Atlas - SDL_dosvideo.h
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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_dosvideo_h
23#define SDL_dosvideo_h
24
25#include "../../core/dos/SDL_dos.h"
26#include "../SDL_sysvideo.h"
27#include "SDL_internal.h"
28
29struct SDL_DisplayModeData
30{
31    // we can add more fields to this, if we want them, later.
32    Uint16 mode_id;
33    Uint16 attributes;
34    Uint16 pitch;
35    Uint16 w;
36    Uint16 h;
37    Uint8 num_planes;
38    Uint8 bpp;
39    Uint8 memory_model;
40    Uint8 num_image_pages;
41    Uint8 red_mask_size;
42    Uint8 red_mask_pos;
43    Uint8 green_mask_size;
44    Uint8 green_mask_pos;
45    Uint8 blue_mask_size;
46    Uint8 blue_mask_pos;
47    Uint32 physical_base_addr;
48
49    // VBE 1.2 banked framebuffer fields (used when LFB is not available)
50    bool has_lfb;           // true if linear framebuffer is available (VBE 2.0+)
51    Uint16 win_granularity; // bank positioning granularity in KB
52    Uint16 win_size;        // window size in KB (typically 64)
53    Uint16 win_a_segment;   // real-mode segment of window A (typically 0xA000)
54    Uint32 win_func_ptr;    // real-mode far pointer to bank-switch function
55    Uint8 win_a_attributes; // window A capabilities
56};
57
58struct SDL_VideoData
59{
60    __dpmi_meminfo mapping; // video memory mapping.
61    SDL_DisplayMode current_mode;
62    DOS_InterruptHook keyboard_interrupt_hook;
63    Uint32 palette_version;       // tracks SDL_Palette::version to detect changes
64    Uint16 original_vbe_mode;     // VBE mode number at startup
65    void *vbe_state_buffer;       // saved VBE state (from VBE 0x4F04)
66    Uint32 vbe_state_buffer_size; // size of the state buffer
67
68    // Mouse sensitivity (mickeys per pixel), queried from INT 33h function 0x1B
69    float mickeys_per_hpixel; // horizontal mickeys per pixel (default: 8)
70    float mickeys_per_vpixel; // vertical mickeys per pixel (default: 16)
71
72    // Page-flipping (double-buffering) state
73    int current_page;         // 0 or 1: which page is currently displayed
74    Uint32 page_offset[2];    // byte offset of each page within video memory
75    bool page_flip_available; // true if mode supports double-buffering
76    bool banked_mode;         // true if current mode uses banked (not LFB) access
77};
78
79struct SDL_DisplayData
80{
81    int unused; // for now
82};
83
84struct SDL_WindowData
85{
86    int framebuffer_vsync;
87};
88
89#endif // SDL_dosvideo_h
90
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