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Diffstat (limited to 'Source/OpenEXR/IlmImf/ImfEnvmap.cpp')
| -rw-r--r-- | Source/OpenEXR/IlmImf/ImfEnvmap.cpp | 328 |
1 files changed, 328 insertions, 0 deletions
diff --git a/Source/OpenEXR/IlmImf/ImfEnvmap.cpp b/Source/OpenEXR/IlmImf/ImfEnvmap.cpp new file mode 100644 index 0000000..fdb04ac --- /dev/null +++ b/Source/OpenEXR/IlmImf/ImfEnvmap.cpp @@ -0,0 +1,328 @@ +/////////////////////////////////////////////////////////////////////////// +// +// Copyright (c) 2004, Industrial Light & Magic, a division of Lucas +// Digital Ltd. LLC +// +// All rights reserved. +// +// Redistribution and use in source and binary forms, with or without +// modification, are permitted provided that the following conditions are +// met: +// * Redistributions of source code must retain the above copyright +// notice, this list of conditions and the following disclaimer. +// * Redistributions in binary form must reproduce the above +// copyright notice, this list of conditions and the following disclaimer +// in the documentation and/or other materials provided with the +// distribution. +// * Neither the name of Industrial Light & Magic nor the names of +// its contributors may be used to endorse or promote products derived +// from this software without specific prior written permission. +// +// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. +// +/////////////////////////////////////////////////////////////////////////// + + +//----------------------------------------------------------------------------- +// +// Environment maps +// +//----------------------------------------------------------------------------- + +#include <ImfEnvmap.h> +#include "ImathFun.h" +#include <algorithm> +#include <math.h> + +using namespace std; +using namespace Imath; + +namespace Imf { +namespace LatLongMap { + +V2f +latLong (const V3f &dir) +{ + float r = sqrt (dir.z * dir.z + dir.x * dir.x); + + float latitude = (r < abs (dir.y))? + acos (r / dir.length()) * sign (dir.y): + asin (dir.y / dir.length()); + + float longitude = (dir.z == 0 && dir.x == 0)? 0: atan2 (dir.x, dir.z); + + return V2f (latitude, longitude); +} + + +V2f +latLong (const Box2i &dataWindow, const V2f &pixelPosition) +{ + float latitude, longitude; + + if (dataWindow.max.y > dataWindow.min.y) + { + latitude = -M_PI * + ((pixelPosition.y - dataWindow.min.y) / + (dataWindow.max.y - dataWindow.min.y) - 0.5f); + } + else + { + latitude = 0; + } + + if (dataWindow.max.x > dataWindow.min.x) + { + longitude = -2 * M_PI * + ((pixelPosition.x - dataWindow.min.x) / + (dataWindow.max.x - dataWindow.min.x) - 0.5f); + } + else + { + longitude = 0; + } + + return V2f (latitude, longitude); +} + + +V2f +pixelPosition (const Box2i &dataWindow, const V2f &latLong) +{ + float x = latLong.y / (-2 * M_PI) + 0.5f; + float y = latLong.x / -M_PI + 0.5f; + + return V2f (x * (dataWindow.max.x - dataWindow.min.x) + dataWindow.min.x, + y * (dataWindow.max.y - dataWindow.min.y) + dataWindow.min.y); +} + + +V2f +pixelPosition (const Box2i &dataWindow, const V3f &direction) +{ + return pixelPosition (dataWindow, latLong (direction)); +} + + +V3f +direction (const Box2i &dataWindow, const V2f &pixelPosition) +{ + V2f ll = latLong (dataWindow, pixelPosition); + + return V3f (sin (ll.y) * cos (ll.x), + sin (ll.x), + cos (ll.y) * cos (ll.x)); +} + +} // namespace LatLongMap + + +namespace CubeMap { + +int +sizeOfFace (const Box2i &dataWindow) +{ + return min ((dataWindow.max.x - dataWindow.min.x + 1), + (dataWindow.max.y - dataWindow.min.y + 1) / 6); +} + + +Box2i +dataWindowForFace (CubeMapFace face, const Box2i &dataWindow) +{ + int sof = sizeOfFace (dataWindow); + Box2i dwf; + + dwf.min.x = 0; + dwf.min.y = int (face) * sof; + + dwf.max.x = dwf.min.x + sof - 1; + dwf.max.y = dwf.min.y + sof - 1; + + return dwf; +} + + +V2f +pixelPosition (CubeMapFace face, const Box2i &dataWindow, V2f positionInFace) +{ + Box2i dwf = dataWindowForFace (face, dataWindow); + V2f pos (0, 0); + + switch (face) + { + case CUBEFACE_POS_X: + + pos.x = dwf.min.x + positionInFace.y; + pos.y = dwf.max.y - positionInFace.x; + break; + + case CUBEFACE_NEG_X: + + pos.x = dwf.max.x - positionInFace.y; + pos.y = dwf.max.y - positionInFace.x; + break; + + case CUBEFACE_POS_Y: + + pos.x = dwf.min.x + positionInFace.x; + pos.y = dwf.max.y - positionInFace.y; + break; + + case CUBEFACE_NEG_Y: + + pos.x = dwf.min.x + positionInFace.x; + pos.y = dwf.min.y + positionInFace.y; + break; + + case CUBEFACE_POS_Z: + + pos.x = dwf.max.x - positionInFace.x; + pos.y = dwf.max.y - positionInFace.y; + break; + + case CUBEFACE_NEG_Z: + + pos.x = dwf.min.x + positionInFace.x; + pos.y = dwf.max.y - positionInFace.y; + break; + } + + return pos; +} + + +void +faceAndPixelPosition (const V3f &direction, + const Box2i &dataWindow, + CubeMapFace &face, + V2f &pif) +{ + int sof = sizeOfFace (dataWindow); + float absx = abs (direction.x); + float absy = abs (direction.y); + float absz = abs (direction.z); + + if (absx >= absy && absx >= absz) + { + if (absx == 0) + { + // + // Special case - direction is (0, 0, 0) + // + + face = CUBEFACE_POS_X; + pif = V2f (0, 0); + return; + } + + pif.x = (direction.y / absx + 1) / 2 * (sof - 1); + pif.y = (direction.z / absx + 1) / 2 * (sof - 1); + + if (direction.x > 0) + face = CUBEFACE_POS_X; + else + face = CUBEFACE_NEG_X; + } + else if (absy >= absz) + { + pif.x = (direction.x / absy + 1) / 2 * (sof - 1); + pif.y = (direction.z / absy + 1) / 2 * (sof - 1); + + if (direction.y > 0) + face = CUBEFACE_POS_Y; + else + face = CUBEFACE_NEG_Y; + } + else + { + pif.x = (direction.x / absz + 1) / 2 * (sof - 1); + pif.y = (direction.y / absz + 1) / 2 * (sof - 1); + + if (direction.z > 0) + face = CUBEFACE_POS_Z; + else + face = CUBEFACE_NEG_Z; + } +} + + +V3f +direction (CubeMapFace face, const Box2i &dataWindow, const V2f &positionInFace) +{ + int sof = sizeOfFace (dataWindow); + + V2f pos; + + if (sof > 1) + { + pos = V2f (positionInFace.x / (sof - 1) * 2 - 1, + positionInFace.y / (sof - 1) * 2 - 1); + } + else + { + pos = V2f (0, 0); + } + + V3f dir (1, 0, 0); + + switch (face) + { + case CUBEFACE_POS_X: + + dir.x = 1; + dir.y = pos.x; + dir.z = pos.y; + break; + + case CUBEFACE_NEG_X: + + dir.x = -1; + dir.y = pos.x; + dir.z = pos.y; + break; + + case CUBEFACE_POS_Y: + + dir.x = pos.x; + dir.y = 1; + dir.z = pos.y; + break; + + case CUBEFACE_NEG_Y: + + dir.x = pos.x; + dir.y = -1; + dir.z = pos.y; + break; + + case CUBEFACE_POS_Z: + + dir.x = pos.x; + dir.y = pos.y; + dir.z = 1; + break; + + case CUBEFACE_NEG_Z: + + dir.x = pos.x; + dir.y = pos.y; + dir.z = -1; + break; + } + + return dir; +} + +} // namespace CubeMap +} // namespace Imf |