Additional resources from the Raylib repo.

Examples/resources/shaders/glsl330/skinning.vs

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+#version 330
+
+#define MAX_BONE_NUM 128
+
+// Input vertex attributes
+in vec3 vertexPosition;
+in vec2 vertexTexCoord;
+in vec4 vertexColor;
+in vec3 vertexNormal;
+in vec4 vertexBoneIndices;
+in vec4 vertexBoneWeights;
+
+// Input uniform values
+uniform mat4 mvp;
+uniform mat4 matNormal;
+uniform mat4 boneMatrices[MAX_BONE_NUM];
+
+// Output vertex attributes (to fragment shader)
+out vec2 fragTexCoord;
+out vec4 fragColor;
+out vec3 fragNormal;
+
+void main()
+{
+    int boneIndex0 = int(vertexBoneIndices.x);
+    int boneIndex1 = int(vertexBoneIndices.y);
+    int boneIndex2 = int(vertexBoneIndices.z);
+    int boneIndex3 = int(vertexBoneIndices.w);
+
+    vec4 skinnedPosition =
+        vertexBoneWeights.x*(boneMatrices[boneIndex0]*vec4(vertexPosition, 1.0)) +
+        vertexBoneWeights.y*(boneMatrices[boneIndex1]*vec4(vertexPosition, 1.0)) +
+        vertexBoneWeights.z*(boneMatrices[boneIndex2]*vec4(vertexPosition, 1.0)) +
+        vertexBoneWeights.w*(boneMatrices[boneIndex3]*vec4(vertexPosition, 1.0));
+
+    vec4 skinnedNormal =
+        vertexBoneWeights.x*(boneMatrices[boneIndex0]*vec4(vertexNormal, 0.0)) +
+        vertexBoneWeights.y*(boneMatrices[boneIndex1]*vec4(vertexNormal, 0.0)) +
+        vertexBoneWeights.z*(boneMatrices[boneIndex2]*vec4(vertexNormal, 0.0)) +
+        vertexBoneWeights.w*(boneMatrices[boneIndex3]*vec4(vertexNormal, 0.0));
+    skinnedNormal.w = 0.0;
+
+    fragTexCoord = vertexTexCoord;
+    fragColor = vertexColor;
+    fragNormal = normalize(vec3(matNormal*skinnedNormal));
+
+    gl_Position = mvp*skinnedPosition;
+}