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SVGA3D only supports SGN for vertex shaders, and this requires two additional
temporary registers for intermediate results.
For fragment shaders, lower to two CMPs and one ADD.
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Count int and float constants independently. Since there are only
few i# constants available and hundreds of c# constants, it would
be too easy to end up with an i# declaration out of its range.
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Pixel shaders do not have address registers a#, only one
loop register aL. Our only hope is to assume the address
register is in fact a loop counter and replace it with aL.
Do not translate ARL instruction for pixel shaders -- MOVA
instruction is only valid for vertex saders.
Make it more explicit relative addressing of inputs is only valid
for pixel shaders and constants for vertex shaders.
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SVGA3DOP_CMP is not supported for vertex shaders;
use SLT + LRP instead.
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Use front/back instead of cw/ccw throughout.
Also, use offset_point/line/fill instead of offset_cw/ccw.
Brings gallium representation of this state into line with its main
user, and also what turns out to be the most common hardware
representation.
This fixes a long-standing bias in the interface towards the
architecture of the software rasterizer.
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Small improvement in Lightsmark 2008.
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This fixes a regression with Lightsmark, where more compact TGSI from Mesa
was causing a zero mask MOV to be emitted for shadow map compare, causing
problems in some backends.
Add a few more assertions to catch cases like this.
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Texture derivatives are potentially undefined inside dynamic branches,
so hardwire lod zero in this case. Treating all if/endif and loop
constructs as dynamic branches.
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This is to differentiate it from its unsigned version, TGSI_OPCODE_USHR.
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SrcRegister -> Register
SrcRegisterInd -> Indirect
SrcRegisterDim -> Dimension
SrcRegisterDimInd -> DimIndirect
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DstRegister -> Register
DstRegisterInd -> Indirect
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InstructionPredicate -> Predicate
InstructionLabel -> Label
InstructionTexture -> Texture
FullSrcRegisters -> Src
FullDstRegisters -> Dst
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Drop anonymous 'Extended' fields, have every optional token named
explicitly in its parent. Eg. there is now an Instruction.Label flag,
etc.
Drop destination modifiers and other functionality which cannot be
generated by tgsi_ureg.c, which is now the primary way of creating
shaders.
Pull source modifiers into the source register token, drop the second
negate flag. The source register token is now full - if we need to
expand it, probably best to move all of the modifiers to a new token
and have a single flag for it.
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