update resources

resources/shaders/140/printbed.fs

@@ -0,0 +1,29 @@
+#version 140
+const vec3 back_color_dark  = vec3(0.235, 0.235, 0.235);
+const vec3 back_color_light = vec3(0.365, 0.365, 0.365);
+uniform sampler2D u_sampler;
+uniform bool transparent_background;
+uniform bool svg_source;
+in vec2 tex_coord;
+out vec4 frag_color;
+vec4 svg_color(vec2 uv)
+{
+    // takes foreground from u_sampler
+    vec4 fore_color = texture(u_sampler, uv);
+    // calculates radial gradient
+    vec3 back_color = vec3(mix(back_color_light, back_color_dark, smoothstep(0.0, 0.5, length(abs(uv) - vec2(0.5)))));
+    // blends foreground with background
+    return vec4(mix(back_color, fore_color.rgb, fore_color.a), transparent_background ? fore_color.a : 1.0);
+}
+vec4 non_svg_color(vec2 uv)
+{
+    // takes foreground from u_sampler
+    vec4 color = texture(u_sampler, uv);
+    return vec4(color.rgb, transparent_background ? color.a * 0.25 : color.a);
+}
+void main()
+{
+    // flip uv
+    vec2 uv = vec2(tex_coord.x, 1.0 - tex_coord.y);
+    frag_color = svg_source ? svg_color(uv) : non_svg_color(uv);
+}