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// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
// SPDX-License-Identifier: GPL-3.0-or-later
#version 460 core
layout (location = 0) in vec2 frag_tex_coord;
layout (location = 0) out vec4 color;
layout (binding = 0) uniform sampler2D color_texture;
vec4 cubic(float x) {
float x2 = x * x;
float x3 = x2 * x;
return vec4(1.0, x, x2, x3) * transpose(mat4x4(
1.0, 16.0, 1.0, 0.0,
-9.0, 0.0, 9.0, 0.0,
15.0, -36.0, 27.0, -6.0,
-7.0, 21.0, -21.0, 7.0
) * (1.0 / 18.0));
}
vec4 textureBicubic(sampler2D samp, vec2 uv) {
vec2 tex_size = vec2(textureSize(samp, 0));
vec2 cc_tex = uv * tex_size - 0.5f;
vec2 fex = cc_tex - floor(cc_tex);
vec4 xcubic = cubic(fex.x);
vec4 ycubic = cubic(fex.y);
vec4 c = floor(cc_tex).xxyy + vec2(-0.5f, 1.5f).xyxy;
vec4 z = vec4(xcubic.yw, ycubic.yw);
vec4 s = vec4(xcubic.xz, ycubic.xz) + z;
vec4 offset = (c + z / s) * (1.0f / tex_size).xxyy;
vec2 n = vec2(s.x / (s.x + s.y), s.z / (s.z + s.w));
return mix(
mix(texture(samp, offset.yw), texture(samp, offset.xw), n.x),
mix(texture(samp, offset.yz), texture(samp, offset.xz), n.x),
n.y);
}
void main() {
color = textureBicubic(color_texture, frag_tex_coord);
}
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