## renderingMode

renderingMode — Controls the way OpenGL renders objects.

## Synopsis

    enum        RenderingModeId;
    void        openGLInit_renderingMode        ();
    gboolean    openGLSet_globalRenderingMode   (RenderingModeId value);
    RenderingModeId openGLGet_globalRenderingOption
                                                ();
    void        openGLApply_renderingMode       (RenderingModeId mode);

## Description

This modules creates an interface to access to the way OpenGL renders the objects (`glPolygonMode()` and `glShadeModel()` functions). There are then three rendering modes available in V_Sim: wireframe, flat and smooth. They are controls by an enum RenderingModeId. When `openGLApply_renderingMode()` is called, the current rendering mode is changed for all future drawing calls that uses polygons.

## Details

### enum RenderingModeId

    typedef enum
      {
        Wireframe,
        Flat,
        Smooth,
    /*     SmoothAndEdge, */
        nb_renderingModes
      } RenderingModeId;

Implemented mode to draw objects.

`Wireframe` | objects are rendered with lines only ;
`Flat` | objects are rendered with polygons whose colours are uniform on each polygon ;
`Smooth` | objects are rendered with polygons whose colours are shaded to be smooth all along the object.
`nb_renderingModes` | number of rendering mode.

### openGLInit_renderingMode ()

    void        openGLInit_renderingMode        ();

This method is used by opengl.c to initialise this module (declare config file options...). It should not be called elsewhere.

### openGLSet_globalRenderingMode ()

    gboolean    openGLSet_globalRenderingMode   (RenderingModeId value);

This function change the value of the parameter renderingOption. It controls how V_Sim renders objects, in wireframe for example.

`value` : | an integer to represent the method of rendering.
Returns : | TRUE if the signal OpenGLAskForReDraw should be emitted.

### openGLGet_globalRenderingOption ()

    RenderingModeId openGLGet_globalRenderingOption
                                                ();

This function retrieve the value of the parameter renderingOption.

Returns : | the identifier of the current rendering option.

### openGLApply_renderingMode ()

    void        openGLApply_renderingMode       (RenderingModeId mode);

Change the rendering mode of current OpenGL context.

`mode` : | an integer.