103 lines
2.2 KiB
Go
103 lines
2.2 KiB
Go
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package camera
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import (
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"zworld/engine/object"
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"zworld/engine/renderapi"
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"zworld/engine/renderapi/color"
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"zworld/plugins/math/mat4"
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"zworld/plugins/math/vec3"
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)
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// Camera Group
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type Object struct {
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object.Object
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*Camera
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}
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// Camera Component
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type Camera struct {
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object.Component
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Args
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Viewport renderapi.Screen
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Aspect float32
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Proj mat4.T
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View mat4.T
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ViewInv mat4.T
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ViewProj mat4.T
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ViewProjInv mat4.T
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Eye vec3.T
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Forward vec3.T
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}
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type Args struct {
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Fov float32
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Near float32
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Far float32
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Clear color.T
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}
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// New creates a new camera component.
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func New(args Args) *Camera {
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return object.NewComponent(&Camera{
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Args: args,
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Aspect: 1,
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})
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}
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func NewObject(args Args) *Object {
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return object.New("Camera", &Object{
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Camera: New(args),
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})
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}
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func (cam *Object) Name() string { return "Camera" }
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// Unproject screen space coordinates into world space
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func (cam *Camera) Unproject(pos vec3.T) vec3.T {
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// screen space -> clip space
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pos.Y = 1 - pos.Y
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pos = pos.Scaled(2).Sub(vec3.One)
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// unproject to world space by multiplying inverse view-projection
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return cam.ViewProjInv.TransformPoint(pos)
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}
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func (cam *Camera) RenderArgs(screen renderapi.Screen) renderapi.Args {
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// todo: passing the global viewport allows the camera to modify the actual render viewport
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// update view & view-projection matrices
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cam.Viewport = screen
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cam.Aspect = float32(cam.Viewport.Width) / float32(cam.Viewport.Height)
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cam.Proj = mat4.Perspective(cam.Fov, cam.Aspect, cam.Near, cam.Far)
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// calculate the view matrix.
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// should be the inverse of the cameras transform matrix
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tf := cam.Transform()
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cam.Eye = tf.WorldPosition()
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cam.Forward = tf.Forward()
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cam.ViewInv = tf.Matrix()
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cam.View = cam.ViewInv.Invert()
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cam.ViewProj = cam.Proj.Mul(&cam.View)
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cam.ViewProjInv = cam.ViewProj.Invert()
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return renderapi.Args{
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Viewport: cam.Viewport,
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Near: cam.Near,
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Far: cam.Far,
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Fov: cam.Fov,
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Projection: cam.Proj,
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View: cam.View,
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ViewInv: cam.ViewInv,
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VP: cam.ViewProj,
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VPInv: cam.ViewProjInv,
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MVP: cam.ViewProj,
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Clear: cam.Clear,
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Position: cam.Transform().WorldPosition(),
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Forward: cam.Transform().Forward(),
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}
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}
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