Although the system generally allows texture coordinates outside the range of 0.0 and 1.0, inclusive, hardware limitations often affect how far outside that range texture coordinates can be. A rendering device communicates this limit in the dwMaxTextureRepeat member of the D3DDEVICEDESC7 structure when you retrieve device capabilities. The value in this member describes the full range of texture coordinates allowed by the device. For instance, if this value is 128, then the input texture coordinates must be kept in the range -128.0 to +128.0. Passing vertices with texture coordinates outside of this range is invalid. The same restriction applies to the texture coordinates generated as a result of automatic texture coordinate generation and texture coordinate transformations.

The interpretation of dwMaxTextureRepeat is also affected by the D3DPTEXTURECAPS_TEXREPEATNOTSCALEDBYSIZE capability bit. When this bit is set, the value in the dwMaxTextureRepeat member of D3DDEVICEDESC7 is used precisely as described. However, when D3DPTEXTURECAPS_TEXREPEATNOTSCALEDBYSIZE is not set, texture repeating limitations depend on the size of the texture indexed by the texture coordinates. In this case, dwMaxTextureRepeat must be scaled by the current texture size (at the largest level of detail) to compute the valid texture coordinate range. For example, given a texture dimension of 32 and dwMaxTextureRepeat value of 512, the actual valid texture coordinate range is 512/32 = 16, so the texture coordinates for this device must be within the range of -16.0 to +16.0.

Although the system generally allows texture coordinates outside the range of 0.0 and 1.0, inclusive, hardware limitations often affect how far outside that range texture coordinates can be. A rendering device communicates this limit in the lMaxTextureRepeat member of the D3DDEVICEDESC7 type when you retrieve device capabilities. The value in this member describes the full range of texture coordinates allowed by the device. For instance, if this value is 128, then the input texture coordinates must be kept in the range -128.0 to +128.0. Passing vertices with texture coordinates outside of this range is invalid. The same restriction applies to the texture coordinates generated as a result of automatic texture coordinate generation and texture coordinate transformations.

The interpretation of lMaxTextureRepeat is also affected by the D3DPTEXTURECAPS_TEXREPEATNOTSCALEDBYSIZE capability bit. When this bit is set, the value in the lMaxTextureRepeat member of D3DDEVICEDESC7 is used precisely as described. However, when D3DPTEXTURECAPS_TEXREPEATNOTSCALEDBYSIZE is not set, texture repeating limitations depend on the size of the texture indexed by the texture coordinates. In this case, lMaxTextureRepeat must be scaled by the current texture size (at the largest level of detail) to compute the valid texture coordinate range. For example, given a texture dimension of 32 and lMaxTextureRepeat value of 512, the actual valid texture coordinate range is 512/32 = 16, so the texture coordinates for this device must be within the range of -16.0 to +16.0.