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Add Ortho func

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bloeys
2021-11-09 10:13:58 +04:00
parent 175d05420c
commit 300c699e65
1 changed files with 15 additions and 0 deletions
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15
gglm/transform.go
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@ -117,6 +117,7 @@ func LookAt(pos, targetPos, worldUp *Vec3) *TrMat {
} }
} }
//Perspective creates a perspective projection matrix
func Perspective(fov, aspectRatio, nearClip, farClip float32) *Mat4 { func Perspective(fov, aspectRatio, nearClip, farClip float32) *Mat4 {
halfFovTan := float32(math.Tan(float64(fov * 0.5))) halfFovTan := float32(math.Tan(float64(fov * 0.5)))
return &Mat4{ return &Mat4{
@ -129,6 +130,20 @@ func Perspective(fov, aspectRatio, nearClip, farClip float32) *Mat4 {
} }
} }
//Perspective creates an orthographic projection matrix
func Ortho(left, right, top, bottom, nearClip, farClip float32) *TrMat {
return &TrMat{
Mat4: Mat4{
Data: [4][4]float32{
{2 / (right - left), 0, 0, 0},
{0, 2 / (top - bottom), 0, 0},
{0, 0, -2 / (farClip - nearClip), 0},
{-(right + left) / (right - left), -(top + bottom) / (top - bottom), -(farClip + nearClip) / (farClip - nearClip), 1},
},
},
}
}
func NewTrMatId() *TrMat { func NewTrMatId() *TrMat {
return &TrMat{ return &TrMat{
Mat4: *NewMat4Id(), Mat4: *NewMat4Id(),