blind conversion of hqx pass2

hqx/pass2.inc

@@ -0,0 +1,78 @@
+#version 450
+
+layout(push_constant) uniform Push
+{
+	vec4 SourceSize;
+	vec4 OriginalSize;
+	vec4 OutputSize;
+} registers;
+
+layout(std140, set = 0, binding = 0) uniform UBO
+{
+   mat4 MVP;
+} global;
+
+/*
+* Copyright (C) 2003 Maxim Stepin ( maxst@hiend3d.com )
+*
+* Copyright (C) 2010 Cameron Zemek ( grom@zeminvaders.net )
+*
+* Copyright (C) 2014 Jules Blok ( jules@aerix.nl )
+*
+* This program is free software; you can redistribute it and/or
+* modify it under the terms of the GNU Lesser General Public
+* License as published by the Free Software Foundation; either
+* version 2.1 of the License, 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
+* Lesser General Public License for more details.
+*
+* You should have received a copy of the GNU Lesser General Public
+* License along with this program; if not, write to the Free Software
+* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+*/
+
+#pragma stage vertex
+layout(location = 0) in vec4 Position;
+layout(location = 1) in vec2 TexCoord;
+layout(location = 0) out vec2 vTexCoord;
+
+void main()
+{
+	gl_Position	=	global.MVP * Position;
+	vTexCoord	=	TexCoord;
+}
+
+#pragma stage fragment
+layout(location = 0) in vec2 vTexCoord;
+layout(location = 0) out vec4 FragColor;
+layout(set = 0, binding = 2) uniform sampler2D Source;
+layout(set = 0, binding = 3) uniform sampler2D LUT;
+
+void main()
+{
+	vec2 fp = fract(vTexCoord * registers.SourceSize.xy);
+	vec2 quad = sign(-0.5 + fp);
+
+	float dx = registers.SourceSize.z;
+	float dy = registers.SourceSize.w;
+
+	vec3 p1 = texture(Original, vTexCoord).rgb;
+	vec3 p2 = texture(Original, vTexCoord + vec2(dx, dy) * quad).rgb;
+	vec3 p3 = texture(Original, vTexCoord + vec2(dx, 0.0) * quad).rgb;
+	vec3 p4 = texture(Original, vTexCoord + vec2(0.0, dy) * quad).rgb;
+	vec4x3 pixels = vec4x3(p1, p2, p3, p4);
+
+	vec2 index = texture(Source, vTexCoord).xy * vec2(255.0, 15.0 * (SCALE * SCALE));
+	index.y += dot(floor(fp * SCALE), vec2(1.0, SCALE));
+
+	vec2 step = 1.0 / vec2(256.0, 16.0 * (SCALE * SCALE));
+	vec2 offset = step / 2.0;
+	vec4 weights = texture(LUT, index * step + offset);
+	float sum = dot(weights, vec4(1.0));
+	vec3 res = transpose(pixels) * (weights / sum);
+
+	FragColor = vec4(res, 1.0);
+}