Atlas - SDL_dosmodes.h
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[FILE BEGIN]
1/*
2  Simple DirectMedia Layer
3  Copyright (C) 1997-2026 Sam Lantinga <[email protected]>
4
5  This software is provided 'as-is', without any express or implied
6  warranty.  In no event will the authors be held liable for any damages
7  arising from the use of this software.
8
9  Permission is granted to anyone to use this software for any purpose,
10  including commercial applications, and to alter it and redistribute it
11  freely, subject to the following restrictions:
12
13  1. The origin of this software must not be misrepresented; you must not
14     claim that you wrote the original software. If you use this software
15     in a product, an acknowledgment in the product documentation would be
16     appreciated but is not required.
17  2. Altered source versions must be plainly marked as such, and must not be
18     misrepresented as being the original software.
19  3. This notice may not be removed or altered from any source distribution.
20*/
21
22#ifndef SDL_dosmodes_h_
23#define SDL_dosmodes_h_
24
25#include "SDL_internal.h"
26
27extern bool DOSVESA_GetDisplayModes(SDL_VideoDevice *device, SDL_VideoDisplay *sdl_display);
28extern bool DOSVESA_SetDisplayMode(SDL_VideoDevice *device, SDL_VideoDisplay *sdl_display, SDL_DisplayMode *mode);
29extern bool DOSVESA_SupportsVESA(void);
30extern void DOSVESA_FreeVESAInfo(void);
31extern Uint32 DOSVESA_GetVESATotalMemory(void);
32extern const char *DOSVESA_GetGPUName(void);
33
34// VGA DAC (Digital-to-Analog Converter) ports for palette programming
35#define VGA_DAC_PIXEL_MASK  0x3C6 // pixel mask register (read/write, VGA-only)
36#define VGA_DAC_WRITE_INDEX 0x3C8 // write index register (set starting color index)
37#define VGA_DAC_DATA        0x3C9 // data register (write R, G, B in sequence)
38
39// VGA Input Status Register 1 (for vblank detection)
40#define VGA_STATUS_PORT   0x3DA
41#define VGA_STATUS_VBLANK 0x08 // bit 3: vertical retrace active
42
43// VBE window attribute bits (WinAAttributes / WinBAttributes field)
44#define VBE_WINATTR_SUPPORTED 0x01 // bit 0: window is supported
45#define VBE_WINATTR_WRITABLE  0x04 // bit 2: window is writable
46
47// Combination: a usable banked window must be both supported and writable
48#define VBE_WINATTR_USABLE (VBE_WINATTR_SUPPORTED | VBE_WINATTR_WRITABLE)
49
50#endif // SDL_dosmodes_h_
51
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