+/*\r
+ * LIB.C v1.2a\r
+ *\r
+ * by Robert Schmidt\r
+ * (C)1993 Ztiff Zox Softwear\r
+ *\r
+ * Simple graphics library to accompany the article\r
+ * \r
+ * INTRODUCTION TO MODE X.\r
+ * \r
+ * This library provides the basic functions for initializing and using\r
+ * unchained (planar) 256-color VGA modes. Currently supported are:\r
+ *\r
+ * - 320x200\r
+ * - 320x240\r
+ *\r
+ * Functions are provided for:\r
+ *\r
+ * - initializing one of the available modes\r
+ * - setting the start address of the VGA refresh data\r
+ * - setting active and visible display pages\r
+ * - writing and reading a single pixel to/from video memory\r
+ *\r
+ * The library is provided as a demonstration only, and is not claimed\r
+ * to be particularly efficient or suited for any purpose. It has only\r
+ * been tested with Borland C++ 3.1 by the author. Comments on success\r
+ * or disaster with other compilers are welcome.\r
+ *\r
+ * This file is public domain. Do with it whatever you'd like, but\r
+ * please don't distribute it without the article.\r
+ *\r
+ * Thanks go out to various helpful netters who spotted the 0xE7 bug\r
+ * in the set320x240x256() function!\r
+ *\r
+ * Modified by sparky4 so it can be compiled in open watcom ^^\r
+ */\r
+\r
+\r
+\r
+\r
+/*\r
+ * We 'require' a large data model simply to get rid of explicit 'far'\r
+ * pointers and compiler specific '_fmemset()' functions and the likes.\r
+ */\r
+#if !defined(__COMPACT__)\r
+# if !defined(__LARGE__)\r
+# if !defined(__HUGE__)\r
+# error Large data model required! Try compiling with 'wcc -0 -ml lib.c'.\r
+# endif\r
+# endif\r
+#endif\r
+\r
+#include <dos.h>\r
+#include <mem.h>\r
+#include <conio.h>\r
+\r
+//code from old library!\r
+/*src¥lib¥*/\r
+#include "dos_gfx.h"\r
+\r
+int old_mode;\r
+//color てすと\r
+int gq = LGQ;\r
+//てすと\r
+int q = 0;\r
+int bakax = 0, bakay = 0;\r
+cord xx = rand()&0%320, yy = rand()&0%240, sx = 0, sy = 0;\r
+byte coor;\r
+\r
+/*\r
+ * Comment out the following #define if you don't want the testing main()\r
+ * to be included.\r
+ */\r
+#define TESTING\r
+\r
+/*\r
+ * Define the port addresses of some VGA registers.\r
+ */\r
+#define CRTC_ADDR 0x3d4 /* Base port of the CRT Controller (color) */\r
+\r
+#define SEQU_ADDR 0x3c4 /* Base port of the Sequencer */\r
+#define GRAC_ADDR 0x3ce /* Base port of the Graphics Controller */\r
+#define STATUS_ADDR 0x3DA\r
+\r
+\r
+/*\r
+ * Make a far pointer to the VGA graphics buffer segment. Your compiler\r
+ * might not have the MK_FP macro, but you'll figure something out.\r
+ */\r
+byte *vga = (byte *) MK_FP(0xA000, 0);\r
+\r
+\r
+/*\r
+ * width and height should specify the mode dimensions. widthBytes\r
+ * specify the width of a line in addressable bytes.\r
+ */\r
+unsigned width, height, widthBytes;\r
+\r
+/*\r
+ * actStart specifies the start of the page being accessed by\r
+ * drawing operations. visStart specifies the contents of the Screen\r
+ * Start register, i.e. the start of the visible page.\r
+ */\r
+unsigned actStart, visStart;\r
+\r
+/*\r
+ * set320x200x256_X()\r
+ * sets mode 13h, then turns it into an unchained (planar), 4-page\r
+ * 320x200x256 mode.\r
+ */\r
+void set320x200x256_X(void)\r
+ {\r
+ union REGS r;\r
+\r
+ /* Set VGA BIOS mode 13h: */\r
+ r.x.ax = 0x0013;\r
+ int86(0x10, &r, &r);\r
+\r
+ /* Turn off the Chain-4 bit (bit 3 at index 4, port 0x3c4): */\r
+ outpw(SEQU_ADDR, 0x0604);\r
+\r
+ /* Turn off word mode, by setting the Mode Control register\r
+ of the CRT Controller (index 0x17, port 0x3d4): */\r
+ outpw(CRTC_ADDR, 0xE317);\r
+\r
+ /* Turn off doubleword mode, by setting the Underline Location\r
+ register (index 0x14, port 0x3d4): */\r
+ outpw(CRTC_ADDR, 0x0014);\r
+\r
+ /* Clear entire video memory, by selecting all four planes, then\r
+ writing 0 to entire segment. */\r
+ outpw(SEQU_ADDR, 0x0F02);\r
+ memset(vga+1, 0, 0xffff); /* stupid size_t exactly 1 too small */\r
+ vga[0] = 0;\r
+\r
+ /* Update the global variables to reflect dimensions of this\r
+ mode. This is needed by most future drawing operations. */\r
+ width = 320;\r
+ height = 200;\r
+\r
+ /* Each byte addresses four pixels, so the width of a scan line\r
+ in *bytes* is one fourth of the number of pixels on a line. */\r
+ widthBytes = width / 4;\r
+\r
+ /* By default we want screen refreshing and drawing operations\r
+ to be based at offset 0 in the video segment. */\r
+ actStart = visStart = 0;\r
+\r
+ }\r
+\r
+/*\r
+ * setActiveStart() tells our graphics operations which address in video\r
+ * memory should be considered the top left corner.\r
+ */\r
+void setActiveStart(unsigned offset)\r
+ {\r
+ actStart = offset;\r
+ }\r
+\r
+/*\r
+ * setVisibleStart() tells the VGA from which byte to fetch the first\r
+ * pixel when starting refresh at the top of the screen. This version\r
+ * won't look very well in time critical situations (games for\r
+ * instance) as the register outputs are not synchronized with the\r
+ * screen refresh. This refresh might start when the high byte is\r
+ * set, but before the low byte is set, which produces a bad flicker.\r
+ */\r
+void setVisibleStart(unsigned offset)\r
+ {\r
+ visStart = offset;\r
+ outpw(CRTC_ADDR, 0x0C); /* set high byte */\r
+ outpw(CRTC_ADDR+1, visStart >> 8);\r
+ outpw(CRTC_ADDR, 0x0D); /* set low byte */\r
+ outpw(CRTC_ADDR+1, visStart & 0xff);\r
+ }\r
+\r
+/*\r
+ * setXXXPage() sets the specified page by multiplying the page number\r
+ * with the size of one page at the current resolution, then handing the\r
+ * resulting offset value over to the corresponding setXXXStart()\r
+ * function. The first page is number 0.\r
+ */\r
+void setActivePage(int page)\r
+ {\r
+ setActiveStart(page * widthBytes * height);\r
+ }\r
+\r
+void setVisiblePage(int page)\r
+ {\r
+ setVisibleStart(page * widthBytes * height);\r
+ }\r
+\r
+void putPixel_X(int x, int y, byte color)\r
+ {\r
+ /* Each address accesses four neighboring pixels, so set\r
+ Write Plane Enable according to which pixel we want\r
+ to modify. The plane is determined by the two least\r
+ significant bits of the x-coordinate: */\r
+ outp(0x3c4, 0x02);\r
+ outp(0x3c5, 0x01 << (x & 3));\r
+\r
+ /* The offset of the pixel into the video segment is\r
+ offset = (width * y + x) / 4, and write the given\r
+ color to the plane we selected above. Heed the active\r
+ page start selection. */\r
+ vga[(unsigned)(widthBytes * y) + (x / 4) + actStart] = color;\r
+\r
+ }\r
+\r
+byte getPixel_X(int x, int y)\r
+ {\r
+ /* Select the plane from which we must read the pixel color: */\r
+ outpw(GRAC_ADDR, 0x04);\r
+ outpw(GRAC_ADDR+1, x & 3);\r
+\r
+ return vga[(unsigned)(widthBytes * y) + (x / 4) + actStart];\r
+\r
+ }\r
+\r
+void set320x240x256_X(void)\r
+ {\r
+ /* Set the unchained version of mode 13h: */\r
+ set320x200x256_X();\r
+\r
+ /* Modify the vertical sync polarity bits in the Misc. Output\r
+ Register to achieve square aspect ratio: */\r
+ outp(0x3C2, 0xE3);\r
+\r
+ /* Modify the vertical timing registers to reflect the increased\r
+ vertical resolution, and to center the image as good as\r
+ possible: */\r
+ outpw(0x3D4, 0x2C11); /* turn off write protect */\r
+ outpw(0x3D4, 0x0D06); /* vertical total */\r
+ outpw(0x3D4, 0x3E07); /* overflow register */\r
+ outpw(0x3D4, 0xEA10); /* vertical retrace start */\r
+ outpw(0x3D4, 0xAC11); /* vertical retrace end AND wr.prot */\r
+ outpw(0x3D4, 0xDF12); /* vertical display enable end */\r
+ outpw(0x3D4, 0xE715); /* start vertical blanking */\r
+ outpw(0x3D4, 0x0616); /* end vertical blanking */\r
+\r
+ /* Update mode info, so future operations are aware of the\r
+ resolution */\r
+ height = 240;\r
+\r
+ }
+
/*\r
* The library testing routines follows below.\r
*/\r
\r
/* This is the way to calculate the number of pages available. */\r
pages = 65536L/(widthBytes*height); // apparently this takes the A000 address\r
-// if(height==240) pages++;\r
-\r
-// printf("%d¥n", pages);\r
\r
for (p = 0; p <= pages; ++p)\r
{\r
//{\r
for (x = 0; x <= width; ++x)\r
{\r
-// putPixel_X(x, 0, p+1);\r
- mxPutPixel(x, 0, p+1);\r
- if(p!=pages) mxPutPixel(x, height-1, p+1);\r
- else if(height==240) mxPutPixel(x, 99-1, p+1);\r
+ putPixel_X(x, 0, p+1);\r
+ if(p!=pages) putPixel_X(x, height-1, p+1);\r
+ else if(height==240) putPixel_X(x, 99-1, p+1);\r
}\r
\r
for (y = 0; y <= height; ++y)\r
{\r
- mxPutPixel(0, y, p+1);\r
- if(p!=pages) mxPutPixel(width-1, y, p+1);\r
- else if(height==240) mxPutPixel(width-1, y, p+1);\r
+ putPixel_X(0, y, p+1);\r
+ if(p!=pages) putPixel_X(width-1, y, p+1);\r
+ else if(height==240) putPixel_X(width-1, y, p+1);\r
}\r
\r
for (x = 0; x < TILEWH; ++x)\r
for (y = 0; y < TILEWH; ++y)\r
- mxPutPixel(x+(p+2)*16, y+(p+2)*TILEWH, x + y*TILEWH);\r
+ putPixel_X(x+(p+2)*16, y+(p+2)*TILEWH, x + y*TILEWH);\r
//}\r
\r
}\r
\r
int main(void)\r
{\r
- int key,d,xpos,ypos,xdir,ydir;\r
+ int key,d;\r
//short int temp;\r
// main variables\r
d=1; // switch variable\r
key=4; // default screensaver number\r
- xpos=0;\r
- ypos=0;
- xdir=1;\r
- ydir=1;\r
// puts("First, have a look at the 320x200 mode. I will draw some rubbish");\r
// puts("on all of the four pages, then let you cycle through them by");\r
// puts("hitting a key on each page.");\r
// puts("Press a key when ready...");\r
// getch();\r
\r
-//++++0000\r
setvideo(1);\r
// screen savers\r
\r
ding(key);\r
}\r
//end of screen savers\r
- //doTest();\r
- for (int x = 0; x < width; ++x)\r
- {\r
- mxPutPixel(x, 0, 15);\r
- mxPutPixel(x, height-1, 15);\r
- }\r
- for (int y = 0; y < height; ++y)\r
- {\r
- mxPutPixel(0, y, 15);\r
- mxPutPixel(width-1, y, 15);\r
- }\r
- getch();\r
+ doTest();\r
while(!kbhit()){\r
-// hScroll(1);\r
-// scrolly(1);\r
-// vScroll(1);\r
-// delay(100);\r
- //for(int i=0;i<TILEWH;i++){\r
- ding(key);\r
- mxPan(xpos,ypos);\r
- mxWaitRetrace();\r
- xpos=xpos+xdir;\r
- ypos=ypos+ydir;\r
- if( (xpos>239) || (xpos<1))xdir=-xdir;\r
- if( (ypos>179) || (ypos<1))ydir=-ydir; // { Hit a boundry, change\r
- // direction! }\r
- //}\r
+\r
}\r
setvideo(0);\r
printf("wwww¥n%dx%d¥n", width,height);\r
projects / 16.git / blobdiff