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1 /**
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2 * VBE.C -- interface into VESA BIOS extensions from DJGPP-compiled
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3 * MS-DOS programs.
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4 *
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5 * Copyright (c) 2025 Paper
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6 *
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7 * Permission is hereby granted, free of charge, to any person obtaining a copy
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8 * of this software and associated documentation files (the "Software"), to deal
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9 * in the Software without restriction, including without limitation the rights
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10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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11 * copies of the Software, and to permit persons to whom the Software is
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12 * furnished to do so, subject to the following conditions:
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13 *
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14 * The above copyright notice and this permission notice shall be included in all
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15 * copies or substantial portions of the Software.
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16 *
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17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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23 * SOFTWARE.
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24 **/
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25
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26 #include <stdint.h>
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27
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28 enum {
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29 VBE_BLIT_UNINITIALIZED = 0,
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30 VBE_BLIT_FRAMEBUFFER,
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31 VBE_BLIT_BANKS,
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32 };
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33
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34 struct vbe {
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35 /* ---- PUBLIC MEMBERS ---- */
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36
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37 uint16_t width, height, pitch;
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38 uint8_t bpp; /* BYTES per pixel */
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39
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40 /* (width * height * bpp) */
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41 uint32_t size;
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42
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43 uint8_t r_size;
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44 uint8_t r_pos;
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45 uint8_t g_size;
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46 uint8_t g_pos;
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47 uint8_t b_size;
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48 uint8_t b_pos;
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49
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50 /* --- INTERNAL MEMBERS --- */
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51
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52 int blit_type;
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53 union {
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54 struct {
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55 uint32_t address;
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56 int selector;
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57 } fb;
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58 struct {
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59 uint32_t size;
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60 uint32_t granularity;
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61 } banks;
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62 } blit;
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63 };
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64
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65 #ifdef __GNUC__
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66 # define VBE_INLINE static inline __attribute__((__always_inline__))
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67 #else
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68 # define VBE_INLINE static inline
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69 #endif
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70
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71 /* VBE has a theoretical maximum resolution of 65535x65535. */
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72 int vbe_init(struct vbe *vbe, uint16_t width, uint16_t height);
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73 void vbe_blit(struct vbe *vbe, const void *ptr);
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74 void vbe_quit(struct vbe *vbe);
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75
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76 /* this is a convenience macro for converting 8-bit RGB values into
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77 * a full RGB value for use in a framebuffer. */
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78 #define VBE_RGB(/* struct vbe */vbe, /*uint8_t */r, /*uint8_t */g, /*uint8_t */b) \
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79 ( \
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80 ((((uint32_t)(r) & 0xFF) << (vbe).r_size >> 8) << (vbe).r_pos) \
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81 | ((((uint32_t)(g) & 0xFF) << (vbe).g_size >> 8) << (vbe).g_pos) \
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82 | ((((uint32_t)(b) & 0xFF) << (vbe).b_size >> 8) << (vbe).b_pos) \
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83 ) \
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84
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85 /* function variation of the above. */
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86 VBE_INLINE uint32_t vbe_rgb(struct vbe *vbe, uint8_t r, uint8_t g, uint8_t b)
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87 {
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88 return VBE_RGB(*vbe, r, g, b);
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89 }
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