Vulkan: Implement Depth Bias Control

1 files changed, 22 insertions, 3 deletions

diff --git a/src/video_core/renderer_vulkan/vk_rasterizer.cpp b/src/video_core/renderer_vulkan/vk_rasterizer.cpp
index 01e76a82c..0201c4d08 100644
--- a/src/video_core/renderer_vulkan/vk_rasterizer.cpp
+++ b/src/video_core/renderer_vulkan/vk_rasterizer.cpp
@@ -1043,15 +1043,34 @@ void RasterizerVulkan::UpdateDepthBias(Tegra::Engines::Maxwell3D::Regs& regs) {
                         regs.zeta.format == Tegra::DepthFormat::X8Z24_UNORM ||
                         regs.zeta.format == Tegra::DepthFormat::S8Z24_UNORM ||
                         regs.zeta.format == Tegra::DepthFormat::V8Z24_UNORM;
-    if (is_d24 && !device.SupportsD24DepthBuffer()) {
+    bool force_unorm = ([&] {
+        if (!is_d24 || device.SupportsD24DepthBuffer()) {
+            return false;
+        }
+        if (device.IsExtDepthBiasControlSupported()) {
+            return true;
+        }
         // 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);
-    }
+        return false;
+    })();
     scheduler.Record([constant = units, clamp = regs.depth_bias_clamp,
-                      factor = regs.slope_scale_depth_bias](vk::CommandBuffer cmdbuf) {
+                      factor = regs.slope_scale_depth_bias, force_unorm,
+                      precise = device.HasExactDepthBiasControl()](vk::CommandBuffer cmdbuf) {
+        if (force_unorm) {
+            VkDepthBiasRepresentationInfoEXT info{
+                .sType = VK_STRUCTURE_TYPE_DEPTH_BIAS_REPRESENTATION_INFO_EXT,
+                .pNext = nullptr,
+                .depthBiasRepresentation =
+                    VK_DEPTH_BIAS_REPRESENTATION_LEAST_REPRESENTABLE_VALUE_FORCE_UNORM_EXT,
+                .depthBiasExact = precise ? VK_TRUE : VK_FALSE,
+            };
+            cmdbuf.SetDepthBias(constant, clamp, factor, &info);
+            return;
+        }
         cmdbuf.SetDepthBias(constant, clamp, factor);
     });
 }