From 841ede5c34a5cb001b540ed13a8439dc8df7d2a9 Mon Sep 17 00:00:00 2001
From: Samuel Fadel <samuelfadel@gmail.com>
Date: Sat, 19 Dec 2015 22:11:33 +0100
Subject: Experimenting using VoronoiSplat as a texture.

---
 voronoisplat.h | 91 +++++++++++++++-------------------------------------------
 1 file changed, 23 insertions(+), 68 deletions(-)

(limited to 'voronoisplat.h')

diff --git a/voronoisplat.h b/voronoisplat.h
index 5913218..78dfd3e 100644
--- a/voronoisplat.h
+++ b/voronoisplat.h
@@ -1,26 +1,31 @@
 #ifndef VORONOISPLAT_H
 #define VORONOISPLAT_H
 
-#include <QQuickFramebufferObject>
+#include <QSGDynamicTexture>
 #include <QOpenGLFunctions>
-#include <QOpenGLBuffer>
 #include <QOpenGLShaderProgram>
 #include <QOpenGLVertexArrayObject>
 #include <armadillo>
 
 #include "colorscale.h"
 
-class VoronoiSplat; // defined after this class
-
-class VoronoiSplatRenderer
-    : public QQuickFramebufferObject::Renderer
+class VoronoiSplatTexture
+    : public QSGDynamicTexture
 {
 public:
     // 'size' must be square (and power of 2)
-    VoronoiSplatRenderer(const QSize &size);
-    ~VoronoiSplatRenderer();
+    VoronoiSplatTexture(const QSize &size);
+    virtual ~VoronoiSplatTexture();
+
+    void bind();
 
-    void synchronize(QQuickFramebufferObject *item);
+    // When true is returned, should probably call resetOpenGLState() on 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);
@@ -29,79 +34,29 @@ public:
     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();
+    void setColormap(const ColorScale *scale);
 
 private:
     void setupShaders();
     void setupVAOs();
     void setupTextures();
-    void copyPoints(const arma::mat &points);
+
+    void updateSites();
+    void updateValues();
+    void updateColormap();
     void computeDT();
 
-    VoronoiSplat *m_item;
     QOpenGLFunctions gl;
     QOpenGLShaderProgram *m_program1, *m_program2;
+    GLuint m_FBO;
     GLuint m_VBOs[3];
-    GLuint m_textures[2], m_colorMapTex;
+    GLuint m_textures[2], m_colormapTex, m_tex;
     QOpenGLVertexArrayObject m_sitesVAO, m_2ndPassVAO;
 
-    std::vector<float> m_sites, m_values;
+    std::vector<float> m_sites, m_values, m_cmap;
     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;
+    bool m_sitesUpdated, m_valuesUpdated, m_colormapUpdated;
 };
 
 #endif // VORONOISPLAT_H
-- 
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