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Significantly speed up non-power-of-two floor sprite texture mapping functions.

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(Classic renderer). We don't need 64-bit integers; also use the nice
asm version of divscale32() if possible.

git-svn-id: https://svn.eduke32.com/eduke32@2390 1a8010ca-5511-0410-912e-c29ae57300e0
This commit is contained in:
helixhorned 2012-02-27 19:40:01 +00:00
parent 4f4ca00231
commit 95324450fa
1 changed files with 21 additions and 3 deletions
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24
polymer/eduke32/build/src/engine.c
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@ -3905,7 +3905,19 @@ static inline void transmaskwallscan(int32_t x1, int32_t x2)
faketimerhandler();
}
////////// NON-power-of-two replacements for mhline/thline, adapted from a.c //////////
#if defined(__GNUC__) && defined(__i386__) && !defined(NOASM)
// from pragmas.h
# define ourdivscale32(d,b) \
({ int32_t __d=(d), __b=(b), __r; \
__asm__ __volatile__ ("xorl %%eax, %%eax; idivl %%ebx" \
: "=a" (__r), "=d" (__d) : "d" (__d), "b" (__b) : "cc"); \
__r; })
#else
# define ourdivscale32(d,b) divscale32(d,b)
#endif
static void nonpow2_mhline(intptr_t bufplc, uint32_t bx, int32_t cntup16, int32_t junk, uint32_t by, intptr_t p)
{
char ch;
@ -3913,11 +3925,14 @@ static void nonpow2_mhline(intptr_t bufplc, uint32_t bx, int32_t cntup16, int32_
const char *const gbuf = (char *)bufplc;
const char *const gpal = (char *)asm3;
const uint32_t xdiv = globalxspan > 1 ? ourdivscale32(1, globalxspan) : UINT32_MAX;
const uint32_t ydiv = globalyspan > 1 ? ourdivscale32(1, globalyspan) : UINT32_MAX;
UNREFERENCED_PARAMETER(junk);
for (cntup16>>=16; cntup16>0; cntup16--)
{
ch = gbuf[(((uint64_t)bx)/((1ull<<32)/globalxspan))*globalyspan + ((uint64_t)by)/((1ull<<32)/globalyspan)];
ch = gbuf[(bx/xdiv)*globalyspan + by/ydiv];
if (ch != 255) *((char *)p) = gpal[ch];
bx += asm1;
by += asm2;
@ -3932,13 +3947,16 @@ static void nonpow2_thline(intptr_t bufplc, uint32_t bx, int32_t cntup16, int32_
const char *const gbuf = (char *)bufplc;
const char *const gpal = (char *)asm3;
const uint32_t xdiv = globalxspan > 1 ? ourdivscale32(1, globalxspan) : UINT32_MAX;
const uint32_t ydiv = globalyspan > 1 ? ourdivscale32(1, globalyspan) : UINT32_MAX;
UNREFERENCED_PARAMETER(junk);
if (globalorientation&512)
{
for (cntup16>>=16; cntup16>0; cntup16--)
{
ch = gbuf[(((uint64_t)bx)/((1ull<<32)/globalxspan))*globalyspan + ((uint64_t)by)/((1ull<<32)/globalyspan)];
ch = gbuf[(bx/xdiv)*globalyspan + by/ydiv];
if (ch != 255) *((char *)p) = transluc[(*((char *)p))+(gpal[ch]<<8)];
bx += asm1;
by += asm2;
@ -3949,7 +3967,7 @@ static void nonpow2_thline(intptr_t bufplc, uint32_t bx, int32_t cntup16, int32_
{
for (cntup16>>=16; cntup16>0; cntup16--)
{
ch = gbuf[(((uint64_t)bx)/((1ull<<32)/globalxspan))*globalyspan + ((uint64_t)by)/((1ull<<32)/globalyspan)];
ch = gbuf[(bx/xdiv)*globalyspan + by/ydiv];
if (ch != 255) *((char *)p) = transluc[((*((char *)p))<<8)+gpal[ch]];
bx += asm1;
by += asm2;