X-Git-Url: http://4ch.mooo.com/gitweb/?a=blobdiff_plain;f=src%2Flib%2Fmodex16.c;h=e184dc1e2e0e4d251b7c17bb866cd3b039dddde7;hb=280b2698e9eb1af403b0ae29c357a4ae8fdd51a3;hp=624a96d683366ec3e105636e6511d821d7b2dd6a;hpb=c3104b1494bd0f31ce49e3365d36e4ace02e69c7;p=16.git

diff --git a/src/lib/modex16.c b/src/lib/modex16.c
index 624a96d6..e184dc1e 100755
--- a/src/lib/modex16.c
+++ b/src/lib/modex16.c
@@ -40,23 +40,31 @@ void VGAmodeX(sword vq, global_game_variables_t *gv)
 {
 	union REGS in, out;
 
-	if(!vq)
-	{ // deinit the video
-		// change to the video mode we were in before we switched to mode 13h
-		modexLeave();
-		in.h.ah = 0x00;
-		in.h.al = gv->old_mode;
-		int86(0x10, &in, &out);
-
-	}
-	else if(vq==1)
-	{ // init the video
-		// get old video mode
-		in.h.ah = 0xf;
-		int86(0x10, &in, &out);
-		gv->old_mode = out.h.al;
-		// enter mode
-		modex__320x240_256__Enter(gv);
+	switch (vq)
+	{
+		case 0: // deinit the video
+			// change to the video mode we were in before we switched to mode 13h
+			modexLeave();
+			in.h.ah = 0x00;
+			in.h.al = gv->old_mode;
+			int86(0x10, &in, &out);
+		break;
+		case 1: // init the video
+			// get old video mode
+			in.h.ah = 0xf;
+			int86(0x10, &in, &out);
+			gv->old_mode = out.h.al;
+			// enter mode
+			modex__320x240_256__Enter(gv);
+		break;
+		case 2: // init the video
+			// get old video mode
+			in.h.ah = 0xf;
+			int86(0x10, &in, &out);
+			gv->old_mode = out.h.al;
+			// enter mode
+			modex__256x192_256__Enter(gv);
+		break;
 	}
 }
 
@@ -70,55 +78,48 @@ vgaSetMode(byte mode)
   int86(VIDEO_INT, &regs, &regs);
 }
 
-
 /* -========================= Entry  Points ==========================- */
 void
 modex__320x240_256__Enter(global_game_variables_t *gv)
 {
 	word i;
 	dword far*ptr=(dword far*)VGA;      /* used for faster screen clearing */
-	word CRTParms[] = {
-//		0x5f00,		/* horizontal total */
-//		0x3f01,		/* horizontal display enable end */
-		0x0d06,         /* vertical total */
-		0x3e07,         /* overflow (bit 8 of vertical counts) */
-		0x4109,         /* cell height (2 to double-scan */
-		0xea10,         /* v sync start */
-		0xac11,         /* v sync end and protect cr0-cr7 */
-		0xdf12,         /* vertical displayed */
-//		0x2013,		/* offset/logical width */
-		0x0014,         /* turn off dword mode */
-		0xe715,         /* v blank start */
-		0x0616,         /* v blank end */
-		0xe317          /* turn on byte mode */
-	};
-
-	int CRTParmCount = sizeof(CRTParms) / sizeof(CRTParms[0]);
+
+	int CRTParmCount = sizeof(ModeX_320x240regs) / sizeof(ModeX_320x240regs[0]);
 	/* width and height */
 	//TODO WWWW
 
-	/* TODO save current video mode and palette */
-	vgaSetMode(VGA_256_COLOR_MODE);
+	/* common mode X initiation stuff~ */
+	modexsetBaseXMode();
 
-	/* disable chain4 mode */
-	outpw(SC_INDEX, 0x0604);
+	/* send the CRTParms */
+	for(i=0; i<CRTParmCount; i++) {
+		outpw(CRTC_INDEX, ModeX_320x240regs[i]);
+	}
 
-	/* synchronous reset while setting Misc Output */
-	outpw(SC_INDEX, 0x0100);
+	/* clear video memory */
+	outpw(SC_INDEX, 0x0f02);
+	for(i=0; i<0x8000; i++) {
+		ptr[i] = 0x0000;
+	}
+}
 
-	/* select 25 MHz dot clock & 60 Hz scanning rate */
-	outp(MISC_OUTPUT, 0xe3);
+void
+modex__256x192_256__Enter(global_game_variables_t *gv)
+{
+	word i;
+	dword far*ptr=(dword far*)VGA;      /* used for faster screen clearing */
 
-	/* undo reset (restart sequencer) */
-	outpw(SC_INDEX, 0x0300);
+	int CRTParmCount = sizeof(ModeX_256x192regs) / sizeof(ModeX_256x192regs[0]);
+	/* width and height */
+	//TODO WWWW
 
-	/* reprogram the CRT controller */
-	outp(CRTC_INDEX, 0x11); /* VSync End reg contains register write prot */
-	outp(CRTC_DATA, 0x7f);  /* get current write protect on varios regs */
+	/* common mode X initiation stuff~ */
+	modexsetBaseXMode();
 
 	/* send the CRTParms */
 	for(i=0; i<CRTParmCount; i++) {
-		outpw(CRTC_INDEX, CRTParms[i]);
+		outpw(CRTC_INDEX, ModeX_256x192regs[i]);
 	}
 
 	/* clear video memory */
@@ -128,13 +129,42 @@ modex__320x240_256__Enter(global_game_variables_t *gv)
 	}
 }
 
-
 void
 modexLeave() {
     /* TODO restore original mode and palette */
     vgaSetMode(TEXT_MODE);
 }
 
+//    setBaseXMode() does the initialization to make the VGA ready to
+//    accept any combination of configuration register settings.  This
+//    involves enabling writes to index 0 to 7 of the CRT controller (port
+//    0x3D4), by clearing the most significant bit (bit 7) of index 0x11.
+void
+modexsetBaseXMode(void)
+{
+	word temp;
+	/* TODO save current video mode and palette */
+	vgaSetMode(VGA_256_COLOR_MODE);
+
+	/* disable chain4 mode */
+	outpw(SC_INDEX, 0x0604);
+
+	/* synchronous reset while setting Misc Output */
+	outpw(SC_INDEX, 0x0100);
+
+	/* select 25 MHz dot clock & 60 Hz scanning rate */
+	outp(MISC_OUTPUT, 0xe3);
+
+	/* undo reset (restart sequencer) */
+	outpw(SC_INDEX, 0x0300);
+
+	/* reprogram the CRT controller */
+	outp(CRTC_INDEX, 0x11); /* VSync End reg contains register write prot */
+//	temp = inp(CRTC_DATA) & 0x7F;
+//	outp(CRTC_INDEX, 0x11);
+	outp(CRTC_DATA, 0x7f);  /* get current write protect on varios regs */
+//	outp(CRTC_DATA, temp);  /* get current write protect on varios regs */
+}
 
 page_t
 modexDefaultPage() {