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/*
* 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"
namespace blender::compositor {
DisplaceSimpleOperation::DisplaceSimpleOperation()
{
this->addInputSocket(DataType::Color);
this->addInputSocket(DataType::Vector);
this->addInputSocket(DataType::Value);
this->addInputSocket(DataType::Value);
this->addOutputSocket(DataType::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;
}
} // namespace blender::compositor
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