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Add antialiasing support for paletted sprites.

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This commit is contained in:
Paul Chote
2019-12-25 16:45:19 +00:00
committed by abcdefg30
parent bd4724842c
commit 1f849e9f7d
1 changed files with 30 additions and 3 deletions
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33
glsl/combined.frag
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@@ -81,10 +81,31 @@ vec4 Sample(float samplerIndex, vec2 pos)
return texture(Texture6, pos);
}
vec4 SamplePalettedBilinear(float samplerIndex, vec2 coords, vec2 textureSize)
{
vec2 texPos = (coords * textureSize) - vec2(0.5);
vec2 interp = fract(texPos);
vec2 tl = (floor(texPos) + vec2(0.5)) / textureSize;
vec2 px = 1.0 / textureSize;
vec4 x1 = Sample(samplerIndex, tl);
vec4 x2 = Sample(samplerIndex, tl + vec2(px.x, 0.));
vec4 x3 = Sample(samplerIndex, tl + vec2(0., px.y));
vec4 x4 = Sample(samplerIndex, tl + px);
vec4 c1 = texture(Palette, vec2(dot(x1, vChannelMask), vTexMetadata.s));
vec4 c2 = texture(Palette, vec2(dot(x2, vChannelMask), vTexMetadata.s));
vec4 c3 = texture(Palette, vec2(dot(x3, vChannelMask), vTexMetadata.s));
vec4 c4 = texture(Palette, vec2(dot(x4, vChannelMask), vTexMetadata.s));
return mix(mix(c1, c2, interp.x), mix(c3, c4, interp.x), interp.y);
}
void main()
{
vec2 coords = vTexCoord.st;
vec4 c;
if (AntialiasPixelsPerTexel > 0.0)
{
vec2 textureSize = vec2(Size(vTexSampler.s));
@@ -97,11 +118,17 @@ void main()
float ik = 1.43;
vec2 interp = clamp(offset * ik * AntialiasPixelsPerTexel, 0.0, .5) + clamp((offset - 1.0) * ik * AntialiasPixelsPerTexel + .5, 0.0, .5);
coords = (floor(coords.st * textureSize) + interp) / textureSize;
if (vPalettedFraction.x > 0.0)
c = SamplePalettedBilinear(vTexSampler.s, coords, textureSize);
}
vec4 x = Sample(vTexSampler.s, coords);
vec2 p = vec2(dot(x, vChannelMask), vTexMetadata.s);
vec4 c = vPalettedFraction * texture(Palette, p) + vRGBAFraction * x + vColorFraction * vTexCoord;
if (!(AntialiasPixelsPerTexel > 0.0 && vPalettedFraction.x > 0.0))
{
vec4 x = Sample(vTexSampler.s, coords);
vec2 p = vec2(dot(x, vChannelMask), vTexMetadata.s);
c = vPalettedFraction * texture(Palette, p) + vRGBAFraction * x + vColorFraction * vTexCoord;
}
// Discard any transparent fragments (both color and depth)
if (c.a == 0.0)