Scissor test fix (#563)

* Handle negative viewport coordinates

* Disable scissor before framebuffer blit

* Comment to explain scissor disable will be reenabled if needed

* Comma and spelling mistake

1 files changed, 7 insertions, 1 deletions

diff --git a/Ryujinx.Graphics/Graphics3d/NvGpuEngine3d.cs b/Ryujinx.Graphics/Graphics3d/NvGpuEngine3d.cs
index 7de76cce..749f5fdc 100644
--- a/Ryujinx.Graphics/Graphics3d/NvGpuEngine3d.cs
+++ b/Ryujinx.Graphics/Graphics3d/NvGpuEngine3d.cs
@@ -419,7 +419,7 @@ namespace Ryujinx.Graphics.Graphics3d
             // Once geometry shaders are fixed it should be equal to GalPipelineState.RenderTargetCount when shader loaded, otherwise equal to 1
             State.ScissorTestCount = 1;
 
-            for (int Index = 0; Index < GalPipelineState.RenderTargetsCount; Index++)
+            for (int Index = 0; Index < State.ScissorTestCount; Index++)
             {
                 State.ScissorTestEnabled[Index] = ReadRegisterBool(NvGpuEngine3dReg.ScissorEnable + Index * 4);
 
@@ -438,6 +438,12 @@ namespace Ryujinx.Graphics.Graphics3d
                     if ((int)State.FlipY == -1)
                     {
                         State.ScissorTestY[Index] = ViewportHeight - State.ScissorTestY[Index] - State.ScissorTestHeight[Index];
+
+                        // Handle negative viewpont coordinate
+                        if (State.ScissorTestY[Index] < 0)
+                        {
+                            State.ScissorTestY[Index] = 0;
+                        }
                     }
                 }
             }