fixup! Initial implementation of yuv444in420 encoding

src/platform/windows/display_vram.cpp

@@ -530,15 +530,22 @@ namespace platf::dxgi {
         out_Y_or_YUV_viewports[0] = { offsetX, offsetY, out_width_f, out_height_f, 0.0f, 1.0f };  // Y plane
         out_Y_or_YUV_viewports[1] = out_Y_or_YUV_viewports[0];  // left half of U plane
         out_Y_or_YUV_viewports[1].TopLeftY += out_height;
-        out_Y_or_YUV_viewports[1].Width /= 2;
+        out_Y_or_YUV_viewports[1].Width = out_width / 2 - offsetX;
         out_Y_or_YUV_viewports[2] = out_Y_or_YUV_viewports[1];  // left half of V plane
-        out_Y_or_YUV_viewports[2].TopLeftX += out_Y_or_YUV_viewports[1].Width;
+        out_Y_or_YUV_viewports[2].TopLeftX += out_width / 2;
 
-        out_Y_or_YUV_viewports_for_clear = out_Y_or_YUV_viewports;  // TODO: do this properly
+        out_Y_or_YUV_viewports_for_clear[0] = { 0, 0, (float) out_width, (float) out_height, 0.0f, 1.0f };  // Y plane
+        out_Y_or_YUV_viewports_for_clear[1] = out_Y_or_YUV_viewports_for_clear[0];  // left half of U plane
+        out_Y_or_YUV_viewports_for_clear[1].TopLeftY += out_height;
+        out_Y_or_YUV_viewports_for_clear[1].Width /= 2;
+        out_Y_or_YUV_viewports_for_clear[2] = out_Y_or_YUV_viewports_for_clear[1];  // left half of V plane
+        out_Y_or_YUV_viewports_for_clear[2].TopLeftX += out_Y_or_YUV_viewports_for_clear[1].Width;
 
         out_UV_viewport = out_Y_or_YUV_viewports[0];
-        out_UV_viewport.Width /= 2;
-        out_UV_viewport_for_clear = out_UV_viewport;  // TODO: do this properly
+        out_UV_viewport.TopLeftX = 0;
+        out_UV_viewport.Width = out_width_f - out_Y_or_YUV_viewports[1].Width;
+
+        out_UV_viewport_for_clear = { 0, 0, (float) out_width / 2, (float) out_height, 0.0f, 1.0f };
       }
       else {
         out_Y_or_YUV_viewports[0] = { offsetX, offsetY, out_width_f, out_height_f, 0.0f, 1.0f };  // Y plane