feat: opengl point rendering

src/Gui/Viewport/GLPoints.h

@@ -0,0 +1,43 @@
+#pragma once
+#include "Engine/Types.h"
+#include <GL/gl.h>
+#include <QOpenGLFunctions_3_3_Core>
+#include <glm/ext/vector_float3.hpp>
+#include <qopenglversionfunctions.h>
+#include "Engine/Operator/Geometry.h"
+#include "Gui/Viewport/GLCamera.h"
+
+struct Point
+{
+    glm::vec3 position;
+    float scale;
+};
+
+class GLPoints
+: protected QOpenGLFunctions_3_3_Core
+{
+public:
+    GLPoints();
+    GLuint vao;
+
+    GLuint billboardVertexBuffer_;
+    GLuint pointDataBuffer_;
+    GLuint shaderProgram;
+
+
+
+    std::vector<GLint> faceIndexData;
+    std::vector<Point> points_;
+
+    enzo::ga::Offset pointCount;
+
+    void init();
+    void initBuffers();
+    void initShaderProgram();
+    void setPoints(enzo::geo::Geometry& geometry, GLCamera& camera);
+    void updatePointSize(GLCamera& camera);
+    void useProgram();
+    void bind();
+    void unbind();
+    void draw();
+};