;
 extern int aspect_ratio_correct;
 extern int grabmouse;
diff --git a/src/m_config.c b/src/m_config.c
index 2065700e..a4cacd95 100644
--- a/src/m_config.c
+++ b/src/m_config.c
@@ -615,6 +615,12 @@ static default_t extra_defaults_list[] =
 
     CONFIG_VARIABLE_INT(screen_height,             screen_height),
 
+    //!
+    // Color depth of the screen, in bits.
+    //
+
+    CONFIG_VARIABLE_INT(screen_bpp,                screen_bpp),
+
     //!
     // If this is non-zero, the mouse will be "grabbed" when running
     // in windowed mode so that it can be used as an input device.
-- 
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