D3DDECLUSAGE

Identifies the intended use of vertex data.

typedef enum D3DDECLUSAGE
{
    D3DDECLUSAGE_POSITION = 0,
    D3DDECLUSAGE_BLENDWEIGHT = 1,
    D3DDECLUSAGE_BLENDINDICES = 2,
    D3DDECLUSAGE_NORMAL = 3,
    D3DDECLUSAGE_PSIZE = 4,
    D3DDECLUSAGE_TEXCOORD = 5,
    D3DDECLUSAGE_TANGENT = 6,
    D3DDECLUSAGE_BINORMAL = 7,
    D3DDECLUSAGE_TESSFACTOR = 8,
    D3DDECLUSAGE_POSITIONT = 9,
    D3DDECLUSAGE_COLOR = 10,
    D3DDECLUSAGE_FOG = 11,
    D3DDECLUSAGE_DEPTH = 12,
    D3DDECLUSAGE_SAMPLE = 13,
} D3DDECLUSAGE, *LPD3DDECLUSAGE;

Constants

D3DDECLUSAGE_POSITION: Position data ranging from (-1,-1) to (1,1). Use D3DDECLUSAGE_POSITION with a usage index of 0 to specify untransformed position for fixed function vertex processing and the n-patch tessellator. Use D3DDECLUSAGE_POSITION with a usage index of 1 to specify untransformed position in the fixed function vertex shader for vertex tweening.
D3DDECLUSAGE_BLENDWEIGHT: Blending weight data. Use D3DDECLUSAGE_BLENDWEIGHT with a usage index of 0 to specify the blend weights used in indexed and nonindexed vertex blending.
D3DDECLUSAGE_BLENDINDICES: Blending indices data. Use D3DDECLUSAGE_BLENDINDICES with a usage index of 0 to specify matrix indices for indexed paletted skinning.
D3DDECLUSAGE_NORMAL: Vertex normal data. Use D3DDECLUSAGE_NORMAL with a usage index of 0 to specify vertex normals for fixed function vertex processing and the n-patch tessellator. Use D3DDECLUSAGE_NORMAL with a usage index of 1 to specify vertex normals for fixed function vertex processing for vertex tweening.
D3DDECLUSAGE_PSIZE: Point size data. Use D3DDECLUSAGE_PSIZE with a usage index of 0 to specify the point-size attribute used by the setup engine of the rasterizer to expand a point into a quad for the point-sprite functionality.
D3DDECLUSAGE_TEXCOORD: Texture coordinate data. Use D3DDECLUSAGE_TEXCOORD, n to specify texture coordinates in fixed function vertex processing and in pixel shaders prior to ps_3_0. These can be used to pass user defined data.
D3DDECLUSAGE_TANGENT: Vertex tangent data.
D3DDECLUSAGE_BINORMAL: Vertex binormal data.
D3DDECLUSAGE_TESSFACTOR: Single positive floating point value. Use D3DDECLUSAGE_TESSFACTOR with a usage index of 0 to specify a tessellation factor used in the tessellation unit to control the rate of tessellation. For more information about the data type, see D3DDECLTYPE_FLOAT1.
D3DDECLUSAGE_POSITIONT: Vertex data contains transformed position data ranging from (0,0) to (viewport width, viewport height). Use D3DDECLUSAGE_POSITIONT with a usage index of 0 to specify transformed position. When a declaration containing this is set, the pipeline does not perform vertex processing.
D3DDECLUSAGE_COLOR: Vertex data contains diffuse or specular color. Use D3DDECLUSAGE_COLOR with a usage index of 0 to specify the diffuse color in the fixed function vertex shader and pixel shaders prior to ps_3_0. Use D3DDECLUSAGE_COLOR with a usage index of 1 to specify the specular color in the fixed function vertex shader and pixel shaders prior to ps_3_0.
D3DDECLUSAGE_FOG: Vertex data contains fog data. Use D3DDECLUSAGE_FOG with a usage index of 0 to specify a fog blend value used after pixel shading finishes. This applies to pixel shaders prior to version ps_3_0.
D3DDECLUSAGE_DEPTH: Vertex data contains depth data.
D3DDECLUSAGE_SAMPLE: Vertex data contains sampler data. Use D3DDECLUSAGE_SAMPLE with a usage index of 0 to specify the displacement value to look up. It can be used only with D3DDECLUSAGE_LOOKUPPRESAMPLED or D3DDECLUSAGE_LOOKUP.

Remarks

Vertex data is declared with an array of D3DVERTEXELEMENT9 structures. Each element in the array contains a usage type.

For more information about vertex declarations, see Vertex Declaration.

D3DDECLUSAGE

Constants

Remarks

See Also