Boxis R700 Manuel d'utilisateur Page 352

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ATI R700 Technology
10-38 Memory Read Instructions
Copyright © 2009 Advanced Micro Devices, Inc. All rights reserved.
10.5 Memory Read Instructions
The following are instructions to read from the following buffer types:
scratch
reduction
global
Texture Fetch Doubleword 2
Instructions
TEX_WORD2
Description This is the high-order (most-significant) doubleword in the 128-bit 4-tuple formed by
TEX_WORD[0,1,2] plus a doubleword filled with zeros, as described in Chapter 6.
Opcode Field Name Bits Format
OFFSET_X [4:0] int(5)
Value added to X element of texel address before sampling (in texel space).
S3.1 fixed-point value ranging from [-8, 8).
OFFSET_Y [9:5] int(5)
Value added to Y element of texel address before sampling (in texel space).
S3.1 fixed-point value ranging from [-8, 8).
OFFSET_Z [14:10] int(5)
Value added to Z element of texel address before sampling (in texel space).
S3.1 fixed-point value ranging from [-8, 8).
SAMPLER_ID [19:15] int(5)
Sampler ID to use (specifies filter options, etc.). Value in the range [0, 17].
SRC_SEL_X (SSX)
SRC_SEL_Y (SSY)
SRC_SEL_Z (SSZ)
SRC_SEL_W (SSW)
[22:20]
[25:23]
[28:26]
[31:29]
enum(3)
enum(3)
enum(3)
enum(3)
Specifies the element source for SRC.XYZW.
0 SEL_X: use X element.
1 SEL_Y: use Y element.
2 SEL_Z: use Z element.
3 SEL_W: use W element.
4 SEL_0: use constant 0.0.
5 SEL_1: use constant 1.0.
Related TEX_WORD0
TEX_WORD1
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