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GFX.C
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// gfx.c
#include "gfxlib.h"
#include "r3d.h"
#include <math.h>
void setpixel(int x, int y, uchar col) {
if(x>=0 && x<XRES && y>=0 && y<YRES)
video[y*XRES + x] = col;
}
int scanConvex(intVector vv[], int points, int clipedges[], uchar col) {
intVector v[3];
register int i;
int ok = 0;
memcpy(v,vv,sizeof(intVector));
if (points<3) return 0;
for (i=1; i<points-1; i++) {
memcpy(&(v[1]),&(vv[i]),sizeof(intVector)<<1);
ok += scan3(v, clipedges, col);
}
return (ok > 0);
}
int drawtpolyperspdivsubtri(intVector *tri, Bitmap *bild, PREPCOL plusVal);
int drawtpolyperspsubtri(intVector *tri, Bitmap *bild, PREPCOL plusVal);
int scanConvex_tmap_perspective(intVector vv[], int points, int clipedges[], Bitmap *bild, PREPCOL plusVal) {
intVector v[3];
register int i,j;
int ok = 0;
int bTexRepOrg = bAllowRepeated3dTextures;
if (points < 3) return 0;
if (texture_offset_x != 0 || texture_offset_y != 0) {
bAllowRepeated3dTextures = 1;
for (i=0; i<points; i++) {
vv[i].tex_coord.x += texture_offset_x;
vv[i].tex_coord.y += texture_offset_y;
}
}
memcpy(v,vv,sizeof(intVector));
v[0].tex_coord.x *= (float)bild->xSize - 1;
v[0].tex_coord.y *= (float)bild->ySize - 1;
v[0].tex_coord.z = 1;
v[0].z += bild->projectionDistance;
if (v[0].z < MAGIC_NUMBER_TOO_CLOSE_FOR_PROJECTION) v[0].z = MAGIC_NUMBER_TOO_CLOSE_FOR_PROJECTION;
for (i=1; i<points-1; i++) {
memcpy(&(v[1]),&(vv[i]),sizeof(intVector)<<1);
for (j=1; j<3; j++) {
v[j].tex_coord.x *= (float)bild->xSize - 1;
v[j].tex_coord.y *= (float)bild->ySize - 1;
v[j].tex_coord.z = 1;
// adjust z values to what we actually divided with in perspective projection
v[j].z += bild->projectionDistance;
if (v[j].z < MAGIC_NUMBER_TOO_CLOSE_FOR_PROJECTION) v[j].z = MAGIC_NUMBER_TOO_CLOSE_FOR_PROJECTION;
}
// ok += drawtpolyperspdivsubtri(v, bild, plusVal); // works properly only with 256x256 textures
ok += drawtpolyperspsubtri(v, bild, plusVal);
}
bAllowRepeated3dTextures = bTexRepOrg;
return (ok > 0);
}
int scanConvex_tmap(intVector vv[], int points, int clipedges[], Bitmap *bild, PREPCOL plusVal, int bPerspectiveCorrected) {
intVector v[3];
register int i,j;
int ok = 0;
int bTexRepOrg = bAllowRepeated3dTextures;
if (points < 3) return 0;
if (bPerspectiveCorrected) {
return scanConvex_tmap_perspective(vv, points, clipedges, bild, plusVal);
}
if (texture_offset_x != 0 || texture_offset_y != 0) {
bAllowRepeated3dTextures = 1;
for (i=0; i<points; i++) {
vv[i].tex_coord.x += texture_offset_x;
vv[i].tex_coord.y += texture_offset_y;
}
}
memcpy(v,vv,sizeof(intVector));
v[0].tex_coord.x *= (float)bild->xSize - 1;
v[0].tex_coord.y *= (float)bild->ySize - 1;
v[0].tex_coord.z = 1;
for (i=1; i<points-1; i++) {
memcpy(&(v[1]),&(vv[i]),sizeof(intVector)<<1);
for (j=1; j<3; j++) {
v[j].tex_coord.x *= (float)bild->xSize - 1;
v[j].tex_coord.y *= (float)bild->ySize - 1;
v[j].tex_coord.z = 1;
}
ok += scan3_tmap(v, clipedges, bild,plusVal);
}
bAllowRepeated3dTextures = bTexRepOrg;
return (ok > 0);
}
int scanConvex_goraud(intVector vv[], int points, int clipedges[], int I[], int goraudType, PREPCOL plusVal, int divZ, int plusZ, int maxZ) {
intVector v[3];
int I2[3];
register int i;
int ok = 0;
memcpy(v,vv,sizeof(intVector));
memcpy(I2,I,sizeof(int));
if (points<3) return 0;
for (i=1; i<points-1; i++) {
memcpy(&(v[1]),&(vv[i]),sizeof(intVector)<<1);
memcpy(&(I2[1]),&(I[i]),sizeof(int)<<1);
ok += scan3_goraud(v, clipedges, I2, goraudType, plusVal, divZ, plusZ, maxZ);
}
return (ok > 0);
}
/*
scan3:
Fyller trianglar(polygoner med 3 koordinater).
Returnerar -1 om polygonen var korrupt, annars 1.
*/
int scan3(intVector vv[], int clipedges[], uchar col) {
register int ysweep,xx1,xx2,yyy;
register uchar *vid;
int i,MINy,MAXy,MIDy=0,yEND;
long int lut1,lut2,x1,x2;
intVector *cp;
cp=vv;
// Om alla koordinater har samma y-position, rita ej ut ngt.
if (cp[0].y==cp[1].y && cp[1].y==cp[2].y) return 0;
if (cp[0].y < 0 && cp[1].y < 0 && cp[2].y < 0) return 0;
if (cp[0].x < 0 && cp[1].x < 0 && cp[2].x < 0) return 0;
if (cp[0].y >= YRES && cp[1].y >= YRES && cp[2].y >= YRES) return 0;
if (cp[0].x >= XRES && cp[1].x >= XRES && cp[2].x >= XRES) return 0;
xx1=cp[0].x; yyy=cp[0].y;
// Om två(eller fler) punkter har samma x- och y-koordinat är triangeln korrupt.
for (i=1; i<3; i++)
if (cp[i].x==xx1 && cp[i].y==yyy)
return 0;
// Bestämning av punkt med minsta, mellersta och största y-v„rde.
MINy=0;
if (cp[1].y<cp[MINy].y) MINy=1;
if (cp[2].y<cp[MINy].y) MINy=2;
MAXy=0;
if (cp[1].y>cp[MAXy].y) MAXy=1;
if (cp[2].y>cp[MAXy].y) MAXy=2;
for (i=0; i<3; i++)
if(i!=MAXy && i!=MINy) MIDy=i;
// Här bestäms "linjernas" lutning. För att slippa flyttal "simuleras"
// dessa istället genom att vänsterskifta 16 steg.
ysweep=cp[MINy].y;
lut1=(cp[MIDy].x-cp[MINy].x)<<16; lut1/=(cp[MIDy].y-cp[MINy].y+1);
lut2=(cp[MAXy].x-cp[MINy].x)<<16; lut2/=(cp[MAXy].y-cp[MINy].y+1);
x1=x2=(cp[MINy].x)<<16;
vid=video+ysweep*XRES;
yEND=cp[MAXy].y;
if(yEND>YRES-1) yEND=YRES; //-1;
while(ysweep<yEND) { // Svep från Ymin till Ymax
x1+=lut1; x2+=lut2; // Lutning adderas till x-position.
if (ysweep==cp[MIDy].y) { // Skärning ("triangel 2" börjar här)
lut1=(cp[MAXy].x-cp[MIDy].x)<<16; lut1/=(cp[MAXy].y-cp[MIDy].y+1);
x1=(cp[MIDy].x)<<16;
x1+=lut1;
}
if (ysweep<0) goto esc;
xx1=x1>>16; xx2=x2>>16; // Här "skalas" x-värdet ned igen genom högerskift.
if (xx2<=xx1) {
if(xx1>=XRES) {
if(xx2>=XRES) goto esc; else xx1=XRES-1;
}
if(xx2<0) {
if(xx1<=0) goto esc; else xx2=0;
}
MYMEMSET(vid+xx2,col,xx1-xx2+1);
}
else {
if(xx2>=XRES) {
if(xx1>=XRES) goto esc; else xx2=XRES-1;
}
if(xx1<0) {
if(xx2<=0) goto esc; else xx1=0;
}
MYMEMSET(vid+xx1,col,xx2-xx1+1);
}
esc:
ysweep++;
vid+=XRES;
}
return 1;
}
/*
scan3_goraud:
Fyller trianglar(polygoner med 3 koordinater). Goraudshade.
Returnerar -1 om polygonen var korrupt, annars 1.
*/
int scan3_goraud(intVector vv[], int clipedges[], int I[], int goraudType, PREPCOL plusVal, int divZ, int plusZ, int maxZ) {
register int ysweep,xx1,xx2,yyy;
register uchar *vid;
int i,MINy,MAXy,MIDy=0,yEND,j;
long int lut1,lut2,x1,x2;
intVector *cp;
float shadla_diff,shadra_diff,shadr_diff,shadl_diff,diff_sx,diff_sxa=0;
float temp;
cp=vv;
if (goraudType == GORAUD_TYPE_Z) {
for (i=0; i<3; i++) {
I[i] = cp[i].z/divZ+plusZ+8;
if (I[i] < 8) I[i]=8;
if (I[i] > maxZ+8) I[i]=maxZ+8;
}
// I[2]++; // weird
}
// Om alla koordinater har samma y-position, rita ej ut ngt.
if (cp[0].y==cp[1].y && cp[1].y==cp[2].y) return 0;
if (cp[0].y < 0 && cp[1].y < 0 && cp[2].y < 0) return 0;
if (cp[0].x < 0 && cp[1].x < 0 && cp[2].x < 0) return 0;
if (cp[0].y >= YRES && cp[1].y >= YRES && cp[2].y >= YRES) return 0;
if (cp[0].x >= XRES && cp[1].x >= XRES && cp[2].x >= XRES) return 0;
xx1=cp[0].x; yyy=cp[0].y;
// Om två(eller fler) punkter har samma x- och y-koordinat är triangeln korrupt
for (i=1; i<3; i++)
if (cp[i].x==xx1 && cp[i].y==yyy)
return 0;
// Bestämning av punkt med minsta, mellersta och största y-värde.
MINy=0;
if (cp[1].y<cp[MINy].y) MINy=1;
if (cp[2].y<cp[MINy].y) MINy=2;
MAXy=0;
if (cp[1].y>cp[MAXy].y) MAXy=1;
if (cp[2].y>cp[MAXy].y) MAXy=2;
for (i=0; i<3; i++)
if(i!=MAXy && i!=MINy) MIDy=i;
// Här bestäms "linjernas" lutning. För att slippa flyttal "simuleras"
// dessa istället genom att vänsterskifta 16 steg.
ysweep=cp[MINy].y;
lut1=(cp[MIDy].x-cp[MINy].x)<<16;
lut1/=(cp[MIDy].y-cp[MINy].y+1);
lut2=(cp[MAXy].x-cp[MINy].x)<<16;
lut2/=(cp[MAXy].y-cp[MINy].y+1);
x1=x2=(cp[MINy].x)<<16;
shadla_diff=(I[MIDy]-I[MINy]+0.01)/(float)(cp[MIDy].y-cp[MINy].y+1); // 0.01 to avoid rounding/edge bug
shadra_diff=(I[MAXy]-I[MINy]+0.01)/(float)(cp[MAXy].y-cp[MINy].y+1);
shadl_diff=shadr_diff=I[MINy];
vid=video+ysweep*XRES;
yEND=cp[MAXy].y;
if(yEND>YRES-1) yEND=YRES;
while(ysweep<yEND) { // Svep från Ymin till Ymax
x1+=lut1; x2+=lut2; // Lutning adderas till x-position.
shadr_diff+=shadra_diff; shadl_diff+=shadla_diff;
if (ysweep==cp[MIDy].y) { // Skärning ("triangel 2" börjar här)
lut1=(cp[MAXy].x-cp[MIDy].x)<<16; // Ny lutning.
lut1/=(cp[MAXy].y-cp[MIDy].y+1);
x1=(cp[MIDy].x)<<16;
x1+=lut1;
shadla_diff=(I[MAXy]-I[MIDy]+0.01)/(float)(cp[MAXy].y-cp[MIDy].y+1);
shadl_diff=I[MIDy];
shadl_diff+=shadla_diff;
}
if (ysweep<0) goto skip;
xx1=x1>>16; xx2=x2>>16; // Här "skalas" x-värdet ned igen genom högerskift.
if (xx1>xx2) {
j=xx2; xx2=xx1; xx1=j;
diff_sx=shadr_diff; //+12; No ambient light
diff_sxa=-(shadr_diff-shadl_diff)/(float)(xx2-xx1);
if(xx2>=XRES) {
if(xx1>=XRES) goto skip; else xx2=XRES-1;
}
if(xx1<0) {
if(xx2<=0) goto skip; else { diff_sx+=diff_sxa*(-xx1); xx1=0; }
}
}
else {
diff_sx=shadl_diff; //+12; No ambient light
temp=xx2-xx1;
if(temp!=0)
diff_sxa=-(shadl_diff-shadr_diff)/temp;
if(xx2>=XRES) {
if(xx1>=XRES) goto skip; else xx2=XRES-1;
}
if(xx1<0) {
if(xx2<=0) goto skip; else { diff_sx+=diff_sxa*(-xx1); xx1=0; }
}
}
for (i=xx1; i<=xx2; i++) { // Rita ut pixlar mellan x-positioner.
vid[i]=(PREPCOL)diff_sx PLUSVAL_OP plusVal;
diff_sx+=diff_sxa; // Interpolera diffuse
}
skip:
ysweep++;
vid+=XRES;
}
return 1;
}
void fbox(uchar *inVid, int x, int y, int xrange, int yrange, uchar col) {
register uchar *vid;
register int i;
if (x>=XRES || y>=YRES) return;
if (x<0) { xrange+=x; x=0; }
if (y<0) { yrange+=y; y=0; }
if (x+xrange>=XRES) { xrange-=(x+xrange)-(XRES-1); }
if (y+yrange>=YRES) { yrange-=(y+yrange)-(YRES-1); }
if (xrange<0 || yrange<0) return;
vid=inVid+y*XRES+x;
for (i=0; i<=yrange; i++) {
MYMEMSET(vid, col, xrange+1);
vid+=XRES;
}
}
void box (int x, int y, int xrange, int yrange, uchar col) {
hline(x, x+xrange, y, col);
hline(x, x+xrange, y+yrange, col);
vline(x, y, y+yrange, col);
vline(x+xrange, y, y+yrange, col);
}
void circle(int xp, int yp, int radius, uchar col) {
register int d, x, xx, y, ye;
register uchar *vid=video+xp+yp*XRES;
ellipse(xp, yp, radius, radius, col); //too lazy to make clipping for this
return;
d = 3-(radius<<1);
x = xx = 0;
y = ye = radius;
y*=XRES;
repeat {
vid[x+y] = col;
vid[-x+y] = col;
vid[x-y] = col;
vid[-x-y] = col;
vid[ye+xx] = col;
vid[ye-xx] = col;
vid[-ye+xx] = col;
vid[-ye-xx] = col;
if (d < 0)
d=d+(x<<2) + 6;
else {
d=d+((x-ye)<<2) + 10;
y-=XRES; ye--;
}
x++; xx+=XRES;
} until (x>ye);
}
void ellipse(int xc, int yc, int rx, int ry, uchar col) {
register uchar *vid=video+xc+yc*XRES, *v1=video+FRAMESIZE;
register int x, y;
int T1,T2,T3,T4,T5,T6,T7,T8,T9;
int D1,D2;
int y1,y2;
if(rx < 0) rx=-rx;
if(ry < 0) ry=-ry;
T1=rx*rx;
T2=T1<<1;
T3=T1<<2;
T4=ry*ry;
T5=T4<<1;
T6=T4<<2;
T7=rx*T5;
T8=T7<<1;
T9=0;
D1=T2-T7+(T4>>1);
D2=(T1>>1)-T8+T5;
x=rx; y=0;
while (D2<0) {
y1=(vid+y-xc>=video && vid+y-xc<v1);
y2=(vid-y-xc>=video && vid-y-xc<v1);
if (x+xc>=0 && x+xc<XRES) {
if (y1) vid[x+y]=col;
if (y2) vid[x-y]=col;
}
if (xc-x>=0 && xc-x<XRES) {
if (y1) vid[-x+y]=col;
if (y2) vid[-x-y]=col;
}
y+=XRES;
T9+=T3;
if (D1<0) {
D1+=T9+T2;
D2+=T9;
}
else {
x--;
T8+=-T6;
D1+=T9+T2-T8;
D2+=T9+T5-T8;
}
}
repeat {
y1=(vid+y-xc>=video && vid+y-xc<v1);
y2=(vid-y-xc>=video && vid-y-xc<v1);
if (x+xc>=0 && x+xc<XRES) {
if (y1) vid[x+y]=col;
if (y2) vid[x-y]=col;
}
if (xc-x>=0 && xc-x<XRES) {
if (y1) vid[-x+y]=col;
if (y2) vid[-x-y]=col;
}
x--;
T8+=-T6;
if (D2<0) {
y+=XRES;
T9+=T3;
D2+=T9+T5-T8;
}
else
D2+=T5-T8;
} until (x<0);
}
void filled_ellipse(int xc, int yc, int rx, int ry, uchar col) {
register uchar *vid=video+xc+yc*XRES, *v1, *v2=video+FRAMESIZE;
register int x, y, xx, bx, dx;
int T1,T2,T3,T4,T5,T6,T7,T8,T9;
int D1,D2;
if(rx < 0) rx=-rx;
if(ry < 0) ry=-ry;
T1=rx*rx;
T2=T1<<1;
T3=T1<<2;
T4=ry*ry;
T5=T4<<1;
T6=T4<<2;
T7=rx*T5;
T8=T7<<1;
T9=0;
D1=T2-T7+(T4>>1);
D2=(T1>>1)-T8+T5;
x=rx; y=0;
while (D2<0) {
xx=x<<1; bx=xc-x; dx=x;
if (bx+xx>=XRES) { if (bx>=XRES) goto stop1; else xx-=(bx+xx)-XRES;}
if (bx<0) { if (bx+xx<0) goto stop1; else xx+=bx, dx=xc;}
v1=vid-dx-y;
if (v1>=video && v1<v2)
MYMEMSET(v1, col, xx);
v1=vid-dx+y;
if (v1>=video && v1<v2)
MYMEMSET(v1, col, xx);
stop1:
y+=XRES;
T9+=T3;
if (D1<0) {
D1+=T9+T2;
D2+=T9;
}
else {
x--;
T8+=-T6;
D1+=T9+T2-T8;
D2+=T9+T5-T8;
}
}
repeat {
xx=x<<1; bx=xc-x; dx=x;
if (bx+xx>=XRES) { if (bx>=XRES) goto stop2; else xx-=(bx+xx)-XRES;}
if (bx<0) { if (bx+xx<0) goto stop2; else xx+=bx, dx=xc;}
v1=vid-dx-y;
if (v1>=video && v1<v2)
MYMEMSET(v1, col, xx);
v1=vid-dx+y;
if (v1>=video && v1<v2)
MYMEMSET(v1, col, xx);
stop2:
x--;
T8+=-T6;
if (D2<0) {
y+=XRES;
T9+=T3;
D2+=T9+T5-T8;
}
else
D2+=T5-T8;
} until (x<0);
}
void filled_circle(int xc, int yc, int radius, uchar col) {
filled_ellipse(xc, yc, radius, radius, col);
}
/* Används av den generella polygonritar-rutinen.
Representerar en lutning och position mellan två punkter
*/
struct pline {
long int xpos,xlut;
int Yactive, Yinactive;
};
/* Compar:
Hjälpfunktion som används av systemfunktionen qsort i den generella
polygonritaren.
*/
static int compar(const void *vx, const void *vy) {
int *x = (int *)vx;
int *y = (int *)vy;
if (*x<*y) return -1;
return (*x>*y);
}
/* scanPoly:
Fyller polygoner av valfri typ(konvexa eller konkava) med 3 koordinater
eller fler.
Returnerar -1 om polygonen var korrupt, annars 1.
*/
int scanPoly(intVector p[],int points, uchar col, uchar bitOp) {
register int i,k,ysweep, x1, x2;
int MAXy,j,xes[5000];
struct pline linje[5000];
register uchar *vid;
int divVal;
int bitTemp,bitTemp2;
#ifdef _RGB32
int r,g,b;
long long r2,g2,b2;
#endif
if (points<3) return 0; // Returnera 0 om färre än 3 punkter(korrupt poly)
p[points].x=p[0].x; p[points].y=p[0].y; // Sista punkt=första punkt.
/* Bestäm lutning, inledande xpos och mellan vilka y-koordinater denna linje"
i polygonen är "aktiv". Görs mellan P1 och P2, P2 och P3... Pn-1 och Pn.
Flyttal "simuleras" genom vänsterskiftning för xlutning och xposition. */
for (i=0; i<points; i++) {
if (p[i].y<=p[i+1].y) { // Linjen går "uppåt"
linje[i].Yactive=p[i].y;
linje[i].Yinactive=p[i+1].y;
linje[i].xpos=p[i].x<<16;
linje[i].xlut=(p[i+1].x-p[i].x)<<16;
divVal = (p[i+1].y-p[i].y+1);
if (divVal == 0) return 0;
linje[i].xlut/=divVal;
}
else { // Linjen går "nedåt"
linje[i].Yactive=p[i+1].y;
linje[i].Yinactive=p[i].y;
linje[i].xpos=p[i+1].x<<16;
linje[i].xlut=(p[i].x-p[i+1].x)<<16;
divVal=(p[i].y-p[i+1].y+1);
if (divVal == 0) return 0;
linje[i].xlut/=divVal;
}
}
// Här bestäms start och slutposition i Y för polygonen.
ysweep=linje[0].Yactive;
for (i=0; i<points; i++)
if(linje[i].Yactive<ysweep)
ysweep=linje[i].Yactive;
MAXy=linje[0].Yinactive;
for (i=0; i<points; i++)
if(linje[i].Yinactive>MAXy)
MAXy=linje[i].Yinactive;
vid=video+ysweep*XRES;
if(MAXy>YRES) MAXy=YRES;
while(ysweep<MAXy) {
j=0;
/* Alla "linjer" som har en punkt på aktuell sveplinje får sin xposition
uppdaterad och läggs i array av xpositioner mellan vilka pixlar ritas */
for(i=0; i<points; i++) {
if(ysweep>=linje[i].Yactive && ysweep<linje[i].Yinactive) {
linje[i].xpos+=linje[i].xlut;
xes[j]=linje[i].xpos>>16;
j++;
}
}
if (ysweep < 0) goto dont;
qsort(xes,j,sizeof(int),compar); // Sortera xpositioner
for(i=0; i<j; i+=2) { // Rita pixlar mellan sorterade xpositioner.
x1=xes[i]; x2=xes[i+1];
if(x2>=XRES) {
if(x1>=XRES) continue; else x2=XRES-1;
}
if(x1<0) {
if(x2<=0) continue; else x1=0;
}
switch(bitOp) {
#ifdef _RGB32
case BIT_OP_ADD_FGRGB: for (k = x1; k < x1 + x2-x1+1; k++) { b = (((vid[k] & 0xff) + (col & 0xff)) ); g = ((((vid[k]>>8) & 0xff) + ((col >> 8) & 0xff)) ); r = ((((vid[k]>>16) & 0xff) + ((col >> 16) & 0xff)) ); if(b>255)b=255; if(g>255)g=255; if(r>255)r=255; vid[k] = b | (g<<8) | (r<<16) | (col & 0xffffff00000000); } break;
case BIT_OP_ADD_RGB: for (k = x1; k < x1 + x2-x1+1; k++) { b = (((vid[k] & 0xff) + (col & 0xff)) ); g = ((((vid[k]>>8) & 0xff) + ((col >> 8) & 0xff)) ); r = ((((vid[k]>>16) & 0xff) + ((col >> 16) & 0xff)) ); b2 = ((((vid[k]>>32) & 0xff) + ((col >> 32) & 0xff)) ); g2 = ((((vid[k]>>40) & 0xff) + ((col >> 40) & 0xff)) ); r2 = ((((vid[k]>>48) & 0xff) + ((col >> 48) & 0xff)) ); if(b>255)b=255; if(g>255)g=255; if(r>255)r=255;if(b2>255)b2=255; if(g2>255)g2=255; if(r2>255)r2=255; vid[k] = b | (g<<8) | (r<<16) | (b2<<32) | (g2<<40) | (r2<<48); } break;
case BIT_OP_SUB_FGRGB: for (k = x1; k < x1 + x2-x1+1; k++) { b = (((vid[k] & 0xff) - (col & 0xff)) ); g = ((((vid[k]>>8) & 0xff) - ((col >> 8) & 0xff)) ); r = ((((vid[k]>>16) & 0xff) - ((col >> 16) & 0xff)) ); if(b<0)b=0; if(g<0)g=0; if(r<0)r=0; vid[k] = b | (g<<8) | (r<<16) | (col & 0xffffff00000000); } break;
case BIT_OP_SUB_RGB: for (k = x1; k < x1 + x2-x1+1; k++) { b = (((vid[k] & 0xff) - (col & 0xff)) ); g = ((((vid[k]>>8) & 0xff) - ((col >> 8) & 0xff)) ); r = ((((vid[k]>>16) & 0xff) - ((col >> 16) & 0xff)) ); b2 = ((((vid[k]>>32) & 0xff) - ((col >> 32) & 0xff)) ); g2 = ((((vid[k]>>40) & 0xff) - ((col >> 40) & 0xff)) ); r2 = ((((vid[k]>>48) & 0xff) - ((col >> 48) & 0xff)) ); if(b<0)b=0; if(g<0)g=0; if(r<0)r=0;if(b2<0)b2=0; if(g2<0)g2=0; if(r2<0)r2=0; vid[k] = b | (g<<8) | (r<<16) | (b2<<32) | (g2<<40) | (r2<<48); } break;
case BIT_OP_BLEND_FGRGB: for (k = x1; k < x1 + x2-x1+1; k++) { int blNew, blOrg; blNew=(col >> 24) & 0xff; blOrg=255-blNew; b=((((vid[k] & 0xff) * blOrg / 256) + ((col & 0xff) * blNew / 256))); g=(((((vid[k]>>8) & 0xff) * blOrg / 256) + (((col>>8) & 0xff) * blNew / 256))); r=(((((vid[k]>>16) & 0xff) * blOrg / 256) + (((col>>16) & 0xff) * blNew / 256))); vid[k] = b | (g<<8) | (r<<16) | (col & 0xffffff00000000); } break;
case BIT_OP_BLEND_RGB: for (k = x1; k < x1 + x2-x1+1; k++) { int blNew, blOrg, bl2New, bl2Org; blNew=(col >> 24) & 0xff; blOrg=255-blNew; bl2New=(col >> 56) & 0xff; bl2Org=255-bl2New; b=((((vid[k] & 0xff) * blOrg / 256) + ((col & 0xff) * blNew / 256))); g=(((((vid[k]>>8) & 0xff) * blOrg / 256) + (((col>>8) & 0xff) * blNew / 256))); r=(((((vid[k]>>16) & 0xff) * blOrg / 256) + (((col>>16) & 0xff) * blNew / 256))); b2=(((((vid[k]>>32) & 0xff) * bl2Org / 256) + (((col>>32) & 0xff) * bl2New / 256))); g2=(((((vid[k]>>40) & 0xff) * bl2Org / 256) + (((col>>40) & 0xff) * bl2New / 256))); r2=(((((vid[k]>>48) & 0xff) * bl2Org / 256) + (((col>>48) & 0xff) * bl2New / 256))); vid[k] = b | (g<<8) | (r<<16) | (b2<<32) | (g2<<40) | (r2<<48); } break;
#endif
case BIT_OP_OR: for (k = x1; k < x1 + x2-x1+1; k++) vid[k] |= col; break;
case BIT_OP_AND: for (k = x1; k < x1 + x2-x1+1; k++) vid[k] &= col; break;
case BIT_OP_XOR: for (k = x1; k < x1 + x2-x1+1; k++) vid[k] ^= col; break;
case BIT_OP_ADD_REAL: for (k = x1; k < x1 + x2-x1+1; k++) { bitTemp = vid[k]; bitTemp+=col; if (bitTemp > 255) bitTemp = 255; vid[k] = bitTemp; } break;
case BIT_OP_SUB_REAL: for (k = x1; k < x1 + x2-x1+1; k++) { bitTemp = vid[k]; bitTemp-=col; if (bitTemp < 0) bitTemp = 0; vid[k] = bitTemp; } break;
case BIT_OP_SUB_ME_REAL: for (k = x1; k < x1 + x2-x1+1; k++) { bitTemp = col; bitTemp-=vid[k]; if (bitTemp < 0) bitTemp = 0; vid[k] = bitTemp; } break;
case BIT_OP_ADD: for (k = x1; k < x1 + x2-x1+1; k++) { bitTemp = vid[k]&0xf; bitTemp+=col&0xf; if (bitTemp > 15) bitTemp = 15; bitTemp2 = (vid[k]>>4)&0xf; bitTemp2+=(col>>4)&0xf; if (bitTemp2 > 15) bitTemp2 = 15; vid[k] = (bitTemp2 << 4) | bitTemp; } break;
case BIT_OP_SUB: for (k = x1; k < x1 + x2-x1+1; k++) { bitTemp = vid[k]&0xf; bitTemp-=col&0xf; if (bitTemp < 0) bitTemp = 0; bitTemp2 = (vid[k]>>4)&0xf; bitTemp2-=(col>>4)&0xf; if (bitTemp2 < 0) bitTemp2 = 0; vid[k] = (bitTemp2 << 4) | bitTemp; } break;
case BIT_OP_SUB_ME: for (k = x1; k < x1 + x2-x1+1; k++) { bitTemp = col&0xf; bitTemp-=vid[k]&0xf; if (bitTemp < 0) bitTemp = 0; bitTemp2 = (col>>4)&0xf; bitTemp2-=(vid[k]>>4)&0xf; if (bitTemp2 < 0) bitTemp2 = 0; vid[k] = (bitTemp2 << 4) | bitTemp; } break;
default: MYMEMSET(vid+x1,col,x2-x1+1);
}
}
dont:
ysweep++;
vid+=XRES;
}
return 1;
}
int line_clip(int *x1, int *y1, int *x2, int *y2) {
int xa=*x1, xb=*x2, ya=*y1, yb=*y2;
if ( (xa<0 && xb<0) || (ya<0 && yb<0) || (xa>=XRES && xb>=XRES) || (ya>=YRES && yb>=YRES) )
return 0;
if (xa < 0) {
if (xa-xb!=0)
ya += (float)(ya-yb)/(float)(xa-xb)*(float)(-xa);
xa = 0;
}
else if (xb < 0) {
if (xb-xa!=0)
yb += (float)(yb-ya)/(float)(xb-xa)*(float)(-xb);
xb = 0;
}
if (xa >= XRES) {
if (xa-xb!=0)
ya -= (float)(ya-yb)/(float)(xa-xb)*(float)(xa-(XRES-1));
xa = XRES-1;
}
else if (xb >= XRES) {
if (xb-xa!=0)
yb -= (float)(yb-ya)/(float)(xb-xa)*(float)(xb-(XRES-1));
xb = XRES-1;
}
if (ya < 0) {
if (ya-yb!=0)
xa += (float)(xa-xb)/(float)(ya-yb)*(float)(-ya);
ya = 0;
}
else if (yb < 0) {
if (yb-ya!=0)
xb += (float)(xb-xa)/(float)(yb-ya)*(float)(-yb);
yb = 0;
}
if (ya >= YRES) {
if (ya-yb!=0)
xa -= (float)(xa-xb)/(float)(ya-yb)*(float)(ya-(YRES-1));
ya = YRES-1;
}
else if (yb >= YRES) {
if (yb-ya!=0)
xb -= (float)(xb-xa)/(float)(yb-ya)*(float)(yb-(YRES-1));
yb = YRES-1;
}
if (ya<0) ya=0;
if (ya>=YRES) ya=YRES-1;
if (yb<0) yb=0;
if (yb>=YRES) yb=YRES-1;
if (xa<0) xa=0;
if (xa>=XRES) xa=XRES-1;
if (xb<0) xb=0;
if (xb>=XRES) xb=XRES-1;
*x1 = xa; *y1 = ya;
*x2 = xb; *y2 = yb;
return 1;
}
void line(int x1, int y1, int x2, int y2, uchar col, int clip) {
register uchar *vid;
int delta_x, delta_y;
int major_axis, direction;
int double_delta_x;
int double_delta_y;
int diff_double_deltas;
int error, temp;
if (clip)
if (!line_clip(&x1, &y1, &x2, &y2))
return;
// by making sure y1 is greater than y2 we eliminate different line
// possibilites. So, if this condition is false, we just switch our
// coordinates. Now we know the line goes from top to bottom. We just
// need to know if it goes left to right or right to left.
if(y1 > y2) {
temp=y1; y1=y2; y2=temp; // swap y1 and y2
temp=x1; x1=x2; x2=temp; // swap x1 and x2
}
delta_x = x2 - x1; // will determine L->R or R->L
delta_y = y2 - y1; // has to be positive because line goes T->B
if(delta_x > 0) // delta_x is positive: going left to right
direction = 1;
else { // delta_x is negative: going right to left
delta_x = -delta_x; // need absolute length of this axis later on
direction = -1;
}
if(delta_x > delta_y)
major_axis = 0; // our main axis is the x
else
major_axis = 1; // our main axis in the y
vid=video+y1*XRES;
switch(major_axis) { // what is our main axis
case 0: // major axis is the x
double_delta_y = delta_y + delta_y;
diff_double_deltas = double_delta_y - (delta_x + delta_x);
error = double_delta_y - delta_x;
vid[x1]=col;
while(delta_x--) { // loop for the length of the major axis
if(error >= 0) { // if the error is greater than or equal to zero:
vid+=XRES; // increase the minor axis (y)
error += diff_double_deltas;
}
else error += double_delta_y;
x1 += direction; // increase the major axis to next pixel
vid[x1]=col;
}
break;
case 1: // major axis is the y
double_delta_x = delta_x + delta_x;
diff_double_deltas = double_delta_x - (delta_y + delta_y);
error = double_delta_x - delta_y;
vid[x1]=col;
while(delta_y--) { // loop for the length of the major axis
if(error >= 0) { // if the error is greater than or equal to zero:
x1 += direction; // increase the minor axis (x)
error += diff_double_deltas;
} else error += double_delta_x;
vid+=XRES; // increase major axis to next pixel
vid[x1]=col;
}
break;
}
}
/* // no better...
void line(int x, int y, int x2, int y2, uchar col, int clip) {
int i,j,l, la;
int e,f,g;
uchar *vid;
if (clip)
if (!line_clip(&x, &y, &x2, &y2))
return;
i = x2-x; if (i<0) i = -i;
j = y2-y; if (j<0) j = -j;
if (i < j) {
f = j;
e = x2 - x;
e = ((e+1) << 16)/f;
g = x << 16;
if (y > y2) {
la = -1; y2--;
} else {
la = 1; y2++;
}
vid = &video[y*XRES];
for (l = y; l != y2; l+=la) {
vid[g>>16] = col;
vid+=XRES;
g = g + e;
}
} else {
f = i;
e = y2 - y;
e = ((e+1) << 16)/f;
g = y << 16;
if (x > x2) {
la = -1; x2--;
} else {
la = 1; x2++;
}
vid = video;
for (l = x; l != x2; l+=la) {
vid[(g>>16)*XRES + l] = col;
g = g + e;
}
}
}
*/
void polyLine(intVector v[], int points, uchar col, uchar connect, int clip) {
register int i;
if (connect) {
v[points].x=v[0].x;
v[points].y=v[0].y;
points++;
}
for (i=0; i<points-1; i++) {
line(v[i].x, v[i].y, v[i+1].x, v[i+1].y, col, clip);
}
}
typedef struct vec_interpolate {
double xy_l,yy_l,zy_l;
double xy_r,yy_r,zy_r;
double x_ay_l,y_ay_l,z_ay_l;
double x_ay_r,y_ay_r,z_ay_r;
int x_ax, y_ax, z_ax;
intVector ip_pos;
} vec_interpolate;
/* Initierar värden för interpolering av en vektor i "y-led" */
static void vecpolinit(vec_interpolate *vp, Vector v1, Vector v2, double div_val, int left) {
if (left) {
vp->x_ay_l=(v1.x-v2.x)/div_val;
vp->y_ay_l=(v1.y-v2.y)/div_val;
vp->z_ay_l=(v1.z-v2.z)/div_val;
vp->xy_l=v2.x;
vp->yy_l=v2.y;
vp->zy_l=v2.z;
}
else {
vp->x_ay_r=(v1.x-v2.x)/div_val;
vp->y_ay_r=(v1.y-v2.y)/div_val;
vp->z_ay_r=(v1.z-v2.z)/div_val;
vp->xy_r=v2.x;
vp->yy_r=v2.y;
vp->zy_r=v2.z;
}
}
/* Interpolerar vektor i "y-led" */
static void vecpol_addydelt(vec_interpolate *vp, int left) {
if (left) {
vp->xy_l+=vp->x_ay_l;
vp->yy_l+=vp->y_ay_l;
vp->zy_l+=vp->z_ay_l;
}
else {
vp->xy_r+=vp->x_ay_r;
vp->yy_r+=vp->y_ay_r;
vp->zy_r+=vp->z_ay_r;
}
}
/* Initierar värden för interpolering av en vektor i "x-led" */
static void vecpolinit_x(vec_interpolate *vp, double div_val, int rev) {
if (!rev) {
vp->ip_pos.x=vp->xy_l*65536;
vp->ip_pos.y=vp->yy_l*65536;
vp->ip_pos.z=vp->zy_l*65536;
vp->x_ax=-(vp->xy_l-vp->xy_r)*65536/div_val;
vp->y_ax=-(vp->yy_l-vp->yy_r)*65536/div_val;
vp->z_ax=-(vp->zy_l-vp->zy_r)*65536/div_val;
}
else {
vp->ip_pos.x=vp->xy_r*65536;
vp->ip_pos.y=vp->yy_r*65536;
vp->ip_pos.z=vp->zy_r*65536;
vp->x_ax=-(vp->xy_r-vp->xy_l)*65536/div_val;
vp->y_ax=-(vp->yy_r-vp->yy_l)*65536/div_val;
vp->z_ax=-(vp->zy_r-vp->zy_l)*65536/div_val;
}
}
/* Interpolerar vektor i "x-led" */
static void vecpol_addxdelt(vec_interpolate *vp) {
vp->ip_pos.x+=vp->x_ax;
vp->ip_pos.y+=vp->y_ax;
vp->ip_pos.z+=vp->z_ax;
}
int scan3_tmap(intVector vv[], int clipedges[], Bitmap *tex, PREPCOL plusVal) {
register uchar I;
uchar *vid;
register int ysweep,xx1,xx2,yyy;
register int texw, texh;
int i,MINy,MAXy,MIDy=0,yEND, j;
int lut1,lut2,x1,x2;
intVector *cp;
unsigned int upp,vpp;
float temp;
vec_interpolate tex_ip;
texw = tex->xSize;
texh = tex->ySize;
cp=vv;
// Om alla koordinater har samma y-position, rita ej ut ngt.
if (cp[0].y==cp[1].y && cp[1].y==cp[2].y) return 0;
if (cp[0].y < 0 && cp[1].y < 0 && cp[2].y < 0) return 0;
if (cp[0].x < 0 && cp[1].x < 0 && cp[2].x < 0) return 0;
if (cp[0].y >= YRES && cp[1].y >= YRES && cp[2].y >= YRES) return 0;
if (cp[0].x >= XRES && cp[1].x >= XRES && cp[2].x >= XRES) return 0;
xx1=cp[0].x; yyy=cp[0].y;
// Om två(eller fler) punkter har samma x- och y-koordinat är triangeln korrupt.
for (i=1; i<3; i++)