Add Centscreen extended modes support

--HG--
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%401065

README.MiNT

@@ -141,8 +141,8 @@ OpenGL:
 	parameters, in the standard one, it has 6 double parameters. If you want
 	to compile testdyngl, or any other SDL program that loads its OpenGL
 	library, you must change the glOrtho() prototype used in this program. In
-	osmesa.ldg, you can retrieve a glOrtho() with double parameters, by searching
-	for the function "glOrtho6d".
+	osmesa.ldg, you can retrieve a glOrtho() with double parameters, by
+	searching for the function "glOrtho6d".
 
 Xbios video:
 	Video chip is detected using the _VDO cookie.
@@ -156,8 +156,7 @@ Xbios video:
 		320x480x8 and 320x240x8 (software double-lined mode).
 	Falcon:
 		All modes supported by the current monitor (RVB or VGA).
-		BlowUp extended modes, ScreenBlaster 3 current mode, Centscreen current
-		mode.
+		BlowUp and Centscreen extended modes, ScreenBlaster 3 current mode.
 	Clones and any machine with monochrome monitor:
 		Not supported.
 

src/video/xbios/SDL_xbios.c

@@ -283,6 +283,7 @@ static int XBIOS_VideoInit(_THIS, SDL_PixelFormat *vformat)
 	/* and save current screen status (palette, screen address, video mode) */
 	XBIOS_nummodes = 0;
 	XBIOS_modelist = NULL;
+	XBIOS_centscreen = SDL_FALSE;
 
 	switch (XBIOS_cvdo >>16) {
 		case VDO_ST:
@@ -411,14 +412,16 @@ static int XBIOS_VideoInit(_THIS, SDL_PixelFormat *vformat)
 				current_mode++;
 			}
 
-			/* Initialize BlowUp or SB3 stuff if present */
+			/* Initialize BlowUp/SB3/Centscreen stuff if present */
 			if (Getcookie(C_BLOW, &cookie_blow) == C_FOUND) {
 				SDL_XBIOS_BlowupInit(this, (blow_cookie_t *)cookie_blow);
 			} else if (Getcookie(C_SCPN, &cookie_scpn) == C_FOUND) {
 				SDL_XBIOS_SB3Init(this, (scpn_cookie_t *)cookie_scpn);
 			} else if (Getcookie(C_CNTS, &cookie_cnts) == C_FOUND) {
-				SDL_XBIOS_CentscreenInit(this);
+				XBIOS_oldvmode = SDL_XBIOS_CentscreenInit(this);
+				XBIOS_centscreen = SDL_TRUE;
 			}
+
 			break;
 	}
 
@@ -680,7 +683,11 @@ static SDL_Surface *XBIOS_SetVideoMode(_THIS, SDL_Surface *current,
 			break;
 		case VDO_F30:
 #ifndef DEBUG_VIDEO_XBIOS
-			Vsetmode(new_video_mode->number);
+			if (XBIOS_centscreen) {
+				SDL_XBIOS_CentscreenSetmode(this, width, height, new_depth);
+			} else {
+				Vsetmode(new_video_mode->number);
+			}
 #endif
 			break;
 	}
@@ -892,7 +899,11 @@ static void XBIOS_VideoQuit(_THIS)
 			break;
 		case VDO_F30:
 			Setscreen(-1, XBIOS_oldvbase, -1);
-			Vsetmode(XBIOS_oldvmode);
+			if (XBIOS_centscreen) {
+				SDL_XBIOS_CentscreenRestore(this, XBIOS_oldvmode);
+			} else {
+				Vsetmode(XBIOS_oldvmode);
+			}
 			if (XBIOS_oldnumcol) {
 				VsetRGB(0, XBIOS_oldnumcol, XBIOS_oldpalette);
 			}

src/video/xbios/SDL_xbios.h

@@ -70,6 +70,8 @@ struct SDL_PrivateVideoData {
 	int pitch;				/* Destination line width for C2P */
 	int width, height;		/* Screen size for centered C2P */
 
+	SDL_bool centscreen;	/* Centscreen extension present ? */
+
 	SDL_Rect *SDL_modelist[NUM_MODELISTS][SDL_NUMMODES+1];
 	xbiosmode_t *videomodes[NUM_MODELISTS][SDL_NUMMODES+1];
 };
@@ -123,6 +125,7 @@ enum {
 #define XBIOS_pitch			(this->hidden->pitch)
 #define XBIOS_width			(this->hidden->width)
 #define XBIOS_height		(this->hidden->height)
+#define XBIOS_centscreen	(this->hidden->centscreen)
 
 /*--- Functions prototypes ---*/
 

src/video/xbios/SDL_xbios_centscreen.c

@@ -27,15 +27,18 @@
 */
 
 #include <stdlib.h>
+#include <string.h>
 
 #include <mint/falcon.h>
 
 #include "SDL_xbios.h"
 #include "SDL_xbios_centscreen.h"
 
-void SDL_XBIOS_CentscreenInit(_THIS)
+int SDL_XBIOS_CentscreenInit(_THIS)
 {
-	centscreen_mode_t	curmode;
+	centscreen_mode_t	curmode, listedmode;
+	unsigned long result;
+	int cur_handle;	/* Current Centscreen mode handle */
 
 	/* Reset current mode list */
 	if (XBIOS_modelist) {
@@ -44,10 +47,54 @@ void SDL_XBIOS_CentscreenInit(_THIS)
 		XBIOS_modelist = NULL;
 	}
 
-	/* Add current active mode */
+	/* Add Centscreen modes */
 	Vread(&curmode);
+	cur_handle = curmode.handle;
+	curmode.mode = curmode.physx = curmode.physy = curmode.plan =
+		curmode.logx = curmode.logy = -1;
 
-	SDL_XBIOS_AddMode(this, -1, curmode.physx, curmode.physy, curmode.plan,
-		SDL_FALSE
-	);
+	result = Vfirst(&curmode, &listedmode);
+	if (result==0) {
+		while (result==0) {
+			/* Don't add modes with virtual screen */
+			if ((listedmode.mode & CSCREEN_VIRTUAL)==0) {
+				/* Don't add modes with bpp<8 */
+				if (listedmode.plan>=8) {
+					SDL_XBIOS_AddMode(this, listedmode.mode, listedmode.physx,
+						listedmode.physy, listedmode.plan, SDL_FALSE
+					);
+				}
+			}
+			memcpy(&curmode, &listedmode, sizeof(centscreen_mode_t));
+			curmode.mode = curmode.physx = curmode.physy = curmode.plan =
+				curmode.logx = curmode.logy = -1;
+			result = Vnext(&curmode, &listedmode);
+		}		
+	} else {
+		fprintf(stderr, "No suitable Centscreen modes\n");
+	}
+
+	return cur_handle;
+}
+
+void SDL_XBIOS_CentscreenSetmode(_THIS, int width, int height, int planes)
+{
+	centscreen_mode_t	newmode, curmode;
+	
+	newmode.handle = newmode.mode = newmode.logx = newmode.logy = -1;
+	newmode.physx = width;
+	newmode.physy = height;
+	newmode.plan = planes;
+	Vwrite(0, &newmode, &curmode);
+}
+
+void SDL_XBIOS_CentscreenRestore(_THIS, int prev_handle)
+{
+	centscreen_mode_t	newmode, curmode;
+
+	/* Restore old video mode */
+	newmode.handle = prev_handle;
+	newmode.mode = newmode.physx = newmode.physy = newmode.plan =
+		newmode.logx = newmode.logy = -1;
+	Vwrite(0, &newmode, &curmode);
 }

src/video/xbios/SDL_xbios_centscreen.h

@@ -110,6 +110,8 @@ typedef struct {
 
 /*--- Functions prototypes ---*/
 
-void SDL_XBIOS_CentscreenInit(_THIS);
+int SDL_XBIOS_CentscreenInit(_THIS);
+void SDL_XBIOS_CentscreenSetmode(_THIS, int width, int height, int planes);
+void SDL_XBIOS_CentscreenRestore(_THIS, int prev_handle);
 
 #endif /* _SDL_xbios_centscreen_h */

src/video/xbios/SDL_xbios_sb3.c

@@ -28,6 +28,8 @@
 
 /*--- Includes ---*/
 
+#include <stdlib.h>
+
 #include "SDL_xbios.h"
 #include "SDL_xbios_sb3.h"
 
@@ -63,7 +65,6 @@ int SDL_XBIOS_SB3Usable(scpn_cookie_t *cookie_scpn)
 
 void SDL_XBIOS_SB3Init(_THIS, scpn_cookie_t *cookie_scpn)
 {
-	xbiosmode_t *current_mode;
 	scpn_screeninfo_t *scrinfo;
 
 	/* SB3 prevent changing video modes, we can only use current one */