typedef enum D3D_PRIMITIVE
{
D3D_PRIMITIVE_UNDEFINED = 0,
D3D_PRIMITIVE_POINT = 1,
D3D_PRIMITIVE_LINE = 2,
D3D_PRIMITIVE_TRIANGLE = 3,
D3D_PRIMITIVE_LINE_ADJ = 6,
D3D_PRIMITIVE_TRIANGLE_ADJ = 7,
D3D_PRIMITIVE_1_CONTROL_POINT_PATCH = 8,
D3D_PRIMITIVE_2_CONTROL_POINT_PATCH = 9,
D3D_PRIMITIVE_3_CONTROL_POINT_PATCH = 10,
D3D_PRIMITIVE_4_CONTROL_POINT_PATCH = 11,
D3D_PRIMITIVE_5_CONTROL_POINT_PATCH = 12,
D3D_PRIMITIVE_6_CONTROL_POINT_PATCH = 13,
D3D_PRIMITIVE_7_CONTROL_POINT_PATCH = 14,
D3D_PRIMITIVE_8_CONTROL_POINT_PATCH = 15,
D3D_PRIMITIVE_9_CONTROL_POINT_PATCH = 16,
D3D_PRIMITIVE_10_CONTROL_POINT_PATCH = 17,
D3D_PRIMITIVE_11_CONTROL_POINT_PATCH = 18,
D3D_PRIMITIVE_12_CONTROL_POINT_PATCH = 19,
D3D_PRIMITIVE_13_CONTROL_POINT_PATCH = 20,
D3D_PRIMITIVE_14_CONTROL_POINT_PATCH = 21,
D3D_PRIMITIVE_15_CONTROL_POINT_PATCH = 22,
D3D_PRIMITIVE_16_CONTROL_POINT_PATCH = 23,
D3D_PRIMITIVE_17_CONTROL_POINT_PATCH = 24,
D3D_PRIMITIVE_18_CONTROL_POINT_PATCH = 25,
D3D_PRIMITIVE_19_CONTROL_POINT_PATCH = 26,
D3D_PRIMITIVE_20_CONTROL_POINT_PATCH = 27,
D3D_PRIMITIVE_21_CONTROL_POINT_PATCH = 28,
D3D_PRIMITIVE_22_CONTROL_POINT_PATCH = 29,
D3D_PRIMITIVE_23_CONTROL_POINT_PATCH = 30,
D3D_PRIMITIVE_24_CONTROL_POINT_PATCH = 31,
D3D_PRIMITIVE_25_CONTROL_POINT_PATCH = 32,
D3D_PRIMITIVE_26_CONTROL_POINT_PATCH = 33,
D3D_PRIMITIVE_27_CONTROL_POINT_PATCH = 34,
D3D_PRIMITIVE_28_CONTROL_POINT_PATCH = 35,
D3D_PRIMITIVE_29_CONTROL_POINT_PATCH = 36,
D3D_PRIMITIVE_30_CONTROL_POINT_PATCH = 37,
D3D_PRIMITIVE_31_CONTROL_POINT_PATCH = 38,
D3D_PRIMITIVE_32_CONTROL_POINT_PATCH = 39
} D3D_PRIMITIVE;
这个枚举包括了一系列的图元类型，如点、线、三角形，以及带有调整控制点的图元类型。这些图元类型用于描述在图形渲染中使用的基本几何形状。在使用顶点缓冲区进行渲染时，你可以指定要渲染的图元类型。
例如，在使用 DrawIndexed 函数进行绘制时，你需要指定图元类型，如下所示：
HRESULT DrawIndexed(
UINT IndexCountPerInstance,
UINT InstanceCount,
UINT StartIndexLocation,
INT BaseVertexLocation,
UINT StartInstanceLocation
);
在这个函数中，图元类型是通过设置顶点缓冲区和索引缓冲区来确定的，而不是直接通过函数参数传递。这里的图元类型与 D3D_PRIMITIVE 枚举中定义的图元类型相对应。
转载请注明出处：http://www.zyzy.cn/article/detail/26268/Win32 API/D3dcommon.h/D3D_PRIMITIVE