writer/wgsl: Implement interpolate attributes
Add E2E tests to cover all of the parameter combinations.
Mark the attribute as unimplemented in the other backends.
Bug: tint:746
Change-Id: I86881ff0b224fe93670db42473341ae185eeabdd
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/56244
Kokoro: Kokoro <noreply+kokoro@google.com>
Auto-Submit: James Price <jrprice@google.com>
Reviewed-by: Ben Clayton <bclayton@google.com>
diff --git a/test/shader_io/interpolate_input_struct.wgsl b/test/shader_io/interpolate_input_struct.wgsl
new file mode 100644
index 0000000..0299250
--- /dev/null
+++ b/test/shader_io/interpolate_input_struct.wgsl
@@ -0,0 +1,14 @@
+struct In {
+ [[location(0)]] none : f32;
+ [[location(1), interpolate(flat)]] flat : f32;
+ [[location(2), interpolate(perspective, center)]] perspective_center : f32;
+ [[location(3), interpolate(perspective, centroid)]] perspective_centroid : f32;
+ [[location(4), interpolate(perspective, sample)]] perspective_sample : f32;
+ [[location(5), interpolate(linear, center)]] linear_center : f32;
+ [[location(6), interpolate(linear, centroid)]] linear_centroid : f32;
+ [[location(7), interpolate(linear, sample)]] linear_sample : f32;
+};
+
+[[stage(fragment)]]
+fn main(in : In) {
+}
