add initial examples, replacing the 'Demos/Demos3'. Will make it work cross-platform, OpenGL3/OpenGL2 and add more examples to it.

examples/CommonInterfaces/CommonGraphicsAppInterface.h

@@ -0,0 +1,54 @@
+#ifndef COMMON_GRAPHICS_APP_H
+#define COMMON_GRAPHICS_APP_H
+
+struct DrawGridData
+{
+    int gridSize;
+    float upOffset;
+    int upAxis;
+    float gridColor[4];
+
+    DrawGridData()
+    :gridSize(10),
+    upOffset(0.001f),
+    upAxis(1)
+    {
+        gridColor[0] = 0.6f;
+        gridColor[1] = 0.6f;
+        gridColor[2] = 0.6f;
+        gridColor[3] = 1.f;
+    }
+};
+
+struct CommonGraphicsApp
+{
+	CommonGraphicsApp()
+		:m_window(0),
+		m_renderer(0),
+		m_parameterInterface(0),
+		m_2dCanvasInterface(0)
+	{
+	}
+	virtual ~CommonGraphicsApp()
+	{
+	}
+	
+	class b3gWindowInterface*	m_window;
+	struct CommonRenderInterface*	m_renderer;
+	struct CommonParameterInterface*	m_parameterInterface;
+	struct Common2dCanvasInterface*	m_2dCanvasInterface;
+
+	virtual void drawGrid(DrawGridData data=DrawGridData()) = 0;
+	virtual void setUpAxis(int axis) = 0;
+	virtual int getUpAxis() const = 0;
+	
+	virtual void swapBuffer() = 0;
+	virtual void drawText( const char* txt, int posX, int posY) = 0;
+	virtual void drawText3D( const char* txt, float posX, float posZY, float posZ, float size)=0;
+	virtual int	registerCubeShape(float halfExtentsX,float halfExtentsY, float halfExtentsZ)=0;
+	virtual int	registerGraphicsSphereShape(float radius, bool usePointSprites=true, int largeSphereThreshold=100, int mediumSphereThreshold=10)=0;
+	virtual void registerGrid(int xres, int yres, float color0[4], float color1[4])=0;
+};
+
+
+#endif //COMMON_GRAPHICS_APP_H