Added overlay shaders

gui/resources/shaders/overlayShader.frag

+#version 410 core
+
+out vec4 FragColor;
+
+in vec2 tex_coord;
+
+uniform sampler2D imTexture;
+
+void main(){
+		FragColor = texture(imTexture, tex_coord);
+		FragColor.a = 1.f;
+}
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gui/resources/shaders/overlayShader.vert

+#version 410 core
+
+layout (location = 0) in vec2 pos;
+layout (location = 1) in vec2 texuv;
+
+uniform mat4 model;
+uniform mat4 view;
+uniform mat4 projection;
+
+uniform float opacity;
+uniform float radians;
+uniform vec2 offset;
+uniform float scale;
+
+out vec2 tex_coord;
+
+void main(){
+    vec2 pos_adjusted = scale * pos + offset;
+    gl_Position = projection*view*model*vec4(pos_adjusted[0], pos_adjusted[1], 0.f, 1.f);
+    tex_coord = texuv;
+}
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