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#include "colormap.h"
#include <algorithm>
#include <glad/gl.h>
Colormap::Colormap()
: m_width(0)
, m_height(0)
, m_shouldUpdateTexture(false)
, m_orientation(Colormap::Horizontal)
{
glGenTextures(1, &m_texture);
glBindTexture(GL_TEXTURE_2D, m_texture);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
}
Colormap::~Colormap()
{
glDeleteTextures(1, &m_texture);
}
void Colormap::update()
{
if (m_shouldUpdateTexture) {
updateTexture();
}
}
void Colormap::updateTexture()
{
if (m_cmap.empty()) {
return;
}
switch (m_orientation) {
case Colormap::Horizontal:
m_width = m_cmap.size() / 3;
m_height = 1;
break;
case Colormap::Vertical:
m_width = 1;
m_height = m_cmap.size() / 3;
break;
}
glBindTexture(GL_TEXTURE_2D, m_texture);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB32F, m_width, m_height,
0, GL_RGB, GL_FLOAT, m_cmap.data());
}
static void reverseCMap(std::vector<float> &cmap)
{
decltype(cmap.size()) i = 0, j = cmap.size() - 3;
while (i < j) {
std::swap(cmap[i++], cmap[j++]);
std::swap(cmap[i++], cmap[j++]);
std::swap(cmap[i++], cmap[j++]);
j -= 6;
}
}
void Colormap::setOrientation(Colormap::Orientation _orientation)
{
if (m_orientation == _orientation) {
return;
}
if (!m_cmap.empty()) {
reverseCMap(m_cmap);
}
m_orientation = _orientation;
m_shouldUpdateTexture = true;
update();
}
void Colormap::setColorScale(std::shared_ptr<const ColorScale> scale)
{
m_cmap.resize(SAMPLES * 3);
scale->sample(SAMPLES, m_cmap.data());
if (m_orientation == Colormap::Vertical) {
reverseCMap(m_cmap);
}
colorScaleChanged(scale);
m_shouldUpdateTexture = true;
update();
}
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