added page flipping/scrolling VBE calls

[dosrtxon] / src / dos / vbe.c

diff --git a/src/dos/vbe.c b/src/dos/vbe.c
index 009d5ca..5b1afb5 100644 (file)
--- a/src/dos/vbe.c
+++ b/src/dos/vbe.c
@@ -130,6 +130,62 @@ void vbe_set_palette(int idx, int *col, int count, int bits)
        }
 }
 
+int vbe_set_disp_start(int x, int y, int when)
+{
+       struct dpmi_real_regs regs;
+
+       memset(&regs, 0, sizeof regs);
+       regs.eax = 0x4f07;
+       regs.ebx = when & 0xffff;
+       regs.ecx = x & 0xffff;
+       regs.edx = y & 0xffff;
+       dpmi_real_int(0x10, &regs);
+
+       if(regs.eax == 0x100) {
+               return -1;
+       }
+       return 0;
+}
+
+int vbe_set_scanlen(int len, int mode)
+{
+       struct dpmi_real_regs regs;
+
+       memset(&regs, 0, sizeof regs);
+       regs.eax = 0x4f06;
+       regs.ebx = mode;
+       regs.ecx = len & 0xffff;
+       dpmi_real_int(0x10, &regs);
+
+       if(regs.eax == 0x100) {
+               return -1;
+       }
+       return regs.ecx & 0xffff;
+}
+
+int vbe_get_scanlen(int mode)
+{
+       int res;
+       struct dpmi_real_regs regs;
+
+       memset(&regs, 0, sizeof regs);
+       regs.eax = 0x4f06;
+       regs.ebx = 1;
+       dpmi_real_int(0x10, &regs);
+
+       if(regs.eax == 0x100) {
+               return -1;
+       }
+
+       if(mode == VBE_SCANLEN_PIXELS) {
+               res = regs.ecx & 0xffff;
+       } else {
+               res = regs.ebx & 0xffff;
+       }
+       return res;
+}
+
+
 static unsigned int get_mask(int sz, int pos)
 {
        unsigned int i, mask = 0;