100 lines
1.6 KiB
PHP
100 lines
1.6 KiB
PHP
lang equ ru
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;
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; Assembler
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; SMALL
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; CODE
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; GaMe
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; Libary
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;
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; Ver 0.05
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;
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; game_collision_2d - get collision of two 2d rectangles
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; result of collision test placed in CF.
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; if CF = 1, objects is collided
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_1dbounce_count=0;
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macro game_collision_2d xy1,wh1,xy2,wh2 ;img1_off,x1,y1,img2_off,x2,y2 ;,otv
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{
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movt eax,xy1
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movt ebx,wh1
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movt ecx,xy2
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movt edx,wh2
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call game_collision_proc
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if ~ defined game_collision_used
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game_collision_used equ 1
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jmp exit
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; eax = x1*65536+y1
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; ebx = w1*65536+h1
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; ecx = x2*65536+y2
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; edx = w2*65536+h2
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game_collision_proc:
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; y h test
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call _1dbounce
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jnc @f
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; x w test
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shr eax,16 ;eax,y1 ;
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shr ebx,16 ;mov ebx,[img1_off+4] ;h1
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shr ecx,16 ;mov ecx,y2 ;
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shr edx,16 ;mov edx,[img2_off+4] ;h2
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call _1dbounce
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@@:
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ret
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; ax - x1, bx - w1, cx - x2, dx - w2
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; or
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; ax - y1, bx - h1, cx - y2, dx - h2
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; if collision ecx is incremented
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_1dbounce:
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cmp cx,ax ; if x2 < x1 jmp anot
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jb anot
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add ax,bx
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cmp ax,cx ; if x1+xs <= x2 not coll
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jbe not_coll
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coll:
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stc ; CF = 1
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ret
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anot:
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add cx,dx
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cmp cx,ax ; x2 + xs2 > x1
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ja coll
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not_coll:
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clc ; CF = 0
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ret
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exit:
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end if
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}
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; approxto
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macro approxto value,target_value,step
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{
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local plus,minus,equal
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mov eax,target_value
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cmp value,eax
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je equal
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mov eax,step
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ja minus
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plus:
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add value,eax
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jmp equal
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minus:
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sub value,eax
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equal:
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}
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macro clamp min,max,arg
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{
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local gr,low,norm
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mov eax,max
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cmp arg,eax
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jg gr
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mov eax,min
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cmp arg,eax
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jnl norm
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gr:
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low:
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mov arg,eax
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norm:
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}
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