111 lines
3.0 KiB
NASM
111 lines
3.0 KiB
NASM
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align 4
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proc calc_buf uses ebx ecx, buf:dword, shininess:dword
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locals
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val dd ? ;float
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f_inc dd ? ;float
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endl
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mov dword[val],0.0f
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mov dword[f_inc],SPECULAR_BUFFER_SIZE
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fld1
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fidiv dword[f_inc]
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fstp dword[f_inc] ;f_inc = 1.0f/SPECULAR_BUFFER_SIZE
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mov ebx,[buf]
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add ebx,offs_spec_buf
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xor ecx,ecx
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align 4
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.cycle_0: ;for (i = 0; i <= SPECULAR_BUFFER_SIZE; i++)
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cmp ecx,SPECULAR_BUFFER_SIZE
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jg @f
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;Вычисляем x^y
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fld dword[shininess]
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fld dword[val]
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fyl2x ;Стек FPU теперь содержит: st0=z=y*log2(x):
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;Теперь считаем 2**z:
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fld st0 ;Создаем еще одну копию z
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frndint ;Округляем
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fsubr st0,st1 ;st1=z, st0=z-trunc(z)
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f2xm1 ;st1=z, st0=2**(z-trunc(z))-1
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fld1
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faddp ;st1=z, st0=2**(z-trunc(z))
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fscale ;st1=z, st0=(2**trunc(z))*(2**(z-trunc(z)))=2**t
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fxch st1
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fstp st ;Результат остается на вершине стека st0
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fstp dword[ebx] ;buf.buf[i] = pow(val, shininess)
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add ebx,4
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fld dword[val]
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fadd dword[f_inc]
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fstp dword[val] ;val += f_inc
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inc ecx
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jmp .cycle_0
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@@:
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ret
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endp
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align 4
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proc specbuf_get_buffer uses ebx ecx edx, context:dword, shininess_i:dword, shininess:dword
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locals
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found dd ? ;GLSpecBuf *
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oldest dd ? ;GLSpecBuf *
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endl
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mov edx,[context]
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mov eax,[edx+offs_cont_specbuf_first]
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mov [found],eax
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mov [oldest],eax
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mov ebx,[shininess_i]
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.cycle_0:
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or eax,eax ;while (found)
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jz @f
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cmp [eax+offs_spec_shininess_i],ebx ;while (found.shininess_i != shininess_i)
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je @f
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mov ecx,[oldest]
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mov ecx,[ecx+offs_spec_last_used]
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cmp [eax+offs_spec_last_used],ecx ;if (found.last_used < oldest.last_used)
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jge .end_0
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mov [oldest],eax ;oldest = found
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.end_0:
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mov eax,[eax+offs_spec_next] ;found = found.next
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jmp .cycle_0
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@@:
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cmp dword[found],0 ;if (found) /* hey, found one! */
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je @f
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mov eax,[found]
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mov ecx,[edx+offs_cont_specbuf_used_counter]
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mov [eax+offs_spec_last_used],ecx ;found.last_used = context.specbuf_used_counter
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inc dword[edx+offs_cont_specbuf_used_counter]
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jmp .end_f ;return found
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@@:
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cmp dword[oldest],0 ;if (oldest == NULL || context.specbuf_num_buffers < MAX_SPECULAR_BUFFERS)
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je @f
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cmp dword[edx+offs_cont_specbuf_num_buffers],MAX_SPECULAR_BUFFERS
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jl @f
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jmp .end_1
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@@:
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; create new buffer
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stdcall gl_malloc, sizeof.GLSpecBuf
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;if (!eax) gl_fatal_error("could not allocate specular buffer")
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inc dword[edx+offs_cont_specbuf_num_buffers]
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mov ecx,[edx+offs_cont_specbuf_first]
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mov [eax+offs_spec_next],ecx
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mov [edx+offs_cont_specbuf_first],eax
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mov ecx,[edx+offs_cont_specbuf_used_counter]
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mov [eax+offs_spec_last_used],ecx
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inc dword[edx+offs_cont_specbuf_used_counter]
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mov [eax+offs_spec_shininess_i],ebx
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stdcall calc_buf, eax,dword[shininess]
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jmp .end_f
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.end_1:
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; overwrite the lru buffer
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;tgl_trace("overwriting spec buffer :(\n");
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mov eax,[oldest]
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mov [eax+offs_spec_shininess_i],ebx
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mov ecx,[edx+offs_cont_specbuf_used_counter]
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mov [eax+offs_spec_last_used],ecx
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inc dword[edx+offs_cont_specbuf_used_counter]
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stdcall calc_buf, eax,dword[shininess]
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.end_f:
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ret
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endp
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