From 057117f0096a47b07f9070d48a0dbd952ab0522e Mon Sep 17 00:00:00 2001
From: bunnei <bunneidev@gmail.com>
Date: Thu, 1 Jun 2023 17:57:49 -0700
Subject: android: Fix presentation layout on foldable and tablet devices.

---
 src/video_core/renderer_vulkan/vk_blit_screen.cpp | 55 +++++++++++++++++++----
 1 file changed, 47 insertions(+), 8 deletions(-)

(limited to 'src/video_core/renderer_vulkan')

diff --git a/src/video_core/renderer_vulkan/vk_blit_screen.cpp b/src/video_core/renderer_vulkan/vk_blit_screen.cpp
index e4c581a28..7cdde992b 100644
--- a/src/video_core/renderer_vulkan/vk_blit_screen.cpp
+++ b/src/video_core/renderer_vulkan/vk_blit_screen.cpp
@@ -37,6 +37,10 @@
 #include "video_core/vulkan_common/vulkan_memory_allocator.h"
 #include "video_core/vulkan_common/vulkan_wrapper.h"
 
+#ifdef ANDROID
+extern u32 GetAndroidScreenRotation();
+#endif
+
 namespace Vulkan {
 
 namespace {
@@ -74,23 +78,58 @@ struct ScreenRectVertex {
     }
 };
 
-constexpr std::array<f32, 4 * 4> MakeOrthographicMatrix(f32 width, f32 height) {
-    // clang-format off
 #ifdef ANDROID
-    // Android renders in portrait, so rotate the matrix.
-    return { 0.f,          2.f / width, 0.f, 0.f,
-            -2.f / height, 0.f,         0.f, 0.f,
-             0.f,          0.f,         1.f, 0.f,
-             1.f,         -1.f,         0.f, 1.f};
+
+std::array<f32, 4 * 4> MakeOrthographicMatrix(f32 width, f32 height) {
+    constexpr u32 ROTATION_0 = 0;
+    constexpr u32 ROTATION_90 = 1;
+    constexpr u32 ROTATION_180 = 2;
+    constexpr u32 ROTATION_270 = 3;
+
+    // clang-format off
+    switch (GetAndroidScreenRotation()) {
+        case ROTATION_0:
+            // Desktop
+            return { 2.f / width, 0.f,          0.f, 0.f,
+                     0.f,         2.f / height, 0.f, 0.f,
+                     0.f,         0.f,          1.f, 0.f,
+                    -1.f,        -1.f,          0.f, 1.f};
+        case ROTATION_180:
+            // Reverse desktop
+            return {-2.f / width, 0.f,          0.f, 0.f,
+                     0.f,        -2.f / height, 0.f, 0.f,
+                     0.f,         0.f,          1.f, 0.f,
+                     1.f,         1.f,          0.f, 1.f};
+        case ROTATION_270:
+            // Reverse landscape
+            return { 0.f,         -2.f / width, 0.f, 0.f,
+                     2.f / height, 0.f,         0.f, 0.f,
+                     0.f,          0.f,         1.f, 0.f,
+                    -1.f,          1.f,         0.f, 1.f};
+        case ROTATION_90:
+        default:
+            // Landscape
+            return { 0.f,          2.f / width, 0.f, 0.f,
+                    -2.f / height, 0.f,         0.f, 0.f,
+                     0.f,          0.f,         1.f, 0.f,
+                     1.f,         -1.f,         0.f, 1.f};
+    }
+    // clang-format on
+}
+
 #else
+
+std::array<f32, 4 * 4> MakeOrthographicMatrix(f32 width, f32 height) {
+    // clang-format off
     return { 2.f / width, 0.f,          0.f, 0.f,
              0.f,         2.f / height, 0.f, 0.f,
              0.f,         0.f,          1.f, 0.f,
             -1.f,        -1.f,          0.f, 1.f};
-#endif // ANDROID
     // clang-format on
 }
 
+#endif
+
 u32 GetBytesPerPixel(const Tegra::FramebufferConfig& framebuffer) {
     using namespace VideoCore::Surface;
     return BytesPerBlock(PixelFormatFromGPUPixelFormat(framebuffer.pixel_format));
-- 
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