setmode, crtc, list of standard modes

[dosdemo] / src / dos / vbe.c

diff --git a/src/dos/vbe.c b/src/dos/vbe.c
index 6225084..72f4b51 100644 (file)
--- a/src/dos/vbe.c
+++ b/src/dos/vbe.c
@@ -198,7 +198,7 @@ void vbe_print_mode_info(FILE *fp, struct vbe_mode_info *minf)
        if(minf->attr & VBE_ATTR_NOTVGA) fprintf(fp, " non-vga");
        if(minf->attr & VBE_ATTR_BANKED) fprintf(fp, " banked");
        if(minf->attr & VBE_ATTR_LFB) fprintf(fp, " lfb");
-       if(minf->attr & VBE_ATTR_2XSCAN) fprintf(fp, " dblscan");
+       if(minf->attr & VBE_ATTR_DBLSCAN) fprintf(fp, " dblscan");
        if(minf->attr & VBE_ATTR_ILACE) fprintf(fp, " ilace");
        if(minf->attr & VBE_ATTR_TRIPLEBUF) fprintf(fp, " trplbuf");
        if(minf->attr & VBE_ATTR_STEREO) fprintf(fp, " stereo");
@@ -206,3 +206,45 @@ void vbe_print_mode_info(FILE *fp, struct vbe_mode_info *minf)
        fprintf(fp, " ]\n");
        fflush(fp);
 }
+
+int vbe_setmode(uint16_t mode)
+{
+       struct dpmi_regs regs = {0};
+
+       regs.eax = 0x4f02;
+       regs.ebx = mode;
+       dpmi_int(0x10, &regs);
+
+       if((regs.eax & 0xffff) != 0x4f) {
+               return -1;
+       }
+       return 0;
+}
+
+int vbe_setmode_crtc(uint16_t mode, struct vbe_crtc_info *crtc)
+{
+       void *lowbuf;
+       uint16_t seg, sel;
+       struct dpmi_regs regs = {0};
+
+       assert(sizeof *crtc == 59);
+
+       if(!(seg = dpmi_alloc((sizeof *crtc + 15) / 16, &sel))) {
+               return -1;
+       }
+       lowbuf = (void*)((uint32_t)seg << 4);
+
+       memcpy(lowbuf, crtc, sizeof *crtc);
+
+       regs.eax = 0x4f02;
+       regs.ebx = mode;
+       regs.es = seg;
+       dpmi_int(0x10, &regs);
+
+       dpmi_free(sel);
+
+       if((regs.eax & 0xffff) != 0x4f) {
+               return -1;
+       }
+       return 0;
+}