5 * (C)1993 Ztiff Zox Softwear
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7 * Simple graphics library to accompany the article
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9 * INTRODUCTION TO MODE X.
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11 * This library provides the basic functions for initializing and using
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12 * unchained (planar) 256-color VGA modes. Currently supported are:
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17 * Functions are provided for:
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19 * - initializing one of the available modes
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20 * - setting the start address of the VGA refresh data
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21 * - setting active and visible display pages
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22 * - writing and reading a single pixel to/from video memory
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24 * The library is provided as a demonstration only, and is not claimed
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25 * to be particularly efficient or suited for any purpose. It has only
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26 * been tested with Borland C++ 3.1 by the author. Comments on success
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27 * or disaster with other compilers are welcome.
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29 * This file is public domain. Do with it whatever you'd like, but
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30 * please don't distribute it without the article.
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32 * Thanks go out to various helpful netters who spotted the 0xE7 bug
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33 * in the set320x240x256() function!
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35 * Modified by sparky4 so it can be compiled in open watcom ^^
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42 * We 'require' a large data model simply to get rid of explicit 'far'
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43 * pointers and compiler specific '_fmemset()' functions and the likes.
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45 #if !defined(__COMPACT__)
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46 # if !defined(__LARGE__)
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47 # if !defined(__HUGE__)
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48 # error Large data model required! Try compiling with 'wcc -0 -ml lib.c'.
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57 //code from old library!
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59 #include "dos_gfx.h"
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62 //color
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66 int bakax = 0, bakay = 0;
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67 cord xx = rand()&0%320, yy = rand()&0%240, sx = 0, sy = 0;
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71 * Comment out the following #define if you don't want the testing main()
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77 * Define the port addresses of some VGA registers.
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79 #define CRTC_ADDR 0x3d4 /* Base port of the CRT Controller (color) */
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81 #define SEQU_ADDR 0x3c4 /* Base port of the Sequencer */
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82 #define GRAC_ADDR 0x3ce /* Base port of the Graphics Controller */
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83 #define STATUS_ADDR 0x3DA
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85 unsigned char *RowsX[600];
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86 unsigned char write_plane, read_plane;
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87 unsigned short text_mask[16] = { 0x0002, 0x0102, 0x0202, 0x0302,
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88 0x0402, 0x0502, 0x0602, 0x0702,
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89 0x0802, 0x0902, 0x0A02, 0x0B02,
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90 0x0C02, 0x0D02, 0x0E02, 0x0F02 };
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94 * Make a far pointer to the VGA graphics buffer segment. Your compiler
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95 * might not have the MK_FP macro, but you'll figure something out.
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97 byte *vga = (byte *) MK_FP(0xA000, 0);
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101 * width and height should specify the mode dimensions. widthBytes
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102 * specify the width of a line in addressable bytes.
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104 unsigned width, height, widthBytes;
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107 * actStart specifies the start of the page being accessed by
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108 * drawing operations. visStart specifies the contents of the Screen
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109 * Start register, i.e. the start of the visible page.
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111 unsigned actStart, visStart;
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114 * set320x200x256_X()
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115 * sets mode 13h, then turns it into an unchained (planar), 4-page
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116 * 320x200x256 mode.
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118 void set320x200x256_X(void)
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122 /* Set VGA BIOS mode 13h: */
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124 int86(0x10, &r, &r);
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126 /* Turn off the Chain-4 bit (bit 3 at index 4, port 0x3c4): */
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127 outpw(SEQU_ADDR, 0x0604);
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129 /* Turn off word mode, by setting the Mode Control register
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130 of the CRT Controller (index 0x17, port 0x3d4): */
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131 outpw(CRTC_ADDR, 0xE317);
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133 /* Turn off doubleword mode, by setting the Underline Location
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134 register (index 0x14, port 0x3d4): */
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135 outpw(CRTC_ADDR, 0x0014);
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137 /* Clear entire video memory, by selecting all four planes, then
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138 writing 0 to entire segment. */
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139 outpw(SEQU_ADDR, 0x0F02);
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140 memset(vga+1, 0, 0xffff); /* stupid size_t exactly 1 too small */
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143 /* Update the global variables to reflect dimensions of this
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144 mode. This is needed by most future drawing operations. */
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148 /* Each byte addresses four pixels, so the width of a scan line
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149 in *bytes* is one fourth of the number of pixels on a line. */
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150 widthBytes = width / 4;
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152 /* By default we want screen refreshing and drawing operations
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153 to be based at offset 0 in the video segment. */
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154 actStart = visStart = 0;
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157 --------------------
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158 HORIZONTAL SCROLLING
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159 --------------------
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160 Horizontal scrolling is essentially the same as vertical scrolling, all
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161 you do is increment or decrement the VGA offset register by 1 instead of
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162 80 as with vertical scrolling.
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164 However, horizontal scrolling is complicated by two things
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166 1. Incrementing the offset register by one actually scrolls by FOUR
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167 pixels (and there are FOUR planes on the VGA, what a coincidence)
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169 2. You can't draw the image off the screen and then scroll it on
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170 because of the way the VGA wraps to the next row every 80 bytes
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171 (80 bytes * 4 planes = 320 pixels), if you tried it, you would
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172 actually be drawing to the other side of the screen (which is
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175 I'll solve these problems one at a time.
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177 Firstly, to get the VGA to scroll by only one pixel you use the horizontal
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178 pixel panning (HPP) register. This register resides at
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183 and in real life, you use it like this
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185 ----------------- Pixel Panning ---------------
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186 IN PORT 3DAH (this clears an internal
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187 flip-flop of the VGA)
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188 OUT 13H TO PORT 3C0H
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189 OUT value TO PORT 3C0H (where "value" is the
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190 number of pixels to offset)
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191 -----------------------------------------------
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194 mxSetVirtualScreen(480,360);
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198 * setActiveStart() tells our graphics operations which address in video
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199 * memory should be considered the top left corner.
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201 void setActiveStart(unsigned offset)
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207 * setVisibleStart() tells the VGA from which byte to fetch the first
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208 * pixel when starting refresh at the top of the screen. This version
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209 * won't look very well in time critical situations (games for
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210 * instance) as the register outputs are not synchronized with the
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211 * screen refresh. This refresh might start when the high byte is
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212 * set, but before the low byte is set, which produces a bad flicker.
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214 void setVisibleStart(unsigned offset)
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217 outpw(CRTC_ADDR, 0x0C); /* set high byte */
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218 outpw(CRTC_ADDR+1, visStart >> 8);
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219 outpw(CRTC_ADDR, 0x0D); /* set low byte */
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220 outpw(CRTC_ADDR+1, visStart & 0xff);
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224 * setXXXPage() sets the specified page by multiplying the page number
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225 * with the size of one page at the current resolution, then handing the
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226 * resulting offset value over to the corresponding setXXXStart()
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227 * function. The first page is number 0.
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229 void setActivePage(int page)
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231 setActiveStart(page * widthBytes * height);
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234 void setVisiblePage(int page)
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236 setVisibleStart(page * widthBytes * height);
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239 void putPixel_X(int x, int y, byte color)
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241 /* Each address accesses four neighboring pixels, so set
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242 Write Plane Enable according to which pixel we want
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243 to modify. The plane is determined by the two least
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244 significant bits of the x-coordinate: */
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246 outp(0x3c5, 0x01 << (x & 3));
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248 /* The offset of the pixel into the video segment is
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249 offset = (width * y + x) / 4, and write the given
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250 color to the plane we selected above. Heed the active
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251 page start selection. */
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252 vga[(unsigned)(widthBytes * y) + (x / 4) + actStart] = color;
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256 byte getPixel_X(int x, int y)
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258 /* Select the plane from which we must read the pixel color: */
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259 outpw(GRAC_ADDR, 0x04);
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260 outpw(GRAC_ADDR+1, x & 3);
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262 return vga[(unsigned)(widthBytes * y) + (x / 4) + actStart];
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266 void set320x240x256_X(void)
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268 /* Set the unchained version of mode 13h: */
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269 set320x200x256_X();
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271 /* Modify the vertical sync polarity bits in the Misc. Output
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272 Register to achieve square aspect ratio: */
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275 /* Modify the vertical timing registers to reflect the increased
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276 vertical resolution, and to center the image as good as
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278 outpw(0x3D4, 0x2C11); /* turn off write protect */
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279 outpw(0x3D4, 0x0D06); /* vertical total */
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280 outpw(0x3D4, 0x3E07); /* overflow register */
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281 outpw(0x3D4, 0xEA10); /* vertical retrace start */
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282 outpw(0x3D4, 0xAC11); /* vertical retrace end AND wr.prot */
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283 outpw(0x3D4, 0xDF12); /* vertical display enable end */
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284 outpw(0x3D4, 0xE715); /* start vertical blanking */
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285 outpw(0x3D4, 0x0616); /* end vertical blanking */
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287 /* Update mode info, so future operations are aware of the
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294 /*-----------XXXX-------------*/
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296 /////////////////////////////////////////////////////////////////////////////
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298 // WaitRetrace() - This waits until you are in a Verticle Retrace. //
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300 /////////////////////////////////////////////////////////////////////////////
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301 void wait_for_retrace(void)
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303 while (!(inp(STATUS_ADDR) & 0x08));
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306 /////////////////////////////////////////////////////////////////////////////
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308 // MoveTo() - This moves to position X*4 on a chain 4 screen. //
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309 // Note: As soon as I find documentation, this function //
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310 // will be better documented. - Snowman //
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312 /////////////////////////////////////////////////////////////////////////////
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314 void MoveTo (word X, word Y) {
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316 // word O = Y*SIZE*2+X;
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317 word O = Y*widthBytes*2+X;
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333 ;-----------------------------------------------------------
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335 ; MXPN.ASM - Panning function
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336 ; Copyright (c) 1993,1994 by Alessandro Scotti
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338 ;-----------------------------------------------------------
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342 #pragma aux mxPan = \
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344 EXTRN mxWaitDisplay : FAR
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345 EXTRN mxStartAddress : FAR
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347 MX_TEXT SEGMENT USE16 PARA PUBLIC 'CODE'
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348 ASSUME cs:MX_TEXT, ds:NOTHING, es:NOTHING
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350 EXTRN mx_BytesPerLine : WORD
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352 ;-----------------------------------------------------------
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354 ; Moves the screen.
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357 ; X, Y = new X, Y coordinates of view screen
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368 mul [mx_BytesPerLine]
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373 push ax ; Push the start address
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375 call mxStartAddress
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377 mov dx, 03DAh ; Set the pixel pan register
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382 mov al, BYTE PTR [X]
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401 int xpos,ypos,xdir,ydir;
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403 // for(loop1=1;loop1<=62;loop1++)
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404 //Pal ((char)loop1,(char)loop1,(char)0,(char)(62-loop1)); // { This sets up the pallette for the pic }
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406 moveto(0,0,Size); // { This moves the view to the top left hand corner }
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408 // for(loop1=0;loop1<=3;loop1++)
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409 // for(loop2=0;loop2<=5;loop2++)
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410 // Putpic (loop1*160,loop2*66); // { This places the picture all over the
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411 // chain-4 screen }
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414 // xpos=rand (78)+1;
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415 // ypos=rand (198)+1; // { Random start positions for the view }
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422 WaitRetrace(); // { Take this out and watch the screen go crazy! }
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423 moveto (xpos,ypos,Size);
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426 if( (xpos>79) || (xpos<1))xdir=-xdir;
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427 if( (ypos>199) || (ypos<1))ydir=-ydir; // { Hit a boundry, change
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429 // if(_bios_keybrd(_KEYBRD_READY))ch=getch();
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430 // if(ch==0x71)break; // 'q'
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431 // if(ch==0x1b)break; // 'ESC'
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436 //king_crimson's code
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437 void putColorBox_X(int x, int y, int w, int h, byte color) {
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442 for (curx=x; curx<(x+w); curx++) {
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443 outp(0x3c5, 0x01 << (curx & 3));
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444 drawptr = (unsigned)(widthBytes * y) + (curx / 4) + actStart;
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445 for (cury=0; cury<h; cury++) {
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446 vga[drawptr] = color;
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447 drawptr += widthBytes;
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452 void vScroll(int rows)
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454 // Scrolling = current start + (rows * bytes in a row)
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455 setVisibleStart(visStart + (rows * width));
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458 void scrolly(int bongy)
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466 for(int ti=0;ti<TILEWH;ti++)
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473 //king_crimson's code
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474 void hScroll(int Cols) {
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475 wait_for_retrace();
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477 outp(0x3C0, Cols & 3);
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479 outp(0x3D5, Cols >> 2);
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481 //setVisibleStart(visStart + (Cols * height));
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482 setVisibleStart(visStart + (Cols * width));
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485 /*To implement smooth horizontal scrolling, you would do the following:
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486 -------------- Horizontal Scrolling ------------
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487 FOR X = 0 TO 319 DO
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488 SET HPP TO ( X MOD 4 )
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489 SET VGA OFFSET TO ( X/4 )
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491 ------------------------------------------------
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493 Okay, no problem at all (although I think you might have to fiddle
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494 around with the HPP a bit to get it right...try different values and
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497 So, the next problem is with drawing the images off the screen where
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498 they aren't visible and then scrolling them on!!! As it turns out,
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499 there's yet ANOTHER register to accomplish this. This one's called the
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500 offset register (no, not the one I was talking about before, that one
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501 was actually the "start address" register) and it's at
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506 and here's how to use it
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508 -------------- Offset Register ---------------
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509 OUT 13H TO PORT 3D4H
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510 OUT value TO PORT 3D5H
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511 ----------------------------------------------
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513 Now, what my VGA reference says is that this register holds the number
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514 of bytes (not pixels) difference between the start address of each row.
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515 So, in X-mode it normally contains the value 80 (as we remember,
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516 80 bytes * 4 planes = 320 pixels). This register does not affect the
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517 VISIBLE width of the display, only the difference between addresses on
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520 When we scroll horizontally, we need a little bit of extra working space
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521 so we can draw off the edge of the screen.
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523 Perhaps a little diagram will clarify it. The following picture is of a
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524 standard X-mode addressing scheme with the OFFSET register set to 80.
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527 0 0 ========================
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535 199 15920 ========================
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537 and the next diagram is of a modified addressing scheme with the OFFSET
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538 register set to 82 (to give us 4 extra pixels on each side of the screen)
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541 0 0 ------========================------
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544 .. .. | N S [ VISIBLE ] N S |
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545 | O I [ SCREEN ] O I |
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549 199 16318 ------========================------
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553 As with vertical scrolling, however, you still have the problem of when
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554 you reach the bottom of page 4...and it's fixed in the same manner.
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556 I haven't actually managed to get infinite horizontal scrolling working,
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557 but the method I have just stated will give you a horizontal scrolling
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558 range of over 200 screens!!!! So if you need more (which is extremely
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559 unlikely), figure it out yourself.
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565 To do both horizontal and vertical scrolling, all you have to do is combine
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566 the two methods with a few little extras (it's always the way isn't it).
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568 You have to start off with the original screen on the current page and the
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569 next page as well. When you scroll horizontally, you have to draw the edge
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570 that's coming in to the screen to BOTH pages (that means you'll be drawing
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571 the incoming edge twice, once for each page). You do this so that when you
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572 have scrolled vertically down through a complete page, you can jump back
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573 to the first page and it will (hopefully) have an identical copy, and you
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574 can then continue scrolling again.
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576 I'm sorry about this being so confusing but it's a bit difficult to explain.
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580 int loadfontX(char *fname)
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584 fp = fopen(fname, "rb");
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589 fread(Xfont, 8, 256, fp);
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595 void putchX(cord x, cord y, char c, byte color)
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603 vga_ptr = RowsX[y << 3] + (x << 1) + actStart;
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606 font_ptr = Xfont + (c << 3);
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610 temp = *font_ptr++;
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611 outpw(SEQU_ADDR, text_mask[temp & 0x0F]);
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612 *vga_ptr++ = color;
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614 outpw(SEQU_ADDR, text_mask[temp >> 4]);
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615 *vga_ptr-- = color;
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616 vga_ptr += widthBytes;
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620 void putstringX(cord x, cord y, char *str, byte color)
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628 vga_ptr = RowsX[y << 3] + (x << 1) + actStart;
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631 skip = 2 - (widthBytes << 3);
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633 while (c = *str++) {
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634 font_ptr = Xfont + (c << 3);
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638 temp = *font_ptr++;
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639 outpw(SEQU_ADDR, text_mask[temp & 0x0F]);
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640 *vga_ptr++ = color;
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642 outpw(SEQU_ADDR, text_mask[temp >> 4]);
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643 *vga_ptr-- = color;
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644 vga_ptr += widthBytes;
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651 /////////////////////////////////////////////////////////////////////////////
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653 // setvideo() - This function Manages the video modes //
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655 /////////////////////////////////////////////////////////////////////////////
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656 void setvideo(/*byte mode, */int vq){
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657 union REGS in, out;
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659 if(!vq){ // deinit the video
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660 // change to the video mode we were in before we switched to mode 13h
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662 in.h.al = old_mode;
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663 int86(0x10, &in, &out);
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665 }else if(vq == 1){ // init the video
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666 // get old video mode
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668 int86(0x10, &in, &out);
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669 old_mode = out.h.al;
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672 set320x240x256_X();
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676 /////////////////////////////////////////////////////////////////////////////
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678 // cls() - This clears the screen to the specified color, on the VGA or on //
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679 // the Virtual screen. //
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681 /////////////////////////////////////////////////////////////////////////////
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682 void cls(byte color, byte *Where){
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683 _fmemset(Where, color, width*(height*17));
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686 //color
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688 if(gq < NUM_COLORS){
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695 //color
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698 //---- cls(gq, vaddr);
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705 //slow spectrum down
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709 //plotpixel(xx, yy, coor, vga);
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710 //ppf(sx, sy, coor, vga);
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711 putPixel_X(sx, sy, coor);
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712 //printf("%d %d %d %d\n", sx, sy, svq, coor);
\r
717 if(svq == 7) coor++;
\r
718 if(sy == height && svq == 8) coor = rand()%NUM_COLORS;
\r
723 /*-----------ding-------------*/
\r
730 if((height)<yy<(height*2)){
\r
734 if((height*2)<yy<(height*3)){
\r
740 //++++ if(q <= 4 && q!=2 && gq == BONK-1) coor = rand()%HGQ;
\r
744 ) && gq == BONK-1){
\r
745 if(coor < HGQ && coor < LGQ) coor = LGQ;
\r
749 bakax = rand()%3; bakay = rand()%3;
\r
753 if(q==8){ colorz(); return gq; }else
\r
754 if(q==10){ ssd(q); /*printf("%d\n", coor);*/ }else
\r
755 if(q==5){ colortest(); return gq; }else
\r
756 if(q==11){ colorz(); delay(100); return gq; }
\r
758 coor = rand()%NUM_COLORS;
\r
759 //---- cls(coor, vaddr);
\r
767 if(q == 9){ ssd(q); coor++; }
\r
771 if((q<5 && gq<BONK) || (q==16 && gq<BONK)){ // the number variable make the colors more noticable
\r
773 if(xx==width){bakax=0;}
\r
774 if(xx==0){bakax=1;}
\r
775 if(yy==height){bakay=0;}
\r
776 if(yy==0){bakay=1;}
\r
778 if(xx!=width||yy!=height){
\r
779 if(xx==0){bakax=1;bakay=-1;d3y=1;}
\r
780 if(yy==0){bakax=1;bakay=0;d3y=1;}
\r
781 if(xx==width){bakax=-1;bakay=-1;d3y=1;}
\r
782 if(yy==height){bakax=1;bakay=0;d3y=1;}
\r
783 }else if(xx==width&&yy==height) xx=yy=0;
\r
835 if(xx<(0/*-TILEWH*/)) xx=(width/*+TILEWH*/);
\r
836 if(yy<0) yy=(height*3);
\r
837 if(xx>(width/*+TILEWH*/)) xx=(0/*-TILEWH*/);
\r
838 if(yy>(height*3)) yy=0;
\r
841 //interesting effects
\r
847 putPixel_X(tx, ty, coor);
\r
848 //drawrect(tx, ty, tx+TILEWH, ty+TILEWH, coor);
\r
849 //printf("%d %d %d %d %d %d\n", xx, yy, tx, ty, TILEWH);
\r
852 //---- ppf(xx, yy, coor, vga);
\r
853 }else /*if(xx>=0 && xx<width && yy>=0 && yy<(height*3))*/{
\r
854 // putColorBox_X(xx, yy, TILEWH, TILEWH, coor);
\r
856 putPixel_X(xx, yy, coor);
\r
859 //---- if(q==2) ppf(rand()%, rand()%height, 0, vga);
\r
860 // if(q==2) putColorBox_X(rand()%width, rand()%(height*3), TILEWH, TILEWH, 0);
\r
862 if(q==2) putPixel_X(rand()%width, rand()%(height*3), 0);
\r
863 if(q==16) putPixel_X(rand()%width, rand()%(height*3), 0);
\r
864 if(q==2||q==4||q==16){ bakax = rand()%3; bakay = rand()%3; }
\r
866 //if(xx<0||xx>320||yy<0||yy>(height*3))
\r
867 // printf("%d %d %d %d %d %d\n", xx, yy, coor, bakax, bakay, getPixel_X(xx,yy));
\r
868 // printf("%d\n", getPixel_X(xx,yy));
\r
870 // drawText(0, 0, 15, getPixel_X(xx,yy));
\r
877 * The library testing routines follows below.
\r
888 int p, x, y, pages;
\r
890 /* This is the way to calculate the number of pages available. */
\r
891 pages = 65536L/(widthBytes*height); // apparently this takes the A000 address
\r
893 printf("%d\n", pages);
\r
895 for (p = 0; p <= pages; ++p)
\r
899 /* On each page draw a single colored border, and dump the palette
\r
900 onto a small square about the middle of the page. */
\r
903 for (x = 0; x <= width; ++x)
\r
905 putPixel_X(x, 0, p+1);
\r
906 if(p!=pages) putPixel_X(x, height-1, p+1);
\r
907 else putPixel_X(x, 99-1, p+1);
\r
910 for (y = 0; y <= height; ++y)
\r
912 putPixel_X(0, y, p+1);
\r
913 if(p!=pages) putPixel_X(width-1, y, p+1);
\r
914 else putPixel_X(width-1, y, p+1);
\r
917 for (x = 0; x < 16; ++x)
\r
918 for (y = 0; y < 16; ++y)
\r
919 putPixel_X(x+(p+2)*16, y+(p+2)*16, x + y*16);
\r
922 // drawText(0, 0, 15, p);
\r
926 /* Each pages will now contain a different image. Let the user cycle
\r
927 through all the pages by pressing a key. */
\r
928 for (p = 0; p <= pages; ++p)
\r
931 //drawText(0, 240, 15, "bakapi");
\r
938 * Library test (program) entry point.
\r
946 d=1; // switch variable
\r
947 key=4; // default screensaver number
\r
948 // puts("First, have a look at the 320x200 mode. I will draw some rubbish");
\r
949 // puts("on all of the four pages, then let you cycle through them by");
\r
950 // puts("hitting a key on each page.");
\r
951 // puts("Press a key when ready...");
\r
956 // puts("Then, check out Mode X, 320x240 with 3 (and a half) pages.");
\r
957 // puts("Press a key when ready...");
\r
962 /*temp = loadfontX("vga8x8.fnt");
\r
965 putstringX(0, 0, "bakapi!", 2);
\r
970 /*while(d!=0){ // on!
\r
971 if(!kbhit()){ // conditions of screen saver
\r
975 // user imput switch
\r
976 printf("Enter 1, 2, 3, 4, or 6 to run a screensaver, or enter 5 to quit.\n", getch()); // prompt the user
\r
978 //if(key==3){xx=yy=0;} // crazy screen saver wwww
\r
983 while(!kbhit()){ // conditions of screen saver
\r
986 //end of screen savers
\r
990 while(!kbhit()){ // conditions of screen saver
\r
1001 puts("Where to next? It's your move! wwww");
\r
1002 printf("bakapi ver. 1.04.09.03\nis made by sparky4
\81i
\81\86\83Ö
\81\85\81j feel free to use it ^^\nLicence: GPL v2\n");
\r