basic ui panels

uilayer.h

@@ -0,0 +1,86 @@
+
+#pragma once
+
+#include <string>
+#include "texture.h"
+#include "float3d.h"
+
+// GuiLayer -- basic user interface class. draws requested information on top of openGL screen
+
+struct ui_panel {
+
+    struct text_line {
+
+        float4 color;
+        std::string data;
+
+        text_line( std::string const &Data, float4 const &Color):
+            data(Data), color(Color)
+        {}
+    };
+
+    ui_panel( const int X, const int Y):
+        origin_x(X), origin_y(Y)
+    {}
+
+    std::vector<text_line> text_lines;
+    float origin_x;
+    float origin_y;
+};
+
+class ui_layer {
+
+public:
+// parameters:
+
+// constructors:
+
+// destructor:
+    ~ui_layer();
+
+// methods:
+    bool
+        init( GLFWwindow *Window );
+	// draws requested UI elements
+	void
+        render();
+	// stores operation progress
+	void
+        set_progress( float const Progress = 0.0f, float const Subtaskprogress = 0.0f );
+	// sets the ui background texture, if any
+	void
+        set_background( std::string const &Filename = "" );
+    void
+        clear_texts() { m_panels.clear(); }
+    void
+        push_back( std::shared_ptr<ui_panel> Panel ) { m_panels.emplace_back( Panel ); }
+
+// members:
+
+private:
+// methods:
+    // draws background quad with specified earlier texture
+    void
+        render_background();
+    // draws a progress bar in defined earlier state
+    void
+        render_progress();
+    void
+        render_panels();
+    // prints specified text, using display lists font
+    void
+        print( std::string const &Text );
+    // draws a quad between coordinates x,y and z,w with uv-coordinates spanning 0-1
+    void
+        quad( float4 const &Coordinates, float4 const &Color );
+
+
+// members:
+    GLuint m_fontbase{ -1 }; // numer DL dla znaków w napisach
+    float m_progress{ 0.0f };                // percentage of filled progres bar, to indicate lengthy operations.
+    float m_subtaskprogress{ 0.0f };                // percentage of filled progres bar, to indicate lengthy operations.
+    texture_manager::size_type m_background; // path to texture used as the background. size depends on mAspect.
+    std::vector<std::shared_ptr<ui_panel> > m_panels;
+};
+
+extern ui_layer UILayer;