draw_mode.h

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/**
 
    @file      draw_mode.h
    @author    Khrapov
    @date      9.04.2021
    @copyright © Nick Khrapov, 2021. All right reserved.
 
**/
#pragma once
 
namespace qx
{
 
enum class draw_mode
{
    /*
        Separate points.
 
        { 0 }, { 1 }, { 2 }, { 3 }
    */
    points,
 
    /*
        Vertices 0 and 1 are considered a line.
        Vertices 2 and 3 are considered a line.
        And so on.
 
        { 0, 1 },
                  { 2, 3 },
    */
    lines_list,
 
    /*
        The adjacent vertices are considered lines.
 
        { 0, 1 },
           { 1, 2 },
              { 2, 3 }
    */
    lines_strip,
 
    /*
        Vertices 0, 1, and 2 form a triangle.
        Vertices 3, 4, and 5 form a triangle.
        And so on.
 
        { 0, 1, 2 },
                     { 3, 4, 5 },
                                  { 6, 7, 8 }
    */
    triangles_list,
 
    /*
        Every group of 3 adjacent vertices forms a triangle.
 
        { 0, 1, 3 },
           { 1, 2, 4 },
              { 2, 3, 5 }
    */
    triangles_strip,
 
    /*
        The first vertex is always held fixed.
        From there on, every group of 2 adjacent vertices
        form a triangle with the first.
 
        { 0, 1, 2 }
        { 0,    2, 3 }
        { 0,       3, 4 }
        { 0,           4, 5}
    */
    triangles_fan,
};
 
/**
    @brief  Returns true if the specified draw mode draws triangles
    @param  eDrawMode - draw mode to check
    @retval           - true if the specified draw mode draws triangles
**/
constexpr bool is_triandles(draw_mode eDrawMode)
{
    return eDrawMode == draw_mode::triangles_list || eDrawMode == draw_mode::triangles_strip
           || eDrawMode == draw_mode::triangles_fan;
}
 
} // namespace qx