Added GPU skinning vertex shader to default pak

Author: ivansafrin

Assets/Default asset pack/default.pak

@@ -0,0 +1,63 @@
+#define MAX_JOINT_COUNT 64
+
+uniform mat4 skeletonMatrix[MAX_JOINT_COUNT];
+
+attribute vec4 vBoneIndices;
+attribute vec4 vBoneWeights;
+
+varying vec3 normal;
+varying vec4 pos;
+varying vec4 rawpos;
+varying vec4 vertexColor;
+
+
+mat3 m3( mat4 m )
+{
+	mat3 result;
+
+	result[0][0] = m[0][0]; 
+	result[0][1] = m[0][1]; 
+	result[0][2] = m[0][2]; 
+
+
+	result[1][0] = m[1][0]; 
+	result[1][1] = m[1][1]; 
+	result[1][2] = m[1][2]; 
+
+	result[2][0] = m[2][0]; 
+	result[2][1] = m[2][1]; 
+	result[2][2] = m[2][2]; 
+
+	return result;
+}
+
+
+void jointInfluence(in mat4 joint_matrix, in float weight, in vec4 position, inout vec4 outPosition, in vec3 normal, inout vec3 outNormal)
+{
+  outPosition += weight * (joint_matrix * position);
+
+  mat3 normalMatrix = m3(joint_matrix);
+  outNormal += weight * (normalMatrix * normal);
+}
+
+void main() {
+
+	vec4 inVert = gl_Vertex;
+	vec4 outVert = vec4(0.0, 0.0, 0.0, 0.0);
+
+	vec3 inNormal = gl_Normal;
+	vec3 outNormal = vec3(0.0, 0.0, 0.0);
+
+	jointInfluence(skeletonMatrix[int(vBoneIndices.x)], vBoneWeights.x, inVert, outVert, inNormal, outNormal);
+    jointInfluence(skeletonMatrix[int(vBoneIndices.y)], vBoneWeights.y, inVert, outVert, inNormal, outNormal);
+    jointInfluence(skeletonMatrix[int(vBoneIndices.z)], vBoneWeights.z, inVert, outVert, inNormal, outNormal);
+    jointInfluence(skeletonMatrix[int(vBoneIndices.w)], vBoneWeights.w, inVert, outVert, inNormal, outNormal);
+
+
+	normal = gl_NormalMatrix * outNormal;	
+	gl_Position = gl_ProjectionMatrix * gl_ModelViewMatrix * outVert;
+	pos = gl_ModelViewMatrix * outVert;
+	rawpos = outVert;
+    vertexColor = gl_Color;
+	gl_TexCoord[0] = gl_TextureMatrix[0] * gl_MultiTexCoord0;
+}