ID2D1DrawInfo::SetVertexProcessing method

Sets a vertex buffer, a corresponding vertex shader, and options to control how the vertices are to be handled by the Direct2D context.

Syntax

HRESULT SetVertexProcessing(
  [in, optional]       ID2D1VertexBuffer      *vertexBuffer,
                       D2D1_VERTEX_OPTIONS    vertexOptions,
  [in, optional] const D2D1_BLEND_DESCRIPTION *blendDescription = NULL,
  [in, optional] const D2D1_VERTEX_RANGE      *vertexRange = NULL,
                       GUID                   *vertexShader
);

Parameters

vertexBuffer [in, optional]

Type: ID2D1VertexBuffer*

The vertex buffer, if this is cleared, the default vertex shader and mapping to the transform rectangles will be used.

vertexOptions

Type: D2D1_VERTEX_OPTIONS

Options that influence how the renderer will interact with the vertex shader.

blendDescription [in, optional]

Type: const D2D1_BLEND_DESCRIPTION*

How the vertices will be blended with the output texture.

vertexRange [in, optional]

Type: const D2D1_VERTEX_RANGE*

The set of vertices to use from the buffer.

vertexShader

Type: GUID*

The GUID of the vertex shader.

Return value

Type: HRESULT

If the method succeeds, it returns S_OK. If it fails, it returns an HRESULT error code.

Remarks

The vertex shaders associated with the vertex buffer through the vertex shader GUID must have been loaded through the ID2D1EffectContext::LoadVertexShader method before this call is made.

If you pass the vertex option D2D1_VERTEX_OPTIONS_DO_NOT_CLEAR, then the method fails unless the blend description is exactly this:

D2D1_BLEND_DESCRIPTION blendDesc = 
        {
            D2D1_BLEND_ONE,
            D2D1_BLEND_ZERO,
            D2D1_BLEND_OPERATION_ADD,

            D2D1_BLEND_ONE,
            D2D1_BLEND_ZERO,
            D2D1_BLEND_OPERATION_ADD,

            { 1.0f, 1.0f, 1.0f, 1.0f }
        };

If this call fails, the corresponding ID2D1Effect instance is placed into an error state and fails to draw.

If blendDescription is NULL, a foreground-over blend mode is used.

Requirements

See also

ID2D1DrawInfo

ID2D1EffectContext::CreateVertexBuffer

ID2D1EffectContext::LoadVertexShader