Boxis R700 User Manual Page 294

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ATI R700 Technology
9-196 Texture-Fetch Instructions
Copyright © 2009 Advanced Micro Devices, Inc. All rights reserved.
Sample Texture with Comparison, Gradient, and LOD Bias
Instructions
SAMPLE_C_G_LB
Description This instruction behaves exactly like the SAMPLE_C_G instruction, except that a constant bias
value, placed in the instruction’s LOD_BIAS field by the compiler, is added to the computed
LOD for the source address.
Microcode
Format TEX_DWORD0 (page 10-35), TEX_DWORD1 (page 10-37), and TEX_DWORD2 (page 10-38).
Instruction Field TEX_INST == TEX_INST_SAMPLE_C_G_LB, opcode 30 (0x1E).
00000000000000000000000000000000+12
SSW SSZ SSY SSX SAMPLER_ID OFFSET_Z OFFSET_Y OFFSET_X +8
C
T
W
C
T
Z
C
T
Y
C
T
X
LOD_BIAS DSW DSZ DSY DSX
D
R
DST_GPR +4
Reserved
S
R
SRC_GPR RESOURCE_ID
F
W
Q
B
F
M
TEX_INST +0
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