func gatherBuildingsPositions(
rendererPositions map[world.ModelId]Positions,
buildings world.Buildings,
offsetX, offsetY float64,
defaultR *glm.Matrix4, // Can be nil.
worldToEye glm.Matrix4,
) {
for coords, building := range buildings {
position := glm.Vector3{
float64(coords.X) + offsetX,
float64(coords.Y) + offsetY,
0,
}.Translation()
facer, ok := building.(world.Facer)
if ok {
// We obey the facing of the buildings that have one.
r := glm.RotZ(float64(90 * facer.Facing().Value()))
position = position.Mult(r)
} else {
// Buildings without facing receive the provided default facing.
// It is given as a precalculated rotation matrix `defaultR`.
position = position.Mult(*defaultR)
}
position = worldToEye.Mult(position) // Shaders work in view space.
rendererID := building.Model()
positions := rendererPositions[rendererID]
positions = append(positions, position)
rendererPositions[rendererID] = positions
}
}
func (buffer *CameraBuffer) SetEyeToWld(matrix glm.Matrix4) {
buffer.data[cameraBufferEyeToWld] = matrix.Gl()
buffer.bufferdataClean = false
}
