| Version | Maximum number of instructions |
| 1_x | 8 for version 1_1. 12 for version 1_2 and 1_3. 14 for version 1_4. |
| 2_0 | 64 arithmetic and 32 texture instructions. |
| 2_0 Extended | 96 minimum, up to 512 maximum. The exact number is specified by D3DCAPS9.PS20Caps.MaxPixelShaderInstructionSlots. |
| 3_0 | 512 minimum, up to the number of slots in the D3DCAPS9.MaxPixelShader30InstructionSlots( not more than 32768 ) |
Version 1_x
New instructions :
- Setup instructions : def, ps
- Arithmetic instructions : add, cmp, cnd, dp3, dp4, lrp, mad, mov, mul, nop, sub
- Macros : exp, frc, log, m3x2, m3x3, m4x3, m4x4
- Texture instructions : tex, texbem, texbeml, texcoord, texcrd, texdepth, texdp3, texdp3tex, texkill, texId, texm3x2depth, texm3x2pad, texm3x2tex, texm3x3, texm3x3pad, texm3x3tex, texm3x3spec, texm3x3vspec, texreg2ar, texreg2gb, texreg2rgb
New registers : constant, temporary, texture, color
New modifiers : instruction modifiers, register modifiers, source register selectors, register write masks
Version 2_0
New instructions :
- Setup instructions : def, ps
- Arithmetic instructions : add, cmp, cnd, dp3, dp4, lrp, mad, mov, mul, nop, sub
- Macros : exp, frc, log, m3x2, m3x3, m3x4, m4x3, m4x4
- Texture instructions :
- Added : texldb, texldp
- Removed : tex, texbem, texbeml, texcoord, texcrd, texdepth, texdp3, texdp3tex, texm3x2depth, texm3x2pad, texm3x2tex, texm3x3, texm3x3pad, texm3x3tex, texm3x3spec, texm3x3vspec, texreg2ar, texreg2gb, texreg2rgb
New registers : constant float, sampler, output color, output depth
New modifiers : negate, partial precision, saturate
Removed co-issuing of instructions
Version 2_0 Extended
- New static flow control instructions ( with a cap set ) : call, callnz, else, end, endif, endloop, endrep, if, label, loop, rep, ret
- Static flow constrol nesting depth
- Number of temporary registers
- Dynamic flow control instructions : break, breakc, ifc
- Gradient instructions : dsx and dsy
- Texture instructions : texldd
- Predication : setp instruction, p# register
New registers : constant integer, constant Boolean, loop counter, predicate
New modifiers( with a cap set ) : arbitrary swizzle
Version 3_0
- Static flow control instruction : call, callnz, else, end, endif, endloop, endrep, if, label, loop, rep, ret
- Static flow control nesting depth
- Number of temporary registers
- Dynamic flow control instructions : break, breakc, ifc
- Predication : setp instruction, p# register
New registers : constant integer, constant Boolean, loop counter, predicate
New modifiers : arbitrary swizzle
출처 : MSDN
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