| 122 | } |
| 123 | |
| 124 | void Terrain::OnCameraMotion() |
| 125 | { |
| 126 | // Get the camera location/direction in the model space of the terrain. |
| 127 | Vector4<float> worldEye = mCamera->GetPosition(); |
| 128 | #if defined(GTE_USE_VEC_MAT) |
| 129 | Vector4<float> modelEye = worldEye * worldTransform.Inverse(); |
| 130 | #else |
| 131 | Vector4<float> modelEye = worldTransform.Inverse() * worldEye; |
| 132 | #endif |
| 133 | |
| 134 | // Update the model-space origins of the terrain pages. Start the |
| 135 | // process by locating the page that contains the camera. |
| 136 | size_t newCameraCol = static_cast<size_t>(std::floor(modelEye[0] / mLength)); |
| 137 | size_t newCameraRow = static_cast<size_t>(std::floor(modelEye[1] / mLength)); |
| 138 | if (newCameraCol != mCameraCol || newCameraRow != mCameraRow) |
| 139 | { |
| 140 | mCameraCol = newCameraCol; |
| 141 | mCameraRow = newCameraRow; |
| 142 | |
| 143 | // Translate page origins for toroidal wraparound. |
| 144 | int32_t cminO = static_cast<int32_t>(mCameraCol) - static_cast<int32_t>(mNumCols / 2); |
| 145 | int32_t cminP = (cminO + static_cast<int32_t>(mNumCols)) % static_cast<int32_t>(mNumCols); |
| 146 | int32_t rminO = static_cast<int32_t>(mCameraRow) - static_cast<int32_t>(mNumRows / 2); |
| 147 | int32_t rminP = (rminO + static_cast<int32_t>(mNumRows)) % static_cast<int32_t>(mNumRows); |
| 148 | |
| 149 | int32_t rO = rminO, rP = rminP; |
| 150 | for (size_t row = 0; row < mNumRows; ++row) |
| 151 | { |
| 152 | int32_t cO = cminO, cP = cminP; |
| 153 | for (size_t col = 0; col < mNumCols; ++col) |
| 154 | { |
| 155 | auto const& child = mChild[cP + mNumCols * rP]; |
| 156 | auto page = std::dynamic_pointer_cast<Page>(child); |
| 157 | Vector2<float> oldOrigin = page->GetOrigin(); |
| 158 | Vector2<float> newOrigin{ cO * mLength, rO * mLength }; |
| 159 | Vector3<float> pageTrn |
| 160 | { |
| 161 | newOrigin[0] - oldOrigin[0], |
| 162 | newOrigin[1] - oldOrigin[1], |
| 163 | page->localTransform.GetTranslation()[2] |
| 164 | }; |
| 165 | page->localTransform.SetTranslation(pageTrn); |
| 166 | |
| 167 | ++cO; |
| 168 | if (++cP == static_cast<int32_t>(mNumCols)) |
| 169 | { |
| 170 | cP = 0; |
| 171 | } |
| 172 | } |
| 173 | |
| 174 | ++rO; |
| 175 | if (++rP == static_cast<int32_t>(mNumRows)) |
| 176 | { |
| 177 | rP = 0; |
| 178 | } |
| 179 | } |
| 180 | Update(); |
| 181 | } |
no test coverage detected