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Better fog block colouring

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They still aren't perfect, but now they are at least not quite so obviously just translucent polygons over the level. A mixture between partially modulating the background colours and adding the fog colour. Notably white fog blocks look like they're brightening what's behind them.
Additive was also setting noalphatest before, can probably decide that depending on what it needs anyway. I don't think it's currently used anyway.
This commit is contained in:
Sryder 2018-03-15 23:58:37 +00:00
parent e4ed3a793b
commit 5a4ea9fab3
3 changed files with 30 additions and 23 deletions
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5
src/hardware/hw_defs.h
View file

@ -133,12 +133,13 @@ enum EPolyFlags
PF_Masked = 0x00000001, // Poly is alpha scaled and 0 alpha pels are discarded (holes in texture)
PF_Translucent = 0x00000002, // Poly is transparent, alpha = level of transparency
PF_Additive = 0x00000024, // Poly is added to the frame buffer
PF_Additive = 0x00000004, // Poly is added to the frame buffer
PF_Environment = 0x00000008, // Poly should be drawn environment mapped.
// Hurdler: used for text drawing
PF_Substractive = 0x00000010, // for splat
PF_NoAlphaTest = 0x00000020, // hiden param
PF_Blending = (PF_Environment|PF_Additive|PF_Translucent|PF_Masked|PF_Substractive)&~PF_NoAlphaTest,
PF_Fog = 0x00000040, // Fog blocks
PF_Blending = (PF_Environment|PF_Additive|PF_Translucent|PF_Masked|PF_Substractive|PF_Fog)&~PF_NoAlphaTest,
// other flag bits

40
src/hardware/hw_main.c
View file

@ -489,10 +489,10 @@ UINT32 HWR_Lighting(INT32 light, UINT32 color, UINT32 fadecolor, boolean fogbloc
}
static UINT8 HWR_FogBlockAlpha(INT32 light, UINT32 color, UINT32 fadecolor) // Let's see if this can work
static UINT8 HWR_FogBlockAlpha(INT32 light, UINT32 color) // Let's see if this can work
{
RGBA_t realcolor, fogcolor, surfcolor;
INT32 alpha, fogalpha;
RGBA_t realcolor, surfcolor;
INT32 alpha;
// Don't go out of bounds
if (light < 0)
@ -501,13 +501,11 @@ static UINT8 HWR_FogBlockAlpha(INT32 light, UINT32 color, UINT32 fadecolor) // L
light = 255;
realcolor.rgba = color;
fogcolor.rgba = fadecolor;
alpha = (realcolor.s.alpha*255)/25;
fogalpha = (fogcolor.s.alpha*255)/25;
// Fog blocks seem to get slightly more opaque with more opaque colourmap opacity, and much more opaque with darker brightness
surfcolor.s.alpha = (UINT8)(CALCLIGHT(light, ((0xFF-light)+alpha)/2)+CALCLIGHT(0xFF-light, ((light)+fogalpha)/2));
// at 255 brightness, alpha is between 0 and 127, at 0 brightness alpha will always be 255
surfcolor.s.alpha = (alpha*light)/(2*256)+255-light;
return surfcolor.s.alpha;
}
@ -773,7 +771,7 @@ static void HWR_RenderPlane(sector_t *sector, extrasubsector_t *xsub, boolean is
Surf.FlatColor.rgba = HWR_Lighting(lightlevel, NORMALFOG, FADEFOG, false, true);
}
if (PolyFlags & PF_Translucent)
if (PolyFlags & (PF_Translucent|PF_Fog))
{
Surf.FlatColor.s.alpha = (UINT8)alpha;
PolyFlags |= PF_Modulated|PF_Occlude|PF_Clip;
@ -1380,7 +1378,7 @@ static void HWR_SplitFog(sector_t *sector, wallVert3D *wallVerts, FSurfaceInfo*
wallVerts[0].y = wallVerts[1].y = bot;
if (!solid) // Don't draw it if there's more fog behind it
HWR_AddTransparentWall(wallVerts, Surf, 0, PF_Translucent|PF_NoTexture, true, lightnum, colormap);
HWR_AddTransparentWall(wallVerts, Surf, 0, PF_Fog|PF_NoTexture, true, lightnum, colormap);
top = height;
}
@ -2306,7 +2304,7 @@ static void HWR_StoreWallRange(double startfrac, double endfrac)
{
FBITFIELD blendmode;
blendmode = PF_Translucent|PF_NoTexture;
blendmode = PF_Fog|PF_NoTexture;
lightnum = rover->master->frontsector->lightlevel;
colormap = rover->master->frontsector->extra_colormap;
@ -2314,11 +2312,11 @@ static void HWR_StoreWallRange(double startfrac, double endfrac)
if (rover->master->frontsector->extra_colormap)
{
Surf.FlatColor.s.alpha = HWR_FogBlockAlpha(rover->master->frontsector->lightlevel,rover->master->frontsector->extra_colormap->rgba,rover->master->frontsector->extra_colormap->fadergba);
Surf.FlatColor.s.alpha = HWR_FogBlockAlpha(rover->master->frontsector->lightlevel,rover->master->frontsector->extra_colormap->rgba);
}
else
{
Surf.FlatColor.s.alpha = HWR_FogBlockAlpha(rover->master->frontsector->lightlevel,NORMALFOG,FADEFOG);
Surf.FlatColor.s.alpha = HWR_FogBlockAlpha(rover->master->frontsector->lightlevel,NORMALFOG);
}
if (gr_frontsector->numlights)
@ -2426,18 +2424,18 @@ static void HWR_StoreWallRange(double startfrac, double endfrac)
{
FBITFIELD blendmode;
blendmode = PF_Translucent|PF_NoTexture;
blendmode = PF_Fog|PF_NoTexture;
lightnum = rover->master->frontsector->lightlevel;
colormap = rover->master->frontsector->extra_colormap;
if (rover->master->frontsector->extra_colormap)
{
Surf.FlatColor.s.alpha = HWR_FogBlockAlpha(rover->master->frontsector->lightlevel,rover->master->frontsector->extra_colormap->rgba,rover->master->frontsector->extra_colormap->fadergba);
Surf.FlatColor.s.alpha = HWR_FogBlockAlpha(rover->master->frontsector->lightlevel,rover->master->frontsector->extra_colormap->rgba);
}
else
{
Surf.FlatColor.s.alpha = HWR_FogBlockAlpha(rover->master->frontsector->lightlevel,NORMALFOG,FADEFOG);
Surf.FlatColor.s.alpha = HWR_FogBlockAlpha(rover->master->frontsector->lightlevel,NORMALFOG);
}
if (gr_backsector->numlights)
@ -3547,16 +3545,16 @@ static void HWR_Subsector(size_t num)
light = R_GetPlaneLight(gr_frontsector, centerHeight, dup_viewz < cullHeight ? true : false);
if (rover->master->frontsector->extra_colormap)
alpha = HWR_FogBlockAlpha(*gr_frontsector->lightlist[light].lightlevel, rover->master->frontsector->extra_colormap->rgba, rover->master->frontsector->extra_colormap->fadergba);
alpha = HWR_FogBlockAlpha(*gr_frontsector->lightlist[light].lightlevel, rover->master->frontsector->extra_colormap->rgba);
else
alpha = HWR_FogBlockAlpha(*gr_frontsector->lightlist[light].lightlevel, NORMALFOG, FADEFOG);
alpha = HWR_FogBlockAlpha(*gr_frontsector->lightlist[light].lightlevel, NORMALFOG);
HWR_AddTransparentFloor(0,
&extrasubsectors[num],
false,
*rover->bottomheight,
*gr_frontsector->lightlist[light].lightlevel,
alpha, rover->master->frontsector, PF_Translucent|PF_NoTexture,
alpha, rover->master->frontsector, PF_Fog|PF_NoTexture,
true, rover->master->frontsector->extra_colormap);
}
else if (rover->flags & FF_TRANSLUCENT && rover->alpha < 256) // SoM: Flags are more efficient
@ -3610,16 +3608,16 @@ static void HWR_Subsector(size_t num)
light = R_GetPlaneLight(gr_frontsector, centerHeight, dup_viewz < cullHeight ? true : false);
if (rover->master->frontsector->extra_colormap)
alpha = HWR_FogBlockAlpha(*gr_frontsector->lightlist[light].lightlevel, rover->master->frontsector->extra_colormap->rgba, rover->master->frontsector->extra_colormap->fadergba);
alpha = HWR_FogBlockAlpha(*gr_frontsector->lightlist[light].lightlevel, rover->master->frontsector->extra_colormap->rgba);
else
alpha = HWR_FogBlockAlpha(*gr_frontsector->lightlist[light].lightlevel, NORMALFOG, FADEFOG);
alpha = HWR_FogBlockAlpha(*gr_frontsector->lightlist[light].lightlevel, NORMALFOG);
HWR_AddTransparentFloor(0,
&extrasubsectors[num],
true,
*rover->topheight,
*gr_frontsector->lightlist[light].lightlevel,
alpha, rover->master->frontsector, PF_Translucent|PF_NoTexture,
alpha, rover->master->frontsector, PF_Fog|PF_NoTexture,
true, rover->master->frontsector->extra_colormap);
}
else if (rover->flags & FF_TRANSLUCENT && rover->alpha < 256)

8
src/hardware/r_opengl/r_opengl.c
View file

@ -1187,6 +1187,14 @@ EXPORT void HWRAPI(SetBlend) (FBITFIELD PolyFlags)
pglBlendFunc(GL_ZERO, GL_ONE_MINUS_SRC_COLOR);
#ifndef KOS_GL_COMPATIBILITY
pglAlphaFunc(GL_NOTEQUAL, 0.0f);
#endif
break;
case PF_Fog & PF_Fog:
// Sryder: Fog
// multiplies input colour by input alpha, and destination colour by input colour, then adds them
pglBlendFunc(GL_SRC_ALPHA, GL_SRC_COLOR);
#ifndef KOS_GL_COMPATIBILITY
pglAlphaFunc(GL_NOTEQUAL, 0.0f);
#endif
break;
default : // must be 0, otherwise it's an error