forked from KolibriOS/kolibrios
289 lines
6.3 KiB
Plaintext
289 lines
6.3 KiB
Plaintext
MAX_SPHERES = 5
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MAX_LIGHTS = 3
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;ray
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main_loop:
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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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init_calc: ; do some intial calculations
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ret
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find_intersection: ;with for now single sphere
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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,128
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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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mov .iy,eax
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mov .ix,ebx
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mov .one_write,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:
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xorps xmm5,xmm5
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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] ;[sphere] ;;[edx]
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mulps xmm5,[float2]
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movaps xmm0,.dx
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mulps xmm5,xmm0
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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] ;[sphere] ; [edx]
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mulps xmm4,xmm4
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; haddps xmm4,xmm4
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; haddps 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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; addss xmm4,xmm5
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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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; add .sph_counter,1
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; cmp .sph_counter,MAX_SPHERES
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; jnz .next_sph
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; jmp .put_pixel
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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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movss xmm5,xmm4
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cmpnltss xmm4,.t1
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movd ecx,xmm4
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or ecx,ecx
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jne @f
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movss xmm5,.t2
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@@:
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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,xmm5
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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],xmm5
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; push .a
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; pop [smalest_a]
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; push .b
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; pop [smalest_b]
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; push .c
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; pop [smalest_c]
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; push .delta
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; pop [smalest_delta]
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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
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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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.put_pixel:
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cmp .one_write,0
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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
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movaps xmm7,xmm4
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subps xmm4,[nearest_sphere]
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; movaps xmm6,xmm7
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; addps xmm6,[nearest_sphere]
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; movaps .sph_xyz,xmm6
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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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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]
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shufps xmm2,xmm2,0
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.next_light:
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; push eax
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mov ebx,eax
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shl ebx,4
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;add eax,light
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movaps xmm5,[light+ebx];[light] ;; [eax]
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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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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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; movaps xmm5,xmm4
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; mulps xmm5,xmm5
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; mulps xmm5,xmm5
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; mulps xmm5,[color]
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mulps xmm4,[lights_color+ebx] ; xmm4 - computed col. light vector dep.
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; addps xmm4,xmm5
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mulps xmm4,xmm2
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addps xmm3,xmm4
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; pop eax
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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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if 0
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; mix with texture
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movaps xmm0,.sph_xyz
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movss xmm1,[nearest_radius]
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shufps xmm1,xmm1,0
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divps xmm0,xmm1
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mulps xmm0,[correct_tex] ; f64
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; addps xmm0,[correct_tex]
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cvtss2si eax,xmm0
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psrldq xmm0,4
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cvtss2si ebx,xmm0
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imul ebx,[tex_x]
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add ebx,eax
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lea ebx,[ebx*3]
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add ebx,bitmap
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;mov eax,[ebx]
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movd xmm1,[ebx]
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xorps xmm7,xmm7
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punpcklbw xmm1,xmm7
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punpcklwd xmm1,xmm7
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cvtdq2ps xmm1,xmm1
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mulps xmm3,xmm1
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divps xmm3,[float255]
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; divps xmm1,[float2]
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; divps xmm3,[float2]
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; addps xmm3,xmm1
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end if
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minps xmm3,[float255]
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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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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,128
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pop ebp
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ret
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