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feat(ui): implement CSimpleCamera::SetFacing with forward vector

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fallenoak 2026-02-15 20:12:01 -06:00
parent 86084516cd
commit 0e6f65f32e
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1 changed files with 52 additions and 1 deletions
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53
src/ui/simple/CSimpleCamera.cpp
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@ -1,4 +1,55 @@
#include "ui/simple/CSimpleCamera.hpp"
#include <tempest/Math.hpp>
namespace {
void FaceDirection(const C3Vector& direction, C3Vector& xPrime, C3Vector& yPrime, C3Vector& zPrime) {
STORM_ASSERT(CMath::fnotequal(direction.SquaredMag(), 0.0f));
// Forward
xPrime = direction;
// Right
if (CMath::fequal(xPrime.SquaredMag(), 0.0f)) {
yPrime.x = 1.0f;
yPrime.y = 0.0f;
yPrime.z = 0.0f;
} else {
yPrime.x = -xPrime.y;
yPrime.y = xPrime.x;
yPrime.z = 0.0f;
CMath::normalize(yPrime.x, yPrime.y);
}
// Up (Forward cross Right)
zPrime = C3Vector::Cross(xPrime, yPrime);
}
void BuildBillboardMatrix(const C3Vector& direction, C33Matrix& rotation) {
C3Vector xPrime = {};
C3Vector yPrime = {};
C3Vector zPrime = {};
FaceDirection(direction, xPrime, yPrime, zPrime);
// Forward
rotation.a0 = xPrime.x;
rotation.a1 = xPrime.y;
rotation.a2 = xPrime.z;
// Right
rotation.b0 = yPrime.x;
rotation.b1 = yPrime.y;
rotation.b2 = yPrime.z;
// Up
rotation.c0 = zPrime.x;
rotation.c1 = zPrime.y;
rotation.c2 = zPrime.z;
}
}
CSimpleCamera::CSimpleCamera(float nearZ, float farZ, float fov) {
this->float10 = 0.0f;
@ -24,7 +75,7 @@ C3Vector CSimpleCamera::Right() const {
}
void CSimpleCamera::SetFacing(const C3Vector& forward) {
// TODO
BuildBillboardMatrix(forward, this->m_facing);
}
void CSimpleCamera::SetFacing(const C3Vector& forward, const C3Vector& up) {