diff options
Diffstat (limited to 'source/blender/compositor/operations/COM_DisplaceOperation.cpp')
-rw-r--r-- | source/blender/compositor/operations/COM_DisplaceOperation.cpp | 147 |
1 files changed, 147 insertions, 0 deletions
diff --git a/source/blender/compositor/operations/COM_DisplaceOperation.cpp b/source/blender/compositor/operations/COM_DisplaceOperation.cpp new file mode 100644 index 00000000000..b30ce5ac5b5 --- /dev/null +++ b/source/blender/compositor/operations/COM_DisplaceOperation.cpp @@ -0,0 +1,147 @@ +/* + * Copyright 2011, Blender Foundation. + * + * 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. + * + * Contributor: + * Dalai Felinto + */ + +#include "COM_DisplaceOperation.h" +#include "BLI_math.h" +#include "BLI_utildefines.h" + +DisplaceOperation::DisplaceOperation(): NodeOperation() { + 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->setComplex(true); + + this->inputColorProgram = NULL; + this->inputVectorProgram = NULL; + this->inputScaleXProgram = NULL; + this->inputScaleYProgram = NULL; +} + +void DisplaceOperation::initExecution() { + this->inputColorProgram = this->getInputSocketReader(0); + this->inputVectorProgram = this->getInputSocketReader(1); + this->inputScaleXProgram = this->getInputSocketReader(2); + this->inputScaleYProgram = this->getInputSocketReader(3); + + width_x4 = this->getWidth() * 4; + 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 DisplaceOperation::executePixel(float* color, int x, int y, MemoryBuffer *inputBuffers[], void* data) +{ + float inVector[4]; + float inScale[4]; + + float p_dx, p_dy; /* main displacement in pixel space */ + float d_dx, d_dy; + float dxt, dyt; + float u, v; + + this->inputScaleXProgram->read(inScale, x, y, COM_PS_NEAREST, inputBuffers); + float xs = inScale[0]; + this->inputScaleYProgram->read(inScale, x, y, COM_PS_NEAREST, inputBuffers); + 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, -width_x4, width_x4); + CLAMP(ys, -height_x4, height_x4); + + this->inputVectorProgram->read(inVector, x, y, COM_PS_NEAREST, inputBuffers); + p_dx = inVector[0] * xs; + p_dy = inVector[1] * ys; + + /* displaced pixel in uv coords, for image sampling */ + u = x - p_dx + 0.5f; + v = y - p_dy + 0.5f; + + /* calc derivatives */ + this->inputVectorProgram->read(inVector, x+1, y, COM_PS_NEAREST, inputBuffers); + d_dx = inVector[0] * xs; + this->inputVectorProgram->read(inVector, x, y+1, COM_PS_NEAREST, inputBuffers); + d_dy = inVector[0] * ys; + + /* clamp derivatives to minimum displacement distance in UV space */ + dxt = p_dx - d_dx; + dyt = p_dy - d_dy; + + dxt = signf(dxt)*maxf(fabsf(dxt), DISPLACE_EPSILON)/this->getWidth(); + dyt = signf(dyt)*maxf(fabsf(dyt), DISPLACE_EPSILON)/this->getHeight(); + + /* EWA filtering */ + this->inputColorProgram->read(color, u, v, dxt, dyt, inputBuffers); +} + +void DisplaceOperation::deinitExecution() { + this->inputColorProgram = NULL; + this->inputVectorProgram = NULL; + this->inputScaleXProgram = NULL; + this->inputScaleYProgram = NULL; +} + +bool DisplaceOperation::determineDependingAreaOfInterest(rcti *input, ReadBufferOperation *readOperation, rcti *output) { + rcti colorInput; + rcti vectorInput; + NodeOperation *operation=NULL; + + /* 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 */ + operation = getInputOperation(1); + vectorInput.xmax = input->xmax + 2; + vectorInput.xmin = input->xmin; + vectorInput.ymax = input->ymax + 2; + vectorInput.ymin = input->ymin; + if (operation->determineDependingAreaOfInterest(&vectorInput, 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; +} + |