Renders a sequence of nonindexed, geometric primitives of the specified type from the current set of data input streams.
HRESULT DrawPrimitive( [in] D3DPRIMITIVETYPE PrimitiveType, [in] UINT StartVertex, [in] UINT PrimitiveCount );
- PrimitiveType [in]
Member of the D3DPRIMITIVETYPE enumerated type, describing the type of primitive to render.
- StartVertex [in]
Index of the first vertex to load. Beginning at StartVertex the correct number of vertices will be read out of the vertex buffer.
- PrimitiveCount [in]
Number of primitives to render. The maximum number of primitives allowed is determined by checking the MaxPrimitiveCount member of the D3DCAPS9 structure. PrimitiveCount is the number of primitives as determined by the primitive type. If it is a line list, each primitive has two vertices. If it is a triangle list, each primitive has three vertices.
If the method succeeds, the return value is D3D_OK. If the method fails, the return value can be D3DERR_INVALIDCALL.
When converting a legacy application to Direct3D 9, you must add a call to either IDirect3DDevice9::SetFVF to use the fixed function pipeline, or IDirect3DDevice9::SetVertexDeclaration to use a vertex shader before you make any Draw calls.
- Rendering from Vertex and Index Buffers (Direct3D 9)