Additional resources from the Raylib repo.

Examples/resources/shaders/glsl330/gbuffer.fs

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+#version 330 core
+layout (location = 0) out vec3 gPosition;
+layout (location = 1) out vec3 gNormal;
+layout (location = 2) out vec4 gAlbedoSpec;
+
+in vec3 fragPosition;
+in vec2 fragTexCoord;
+in vec3 fragNormal;
+
+uniform sampler2D diffuseTexture;
+uniform sampler2D specularTexture;
+
+void main()
+{
+    // store the fragment position vector in the first gbuffer texture
+    gPosition = fragPosition;
+    // also store the per-fragment normals into the gbuffer
+    gNormal = normalize(fragNormal);
+    // and the diffuse per-fragment color
+    gAlbedoSpec.rgb = texture(diffuseTexture, fragTexCoord).rgb;
+    // store specular intensity in gAlbedoSpec's alpha component
+    gAlbedoSpec.a = texture(specularTexture, fragTexCoord).r;
+}