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https://github.com/ZDoom/qzdoom.git
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- removed the asm version of R_DrawColumn because it doesn't provide any significant benefit.
On modern systems it is actually slower than the C version, only on old ones it is marginally faster - but the overall execution time for this function is so low that even in the worst case scenario the minor loss of performance on older systems is still not relevant.
This commit is contained in:
Christoph Oelckers
parent
8fd03bc4a3
commit
13efb34964
3 changed files with 13 additions and 132 deletions
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@ -598,106 +598,6 @@ dmsdone add esp,8
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;*----------------------------------------------------------------------
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;*
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;* R_DrawColumnP
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;*
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;*----------------------------------------------------------------------
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GLOBAL @R_DrawColumnP_ASM@0
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GLOBAL _R_DrawColumnP_ASM
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GLOBAL R_DrawColumnP_ASM
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align 16
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R_DrawColumnP_ASM:
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_R_DrawColumnP_ASM:
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@R_DrawColumnP_ASM@0:
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; count = dc_yh - dc_yl;
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mov ecx,[dc_count]
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test ecx,ecx
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jle near rdcpret ; count <= 0: nothing to do, so leave
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push ebp ; save registers
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push ebx
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push edi
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push esi
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; dest = ylookup[dc_yl] + dc_x + dc_destorg;
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mov edi,[dc_dest]
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mov ebp,ecx
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mov ebx,[dc_texturefrac] ; ebx = frac
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rdcp1: sub edi,SPACEFILLER4
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mov ecx,ebx
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shr ecx,16
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mov esi,[dc_source]
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mov edx,[dc_iscale]
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mov eax,[dc_colormap]
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cmp BYTE [CPU+66],byte 5
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jg rdcploop2
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align 16
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; The registers should now look like this:
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;
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; [31 .. 16][15 .. 8][7 .. 0]
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; eax [colormap ]
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; ebx [yi ][yf ]
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; ecx [scratch ]
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; edx [dyi ][dyf ]
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; esi [source texture column ]
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; edi [destination screen pointer ]
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; ebp [counter ]
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;
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; Note the partial register stalls on anything better than a Pentium
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; That's why there are two versions of this loop.
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rdcploop:
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mov cl,[esi+ecx] ; Fetch texel
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xor ch,ch
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add ebx,edx ; increment frac
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rdcp2: add edi,SPACEFILLER4 ; increment destination pointer
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mov cl,[eax+ecx] ; colormap texel
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mov [edi],cl ; Store texel
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mov ecx,ebx
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shr ecx,16
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dec ebp
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jnz rdcploop ; loop
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pop esi
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pop edi
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pop ebx
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pop ebp
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rdcpret:
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ret
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align 16
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rdcploop2:
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movzx ecx,byte [esi+ecx] ; Fetch texel
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add ebx,edx ; increment frac
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mov cl,[eax+ecx] ; colormap texel
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rdcp3: add edi,SPACEFILLER4 ; increment destination pointer
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mov [edi],cl ; Store texel
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mov ecx,ebx
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shr ecx,16
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dec ebp
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jnz rdcploop2 ; loop
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pop esi
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pop edi
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pop ebx
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pop ebp
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ret
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;*----------------------------------------------------------------------
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;*
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;* R_DrawFuzzColumnP
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@ -1648,9 +1548,6 @@ ASM_PatchPitch:
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_ASM_PatchPitch:
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@ASM_PatchPitch@0:
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mov eax,[dc_pitch]
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mov [rdcp1+2],eax
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mov [rdcp2+2],eax
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mov [rdcp3+2],eax
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mov [s4p+1],eax
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mov [a4p+1],eax
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mov [ac4p+1],eax
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@ -69,16 +69,11 @@ int scaledviewwidth;
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// These get changed depending on the current
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// screen depth and asm/no asm.
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void (*R_DrawColumnHoriz)(void);
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void (*R_DrawColumn)(void);
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void (*R_DrawFuzzColumn)(void);
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void (*R_DrawTranslatedColumn)(void);
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void (*R_DrawShadedColumn)(void);
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void (*R_DrawSpan)(void);
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void (*R_DrawSpanMasked)(void);
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void (*R_DrawSpanTranslucent)(void);
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void (*R_DrawSpanMaskedTranslucent)(void);
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void (*R_DrawSpanAddClamp)(void);
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void (*R_DrawSpanMaskedAddClamp)(void);
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void (*rt_map4cols)(int,int,int);
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//
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@ -171,7 +166,6 @@ void R_InitShadeMaps()
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/* */
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/************************************/
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#ifndef X86_ASM
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//
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// A column is a vertical slice/span from a wall texture that,
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// given the DOOM style restrictions on the view orientation,
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@ -179,7 +173,7 @@ void R_InitShadeMaps()
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// Thus a special case loop for very fast rendering can
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// be used. It has also been used with Wolfenstein 3D.
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//
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void R_DrawColumnP_C (void)
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void R_DrawColumn (void)
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{
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int count;
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BYTE* dest;
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@ -222,7 +216,7 @@ void R_DrawColumnP_C (void)
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} while (--count);
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}
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}
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#endif
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// [RH] Just fills a column with a color
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void R_FillColumnP (void)
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@ -1192,7 +1186,7 @@ void R_DrawSpanMaskedP_C (void)
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}
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#endif
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void R_DrawSpanTranslucentP_C (void)
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void R_DrawSpanTranslucent (void)
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{
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dsfixed_t xfrac;
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dsfixed_t yfrac;
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@ -1252,7 +1246,7 @@ void R_DrawSpanTranslucentP_C (void)
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}
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}
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void R_DrawSpanMaskedTranslucentP_C (void)
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void R_DrawSpanMaskedTranslucent (void)
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{
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dsfixed_t xfrac;
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dsfixed_t yfrac;
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@ -1326,7 +1320,7 @@ void R_DrawSpanMaskedTranslucentP_C (void)
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}
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}
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void R_DrawSpanAddClampP_C (void)
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void R_DrawSpanAddClamp (void)
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{
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dsfixed_t xfrac;
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dsfixed_t yfrac;
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@ -1392,7 +1386,7 @@ void R_DrawSpanAddClampP_C (void)
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}
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}
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void R_DrawSpanMaskedAddClampP_C (void)
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void R_DrawSpanMaskedAddClamp (void)
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{
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dsfixed_t xfrac;
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dsfixed_t yfrac;
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@ -2550,12 +2544,10 @@ const BYTE *R_GetColumn (FTexture *tex, int col)
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return tex->GetColumn (col, NULL);
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}
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// [RH] Initialize the column drawer pointers
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void R_InitColumnDrawers ()
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{
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#ifdef X86_ASM
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R_DrawColumn = R_DrawColumnP_ASM;
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R_DrawColumnHoriz = R_DrawColumnHorizP_C;
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R_DrawFuzzColumn = R_DrawFuzzColumnP_ASM;
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R_DrawTranslatedColumn = R_DrawTranslatedColumnP_C;
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@ -2572,7 +2564,6 @@ void R_InitColumnDrawers ()
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}
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#else
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R_DrawColumnHoriz = R_DrawColumnHorizP_C;
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R_DrawColumn = R_DrawColumnP_C;
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R_DrawFuzzColumn = R_DrawFuzzColumnP_C;
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R_DrawTranslatedColumn = R_DrawTranslatedColumnP_C;
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R_DrawShadedColumn = R_DrawShadedColumnP_C;
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@ -2580,10 +2571,6 @@ void R_InitColumnDrawers ()
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R_DrawSpanMasked = R_DrawSpanMaskedP_C;
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rt_map4cols = rt_map4cols_c;
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#endif
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R_DrawSpanTranslucent = R_DrawSpanTranslucentP_C;
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R_DrawSpanMaskedTranslucent = R_DrawSpanMaskedTranslucentP_C;
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R_DrawSpanAddClamp = R_DrawSpanAddClampP_C;
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R_DrawSpanMaskedAddClamp = R_DrawSpanMaskedAddClampP_C;
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}
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// [RH] Choose column drawers in a single place
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17
src/r_draw.h
17
src/r_draw.h
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@ -65,7 +65,6 @@ extern "C" unsigned int horizspans[4];
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// The span blitting interface.
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// Hook in assembler or system specific BLT here.
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extern void (*R_DrawColumn)(void);
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extern DWORD (*dovline1) ();
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extern DWORD (*doprevline1) ();
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@ -103,16 +102,16 @@ void R_SetSpanSource(const BYTE *pixels);
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extern void (*R_DrawSpanMasked)(void);
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// Span drawing for translucent textures.
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extern void (*R_DrawSpanTranslucent)(void);
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void R_DrawSpanTranslucent(void);
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// Span drawing for masked, translucent textures.
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extern void (*R_DrawSpanMaskedTranslucent)(void);
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void R_DrawSpanMaskedTranslucent(void);
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// Span drawing for translucent, additive textures.
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extern void (*R_DrawSpanAddClamp)(void);
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void R_DrawSpanAddClamp(void);
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// Span drawing for masked, translucent, additive textures.
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extern void (*R_DrawSpanMaskedAddClamp)(void);
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void R_DrawSpanMaskedAddClamp(void);
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// [RH] Span blit into an interleaved intermediate buffer
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extern void (*R_DrawColumnHoriz)(void);
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@ -193,8 +192,6 @@ void R_DrawFogBoundary (int x1, int x2, short *uclip, short *dclip);
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#ifdef X86_ASM
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extern "C" void R_DrawColumnP_Unrolled (void);
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extern "C" void R_DrawColumnP_ASM (void);
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extern "C" void R_DrawFuzzColumnP_ASM (void);
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void R_DrawShadedColumnP_C (void);
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extern "C" void R_DrawSpanP_ASM (void);
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@ -204,7 +201,6 @@ void R_DrawColumnHorizP_C(void);
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#else
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void R_DrawColumnP_C (void);
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void R_DrawFuzzColumnP_C (void);
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void R_DrawShadedColumnP_C (void);
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void R_DrawSpanP_C (void);
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@ -212,10 +208,11 @@ void R_DrawSpanMaskedP_C (void);
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#endif
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void R_DrawColumn();
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void R_DrawColumnHorizP_C(void);
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void R_DrawTranslatedColumnP_C(void);
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void R_DrawSpanTranslucentP_C (void);
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void R_DrawSpanMaskedTranslucentP_C (void);
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void R_DrawSpanTranslucent (void);
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void R_DrawSpanMaskedTranslucent (void);
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void R_DrawTlatedLucentColumnP_C (void);
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#define R_DrawTlatedLucentColumn R_DrawTlatedLucentColumnP_C
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