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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;
}
void DisplaceOperation::executePixelSampled(float output[4], float x, float y, PixelSampler sampler)
{
float xy[2] = { x, y };
float uv[2], deriv[2][2];
pixelTransform(xy, uv, deriv);
/* EWA filtering (without nearest it gets blurry with NO distortion) */
this->m_inputColorProgram->readFiltered(output, uv[0], uv[1], deriv[0], deriv[1], COM_PS_BILINEAR);
}
bool DisplaceOperation::read_displacement(float x, float y, float xscale, float yscale, const float origin[2], float &r_u, float &r_v)
{
float width = m_inputVectorProgram->getWidth();
float height = m_inputVectorProgram->getHeight();
if (x < 0.0f || x >= width || y < 0.0f || y >= height) {
r_u = 0.0f;
r_v = 0.0f;
return false;
}
else {
float col[4];
m_inputVectorProgram->readSampled(col, x, y, COM_PS_BILINEAR);
r_u = origin[0] - col[0] * xscale + 0.5f;
r_v = origin[1] - col[1] * yscale + 0.5f;
return true;
}
}
void DisplaceOperation::pixelTransform(const float xy[2], float r_uv[2], float r_deriv[2][2])
{
float col[4];
float uv[2]; /* temporary variables for derivative estimation */
int num;
m_inputScaleXProgram->readSampled(col, xy[0], xy[1], COM_PS_NEAREST);
float xs = col[0];
m_inputScaleYProgram->readSampled(col, xy[0], xy[1], COM_PS_NEAREST);
float ys = col[0];
/* clamp x and y displacement to triple image resolution -
* to prevent hangs from huge values mistakenly plugged in eg. z buffers */
CLAMP(xs, -m_width_x4, m_width_x4);
CLAMP(ys, -m_height_x4, m_height_x4);
/* displaced pixel in uv coords, for image sampling */
read_displacement(xy[0], xy[1], xs, ys, xy, r_uv[0], r_uv[1]);
/* Estimate partial derivatives using 1-pixel offsets */
const float epsilon[2] = { 1.0f, 1.0f };
zero_v2(r_deriv[0]);
zero_v2(r_deriv[1]);
num = 0;
if (read_displacement(xy[0] + epsilon[0], xy[1], xs, ys, xy, uv[0], uv[1])) {
r_deriv[0][0] += uv[0] - r_uv[0];
r_deriv[1][0] += uv[1] - r_uv[1];
++num;
}
if (read_displacement(xy[0] - epsilon[0], xy[1], xs, ys, xy, uv[0], uv[1])) {
r_deriv[0][0] += r_uv[0] - uv[0];
r_deriv[1][0] += r_uv[1] - uv[1];
++num;
}
if (num > 0) {
float numinv = 1.0f / (float)num;
r_deriv[0][0] *= numinv;
r_deriv[1][0] *= numinv;
}
num = 0;
if (read_displacement(xy[0], xy[1] + epsilon[1], xs, ys, xy, uv[0], uv[1])) {
r_deriv[0][1] += uv[0] - r_uv[0];
r_deriv[1][1] += uv[1] - r_uv[1];
++num;
}
if (read_displacement(xy[0], xy[1] - epsilon[1], xs, ys, xy, uv[0], uv[1])) {
r_deriv[0][1] += r_uv[0] - uv[0];
r_deriv[1][1] += r_uv[1] - uv[1];
++num;
}
if (num > 0) {
float numinv = 1.0f / (float)num;
r_deriv[0][1] *= numinv;
r_deriv[1][1] *= numinv;
}
}
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 + 1;
vectorInput.xmin = input->xmin - 1;
vectorInput.ymax = input->ymax + 1;
vectorInput.ymin = input->ymin - 1;
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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