Merge pull request #4085 from Armada651/vertex-depth

VideoCommon: Implement depth range equation in vertex shader.

1 files changed, 9 insertions, 0 deletions

diff --git a/Source/Core/VideoCommon/VertexShaderManager.cpp b/Source/Core/VideoCommon/VertexShaderManager.cpp
index 19fb1f371d..9b1c3437fe 100644
--- a/Source/Core/VideoCommon/VertexShaderManager.cpp
+++ b/Source/Core/VideoCommon/VertexShaderManager.cpp
@@ -386,6 +386,15 @@ void VertexShaderManager::SetConstants()
     const float pixel_size_y = 2.f / Renderer::EFBToScaledXf(2.f * xfmem.viewport.ht);
     constants.pixelcentercorrection[0] = pixel_center_correction * pixel_size_x;
     constants.pixelcentercorrection[1] = pixel_center_correction * pixel_size_y;
+
+    // The depth range is handled in the vertex shader. We need to reverse
+    // the far value to get a reversed depth range mapping. This is necessary
+    // because the standard depth range equation pushes all depth values towards
+    // the back of the depth buffer where conventionally depth buffers have the
+    // least precision.
+    constants.pixelcentercorrection[2] = xfmem.viewport.zRange / 16777215.0f;
+    constants.pixelcentercorrection[3] = 1.0f - xfmem.viewport.farZ / 16777215.0f;
+
     dirty = true;
     // This is so implementation-dependent that we can't have it here.
     g_renderer->SetViewport();