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Isaac 2023-01-21 12:23:33 +01:00
parent 99d5c24fd3
commit aa215b821e
1 changed files with 18 additions and 19 deletions
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37
crt/shaders/crt-1tap.slang
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@ -1,9 +1,9 @@
#version 450 #version 450
/* /*
crt-1tap v1.0 by fishku crt-1tap v1.1 by fishku
Copyright (C) 2023 Copyright (C) 2023
Public domain license Public domain license (CC0)
Extremely fast and lightweight dynamic scanline shader. Extremely fast and lightweight dynamic scanline shader.
Contrasty and sharp output. Easy to configure. Contrasty and sharp output. Easy to configure.
@ -21,15 +21,17 @@
for even and odd integer scaling. for even and odd integer scaling.
Changelog: Changelog:
v1.1: Update license; Better defaults; Don't compute alpha.
v1.0: Initial release. v1.0: Initial release.
*/ */
// clang-format off // clang-format off
#pragma parameter CRT1TAP_SETTINGS "=== CRT-1tap settings ===" 0.0 0.0 1.0 1.0
#pragma parameter MIN_THICK "MIN_THICK: Scanline thickness of dark pixels." 0.3 0.0 1.4 0.05 #pragma parameter MIN_THICK "MIN_THICK: Scanline thickness of dark pixels." 0.3 0.0 1.4 0.05
#pragma parameter MAX_THICK "MAX_THICK: Scanline thickness of bright pixels." 1.05 0.0 1.4 0.05 #pragma parameter MAX_THICK "MAX_THICK: Scanline thickness of bright pixels." 1.05 0.0 1.4 0.05
#pragma parameter V_SHARP "V_SHARP: Vertical sharpness of the scanline" 0.2 0.0 1.0 0.05 #pragma parameter V_SHARP "V_SHARP: Vertical sharpness of the scanline" 0.2 0.0 1.0 0.05
#pragma parameter H_SHARP "H_SHARP: Horizontal sharpness of pixel transitions." 0.15 0.0 1.0 0.05 #pragma parameter H_SHARP "H_SHARP: Horizontal sharpness of pixel transitions." 0.15 0.0 1.0 0.05
#pragma parameter SUBPX_POS "SUBPX_POS: Scanline subpixel position." 0.05 -0.5 0.5 0.01 #pragma parameter SUBPX_POS "SUBPX_POS: Scanline subpixel position." 0.15 -0.5 0.5 0.01
#pragma parameter THICK_FALLOFF "THICK_FALLOFF: Reduction of thinner scanlines." 0.65 0.2 2.0 0.05 #pragma parameter THICK_FALLOFF "THICK_FALLOFF: Reduction of thinner scanlines." 0.65 0.2 2.0 0.05
// clang-format on // clang-format on
@ -79,24 +81,21 @@ void main() {
const float src_x = const float src_x =
src_x_int + o - src_x_int + o -
0.5f * s * 0.5f * s *
pow(2.0f * (o - s * src_x_fract), mix(1.5f, 10.0f, param.H_SHARP)); pow(2.0f * (o - s * src_x_fract), mix(1.0f, 6.0f, param.H_SHARP));
const vec4 signal = const vec3 signal =
texture(Source, vec2((src_x + 0.5f) * param.SourceSize.z, texture(Source, vec2((src_x + 0.5f) * param.SourceSize.z,
(src_y_int + 0.5f) * param.SourceSize.w)); (src_y_int + 0.5f) * param.SourceSize.w))
.rgb;
// Vectorize operations for speed. // Vectorize operations for speed.
const float eff_v_sharp = 5.0f + 100.0f * param.V_SHARP * param.V_SHARP; const float eff_v_sharp = 3.0f + 50.0f * param.V_SHARP * param.V_SHARP;
const vec4 min_thick = {param.MIN_THICK, param.MIN_THICK, param.MIN_THICK, FragColor.rgb =
param.MIN_THICK}; signal *
const vec4 max_thick = {param.MAX_THICK, param.MAX_THICK, param.MAX_THICK, clamp(eff_v_sharp *
param.MAX_THICK}; ((pow(mix(param.MIN_THICK.xxx, param.MAX_THICK.xxx, signal),
const vec4 thick_falloff = {param.THICK_FALLOFF, param.THICK_FALLOFF, param.THICK_FALLOFF.xxx) *
param.THICK_FALLOFF, param.THICK_FALLOFF}; 0.5f) -
FragColor = abs(src_y_fract - 0.5f)),
signal * clamp(eff_v_sharp * ((pow(mix(min_thick, max_thick, signal), 0.0f, 1.0f);
thick_falloff) *
0.5f) -
abs(src_y_fract - 0.5f)),
0.0f, 1.0f);
} }