Input Texture Coordinate Register

Pixel shader input register containing texture coordinates.

Syntax

Input Texture Coordinate Register 

Remarks

Remarks

Pixel shader versions	1_1	1_2	1_3	1_4	2_0	2_sw	2_x	3_0	3_sw
Texture Coordinate Register					x	x	x	x	x

A texture coordinate register contains texture coordinate data. Before a texture coordinate register is used, it must be declared by a pixel shader declaration. For details about how to declare a texture register, see dcl.

In addition, here are some other properties of texture coordinate registers.

• There are eight pixel-shader texture coordinate registers, t0 to t7.
• These are read-only registers.
• They contain four-component RGBA values iterated from input vertices.
• They contain high precision, high dynamic range data values interpolated from the vertex data. Values are generated with perspective-correct interpolation. Data is floating-point precision, and is signed.
• There is a maximum of one in a single instruction.
• Multiple reads of a texture coordinate register within a shader must use identical source selectors. See Source Register Selectors.
• The optional partial precision modifier [_pp] applies to dependent reads. This is because partial precision affects arithmetic operations involving the texture coordinate register. It will not affect the precision of texture address instructions because it does not affect the texture coordinate iterators.

Minimum operating system	Windows 98

Instruction Information

Minimum operating systems	Windows 98