mirror of
https://github.com/ZDoom/Raze.git
synced 2024-11-26 05:51:30 +00:00
79 lines
2.4 KiB
GLSL
79 lines
2.4 KiB
GLSL
const int RF_ShadeInterpolate = 64;
|
|
|
|
const float pixleHalf = (1.0 / 256.0) / 2.0; // Half way through a pixel on 256 sized image
|
|
const float pixleIndexScale = 255.0 / 256.0;
|
|
|
|
vec4 getColor(float palindex, float shadeindex)
|
|
{
|
|
float colorIndexF = texture2D(texture3, vec2(palindex, shadeindex)).a;
|
|
vec4 palettedColor = texture2D(texture2, vec2((colorIndexF * pixleIndexScale) + pixleHalf, 0.5));
|
|
|
|
return palettedColor;
|
|
}
|
|
|
|
vec4 ProcessTexel()
|
|
{
|
|
float fullbright = 0.0;
|
|
vec4 color;
|
|
float coordX = vTexCoord.x;
|
|
float coordY = vTexCoord.y;
|
|
vec2 newCoord;
|
|
|
|
// z is the depth in view space, positive going into the screen
|
|
float z = abs(pixelpos.w);
|
|
|
|
#ifdef NPOT_EMULATION
|
|
// Coordinate adjustment for NPOT textures. It is somehow fitting that Build games exploited this texture wrapping quirk of the software rendering engine...
|
|
#if (DEF_NPOT_EMULATION == 1)
|
|
float period = floor(coordY / uNpotEmulation.y);
|
|
coordX += uNpotEmulation.x * floor(mod(coordY, uNpotEmulation.y));
|
|
coordY = period + mod(coordY, uNpotEmulation.y);
|
|
#endif
|
|
|
|
#endif
|
|
|
|
newCoord = vec2(coordX, coordY);
|
|
color = texture2D(tex, newCoord);
|
|
|
|
#if (DEF_PALETTE_INTERPOLATE == 1)
|
|
float visibility = max(uGlobVis * uLightFactor * z - 0.5, 0.0);
|
|
#else
|
|
float visibility = max(uGlobVis * uLightFactor * z, 0.0);
|
|
#endif
|
|
|
|
|
|
float numShades = float(uPalLightLevels);
|
|
float shade = (1.0 - uLightLevel) * (numShades);
|
|
shade = clamp((shade + visibility), 0.0, numShades - 1.0);
|
|
|
|
float palindex = (color.a * pixleIndexScale) + pixleHalf;
|
|
float shadeindex = (shade / (numShades)) + pixleHalf;
|
|
|
|
vec4 palettedColor = getColor(palindex, shadeindex);
|
|
|
|
|
|
#if (DEF_PALETTE_INTERPOLATE == 1)
|
|
// Get the next shaded palette index for interpolation
|
|
shadeindex = ((shade + 1.0) / (numShades));
|
|
shadeindex = clamp(shadeindex, 0.0, 1.0);
|
|
|
|
vec4 palettedColorNext = getColor(palindex, shadeindex);
|
|
|
|
float shadeFrac = mod(shade, 1.0);
|
|
palettedColor.rgb = mix(palettedColor.rgb, palettedColorNext.rgb, shadeFrac);
|
|
#endif
|
|
|
|
|
|
//palettedColor.a = color.a == 0.0? 0.0 : 1.0;
|
|
// Replaces above line without branch
|
|
palettedColor.a = floor(color.a + 0.999);
|
|
|
|
color = palettedColor;
|
|
|
|
//if (color.a < uAlphaThreshold) discard; // it's only here that we have the alpha value available to be able to perform the alpha test.
|
|
// This replaces the above line to avoid the branch and the discard.. Seems to look the same but could be unforeseen issues.
|
|
float alpha = step(uAlphaThreshold, color.a);
|
|
|
|
return vec4(color.rgb, alpha);
|
|
}
|
|
|