229 lines
7.1 KiB
C
229 lines
7.1 KiB
C
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/**
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* Library for GameDev on DOS
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*
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* Alexander Popov <iiiypuk@fastmail.fm>
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* Version: 0.0.0
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*
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* LICENSE:
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* This is free and unencumbered software released into the public domain.
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* Anyone is free to copy, modify, publish, use, compile, sell, or
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* distribute this software, either in source code form or as a compiled
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* binary, for any purpose, commercial or non-commercial, and by any
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* means.
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*
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* In jurisdictions that recognize copyright laws, the author or authors
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* of this software dedicate any and all copyright interest in the
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* software to the public domain. We make this dedication for the benefit
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* of the public at large and to the detriment of our heirs and
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* successors. We intend this dedication to be an overt act of
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* relinquishment in perpetuity of all present and future rights to this
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* software under copyright law.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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* For more information, please refer to <http://unlicense.org/>
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*
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* THANKS:
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* David Brackeen - http://www.brackeen.com/vga/basics.html
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* Stanislav Sokolov - https://stanislavs.org/helppc/int_33-3.html
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* Team EQA - https://www.equestionanswers.com/c/c-int33-mouse-service.php
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*/
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#ifndef GDOS_H_
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#define GDOS_H_
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#include <dos.h>
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#include <conio.h>
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/* ... */
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#define GD_TRUE 1 /* bool true */
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#define GD_FALSE 0 /* bool false */
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#define VIDEO_INT 0x10 /* BIOS video interrupt */
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#define MOUSE_INTERRUPT 0x33 /* BIOS mouse interrupt */
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#define WRITE_DOT 0x0C /* BIOS func to plot a pixel */
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#define SET_MODE 0x00 /* BIOS func to set the video mode */
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#define TEXT_MODE 0x03 /* 80x25 text mode */
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#define VGA_4_COLOR_MODE 0x04 /* 320x200 4-color graphics mode */
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#define VGA_MONO_SM_MODE 0x05 /* 320x200 monochrome graphics mode */
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#define VGA_MONO_LG_MODE 0x06 /* 640x200 monochrome graphics mode */
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#define VGA_256_COLOR_MODE 0x13 /* 320x200 graphics mode */
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#define SCREEN_WIDTH 320 /* width in pixels of mode 0x13 */
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#define SCREEN_HEIGHT 200 /* height in pixels of mode 0x13 */
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#define GD_DRAW_FAST 1
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#define GD_DRAW_SLOW 0
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typedef unsigned char byte;
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byte *VGA=(byte *)0xA0000000L; /* this points to video memory */
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/* KEY CODES */
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#define key_ESC 27 /* ESCAPE key */
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#define key_A 65 /* A key */
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#define key_B 66 /* B key */
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#define key_C 67 /* C key */
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#define key_D 68 /* D key */
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#define key_E 69 /* E key */
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#define key_F 70 /* F key */
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#define key_G 71 /* G key */
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#define key_H 72 /* H key */
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#define key_I 73 /* I key */
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#define key_J 74 /* J key */
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#define key_K 75 /* K key */
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#define key_L 76 /* L key */
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#define key_M 77 /* M key */
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#define key_N 78 /* N key */
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#define key_O 79 /* O key */
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#define key_P 80 /* P key */
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#define key_Q 81 /* Q key */
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#define key_R 82 /* R key */
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#define key_S 83 /* S key */
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#define key_T 84 /* T key */
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#define key_U 85 /* U key */
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#define key_V 86 /* V key */
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#define key_W 87 /* W key */
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#define key_X 88 /* X key */
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#define key_Y 89 /* Y key */
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#define key_Z 90 /* Z key */
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#define key_a 97 /* a key */
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#define key_b 98 /* b key */
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#define key_c 99 /* c key */
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#define key_d 100 /* d key */
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#define key_e 101 /* e key */
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#define key_f 102 /* f key */
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#define key_g 103 /* g key */
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#define key_h 104 /* h key */
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#define key_i 105 /* i key */
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#define key_j 106 /* j key */
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#define key_k 107 /* k key */
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#define key_l 108 /* l key */
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#define key_m 109 /* m key */
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#define key_n 110 /* n key */
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#define key_o 111 /* o key */
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#define key_p 112 /* p key */
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#define key_q 113 /* q key */
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#define key_r 114 /* r key */
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#define key_s 115 /* s key */
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#define key_t 116 /* t key */
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#define key_u 117 /* u key */
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#define key_v 118 /* v key */
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#define key_w 119 /* w key */
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#define key_x 120 /* x key */
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#define key_y 121 /* y key */
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#define key_z 122 /* z key */
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/**
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* gd_set_mode(byte mode)
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* Sets the video mode
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*/
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void gd_set_mode(byte mode) {
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union REGS regs;
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regs.h.ah = SET_MODE;
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regs.h.al = mode;
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int86(VIDEO_INT, ®s, ®s);
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}
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/**
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* gd_draw_pixel(int x, int y, byte color, int draw_mode)
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* Draw pixel on VGA
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*/
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void gd_draw_pixel(int x, int y, byte color, int draw_mode) {
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union REGS regs;
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/* draw pixel as fast mode */
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if (draw_mode == 1) {
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VGA[y*SCREEN_WIDTH+x]=color;
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}
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/* draw pixel as slow mode */
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else {
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regs.h.ah = WRITE_DOT;
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regs.h.al = color;
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regs.x.cx = x;
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regs.x.dx = y;
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int86(VIDEO_INT, ®s, ®s);
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}
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}
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/**
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* gd_get_kb(int *key)
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* Gets the ASCII code of the pressed key from the keyboard
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*/
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void gd_get_kb(int *key) {
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if (kbhit()) {
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*key = getch();
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}
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}
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/**
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* gd_detect_mouse(void)
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* Return mouse support/available
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*/
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int gd_detect_mouse(void) {
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union REGS in, out;
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in.x.ax = 0;
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int86(MOUSE_INTERRUPT, &in, &out);
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/* Mouse support not available */
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if (out.x.ax != 0) { return GD_TRUE; }
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else { return GD_FALSE; }
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}
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/**
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* gd_show_mouse(void)
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* Show mouse cursor
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*/
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int gd_show_mouse(void) {
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union REGS in, out;
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in.x.ax = 1;
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int86(MOUSE_INTERRUPT, &in, &out);
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return GD_TRUE;
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}
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/**
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* gd_hide_mouse(void)
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* Hide mouse cursor
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*/
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int gd_hide_mouse(void) {
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union REGS in, out;
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in.x.ax = 2;
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int86(MOUSE_INTERRUPT, &in, &out);
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return GD_TRUE;
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}
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/**
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* gd_get_mouse_status(int *x, int *y, int *click)
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* Gets mouse position by X,Y and mouse button click status
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*/
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void gd_get_mouse_status(int *x, int *y, int *click) {
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union REGS in, out;
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in.x.ax = 3;
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int86(MOUSE_INTERRUPT, &in, &out);
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/**
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* Click is the integer variable which returns the values
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* 1 - Left mouse button
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* 2 - Right mouse button
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* 3 - Middle mouse button
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* 4 - ...
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*/
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*click = out.x.bx;
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*x = out.x.cx;
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*y = out.x.dx;
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}
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#endif
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