From 147221cf6e67f8d0a4260a265127030efbd880b3 Mon Sep 17 00:00:00 2001 From: Monster Iestyn Date: Mon, 25 Mar 2019 18:54:47 +0000 Subject: [PATCH] R_RenderThickSideRange: clamp lights that fail overflow test, rather than skipping them. --- src/r_segs.c | 37 ++++++++++++++++++++----------------- 1 file changed, 20 insertions(+), 17 deletions(-) diff --git a/src/r_segs.c b/src/r_segs.c index 74836526..7495d788 100644 --- a/src/r_segs.c +++ b/src/r_segs.c @@ -862,16 +862,18 @@ void R_RenderThickSideRange(drawseg_t *ds, INT32 x1, INT32 x2, ffloor_t *pfloor) leftheight -= viewz; rightheight -= viewz; -#define OVERFLOWTEST(height, scale) \ - overflow_test = (INT64)centeryfrac - (((INT64)height*scale)>>FRACBITS); \ - if (overflow_test < 0) overflow_test = -overflow_test; \ - if ((UINT64)overflow_test&0xFFFFFFFF80000000ULL) continue; +#define CLAMPMAX INT32_MAX +#define CLAMPMIN (-INT32_MAX) // This is not INT32_MIN on purpose! INT32_MIN makes the drawers freak out. + // Monster Iestyn (25/03/18): do not skip these lights if they fail overflow test, just clamp them instead so they behave. + overflow_test = (INT64)centeryfrac - (((INT64)leftheight*ds->scale1)>>FRACBITS); + if (overflow_test > (INT64)CLAMPMAX) rlight->height = CLAMPMAX; + else if (overflow_test > (INT64)CLAMPMIN) rlight->height = (fixed_t)overflow_test; + else rlight->height = CLAMPMIN; - OVERFLOWTEST(leftheight, ds->scale1) - OVERFLOWTEST(rightheight, ds->scale2) - - rlight->height = (centeryfrac) - FixedMul(leftheight, ds->scale1); - rlight->heightstep = (centeryfrac) - FixedMul(rightheight, ds->scale2); + overflow_test = (INT64)centeryfrac - (((INT64)rightheight*ds->scale2)>>FRACBITS); + if (overflow_test > (INT64)CLAMPMAX) rlight->heightstep = CLAMPMAX; + else if (overflow_test > (INT64)CLAMPMIN) rlight->heightstep = (fixed_t)overflow_test; + else rlight->heightstep = CLAMPMIN; rlight->heightstep = (rlight->heightstep-rlight->height)/(range); #else if (light->height < *pfloor->bottomheight) @@ -893,12 +895,16 @@ void R_RenderThickSideRange(drawseg_t *ds, INT32 x1, INT32 x2, ffloor_t *pfloor) leftheight -= viewz; rightheight -= viewz; - OVERFLOWTEST(leftheight, ds->scale1) - OVERFLOWTEST(rightheight, ds->scale2) -#undef OVERFLOWTEST + // Monster Iestyn (25/03/18): do not skip these lights if they fail overflow test, just clamp them instead so they behave. + overflow_test = (INT64)centeryfrac - (((INT64)leftheight*ds->scale1)>>FRACBITS); + if (overflow_test > (INT64)CLAMPMAX) rlight->botheight = CLAMPMAX; + else if (overflow_test > (INT64)CLAMPMIN) rlight->botheight = (fixed_t)overflow_test; + else rlight->botheight = CLAMPMIN; - rlight->botheight = (centeryfrac) - FixedMul(leftheight, ds->scale1); - rlight->botheightstep = (centeryfrac) - FixedMul(rightheight, ds->scale2); + overflow_test = (INT64)centeryfrac - (((INT64)rightheight*ds->scale2)>>FRACBITS); + if (overflow_test > (INT64)CLAMPMAX) rlight->botheightstep = CLAMPMAX; + else if (overflow_test > (INT64)CLAMPMIN) rlight->botheightstep = (fixed_t)overflow_test; + else rlight->botheightstep = CLAMPMIN; rlight->botheightstep = (rlight->botheightstep-rlight->botheight)/(range); #else lheight = *light->caster->bottomheight;// > *pfloor->topheight ? *pfloor->topheight + FRACUNIT : *light->caster->bottomheight; @@ -1071,9 +1077,6 @@ void R_RenderThickSideRange(drawseg_t *ds, INT32 x1, INT32 x2, ffloor_t *pfloor) } #endif -#define CLAMPMAX INT32_MAX -#define CLAMPMIN (-INT32_MAX) // This is not INT32_MIN on purpose! INT32_MIN makes the drawers freak out. - // draw the columns for (dc_x = x1; dc_x <= x2; dc_x++) {