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vkd3d-shader/hlsl: Flatten conditional branches containing stores.

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For an if block

    if (cond)
    {
        <then_block>
    }
    else
    {
        <else_block>
    }

We flatten it by first replacing any store instruction `v[[k]] = x`
in the then_block with the following:

    1: load(v[[k]])
    2: cond ? x : @1
    3: v[[k]] = @2

Similarly, we replace any store instruction `v[[k]] = x` in the
else_block with the following:

    1: load(v[[k]])
    2: cond ? @1 : x
    3: v[[k]] = @2

Then we can concatenate <then_block> and <else_block> together and
get rid of the if block.
This commit is contained in:
Shaun Ren
2025-10-16 23:30:46 -04:00
committed by Henri Verbeet
parent 200e66ba4f
commit 4d5a1528ab
Notes: Henri Verbeet 2025-10-30 19:59:51 +01:00 
Approved-by: Francisco Casas (@fcasas)
Approved-by: Elizabeth Figura (@zfigura)
Approved-by: Henri Verbeet (@hverbeet)
Merge-Request: https://gitlab.winehq.org/wine/vkd3d/-/merge_requests/1732
10 changed files with 374 additions and 141 deletions
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20
tests/hlsl/conditional.shader_test
View File

@@ -1,4 +1,4 @@
[pixel shader todo(sm<4)]
[pixel shader]
uniform float4 u;
float4 main() : sv_target
@@ -11,13 +11,13 @@ float4 main() : sv_target
[test]
uniform 0 float4 0.0 0.0 0.0 0.0
todo(sm<4) draw quad
probe (0, 0) rgba (0.9, 0.8, 0.7, 0.6)
draw quad
probe (0, 0) f32(0.9, 0.8, 0.7, 0.6)
uniform 0 float4 0.1 0.0 0.0 0.0
todo(sm<4) draw quad
probe (0, 0) rgba (0.1, 0.2, 0.3, 0.4)
draw quad
probe (0, 0) f32(0.1, 0.2, 0.3, 0.4)
[pixel shader todo(sm<4)]
[pixel shader]
uniform float4 u;
float4 main() : sv_target
@@ -29,7 +29,7 @@ float4 main() : sv_target
return float4(0.9, 0.8, 0.7, 0.6);
}
[pixel shader todo(sm<4)]
[pixel shader]
uniform float4 u;
float4 main() : sv_target
@@ -43,8 +43,8 @@ float4 main() : sv_target
[test]
uniform 0 float4 0.0 0.0 0.0 0.0
todo(sm<4) draw quad
probe (0, 0) rgba (0.9, 0.8, 0.7, 0.6)
draw quad
probe (0, 0) f32(0.9, 0.8, 0.7, 0.6)
[pixel shader fail(sm<6)]
float4 u;
@@ -370,7 +370,7 @@ todo(msl & sm>=6) draw quad
probe (0, 0) rgba (1.0, 1.0, 0.0, 4.0)
% Branches with resource stores can't be flattened.
[pixel shader fail(sm<6) todo]
[pixel shader fail(sm<6)]
uniform float a;
RWBuffer<float> u;