James Price a89ff5981b tint: Show where control flow became non-uniform
Add additional nodes to capture places where control flow is changed
(if, switch, for, short-circuiting op, function call), and use these
to show the actual point at which control flow became non-uniform as a
result of a non-uniform value.

Do this recursively, to capture cases where control flow becomes
non-uniform after a function call statement.

Bug: tint:880
Change-Id: Ied92d690f98a5c11a1892eef500a50d0f123943d
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/89862
Kokoro: Kokoro <noreply+kokoro@google.com>
Reviewed-by: Ben Clayton <bclayton@google.com>
2022-05-16 11:53:25 +00:00

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bug/fxc/gradient_in_varying_loop/1112.wgsl:23:33 warning: 'textureSample' must only be called from uniform control flow
let sampleDepth : f32 = textureSample(depthTexture, Sampler, offset.xy).r;
^^^^^^^^^^^^^
bug/fxc/gradient_in_varying_loop/1112.wgsl:18:28 note: control flow depends on non-uniform value
if (offset.x < 0.0 || offset.y < 0.0 || offset.x > 1.0 || offset.y > 1.0) {
^^
bug/fxc/gradient_in_varying_loop/1112.wgsl:8:29 note: return value of 'textureSample' may be non-uniform
let random: vec3<f32> = textureSample(randomTexture, Sampler, vUV).rgb;
^^^^^^^^^^^^^
#include <metal_stdlib>
using namespace metal;
struct tint_symbol_2 {
float2 vUV [[user(locn0)]];
};
struct tint_symbol_3 {
float4 value [[color(0)]];
};
float4 tint_symbol_inner(float2 vUV, texture2d<float, access::sample> tint_symbol_4, sampler tint_symbol_5, texture2d<float, access::sample> tint_symbol_6) {
float3 const random = float4(tint_symbol_4.sample(tint_symbol_5, vUV)).rgb;
int i = 0;
while (true) {
if ((i < 1)) {
} else {
break;
}
float3 const offset = float3(random[0]);
if (((((offset[0] < 0.0f) || (offset[1] < 0.0f)) || (offset[0] > 1.0f)) || (offset[1] > 1.0f))) {
i = as_type<int>((as_type<uint>(i) + as_type<uint>(1)));
continue;
}
float const sampleDepth = tint_symbol_6.sample(tint_symbol_5, float3(offset).xy)[0];
i = as_type<int>((as_type<uint>(i) + as_type<uint>(1)));
}
return float4(1.0f);
}
fragment tint_symbol_3 tint_symbol(texture2d<float, access::sample> tint_symbol_7 [[texture(0)]], sampler tint_symbol_8 [[sampler(0)]], texture2d<float, access::sample> tint_symbol_9 [[texture(1)]], tint_symbol_2 tint_symbol_1 [[stage_in]]) {
float4 const inner_result = tint_symbol_inner(tint_symbol_1.vUV, tint_symbol_7, tint_symbol_8, tint_symbol_9);
tint_symbol_3 wrapper_result = {};
wrapper_result.value = inner_result;
return wrapper_result;
}