Additional resources from the Raylib repo.

Examples/resources/shaders/glsl330/normalmap.vs

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+#version 330
+
+// Input vertex attributes
+in vec3 vertexPosition;
+in vec2 vertexTexCoord;
+in vec3 vertexNormal;
+in vec4 vertexTangent;
+in vec4 vertexColor;
+
+// Input uniform values
+uniform mat4 mvp;
+uniform mat4 matModel;
+
+// Output vertex attributes (to fragment shader)
+out vec3 fragPosition;
+out vec2 fragTexCoord;
+out vec3 fragNormal; //used for when normal mapping is toggled off
+out vec4 fragColor;
+out mat3 TBN;
+
+void main()
+{
+    // Compute binormal from vertex normal and tangent. W component is the tangent handedness
+    vec3 vertexBinormal = cross(vertexNormal, vertexTangent.xyz)*vertexTangent.w;
+
+    // Compute fragment normal based on normal transformations
+    mat3 normalMatrix = transpose(inverse(mat3(matModel)));
+
+    // Compute fragment position based on model transformations
+    fragPosition = vec3(matModel*vec4(vertexPosition, 1.0));
+
+    //Create TBN matrix for transforming the normal map values from tangent-space to world-space
+    fragNormal = normalize(normalMatrix*vertexNormal);
+
+    vec3 fragTangent = normalize(normalMatrix*vertexTangent.xyz);
+    fragTangent = normalize(fragTangent - dot(fragTangent, fragNormal)*fragNormal);
+
+    vec3 fragBinormal = normalize(normalMatrix*vertexBinormal);
+    fragBinormal = cross(fragNormal, fragTangent);
+
+    TBN = transpose(mat3(fragTangent, fragBinormal, fragNormal));
+
+    fragColor = vertexColor;
+
+    fragTexCoord = vertexTexCoord;
+
+    gl_Position = mvp*vec4(vertexPosition, 1.0);
+}