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#version 120
// 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
#define INTERPOLATE_IN_LINEAR_GAMMA 1.0
uniform vec2 rubyTextureSize;
uniform vec2 rubyInputSize;
#if defined(VERTEX)
#if __VERSION__ >= 130
#define COMPAT_VARYING out
#define COMPAT_ATTRIBUTE in
#define COMPAT_TEXTURE texture
#else
#define COMPAT_VARYING varying
#define COMPAT_ATTRIBUTE attribute
#define COMPAT_TEXTURE texture2D
#endif
#ifdef GL_ES
#define COMPAT_PRECISION mediump
#else
#define COMPAT_PRECISION
#endif
COMPAT_ATTRIBUTE vec4 a_position;
COMPAT_VARYING vec2 v_texCoord;
void main()
{
gl_Position = a_position;
v_texCoord = vec2(a_position.x + 1.0, 1.0 - a_position.y) / 2.0 * rubyInputSize / rubyTextureSize;
}
#elif defined(FRAGMENT)
#if __VERSION__ >= 130
#define COMPAT_VARYING in
#define COMPAT_TEXTURE texture
out vec4 FragColor;
#else
#define COMPAT_VARYING varying
#define FragColor gl_FragColor
#define COMPAT_TEXTURE texture2D
#endif
#ifdef GL_ES
#ifdef GL_FRAGMENT_PRECISION_HIGH
precision highp float;
#else
precision mediump float;
#endif
#define COMPAT_PRECISION highp
#else
#define COMPAT_PRECISION
#endif
COMPAT_VARYING vec2 v_texCoord;
uniform vec2 rubyOutputSize;
uniform sampler2D rubyTexture;
#define OutputSize rubyOutputSize
#define TextureSize rubyTextureSize
#define InputSize rubyInputSize
#define Texture rubyTexture
#define TEX0 v_texCoord
// fragment compatibility #defines
#define Source Texture
#define vTexCoord TEX0.xy
#define SourceSize vec4(TextureSize, 1.0 / TextureSize) //either TextureSize or InputSize
#define outsize vec4(OutputSize, 1.0 / OutputSize)
void main()
{
vec2 texelSize = SourceSize.zw;
vec2 range = vec2(abs(InputSize.x / (outsize.x * SourceSize.x)), abs(InputSize.y / (outsize.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 = COMPAT_TEXTURE(Source, (floor(vec2(left, top) / texelSize) + 0.5) * texelSize).rgb;
vec3 bottomRightColor = COMPAT_TEXTURE(Source, (floor(vec2(right, bottom) / texelSize) + 0.5) * texelSize).rgb;
vec3 bottomLeftColor = COMPAT_TEXTURE(Source, (floor(vec2(left, bottom) / texelSize) + 0.5) * texelSize).rgb;
vec3 topRightColor = COMPAT_TEXTURE(Source, (floor(vec2(right, top) / texelSize) + 0.5) * texelSize).rgb;
if (INTERPOLATE_IN_LINEAR_GAMMA > 0.5){
topLeftColor = pow(topLeftColor, vec3(2.2));
bottomRightColor = pow(bottomRightColor, vec3(2.2));
bottomLeftColor = pow(bottomLeftColor, vec3(2.2));
topRightColor = pow(topRightColor, vec3(2.2));
}
vec2 border = clamp(floor((vTexCoord / texelSize) + vec2(0.5)) * 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;
FragColor = (INTERPOLATE_IN_LINEAR_GAMMA > 0.5) ? vec4(pow(averageColor, vec3(1.0 / 2.2)), 1.0) : vec4(averageColor, 1.0);
}
#endif
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