added stuff to help me study 0.exe it is a complex program wwww what is getting to...

[16.git] / src / lib / 16_vl.c

diff --git a/src/lib/16_vl.c b/src/lib/16_vl.c
index 9369ce49ab7b2c2e88c086962684dae117fd00c0..652ef89c2491b898bd25908b6d63c70f5bee7504 100755 (executable)
--- a/src/lib/16_vl.c
+++ b/src/lib/16_vl.c
@@ -369,6 +369,37 @@ modexShowPage_(page_t *page)
        outp(AC_INDEX, (page->dx & 0x03) << 1);\r
 }\r
 \r
+void\r
+modexShowPageVsync(page_t *page) {\r
+       word high_address, low_address, offset;\r
+       byte crtcOffset;\r
+\r
+       /* calculate offset */\r
+       offset = (word) page->data;\r
+       offset += page->dy * (page->width >> 2 );\r
+       offset += page->dx >> 2;\r
+\r
+       /* calculate crtcOffset according to virtual width */\r
+       crtcOffset = page->width >> 3;\r
+\r
+       high_address = HIGH_ADDRESS | (offset & 0xff00);\r
+       low_address  = LOW_ADDRESS  | (offset << 8);\r
+\r
+       /* wait for appropriate timing and then program CRTC */\r
+       while ((inp(INPUT_STATUS_1) & DISPLAY_ENABLE));\r
+       outpw(CRTC_INDEX, high_address);\r
+       outpw(CRTC_INDEX, low_address);\r
+       outp(CRTC_INDEX, 0x13);\r
+       outp(CRTC_DATA, crtcOffset);\r
+\r
+       /* wait for one retrace */\r
+       while (!(inp(INPUT_STATUS_1) & VRETRACE));\r
+\r
+       /* do PEL panning here */\r
+       outp(AC_INDEX, 0x33);\r
+       outp(AC_INDEX, (page->dx & 0x03) << 1);\r
+}\r
+\r
 void\r
 modexPanPage(page_t *page, int dx, int dy) {\r
        page->dx = dx;\r