Clean opengl rendering.

src/graphics/opengl/OpenGlMeshPainter.h

@@ -0,0 +1,27 @@
+#pragma once
+
+#include <memory>
+#include <vector>
+
+class DrawingContext;
+class OpenGlShaderProgram;
+class TriMesh;
+
+class OpenGlMeshPainter
+{
+public:
+    OpenGlMeshPainter();
+
+    void paint(TriMesh* mesh, DrawingContext* context);
+
+private:
+    void initializeShader();
+    void initializeBuffers();
+
+    void paint(const std::vector<float>& verts, const std::vector<unsigned>& elements, const std::vector<float>& color);
+
+    unsigned mVertexBuffer{0};
+    unsigned mElementBuffer{0};
+    unsigned mVertexArray{0};
+    std::unique_ptr<OpenGlShaderProgram> mShaderProgram;
+};