Vulkan: Add negative Z clipping.

hrydgard · Oct 13, 2021 · 273b9a3 · 273b9a3
1 parent 24011c3
commit 273b9a3
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Showing 2 changed files with 8 additions and 0 deletions.
diff --git a/Common/GPU/Vulkan/VulkanContext.cpp b/Common/GPU/Vulkan/VulkanContext.cpp
@@ -580,6 +580,8 @@ void VulkanContext::ChooseDevice(int physical_device) {
 	deviceFeatures_.enabled.depthClamp = deviceFeatures_.available.depthClamp;
 	deviceFeatures_.enabled.depthBounds = deviceFeatures_.available.depthBounds;
 	deviceFeatures_.enabled.samplerAnisotropy = deviceFeatures_.available.samplerAnisotropy;
+	deviceFeatures_.enabled.shaderClipDistance = deviceFeatures_.available.shaderClipDistance;
+	deviceFeatures_.enabled.shaderCullDistance = deviceFeatures_.available.shaderCullDistance;
 	// For easy wireframe mode, someday.
 	deviceFeatures_.enabled.fillModeNonSolid = deviceFeatures_.available.fillModeNonSolid;
 

diff --git a/GPU/Common/VertexShaderGenerator.cpp b/GPU/Common/VertexShaderGenerator.cpp
@@ -105,6 +105,8 @@ const char *boneWeightAttrInitHLSL[9] = {
 // to 0 and 65535 if a depth clamping/clipping flag is set (x/y clipping is performed only if depth
 // needs to be clamped.)
 //
+// Additionally, depth is clipped to negative z based on vec.z (before viewport), at -1.
+//
 // All this above is for full transform mode.
 // In through mode, the Z coordinate just goes straight through and there is no perspective division.
 // We simulate this of course with pretty much an identity matrix. Rounding Z becomes very easy.
@@ -1107,6 +1109,10 @@ bool GenerateVertexShader(const VShaderID &id, char *buffer, const ShaderLanguag
 		WRITE(p, "      outPos.xyzw = u_cullRangeMax.wwww;\n");
 		WRITE(p, "    }\n");
 		WRITE(p, "  }\n");
+
+		if (compat.shaderLanguage == GLSL_VULKAN) {
+			WRITE(p, "  %sgl_ClipDistance[0] = projZ * outPos.w + outPos.w;\n", compat.vsOutPrefix);
+		}
 	}
 
 	// We've named the output gl_Position in HLSL as well.