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glgraph.c
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glgraph.c
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// vbase version...
#include <stdio.h>
#include <math.h>
#include <stdlib.h>
#include <sys/time.h>
#include <OpenGL/OpenGL.h> // for CG stuff
#include <GLUT/glut.h>
#include <unistd.h> // sleep()
#include <Carbon/Carbon.h> // for Delay(), ExitToShell()
//#include <QuickTime/QuickTime.h>
#include "glgraph.h"
#include "rstuff.h"
#if 0 // defined in Carbon.h
struct Rect {
short top;
short left;
short bottom;
short right;
};
typedef struct Rect Rect;
// does the same as above, except that "Rect" not entered in the structure namespace
typedef struct {
short top;
short left;
short bottom;
short right;
} Rect;
#endif
int gl_wind;
int gl_pen = 0;
int gl_fullscreen = 0;
float gl_xhold,gl_yhold,gl_zhold;
int gl_xsize=640,gl_ysize=480;
int gl_ix = 640, gl_iy = 480; // default screen size
int gl_left = 320, gl_top = 54; // default screen position
long gl_scrnsize,gl_mode,gl_dbl,gl_BPL,gl_SPL;
float gl_oleft=0,gl_oright=1,gl_obottom=0,gl_otop=1,gl_oznear= -1,gl_ozfar=1; // ortho() default
float gl_oxfact,gl_oyfact;
long gl_ixhold,gl_iyhold;
char *gl_DBPtr,*gl_DBPtr1=0,*gl_DBPtr2=0,*gl_DBmaxPtr,*gl_DBminPtr;
long gl_ixminclip,gl_ixmaxclip,gl_iyminclip,gl_iymaxclip;
long gl_iwx1,gl_iwx2,gl_iwy1,gl_iwy2;
unsigned long gl_color;
//struct gl_Pat
// {
// long rowl,nrows,rowbytes;
// char *data;
// };
gl_Pat gl_DestPat; // either the screen or an off-screen buffer
int gl_keys[512]; // for recording key presses
int gl_shift = 0;
int gl_ctl = 0;
int gl_opt = 0;
int gl_count = 10; // to enable single key presses
int gl_print = 0;
float gl_delt = .5; // adjust rate of parameter change
int gl_flip = 0; // mirror reversal flag
float gl_xpos=0,gl_ypos=0,gl_zpos=0;
float gl_xrot=0,gl_yrot=0,gl_zrot=0;
float gl_fovy=60; // field of view for gluPerspective()
float gl_zset; // z axis camera position
float gl_amp = -80;
long gl_lines = 79;
int gl_bwctl = 1;
int gl_overlay = 0;
long gl_sync = 0;
int gl_framecount = 0;
int gl_vframerate = 0; // video frame rate flag
int gl_timer = 0; // timer interval (msec)
struct timeval gl_tm,gl_tm1; // for fps calculations
int gl_imx,gl_imy; // raw mouse coordinates
int gl_butnum; // mouse button number
int gl_butstate; // mouse button state
float gl_mousex,gl_mousey; // scaled mouse coordinates (0, 1)
void printhelp();
typedef struct tagVideoWindow VideoWindow;
VideoWindow* videoNewWindow();
extern int firstex;
extern Rect vidRect;
extern void videoDisplay();
extern void initvid(int,int);
extern unsigned short Vout[SIZEX * SIZEY];
extern void *Vptr;
void initgraph(char *cname)
{
float theta,pi = 3.1416;
printhelp();
//initvid(SIZEX, SIZEY); // initialize digitizer
//initvid(352,288); // acceptable isight resolution setting
//initvid(0, 0); // sets vidRect to maximum available from digitizer
//gl_ix = vidRect.right; gl_iy = vidRect.bottom; // default is 640 x 480
glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGBA);
glutInitWindowSize(gl_ix, gl_iy);
glutInitWindowPosition(gl_left, gl_top);
gl_wind = glutCreateWindow(cname);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(gl_fovy, (float)gl_ix/(float)gl_iy, .1f, 10000.0f);
glScalef(1,-1,1);
theta = (gl_fovy / 360.0) * pi; // half angle
gl_zset = (.5 * gl_iy) / tan(theta);
glTranslatef(-gl_ix/2, -gl_iy/2 , -gl_zset); // window scaled to (gl_ix, gl_iy)
glShadeModel(GL_FLAT);
glClearColor(0.0f, 0.0f, 0.0f, 1.0f); // black window background
glutDisplayFunc (videoDisplay);
//glutIdleFunc(videoDisplay);
glutSetCursor(GLUT_CURSOR_NONE);
glutSetKeyRepeat(GLUT_KEY_REPEAT_OFF);
//glutReshapeFunc(ReSize);
glutKeyboardFunc(keyCB);
glutKeyboardUpFunc(keyUpCB);
glutSpecialFunc(&specialKeyPressed);
glutSpecialUpFunc(&specialKeyUp);
glutMouseFunc (clickCB);
glutMotionFunc (mouseCB);
//glutPassiveMotionFunc (mouseCB);
videoNewWindow(); // create texture, video-in destination, start video
// set graphics target here, 0 to malloc memory locally
gl_DBPtr1 = (char *)Vout; // user array
//gl_DBPtr1 = (char *)Vptr; // gworld memory
//gl_DBPtr1 = 0; // malloc
gl_BPL = 4 * gl_ix; // 4 bytes per pixel! (for this version)
gl_SPL = gl_BPL/4;
target(1); // set gl_DBPtr to gl_DBPtr1
gl_ixminclip = 0;
gl_ixmaxclip = gl_ix-1;
gl_iyminclip = 0;
gl_iymaxclip = gl_iy-1;
gl_DestPat.rowl = gl_ix;
gl_DestPat.nrows = gl_iy;
gl_DestPat.rowbytes = gl_BPL;
gl_DestPat.data = gl_DBPtr;
scale(0,1,0,1); // default scaling
wind(0,gl_ix-1,0,gl_iy-1);
}
void prefsize(long ix,long iy)
{
gl_ix=ix;
gl_iy=iy;
}
void prefposition(long ix,long iy)
{
gl_left=ix;
gl_top=iy;
}
void g_pendn()
{
if(!gl_pen)
{
glBegin(GL_LINE_STRIP);
glVertex3f(gl_xhold,gl_yhold,gl_zhold);
}
gl_pen = 1;
}
void g_penup()
{
glEnd();
gl_pen = 0;
}
void g_move(float x, float y)
{
if(gl_pen)
glVertex2f(x,y);
gl_xhold = x;
gl_yhold = y;
}
void g_move3(float x, float y, float z)
{
if(gl_pen)
glVertex3f(x,y,z);
gl_xhold = x;
gl_yhold = y;
gl_zhold = z;
}
void g_clear()
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
}
void g_color(long value)
{
switch(value)
{
case BLACK:
glColor3f(0,0,0);
break;
case WHITE:
glColor3f(1,1,1);
break;
case RED:
glColor3f(1,0,0);
break;
case GREEN:
glColor3f(0,1,0);
break;
case BLUE:
glColor3f(0,0,1);
break;
case YELLOW:
glColor3f(1,1,0);
break;
case MAGENTA:
glColor3f(1,0,1);
break;
case CYAN:
glColor3f(0,1,1);
break;
}
}
void g_backcolor(long value)
{
switch(value)
{
case BLACK:
glClearColor(0,0,0,0);
break;
case WHITE:
glClearColor(1,1,1,0);
break;
case RED:
glClearColor(1,0,0,0);
break;
case GREEN:
glClearColor(0,1,0,0);
break;
case BLUE:
glClearColor(0,0,1,0);
break;
case YELLOW:
glClearColor(1,1,0,0);
break;
case MAGENTA:
glClearColor(1,0,1,0);
break;
case CYAN:
glClearColor(1,0,1,0);
break;
}
}
void g_RGBcolor(float r,float g,float b)
{
glColor3f(r,g,b);
}
void g_RGBbackcolor(float r,float g,float b)
{
glClearColor(r,g,b,0);
}
void g_setgray(float a)
{
glColor3f(a,a,a);
}
void ReSize(int Width, int Height)
{
gl_xsize = Width;
gl_ysize = Height;
glViewport(0, 0, Width, Height);
printf("wwidth %d height %d\n",Width,Height);
//glMatrixMode(GL_PROJECTION);
//glLoadIdentity();
//glOrtho(gl_oleft, gl_oright, gl_obottom, gl_otop, gl_oznear, gl_ozfar);
//Display();
//printf("%d %d\n",gl_xsize,gl_ysize);
}
// original routines...
// scale into full screen
void scale(float xlo,float xhi,float ylo,float yhi)
{
float rr,ll,tt,bb,ixhi,ixlo,iyhi,iylo;
gl_oleft=xlo; gl_oright=xhi;
gl_obottom=ylo; gl_otop=yhi;
rr = gl_oright; ll = gl_oleft; tt = gl_otop; bb = gl_obottom;
//ixhi = gl_screenRect.right - 1; ixlo = gl_screenRect.left; // adjust for
//iyhi = gl_screenRect.bottom - 1; iylo = gl_screenRect.top; // mac coordinates
ixhi = gl_ix-1; ixlo = 0; // adjust for mac coordinates??
iyhi = gl_iy-1; iylo = 0; // (this seems to give exact pixel fits)
gl_oxfact = (ixhi-ixlo)/(rr-ll);
gl_oyfact = (iyhi-iylo)/(bb-tt);
}
// scale into window set by wind()
void wscale(float xlo,float xhi,float ylo,float yhi)
{
float ixhi,ixlo,iyhi,iylo;
ixhi = gl_iwx2; ixlo = gl_iwx1; // get window coords
iyhi = gl_iwy2; iylo = gl_iwy1; // set by wind()
gl_oxfact = (ixhi-ixlo)/(xhi-xlo);
gl_oyfact = (iyhi-iylo)/(ylo-yhi); // flip to video coords here
gl_oleft = xlo - gl_iwx1/gl_oxfact;
gl_oright = xhi - gl_iwx1/gl_oxfact;
gl_otop = yhi - gl_iwy1/gl_oyfact;
gl_obottom = ylo - gl_iwy1/gl_oyfact;
}
// in video coordinates
void wind(long ixlo,long ixhi,long iylo, long iyhi)
{
gl_iwx1 = ixlo;
gl_iwx2 = ixhi;
gl_iwy1 = iylo;
gl_iwy2 = iyhi;
}
/* 32 */
void color(long value)
{
unsigned long lval=0;
switch(value)
{
case BLACK:
lval = 0x00000000;
break;
case WHITE:
lval = 0x00ffffff;
break;
case RED:
lval = 0x00ff0000;
break;
case GREEN:
lval = 0x0000ff00;
break;
case BLUE:
lval = 0x000000ff;
break;
case YELLOW:
lval = 0x00ffff00; // R + G
break;
case MAGENTA:
lval = 0x00ff00ff; // R + B
break;
case CYAN:
lval = 0x0000ffff; // B + G
break;
default:
lval = value;
break;
}
gl_color = lval;
}
/* 32 */
long RGBcolor(float r,float g,float b)
{
long ir,ig,ib;
ir = 256 * r;
if(ir == 256) ir = 255;
ig = 256 * g;
if(ig == 256) ig = 255;
ib = 256 * b;
if(ib == 256) ib = 255;
ir &= 255;
ig &= 255;
ib &= 255;
gl_color = ir<<16 | ig<<8 | ib;
return(gl_color);
}
/* 32 */
void setrgbcolor(float r,float g,float b)
{
gl_color = RGBcolor(r,g,b);
}
/* 32 */
void setgray(float a)
{
gl_color = RGBcolor(a,a,a);
}
/* 32 */
long setcolor(long ir,long ig,long ib)
{
#if 0
if(ir >= 256) ir = 255;
if(ir < 0) ir = 0;
if(ig >= 256) ig = 255;
if(ig < 0) ig = 0;
if(ib >= 256) ib = 255;
if(ib < 0) ib = 0;
#endif
ir &= 255;
ig &= 255;
ib &= 255;
gl_color = ir<<16 | ig<<8 | ib;
return(gl_color);
}
void clear(void)
{
gl_setbuf(gl_DBPtr,gl_color);
}
/* 32 */
//#define macro_dotati(x,y) *(gl_DBPtr + y*gl_BPL + x) = gl_color
#if CLIP
#define macro_dotati(x,y) dotati(x,y)
#else
#define macro_dotati(x,y) *((long*)gl_DBPtr + y*gl_SPL + x) = gl_color
#endif
//#define macro_dotati(x,y) dotati(x,y)
/* bresenham line-drawing algorithm */
void bresh(long x1,long y1,long x2,long y2)
{
long dx,dy,d,ink1,ink2,x,y,oct;
if(x1>x2)
{
x=x1;x1=x2;x2=x;
y=y1;y1=y2;y2=y;
}
dx = x2 - x1;
dy = y2 - y1;
x = x1; y = y1;
macro_dotati(x,y);
/* octant dispatch table... */
if(y2>y1)
{
if(dx>dy)
oct=1;
else
oct=2;
}
else
{
if(dx>-dy)
oct=3;
else
oct=4;
}
switch(oct){
case(1):
d = (dy<<1) - dx;
ink1 = (dy<<1);
ink2 = ((dy-dx)<<1);
while(x<x2)
{
++x;
if(d <= 0 )
d += ink1;
else
{
d += ink2;
++y;
}
macro_dotati(x,y);
}
break;
case(3):
d = (-dy<<1) - dx;
ink1 = (-dy<<1);
ink2 = ((-dy-dx)<<1);
while(x<x2)
{
++x;
if(d <= 0 )
d += ink1;
else
{
d += ink2;
--y;
}
macro_dotati(x,y);
}
break;
case(2):
d = (dx<<1) - dy;
ink1 = (dx<<1);
ink2 = ((dx-dy)<<1);
while(y<y2)
{
++y;
if(d <= 0 )
d += ink1;
else
{
d += ink2;
++x;
}
macro_dotati(x,y);
}
break;
case(4):
d = (dx<<1) + dy;
ink1 = (dx<<1);
ink2 = ((dx+dy)<<1);
while(y>y2)
{
--y;
if(d <= 0 )
d += ink1;
else
{
d += ink2;
++x;
}
macro_dotati(x,y);
}
}
}
void dotati(long x,long y)
{
register long *lPtr;
if(x<gl_ixminclip)return;
if(x>gl_ixmaxclip)return;
if(y<gl_iyminclip)return;
if(y>gl_iymaxclip)return;
lPtr = (long *)gl_DBPtr + y*gl_SPL + x;
#if CLIP
if((lPtr>=(long*)gl_DBminPtr)&&(lPtr<(long*)gl_DBmaxPtr))
#endif
*lPtr = gl_color;
}
/* 32 */
void gl_scan(long x1,long x2,long y) // horizontal line-fill routine...
// fills x1 to x2 inclusive
{
register long *Ptr1,*Ptr2;
if(y<gl_iyminclip)return;
if(y>gl_iymaxclip)return;
if(x2<gl_ixminclip)return;
if(x1>gl_ixmaxclip)return;
if(x2-x1 < 0) return;
if(x1<gl_ixminclip) x1 = gl_ixminclip;
if(x2>gl_ixmaxclip) x2 = gl_ixmaxclip;
Ptr1 = (long *)gl_DBPtr + y*gl_SPL + x1;
Ptr2 = (long *)gl_DBPtr + y*gl_SPL + x2;
while(Ptr1 <= Ptr2) // whole-word writes
*Ptr1++ = gl_color;
}
/* bresenham circle drawing routine */
/* ..see foley and van dam, pg 87 */
#define dfn dotati
#define cpts(x, y)\
dfn(x+x0,y+y0);dfn(y+x0,x+y0);dfn(-x+x0,y+y0);dfn(y+x0,-x+y0);\
dfn(x+x0,-y+y0);dfn(-y+x0,x+y0);dfn(-x+x0,-y+y0);dfn(-y+x0,-x+y0)
void brcirc(long x0,long y0,long rad)
{
long x,y,d,ink1,ink2;
x=0;
y=rad;
d=1-rad;
ink1=3;
ink2=5-(rad<<1);
cpts(x,y);
while(y>x)
{
++x;
ink1+=2;
if(d<0)
{
d+=ink1;
ink2+=2;
}
else
{
d+=ink2;
ink2+=4;
--y;
}
cpts(x,y);
}
}
/* bresenham filled circle drawing routine */
void brcircf(long x0,long y0,long rad)
{
long x,y,d,ink1,ink2;
x=0;
y=rad;
d=1-rad;
ink1=3;
ink2=5-(rad<<1);
while(y>x)
{
ink1+=2;
if(d<0)
{
d+=ink1;
ink2+=2;
}
else
{
d+=ink2;
ink2+=4;
gl_scan(x0-x,x0+x,y0+y);
gl_scan(x0-x,x0+x,y0-y);
--y;
}
gl_scan(x0-y,x0+y,y0-x);
gl_scan(x0-y,x0+y,y0+x);
++x;
}
gl_scan(x0-x,x0+x,y0+y);
gl_scan(x0-x,x0+x,y0-y);
}
void circ(float x,float y,float rad) // floating point circle routine, radius in x-scaled units...
//float x,y,rad;
{
long ix,iy,irad;
x -= gl_oleft;
x *= gl_oxfact;
ix=x;
y -= gl_otop;
y *= gl_oyfact;
iy=y;
rad *= gl_oxfact;
irad=rad;
brcirc(ix,iy,irad);
//printf("x %f y %f\n",x,y);
//printf("ix %d iy %d\n",ix,iy);
}
void circf(float x,float y,float rad) // floating point filled circle routine, radius in x-scaled units...
{
long ix,iy,irad;
x -= gl_oleft;
x *= gl_oxfact;
ix=x;
y -= gl_otop;
y *= gl_oyfact;
iy=y;
rad *= gl_oxfact;
irad=rad;
brcircf(ix,iy,irad);
}
/* bresenham ellipse drawing routine */
/* ..see foley and van dam, pg 90 */
#define epts(x, y)\
dfn(x+x0,y+y0);dfn(-x+x0,y+y0);dfn(x+x0,-y+y0);dfn(-x+x0,-y+y0)
void brellip(long x0,long y0,long a, long b)
{
long x,y;
double d1,d2;
x=0;
y=b;
d1 = b*b - a*a*b + .25*a*a;
epts(x,y);
while(a*a*(y-.5) > b*b*(x+1))
{
if(d1 < 0)
d1 += b*b*(2*x+3);
else
{
d1 += b*b*(2*x+3) + a*a*(-2*y+2);
y--;
}
x++;
epts(x,y);
}
d2 = b*b*(x+.5)*(x+.5) + a*a*(y-1)*(y-1) - a*a*b*b;
while(y > 0)
{
if(d2 < 0)
{
d2 += b*b*(2*x+2) + a*a*(-2*y+3);
x++;
}
else
d2 += a*a*(-2*y+3);
y--;
epts(x,y);
}
}
/* bresenham ellipse drawing routine */
void brellipf(long x0,long y0,long a, long b)
{
long x,y;
double d1,d2;
x=0;
y=b;
d1 = b*b - a*a*b + .25*a*a;
//epts(x,y);
while(a*a*(y-.5) > b*b*(x+1))
{
if(d1 < 0)
d1 += b*b*(2*x+3);
else
{
d1 += b*b*(2*x+3) + a*a*(-2*y+2);
y--;
}
x++;
gl_scan(x0-x,x0+x,y0-y);
gl_scan(x0-x,x0+x,y0+y);
//epts(x,y);
}
d2 = b*b*(x+.5)*(x+.5) + a*a*(y-1)*(y-1) - a*a*b*b;
while(y > 0)
{
if(d2 < 0)
{
d2 += b*b*(2*x+2) + a*a*(-2*y+3);
x++;
}
else
d2 += a*a*(-2*y+3);
y--;
gl_scan(x0-x,x0+x,y0-y);
gl_scan(x0-x,x0+x,y0+y);
//epts(x,y);
}
}
void ellipse(float x,float y,float a,float b) // floating point ellipse routine
{
long ix,iy,ia,ib;
x -= gl_oleft;
x *= gl_oxfact;
ix=x;
y -= gl_otop;
y *= gl_oyfact;
iy=y;
a *= gl_oxfact;
b *= gl_oyfact;
ia=a; ib= -b;
brellip(ix,iy,ia,ib);
}
void ellipsef(float x,float y,float a,float b) // floating point filled ellipse routine
{
long ix,iy,ia,ib;
x -= gl_oleft;
x *= gl_oxfact;
ix=x;
y -= gl_otop;
y *= gl_oyfact;
iy=y;
a *= gl_oxfact;
b *= gl_oyfact;
ia=a; ib= -b;
brellipf(ix,iy,ia,ib);
}
void brect(long ix1,long iy1,long ix2,long iy2) // pixel units rectangle drawing routine
{
gl_scan(ix1,ix2,iy1);
gl_scan(ix1,ix2,iy2);
bresh(ix2,iy1,ix2,iy2);
bresh(ix1,iy1,ix1,iy2);
}
void brectf(long x1,long y1,long x2,long y2)
{
while(y1<=y2)
{
gl_scan(x1,x2,y1);
++y1;
}
}
void rect(float x1,float y1,float x2,float y2) // floating point rectangle drawing routine
{
long ix1,iy1,ix2,iy2,ihold;
x1 -= gl_oleft;
x1 *= gl_oxfact;
ix1=x1;
y1 -= gl_otop;
y1 *= gl_oyfact;
iy1=y1;
x2 -= gl_oleft;
x2 *= gl_oxfact;
ix2=x2;
y2 -= gl_otop;
y2 *= gl_oyfact;
iy2=y2;
if(ix1>ix2) {ihold=ix1;ix1=ix2;ix2=ihold;}
gl_scan(ix1,ix2,iy1);
gl_scan(ix1,ix2,iy2);
bresh(ix2,iy1,ix2,iy2);
bresh(ix1,iy1,ix1,iy2);
//printf("%d %d %d %d\n",ix1,iy1,ix2,iy2);
}
void rectf(float x1,float y1,float x2,float y2) // floating point rectangle fill routine
//float x1,y1,x2,y2;
{
long ix1,iy1,ix2,iy2,ihold;
x1 -= gl_oleft;
x1 *= gl_oxfact;
ix1=x1;
y1 -= gl_otop;
y1 *= gl_oyfact;
iy1=y1;
x2 -= gl_oleft;
x2 *= gl_oxfact;
ix2=x2;
y2 -= gl_otop;
y2 *= gl_oyfact;
iy2=y2;
if(ix1>ix2) {ihold=ix1;ix1=ix2;ix2=ihold;}
if(iy1>iy2) {ihold=iy1;iy1=iy2;iy2=ihold;}
#if TILERECTF
--ix2; --iy2;
#endif
//printf("%d %d %d %d wha?\n",ix1,iy1,ix2,iy2);
while(iy1<=iy2)
{
gl_scan(ix1,ix2,iy1);
++iy1;
}
}
/* set buffer to given long value... */
/* assumes gl_ix by gl_iy size */
/* 32 */
void gl_setbuf(char *Buf,long value)
{
register unsigned long i,icnt,lval;
unsigned long L[2];
register double *Bptr,fval;
lval = value; // make 2 copies
L[0] = lval; L[1] = lval;
fval = *((double *)L);
//icnt = (gl_ix*gl_iy)>>2; // 4 shorts to a double
icnt = (gl_BPL*gl_iy)>>3; // 8 bytes to a double
//printf("gl_BPL %d\n",gl_BPL);
Bptr = (double*)Buf;
for(i=0;i<icnt;i++)
{
*Bptr = fval;
++Bptr;
}
}
/* copy one buffer to another... */
/* assumes both are gl_ix by gl_iy size */
/* 32 */
void gl_copybuf(char *Buf1,char *Buf2)
{
register unsigned long i,icnt;
register double *Bptr1,*Bptr2;
//icnt = (gl_ix*gl_iy)>>2; // 4 shorts to a double
icnt = (gl_BPL*gl_iy)>>3; // 8 bytes to a double
Bptr1 = (double*)Buf1;
Bptr2 = (double*)Buf2;
for(i=0;i<icnt;i++)
{
*Bptr2++ = *Bptr1++;
}
}
/* copy one buffer to another, with mirror reversal */
/* assumes both are gl_ix by gl_iy size */
/* 32 */
void gl_copybufr(char *Buf1,char *Buf2)
{
register unsigned long i,j;
register long *Bptr1,*Bptr2;
Bptr2 = (long*)Buf2;
for(i=0;i<gl_iy;i++)
{
Bptr1 = (long*)Buf1;
Bptr1 += (i+1) * (gl_BPL>>2) - 1;
for(j=0;j< (gl_BPL>>2) ;j++)
*Bptr2++ = *Bptr1--;
}
}
/* copy via buffer number, at the moment */
/* we're implementing just two buffers... */
void copy(long srcnum,long dstnum)
{
char *Buf1=0,*Buf2=0;
if(srcnum == 1)
Buf1 = gl_DBPtr1;
if(srcnum == 2)
Buf1 = gl_DBPtr2;
if(dstnum == 1)
Buf2 = gl_DBPtr1;
if(dstnum == 2)
Buf2 = gl_DBPtr2;
gl_copybuf(Buf1,Buf2);
}
/* copy via buffer number, with a mask. pixels from */
/* the source which are equal to the mask aren't copied. */
/* at the moment we're implementing just two buffers */
void copymask(long srcnum,long dstnum,unsigned long mask)
{
register unsigned long i,icnt,val;
register unsigned long *Bptr1=0,*Bptr2=0;
if(srcnum == 1)
Bptr1 = (unsigned long*)gl_DBPtr1;
if(srcnum == 2)
Bptr1 = (unsigned long*)gl_DBPtr2;
if(dstnum == 1)
Bptr2 = (unsigned long*)gl_DBPtr1;
if(dstnum == 2)
Bptr2 = (unsigned long*)gl_DBPtr2;
icnt = (gl_BPL*gl_iy)>>2; // 4 bytes to a long
for(i=0;i<icnt;i++)
{
val = *Bptr1++;
if(val != mask)
*Bptr2 = val;
Bptr2++;
}
}
/* sets "target", the destination of drawing calls */
/* 1 - background #1, 2 - background #2 */
void target(long bufnum)
{