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Improve flat mipmap selection

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This commit is contained in:
Magnus Norddahl 2016-11-06 11:39:28 +01:00
parent aad2cde332
commit 3a7532fd9b
4 changed files with 18 additions and 11 deletions
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1
src/r_draw.cpp
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@ -1046,6 +1046,7 @@ dsfixed_t ds_xstep;
dsfixed_t ds_ystep;
int ds_xbits;
int ds_ybits;
double ds_lod;
// start of a floor/ceiling tile image
const BYTE* ds_source;

1
src/r_draw.h
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@ -316,6 +316,7 @@ extern "C" dsfixed_t ds_ystep;
extern "C" int ds_xbits;
extern "C" int ds_ybits;
extern "C" fixed_t ds_alpha;
extern "C" double ds_lod;
// start of a 64*64 tile image
extern "C" const BYTE* ds_source;

17
src/r_draw_rgba.cpp
View file

@ -97,7 +97,7 @@ public:
args.flags = 0;
if (ds_shade_constants.simple_shade)
args.flags |= DrawSpanArgs::simple_shade;
if (!sampler_setup(args.source, args.xbits, args.ybits, args.xstep, args.ystep, ds_source_mipmapped))
if (!sampler_setup(args.source, args.xbits, args.ybits, ds_source_mipmapped))
args.flags |= DrawSpanArgs::nearest_filter;
}
@ -117,18 +117,13 @@ protected:
DrawSpanArgs args;
private:
inline static bool sampler_setup(const uint32_t * &source, int &xbits, int &ybits, fixed_t xstep, fixed_t ystep, bool mipmapped)
inline static bool sampler_setup(const uint32_t * &source, int &xbits, int &ybits, bool mipmapped)
{
// Is this a magfilter or minfilter?
fixed_t xmagnitude = abs(xstep) >> (32 - xbits - FRACBITS);
fixed_t ymagnitude = abs(ystep) >> (32 - ybits - FRACBITS);
fixed_t magnitude = (xmagnitude + ymagnitude) * 2 + (1 << (FRACBITS - 1));
bool magnifying = (magnitude >> FRACBITS == 0);
bool magnifying = ds_lod < 0.0f;
if (r_mipmap && mipmapped)
{
int level = magnitude >> (FRACBITS + 1);
while (level != 0)
int level = (int)ds_lod;
while (level > 0)
{
if (xbits <= 2 || ybits <= 2)
break;
@ -136,7 +131,7 @@ private:
source += (1 << (xbits)) * (1 << (ybits));
xbits -= 1;
ybits -= 1;
level >>= 1;
level--;
}
}

10
src/r_plane.cpp
View file

@ -245,6 +245,16 @@ void R_MapPlane (int y, int x1)
ds_yfrac = 0;
}
if (r_swtruecolor)
{
double distance2 = planeheight * yslope[(y + 1 < viewheight) ? y + 1 : y - 1];
double xmagnitude = fabs(ystepscale * (distance2 - distance) * FocalLengthX);
double ymagnitude = fabs(xstepscale * (distance2 - distance) * FocalLengthX);
double magnitude = MAX(ymagnitude, xmagnitude);
double min_lod = -1000.0;
ds_lod = MAX(log2(magnitude) + r_lod_bias, min_lod);
}
if (plane_shade)
{
// Determine lighting based on the span's distance from the viewer.