Commit of work up to day 11 of learnopengl.com.

05-coordinate_systems/shaders/4.2.texture.fs

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+#version 330 core
+
+out vec4 FragColor;
+in vec2 TexCoord;
+
+uniform sampler2D texture1;
+uniform sampler2D texture2;
+
+void main()
+{
+  FragColor = mix(texture(texture1, TexCoord), texture(texture2, TexCoord), 0.2);
+}