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

54 lines
1.1 KiB
HLSL

cbuffer cbuffer_x_8 : register(b0, space0) {
uint4 x_8[1];
};
static float4 x_GLF_color = float4(0.0f, 0.0f, 0.0f, 0.0f);
void main_1() {
int a[3] = (int[3])0;
int b = 0;
int c = 0;
a[0] = 1;
a[1] = 2;
a[2] = 3;
b = 0;
const int x_38 = asint(x_8[0].x);
const int x_40 = a[x_38];
c = x_40;
if ((c > 1)) {
x_GLF_color = float4(0.0f, 1.0f, 1.0f, 0.0f);
b = (b + 1);
}
const int x_48 = (b + 1);
b = x_48;
const int x_50_save = clamp(x_48, 0, 2);
const int x_51 = a[x_50_save];
a[x_50_save] = (x_51 + 1);
const int x_54 = a[2];
if ((x_54 == 4)) {
x_GLF_color = float4(1.0f, 0.0f, 0.0f, 1.0f);
} else {
x_GLF_color = float4(0.0f, 0.0f, 0.0f, 0.0f);
}
return;
}
struct main_out {
float4 x_GLF_color_1;
};
struct tint_symbol {
float4 x_GLF_color_1 : SV_Target0;
};
main_out main_inner() {
main_1();
const main_out tint_symbol_2 = {x_GLF_color};
return tint_symbol_2;
}
tint_symbol main() {
const main_out inner_result = main_inner();
tint_symbol wrapper_result = (tint_symbol)0;
wrapper_result.x_GLF_color_1 = inner_result.x_GLF_color_1;
return wrapper_result;
}