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Fix depth calculations for R_DoomLightingEquation and make it an exact match of what zdoom does

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Magnus Norddahl 2016-07-23 16:30:28 +02:00 committed by Christoph Oelckers
parent 2cdc77de34
commit c08fc8f5a8
1 changed files with 23 additions and 22 deletions
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45
wadsrc/static/shaders/glsl/main.fp
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@ -117,34 +117,35 @@ vec4 getTexel(vec2 st)
//===========================================================================
//
// Doom lighting equation ripped from EDGE.
// Big thanks to EDGE developers for making the only port
// that actually replicates software renderer's lighting in OpenGL.
// Float version.
// Basically replace int with float and divide all constants by 31.
// Doom lighting equation exactly as calculated by zdoom.
//
//===========================================================================
float R_DoomLightingEquation(float light, float dist)
float R_DoomLightingEquation(float light)
{
// Changing this constant gives results very similar to changing r_visibility.
// Default is 232, it seems to give exactly the same light bands as software renderer.
#define DOOMLIGHTFACTOR 232.0
// Calculated from r_visibility. It differs between walls, floor and sprites.
//
// Wall: globVis = r_WallVisibility
// Floor: r_FloorVisibility / abs(plane.Zat0 - ViewPos.Z)
// Sprite: same as wall
// All are calculated in R_SetVisibility and seem to be decided by the
// aspect ratio amongst other things.
//
// 1706 is the value for walls on 1080p 16:9 displays.
float globVis = 1706.0;
/* L in the range 0 to 63 */
float L = light * 63.0/31.0;
/* L is the integer light level used in the game */
float L = light * 255.0;
float min_L = clamp(36.0/31.0 - L, 0.03, 1.0);
/* z is the depth in view/eye space, positive going into the screen */
float z = pixelpos.w;
// Fix objects getting totally black when close.
if (dist < 0.0001)
dist = 0.0001;
/* The zdoom light equation */
float vis = globVis / z;
float shade = 64.0 - (L + 12) * 32.0/128.0;
float lightscale = clamp((shade - min(24.0, vis)) / 32.0, 0.0, 31/32.0);
float scale = 1.0 / dist;
float index = (59.0/31.0 - L) - (scale * DOOMLIGHTFACTOR/31.0 - DOOMLIGHTFACTOR/31.0);
/* result is colormap index (0 bright .. 31 dark) */
return clamp(index, min_L, 1.0);
// Result is the normalized colormap index (0 bright .. 1 dark)
return lightscale;
}
//===========================================================================
@ -167,7 +168,7 @@ vec4 getLightColor(float fogdist, float fogfactor)
if (uLightLevel >= 0.0)
{
float newlightlevel = 1.0 - R_DoomLightingEquation(uLightLevel, gl_FragCoord.z);
float newlightlevel = 1.0 - R_DoomLightingEquation(uLightLevel);
color.rgb *= newlightlevel;
}
else if (uFogEnabled > 0)