Additional resources from the Raylib repo.

Examples/resources/shaders/glsl120/gbuffer.fs

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+#version 120
+
+// Input vertex attributes (from vertex shader)
+varying vec3 fragPosition;
+varying vec2 fragTexCoord;
+varying vec3 fragNormal;
+varying vec4 fragColor;
+
+// TODO: Is there some alternative for GLSL100
+//layout (location = 0) out vec3 gPosition;
+//layout (location = 1) out vec3 gNormal;
+//layout (location = 2) out vec4 gAlbedoSpec;
+//uniform vec3 gPosition;
+//uniform vec3 gNormal;
+//uniform vec4 gAlbedoSpec;
+
+// Input uniform values
+uniform sampler2D texture0;  // Diffuse texture
+uniform sampler2D specularTexture;
+
+void main()
+{
+    // Store the fragment position vector in the first gbuffer texture
+    //gPosition = fragPosition;
+
+    // Store the per-fragment normals into the gbuffer
+    //gNormal = normalize(fragNormal);
+
+    // Store the diffuse per-fragment color
+    gl_FragColor.rgb = texture2D(texture0, fragTexCoord).rgb;
+
+    // Store specular intensity in gAlbedoSpec's alpha component
+    gl_FragColor.a = texture2D(specularTexture, fragTexCoord).r;
+}