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memories: work on tunnel
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Vince Weaver
parent
3524f3c9a0
commit
db894d69cd
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@ -28,9 +28,9 @@ static unsigned short frame;
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#if 0
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static unsigned short stack[128];
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static int sp=0;
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static unsigned short ax,bx,cx,dx,es;
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static int cf=0,of=0,zf=0,sf=0;
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static int sp=0;
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/* unsigned multiply */
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static void mul_16(unsigned short value) {
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@ -73,7 +73,6 @@ static void imul(short value) {
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*/
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/* signed multiply */
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static void imul_8(char value) {
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@ -204,8 +203,9 @@ static void div_8(unsigned char value) {
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}
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#endif
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#if 0
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static void push(int value) {
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//printf("Pushing %x\n",value);
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stack[sp]=value;
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@ -408,40 +408,45 @@ fx4q:
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#endif
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/* raycast bent tunnel */
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static int fx5(int xx, int yy, int xprime) {
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return 0;
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}
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#if 0
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unsigned char al,cl;
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unsigned short temp;
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dx=((yy&0xff)<<8) | (xprime&0xff);
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unsigned char al;
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unsigned short xcoord,ycoord;
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signed short color,yproj,xproj,depth,ax=0;
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int zf=0;
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signed char m1,m2;
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/* adjust to be centered */
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xcoord=(xprime-10)*4;
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ycoord=(yy-10)*4;
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/* set depth to -9 (move backwards) */
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depth=(-9&0xff);
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cx=cx&0xff00;
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cx|=(-9&0xff); // mov cl,-9 ; start with depth 9 (moves backwards)
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fx5L:
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cl=cx&0xff;
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/* put Ycoord into AL */
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al=ycoord&0xff;
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/* center Y. Necessary? */
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al-=24;
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push(dx); // push dx ; save DX, destroyed inside loop
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al=(dx>>8)&0xff;// mov al,dh ; get Y into AL
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al-=100; // sub al,100 ; centering Y manually
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ax=ax&0xff00;
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ax|=(al&0xff);
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/* 8x8 signed multiply Ycoord*depth to get projection */
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m1=al;
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m2=depth&0xff;
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yproj=m1*m2;
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/* only top used? */
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imul_8(cl); // imul cl ; multiply AL=Y by current distance to get projection
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// xchg ax,dx ; gt X into AL while saving DX
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temp=ax;
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ax=dx;
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dx=temp;
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/* Get X paramater */
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al=xcoord;
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/* add distance to projection (bend right) */
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al+=depth&0xff;
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al=ax&0xff;
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al+=cl; // add al,cl ; add distance to projection (bend right)
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/* 8x8 signed multiply Ycoord*depth to get projection */
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m1=al;
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m2=depth&0xff;
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xproj=m1*m2;
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ax=ax&0xff00;
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ax|=(al&0xff);
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imul_8(cl); // imul cl ; multiply AL=X by the current projection
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al=(dx>>8)&0xff;// mov al,dh ; get projection(1) in AL
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al^=(ax>>8); // xor al,ah ; combine with projection(2)
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al=(yproj>>8)&0xff;// mov al,dh ; get projection(1) in AL
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al^=(xproj>>8); // xor al,ah ; combine with projection(2)
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al+=4; // add al,4 ; center the walls around 0
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if (al&-8) { // test al,-8 ; test if the wall is hit
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zf=0;
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@ -450,23 +455,22 @@ fx5L:
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zf=1;
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}
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dx=pop(); // pop dx (restore dx)
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cx&=0xff00;
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cx|=(cl&0xff);
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cx--;
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if ((cx!=0) && (zf==1)) goto fx5L;
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depth--;
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if ((depth!=0) && (zf==1)) goto fx5L;
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// loopz fx5L (repeat until "hit" or "iter=max"
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cx=cx-frame; // sub cx,bp ; offset depth by time
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al^=(cx&0xff); // xor al,cl ; XOR pattern for texture
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depth=depth-frame; // sub cx,bp ; offset depth by time
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// color=ax;
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al^=(depth&0xff); // xor al,cl ; XOR pattern for texture
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// ah=al/6;
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al=al%6; // aam 6 ; irregular pattern with MOD 6
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color=color; // aam 6 ; irregular pattern with MOD 6
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al+=20; // add al,20 ; offset into grayscale pattern
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ax=al&0xff;
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return ax;
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}
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#endif
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/* ocean night */
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static int fx6(int xx, int yy, int xprime) {
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@ -547,12 +551,12 @@ int main(int argc, char **argv) {
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which=frame/512;
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switch (which&0xff) {
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case 0: color=fx2(xx,yy,xprime); break;
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case 0: color=fx5(xx,yy,xprime); break;
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case 1: color=fx1(xx,yy,xprime); break;
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case 2: color=fx0(xx,yy,xprime); break;
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case 3: color=fx3(xx,yy,xprime); break;
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case 4: color=fx4(xx,yy,xprime); break;
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case 5: color=fx5(xx,yy,xprime); break;
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case 5: color=fx2(xx,yy,xprime); break;
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case 6: color=fx6(xx,yy,xprime); break;
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case 7: return 0;
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default: printf("Trying effect %d\n",which);
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@ -567,6 +571,7 @@ int main(int argc, char **argv) {
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/* so wraps 3 times before updating screen? */
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}
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}
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if (frame%128==0) printf("frame: %d\n",frame);
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grsim_update();
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198
hellmood_memories/tunnel.s
Normal file
198
hellmood_memories/tunnel.s
Normal file
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@ -0,0 +1,198 @@
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; Tunnel, based on the code in Hellmood's Memories
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; by deater (Vince Weaver) <vince@deater.net>
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; Zero Page
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COLOR = $30
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XCOORD = $F0
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YCOORD = $F1
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DEPTH = $F2
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VALUE = $F6
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M1 = $F7
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M2 = $F8
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FRAME = $F9
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TEMP = $FA
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; Soft Switches
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KEYPRESS= $C000
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KEYRESET= $C010
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SET_GR = $C050 ; Enable graphics
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FULLGR = $C052 ; Full screen, no text
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; ROM routines
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PLOT = $F800 ; plot, horiz=y, vert=A (A trashed, XY Saved)
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SETCOL = $F864
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SETGR = $FB40
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tunnel:
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;===================
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; init screen
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jsr SETGR ; 3
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bit FULLGR ; 3
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tunnel_forever:
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inc FRAME ; 2
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ldx #47 ; 2
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yloop:
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ldy #39 ; 2
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xloop:
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; Xcoord = (x-10)*4
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sec ; 1
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tya ; 1
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sbc #10 ; 2
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asl ; 1
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asl ; 1
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sta XCOORD ; 2
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; Ycoord = (y-10)*4
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sec ; 1
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txa ; 1
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sbc #10 ; 2
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asl ; 1
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asl ; 1
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; center
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sbc #24
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sta YCOORD ; 2
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; set depth to -9 (move backwards)
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lda #$f7 ; 2
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sta DEPTH ; 2
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fx5_loop:
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; get ycoord
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lda YCOORD ; 2
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; 8x8 signed multiply of M1*DEPTH
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;sta M1 ; 2
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jsr imul ; 3
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lda M2 ; 2
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sta VALUE ; 2
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; get xcoord
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lda XCOORD ; 2
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; add distance to projection (bend right)
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clc ; 1
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adc DEPTH ; 2
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;sta M1 ; 2
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; 8x8 signed multiply of M1*DEPTH
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jsr imul ; 3
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; do the calculation
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dec DEPTH ; 2
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beq putpixel ; 2 ; is this needed?
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; load the yprojection
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lda VALUE ; 2
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; xor with the xprojection
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eor M2 ; 2
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; center walls around 0
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clc ; 1
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adc #$4 ; 2
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; test with -8, see if wall hit
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sta VALUE ; 2
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and #$f8 ; 2
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beq fx5_loop ; 2
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putpixel:
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; adjust color by frame and set
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sec ; 1
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lda DEPTH ; 2
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sbc FRAME ; 2
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eor VALUE ; 2
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and #$7 ; 2
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;adc #$20
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jsr SETCOL ; 3
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txa ; A==Y1 ; 1
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jsr PLOT ; (X2,Y1) ; 3
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dey ; 1
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bpl xloop ; 2
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dex ; 1
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bpl yloop ; 2
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bmi tunnel_forever ; 2
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;=================================================
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; A = M1
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; DEPTH (preserve) is M2
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imul:
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stx TEMP ; save as we trash it
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sta M1 ; get values in right place
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lda DEPTH
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sta M2
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eor M1 ; calc if we need to adjust at end
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; (++ vs +- vs -+ vs --)
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php ; save status on stack
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; if M1 negative, negate it
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lda M1
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bpl m1_positive
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eor #$ff
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clc
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adc #0
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m1_positive:
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sta M1
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; if M2 negative, naegate it
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lda M2
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bpl m2_positive
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eor #$ff
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clc
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adc #0
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m2_positive:
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sta M2
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;==================
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; unsigned multiply
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; factors in M1 and M2
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lda #0
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ldx #$8
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lsr M1
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clc
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imul_loop:
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bcc no_add
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clc
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adc M2
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no_add:
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ror
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ror M1
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dex
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bne imul_loop
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sta M2
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; done, high result in factor2, low result in factor1
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; adjust to be signed
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; if m1 and m2 positive, good
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; if m1 and m2 negative, good
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; otherwise, negate result
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plp ; restore saved pos/neg value
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bpl done_result
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negate_result:
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sec
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lda #0
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sbc M1
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lda #0
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sbc M2
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done_result:
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sta M2
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ldx TEMP
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rts
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