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101 lines
1.9 KiB
Go
Executable File
101 lines
1.9 KiB
Go
Executable File
package camera
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import (
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"github.com/bloeys/gglm/gglm"
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)
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type Type int32
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const (
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Type_Unknown Type = iota
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Type_Perspective
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Type_Orthographic
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)
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type Camera struct {
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Type Type
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Pos gglm.Vec3
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Forward gglm.Vec3
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WorldUp gglm.Vec3
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NearClip float32
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FarClip float32
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// Perspective data
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Fov float32
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AspectRatio float32
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// Ortho data
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Left, Right, Top, Bottom float32
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// Matrices
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ViewMat gglm.Mat4
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ProjMat gglm.Mat4
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}
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// Update recalculates view matrix and projection matrix.
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// Should be called whenever a camera parameter changes
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func (c *Camera) Update() {
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c.ViewMat = gglm.LookAtRH(&c.Pos, c.Pos.Clone().Add(&c.Forward), &c.WorldUp).Mat4
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if c.Type == Type_Perspective {
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c.ProjMat = gglm.Perspective(c.Fov, c.AspectRatio, c.NearClip, c.FarClip)
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} else {
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c.ProjMat = gglm.Ortho(c.Left, c.Right, c.Top, c.Bottom, c.NearClip, c.FarClip).Mat4
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}
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}
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// UpdateRotation calculates a new forward vector and then calls camera.Update()
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func (c *Camera) UpdateRotation(pitch, yaw float32) {
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dir := gglm.NewVec3(
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gglm.Cos32(yaw)*gglm.Cos32(pitch),
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gglm.Sin32(pitch),
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gglm.Sin32(yaw)*gglm.Cos32(pitch),
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)
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c.Forward = *dir.Normalize()
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c.Update()
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}
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func NewPerspective(pos, forward, worldUp *gglm.Vec3, nearClip, farClip, fovRadians, aspectRatio float32) Camera {
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cam := Camera{
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Type: Type_Perspective,
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Pos: *pos,
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Forward: *forward,
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WorldUp: *worldUp,
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NearClip: nearClip,
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FarClip: farClip,
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Fov: fovRadians,
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AspectRatio: aspectRatio,
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}
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cam.Update()
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return cam
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}
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func NewOrthographic(pos, forward, worldUp *gglm.Vec3, nearClip, farClip, left, right, top, bottom float32) Camera {
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cam := Camera{
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Type: Type_Orthographic,
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Pos: *pos,
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Forward: *forward,
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WorldUp: *worldUp,
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NearClip: nearClip,
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FarClip: farClip,
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Left: left,
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Right: right,
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Top: top,
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Bottom: bottom,
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}
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cam.Update()
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return cam
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}
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