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Graphics Programming Black Book (Special Edition)
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disk1
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chapter52
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l52-1.c
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C/C++ Source or Header
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1997-06-18
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77 lines
/* 3D animation program to rotate 12 cubes. Uses fixed point.
Tested with Borland C++ 4.02 in small model by Jim Mischel 12/16/94.
*/
#include <conio.h>
#include <dos.h>
#include "polygon.h"
/* Base offset of page to which to draw */
unsigned int CurrentPageBase = 0;
/* Clip rectangle; clips to the screen */
int ClipMinX = 0, ClipMinY = 0;
int ClipMaxX = SCREEN_WIDTH, ClipMaxY = SCREEN_HEIGHT;
static unsigned int PageStartOffsets[2] =
{PAGE0_START_OFFSET,PAGE1_START_OFFSET};
int DisplayedPage, NonDisplayedPage;
int RecalcAllXforms = 1, NumObjects = 0;
Xform WorldViewXform; /* initialized from floats */
/* Pointers to objects */
Object *ObjectList[MAX_OBJECTS];
void main() {
int Done = 0, i;
Object *ObjectPtr;
union REGS regset;
InitializeFixedPoint(); /* set up fixed-point data */
InitializeCubes(); /* set up cubes and add them to object list; other
objects would be initialized now, if there were any */
Set320x240Mode(); /* set the screen to mode X */
ShowPage(PageStartOffsets[DisplayedPage = 0]);
/* Keep transforming the cube, drawing it to the undisplayed page,
and flipping the page to show it */
do {
/* For each object, regenerate viewing info, if necessary */
for (i=0; i<NumObjects; i++) {
if ((ObjectPtr = ObjectList[i])->RecalcXform ||
RecalcAllXforms) {
ObjectPtr->RecalcFunc(ObjectPtr);
ObjectPtr->RecalcXform = 0;
}
}
RecalcAllXforms = 0;
CurrentPageBase = /* select other page for drawing to */
PageStartOffsets[NonDisplayedPage = DisplayedPage ^ 1];
/* For each object, clear the portion of the non-displayed page
that was drawn to last time, then reset the erase extent */
for (i=0; i<NumObjects; i++) {
ObjectPtr = ObjectList[i];
FillRectangleX(ObjectPtr->EraseRect[NonDisplayedPage].Left,
ObjectPtr->EraseRect[NonDisplayedPage].Top,
ObjectPtr->EraseRect[NonDisplayedPage].Right,
ObjectPtr->EraseRect[NonDisplayedPage].Bottom,
CurrentPageBase, 0);
ObjectPtr->EraseRect[NonDisplayedPage].Left =
ObjectPtr->EraseRect[NonDisplayedPage].Top = 0x7FFF;
ObjectPtr->EraseRect[NonDisplayedPage].Right =
ObjectPtr->EraseRect[NonDisplayedPage].Bottom = 0;
}
/* Draw all objects */
for (i=0; i<NumObjects; i++)
ObjectList[i]->DrawFunc(ObjectList[i]);
/* Flip to display the page into which we just drew */
ShowPage(PageStartOffsets[DisplayedPage = NonDisplayedPage]);
/* Move and reorient each object */
for (i=0; i<NumObjects; i++)
ObjectList[i]->MoveFunc(ObjectList[i]);
if (kbhit())
if (getch() == 0x1B) Done = 1; /* Esc to exit */
} while (!Done);
/* Return to text mode and exit */
regset.x.ax = 0x0003; /* AL = 3 selects 80x25 text mode */
int86(0x10, ®set, ®set);
exit(1);
}