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#ifndef VORONOISPLAT_H
#define VORONOISPLAT_H
#include <QSGDynamicTexture>
#include <QOpenGLFunctions>
#include <QOpenGLShaderProgram>
#include <QOpenGLVertexArrayObject>
#include <armadillo>
#include "colorscale.h"
class VoronoiSplatTexture
: public QSGDynamicTexture
{
public:
// 'size' must be square (and power of 2)
VoronoiSplatTexture(const QSize &size);
virtual ~VoronoiSplatTexture();
void bind();
// Call this whenever the texture should be updated (after changing the
// sites, values or colormap). When true is returned, should probably call
// resetOpenGLState() on QtQuick window
bool updateTexture();
bool hasAlphaChannel() const { return true; }
bool hasMipmaps() const { return false; }
int textureId() const { return m_tex; }
QSize textureSize() const { return m_size; }
// 'points' should be a 2D points matrix (each point in a row)
void setSites(const arma::mat &points);
// Set the value to be colormapped in each site
void setValues(const arma::vec &values);
// Set colormap data based on the given color scale;
void setColormap(const ColorScale *scale);
private:
void setupShaders();
void setupVAOs();
void setupTextures();
void updateSites();
void updateValues();
void updateColormap();
void computeDT();
QOpenGLFunctions gl;
QOpenGLShaderProgram *m_program1, *m_program2;
GLuint m_FBO;
GLuint m_VBOs[3];
GLuint m_textures[2], m_colormapTex, m_tex;
QOpenGLVertexArrayObject m_sitesVAO, m_2ndPassVAO;
std::vector<float> m_sites, m_values, m_cmap;
QSize m_size;
bool m_sitesChanged, m_valuesChanged, m_colormapChanged;
};
#endif // VORONOISPLAT_H
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