diff options
Diffstat (limited to 'source/blender/compositor/operations/COM_DisplaceSimpleOperation.cc')
-rw-r--r-- | source/blender/compositor/operations/COM_DisplaceSimpleOperation.cc | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/source/blender/compositor/operations/COM_DisplaceSimpleOperation.cc b/source/blender/compositor/operations/COM_DisplaceSimpleOperation.cc new file mode 100644 index 00000000000..bbc4d63305b --- /dev/null +++ b/source/blender/compositor/operations/COM_DisplaceSimpleOperation.cc @@ -0,0 +1,131 @@ +/* + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software Foundation, + * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + * + * Copyright 2012, Blender Foundation. + */ + +#include "COM_DisplaceSimpleOperation.h" +#include "BLI_math.h" +#include "BLI_utildefines.h" + +DisplaceSimpleOperation::DisplaceSimpleOperation() +{ + this->addInputSocket(COM_DT_COLOR); + this->addInputSocket(COM_DT_VECTOR); + this->addInputSocket(COM_DT_VALUE); + this->addInputSocket(COM_DT_VALUE); + this->addOutputSocket(COM_DT_COLOR); + + this->m_inputColorProgram = nullptr; + this->m_inputVectorProgram = nullptr; + this->m_inputScaleXProgram = nullptr; + this->m_inputScaleYProgram = nullptr; +} + +void DisplaceSimpleOperation::initExecution() +{ + this->m_inputColorProgram = this->getInputSocketReader(0); + this->m_inputVectorProgram = this->getInputSocketReader(1); + this->m_inputScaleXProgram = this->getInputSocketReader(2); + this->m_inputScaleYProgram = this->getInputSocketReader(3); + + this->m_width_x4 = this->getWidth() * 4; + this->m_height_x4 = this->getHeight() * 4; +} + +/* minimum distance (in pixels) a pixel has to be displaced + * in order to take effect */ +// #define DISPLACE_EPSILON 0.01f + +void DisplaceSimpleOperation::executePixelSampled(float output[4], + float x, + float y, + PixelSampler sampler) +{ + float inVector[4]; + float inScale[4]; + + float p_dx, p_dy; /* main displacement in pixel space */ + float u, v; + + this->m_inputScaleXProgram->readSampled(inScale, x, y, sampler); + float xs = inScale[0]; + this->m_inputScaleYProgram->readSampled(inScale, x, y, sampler); + float ys = inScale[0]; + + /* clamp x and y displacement to triple image resolution - + * to prevent hangs from huge values mistakenly plugged in eg. z buffers */ + CLAMP(xs, -this->m_width_x4, this->m_width_x4); + CLAMP(ys, -this->m_height_x4, this->m_height_x4); + + this->m_inputVectorProgram->readSampled(inVector, x, y, sampler); + p_dx = inVector[0] * xs; + p_dy = inVector[1] * ys; + + /* displaced pixel in uv coords, for image sampling */ + /* clamp nodes to avoid glitches */ + u = x - p_dx + 0.5f; + v = y - p_dy + 0.5f; + CLAMP(u, 0.0f, this->getWidth() - 1.0f); + CLAMP(v, 0.0f, this->getHeight() - 1.0f); + + this->m_inputColorProgram->readSampled(output, u, v, sampler); +} + +void DisplaceSimpleOperation::deinitExecution() +{ + this->m_inputColorProgram = nullptr; + this->m_inputVectorProgram = nullptr; + this->m_inputScaleXProgram = nullptr; + this->m_inputScaleYProgram = nullptr; +} + +bool DisplaceSimpleOperation::determineDependingAreaOfInterest(rcti *input, + ReadBufferOperation *readOperation, + rcti *output) +{ + rcti colorInput; + NodeOperation *operation = nullptr; + + /* the vector buffer only needs a 2x2 buffer. The image needs whole buffer */ + /* image */ + operation = getInputOperation(0); + colorInput.xmax = operation->getWidth(); + colorInput.xmin = 0; + colorInput.ymax = operation->getHeight(); + colorInput.ymin = 0; + if (operation->determineDependingAreaOfInterest(&colorInput, readOperation, output)) { + return true; + } + + /* vector */ + if (operation->determineDependingAreaOfInterest(input, readOperation, output)) { + return true; + } + + /* scale x */ + operation = getInputOperation(2); + if (operation->determineDependingAreaOfInterest(input, readOperation, output)) { + return true; + } + + /* scale y */ + operation = getInputOperation(3); + if (operation->determineDependingAreaOfInterest(input, readOperation, output)) { + return true; + } + + return false; +} |