| 51 | } |
| 52 | |
| 53 | void TriTextureParameter::UsedWithScreenSize( float screenSize, float worldRadius, const std::vector<float>& uvDensities ) |
| 54 | { |
| 55 | if( m_textureRes ) |
| 56 | { |
| 57 | uint32_t requestedLod = 0; |
| 58 | if( m_textureLodEnabled && !uvDensities.empty() ) |
| 59 | { |
| 60 | size_t i = 0; |
| 61 | float resolution = 0; |
| 62 | |
| 63 | { |
| 64 | auto density = worldRadius * m_uvDensityScale[0]; |
| 65 | if( density > 0 ) |
| 66 | { |
| 67 | resolution = std::max( resolution, screenSize / density ); |
| 68 | } |
| 69 | } |
| 70 | |
| 71 | for( auto uv : uvDensities ) |
| 72 | { |
| 73 | auto scale = m_uvDensityScale[1 + i++]; |
| 74 | auto density = uv * scale; |
| 75 | if( density > 0 ) |
| 76 | { |
| 77 | resolution = std::max( resolution, screenSize / density ); |
| 78 | } |
| 79 | } |
| 80 | if( resolution != 0 ) |
| 81 | { |
| 82 | auto requestedResolution = std::max( 1.f, resolution ); |
| 83 | auto resolutionChange = (uint32_t)( m_textureRes->GetOriginalResolutionAsFloat() / requestedResolution ); |
| 84 | if( resolutionChange > 0 ) |
| 85 | { |
| 86 | // quickly calculate log2 of resolutionChange, which gives us the required LOD |
| 87 | #if __APPLE__ |
| 88 | requestedLod = 31 - (uint32_t)__builtin_clz( resolutionChange ); |
| 89 | #else |
| 90 | unsigned long reverse; |
| 91 | _BitScanReverse( &reverse, resolutionChange ); |
| 92 | requestedLod = reverse; |
| 93 | #endif |
| 94 | } |
| 95 | } |
| 96 | m_textureRes->RequestResolution( requestedLod ); |
| 97 | } |
| 98 | else |
| 99 | { |
| 100 | m_textureRes->RequestResolution( requestedLod ); |
| 101 | } |
| 102 | } |
| 103 | } |
| 104 | |
| 105 | // ------------------------------------------------------------- |
| 106 | // Description: |
nothing calls this directly
no test coverage detected