forked from KolibriOS/kolibrios
485 lines
11 KiB
PHP
485 lines
11 KiB
PHP
MAX_SPHERES = 4 ;8
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MAX_LIGHTS = 6
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main_loop:
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call normalize_surface
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xor eax,eax ; y
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.next_line:
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xor ebx,ebx ; x
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@@:
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push eax
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push ebx
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call find_intersection
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pop ebx
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pop eax
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add ebx,1
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cmp ebx,XRES
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jnz @b
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add eax,1
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cmp eax,YRES
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jnz .next_line
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ret
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normalize_surface:
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movss xmm0,[surface+8]
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movlhps xmm0,xmm0
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movlps xmm0,[surface]
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movaps xmm1,xmm0
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mulps xmm0,xmm0
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haddps xmm0,xmm0
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haddps xmm0,xmm0
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sqrtss xmm0,xmm0
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shufps xmm0,xmm0,0
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divps xmm1,xmm0
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movaps xmm2,xmm1
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pslldq xmm2,4
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psrldq xmm2,4
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movaps [surface_without_d],xmm2
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movlps [surface],xmm1
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movhlps xmm1,xmm1
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movss [surface+8],xmm1
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ret
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find_intersection:
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; eax - y
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; ebx - x
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push ebp
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mov ebp,esp
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sub esp,256
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and ebp,0xfffffff0
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.dz equ dword[ebp-8]
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.dy equ dword[ebp-12]
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.dx equ [ebp-16]
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.a equ dword[ebp-20]
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.b equ dword[ebp-24]
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.c equ dword[ebp-28]
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.delta equ dword[ebp-32]
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.iy equ dword[ebp-36]
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.ix equ [ebp-40]
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.t1 equ [ebp-44]
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.t2 equ [ebp-48]
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.n equ [ebp-64]
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.sph_xyz equ [ebp-80]
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.one_write equ byte [ebp-81] ;tells if sth written in 'nearest' data
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.sph_counter equ dword [ebp-85]
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.dx_sh equ [ebp-96]
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.a_sh equ [ebp-100]
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.b_sh equ [ebp-104]
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.c_sh equ [ebp-108]
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.delta_sh equ [ebp-112]
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.sph_counter_sh equ dword[ebp-116]
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.shadow_mark equ dword [ebp-120]
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.nearest_surface equ [ebp-144]
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.vd equ [ebp-148] ; denominator in plane inters. equation
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mov .iy,eax
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mov .ix,ebx
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mov .one_write,0
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mov .shadow_mark,0
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xorps xmm0,xmm0
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cvtpi2ps xmm0,.ix
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mov ecx,XRES
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cvtsi2ss xmm2,ecx
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shufps xmm2,xmm2,0
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divps xmm0,xmm2
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subps xmm0,[camera]
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movaps .dx,xmm0
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movaps xmm1,xmm0
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mulps xmm1,xmm0
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haddps xmm1,xmm1
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haddps xmm1,xmm1
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movss .a,xmm1
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mov .sph_counter,0
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.next_sph: ; intersection with sphere
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movaps xmm5,[camera]
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mov edx,.sph_counter
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shl edx,4
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add edx,sphere
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subps xmm5,[edx]
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mulps xmm5,[float2]
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mulps xmm5,.dx
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haddps xmm5,xmm5
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haddps xmm5,xmm5
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movss .b,xmm5
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movaps xmm4,[edx]
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mulps xmm4,xmm4
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movaps xmm5,[camera]
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mulps xmm5,xmm5
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addps xmm4,xmm5
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haddps xmm4,xmm4
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haddps xmm4,xmm4
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movaps xmm5,[edx] ;;[sphere] ;; [edx]
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mulps xmm5,[camera]
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haddps xmm5,xmm5
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haddps xmm5,xmm5
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mulss xmm5,[float2]
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subss xmm4,xmm5
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mov ebx,.sph_counter
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shl ebx,2
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add ebx,sph_radius
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movss xmm5,[ebx] ;[R] ; [ebx]
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mulss xmm5,xmm5
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subss xmm4,xmm5
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movss .c,xmm4
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movss xmm5,.b
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mulss xmm5,xmm5
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mulss xmm4,.a
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mulss xmm4,[float4]
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subss xmm5,xmm4
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movss .delta,xmm5
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xorps xmm6,xmm6
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cmpnltss xmm5,xmm6
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movd ecx,xmm5 ; ecx = -1 => greater than 0.0
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cmp ecx,0
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jnz @f
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jmp .next_s ; no intersection
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@@:
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movss xmm5,.delta
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sqrtss xmm5,xmm5
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movss xmm4,xmm5
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subss xmm6,.b
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movss xmm7,xmm6
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subss xmm6,xmm5
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divss xmm6,[float2]
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divss xmm6,.a
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movss .t1,xmm6
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addss xmm4,xmm7
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divss xmm4,[float2]
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divss xmm4,.a
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movss .t2,xmm4
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maxss xmm6,xmm4
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cmp .one_write,0 ; test if sth in 'nearest' data is written
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jz @f
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movss xmm4,xmm6 ;5
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cmpnltss xmm4,[smalest_t]
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movd ecx,xmm4
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or ecx,ecx
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jz .next_s
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@@:
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movss [smalest_t],xmm6 ;5
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movaps xmm0,[edx]
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movaps [nearest_sphere],xmm0
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push dword[ebx]
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pop dword[nearest_radius]
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mov .one_write,1 ; one_write - object index -> 1 = sphere
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.next_s:
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add .sph_counter,1
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cmp .sph_counter,MAX_SPHERES
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jnz .next_sph
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if 1
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movaps xmm0,[surface_without_d] ; find with plane intersection
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mulps xmm0,[camera] ; only one surface is computed
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haddps xmm0,xmm0
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haddps xmm0,xmm0
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addss xmm0,[surface+12]
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movaps xmm1,[surface_without_d]
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mulps xmm1,.dx
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haddps xmm1,xmm1
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haddps xmm1,xmm1
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xorps xmm2,xmm2
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cmpnless xmm2,xmm1
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movd ecx,xmm2
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cmp ecx,0 ;-1
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je .put_pixel ; denominator equal 'zero' - no intersection
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xorps xmm2,xmm2 ; denominator > 0 -> inters. not in screen area
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movss .vd,xmm1 ; write to memory this denom.
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divss xmm0,xmm1
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subss xmm2,xmm0
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cmp .one_write,0
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jz @f
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movss xmm0,xmm2
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cmpnltss xmm2,[smalest_t]
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movd ecx,xmm2
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cmp ecx,0
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je .put_pixel
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@@:
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movss [smalest_t],xmm0
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; test [smalest_t],0x80000000
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; jz @f
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; and [smalest_t],0x7fffffff
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; @@:
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movaps xmm2,[surface]
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movaps .nearest_surface,xmm2
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mov .one_write,2 ; nearest object -> 2 = flat plane
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end if
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.put_pixel:
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cmp .one_write,0 ; end if no intersection
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je .end
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movss xmm5,[smalest_t]
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shufps xmm5,xmm5,0 ; calc and put pixel
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movaps xmm6,.dx
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mulps xmm6,xmm5
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movaps xmm4,[camera]
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addps xmm4,xmm6 ; xmm4 - x,y,z on the sphere or on surface
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movaps .sph_xyz,xmm4
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if 1
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cmp .one_write,2
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jne .shadow
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; movaps xmm4,.sph_xyz
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movaps xmm7,xmm4
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lea ebx,.nearest_surface
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movss xmm4,[ebx+8]
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movlhps xmm4,xmm4
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movlps xmm4,[ebx] ; xmm4 - normal to surface vector
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test dword .vd,0x80000000
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jz @f
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andps xmm4,[positive_mask] ;0x7fffffff
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@@:
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jmp .calc_pix
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end if
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.shadow:
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if 1
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; to find shadow intersect:
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; P0 - point on sphere
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; P1 - light
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; with every other sphere in scene if any intersection occured -
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; - point is in shadow
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; next_sph_shad:
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mov ecx,MAX_LIGHTS
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.next_light_sh:
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push ecx
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shl ecx,4
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movaps xmm0,[ecx+light] ;xmm4 - point on nearest sphere
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subps xmm0,xmm4
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movaps .dx_sh,xmm0
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mulps xmm0,xmm0
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haddps xmm0,xmm0
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haddps xmm0,xmm0
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movss .a_sh,xmm0
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mov .sph_counter_sh,0
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.next_sph_sh: ; be sure you not intersect nearest sphere with itself
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movaps xmm5,.sph_xyz ;[light]
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mov edx,.sph_counter_sh
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shl edx,4
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add edx,sphere
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movaps xmm7,[edx]
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cmpeqps xmm7,[nearest_sphere]
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movmskps ecx,xmm7
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and ecx,0111b
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cmp ecx,0
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jne .next_s_sh
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subps xmm5,[edx] ; [edx] - cur sph
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mulps xmm5,[float2]
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mulps xmm5,.dx_sh
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haddps xmm5,xmm5
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haddps xmm5,xmm5
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movss .b_sh,xmm5
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movaps xmm4,[edx]
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mulps xmm4,xmm4
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movaps xmm5,.sph_xyz
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mulps xmm5,xmm5
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addps xmm4,xmm5
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haddps xmm4,xmm4
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haddps xmm4,xmm4
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movaps xmm5,.sph_xyz
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mulps xmm5,[edx]
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haddps xmm5,xmm5
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haddps xmm5,xmm5
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mulss xmm5,[float2]
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subss xmm4,xmm5
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mov ebx,.sph_counter_sh
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shl ebx,2
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add ebx,sph_radius
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movss xmm5,[ebx]
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mulss xmm5,xmm5
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subss xmm4,xmm5
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movss .c_sh,xmm4
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movss xmm5,.b_sh
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mulss xmm5,xmm5
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mulss xmm4,.a_sh
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mulss xmm4,[float4]
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subss xmm5,xmm4
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movss .delta_sh,xmm5
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xorps xmm6,xmm6
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cmpnltss xmm5,xmm6
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movd ecx,xmm5 ; ecx = -1 greater than 0.0
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cmp ecx,0
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jnz @f
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jmp .next_s_sh ; no intersection
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@@:
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add .shadow_mark,1 ; mark ->point in shadow
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pop ecx
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sub ecx,1
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jnz .next_light_sh
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jmp .put_pix
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.next_s_sh:
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add .sph_counter_sh,1
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cmp .sph_counter_sh,MAX_SPHERES
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jnz .next_sph_sh
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pop ecx
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sub ecx,1
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jnz .next_light_sh
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end if
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.put_pix:
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movaps xmm4,.sph_xyz
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movaps xmm7,xmm4
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subps xmm4,[nearest_sphere]
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movss xmm0,[nearest_radius]
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shufps xmm0,xmm0,0
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divps xmm4,xmm0 ; xmm4 - normal to surface vector
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.calc_pix: ; normal computed
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movaps xmm1,xmm4 ; copy of normal in xmm1
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xor eax,eax
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xorps xmm3,xmm3
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; movss xmm2,[light_factor] ; other model of lighting
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; shufps xmm2,xmm2,0
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.next_light:
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mov ebx,eax
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shl ebx,4
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movaps xmm5,[light+ebx]
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subps xmm5,xmm7 ; calc light unit vector
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movaps xmm6,xmm5
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mulps xmm5,xmm5
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haddps xmm5,xmm5
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haddps xmm5,xmm5
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sqrtss xmm5,xmm5
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shufps xmm5,xmm5,0
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divps xmm6,xmm5 ; xmm6 - normalized light vector
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; dot_product
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movaps xmm4,xmm1 ; xmm4 - normal to surface
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mulps xmm4,xmm6
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haddps xmm4,xmm4
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haddps xmm4,xmm4
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shufps xmm4,xmm4,0
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mulps xmm4,[lights_color+ebx] ; xmm4 - computed col. light vector dep.
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; mulps xmm4,xmm2 ; other model of lighting
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; addps xmm3,xmm4
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maxps xmm3,xmm4 ; will be this better ?
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add eax,1
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cmp eax,MAX_LIGHTS
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jnz .next_light
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minps xmm3,[float255]
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cmp .shadow_mark,0
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je @f
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cvtsi2ss xmm2,.shadow_mark
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shufps xmm2,xmm2,0
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mulps xmm2,[shadow_factor]
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subps xmm3,xmm2
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xorps xmm0,xmm0
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maxps xmm3,xmm0
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@@:
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cvtps2dq xmm3,xmm3
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packssdw xmm3,xmm3
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packuswb xmm3,xmm3
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paddusb xmm3,[ambient_col]
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if 1
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cmp .one_write,2
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jne .perspective
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movaps xmm0,xmm3 ; calc texture on plane
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movaps xmm1,.sph_xyz
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mov ecx,XRES
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cvtsi2ss xmm4,ecx
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shufps xmm4,xmm4,0
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mulps xmm1,xmm4
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cvtps2dq xmm1,xmm1
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movd ecx,xmm1
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test ecx,0x8
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jz @f
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mov ecx,0xffffffff
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jmp .next_tex_test
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@@:
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xor ecx,ecx
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.next_tex_test:
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psrldq xmm1,8
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movd ebx,xmm1
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test ebx,0x20
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jz @f
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mov ebx,0xffffffff
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jmp .set_tex
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@@:
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xor ebx,ebx
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.set_tex:
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xor ebx,ecx
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shr ebx,28
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mov bh,bl
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movd xmm7,ebx
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paddusb xmm3,xmm7
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end if
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.perspective:
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movaps xmm0,.sph_xyz ; perspective correction
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subps xmm0,[camera]
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movss xmm1,[camera]
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movss xmm2,xmm0
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movaps xmm4,xmm0
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shufps xmm4,xmm4,00000010b
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divss xmm2,xmm4
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mulss xmm2,[camera+8]
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subss xmm1,xmm2 ; xmm1 - x
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movaps xmm2,xmm0
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shufps xmm2,xmm2,00000001b
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movaps xmm4,xmm0
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shufps xmm4,xmm4,00000010b
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divss xmm2,xmm4
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mulss xmm2,[camera+8]
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movss xmm4,[camera+4]
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subss xmm4,xmm2 ; xmm4 - y
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mov ebx,XRES
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cvtsi2ss xmm2,ebx
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mulss xmm1,xmm2
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mulss xmm4,xmm2
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cvtss2si ecx,xmm1
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mov .ix,ecx
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cvtss2si edx,xmm4
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mov .iy,edx
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mov edi,screen
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mov ecx,XRES
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imul ecx,.iy
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add ecx,.ix
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lea ecx,[ecx*3]
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add edi,ecx
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movd [edi],xmm3
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.end:
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add esp,256
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pop ebp
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ret
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