Import .glb model file with animation

- improve movement controls
- TODO: allow more than one model, instance, and animation

res/glsl/model_vertex.glsl

@@ -0,0 +1,29 @@
+#version 450 core
+
+layout (location = 0) in vec3 position;
+layout (location = 1) in vec2 texCoord;
+layout (location = 2) in ivec4 jointIndices;
+layout (location = 3) in vec4 jointWeights;
+
+out vec3 textureCoord;
+
+uniform mat4 theModelMatrix;
+uniform mat4 theViewMatrix;
+uniform mat4 theProjMatrix;
+uniform mat4 theJointMatrices[64];
+uniform float texIndex;
+
+void main()
+{
+	mat4 skinMatrix =
+		jointWeights.x * theJointMatrices[jointIndices.x] +
+		jointWeights.y * theJointMatrices[jointIndices.y] +
+		jointWeights.z * theJointMatrices[jointIndices.z] +
+		jointWeights.w * theJointMatrices[jointIndices.w];
+	
+	vec4 localPos = skinMatrix * vec4(position, 1.0);
+	mat4 mvp = theProjMatrix * theViewMatrix * theModelMatrix;
+	
+	gl_Position = mvp * localPos;
+	textureCoord = vec3(texCoord.x, texCoord.y, texIndex);
+}