Add some shaders to dolphinfx folder

This is a first pack of shaders ported to dolphinfx specs.

It includes: crt-hyllian, crt-easymode, zfast-crt, ddt, xbr, jinc2 and pixellate.

data/resources/shaders/dolphinfx/pixel-art/PIXELLATE.glsl

@@ -0,0 +1,76 @@
+//    Pixellate Shader
+//    Copyright (c) 2011, 2012 Fes
+//    Permission to use, copy, modify, and/or distribute this software for any
+//    purpose with or without fee is hereby granted, provided that the above
+//    copyright notice and this permission notice appear in all copies.
+//    THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+//    WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+//    MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+//    SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+//   WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+//    ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
+//    IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+//    (Fes gave their permission to have this shader distributed under this
+//    licence in this forum post:
+//        http://board.byuu.org/viewtopic.php?p=57295#p57295
+
+
+/*
+[configuration]
+
+[OptionRangeFloat]
+GUIName = Linear Gamma Weight
+OptionName = INTERPOLATE_IN_LINEAR_GAMMA
+MinValue = 0.0
+MaxValue = 1.0
+StepAmount = 1.0
+DefaultValue = 1.0
+
+[/configuration]
+*/
+
+void main()
+{
+   vec2 vTexCoord  = GetCoordinates();
+   vec2 SourceSize = 1.0 / GetInvNativePixelSize();
+   vec2 texelSize  = 1.0 / SourceSize.xy;
+   vec2 OutputSize = GetResolution().xy;
+
+   vec2 range = vec2(abs(SourceSize.x / (OutputSize.x * SourceSize.x)), abs(SourceSize.y / (OutputSize.y * SourceSize.y)));
+   range = range / 2.0 * 0.999;
+
+   float left   = vTexCoord.x - range.x;
+   float top    = vTexCoord.y + range.y;
+   float right  = vTexCoord.x + range.x;
+   float bottom = vTexCoord.y - range.y;
+   
+   vec3 topLeftColor;
+   vec3 bottomRightColor;
+   vec3 bottomLeftColor;
+   vec3 topRightColor;
+
+   if (GetOption(INTERPOLATE_IN_LINEAR_GAMMA) > 0.5){
+   topLeftColor     = pow(SampleLocation((floor(vec2(left, top)     / texelSize) + vec2(0.5)) * texelSize).rgb, vec3(2.2));
+   bottomRightColor = pow(SampleLocation((floor(vec2(right, bottom) / texelSize) + vec2(0.5)) * texelSize).rgb, vec3(2.2));
+   bottomLeftColor  = pow(SampleLocation((floor(vec2(left, bottom)  / texelSize) + vec2(0.5)) * texelSize).rgb, vec3(2.2));
+   topRightColor    = pow(SampleLocation((floor(vec2(right, top)    / texelSize) + vec2(0.5)) * texelSize).rgb, vec3(2.2));
+   }else{
+   topLeftColor     = SampleLocation((floor(vec2(left, top)     / texelSize) + vec2(0.5)) * texelSize).rgb;
+   bottomRightColor = SampleLocation((floor(vec2(right, bottom) / texelSize) + vec2(0.5)) * texelSize).rgb;
+   bottomLeftColor  = SampleLocation((floor(vec2(left, bottom)  / texelSize) + vec2(0.5)) * texelSize).rgb;
+   topRightColor    = SampleLocation((floor(vec2(right, top)    / texelSize) + vec2(0.5)) * texelSize).rgb;}
+
+   vec2 border = clamp(round(vTexCoord / texelSize) * texelSize, vec2(left, bottom), vec2(right, top));
+
+   float totalArea = 4.0 * range.x * range.y;
+
+   vec3 averageColor;
+   averageColor  = ((border.x - left)  * (top - border.y)    / totalArea) * topLeftColor;
+   averageColor += ((right - border.x) * (border.y - bottom) / totalArea) * bottomRightColor;
+   averageColor += ((border.x - left)  * (border.y - bottom) / totalArea) * bottomLeftColor;
+   averageColor += ((right - border.x) * (top - border.y)    / totalArea) * topRightColor;
+
+   vec4 color = (GetOption(INTERPOLATE_IN_LINEAR_GAMMA) > 0.5) ? vec4(pow(averageColor, vec3(1.0 / 2.2)), 1.0) : vec4(averageColor, 1.0);
+
+   SetOutput(color);
+}