From ab4867505ec0d3f5a9ec4f042ccd6f7890e3632e Mon Sep 17 00:00:00 2001
From: gdkchan <gab.dark.100@gmail.com>
Date: Sun, 29 Mar 2020 00:02:58 -0300
Subject: Implement GPU scissors (#1058)

* Implement GPU scissors

* Remove unused using

* Add missing changes for Clear
---
 Ryujinx.Graphics.Gpu/Engine/Methods.cs | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

(limited to 'Ryujinx.Graphics.Gpu/Engine/Methods.cs')

diff --git a/Ryujinx.Graphics.Gpu/Engine/Methods.cs b/Ryujinx.Graphics.Gpu/Engine/Methods.cs
index a2c9876e..0b30e61d 100644
--- a/Ryujinx.Graphics.Gpu/Engine/Methods.cs
+++ b/Ryujinx.Graphics.Gpu/Engine/Methods.cs
@@ -117,6 +117,11 @@ namespace Ryujinx.Graphics.Gpu.Engine
                 UpdateRenderTargetState(state, useControl: true);
             }
 
+            if (state.QueryModified(MethodOffset.ScissorState))
+            {
+                UpdateScissorState(state);
+            }
+
             if (state.QueryModified(MethodOffset.DepthTestEnable,
                                     MethodOffset.DepthWriteEnable,
                                     MethodOffset.DepthTestFunc))
@@ -321,6 +326,27 @@ namespace Ryujinx.Graphics.Gpu.Engine
             return colorState.Format != 0 && colorState.WidthOrStride != 0;
         }
 
+        /// <summary>
+        /// Updates host scissor test state based on current GPU state.
+        /// </summary>
+        /// <param name="state">Current GPU state</param>
+        private void UpdateScissorState(GpuState state)
+        {
+            for (int index = 0; index < Constants.TotalViewports; index++)
+            {
+                ScissorState scissor = state.Get<ScissorState>(MethodOffset.ScissorState, index);
+
+                bool enable = scissor.Enable && (scissor.X1 != 0 || scissor.Y1 != 0 || scissor.X2 != 0xffff || scissor.Y2 != 0xffff);
+
+                _context.Renderer.Pipeline.SetScissorEnable(index, enable);
+
+                if (enable)
+                {
+                    _context.Renderer.Pipeline.SetScissor(index, scissor.X1, scissor.Y1, scissor.X2 - scissor.X1, scissor.Y2 - scissor.Y1);
+                }
+            }
+        }
+
         /// <summary>
         /// Updates host depth test state based on current GPU state.
         /// </summary>
-- 
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