57 lines
1.7 KiB
C++
57 lines
1.7 KiB
C++
#include "Contents/CameraFrame.h"
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#include "Contents/TerrainHeight.h"
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#include <bit>
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#include <cmath>
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namespace {
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float InverseLength(float squared) {
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const float root = std::sqrt(squared);
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return static_cast<float>(1.0 / static_cast<double>(root));
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}
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}
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// OFFSET: 0x00ADBAC0
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// FUNCTION: fn_17924
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void CameraFrame::Forward(const CameraState& camera, float* output) const {
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const float y = camera.target[1] - this->eye[1];
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const float x = camera.target[0] - this->eye[0];
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const float z = camera.target[2] - this->eye[2];
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output[1] = y;
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output[0] = x;
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output[2] = z;
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const float inverse = InverseLength((y * y + x * x) + z * z);
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output[0] = inverse * output[0];
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const float last = inverse * output[2];
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output[1] = inverse * output[1];
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output[2] = last;
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}
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// OFFSET: 0x00ADBB60
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// FUNCTION: fn_17925
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void CameraFrame::AlternateView(
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const CameraState& camera,
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float yaw,
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const TerrainHeight& terrain,
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AffineMatrix& output
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) const {
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constexpr float pi = 3.141592f;
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AffineMatrix orbit;
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orbit.SetXRotation((camera.pitch / 180.0f) * pi);
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orbit.RotateY((yaw / 180.0f) * pi);
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const float distance = -camera.distance;
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float eye[3];
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eye[0] = (((orbit.values[3] * 0.0f + orbit.values[0] * 0.0f) + distance * orbit.values[6]) + orbit.values[9]) +
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camera.target[0];
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eye[1] = (((orbit.values[4] * 0.0f + orbit.values[1] * 0.0f) + distance * orbit.values[7]) + orbit.values[10]) +
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camera.target[1];
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eye[2] = (((orbit.values[5] * 0.0f + orbit.values[2] * 0.0f) + distance * orbit.values[8]) + orbit.values[11]) +
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camera.target[2];
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const float height = terrain.Height(eye[0], eye[2]);
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if (eye[1] > height) {
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eye[1] = height;
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}
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output.LookAt(eye, camera.target, this->up);
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}
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