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powervr2.cpp: reduce number of divisions in render_hline

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This commit is contained in:
snickerbockers 2018-07-31 04:46:29 -07:00
parent 01b1422c26
commit 13bdaf3b66
1 changed files with 16 additions and 16 deletions
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32
src/mame/video/powervr2.cpp
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@ -2356,12 +2356,7 @@ inline void powervr2_device::render_hline(bitmap_rgb32 &bitmap, texinfo *ti, int
uint32_t *tdata;
float *wbufline;
// untextured cases aren't handled
// if (!ti->textured) return;
float bl[4], offl[4];
memcpy(bl, bl_in, sizeof(bl));
memcpy(offl, offl_in, sizeof(offl));
if(xr < 0 || xl >= 640)
return;
@ -2372,23 +2367,28 @@ inline void powervr2_device::render_hline(bitmap_rgb32 &bitmap, texinfo *ti, int
if(xxl == xxr)
return;
memcpy(bl, bl_in, sizeof(bl));
memcpy(offl, offl_in, sizeof(offl));
dx = xr-xl;
dudx = (ur-ul)/dx;
dvdx = (vr-vl)/dx;
dwdx = (wr-wl)/dx;
float dx_recip = 1.0f / dx;
dudx = (ur-ul) * dx_recip;
dvdx = (vr-vl) * dx_recip;
dwdx = (wr-wl) * dx_recip;
float dbdx[4] = {
(br_in[0] - bl[0]) / dx,
(br_in[1] - bl[1]) / dx,
(br_in[2] - bl[2]) / dx,
(br_in[3] - bl[3]) / dx
(br_in[0] - bl[0]) * dx_recip,
(br_in[1] - bl[1]) * dx_recip,
(br_in[2] - bl[2]) * dx_recip,
(br_in[3] - bl[3]) * dx_recip
};
float dodx[4] = {
(offr_in[0] - offl[0]) / dx,
(offr_in[1] - offl[1]) / dx,
(offr_in[2] - offl[2]) / dx,
(offr_in[3] - offl[3]) / dx
(offr_in[0] - offl[0]) * dx_recip,
(offr_in[1] - offl[1]) * dx_recip,
(offr_in[2] - offl[2]) * dx_recip,
(offr_in[3] - offl[3]) * dx_recip
};
if(xxl < 0)