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 /*
  *  SPDX-FileCopyrightText: 2020 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
  *  SPDX-License-Identifier: LGPL-2.0-or-later
  */
 
 #version 440
 
 #extension GL_GOOGLE_include_directive: enable
 #include "sdf_lowpower.glsl"
 // See sdf.glsl for the SDF related functions.
 
 // This shader renders a rectangle with rounded corners and a shadow below it.
 // In addition it renders a border around it.
 
 #include "uniforms.glsl"
 layout(binding = 1) uniform sampler2D textureSource;
 
 layout(location = 0) in lowp vec2 uv;
 layout(location = 0) out lowp vec4 out_color;
 
 const lowp float minimum_shadow_radius = 0.05;
 
 void main()
 {
     lowp vec4 col = vec4(0.0);
 
     // Calculate the outer rectangle distance field.
     lowp float outer_rect = sdf_rounded_rectangle(uv, ubuf.aspect, ubuf.radius);
 
     // Render it
     col = sdf_render(outer_rect, col, ubuf.borderColor);
 
     // Inner rectangle distance field equals outer reduced by twice the border width
     lowp float inner_rect = outer_rect + ubuf.borderWidth * 2.0;
 
     // Render it so we have a background for the image.
     col = sdf_render(inner_rect, col, ubuf.color);
 
     // Sample the texture, then render it, blending with the background color.
     lowp vec2 texture_uv = ((uv / ubuf.aspect) + 1.0) / 2.0;
     lowp vec4 texture_color = texture(textureSource, texture_uv);
     col = sdf_render(inner_rect, col, texture_color, texture_color.a, sdf_default_smoothing);
 
     out_color = col * ubuf.opacity;
 }