2 * $Source: /cvs/cvsroot/d2x/arch/dos/vesa.c,v $
5 * $Date: 2004-05-21 01:31:49 $
9 * $Log: not supported by cvs2svn $
10 * Revision 1.3 2001/10/19 09:01:56 bradleyb
11 * Moved arch/sdl_* to arch/sdl
13 * Revision 1.2 2001/01/29 13:35:08 bradleyb
14 * Fixed build system, minor fixes
28 #define SC_INDEX 0x3c4
29 #define CRTC_INDEX 0x3d4
30 #define CRTC_DATA 0x3d5
35 /* this comes from Allegro */
36 typedef struct vesa_mode_info
38 unsigned short ModeAttributes;
39 unsigned char WinAAttributes;
40 unsigned char WinBAttributes;
41 unsigned short WinGranularity;
42 unsigned short WinSize;
43 unsigned short WinASegment;
44 unsigned short WinBSegment;
45 unsigned long WinFuncPtr;
46 unsigned short BytesPerScanLine;
47 unsigned short XResolution;
48 unsigned short YResolution;
49 unsigned char XCharSize;
50 unsigned char YCharSize;
51 unsigned char NumberOfPlanes;
52 unsigned char BitsPerPixel;
53 unsigned char NumberOfBanks;
54 unsigned char MemoryModel;
55 unsigned char BankSize;
56 unsigned char NumberOfImagePages;
57 unsigned char Reserved_page;
58 unsigned char RedMaskSize;
59 unsigned char RedMaskPos;
60 unsigned char GreenMaskSize;
61 unsigned char GreenMaskPos;
62 unsigned char BlueMaskSize;
63 unsigned char BlueMaskPos;
64 unsigned char ReservedMaskSize;
65 unsigned char ReservedMaskPos;
66 unsigned char DirectColorModeInfo;
67 unsigned long PhysBasePtr;
68 unsigned long OffScreenMemOffset;
69 unsigned short OffScreenMemSize;
70 unsigned char Reserved[206];
71 } __attribute__ ((packed)) vesa_mode_info;
74 int gr_vesa_checkmode(int mode) {
77 vesa_mode_info *mode_info;
79 if (!(mode_info = dpmi_get_temp_low_buffer( 1024 )))
83 rregs.edi = DPMI_real_offset(mode_info);
84 rregs.es = DPMI_real_segment(mode_info);
85 dpmi_real_int386x( 0x10, &rregs );
86 if (rregs.eax != 0x4f)
87 return 5; /* no vesa */
88 if (!(mode_info->ModeAttributes & 1))
89 return 4; /* unsupported mode */
92 i = mode_info->WinGranularity;
98 return 2; /* incompatible window granularity */
102 int gr_vesa_setmode(int mode) {
105 if ((ret = gr_vesa_checkmode(mode)))
107 asm volatile("int $0x10" : "=a" (ret) : "a" (0x4f02), "b" (mode));
108 return (ret == 0x4f) ? 0 : 4;
111 inline void gr_vesa_setpage(int bank)
115 if (bank != lastbank)
116 asm volatile("int $0x10"
118 : "0" (0x4f05), "b" (0), "d" ((lastbank = bank) << bankshift));
121 void gr_vesa_incpage() {
122 gr_vesa_setpage(lastbank + 1);
125 void gr_vesa_setstart(int col, int row)
129 asm volatile("int $0x10"
130 : "=a" (dummy) : "0" (0x4f07), "b" (0), "c" (col), "d" (row));
133 int gr_vesa_setlogical(int line_width)
138 asm volatile("int $0x10"
139 : "=c" (ret), "=a" (dummy) : "1" (0x4f07), "b" (0), "c" (line_width));
143 void gr_vesa_scanline(int x1, int x2, int y, unsigned char color) {
144 int addr = (y * gr_var_bwidth) + x1;
145 int left = x2 - x1 + 1;
146 gr_vesa_setpage(addr >> 16);
149 if (left > (65536 - addr)) {
150 left -= (65536 - addr);
151 memset(gr_video_memory + addr, color, 65536 - addr);
155 memset(gr_video_memory + addr, color, left);
161 void gr_vesa_pixel(unsigned char color, unsigned int addr) {
162 gr_vesa_setpage(addr >> 16);
163 gr_video_memory[addr & 0xffff] = color;