Lukas Tönne
c566e408e4
Distinguish the 3 different methods for acquiring pixel color values (executePixel, executePixelSampled, executePixelFiltered). This makes it easier to keep track of the different sampling methods (and works nicer with IDEs that do code parsing). Differential Revision: http://developer.blender.org/D7
132 lines
3.9 KiB
C++
132 lines
3.9 KiB
C++
/*
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* Copyright 2012, Blender Foundation.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* Contributor:
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* Dalai Felinto
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*/
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#include "COM_DisplaceSimpleOperation.h"
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#include "BLI_math.h"
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#include "BLI_utildefines.h"
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DisplaceSimpleOperation::DisplaceSimpleOperation() : NodeOperation()
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{
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this->addInputSocket(COM_DT_COLOR);
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this->addInputSocket(COM_DT_VECTOR);
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this->addInputSocket(COM_DT_VALUE);
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this->addInputSocket(COM_DT_VALUE);
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this->addOutputSocket(COM_DT_COLOR);
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this->m_inputColorProgram = NULL;
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this->m_inputVectorProgram = NULL;
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this->m_inputScaleXProgram = NULL;
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this->m_inputScaleYProgram = NULL;
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}
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void DisplaceSimpleOperation::initExecution()
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{
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this->m_inputColorProgram = this->getInputSocketReader(0);
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this->m_inputVectorProgram = this->getInputSocketReader(1);
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this->m_inputScaleXProgram = this->getInputSocketReader(2);
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this->m_inputScaleYProgram = this->getInputSocketReader(3);
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this->m_width_x4 = this->getWidth() * 4;
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this->m_height_x4 = this->getHeight() * 4;
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}
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/* minimum distance (in pixels) a pixel has to be displaced
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* in order to take effect */
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// #define DISPLACE_EPSILON 0.01f
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void DisplaceSimpleOperation::executePixelSampled(float output[4], float x, float y, PixelSampler sampler)
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{
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float inVector[4];
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float inScale[4];
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float p_dx, p_dy; /* main displacement in pixel space */
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float u, v;
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this->m_inputScaleXProgram->readSampled(inScale, x, y, sampler);
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float xs = inScale[0];
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this->m_inputScaleYProgram->readSampled(inScale, x, y, sampler);
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float ys = inScale[0];
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/* clamp x and y displacement to triple image resolution -
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* to prevent hangs from huge values mistakenly plugged in eg. z buffers */
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CLAMP(xs, -this->m_width_x4, this->m_width_x4);
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CLAMP(ys, -this->m_height_x4, this->m_height_x4);
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this->m_inputVectorProgram->readSampled(inVector, x, y, sampler);
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p_dx = inVector[0] * xs;
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p_dy = inVector[1] * ys;
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/* displaced pixel in uv coords, for image sampling */
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/* clamp nodes to avoid glitches */
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u = x - p_dx + 0.5f;
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v = y - p_dy + 0.5f;
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CLAMP(u, 0.f, this->getWidth() - 1.f);
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CLAMP(v, 0.f, this->getHeight() - 1.f);
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this->m_inputColorProgram->readSampled(output, u, v, sampler);
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}
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void DisplaceSimpleOperation::deinitExecution()
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{
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this->m_inputColorProgram = NULL;
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this->m_inputVectorProgram = NULL;
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this->m_inputScaleXProgram = NULL;
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this->m_inputScaleYProgram = NULL;
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}
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bool DisplaceSimpleOperation::determineDependingAreaOfInterest(rcti *input, ReadBufferOperation *readOperation, rcti *output)
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{
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rcti colorInput;
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NodeOperation *operation = NULL;
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/* the vector buffer only needs a 2x2 buffer. The image needs whole buffer */
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/* image */
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operation = getInputOperation(0);
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colorInput.xmax = operation->getWidth();
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colorInput.xmin = 0;
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colorInput.ymax = operation->getHeight();
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colorInput.ymin = 0;
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if (operation->determineDependingAreaOfInterest(&colorInput, readOperation, output)) {
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return true;
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}
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/* vector */
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if (operation->determineDependingAreaOfInterest(input, readOperation, output)) {
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return true;
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}
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/* scale x */
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operation = getInputOperation(2);
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if (operation->determineDependingAreaOfInterest(input, readOperation, output) ) {
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return true;
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}
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/* scale y */
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operation = getInputOperation(3);
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if (operation->determineDependingAreaOfInterest(input, readOperation, output) ) {
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return true;
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}
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return false;
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}
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