From ad8afaf1ef0c2f6c9ecb4e3670d4a3e4192ab0a9 Mon Sep 17 00:00:00 2001
From: Fernando Sahmkow <fsahmkow27@gmail.com>
Date: Sun, 17 Oct 2021 03:49:18 +0200
Subject: [PATCH] Vulran Rasterizer: address feedback.

---
 src/video_core/renderer_vulkan/vk_rasterizer.cpp | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/src/video_core/renderer_vulkan/vk_rasterizer.cpp b/src/video_core/renderer_vulkan/vk_rasterizer.cpp
index 04ecc034d..30b47a7a0 100644
--- a/src/video_core/renderer_vulkan/vk_rasterizer.cpp
+++ b/src/video_core/renderer_vulkan/vk_rasterizer.cpp
@@ -633,10 +633,12 @@ void RasterizerVulkan::UpdateDepthBias(Tegra::Engines::Maxwell3D::Regs& regs) {
                         regs.zeta.format == Tegra::DepthFormat::D24S8_UNORM ||
                         regs.zeta.format == Tegra::DepthFormat::D24C8_UNORM;
     if (is_d24 && !device.SupportsD24DepthBuffer()) {
-        const double f = static_cast<double>(1ULL << (32 - 24)) / (static_cast<double>(0x1.ep+127));
-        units = static_cast<float>(static_cast<double>(units) * f);
+        // the base formulas can be obtained from here:
+        //   https://docs.microsoft.com/en-us/windows/win32/direct3d11/d3d10-graphics-programming-guide-output-merger-stage-depth-bias
+        const double rescale_factor =
+            static_cast<double>(1ULL << (32 - 24)) / (static_cast<double>(0x1.ep+127));
+        units = static_cast<float>(static_cast<double>(units) * rescale_factor);
     }
-
     scheduler.Record([constant = units, clamp = regs.polygon_offset_clamp,
                       factor = regs.polygon_offset_factor](vk::CommandBuffer cmdbuf) {
         cmdbuf.SetDepthBias(constant, clamp, factor);