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/*
* Copyright 2012, 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_DisplaceSimpleOperation.h"
#include "BLI_math.h"
#include "BLI_utildefines.h"
DisplaceSimpleOperation::DisplaceSimpleOperation(): 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->inputColorProgram = NULL;
this->inputVectorProgram = NULL;
this->inputScaleXProgram = NULL;
this->inputScaleYProgram = NULL;
}
void DisplaceSimpleOperation::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 DisplaceSimpleOperation::executePixel(float* color, float x, float y, PixelSampler sampler, MemoryBuffer *inputBuffers[])
{
float inVector[4];
float inScale[4];
float p_dx, p_dy; /* main displacement in pixel space */
float u, v;
this->inputScaleXProgram->read(inScale, x, y, sampler, inputBuffers);
float xs = inScale[0];
this->inputScaleYProgram->read(inScale, x, y, sampler, 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, sampler, inputBuffers);
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.f, this->getWidth()-1.f);
CLAMP(v, 0.f, this->getHeight()-1.f);
this->inputColorProgram->read(color, u, v, sampler, inputBuffers);
}
void DisplaceSimpleOperation::deinitExecution() {
this->inputColorProgram = NULL;
this->inputVectorProgram = NULL;
this->inputScaleXProgram = NULL;
this->inputScaleYProgram = NULL;
}
bool DisplaceSimpleOperation::determineDependingAreaOfInterest(rcti *input, ReadBufferOperation *readOperation, rcti *output) {
rcti colorInput;
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 */
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;
}
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