James Price a5d73ce965 transform/shader_io: Generate a wrapper function
This is a major reworking of this transform. The old transform code
was getting unwieldy, with part of the complication coming from the
handling of multiple return statements. By generating a wrapper
function instead, we can avoid a lot of this complexity.

The original entry point function is stripped of all shader IO
attributes (as well as `stage` and `workgroup_size`), but the body is
left unmodified. A new entry point wrapper function is introduced
which calls the original function, packing/unpacking the shader inputs
as necessary, and propagates the result to the corresponding shader
outputs.

The new code has been refactored to use a state object with the
different parts of the transform split into separate functions, which
makes it much more manageable.

Fixed: tint:1076
Bug: tint:920
Change-Id: I3490a0ea7a3509a4e198ce730e476516649d8d96
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/60521
Auto-Submit: James Price <jrprice@google.com>
Kokoro: Kokoro <noreply+kokoro@google.com>
Commit-Queue: James Price <jrprice@google.com>
Reviewed-by: Ben Clayton <bclayton@google.com>
2021-08-04 22:15:28 +00:00

81 lines
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#include <metal_stdlib>
using namespace metal;
struct main_out {
float4 x_GLF_color_1;
};
struct tint_symbol_1 {
float4 x_GLF_color_1 [[color(0)]];
};
void x_47() {
discard_fragment();
}
void main_1(thread float4* const tint_symbol_3, thread float4* const tint_symbol_4) {
while (true) {
int x_30_phi = 0;
bool x_48_phi = false;
x_30_phi = 0;
while (true) {
int x_31 = 0;
int const x_30 = x_30_phi;
x_48_phi = false;
if ((x_30 < 10)) {
} else {
break;
}
float const x_37 = (*(tint_symbol_3)).y;
if ((x_37 < 0.0f)) {
float const x_42 = (*(tint_symbol_3)).x;
if ((x_42 < 0.0f)) {
x_48_phi = false;
break;
} else {
{
x_31 = as_type<int>((as_type<uint>(x_30) + as_type<uint>(1)));
x_30_phi = x_31;
}
continue;
}
{
x_31 = as_type<int>((as_type<uint>(x_30) + as_type<uint>(1)));
x_30_phi = x_31;
}
continue;
}
x_47();
x_48_phi = true;
break;
{
x_31 = as_type<int>((as_type<uint>(x_30) + as_type<uint>(1)));
x_30_phi = x_31;
}
}
bool const x_48 = x_48_phi;
if (x_48) {
break;
}
*(tint_symbol_4) = float4(1.0f, 0.0f, 0.0f, 1.0f);
break;
}
return;
}
main_out tint_symbol_inner(float4 gl_FragCoord_param, thread float4* const tint_symbol_5, thread float4* const tint_symbol_6) {
*(tint_symbol_5) = gl_FragCoord_param;
main_1(tint_symbol_5, tint_symbol_6);
main_out const tint_symbol_2 = {.x_GLF_color_1=*(tint_symbol_6)};
return tint_symbol_2;
}
fragment tint_symbol_1 tint_symbol(float4 gl_FragCoord_param [[position]]) {
thread float4 tint_symbol_7 = 0.0f;
thread float4 tint_symbol_8 = 0.0f;
main_out const inner_result = tint_symbol_inner(gl_FragCoord_param, &(tint_symbol_7), &(tint_symbol_8));
tint_symbol_1 wrapper_result = {};
wrapper_result.x_GLF_color_1 = inner_result.x_GLF_color_1;
return wrapper_result;
}