X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?p=dosdemo;a=blobdiff_plain;f=src%2Fdos%2Fgfx.h;h=109bbcf6686f961f6e170af00294bbb1030852d6;hp=b19c99249c24793efb46239ccabc8ffaf1245735;hb=5f36e95f19ad8d7a5a1dd546ffeb54ce95d51749;hpb=0165ec15f868a16a70b56ada2d42db0cb69ea193

diff --git a/src/dos/gfx.h b/src/dos/gfx.h
index b19c992..109bbcf 100644
--- a/src/dos/gfx.h
+++ b/src/dos/gfx.h
@@ -15,7 +15,43 @@ int get_color_mask(unsigned int *rmask, unsigned int *gmask, unsigned int *bmask
 
 void set_palette(int idx, int r, int g, int b);
 
+enum {
+	FLIP_NOW,
+	FLIP_VBLANK,
+	FLIP_VBLANK_WAIT
+};
+/* page flip and return pointer to the start of the display area (front buffer) */
+void *page_flip(int vsync);
+
+#ifdef __WATCOMC__
 void wait_vsync(void);
+#pragma aux wait_vsync = \
+	"mov dx, 0x3da" \
+	"l1:" \
+	"in al, dx" \
+	"and al, 0x8" \
+	"jnz l1" \
+	"l2:" \
+	"in al, dx" \
+	"and al, 0x8" \
+	"jz l2" \
+	modify[al dx];
+#endif
+
+#ifdef __DJGPP__
+#define wait_vsync()  asm volatile ( \
+	"mov $0x3da, %%dx\n\t" \
+	"0:\n\t" \
+	"in %%dx, %%al\n\t" \
+	"and $8, %%al\n\t" \
+	"jnz 0b\n\t" \
+	"0:\n\t" \
+	"in %%dx, %%al\n\t" \
+	"and $8, %%al\n\t" \
+	"jz 0b\n\t" \
+	:::"%eax","%edx")
+#endif
+
 
 #ifdef __cplusplus
 }