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dots: update minimal to match 6502

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This commit is contained in:
Vince Weaver 2023-11-28 14:46:11 -05:00
parent e2c14813ed
commit a2feef02da
2 changed files with 20 additions and 48 deletions
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18
utils/gr-sim/dots/dots_6502.c
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@ -28,9 +28,8 @@ static short rotcos=0;
static void drawdots(void) { static void drawdots(void) {
int temp32; int temp32;
// int transx,transz;
unsigned short ball_x,ball_y,shadow_y; unsigned short ball_x,ball_y,shadow_y;
unsigned short d,sc,newy; unsigned short d,distance,newy;
unsigned short ax; unsigned short ax;
short signed_ax; short signed_ax;
@ -43,9 +42,10 @@ static void drawdots(void) {
/* by= (ez/dz)*dy + ey */ /* by= (ez/dz)*dy + ey */
temp32=((dot_z[d]*rotcos)-(dot_x[d]*rotsin)); temp32=((dot_z[d]*rotcos)-(dot_x[d]*rotsin));
sc=(temp32>>16)+9000; distance=(temp32>>16)+9000;
if (sc==0) sc=1; if (distance==0) distance=1;
// printf("%d\n",sc-9000);
// printf("%d\n",distance-9000);
temp32=((dot_x[d]*rotcos)+(dot_z[d]*rotsin)); temp32=((dot_x[d]*rotcos)+(dot_z[d]*rotsin));
@ -53,9 +53,9 @@ static void drawdots(void) {
temp32=temp32+(temp32>>3); temp32=temp32+(temp32>>3);
ball_x=(temp32/sc)/8; ball_x=(temp32/distance)/8;
// printf("%x/%x/8=%x\n",temp32,sc,ball_x); // printf("%x/%x/8=%x\n",temp32,distance,ball_x);
/* center */ /* center */
ball_x+=20; ball_x+=20;
@ -67,7 +67,7 @@ static void drawdots(void) {
/* shadow */ /* shadow */
/**********/ /**********/
shadow_y=0x80000/sc/4; shadow_y=0x80000/distance/4;
/* center it */ /* center it */
shadow_y+=24; shadow_y+=24;
@ -110,7 +110,7 @@ static void drawdots(void) {
temp32<<=6; temp32<<=6;
newy=temp32/sc/4; newy=temp32/distance/4;
/* center */ /* center */
ball_y=newy+24; ball_y=newy+24;

50
utils/gr-sim/dots/dots_minimal.c
View File

@ -35,58 +35,36 @@ static short rotcos=0;
static void drawdots(void) { static void drawdots(void) {
int temp32; int temp32;
int transx,transz;
int yy; int yy;
unsigned short ball_x,ball_y,shadow_y; unsigned short ball_x,ball_y,shadow_y;
unsigned short d,sc,newy; unsigned short d,distance,newy;
unsigned short ax,bx,cx,dx; unsigned short ax;
short signed_ax; short signed_ax;
for(d=0;d<512;d+=SKIP) { for(d=0;d<512;d+=SKIP) {
transx=dot[d].x*rotsin; temp32=(dot[d].z*rotcos)-(dot[d].x*rotsin);
transz=dot[d].z*rotcos; distance=(temp32>>16)+9000;
temp32=transz-transx; if (distance==0) distance=1;
sc=(temp32>>16)+9000;
if (sc==0) sc=1;
transx=dot[d].x*rotcos; temp32=((dot[d].x*rotcos)+(dot[d].z*rotsin));
transz=dot[d].z*rotsin;
temp32=transx+transz;
temp32>>=8; temp32>>=8;
ax=temp32&0xffff; temp32=temp32+(temp32>>3);
dx=(temp32>>16)&0xffff;
bx=ax; // mov bx,ax ball_x=(temp32/distance);
cx=dx; // mov cx,dx
ax=(ax>>3)|(dx<<13); // shrd ax,dx,3
// dx=sar(dx,3); // sar dx,3
signed_ax=dx;
dx=signed_ax>>3;
temp32=ax+bx; // add ax,bx
ax=ax+bx;
dx=dx+cx; // adc dx,cx
if (temp32&(1<<16)) dx=dx+1;
temp32=(dx<<16)|(ax&0xffff);
if (sc) ball_x=(temp32/sc)&0xffff;
else ball_x=0;
/* center */
ball_x+=160; ball_x+=160;
/* if off end of screen, no need for shadow */ /* if off end of screen, no need for shadow */
if (ball_x>319) continue; if (ball_x>319) continue;
/**********/ /**********/
/* shadow */ /* shadow */
/**********/ /**********/
shadow_y=0x80000/sc; shadow_y=0x80000/distance;
/* center it */ /* center it */
shadow_y+=100; shadow_y+=100;
@ -109,11 +87,9 @@ static void drawdots(void) {
temp32=newy; temp32=newy;
if (temp32&0x8000) temp32|=0xffff0000; if (temp32&0x8000) temp32|=0xffff0000;
if (temp32>=gravitybottom) { if (temp32>=gravitybottom) {
ax=-dot[d].yadd;
temp32=(-dot[d].yadd)*gravityd; temp32=(-dot[d].yadd)*gravityd;
ax=temp32&0xffff; ax=temp32&0xffff;
// ax=sar(ax,4);
signed_ax=ax; signed_ax=ax;
ax=signed_ax>>4; ax=signed_ax>>4;
@ -130,12 +106,8 @@ static void drawdots(void) {
} }
temp32<<=6; temp32<<=6;
// dx=(dx<<6)|(newy>>10); // shld dx,ax,6
// newy=newy<<6; // shl ax,6
// ax=newy;
// idiv_16(sc); // idiv sc
if (sc) newy=temp32/sc; newy=temp32/distance;
/* center */ /* center */
ball_y=newy+100; // add ax,100 ball_y=newy+100; // add ax,100