Added class GCodeViewer -> basic render of gcode toolpaths using dedicated shaders

src/slic3r/GUI/GCodeViewer.hpp

@@ -0,0 +1,63 @@
+#ifndef slic3r_GCodeViewer_hpp_
+#define slic3r_GCodeViewer_hpp_
+
+#if ENABLE_GCODE_VIEWER
+
+#include "GLShader.hpp"
+#include "libslic3r/GCode/GCodeProcessor.hpp"
+
+#include <vector>
+
+namespace Slic3r {
+namespace GUI {
+
+class GCodeViewer
+{
+    struct Buffer
+    {
+        unsigned int vbo_id{ 0 };
+        std::vector<float> data;
+
+        static size_t stride(GCodeProcessor::EMoveType type)
+        {
+            return 3 * sizeof(float);
+        }
+
+        static size_t record_size(GCodeProcessor::EMoveType type)
+        {
+            switch (type)
+            {
+            case GCodeProcessor::EMoveType::Tool_change:
+            case GCodeProcessor::EMoveType::Retract:
+            case GCodeProcessor::EMoveType::Unretract: { return 3; }
+            case GCodeProcessor::EMoveType::Extrude:
+            case GCodeProcessor::EMoveType::Travel: { return 6; }
+            default: { return 0; }
+            }
+        }
+    };
+
+    std::vector<Buffer> m_buffers{ static_cast<size_t>(GCodeProcessor::EMoveType::Extrude) };
+    std::vector<Shader> m_shaders{ static_cast<size_t>(GCodeProcessor::EMoveType::Extrude) };
+    unsigned int m_last_result_id{ 0 };
+
+public:
+    GCodeViewer() = default;
+    ~GCodeViewer() { reset_buffers(); }
+
+    bool init() { return init_shaders(); }
+    void generate(const GCodeProcessor::Result& gcode_result);
+    void render() const;
+
+private:
+    bool init_shaders();
+    void reset_buffers();
+};
+
+} // namespace GUI
+} // namespace Slic3r
+
+#endif // ENABLE_GCODE_VIEWER
+
+#endif // slic3r_GCodeViewer_hpp_
+