From 0a8c5c8622de649ed3cf2523f7ca77274832b957 Mon Sep 17 00:00:00 2001
From: vonchenplus <vonchenplus@gmail.com>
Date: Sat, 20 Aug 2022 16:58:01 +0800
Subject: [PATCH] video_core: support framebuffer crop rect top not zero

---
 .../renderer_opengl/renderer_opengl.cpp       | 19 +++++++++++++------
 .../renderer_vulkan/vk_blit_screen.cpp        | 18 ++++++++++++------
 2 files changed, 25 insertions(+), 12 deletions(-)

diff --git a/src/video_core/renderer_opengl/renderer_opengl.cpp b/src/video_core/renderer_opengl/renderer_opengl.cpp
index 01028cee0..34f3f7a67 100644
--- a/src/video_core/renderer_opengl/renderer_opengl.cpp
+++ b/src/video_core/renderer_opengl/renderer_opengl.cpp
@@ -478,13 +478,16 @@ void RendererOpenGL::DrawScreen(const Layout::FramebufferLayout& layout) {
         }
     }
 
-    ASSERT_MSG(framebuffer_crop_rect.top == 0, "Unimplemented");
     ASSERT_MSG(framebuffer_crop_rect.left == 0, "Unimplemented");
 
+    f32 left_start{};
+    if (framebuffer_crop_rect.Top() > 0) {
+        left_start = static_cast<f32>(framebuffer_crop_rect.Top()) /
+                     static_cast<f32>(framebuffer_crop_rect.Bottom());
+    }
     f32 scale_u = static_cast<f32>(framebuffer_width) / static_cast<f32>(screen_info.texture.width);
     f32 scale_v =
         static_cast<f32>(framebuffer_height) / static_cast<f32>(screen_info.texture.height);
-
     // Scale the output by the crop width/height. This is commonly used with 1280x720 rendering
     // (e.g. handheld mode) on a 1920x1080 framebuffer.
     if (framebuffer_crop_rect.GetWidth() > 0) {
@@ -503,10 +506,14 @@ void RendererOpenGL::DrawScreen(const Layout::FramebufferLayout& layout) {
 
     const auto& screen = layout.screen;
     const std::array vertices = {
-        ScreenRectVertex(screen.left, screen.top, texcoords.top * scale_u, left * scale_v),
-        ScreenRectVertex(screen.right, screen.top, texcoords.bottom * scale_u, left * scale_v),
-        ScreenRectVertex(screen.left, screen.bottom, texcoords.top * scale_u, right * scale_v),
-        ScreenRectVertex(screen.right, screen.bottom, texcoords.bottom * scale_u, right * scale_v),
+        ScreenRectVertex(screen.left, screen.top, texcoords.top * scale_u,
+                         left_start + left * scale_v),
+        ScreenRectVertex(screen.right, screen.top, texcoords.bottom * scale_u,
+                         left_start + left * scale_v),
+        ScreenRectVertex(screen.left, screen.bottom, texcoords.top * scale_u,
+                         left_start + right * scale_v),
+        ScreenRectVertex(screen.right, screen.bottom, texcoords.bottom * scale_u,
+                         left_start + right * scale_v),
     };
     glNamedBufferSubData(vertex_buffer.handle, 0, sizeof(vertices), std::data(vertices));
 
diff --git a/src/video_core/renderer_vulkan/vk_blit_screen.cpp b/src/video_core/renderer_vulkan/vk_blit_screen.cpp
index 27e6ebf94..444c29f68 100644
--- a/src/video_core/renderer_vulkan/vk_blit_screen.cpp
+++ b/src/video_core/renderer_vulkan/vk_blit_screen.cpp
@@ -1402,12 +1402,15 @@ void BlitScreen::SetVertexData(BufferData& data, const Tegra::FramebufferConfig&
         break;
     }
 
-    UNIMPLEMENTED_IF(framebuffer_crop_rect.top != 0);
     UNIMPLEMENTED_IF(framebuffer_crop_rect.left != 0);
 
+    f32 left_start{};
+    if (framebuffer_crop_rect.Top() > 0) {
+        left_start = static_cast<f32>(framebuffer_crop_rect.Top()) /
+                     static_cast<f32>(framebuffer_crop_rect.Bottom());
+    }
     f32 scale_u = static_cast<f32>(framebuffer.width) / static_cast<f32>(screen_info.width);
     f32 scale_v = static_cast<f32>(framebuffer.height) / static_cast<f32>(screen_info.height);
-
     // Scale the output by the crop width/height. This is commonly used with 1280x720 rendering
     // (e.g. handheld mode) on a 1920x1080 framebuffer.
     if (!fsr) {
@@ -1426,10 +1429,13 @@ void BlitScreen::SetVertexData(BufferData& data, const Tegra::FramebufferConfig&
     const auto y = static_cast<f32>(screen.top);
     const auto w = static_cast<f32>(screen.GetWidth());
     const auto h = static_cast<f32>(screen.GetHeight());
-    data.vertices[0] = ScreenRectVertex(x, y, texcoords.top * scale_u, left * scale_v);
-    data.vertices[1] = ScreenRectVertex(x + w, y, texcoords.bottom * scale_u, left * scale_v);
-    data.vertices[2] = ScreenRectVertex(x, y + h, texcoords.top * scale_u, right * scale_v);
-    data.vertices[3] = ScreenRectVertex(x + w, y + h, texcoords.bottom * scale_u, right * scale_v);
+    data.vertices[0] = ScreenRectVertex(x, y, texcoords.top * scale_u, left_start + left * scale_v);
+    data.vertices[1] =
+        ScreenRectVertex(x + w, y, texcoords.bottom * scale_u, left_start + left * scale_v);
+    data.vertices[2] =
+        ScreenRectVertex(x, y + h, texcoords.top * scale_u, left_start + right * scale_v);
+    data.vertices[3] =
+        ScreenRectVertex(x + w, y + h, texcoords.bottom * scale_u, left_start + right * scale_v);
 }
 
 void BlitScreen::CreateFSR() {