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//##########################################################################
//# #
//# CLOUDCOMPARE #
//# #
//# 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; version 2 or later of the License. #
//# #
//# 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. #
//# #
//# COPYRIGHT: EDF R&D / TELECOM ParisTech (ENST-TSI) #
//# #
//##########################################################################
#include "ccColorRampShader.h"
//! Maximum color ramp size
/** 252 so as to get 1024 bytes as total required memory
(see MinRequiredBytes).
**/
static const unsigned CC_MAX_SHADER_COLOR_RAMP_SIZE = 256;
//! Buffer for converting a color scale to packed values before sending it to shader
static float s_packedColormapf[CC_MAX_SHADER_COLOR_RAMP_SIZE];
unsigned ccColorRampShader::MaxColorRampSize()
{
return CC_MAX_SHADER_COLOR_RAMP_SIZE;
}
GLint ccColorRampShader::MinRequiredBytes()
{
return (CC_MAX_SHADER_COLOR_RAMP_SIZE + 4) * 4;
}
ccColorRampShader::ccColorRampShader()
: ccShader()
{
}
bool ccColorRampShader::setup(QOpenGLFunctions_2_1* glFunc, float minSatRel, float maxSatRel, unsigned colorSteps, const ccColorScale::Shared& colorScale)
{
assert(glFunc);
if (colorSteps > CC_MAX_SHADER_COLOR_RAMP_SIZE)
{
colorSteps = CC_MAX_SHADER_COLOR_RAMP_SIZE;
}
setUniformValue("uf_minSaturation", minSatRel);
setUniformValue("uf_maxSaturation", maxSatRel);
setUniformValue("uf_colormapSize", static_cast<float>(colorSteps));
static const double resolution = static_cast<double>(1 << 24);
//set 'grayed' points color as a float-packed value
{
int rgb = (ccColor::lightGrey.a << 24) | (ccColor::lightGrey.r << 16) | (ccColor::lightGrey.g << 8) | ccColor::lightGrey.b;
float packedColorGray = static_cast<float>(rgb / resolution);
setUniformValue("uf_colorGray", packedColorGray);
}
//send colormap to shader
assert(colorScale);
for (unsigned i = 0; i < colorSteps; ++i)
{
const ccColor::Rgb* col = colorScale->getColorByRelativePos(static_cast<double>(i) / (colorSteps - 1), colorSteps);
//set ramp colors as float-packed values
int rgb = (col->r << 16) | (col->g << 8) | col->b;
s_packedColormapf[i] = static_cast<float>(rgb / resolution);
}
setUniformValueArray("uf_colormapTable", s_packedColormapf, colorSteps, 1);
return (glFunc->glGetError() == 0);
}
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