dostunnel
annotate src/wvga.c @ 1:5d7f784002b0
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| author | John Tsiombikas <nuclear@member.fsf.org> |
|---|---|
| date | Fri, 15 Mar 2013 16:49:32 +0200 |
| parents | |
| children | a8024271c662 |
| rev | line source |
|---|---|
| nuclear@0 | 1 #include <stdio.h> |
| nuclear@0 | 2 #include <stdlib.h> |
| nuclear@0 | 3 #include <string.h> |
| nuclear@0 | 4 #include "wvga.h" |
| nuclear@0 | 5 #include "dpmi.h" |
| nuclear@0 | 6 |
| nuclear@0 | 7 /* VGA DAC registers used for palette setting in 8bpp modes */ |
| nuclear@0 | 8 #define VGA_DAC_STATE 0x3c7 |
| nuclear@0 | 9 #define VGA_DAC_ADDR_RD 0x3c7 |
| nuclear@0 | 10 #define VGA_DAC_ADDR_WR 0x3c8 |
| nuclear@0 | 11 #define VGA_DAC_DATA 0x3c9 |
| nuclear@0 | 12 |
| nuclear@0 | 13 static void *framebuffer; |
| nuclear@0 | 14 |
| nuclear@0 | 15 int set_video_mode(int mode) |
| nuclear@0 | 16 { |
| nuclear@0 | 17 struct dpmi_real_regs regs; |
| nuclear@0 | 18 |
| nuclear@0 | 19 memset(®s, 0, sizeof regs); |
| nuclear@0 | 20 regs.eax = mode; |
| nuclear@0 | 21 dpmi_real_int(0x10, ®s); |
| nuclear@0 | 22 |
| nuclear@0 | 23 if(regs.eax == 0x100) { |
| nuclear@0 | 24 return -1; |
| nuclear@0 | 25 } |
| nuclear@0 | 26 |
| nuclear@0 | 27 if(mode != 3) { |
| nuclear@0 | 28 framebuffer = (void*)dpmi_mmap((void*)0xa0000, 64000); |
| nuclear@0 | 29 } else { |
| nuclear@0 | 30 dpmi_munmap((void*)0xa0000); |
| nuclear@0 | 31 } |
| nuclear@0 | 32 return 0; |
| nuclear@0 | 33 } |
| nuclear@0 | 34 |
| nuclear@0 | 35 void set_palette(int idx, int *col, int count) |
| nuclear@0 | 36 { |
| nuclear@0 | 37 int i; |
| nuclear@0 | 38 |
| nuclear@0 | 39 __asm { |
| nuclear@0 | 40 mov dx, VGA_DAC_ADDR_WR |
| nuclear@0 | 41 mov eax, idx |
| nuclear@0 | 42 out dx, al |
| nuclear@0 | 43 } |
| nuclear@0 | 44 |
| nuclear@0 | 45 for(i=0; i<count; i++) { |
| nuclear@0 | 46 unsigned char r = *col++ >> 2; |
| nuclear@0 | 47 unsigned char g = *col++ >> 2; |
| nuclear@0 | 48 unsigned char b = *col++ >> 2; |
| nuclear@0 | 49 |
| nuclear@0 | 50 __asm { |
| nuclear@0 | 51 mov dx, VGA_DAC_DATA |
| nuclear@0 | 52 mov al, r |
| nuclear@0 | 53 out dx, al |
| nuclear@0 | 54 mov al, g |
| nuclear@0 | 55 out dx, al |
| nuclear@0 | 56 mov al, b |
| nuclear@0 | 57 out dx, al |
| nuclear@0 | 58 } |
| nuclear@0 | 59 } |
| nuclear@0 | 60 } |
| nuclear@0 | 61 |
| nuclear@0 | 62 void set_pal_entry(int idx, int r, int g, int b) |
| nuclear@0 | 63 { |
| nuclear@0 | 64 int color[3]; |
| nuclear@0 | 65 color[0] = r; |
| nuclear@0 | 66 color[1] = g; |
| nuclear@0 | 67 color[2] = b; |
| nuclear@0 | 68 |
| nuclear@0 | 69 set_palette(idx, color, 1); |
| nuclear@0 | 70 } |
| nuclear@0 | 71 |
| nuclear@0 | 72 void copy_frame(void *pixels) |
| nuclear@0 | 73 { |
| nuclear@0 | 74 memcpy(framebuffer, pixels, 64000); |
| nuclear@0 | 75 } |