From fb23c8d47f6dcef429423256d8dddcc0f7184fc4 Mon Sep 17 00:00:00 2001
From: Samuel Fadel <samuel@nihil.ws>
Date: Sun, 4 Jun 2023 13:02:14 +0200
Subject: Further advances in nuklear port.

Rendering now looks similar to Qt version, needs a few tweaks:
* Proper multisampling
* Background

Missing features:
* Barcharts
* Interactivity (e.g. brushing/linking in all objects)
* History view of interactions
---
 colormap.cpp | 117 +++++++++--------------------------------------------------
 1 file changed, 18 insertions(+), 99 deletions(-)

(limited to 'colormap.cpp')

diff --git a/colormap.cpp b/colormap.cpp
index 08a3d61..0a9b4cc 100644
--- a/colormap.cpp
+++ b/colormap.cpp
@@ -3,69 +3,38 @@
 #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)
+Colormap::Colormap()
+    : m_width(0)
     , m_height(0)
+    , m_shouldUpdateTexture(false)
+    , m_orientation(Colormap::Horizontal)
 {
-    // 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);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 }
 
-ColormapTexture::~ColormapTexture()
+Colormap::~Colormap()
 {
     glDeleteTextures(1, &m_texture);
 }
 
-void ColormapTexture::bind()
+void Colormap::update()
 {
-    glBindTexture(GL_TEXTURE_2D, m_texture);
+    if (m_shouldUpdateTexture) {
+        updateTexture();
+    }
 }
 
-void ColormapTexture::setOrientation(Colormap::Orientation orientation)
+void Colormap::updateTexture()
 {
-    if (m_orientation == orientation) {
+    if (m_cmap.empty()) {
         return;
     }
 
-    m_orientation = orientation;
-    updateTexture();
-}
-
-bool ColormapTexture::updateTexture()
-{
     switch (m_orientation) {
     case Colormap::Horizontal:
         m_width = m_cmap.size() / 3;
@@ -78,23 +47,8 @@ bool ColormapTexture::updateTexture()
     }
 
     glBindTexture(GL_TEXTURE_2D, m_texture);
-    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, m_width, m_height,
+    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB32F, 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)
@@ -110,9 +64,9 @@ static void reverseCMap(std::vector<float> &cmap)
     }
 }
 
-void Colormap::setOrientation(Colormap::Orientation orientation)
+void Colormap::setOrientation(Colormap::Orientation _orientation)
 {
-    if (m_orientation == orientation) {
+    if (m_orientation == _orientation) {
         return;
     }
 
@@ -120,8 +74,8 @@ void Colormap::setOrientation(Colormap::Orientation orientation)
         reverseCMap(m_cmap);
     }
 
-    m_orientation = orientation;
-    m_shouldUpdateOrientation = true;
+    m_orientation = _orientation;
+    m_shouldUpdateTexture = true;
     update();
 }
 
@@ -138,38 +92,3 @@ void Colormap::setColorScale(std::shared_ptr<const ColorScale> 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;
-}
-*/
-- 
cgit v1.2.3