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Implement optimized pixel-art antialiasing mode for non-integer world zoom.

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This commit is contained in:
Paul Chote
2019-11-24 15:27:51 +00:00
committed by tovl
parent cd368b43df
commit 860117daf9
3 changed files with 47 additions and 1 deletions
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37
glsl/combined.frag
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@@ -16,6 +16,7 @@ uniform sampler2D Palette;
uniform bool EnableDepthPreview;
uniform float DepthTextureScale;
uniform float AntialiasPixelsPerTexel;
in vec4 vTexCoord;
in vec2 vTexMetadata;
@@ -44,6 +45,24 @@ float jet_b(float x)
return x < 0.3 ? 4.0 * x + 0.5 : -4.0 * x + 2.5;
}
ivec2 Size(float samplerIndex)
{
if (samplerIndex < 0.5)
return textureSize(Texture0, 0);
else if (samplerIndex < 1.5)
return textureSize(Texture1, 0);
else if (samplerIndex < 2.5)
return textureSize(Texture2, 0);
else if (samplerIndex < 3.5)
return textureSize(Texture3, 0);
else if (samplerIndex < 4.5)
return textureSize(Texture4, 0);
else if (samplerIndex < 5.5)
return textureSize(Texture5, 0);
return textureSize(Texture6, 0);
}
vec4 Sample(float samplerIndex, vec2 pos)
{
if (samplerIndex < 0.5)
@@ -64,7 +83,23 @@ vec4 Sample(float samplerIndex, vec2 pos)
void main()
{
vec4 x = Sample(vTexSampler.s, vTexCoord.st);
vec2 coords = vTexCoord.st;
if (AntialiasPixelsPerTexel > 0)
{
vec2 textureSize = Size(vTexSampler.s);
vec2 offset = fract(coords.st * textureSize);
// Offset the sampling point to simulate bilinear intepolation in window coordinates instead of texture coordinates
// https://csantosbh.wordpress.com/2014/01/25/manual-texture-filtering-for-pixelated-games-in-webgl/
// https://csantosbh.wordpress.com/2014/02/05/automatically-detecting-the-texture-filter-threshold-for-pixelated-magnifications/
// ik is defined as 1/k from the articles, set to 1/0.7 because it looks good
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;
}
vec4 x = Sample(vTexSampler.s, coords);
vec2 p = vec2(dot(x, vChannelMask), vTexMetadata.s);
vec4 c = vPalettedFraction * texture(Palette, p) + vRGBAFraction * x + vColorFraction * vTexCoord;