GUI: Box drawing

assets/shaders/gui_image.frag

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+#version 460
+#extension GL_EXT_nonuniform_qualifier : require
+#extension GL_EXT_scalar_block_layout : require
+#extension GL_EXT_shader_16bit_storage : require
+
+in Varyings {
+    layout(location = 0) flat uint instance;
+    layout(location = 1) vec2 texCoord;
+} var;
+
+#include "includes/gui_image_common.glsl"
+
+layout(location = 0) out vec4 fragColor;
+
+#define IMAGE _Images[var.instance]
+
+void main() {
+    vec4 texel = texture(sampler2D(_Textures[uint(IMAGE.textureId)], _Sampler), var.texCoord);
+    fragColor = texel * IMAGE.tint;
+}