Start day 26 Advanced Data and Advanced GLSL.

26-advanced-data-glsl/shaders/3.3.shader.vs

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+#version 330 core
+layout (location = 0) in vec3 aPos; // the position variable has attribute position 0
+layout (location = 1) in vec3 aColor;
+
+out vec3 ourColor;
+
+void main()
+{
+    gl_Position = vec4(aPos, 1.0); // see how we directly give a vec3 to vec4's constructor
+    ourColor = aColor;
+}