From c04dcc2e7d834218ef2d4194331e383402495ae1 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Wed, 10 Apr 2024 20:07:22 +0200 Subject: Adding upstream version 2:20.4+dfsg. Signed-off-by: Daniel Baumann --- system/shaders/GL/1.2/gl_convolution-6x6.glsl | 100 ++++++++++++++++++++++++++ 1 file changed, 100 insertions(+) create mode 100644 system/shaders/GL/1.2/gl_convolution-6x6.glsl (limited to 'system/shaders/GL/1.2/gl_convolution-6x6.glsl') diff --git a/system/shaders/GL/1.2/gl_convolution-6x6.glsl b/system/shaders/GL/1.2/gl_convolution-6x6.glsl new file mode 100644 index 0000000..26c9f49 --- /dev/null +++ b/system/shaders/GL/1.2/gl_convolution-6x6.glsl @@ -0,0 +1,100 @@ +/* + * Copyright (C) 2010-2013 Team XBMC + * http://xbmc.org + * + * This Program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2, or (at your option) + * any later version. + * + * This Program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with XBMC; see the file COPYING. If not, see + * . + * + */ + +uniform sampler2D img; +uniform vec2 stepxy; +uniform float m_stretch; +uniform float m_alpha; +varying vec2 m_cord; +uniform sampler1D kernelTex; + +vec3 weight(float pos) +{ +#if defined(HAS_FLOAT_TEXTURE) + return texture1D(kernelTex, pos).rgb; +#else + return texture1D(kernelTex, pos).rgb * 2.0 - 1.0; +#endif +} + +vec2 stretch(vec2 pos) +{ +#if (XBMC_STRETCH) + // our transform should map [0..1] to itself, with f(0) = 0, f(1) = 1, f(0.5) = 0.5, and f'(0.5) = b. + // a simple curve to do this is g(x) = b(x-0.5) + (1-b)2^(n-1)(x-0.5)^n + 0.5 + // where the power preserves sign. n = 2 is the simplest non-linear case (required when b != 1) + float x = pos.x - 0.5; + return vec2(mix(x * abs(x) * 2.0, x, m_stretch) + 0.5, pos.y); +#else + return pos; +#endif +} + +vec3 pixel(float xpos, float ypos) +{ + return texture2D(img, vec2(xpos, ypos)).rgb; +} + +vec3 line (float ypos, vec3 xpos1, vec3 xpos2, vec3 linetaps1, vec3 linetaps2) +{ + return + pixel(xpos1.r, ypos) * linetaps1.r + + pixel(xpos1.g, ypos) * linetaps2.r + + pixel(xpos1.b, ypos) * linetaps1.g + + pixel(xpos2.r, ypos) * linetaps2.g + + pixel(xpos2.g, ypos) * linetaps1.b + + pixel(xpos2.b, ypos) * linetaps2.b; +} + +vec4 process() +{ + vec4 rgb; + vec2 pos = stretch(m_cord) + stepxy * 0.5; + vec2 f = fract(pos / stepxy); + + vec3 linetaps1 = weight((1.0 - f.x) / 2.0); + vec3 linetaps2 = weight((1.0 - f.x) / 2.0 + 0.5); + vec3 columntaps1 = weight((1.0 - f.y) / 2.0); + vec3 columntaps2 = weight((1.0 - f.y) / 2.0 + 0.5); + + //make sure all taps added together is exactly 1.0, otherwise some (very small) distortion can occur + float sum = linetaps1.r + linetaps1.g + linetaps1.b + linetaps2.r + linetaps2.g + linetaps2.b; + linetaps1 /= sum; + linetaps2 /= sum; + sum = columntaps1.r + columntaps1.g + columntaps1.b + columntaps2.r + columntaps2.g + columntaps2.b; + columntaps1 /= sum; + columntaps2 /= sum; + + vec2 xystart = (-2.5 - f) * stepxy + pos; + vec3 xpos1 = vec3(xystart.x, xystart.x + stepxy.x, xystart.x + stepxy.x * 2.0); + vec3 xpos2 = vec3(xystart.x + stepxy.x * 3.0, xystart.x + stepxy.x * 4.0, xystart.x + stepxy.x * 5.0); + + rgb.rgb = + line(xystart.y , xpos1, xpos2, linetaps1, linetaps2) * columntaps1.r + + line(xystart.y + stepxy.y , xpos1, xpos2, linetaps1, linetaps2) * columntaps2.r + + line(xystart.y + stepxy.y * 2.0, xpos1, xpos2, linetaps1, linetaps2) * columntaps1.g + + line(xystart.y + stepxy.y * 3.0, xpos1, xpos2, linetaps1, linetaps2) * columntaps2.g + + line(xystart.y + stepxy.y * 4.0, xpos1, xpos2, linetaps1, linetaps2) * columntaps1.b + + line(xystart.y + stepxy.y * 5.0, xpos1, xpos2, linetaps1, linetaps2) * columntaps2.b; + + rgb.a = m_alpha; + + return rgb; +} -- cgit v1.2.3