[naga/wgsl-out]: add tests for polyfilled inverse

naga/tests/in/glsl/inverse-polyfill.frag

@@ -0,0 +1,17 @@
+#version 450
+
+void main() {
+    vec4 a4 = vec4(1.0);
+    vec4 b4 = vec4(2.0);
+    mat4 m4 = mat4(a4, b4, a4, b4);
+
+    vec3 a3 = vec3(1.0);
+    vec3 b3 = vec3(2.0);
+    mat3 m3 = mat3(a3, b3, a3);
+
+    mat2 m2 = mat2(1.0, 2.0, 3.0, 4.0);
+
+    mat4 m4_inverse = inverse(m4);
+    mat3 m3_inverse = inverse(m3);
+    mat2 m2_inverse = inverse(m2);
+}

naga/tests/out/wgsl/inverse-polyfill.frag.wgsl

@@ -0,0 +1,110 @@
+fn main_1() {
+    var a4_: vec4<f32> = vec4(1f);
+    var b4_: vec4<f32> = vec4(2f);
+    var m4_: mat4x4<f32>;
+    var a3_: vec3<f32> = vec3(1f);
+    var b3_: vec3<f32> = vec3(2f);
+    var m3_: mat3x3<f32>;
+    var m2_: mat2x2<f32> = mat2x2<f32>(vec2<f32>(1f, 2f), vec2<f32>(3f, 4f));
+    var m4_inverse: mat4x4<f32>;
+    var m3_inverse: mat3x3<f32>;
+    var m2_inverse: mat2x2<f32>;
+
+    let _e6 = a4_;
+    let _e7 = b4_;
+    let _e8 = a4_;
+    let _e9 = b4_;
+    m4_ = mat4x4<f32>(vec4<f32>(_e6.x, _e6.y, _e6.z, _e6.w), vec4<f32>(_e7.x, _e7.y, _e7.z, _e7.w), vec4<f32>(_e8.x, _e8.y, _e8.z, _e8.w), vec4<f32>(_e9.x, _e9.y, _e9.z, _e9.w));
+    let _e38 = a3_;
+    let _e39 = b3_;
+    let _e40 = a3_;
+    m3_ = mat3x3<f32>(vec3<f32>(_e38.x, _e38.y, _e38.z), vec3<f32>(_e39.x, _e39.y, _e39.z), vec3<f32>(_e40.x, _e40.y, _e40.z));
+    let _e64 = m4_;
+    m4_inverse = _naga_inverse_4x4_f32(_e64);
+    let _e68 = m3_;
+    m3_inverse = _naga_inverse_3x3_f32(_e68);
+    let _e72 = m2_;
+    m2_inverse = _naga_inverse_2x2_f32(_e72);
+    return;
+}
+
+@fragment 
+fn main() {
+    main_1();
+    return;
+}
+
+fn _naga_inverse_4x4_f32(m: mat4x4<f32>) -> mat4x4<f32> {
+   let sub_factor00: f32 = m[2][2] * m[3][3] - m[3][2] * m[2][3];
+   let sub_factor01: f32 = m[2][1] * m[3][3] - m[3][1] * m[2][3];
+   let sub_factor02: f32 = m[2][1] * m[3][2] - m[3][1] * m[2][2];
+   let sub_factor03: f32 = m[2][0] * m[3][3] - m[3][0] * m[2][3];
+   let sub_factor04: f32 = m[2][0] * m[3][2] - m[3][0] * m[2][2];
+   let sub_factor05: f32 = m[2][0] * m[3][1] - m[3][0] * m[2][1];
+   let sub_factor06: f32 = m[1][2] * m[3][3] - m[3][2] * m[1][3];
+   let sub_factor07: f32 = m[1][1] * m[3][3] - m[3][1] * m[1][3];
+   let sub_factor08: f32 = m[1][1] * m[3][2] - m[3][1] * m[1][2];
+   let sub_factor09: f32 = m[1][0] * m[3][3] - m[3][0] * m[1][3];
+   let sub_factor10: f32 = m[1][0] * m[3][2] - m[3][0] * m[1][2];
+   let sub_factor11: f32 = m[1][1] * m[3][3] - m[3][1] * m[1][3];
+   let sub_factor12: f32 = m[1][0] * m[3][1] - m[3][0] * m[1][1];
+   let sub_factor13: f32 = m[1][2] * m[2][3] - m[2][2] * m[1][3];
+   let sub_factor14: f32 = m[1][1] * m[2][3] - m[2][1] * m[1][3];
+   let sub_factor15: f32 = m[1][1] * m[2][2] - m[2][1] * m[1][2];
+   let sub_factor16: f32 = m[1][0] * m[2][3] - m[2][0] * m[1][3];
+   let sub_factor17: f32 = m[1][0] * m[2][2] - m[2][0] * m[1][2];
+   let sub_factor18: f32 = m[1][0] * m[2][1] - m[2][0] * m[1][1];
+
+   var adj: mat4x4<f32>;
+   adj[0][0] =   (m[1][1] * sub_factor00 - m[1][2] * sub_factor01 + m[1][3] * sub_factor02);
+   adj[1][0] = - (m[1][0] * sub_factor00 - m[1][2] * sub_factor03 + m[1][3] * sub_factor04);
+   adj[2][0] =   (m[1][0] * sub_factor01 - m[1][1] * sub_factor03 + m[1][3] * sub_factor05);
+   adj[3][0] = - (m[1][0] * sub_factor02 - m[1][1] * sub_factor04 + m[1][2] * sub_factor05);
+   adj[0][1] = - (m[0][1] * sub_factor00 - m[0][2] * sub_factor01 + m[0][3] * sub_factor02);
+   adj[1][1] =   (m[0][0] * sub_factor00 - m[0][2] * sub_factor03 + m[0][3] * sub_factor04);
+   adj[2][1] = - (m[0][0] * sub_factor01 - m[0][1] * sub_factor03 + m[0][3] * sub_factor05);
+   adj[3][1] =   (m[0][0] * sub_factor02 - m[0][1] * sub_factor04 + m[0][2] * sub_factor05);
+   adj[0][2] =   (m[0][1] * sub_factor06 - m[0][2] * sub_factor07 + m[0][3] * sub_factor08);
+   adj[1][2] = - (m[0][0] * sub_factor06 - m[0][2] * sub_factor09 + m[0][3] * sub_factor10);
+   adj[2][2] =   (m[0][0] * sub_factor11 - m[0][1] * sub_factor09 + m[0][3] * sub_factor12);
+   adj[3][2] = - (m[0][0] * sub_factor08 - m[0][1] * sub_factor10 + m[0][2] * sub_factor12);
+   adj[0][3] = - (m[0][1] * sub_factor13 - m[0][2] * sub_factor14 + m[0][3] * sub_factor15);
+   adj[1][3] =   (m[0][0] * sub_factor13 - m[0][2] * sub_factor16 + m[0][3] * sub_factor17);
+   adj[2][3] = - (m[0][0] * sub_factor14 - m[0][1] * sub_factor16 + m[0][3] * sub_factor18);
+   adj[3][3] =   (m[0][0] * sub_factor15 - m[0][1] * sub_factor17 + m[0][2] * sub_factor18);
+
+   let det = (m[0][0] * adj[0][0] + m[0][1] * adj[1][0] + m[0][2] * adj[2][0] + m[0][3] * adj[3][0]);
+
+   return adj * (1 / det);
+}
+
+fn _naga_inverse_3x3_f32(m: mat3x3<f32>) -> mat3x3<f32> {
+    var adj: mat3x3<f32>;
+
+    adj[0][0] =   (m[1][1] * m[2][2] - m[2][1] * m[1][2]);
+    adj[1][0] = - (m[1][0] * m[2][2] - m[2][0] * m[1][2]);
+    adj[2][0] =   (m[1][0] * m[2][1] - m[2][0] * m[1][1]);
+    adj[0][1] = - (m[0][1] * m[2][2] - m[2][1] * m[0][2]);
+    adj[1][1] =   (m[0][0] * m[2][2] - m[2][0] * m[0][2]);
+    adj[2][1] = - (m[0][0] * m[2][1] - m[2][0] * m[0][1]);
+    adj[0][2] =   (m[0][1] * m[1][2] - m[1][1] * m[0][2]);
+    adj[1][2] = - (m[0][0] * m[1][2] - m[1][0] * m[0][2]);
+    adj[2][2] =   (m[0][0] * m[1][1] - m[1][0] * m[0][1]);
+
+    let det: f32 = (m[0][0] * (m[1][1] * m[2][2] - m[1][2] * m[2][1])
+    		- m[0][1] * (m[1][0] * m[2][2] - m[1][2] * m[2][0])
+    		+ m[0][2] * (m[1][0] * m[2][1] - m[1][1] * m[2][0]));
+
+    return adj * (1 / det);
+}
+
+fn _naga_inverse_2x2_f32(m: mat2x2<f32>) -> mat2x2<f32> {
+    var adj: mat2x2<f32>;
+    adj[0][0] = m[1][1];
+    adj[0][1] = -m[0][1];
+    adj[1][0] = -m[1][0];
+    adj[1][1] = m[0][0];
+
+    let det: f32 = m[0][0] * m[1][1] - m[1][0] * m[0][1];
+    return adj * (1 / det);
+}

naga/tests/snapshots.rs

@@ -62,6 +62,7 @@ struct SpirvOutParameters {
 struct WgslOutParameters {
     #[serde(default)]
     explicit_types: bool,
+    polyfill_inverse: bool,
 }
 
 #[derive(Default, serde::Deserialize)]
@@ -665,6 +666,7 @@ fn write_output_wgsl(
 
     let mut flags = wgsl::WriterFlags::empty();
     flags.set(wgsl::WriterFlags::EXPLICIT_TYPES, params.explicit_types);
+    flags.set(wgsl::WriterFlags::POLYFILL_INVERSE, params.polyfill_inverse);
 
     let string = wgsl::write_string(module, info, flags).expect("WGSL write failed");
 
@@ -1127,7 +1129,15 @@ fn convert_glsl_folder() {
 
         #[cfg(wgsl_out)]
         {
-            write_output_wgsl(&input, &module, &info, &WgslOutParameters::default());
+            write_output_wgsl(
+                &input,
+                &module,
+                &info,
+                &WgslOutParameters {
+                    polyfill_inverse: true,
+                    ..Default::default()
+                },
+            );
         }
     }
 }