From d7dd95cd9eaa223ff8b86e84e6b1b488ff79bcd5 Mon Sep 17 00:00:00 2001
From: Samuel Fadel <samuelfadel@gmail.com>
Date: Sat, 19 Dec 2015 12:29:33 +0100
Subject: New rendering (VoronoiSplat) -- incomplete.

* Added voronoi-like splatting to points: the same technique from
  Messias et al., (2014)
* It is now possible to change the projection technique during
  runtime (possible, but still requires some work)
---
 voronoisplat.h | 103 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 103 insertions(+)
 create mode 100644 voronoisplat.h

(limited to 'voronoisplat.h')

diff --git a/voronoisplat.h b/voronoisplat.h
new file mode 100644
index 0000000..ce84e74
--- /dev/null
+++ b/voronoisplat.h
@@ -0,0 +1,103 @@
+#ifndef VORONOISPLAT_H
+#define VORONOISPLAT_H
+
+#include <QQuickFramebufferObject>
+#include <QOpenGLFunctions>
+#include <QOpenGLBuffer>
+#include <QOpenGLShaderProgram>
+#include <QOpenGLVertexArrayObject>
+#include <armadillo>
+
+#include "colorscale.h"
+
+class VoronoiSplat; // defined after this class
+
+class VoronoiSplatRenderer
+    : public QQuickFramebufferObject::Renderer
+{
+public:
+    // 'size' must be square (and power of 2); item is the QQuickFBO that
+    // creates this
+    VoronoiSplatRenderer(const QSize &size);
+    ~VoronoiSplatRenderer();
+
+    void synchronize(QQuickFramebufferObject *item);
+    // 'points' should be a 2D points matrix (each point in a row)
+    void setSites(const arma::mat &points);
+    void setValues(const arma::vec &values);
+    // Set colormap data based on the given color scale;
+    void setColorMap(const ColorScale *scale);
+
+    QOpenGLFramebufferObject *createFramebufferObject(const QSize & size);    
+    void render();
+
+private:
+    void setupShaders();
+    void setupTextures();
+    void copyPoints(const arma::mat &points);
+    void computeDT();
+
+    VoronoiSplat *m_item;
+    QOpenGLFunctions gl;
+    QOpenGLShaderProgram *m_program1, *m_program2;
+    GLuint m_VBOs[3];
+    GLuint m_textures[2], m_colorMapTex;
+    QOpenGLVertexArrayObject m_sitesVAO, m_2ndPassVAO;
+
+    std::vector<float> m_sites, m_values;
+    QSize m_size;
+};
+
+class VoronoiSplat
+    : public QQuickFramebufferObject
+{
+    Q_OBJECT
+public:
+    VoronoiSplat(QQuickItem *parent = 0);
+    Renderer *createRenderer() const;
+
+    const arma::mat &points() const { return m_points; }
+    const arma::vec &values() const { return m_values; }
+    const ColorScale *colorScale() const { return m_colorScale; }
+
+    bool colorScaleUpdated() const { return m_colorScaleUpdated; }
+    bool pointsUpdated() const { return m_pointsUpdated; }
+    bool valuesUpdated() const { return m_valuesUpdated; }
+
+public slots:
+    void setColorScale(const ColorScale *scale)
+    {
+        m_colorScale = scale;
+        m_colorScaleUpdated = true;
+        update();
+    }
+
+    void setPoints(const arma::mat &points)
+    {
+        m_points = points;
+        m_pointsUpdated = true;
+        update();
+    }
+
+    void setValues(const arma::vec &values)
+    {
+        m_values = values;
+        m_valuesUpdated = true;
+        update();
+    }
+
+    void setUpdated(bool updated)
+    {
+        m_colorScaleUpdated = updated;
+        m_pointsUpdated     = updated;
+        m_valuesUpdated     = updated;
+    }
+
+private:
+    bool m_colorScaleUpdated, m_pointsUpdated, m_valuesUpdated;
+    const ColorScale *m_colorScale;
+    arma::mat m_points;
+    arma::vec m_values;
+};
+
+#endif // VORONOISPLAT_H
-- 
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