alex/slang-shaders
1
0
Fork 0
mirror of https://github.com/italicsjenga/slang-shaders.git synced 2024-11-22 15:51:30 +11:00
Code Issues Packages Projects Releases Wiki Activity

Optimize and simplify Pixel AA, Average Fill, and Blur Fill presets (#467)

Browse source 
* Simplify pixel AA; Dependents to be refactored

* Finish refactoring pixel_aa itself; Dependent presets TBD

* Update average and border fill

* Tune default blur strengths in blur fill

* Clean up includes

* Minor corrections
This commit is contained in:
fishcu 2023-07-29 23:32:34 +02:00 committed by GitHub
parent 89530c1dec
commit 6f921ee481
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
9 changed files with 141 additions and 150 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

4
border/blur_fill.slangp
View file

@ -27,8 +27,8 @@ wrap_mode2 = mirrored_repeat
shader3 = shaders/blur_fill/render_sampling_areas.slang shader3 = shaders/blur_fill/render_sampling_areas.slang
filter_linear3 = true filter_linear3 = true
scale_type3 = source scale_type3 = source
scale_x3 = 2.0 scale_x3 = 1.1
scale_y3 = 2.0 scale_y3 = 1.1
float_framebuffer3 = true float_framebuffer3 = true
alias3 = "Tiled" alias3 = "Tiled"

6
border/blur_fill_stronger_blur.slangp
View file

@ -1,7 +1,7 @@
shaders = 12 shaders = 12
parameters = "SIGMA;BLUR_RADIUS" parameters = "SIGMA;BLUR_RADIUS"
SIGMA = 2.0 SIGMA = 1.5
BLUR_RADIUS = 3.0 BLUR_RADIUS = 3.0
shader0 = ../blurs/shaders/kawase/linearize.slang shader0 = ../blurs/shaders/kawase/linearize.slang
@ -27,8 +27,8 @@ wrap_mode2 = mirrored_repeat
shader3 = shaders/blur_fill/render_sampling_areas.slang shader3 = shaders/blur_fill/render_sampling_areas.slang
filter_linear3 = true filter_linear3 = true
scale_type3 = source scale_type3 = source
scale_x3 = 1.0 scale_x3 = 0.7
scale_y3 = 1.0 scale_y3 = 0.7
float_framebuffer3 = true float_framebuffer3 = true
alias3 = "Tiled" alias3 = "Tiled"

4
border/blur_fill_weaker_blur.slangp
View file

@ -27,8 +27,8 @@ wrap_mode2 = mirrored_repeat
shader3 = shaders/blur_fill/render_sampling_areas.slang shader3 = shaders/blur_fill/render_sampling_areas.slang
filter_linear3 = true filter_linear3 = true
scale_type3 = source scale_type3 = source
scale_x3 = 3.0 scale_x3 = 2.0
scale_y3 = 3.0 scale_y3 = 2.0
float_framebuffer3 = true float_framebuffer3 = true
alias3 = "Tiled" alias3 = "Tiled"

69
border/shaders/average_fill/compose.slang
View file

@ -1,7 +1,7 @@
#version 450 #version 450
/* /*
Average fill v1.4 by fishku Average fill v1.5 by fishku
Copyright (C) 2023 Copyright (C) 2023
Public domain license (CC0) Public domain license (CC0)
@ -27,6 +27,7 @@
3 = Smooth angle-based blending 3 = Smooth angle-based blending
Changelog: Changelog:
v1.5: Optimize. Update to new Pixel AA version.
v1.4: Add anti-aliased interpolation for non-integer scaling. v1.4: Add anti-aliased interpolation for non-integer scaling.
v1.3: Fix scaling bugs. v1.3: Fix scaling bugs.
v1.2: Fix scaling bugs. v1.2: Fix scaling bugs.
@ -34,7 +35,10 @@
v1.0: Initial release. v1.0: Initial release.
*/ */
// clang-format off
#include "parameters.slang" #include "parameters.slang"
#include "../../../interpolation/shaders/pixel_aa/shared.slang"
// clang-format on
layout(push_constant) uniform Push { layout(push_constant) uniform Push {
vec4 InputSize; vec4 InputSize;
@ -69,14 +73,24 @@ global;
layout(location = 0) in vec4 Position; layout(location = 0) in vec4 Position;
layout(location = 1) in vec2 TexCoord; layout(location = 1) in vec2 TexCoord;
layout(location = 0) out vec2 vTexCoord; layout(location = 0) out vec2 vTexCoord;
layout(location = 1) out vec2 tx_coord;
layout(location = 2) out vec2 tx_per_px;
layout(location = 3) out vec2 tx_to_uv;
void main() { void main() {
gl_Position = global.MVP * Position; gl_Position = global.MVP * Position;
vTexCoord = TexCoord; vTexCoord = TexCoord;
const vec2 scale_o2i = scale_o2i();
tx_coord = (vTexCoord - 0.49999) * scale_o2i + get_input_center();
tx_per_px = scale_o2i * param.FinalViewportSize.zw;
tx_to_uv = param.InputSize.zw;
} }
#pragma stage fragment #pragma stage fragment
layout(location = 0) in vec2 vTexCoord; layout(location = 0) in vec2 vTexCoord;
layout(location = 1) in vec2 tx_coord;
layout(location = 2) in vec2 tx_per_px;
layout(location = 3) in vec2 tx_to_uv;
layout(location = 0) out vec4 FragColor; layout(location = 0) out vec4 FragColor;
layout(set = 0, binding = 2) uniform sampler2D Input; layout(set = 0, binding = 2) uniform sampler2D Input;
layout(set = 0, binding = 3) uniform sampler2D Top; layout(set = 0, binding = 3) uniform sampler2D Top;
@ -122,20 +136,14 @@ vec3 blend_corner(vec3 a, // The first color to blend
} }
} }
#include "../../../interpolation/shaders/pixel_aa/shared.slang"
void main() { void main() {
const vec2 scale_o2i = scale_o2i(); if (tx_coord.x < param.OS_CROP_LEFT) {
const vec2 pixel_coord =
(vTexCoord - 0.49999) * scale_o2i + get_input_center();
if (pixel_coord.x < param.OS_CROP_LEFT) {
if (param.EXTEND_H < 0.5) { if (param.EXTEND_H < 0.5) {
FragColor = vec4(0.0, 0.0, 0.0, 1.0); FragColor = vec4(0.0, 0.0, 0.0, 1.0);
return; return;
} }
const vec3 left = textureLod(Left, vec2(0.5), BIG_NUMBER).rgb; const vec3 left = textureLod(Left, vec2(0.5), BIG_NUMBER).rgb;
if (pixel_coord.y < param.OS_CROP_TOP) { if (tx_coord.y < param.OS_CROP_TOP) {
if (param.EXTEND_V < 0.5) { if (param.EXTEND_V < 0.5) {
FragColor = vec4(0.0, 0.0, 0.0, 1.0); FragColor = vec4(0.0, 0.0, 0.0, 1.0);
return; return;
@ -155,7 +163,7 @@ void main() {
viewport_corner - content_corner), viewport_corner - content_corner),
1.0); 1.0);
FragColor.rgb = pow(FragColor.rgb, vec3(param.FILL_GAMMA)); FragColor.rgb = pow(FragColor.rgb, vec3(param.FILL_GAMMA));
} else if (pixel_coord.y < param.InputSize.y - param.OS_CROP_BOTTOM) { } else if (tx_coord.y < param.InputSize.y - param.OS_CROP_BOTTOM) {
// Left bar // Left bar
FragColor = vec4(pow(left, vec3(param.FILL_GAMMA)), 1.0); FragColor = vec4(pow(left, vec3(param.FILL_GAMMA)), 1.0);
} else { } else {
@ -179,8 +187,8 @@ void main() {
1.0); 1.0);
FragColor.rgb = pow(FragColor.rgb, vec3(param.FILL_GAMMA)); FragColor.rgb = pow(FragColor.rgb, vec3(param.FILL_GAMMA));
} }
} else if (pixel_coord.x < param.InputSize.x - param.OS_CROP_RIGHT) { } else if (tx_coord.x < param.InputSize.x - param.OS_CROP_RIGHT) {
if (pixel_coord.y < param.OS_CROP_TOP) { if (tx_coord.y < param.OS_CROP_TOP) {
if (param.EXTEND_V < 0.5) { if (param.EXTEND_V < 0.5) {
FragColor = vec4(0.0, 0.0, 0.0, 1.0); FragColor = vec4(0.0, 0.0, 0.0, 1.0);
return; return;
@ -188,41 +196,22 @@ void main() {
// Top bar // Top bar
FragColor = vec4(textureLod(Top, vec2(0.5), BIG_NUMBER).rgb, 1.0); FragColor = vec4(textureLod(Top, vec2(0.5), BIG_NUMBER).rgb, 1.0);
FragColor.rgb = pow(FragColor.rgb, vec3(param.FILL_GAMMA)); FragColor.rgb = pow(FragColor.rgb, vec3(param.FILL_GAMMA));
} else if (pixel_coord.y < param.InputSize.y - param.OS_CROP_BOTTOM) { } else if (tx_coord.y < param.InputSize.y - param.OS_CROP_BOTTOM) {
// Uncropped // Uncropped
if (param.FORCE_INTEGER_SCALING > 0.5) { if (param.FORCE_INTEGER_SCALING > 0.5) {
// Do a perfectly sharp (nearest neighbor) sampling. // Do a perfectly sharp (nearest neighbor) sampling.
FragColor = vec4(texture(Input, (floor(pixel_coord) + 0.5) * FragColor = vec4(
param.InputSize.zw) texture(Input, (floor(tx_coord) + 0.5) * param.InputSize.zw)
.rgb, .rgb,
1.0); 1.0);
} else { } else {
// Do a sharp anti-aliased interpolation. // Do a sharp anti-aliased interpolation.
// Do not correct for gamma additionally because the input is // Do not correct for gamma additionally because the input is
// already in linear color space. // already in linear color space.
if (param.PIX_AA_SUBPX < 0.5) { FragColor = pixel_aa(
const vec2 tx_size = get_texel_size(pixel_coord) * Input, tx_per_px, tx_to_uv, tx_coord, param.PIX_AA_SHARP,
scale_o2i * param.InputSize.zw; /* gamma_correct = */ false, param.PIX_AA_SUBPX > 0.5,
FragColor = param.PIX_AA_SUBPX_BGR > 0.5);
vec4(sample_aa(Input, pixel_coord, param.InputSize.zw,
false, param.PIX_AA_SHARP, tx_size),
1.0);
} else {
for (int i = -1; i < 2; ++i) {
const vec2 subpix_coord =
pixel_coord +
vec2((param.PIX_AA_SUBPX_BGR < 0.5 ? i : -i) / 3.0,
0.0) *
param.FinalViewportSize.zw * param.InputSize.xy;
const vec2 tx_size = get_texel_size(subpix_coord) *
scale_o2i * param.InputSize.zw /
vec2(3.0, 1.0);
FragColor[i + 1] = sample_aa(
Input, subpix_coord, param.InputSize.zw, false,
param.PIX_AA_SHARP, tx_size)[i + 1];
}
FragColor[3] = 1.0;
}
} }
} else { } else {
if (param.EXTEND_V < 0.5) { if (param.EXTEND_V < 0.5) {
@ -240,7 +229,7 @@ void main() {
return; return;
} }
const vec3 right = textureLod(Right, vec2(0.5), BIG_NUMBER).rgb; const vec3 right = textureLod(Right, vec2(0.5), BIG_NUMBER).rgb;
if (pixel_coord.y < param.OS_CROP_TOP) { if (tx_coord.y < param.OS_CROP_TOP) {
if (param.EXTEND_V < 0.5) { if (param.EXTEND_V < 0.5) {
FragColor = vec4(0.0, 0.0, 0.0, 1.0); FragColor = vec4(0.0, 0.0, 0.0, 1.0);
return; return;
@ -260,7 +249,7 @@ void main() {
viewport_corner - content_corner), viewport_corner - content_corner),
1.0); 1.0);
FragColor.rgb = pow(FragColor.rgb, vec3(param.FILL_GAMMA)); FragColor.rgb = pow(FragColor.rgb, vec3(param.FILL_GAMMA));
} else if (pixel_coord.y < param.InputSize.y - param.OS_CROP_BOTTOM) { } else if (tx_coord.y < param.InputSize.y - param.OS_CROP_BOTTOM) {
// Right bar // Right bar
FragColor = vec4(pow(right, vec3(param.FILL_GAMMA)), 1.0); FragColor = vec4(pow(right, vec3(param.FILL_GAMMA)), 1.0);
} else { } else {

2
border/shaders/average_fill/parameters.slang
View file

@ -1,7 +1,7 @@
// See compose.slang for copyright and other information. // See compose.slang for copyright and other information.
// clang-format off // clang-format off
#pragma parameter AVERAGE_FILL_SETTINGS "=== Average fill v1.4 settings ===" 0.0 0.0 1.0 1.0 #pragma parameter AVERAGE_FILL_SETTINGS "=== Average fill v1.5 settings ===" 0.0 0.0 1.0 1.0
#pragma parameter OS_CROP_TOP "Overscan crop top" 0.0 0.0 1024.0 1.0 #pragma parameter OS_CROP_TOP "Overscan crop top" 0.0 0.0 1024.0 1.0
#pragma parameter OS_CROP_BOTTOM "Overscan crop bottom" 0.0 0.0 1024.0 1.0 #pragma parameter OS_CROP_BOTTOM "Overscan crop bottom" 0.0 0.0 1024.0 1.0
#pragma parameter OS_CROP_LEFT "Overscan crop left" 0.0 0.0 1024.0 1.0 #pragma parameter OS_CROP_LEFT "Overscan crop left" 0.0 0.0 1024.0 1.0

65
border/shaders/blur_fill/compose.slang
View file

@ -1,7 +1,7 @@
#version 450 #version 450
/* /*
Blur fill v1.5 by fishku Blur fill v1.6 by fishku
Copyright (C) 2023 Copyright (C) 2023
Public domain license (CC0) Public domain license (CC0)
@ -27,6 +27,7 @@
strength of the blur. strength of the blur.
Changelog: Changelog:
v1.6: Optimize. Update to new Pixel AA version. Tune default blur strength.
v1.5: Add anti-aliased interpolation for non-integer scaling. v1.5: Add anti-aliased interpolation for non-integer scaling.
v1.4: Fix scaling bugs. v1.4: Fix scaling bugs.
v1.3: Reduce shimmering artifacts. v1.3: Reduce shimmering artifacts.
@ -35,8 +36,11 @@
v1.0: Initial release. v1.0: Initial release.
*/ */
#include "../../../blurs/shaders/dual_filter/parameters.slang" // clang-format off
#include "parameters.slang" #include "parameters.slang"
#include "../../../blurs/shaders/dual_filter/parameters.slang"
#include "../../../interpolation/shaders/pixel_aa/shared.slang"
// clang-format on
layout(push_constant) uniform Push { layout(push_constant) uniform Push {
vec4 InputSize; vec4 InputSize;
@ -71,31 +75,37 @@ global;
layout(location = 0) in vec4 Position; layout(location = 0) in vec4 Position;
layout(location = 1) in vec2 TexCoord; layout(location = 1) in vec2 TexCoord;
layout(location = 0) out vec2 vTexCoord; layout(location = 0) out vec2 vTexCoord;
layout(location = 1) out vec2 tx_coord;
layout(location = 2) out vec2 tx_per_px;
layout(location = 3) out vec2 tx_to_uv;
layout(location = 4) out vec4 input_extrema;
void main() { void main() {
gl_Position = global.MVP * Position; gl_Position = global.MVP * Position;
vTexCoord = TexCoord; vTexCoord = TexCoord;
const vec2 scale_o2i = scale_o2i();
tx_coord = (vTexCoord - 0.49999) * scale_o2i + get_input_center();
tx_per_px = scale_o2i * param.FinalViewportSize.zw;
tx_to_uv = param.InputSize.zw;
input_extrema = vec4(param.OS_CROP_LEFT, param.OS_CROP_TOP,
param.InputSize.x - param.OS_CROP_RIGHT,
param.InputSize.y - param.OS_CROP_BOTTOM);
} }
#pragma stage fragment #pragma stage fragment
layout(location = 0) in vec2 vTexCoord; layout(location = 0) in vec2 vTexCoord;
layout(location = 1) in vec2 tx_coord;
layout(location = 2) in vec2 tx_per_px;
layout(location = 3) in vec2 tx_to_uv;
layout(location = 4) in vec4 input_extrema;
layout(location = 0) out vec4 FragColor; layout(location = 0) out vec4 FragColor;
layout(set = 0, binding = 2) uniform sampler2D Input; layout(set = 0, binding = 2) uniform sampler2D Input;
layout(set = 0, binding = 3) uniform sampler2D Tiled; layout(set = 0, binding = 3) uniform sampler2D Tiled;
layout(set = 0, binding = 4) uniform sampler2D Blurred; layout(set = 0, binding = 4) uniform sampler2D Blurred;
#include "../../../interpolation/shaders/pixel_aa/shared.slang"
void main() { void main() {
const vec2 scale_o2i = scale_o2i(); if (any(lessThan(tx_coord, input_extrema.xy)) ||
const vec2 pixel_coord = any(greaterThanEqual(tx_coord, input_extrema.zw))) {
(vTexCoord - 0.49999) * scale_o2i + get_input_center();
const vec4 input_extrema = vec4(param.OS_CROP_LEFT, param.OS_CROP_TOP,
param.InputSize.x - param.OS_CROP_RIGHT,
param.InputSize.y - param.OS_CROP_BOTTOM);
if (any(lessThan(pixel_coord, input_extrema.xy)) ||
any(greaterThanEqual(pixel_coord, input_extrema.zw))) {
if (param.BLUR_RADIUS > 0.0) { if (param.BLUR_RADIUS > 0.0) {
// Sample blur. // Sample blur.
FragColor = vec4( FragColor = vec4(
@ -117,36 +127,17 @@ void main() {
if (param.FORCE_INTEGER_SCALING > 0.5) { if (param.FORCE_INTEGER_SCALING > 0.5) {
// Do a perfectly sharp (nearest neighbor) sampling. // Do a perfectly sharp (nearest neighbor) sampling.
FragColor = vec4( FragColor = vec4(
texture(Input, (floor(pixel_coord) + 0.5) * param.InputSize.zw) texture(Input, (floor(tx_coord) + 0.5) * param.InputSize.zw)
.rgb, .rgb,
1.0); 1.0);
} else { } else {
// Do a sharp anti-aliased interpolation. // Do a sharp anti-aliased interpolation.
// Do not correct for gamma additionally because the input is // Do not correct for gamma additionally because the input is
// already in linear color space. // already in linear color space.
if (param.PIX_AA_SUBPX < 0.5) { FragColor = pixel_aa(
const vec2 tx_size = get_texel_size(pixel_coord) * scale_o2i * Input, tx_per_px, tx_to_uv, tx_coord, param.PIX_AA_SHARP,
param.InputSize.zw; /* gamma_correct = */ false, param.PIX_AA_SUBPX > 0.5,
FragColor = param.PIX_AA_SUBPX_BGR > 0.5);
vec4(sample_aa(Input, pixel_coord, param.InputSize.zw,
false, param.PIX_AA_SHARP, tx_size),
1.0);
} else {
for (int i = -1; i < 2; ++i) {
const vec2 subpix_coord =
pixel_coord +
vec2((param.PIX_AA_SUBPX_BGR < 0.5 ? i : -i) / 3.0,
0.0) *
param.FinalViewportSize.zw * param.InputSize.xy;
const vec2 tx_size = get_texel_size(subpix_coord) *
scale_o2i * param.InputSize.zw /
vec2(3.0, 1.0);
FragColor[i + 1] =
sample_aa(Input, subpix_coord, param.InputSize.zw,
false, param.PIX_AA_SHARP, tx_size)[i + 1];
}
FragColor[3] = 1.0;
}
} }
} }
} }

2
border/shaders/blur_fill/parameters.slang
View file

@ -1,7 +1,7 @@
// See compose.slang for copyright and other information. // See compose.slang for copyright and other information.
// clang-format off // clang-format off
#pragma parameter BLUR_FILL_SETTINGS "=== Blur fill v1.5 settings ===" 0.0 0.0 1.0 1.0 #pragma parameter BLUR_FILL_SETTINGS "=== Blur fill v1.6 settings ===" 0.0 0.0 1.0 1.0
#pragma parameter OS_CROP_TOP "Overscan crop top" 0.0 0.0 1024.0 1.0 #pragma parameter OS_CROP_TOP "Overscan crop top" 0.0 0.0 1024.0 1.0
#pragma parameter OS_CROP_BOTTOM "Overscan crop bottom" 0.0 0.0 1024.0 1.0 #pragma parameter OS_CROP_BOTTOM "Overscan crop bottom" 0.0 0.0 1024.0 1.0
#pragma parameter OS_CROP_LEFT "Overscan crop left" 0.0 0.0 1024.0 1.0 #pragma parameter OS_CROP_LEFT "Overscan crop left" 0.0 0.0 1024.0 1.0

43
interpolation/shaders/pixel_aa/pixel_aa.slang
View file

@ -1,7 +1,7 @@
#version 450 #version 450
/* /*
Pixel AA v1.1 by fishku Pixel AA v1.2 by fishku
Copyright (C) 2023 Copyright (C) 2023
Public domain license (CC0) Public domain license (CC0)
@ -24,6 +24,8 @@
subpixel anti-aliasing, results are identical to the "pixellate" shader. subpixel anti-aliasing, results are identical to the "pixellate" shader.
Changelog: Changelog:
v1.2: Optimize and simplify algorithm. Enable sharpness < 1.0. Fix subpixel
sampling bug.
v1.1: Better subpixel sampling. v1.1: Better subpixel sampling.
v1.0: Initial release. v1.0: Initial release.
*/ */
@ -44,44 +46,29 @@ global;
#pragma stage vertex #pragma stage vertex
layout(location = 0) in vec4 Position; layout(location = 0) in vec4 Position;
layout(location = 1) in vec2 TexCoord; layout(location = 1) in vec2 TexCoord;
layout(location = 0) out vec2 vTexCoord; layout(location = 0) out vec2 tx_coord;
layout(location = 1) out vec2 pix_coord; layout(location = 1) out vec2 tx_per_px;
layout(location = 2) out vec2 tx_to_uv;
void main() { void main() {
gl_Position = global.MVP * Position; gl_Position = global.MVP * Position;
vTexCoord = TexCoord; tx_coord = TexCoord * param.SourceSize.xy;
pix_coord = vTexCoord * param.SourceSize.xy; tx_per_px = param.SourceSize.xy * param.OutputSize.zw;
tx_to_uv = param.SourceSize.zw;
} }
#pragma stage fragment #pragma stage fragment
layout(location = 0) in vec2 vTexCoord; layout(location = 0) in vec2 tx_coord;
layout(location = 1) in vec2 pix_coord; layout(location = 1) in vec2 tx_per_px;
layout(location = 2) in vec2 tx_to_uv;
layout(location = 0) out vec4 FragColor; layout(location = 0) out vec4 FragColor;
layout(set = 0, binding = 2) uniform sampler2D Source; layout(set = 0, binding = 2) uniform sampler2D Source;
#include "shared.slang" #include "shared.slang"
void main() { void main() {
if (param.PIX_AA_SUBPX < 0.5) {
FragColor = FragColor =
vec4(sample_aa(Source, pix_coord, param.SourceSize.zw, pixel_aa(Source, tx_per_px, tx_to_uv, tx_coord, param.PIX_AA_SHARP,
param.PIX_AA_GAMMA > 0.5, param.PIX_AA_SHARP), param.PIX_AA_GAMMA > 0.5, param.PIX_AA_SUBPX > 0.5,
1.0); param.PIX_AA_SUBPX_BGR > 0.5);
} else {
// Subpixel sampling: Shift the sampling by 1/3rd of an output pixel,
// assuming that the output size is at monitor resolution.
for (int i = -1; i < 2; ++i) {
const vec2 subpix_coord =
pix_coord +
vec2((param.PIX_AA_SUBPX_BGR < 0.5 ? i : -i) / 3.0, 0.0) *
param.OutputSize.zw * param.SourceSize.xy;
// With subpixel sampling, the sampling area is effectively reduced
// to a third.
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;
}
} }

90
interpolation/shaders/pixel_aa/shared.slang
View file

@ -1,9 +1,8 @@
// This file has to be included at the frag shader stage so that fwidth() is // See pixel_aa.slang for copyright and other information.
// defined.
// clang-format off // clang-format off
#pragma parameter PIX_AA_SETTINGS "=== Pixel AA v1.1 settings ===" 0.0 0.0 1.0 1.0 #pragma parameter PIX_AA_SETTINGS "=== Pixel AA v1.2 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" 1.5 0.0 2.0 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
#pragma parameter PIX_AA_SUBPX_BGR "Use BGR subpx. instead of RGB" 0.0 0.0 1.0 1.0 #pragma parameter PIX_AA_SUBPX_BGR "Use BGR subpx. instead of RGB" 0.0 0.0 1.0 1.0
@ -25,40 +24,65 @@ 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) { // Function to get a single sample using the "pixel AA" method.
return clamp(fwidth(pix_coord), 1.0e-5, 1.0);
}
// Params: // Params:
// pix_coord: Coordinate in source pixel coordinates // tx_coord: Coordinate in source pixel (texel) coordinates
// px_size_uv: 1 / source resolution vec3 sample_aa(sampler2D tex, vec2 tx_per_px, vec2 tx_to_uv, vec2 tx_coord,
vec3 sample_aa(sampler2D tex, vec2 pix_coord, vec2 px_size_uv, float sharpness, bool gamma_correct) {
bool gamma_correct, float sharpness, vec2 tx_size) { // The offset for interpolation is a periodic function with
const vec2 tx_coord = pix_coord - 0.5 * tx_size; // a period length of 1 texel.
const vec2 tx_coord_i = floor(tx_coord); // The input coordinate is shifted so that the center of the texel
const vec2 tx_offset = // aligns with the start of the period.
slopestep(1.0 - tx_size, vec2(1.0), fract(tx_coord), sharpness); // First, get the period and phase.
// With gamma correct blending, we have to do 4 taps and blend manually. vec2 period;
// Without it, we can make use of a single tap using bilinear interpolation. const vec2 phase = modf(tx_coord - 0.5, period);
// The function starts at 0, then starts transitioning at
// 0.5 - 0.5 / pixels_per_texel, then reaches 0.5 at 0.5,
// Then reaches 1 at 0.5 + 0.5 / pixels_per_texel.
// For sharpness values < 1.0, blend to bilinear filtering.
const vec2 offset =
slopestep(min(1.0, sharpness) * (0.5 - 0.5 * tx_per_px),
1.0 - min(1.0, sharpness) * (1.0 - (0.5 + 0.5 * tx_per_px)),
phase, max(1.0, sharpness));
// With gamma correct blending, we have to do 4 taps and interpolate
// manually. Without it, we can make use of a single tap using bilinear
// interpolation. The offsets are shifted back to the texel center before
// sampling.
if (gamma_correct) { if (gamma_correct) {
const vec3 samples[] = { const vec3 samples[] = {
to_lin(texture(tex, (tx_coord_i + 0.5) * px_size_uv).rgb), to_lin(texture(tex, (period + 0.5) * tx_to_uv).rgb),
to_lin( to_lin(texture(tex, (period + vec2(1.5, 0.5)) * tx_to_uv).rgb),
texture(tex, (tx_coord_i + vec2(1.5, 0.5)) * px_size_uv).rgb), to_lin(texture(tex, (period + vec2(0.5, 1.5)) * tx_to_uv).rgb),
to_lin( to_lin(texture(tex, (period + 1.5) * tx_to_uv).rgb)};
texture(tex, (tx_coord_i + vec2(0.5, 1.5)) * px_size_uv).rgb), return to_srgb(mix(mix(samples[0], samples[1], offset.x),
to_lin(texture(tex, (tx_coord_i + 1.5) * px_size_uv).rgb)}; mix(samples[2], samples[3], offset.x), offset.y));
return to_srgb(mix(mix(samples[0], samples[1], tx_offset.x),
mix(samples[2], samples[3], tx_offset.x),
tx_offset.y));
} else { } else {
return texture(tex, (tx_coord_i + 0.5 + tx_offset) * px_size_uv).rgb; return texture(tex, (period + 0.5 + offset) * tx_to_uv).rgb;
} }
} }
vec3 sample_aa(sampler2D tex, vec2 pix_coord, vec2 px_size_uv, // Function to get a pixel value, taking into consideration possible subpixel
bool gamma_correct, float sharpness) { // interpolation.
const vec2 tx_size = get_texel_size(pix_coord); vec4 pixel_aa(sampler2D tex, vec2 tx_per_px, vec2 tx_to_uv, vec2 tx_coord,
return sample_aa(tex, pix_coord, px_size_uv, gamma_correct, sharpness, float sharpness, bool gamma_correct, bool sample_subpx,
tx_size); bool subpx_bgr) {
if (sample_subpx) {
// Subpixel sampling: Shift the sampling by 1/3rd of an output pixel for
// each subpixel, assuming that the output size is at monitor
// resolution.
const vec2 sub_tx_offset =
vec2(tx_per_px.x / 3.0 * (subpx_bgr ? -1.0 : 1.0), 0.0);
vec3 res;
for (int i = -1; i < 2; ++i) {
res[i + 1] = sample_aa(tex, tx_per_px, tx_to_uv,
tx_coord + sub_tx_offset * float(i),
sharpness, gamma_correct)[i + 1];
}
return vec4(res, 1.0);
} else {
return vec4(sample_aa(tex, tx_per_px, tx_to_uv, tx_coord, sharpness,
gamma_correct),
1.0);
}
} }