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/*
* 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->m_inputColorProgram = NULL;
this->m_inputVectorProgram = NULL;
this->m_inputScaleXProgram = NULL;
this->m_inputScaleYProgram = NULL;
}
void DisplaceOperation::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 DisplaceOperation::executePixel(float output[4], int x, int y, 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->m_inputScaleXProgram->read(inScale, x, y, COM_PS_NEAREST);
float xs = inScale[0];
this->m_inputScaleYProgram->read(inScale, x, y, COM_PS_NEAREST);
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->read(inVector, x, y, COM_PS_NEAREST);
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->m_inputVectorProgram->read(inVector, x + 1, y, COM_PS_NEAREST);
d_dx = inVector[0] * xs;
this->m_inputVectorProgram->read(inVector, x, y + 1, COM_PS_NEAREST);
d_dy = inVector[1] * 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->m_inputColorProgram->read(output, u, v, dxt, dyt);
}
void DisplaceOperation::deinitExecution()
{
this->m_inputColorProgram = NULL;
this->m_inputVectorProgram = NULL;
this->m_inputScaleXProgram = NULL;
this->m_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;
}
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