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Optimizations and tweaks for C replacements of mhline and thline.

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Hlines for masked and translucent masked ceiling/floor (sprites).

- apply the --> 'do { ... } while (--cnt)' transformation, making these
  functions iterate cnt+1 times like the asm version.  This also fixes an
  off-by-one issue where sprites or masked ceilings/floors had a one-pixel
  non-drawn line to the right.
- This time, only declare-as-local two 'extern' globals (asm1 and asm2).
  It seems that I was too eager with "localing" all file-scoped vars earlier.
  GCC is able to remove the loads from memory inside the loop by itself, whereas
  clang is not. This is not trivial, since it has to prove that the 'screen'
  pointer passed to the functions will never alias these globals.

git-svn-id: https://svn.eduke32.com/eduke32@2424 1a8010ca-5511-0410-912e-c29ae57300e0
This commit is contained in:
helixhorned 2012-03-07 19:42:37 +00:00
parent aa89dc6725
commit dca9d1357c
1 changed files with 27 additions and 11 deletions
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38
polymer/eduke32/build/src/a-c.c
View file

@ -169,54 +169,70 @@ void tvlineasm1(int32_t vinc, intptr_t paloffs, int32_t cnt, uint32_t vplc, intp
//Floor sprite horizontal line functions
void msethlineshift(int32_t logx, int32_t logy) { glogx = logx; glogy = logy; }
// cntup16>>16 + 1 iterations
void mhline(intptr_t bufplc, uint32_t bx, int32_t cntup16, int32_t junk, uint32_t by, intptr_t p)
{
char ch;
const int32_t xinc = asm1, yinc = asm2;
UNREFERENCED_PARAMETER(junk);
gbuf = (char *)bufplc;
gpal = (char *)asm3;
for (cntup16>>=16; cntup16>0; cntup16--)
cntup16>>=16;
cntup16++;
do
{
ch = gbuf[((bx>>(32-glogx))<<glogy)+(by>>(32-glogy))];
if (ch != 255) *((char *)p) = gpal[ch];
bx += asm1;
by += asm2;
bx += xinc;
by += yinc;
p++;
}
while (--cntup16);
}
void tsethlineshift(int32_t logx, int32_t logy) { glogx = logx; glogy = logy; }
// cntup16>>16 + 1 iterations
void thline(intptr_t bufplc, uint32_t bx, int32_t cntup16, int32_t junk, uint32_t by, intptr_t p)
{
char ch;
const int32_t xinc = asm1, yinc = asm2;
UNREFERENCED_PARAMETER(junk);
gbuf = (char *)bufplc;
gpal = (char *)asm3;
cntup16>>=16;
cntup16++;
if (transmode)
{
for (cntup16>>=16; cntup16>0; cntup16--)
do
{
ch = gbuf[((bx>>(32-glogx))<<glogy)+(by>>(32-glogy))];
if (ch != 255) *((char *)p) = gtrans[(*((char *)p))+(gpal[ch]<<8)];
bx += asm1;
by += asm2;
if (ch != 255) *((char *)p) = gtrans[(*((char *)p))|(gpal[ch]<<8)];
bx += xinc;
by += yinc;
p++;
}
while (--cntup16);
}
else
{
for (cntup16>>=16; cntup16>0; cntup16--)
do
{
ch = gbuf[((bx>>(32-glogx))<<glogy)+(by>>(32-glogy))];
if (ch != 255) *((char *)p) = gtrans[((*((char *)p))<<8)+gpal[ch]];
bx += asm1;
by += asm2;
if (ch != 255) *((char *)p) = gtrans[((*((char *)p))<<8)|gpal[ch]];
bx += xinc;
by += yinc;
p++;
}
while (--cntup16);
}
}