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// Copyright (C) 2023 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#version 440
layout(location = 0) in vec2 sampleCoord;
layout(location = 1) in vec3 sampleFarLeft;
layout(location = 2) in vec3 sampleNearLeft;
layout(location = 3) in vec3 sampleNearRight;
layout(location = 4) in vec3 sampleFarRight;
layout(location = 0) out vec4 fragColor;
layout(binding = 1) uniform sampler2D _qt_texture;
layout(std140, binding = 0) uniform buf {
#if QSHADER_VIEW_COUNT >= 2
mat4 matrix[QSHADER_VIEW_COUNT];
#else
mat4 matrix;
#endif
vec2 textureScale;
vec4 color;
float alphaMin;
float alphaMax;
// up to this point it must match distancefieldtext
float fontScale;
vec4 vecDelta;
};
void main()
{
vec4 n;
n.x = textureProj(_qt_texture, sampleFarLeft).r;
n.y = textureProj(_qt_texture, sampleNearLeft).r;
float c = texture(_qt_texture, sampleCoord).r;
n.z = textureProj(_qt_texture, sampleNearRight).r;
n.w = textureProj(_qt_texture, sampleFarRight).r;
vec2 d = min(abs(n.yw - n.xz) * 2., 0.67);
vec2 lo = mix(vec2(alphaMin), vec2(0.5), d);
vec2 hi = mix(vec2(alphaMax), vec2(0.5), d);
n = smoothstep(lo.xxyy, hi.xxyy, n);
c = smoothstep(lo.x + lo.y, hi.x + hi.y, 2. * c);
fragColor = vec4(0.333 * (n.xyz + n.yzw + c), c) * color.w;
}
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