Merge pull request #4085 from Armada651/vertex-depth

VideoCommon: Implement depth range equation in vertex shader.

1 files changed, 6 insertions, 0 deletions

diff --git a/Source/Core/VideoCommon/RenderBase.cpp b/Source/Core/VideoCommon/RenderBase.cpp
index fade0d00b9..3b50cd2313 100644
--- a/Source/Core/VideoCommon/RenderBase.cpp
+++ b/Source/Core/VideoCommon/RenderBase.cpp
@@ -86,6 +86,12 @@ unsigned int Renderer::efb_scale_numeratorY = 1;
 unsigned int Renderer::efb_scale_denominatorX = 1;
 unsigned int Renderer::efb_scale_denominatorY = 1;
 
+// The maximum depth that is written to the depth buffer should never exceed this value.
+// This is necessary because we use a 2^24 divisor for all our depth values to prevent
+// floating-point round-trip errors. However the console GPU doesn't ever write a value
+// to the depth buffer that exceeds 2^24 - 1.
+const float Renderer::GX_MAX_DEPTH = 16777215.0f / 16777216.0f;
+
 static float AspectToWidescreen(float aspect)
 {
   return aspect * ((16.0f / 9.0f) / (4.0f / 3.0f));