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correct check for zstep

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This commit is contained in:
Denis Pauk 2018-09-04 22:51:08 +03:00
parent 6adc4cc81c
commit c45e1e7f8c
2 changed files with 18 additions and 10 deletions
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2
src/client/refresh/soft/sw_main.c
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@ -833,7 +833,7 @@ Returns an axially aligned box that contains the input box at the given rotation
=============
*/
static void
RotatedBBox (const vec3_t mins, const vec3_t maxs, const vec3_t angles, vec3_t tmins, vec3_t tmaxs)
RotatedBBox (const vec3_t mins, const vec3_t maxs, vec3_t angles, vec3_t tmins, vec3_t tmaxs)
{
vec3_t tmp, v;
int i, j;

26
src/client/refresh/soft/sw_scan.c
View file

@ -144,12 +144,14 @@ D_DrawZSpanGetStepValue(zvalue_t izistep)
{
// check that we can draw parallel surfaces to screen surface
// (both ends have same z value)
// current step too small to current screen width
if (izistep < (SHIFT16XYZ_MULT / vid.width))
return vid.width;
int count = 1;
// look to what is maxumum for current step
return SHIFT16XYZ_MULT / izistep;
while ((izistep * count) >> SHIFT16XYZ == 0 && count < vid.width)
{
count <<= 1;
}
return count;
}
/*
@ -744,7 +746,7 @@ void
D_DrawZSpans (espan_t *pspan)
{
zvalue_t izistep;
int safe_step;
int safe_step;
// FIXME: check for clamping/range problems
// we count on FP exceptions being turned off to avoid range problems
@ -771,13 +773,19 @@ D_DrawZSpans (espan_t *pspan)
// we count on FP exceptions being turned off to avoid range problems
izi = (int)(zi * 0x8000 * (float)SHIFT16XYZ_MULT);
if (safe_step > count)
if (safe_step > 1)
{
zvalue_t izi_shifted = izi >> SHIFT16XYZ;
const zvalue_t *tdest_max = pdest + count;
do
{
*pdest++ = izi_shifted;
int step;
zvalue_t izi_shifted = izi >> SHIFT16XYZ;
for(step = 0; (step < safe_step) && (pdest < tdest_max); step++)
{
*pdest++ = izi_shifted;
}
izi += (izistep * safe_step);
} while (pdest < tdest_max);
}
else