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#include "colormap.h"
#include <algorithm>
#include <glad/gl.h>
class ColormapTexture
{
public:
ColormapTexture(const std::vector<float> &cmap,
Colormap::Orientation orientation = Colormap::Horizontal);
~ColormapTexture();
bool hasAlphaChannel() const { return false; }
bool hasMipmaps() const { return false; }
void bind();
bool updateTexture();
int textureId() const { return m_texture; }
size_t width() const { return m_width; }
size_t height() const { return m_height; }
void setOrientation(Colormap::Orientation orientation);
private:
Colormap::Orientation m_orientation;
// QSize m_size;
size_t m_width, m_height;
GLuint m_texture;
const std::vector<float> &m_cmap;
};
ColormapTexture::ColormapTexture(const std::vector<float> &cmap,
Colormap::Orientation orientation)
: m_cmap(cmap)
, m_width(0)
, m_height(0)
{
// Setup OpenGL texture
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);
setOrientation(orientation);
}
ColormapTexture::~ColormapTexture()
{
glDeleteTextures(1, &m_texture);
}
void ColormapTexture::bind()
{
glBindTexture(GL_TEXTURE_2D, m_texture);
}
void ColormapTexture::setOrientation(Colormap::Orientation orientation)
{
if (m_orientation == orientation) {
return;
}
m_orientation = orientation;
updateTexture();
}
bool ColormapTexture::updateTexture()
{
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_RGB, m_width, m_height,
0, GL_RGB, GL_FLOAT, m_cmap.data());
return true;
}
Colormap::Colormap()
: m_shouldUpdateTexture(false)
, m_orientation(Colormap::Horizontal)
{
}
Colormap::~Colormap()
{
}
void Colormap::update()
{
}
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_shouldUpdateOrientation = 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();
}
/*
QSGNode *Colormap::newSceneGraph()
{
QSGSimpleTextureNode *node = new QSGSimpleTextureNode;
m_texture = new ColormapTexture(m_cmap);
node->setTexture(m_texture);
node->setOwnsTexture(false);
node->setSourceRect(0, 0, m_texture->width(), m_texture->height());
return node;
}
QSGNode *Colormap::updatePaintNode(QSGNode *oldNode, UpdatePaintNodeData *)
{
QSGNode *root = oldNode ? oldNode : newSceneGraph();
QSGSimpleTextureNode *node = static_cast<QSGSimpleTextureNode *>(root);
node->setRect(x(), y(), width(), height());
ColormapTexture *texture = static_cast<ColormapTexture *>(m_texture);
if (m_shouldUpdateOrientation) {
texture->setOrientation(m_orientation);
m_shouldUpdateOrientation = false;
}
if (m_shouldUpdateTexture) {
texture->updateTexture();
m_shouldUpdateTexture = false;
}
return root;
}
*/
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