aurora: add asynchronous OpenXR stereo replay bridge

aurora-main/tests/stereo_replay_test.cpp

@@ -0,0 +1,41 @@
+#include "gfx/stereo_replay.hpp"
+
+#include <gtest/gtest.h>
+
+namespace aurora::gfx::stereo_replay {
+namespace {
+
+TEST(StereoReplayTest, EyeFrustumPreservesGameDepthMapping) {
+  const Mat4x4<float> game{
+      {10.0f, 11.0f, 12.0f, 13.0f},
+      {20.0f, 21.0f, 22.0f, 23.0f},
+      {30.0f, 31.0f, 32.0f, 33.0f},
+      {40.0f, 41.0f, 42.0f, 43.0f},
+  };
+  const Mat4x4<float> eye{
+      {1.1f, 1.2f, 1.3f, 1.4f},
+      {2.1f, 2.2f, 2.3f, 2.4f},
+      {3.1f, 3.2f, 3.3f, 3.4f},
+      {4.1f, 4.2f, 4.3f, 4.4f},
+  };
+
+  const auto result = compose_projection(eye, game);
+
+  EXPECT_FLOAT_EQ(result.m0[0], eye.m0[0]);
+  EXPECT_FLOAT_EQ(result.m0[2], eye.m0[2]);
+  EXPECT_FLOAT_EQ(result.m1[1], eye.m1[1]);
+  EXPECT_FLOAT_EQ(result.m1[2], eye.m1[2]);
+  for (size_t row = 0; row < 4; ++row) {
+    for (size_t column = 0; column < 4; ++column) {
+      const bool frustumTerm =
+          (row == 0 && (column == 0 || column == 2)) ||
+          (row == 1 && (column == 1 || column == 2));
+      if (!frustumTerm) {
+        EXPECT_FLOAT_EQ(result[row][column], game[row][column]);
+      }
+    }
+  }
+}
+
+} // namespace
+} // namespace aurora::gfx::stereo_replay