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Fix subpixel AA in pixel AA shader

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Isaac 2023-06-27 11:52:21 +02:00
parent ec36785410
commit 0830c831ce
1 changed files with 21 additions and 7 deletions
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28
interpolation/shaders/pixel_aa.slang
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@ -1,7 +1,7 @@
#version 450 #version 450
/* /*
Pixel AA v1.0 by fishku Pixel AA v1.1 by fishku
Copyright (C) 2023 Copyright (C) 2023
Public domain license (CC0) Public domain license (CC0)
@ -24,11 +24,12 @@
subpixel anti-aliasing, results are identical to the "pixellate" shader. subpixel anti-aliasing, results are identical to the "pixellate" shader.
Changelog: Changelog:
v1.1: Better subpixel sampling.
v1.0: Initial release. v1.0: Initial release.
*/ */
// clang-format off // clang-format off
#pragma parameter PIX_AA_SETTINGS "=== Pixel AA v1.0 settings ===" 0.0 0.0 1.0 1.0 #pragma parameter PIX_AA_SETTINGS "=== Pixel AA v1.1 settings ===" 0.0 0.0 1.0 1.0
#pragma parameter PIX_AA_SHARP "Pixel AA sharpening amount" 1.0 1.0 4.0 0.05 #pragma parameter PIX_AA_SHARP "Pixel AA sharpening amount" 1.0 1.0 4.0 0.05
#pragma parameter PIX_AA_GAMMA "Enable gamma-correct blending" 1.0 0.0 1.0 1.0 #pragma parameter PIX_AA_GAMMA "Enable gamma-correct blending" 1.0 0.0 1.0 1.0
#pragma parameter PIX_AA_SUBPX "Enable subpixel AA" 0.0 0.0 1.0 1.0 #pragma parameter PIX_AA_SUBPX "Enable subpixel AA" 0.0 0.0 1.0 1.0
@ -82,12 +83,15 @@ vec3 to_lin(vec3 x) { return pow(x, vec3(2.2)); }
vec3 to_srgb(vec3 x) { return pow(x, vec3(1.0 / 2.2)); } vec3 to_srgb(vec3 x) { return pow(x, vec3(1.0 / 2.2)); }
vec2 get_texel_size(vec2 pix_coord) {
return clamp(fwidth(pix_coord), 1.0e-5, 1.0);
}
// Params: // Params:
// pix_coord: Coordinate in source pixel coordinates // pix_coord: Coordinate in source pixel coordinates
// px_size_uv: 1 / source resolution // px_size_uv: 1 / source resolution
vec3 sample_aa(sampler2D tex, vec2 pix_coord, vec2 px_size_uv, vec3 sample_aa(sampler2D tex, vec2 pix_coord, vec2 px_size_uv,
bool gamma_correct, float sharpness) { bool gamma_correct, float sharpness, vec2 tx_size) {
const vec2 tx_size = clamp(fwidth(pix_coord), 1.0e-5, 1.0);
const vec2 tx_coord = pix_coord - 0.5 * tx_size; const vec2 tx_coord = pix_coord - 0.5 * tx_size;
const vec2 tx_coord_i = floor(tx_coord); const vec2 tx_coord_i = floor(tx_coord);
const vec2 tx_offset = const vec2 tx_offset =
@ -110,6 +114,13 @@ vec3 sample_aa(sampler2D tex, vec2 pix_coord, vec2 px_size_uv,
} }
} }
vec3 sample_aa(sampler2D tex, vec2 pix_coord, vec2 px_size_uv,
bool gamma_correct, float sharpness) {
const vec2 tx_size = get_texel_size(pix_coord);
return sample_aa(tex, pix_coord, px_size_uv, gamma_correct, sharpness,
tx_size);
}
void main() { void main() {
if (param.PIX_AA_SUBPX < 0.5) { if (param.PIX_AA_SUBPX < 0.5) {
FragColor = FragColor =
@ -124,9 +135,12 @@ void main() {
pix_coord + pix_coord +
vec2((param.PIX_AA_SUBPX_BGR < 0.5 ? i : -i) / 3.0, 0.0) * vec2((param.PIX_AA_SUBPX_BGR < 0.5 ? i : -i) / 3.0, 0.0) *
param.OutputSize.zw * param.SourceSize.xy; param.OutputSize.zw * param.SourceSize.xy;
FragColor[i + 1] = // With subpixel sampling, the sampling area is effectively reduced
sample_aa(Source, subpix_coord, param.SourceSize.zw, // to a third.
param.PIX_AA_GAMMA > 0.5, param.PIX_AA_SHARP)[i + 1]; const vec2 tx_size = get_texel_size(subpix_coord) / vec2(3.0, 1.0);
FragColor[i + 1] = sample_aa(
Source, subpix_coord, param.SourceSize.zw,
param.PIX_AA_GAMMA > 0.5, param.PIX_AA_SHARP, tx_size)[i + 1];
} }
FragColor[3] = 1.0; FragColor[3] = 1.0;
} }