source/blender/gpu/shaders/gpu_shader_instance_objectspace_variying_color_vert.glsl


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uniform mat4 ViewMatrix;
uniform mat4 ViewProjectionMatrix;

/* ---- Instantiated Attrs ---- */
in vec3 pos;
in vec3 nor;

/* ---- Per instance Attrs ---- */
in mat4 InstanceModelMatrix;
in vec4 color;

out vec3 normal;
flat out vec4 finalColor;

void main()
{
  mat4 ModelViewProjectionMatrix = ViewProjectionMatrix * InstanceModelMatrix;
  /* This is slow and run per vertex, but it's still faster than
   * doing it per instance on CPU and sending it on via instance attr. */
  mat3 NormalMatrix = transpose(inverse(mat3(ViewMatrix * InstanceModelMatrix)));

  gl_Position = ModelViewProjectionMatrix * vec4(pos, 1.0);
  normal = NormalMatrix * nor;

  finalColor = color;
}