From 73e2be0447b33fd30ed911f55596fa46e35061ea Mon Sep 17 00:00:00 2001
From: Artem Kharytoniuk <artemalive@gmail.com>
Date: Fri, 28 Apr 2017 19:13:24 +0300
Subject: [PATCH] Mirrors and portals.

---
 config/visual-studio/renderer.vcxproj         |   2 +
 config/visual-studio/renderer.vcxproj.filters |   6 +
 .../shaders/multi_texture_clipping_plane.vert |  33 +++++
 .../single_texture_clipping_plane.vert        |  30 ++++
 .../multi_texture_clipping_plane_vert.cpp     | 132 ++++++++++++++++++
 .../single_texture_clipping_plane_vert.cpp    | 123 ++++++++++++++++
 src/engine/renderer/tr_local.h                |   3 +-
 src/engine/renderer/tr_shade.c                |   8 +-
 src/engine/renderer/tr_shader.c               |  10 ++
 src/engine/renderer/vk.cpp                    |  81 +++++++++--
 src/engine/renderer/vk.h                      |   4 +
 11 files changed, 418 insertions(+), 14 deletions(-)
 create mode 100644 src/engine/renderer/shaders/multi_texture_clipping_plane.vert
 create mode 100644 src/engine/renderer/shaders/single_texture_clipping_plane.vert
 create mode 100644 src/engine/renderer/shaders/spirv/multi_texture_clipping_plane_vert.cpp
 create mode 100644 src/engine/renderer/shaders/spirv/single_texture_clipping_plane_vert.cpp

diff --git a/config/visual-studio/renderer.vcxproj b/config/visual-studio/renderer.vcxproj
index c071283..a31e3d1 100644
--- a/config/visual-studio/renderer.vcxproj
+++ b/config/visual-studio/renderer.vcxproj
@@ -100,8 +100,10 @@
   </ItemDefinitionGroup>
   <ItemGroup>
     <ClCompile Include="..\..\src\engine\renderer\shaders\spirv\multi_texture_add_frag.cpp" />
+    <ClCompile Include="..\..\src\engine\renderer\shaders\spirv\multi_texture_clipping_plane_vert.cpp" />
     <ClCompile Include="..\..\src\engine\renderer\shaders\spirv\multi_texture_mul_frag.cpp" />
     <ClCompile Include="..\..\src\engine\renderer\shaders\spirv\multi_texture_vert.cpp" />
+    <ClCompile Include="..\..\src\engine\renderer\shaders\spirv\single_texture_clipping_plane_vert.cpp" />
     <ClCompile Include="..\..\src\engine\renderer\shaders\spirv\single_texture_frag.cpp" />
     <ClCompile Include="..\..\src\engine\renderer\shaders\spirv\single_texture_vert.cpp" />
     <ClCompile Include="..\..\src\engine\renderer\tr_animation.c" />
diff --git a/config/visual-studio/renderer.vcxproj.filters b/config/visual-studio/renderer.vcxproj.filters
index 17ad847..cae39a8 100644
--- a/config/visual-studio/renderer.vcxproj.filters
+++ b/config/visual-studio/renderer.vcxproj.filters
@@ -110,6 +110,12 @@
     <ClCompile Include="..\..\src\engine\renderer\shaders\spirv\single_texture_vert.cpp">
       <Filter>Source Files\spirv</Filter>
     </ClCompile>
+    <ClCompile Include="..\..\src\engine\renderer\shaders\spirv\multi_texture_clipping_plane_vert.cpp">
+      <Filter>Source Files\spirv</Filter>
+    </ClCompile>
+    <ClCompile Include="..\..\src\engine\renderer\shaders\spirv\single_texture_clipping_plane_vert.cpp">
+      <Filter>Source Files\spirv</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="..\..\src\engine\qcommon\cm_public.h">
diff --git a/src/engine/renderer/shaders/multi_texture_clipping_plane.vert b/src/engine/renderer/shaders/multi_texture_clipping_plane.vert
new file mode 100644
index 0000000..4eae97b
--- /dev/null
+++ b/src/engine/renderer/shaders/multi_texture_clipping_plane.vert
@@ -0,0 +1,33 @@
+#version 450
+
+// 128 bytes
+layout(push_constant) uniform Transform {
+    mat4 clip_space_xform;
+    mat3x4 eye_space_xform;
+    vec4 clipping_plane; // in eye space
+};
+
+layout(location = 0) in vec3 in_position;
+layout(location = 1) in vec4 in_color;
+layout(location = 2) in vec2 in_tex_coord0;
+layout(location = 3) in vec2 in_tex_coord1;
+
+layout(location = 0) out vec4 frag_color;
+layout(location = 1) out vec2 frag_tex_coord0;
+layout(location = 2) out vec2 frag_tex_coord1;
+
+out gl_PerVertex {
+    vec4 gl_Position;
+    float gl_ClipDistance[1];
+};
+
+void main() {
+    vec4 p = vec4(in_position, 1.0);
+
+    gl_Position = clip_space_xform *  p;
+    gl_ClipDistance[0] = dot(clipping_plane, vec4(p * eye_space_xform, 1.0));
+
+    frag_color = in_color;
+    frag_tex_coord0 = in_tex_coord0;
+    frag_tex_coord1 = in_tex_coord1;
+}
diff --git a/src/engine/renderer/shaders/single_texture_clipping_plane.vert b/src/engine/renderer/shaders/single_texture_clipping_plane.vert
new file mode 100644
index 0000000..b1c2b5d
--- /dev/null
+++ b/src/engine/renderer/shaders/single_texture_clipping_plane.vert
@@ -0,0 +1,30 @@
+#version 450
+
+// 128 bytes
+layout(push_constant) uniform Transform {
+    mat4 clip_space_xform;
+    mat3x4 eye_space_xform;
+    vec4 clipping_plane; // in eye space
+};
+
+layout(location = 0) in vec3 in_position;
+layout(location = 1) in vec4 in_color;
+layout(location = 2) in vec2 in_tex_coord;
+
+layout(location = 0) out vec4 frag_color;
+layout(location = 1) out vec2 frag_tex_coord;
+
+out gl_PerVertex {
+    vec4 gl_Position;
+    float gl_ClipDistance[1];
+};
+
+void main() {
+    vec4 p = vec4(in_position, 1.0);
+
+    gl_Position = clip_space_xform *  p;
+    gl_ClipDistance[0] = dot(clipping_plane, vec4(p * eye_space_xform, 1.0));
+
+    frag_color = in_color;
+    frag_tex_coord = in_tex_coord;
+}
diff --git a/src/engine/renderer/shaders/spirv/multi_texture_clipping_plane_vert.cpp b/src/engine/renderer/shaders/spirv/multi_texture_clipping_plane_vert.cpp
new file mode 100644
index 0000000..6457f0e
--- /dev/null
+++ b/src/engine/renderer/shaders/spirv/multi_texture_clipping_plane_vert.cpp
@@ -0,0 +1,132 @@
+unsigned char multi_texture_clipping_plane_vert_spv[] = {
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+	0xFD, 0x00, 0x01, 0x00, 0x38, 0x00, 0x01, 0x00
+};
+long long multi_texture_clipping_plane_vert_spv_size = 2056;
\ No newline at end of file
diff --git a/src/engine/renderer/shaders/spirv/single_texture_clipping_plane_vert.cpp b/src/engine/renderer/shaders/spirv/single_texture_clipping_plane_vert.cpp
new file mode 100644
index 0000000..169f9c0
--- /dev/null
+++ b/src/engine/renderer/shaders/spirv/single_texture_clipping_plane_vert.cpp
@@ -0,0 +1,123 @@
+unsigned char single_texture_clipping_plane_vert_spv[] = {
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+	0x20, 0x00, 0x04, 0x00, 0x20, 0x00, 0x00, 0x00, 0x09, 0x00, 0x00, 0x00, 0x1B, 0x00, 0x00, 0x00, 
+	0x20, 0x00, 0x04, 0x00, 0x25, 0x00, 0x00, 0x00, 0x03, 0x00, 0x00, 0x00, 0x07, 0x00, 0x00, 0x00, 
+	0x2B, 0x00, 0x04, 0x00, 0x19, 0x00, 0x00, 0x00, 0x27, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 
+	0x2B, 0x00, 0x04, 0x00, 0x19, 0x00, 0x00, 0x00, 0x28, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00, 
+	0x20, 0x00, 0x04, 0x00, 0x29, 0x00, 0x00, 0x00, 0x09, 0x00, 0x00, 0x00, 0x07, 0x00, 0x00, 0x00, 
+	0x20, 0x00, 0x04, 0x00, 0x2D, 0x00, 0x00, 0x00, 0x09, 0x00, 0x00, 0x00, 0x1C, 0x00, 0x00, 0x00, 
+	0x20, 0x00, 0x04, 0x00, 0x36, 0x00, 0x00, 0x00, 0x03, 0x00, 0x00, 0x00, 0x06, 0x00, 0x00, 0x00, 
+	0x3B, 0x00, 0x04, 0x00, 0x25, 0x00, 0x00, 0x00, 0x38, 0x00, 0x00, 0x00, 0x03, 0x00, 0x00, 0x00, 
+	0x20, 0x00, 0x04, 0x00, 0x39, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x07, 0x00, 0x00, 0x00, 
+	0x3B, 0x00, 0x04, 0x00, 0x39, 0x00, 0x00, 0x00, 0x3A, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 
+	0x17, 0x00, 0x04, 0x00, 0x3C, 0x00, 0x00, 0x00, 0x06, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00, 
+	0x20, 0x00, 0x04, 0x00, 0x3D, 0x00, 0x00, 0x00, 0x03, 0x00, 0x00, 0x00, 0x3C, 0x00, 0x00, 0x00, 
+	0x3B, 0x00, 0x04, 0x00, 0x3D, 0x00, 0x00, 0x00, 0x3E, 0x00, 0x00, 0x00, 0x03, 0x00, 0x00, 0x00, 
+	0x20, 0x00, 0x04, 0x00, 0x3F, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x3C, 0x00, 0x00, 0x00, 
+	0x3B, 0x00, 0x04, 0x00, 0x3F, 0x00, 0x00, 0x00, 0x40, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 
+	0x36, 0x00, 0x05, 0x00, 0x02, 0x00, 0x00, 0x00, 0x04, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
+	0x03, 0x00, 0x00, 0x00, 0xF8, 0x00, 0x02, 0x00, 0x05, 0x00, 0x00, 0x00, 0x3B, 0x00, 0x04, 0x00, 
+	0x08, 0x00, 0x00, 0x00, 0x09, 0x00, 0x00, 0x00, 0x07, 0x00, 0x00, 0x00, 0x3D, 0x00, 0x04, 0x00, 
+	0x0A, 0x00, 0x00, 0x00, 0x0D, 0x00, 0x00, 0x00, 0x0C, 0x00, 0x00, 0x00, 0x51, 0x00, 0x05, 0x00, 
+	0x06, 0x00, 0x00, 0x00, 0x0F, 0x00, 0x00, 0x00, 0x0D, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
+	0x51, 0x00, 0x05, 0x00, 0x06, 0x00, 0x00, 0x00, 0x10, 0x00, 0x00, 0x00, 0x0D, 0x00, 0x00, 0x00, 
+	0x01, 0x00, 0x00, 0x00, 0x51, 0x00, 0x05, 0x00, 0x06, 0x00, 0x00, 0x00, 0x11, 0x00, 0x00, 0x00, 
+	0x0D, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00, 0x50, 0x00, 0x07, 0x00, 0x07, 0x00, 0x00, 0x00, 
+	0x12, 0x00, 0x00, 0x00, 0x0F, 0x00, 0x00, 0x00, 0x10, 0x00, 0x00, 0x00, 0x11, 0x00, 0x00, 0x00, 
+	0x0E, 0x00, 0x00, 0x00, 0x3E, 0x00, 0x03, 0x00, 0x09, 0x00, 0x00, 0x00, 0x12, 0x00, 0x00, 0x00, 
+	0x41, 0x00, 0x05, 0x00, 0x20, 0x00, 0x00, 0x00, 0x21, 0x00, 0x00, 0x00, 0x1F, 0x00, 0x00, 0x00, 
+	0x1A, 0x00, 0x00, 0x00, 0x3D, 0x00, 0x04, 0x00, 0x1B, 0x00, 0x00, 0x00, 0x22, 0x00, 0x00, 0x00, 
+	0x21, 0x00, 0x00, 0x00, 0x3D, 0x00, 0x04, 0x00, 0x07, 0x00, 0x00, 0x00, 0x23, 0x00, 0x00, 0x00, 
+	0x09, 0x00, 0x00, 0x00, 0x91, 0x00, 0x05, 0x00, 0x07, 0x00, 0x00, 0x00, 0x24, 0x00, 0x00, 0x00, 
+	0x22, 0x00, 0x00, 0x00, 0x23, 0x00, 0x00, 0x00, 0x41, 0x00, 0x05, 0x00, 0x25, 0x00, 0x00, 0x00, 
+	0x26, 0x00, 0x00, 0x00, 0x18, 0x00, 0x00, 0x00, 0x1A, 0x00, 0x00, 0x00, 0x3E, 0x00, 0x03, 0x00, 
+	0x26, 0x00, 0x00, 0x00, 0x24, 0x00, 0x00, 0x00, 0x41, 0x00, 0x05, 0x00, 0x29, 0x00, 0x00, 0x00, 
+	0x2A, 0x00, 0x00, 0x00, 0x1F, 0x00, 0x00, 0x00, 0x28, 0x00, 0x00, 0x00, 0x3D, 0x00, 0x04, 0x00, 
+	0x07, 0x00, 0x00, 0x00, 0x2B, 0x00, 0x00, 0x00, 0x2A, 0x00, 0x00, 0x00, 0x3D, 0x00, 0x04, 0x00, 
+	0x07, 0x00, 0x00, 0x00, 0x2C, 0x00, 0x00, 0x00, 0x09, 0x00, 0x00, 0x00, 0x41, 0x00, 0x05, 0x00, 
+	0x2D, 0x00, 0x00, 0x00, 0x2E, 0x00, 0x00, 0x00, 0x1F, 0x00, 0x00, 0x00, 0x27, 0x00, 0x00, 0x00, 
+	0x3D, 0x00, 0x04, 0x00, 0x1C, 0x00, 0x00, 0x00, 0x2F, 0x00, 0x00, 0x00, 0x2E, 0x00, 0x00, 0x00, 
+	0x90, 0x00, 0x05, 0x00, 0x0A, 0x00, 0x00, 0x00, 0x30, 0x00, 0x00, 0x00, 0x2C, 0x00, 0x00, 0x00, 
+	0x2F, 0x00, 0x00, 0x00, 0x51, 0x00, 0x05, 0x00, 0x06, 0x00, 0x00, 0x00, 0x31, 0x00, 0x00, 0x00, 
+	0x30, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x51, 0x00, 0x05, 0x00, 0x06, 0x00, 0x00, 0x00, 
+	0x32, 0x00, 0x00, 0x00, 0x30, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x51, 0x00, 0x05, 0x00, 
+	0x06, 0x00, 0x00, 0x00, 0x33, 0x00, 0x00, 0x00, 0x30, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00, 
+	0x50, 0x00, 0x07, 0x00, 0x07, 0x00, 0x00, 0x00, 0x34, 0x00, 0x00, 0x00, 0x31, 0x00, 0x00, 0x00, 
+	0x32, 0x00, 0x00, 0x00, 0x33, 0x00, 0x00, 0x00, 0x0E, 0x00, 0x00, 0x00, 0x94, 0x00, 0x05, 0x00, 
+	0x06, 0x00, 0x00, 0x00, 0x35, 0x00, 0x00, 0x00, 0x2B, 0x00, 0x00, 0x00, 0x34, 0x00, 0x00, 0x00, 
+	0x41, 0x00, 0x06, 0x00, 0x36, 0x00, 0x00, 0x00, 0x37, 0x00, 0x00, 0x00, 0x18, 0x00, 0x00, 0x00, 
+	0x27, 0x00, 0x00, 0x00, 0x1A, 0x00, 0x00, 0x00, 0x3E, 0x00, 0x03, 0x00, 0x37, 0x00, 0x00, 0x00, 
+	0x35, 0x00, 0x00, 0x00, 0x3D, 0x00, 0x04, 0x00, 0x07, 0x00, 0x00, 0x00, 0x3B, 0x00, 0x00, 0x00, 
+	0x3A, 0x00, 0x00, 0x00, 0x3E, 0x00, 0x03, 0x00, 0x38, 0x00, 0x00, 0x00, 0x3B, 0x00, 0x00, 0x00, 
+	0x3D, 0x00, 0x04, 0x00, 0x3C, 0x00, 0x00, 0x00, 0x41, 0x00, 0x00, 0x00, 0x40, 0x00, 0x00, 0x00, 
+	0x3E, 0x00, 0x03, 0x00, 0x3E, 0x00, 0x00, 0x00, 0x41, 0x00, 0x00, 0x00, 0xFD, 0x00, 0x01, 0x00, 
+	0x38, 0x00, 0x01, 0x00
+};
+long long single_texture_clipping_plane_vert_spv_size = 1908;
\ No newline at end of file
diff --git a/src/engine/renderer/tr_local.h b/src/engine/renderer/tr_local.h
index 93da3b0..16e9590 100644
--- a/src/engine/renderer/tr_local.h
+++ b/src/engine/renderer/tr_local.h
@@ -320,7 +320,8 @@ typedef struct {
 
     // VULKAN
     VkPipeline      vk_pipeline = VK_NULL_HANDLE;
-
+    VkPipeline      vk_portal_pipeline = VK_NULL_HANDLE;
+    VkPipeline      vk_mirror_pipeline = VK_NULL_HANDLE;
 } shaderStage_t;
 
 struct shaderCommands_s;
diff --git a/src/engine/renderer/tr_shade.c b/src/engine/renderer/tr_shade.c
index 9763078..537fc39 100644
--- a/src/engine/renderer/tr_shade.c
+++ b/src/engine/renderer/tr_shade.c
@@ -842,7 +842,13 @@ static void RB_IterateStagesGeneric( shaderCommands_t *input )
 		}
 
         // VULKAN
-        vk_bind_stage_specific_resources(pStage->vk_pipeline, multitexture, input->shader->isSky == qtrue);
+        VkPipeline pipeline = pStage->vk_pipeline;
+        if (backEnd.viewParms.isMirror)
+            pipeline = pStage->vk_mirror_pipeline;
+        else if (backEnd.viewParms.isPortal)
+            pipeline = pStage->vk_portal_pipeline;
+
+        vk_bind_stage_specific_resources(pipeline, multitexture, input->shader->isSky == qtrue);
         vkCmdDrawIndexed(vk.command_buffer, tess.numIndexes, 1, 0, 0, 0);
         glState.vk_dirty_attachments = true;
 
diff --git a/src/engine/renderer/tr_shader.c b/src/engine/renderer/tr_shader.c
index 978cf34..e235199 100644
--- a/src/engine/renderer/tr_shader.c
+++ b/src/engine/renderer/tr_shader.c
@@ -2178,7 +2178,17 @@ static shader_t *FinishShader( void ) {
         else
             ri.Error(ERR_DROP, "ERROR: could not determine vulkan shader type for shader '%s'\n", shader.name);
 
+        def.clipping_plane = false;
+        def.mirror = false;
         pStage->vk_pipeline = vk_find_pipeline(def);
+
+        def.clipping_plane = true;
+        def.mirror = false;
+        pStage->vk_portal_pipeline = vk_find_pipeline(def);
+
+        def.clipping_plane = true;
+        def.mirror = true;
+        pStage->vk_mirror_pipeline = vk_find_pipeline(def);
     }
 
 	return GeneratePermanentShader();
diff --git a/src/engine/renderer/vk.cpp b/src/engine/renderer/vk.cpp
index e36d2a6..5823532 100644
--- a/src/engine/renderer/vk.cpp
+++ b/src/engine/renderer/vk.cpp
@@ -166,6 +166,10 @@ static VkDevice create_device(VkPhysicalDevice physical_device, uint32_t queue_f
     queue_desc.queueCount = 1;
     queue_desc.pQueuePriorities = &priority;
 
+    VkPhysicalDeviceFeatures features;
+    Com_Memset(&features, 0, sizeof(features));
+    features.shaderClipDistance = VK_TRUE;
+
     VkDeviceCreateInfo device_desc;
     device_desc.sType = VK_STRUCTURE_TYPE_DEVICE_CREATE_INFO;
     device_desc.pNext = nullptr;
@@ -176,7 +180,7 @@ static VkDevice create_device(VkPhysicalDevice physical_device, uint32_t queue_f
     device_desc.ppEnabledLayerNames = nullptr;
     device_desc.enabledExtensionCount = static_cast<uint32_t>(device_extensions.size());
     device_desc.ppEnabledExtensionNames = device_extensions.data();
-    device_desc.pEnabledFeatures = nullptr;
+    device_desc.pEnabledFeatures = &features;
 
     VkDevice device;
     VK_CHECK(vkCreateDevice(physical_device, &device_desc, nullptr, &device));
@@ -516,6 +520,12 @@ void vk_create_instance(HWND hwnd) {
 
     vk.instance = create_instance();
     vk.physical_device = select_physical_device(vk.instance);
+
+    VkPhysicalDeviceFeatures features;
+    vkGetPhysicalDeviceFeatures(vk.physical_device, &features);
+    if (features.shaderClipDistance == VK_FALSE)
+        ri.Error(ERR_FATAL, "vk_create_instance: shaderClipDistance feature is not supported");
+
     vk.surface = create_surface(vk.instance, hwnd);
     vk.surface_format = select_surface_format(vk.physical_device, vk.surface);
 
@@ -721,7 +731,7 @@ void vk_create_instance(HWND hwnd) {
         VkPushConstantRange push_range;
         push_range.stageFlags = VK_SHADER_STAGE_VERTEX_BIT;
         push_range.offset = 0;
-        push_range.size = 64; // sizeof(float[16])
+        push_range.size = 128; // 32 floats
 
         VkDescriptorSetLayout set_layouts[2] = {vk.set_layout, vk.set_layout};
 
@@ -828,6 +838,10 @@ void vk_create_instance(HWND hwnd) {
         extern long long single_texture_vert_spv_size;
         vk.single_texture_vs = create_shader_module(single_texture_vert_spv, single_texture_vert_spv_size);
 
+        extern unsigned char single_texture_clipping_plane_vert_spv[];
+        extern long long single_texture_clipping_plane_vert_spv_size;
+        vk.single_texture_clipping_plane_vs = create_shader_module(single_texture_clipping_plane_vert_spv, single_texture_clipping_plane_vert_spv_size);
+
         extern unsigned char single_texture_frag_spv[];
         extern long long single_texture_frag_spv_size;
         vk.single_texture_fs = create_shader_module(single_texture_frag_spv, single_texture_frag_spv_size);
@@ -836,6 +850,10 @@ void vk_create_instance(HWND hwnd) {
         extern long long multi_texture_vert_spv_size;
         vk.multi_texture_vs = create_shader_module(multi_texture_vert_spv, multi_texture_vert_spv_size);
 
+        extern unsigned char multi_texture_clipping_plane_vert_spv[];
+        extern long long multi_texture_clipping_plane_vert_spv_size;
+        vk.multi_texture_clipping_plane_vs = create_shader_module(multi_texture_clipping_plane_vert_spv, multi_texture_clipping_plane_vert_spv_size);
+
         extern unsigned char multi_texture_mul_frag_spv[];
         extern long long multi_texture_mul_frag_spv_size;
         vk.multi_texture_mul_fs = create_shader_module(multi_texture_mul_frag_spv, multi_texture_mul_frag_spv_size);
@@ -854,6 +872,8 @@ void vk_create_instance(HWND hwnd) {
         def.state_bits = 0;
         def.face_culling = CT_FRONT_SIDED;
         def.polygon_offset = false;
+        def.clipping_plane = false;
+        def.mirror = false;
 
         vk.skybox_pipeline = create_pipeline(def);
     }
@@ -888,8 +908,10 @@ void vk_destroy_instance() {
     vkDestroyFence(vk.device, vk.rendering_finished_fence, nullptr);
 
     vkDestroyShaderModule(vk.device, vk.single_texture_vs, nullptr);
+    vkDestroyShaderModule(vk.device, vk.single_texture_clipping_plane_vs, nullptr);
     vkDestroyShaderModule(vk.device, vk.single_texture_fs, nullptr);
     vkDestroyShaderModule(vk.device, vk.multi_texture_vs, nullptr);
+    vkDestroyShaderModule(vk.device, vk.multi_texture_clipping_plane_vs, nullptr);
     vkDestroyShaderModule(vk.device, vk.multi_texture_mul_fs, nullptr);
     vkDestroyShaderModule(vk.device, vk.multi_texture_add_fs, nullptr);
 
@@ -1155,13 +1177,13 @@ static VkPipeline create_pipeline(const Vk_Pipeline_Def& def) {
 
     VkShaderModule* vs_module, *fs_module;
     if (def.shader_type == Vk_Shader_Type::single_texture) {
-        vs_module = &vk.single_texture_vs;
+        vs_module = def.clipping_plane ? &vk.single_texture_clipping_plane_vs :  &vk.single_texture_vs;
         fs_module = &vk.single_texture_fs;
     } else if (def.shader_type == Vk_Shader_Type::multi_texture_mul) {
-        vs_module = &vk.multi_texture_vs;
+        vs_module = def.clipping_plane ? &vk.multi_texture_clipping_plane_vs : &vk.multi_texture_vs;
         fs_module = &vk.multi_texture_mul_fs;
     } else if (def.shader_type == Vk_Shader_Type::multi_texture_add) {
-        vs_module = &vk.multi_texture_vs;
+        vs_module = def.clipping_plane ? &vk.multi_texture_clipping_plane_vs : &vk.multi_texture_vs;
         fs_module = &vk.multi_texture_add_fs;
     }
     shader_stages_state.push_back(get_shader_stage_desc(VK_SHADER_STAGE_VERTEX_BIT, *vs_module, "main"));
@@ -1264,9 +1286,9 @@ static VkPipeline create_pipeline(const Vk_Pipeline_Def& def) {
     if (def.face_culling == CT_TWO_SIDED)
         rasterization_state.cullMode = VK_CULL_MODE_NONE;
     else if (def.face_culling == CT_FRONT_SIDED)
-        rasterization_state.cullMode = VK_CULL_MODE_BACK_BIT;
+        rasterization_state.cullMode = (def.mirror ? VK_CULL_MODE_FRONT_BIT : VK_CULL_MODE_BACK_BIT);
     else if (def.face_culling == CT_BACK_SIDED)
-        rasterization_state.cullMode = VK_CULL_MODE_FRONT_BIT;
+        rasterization_state.cullMode = (def.mirror ? VK_CULL_MODE_BACK_BIT : VK_CULL_MODE_FRONT_BIT);
     else
         ri.Error(ERR_DROP, "create_pipeline: invalid face culling mode\n");
 
@@ -1527,7 +1549,9 @@ VkPipeline vk_find_pipeline(const Vk_Pipeline_Def& def) {
         if (cur_def.shader_type == def.shader_type &&
             cur_def.state_bits == def.state_bits &&
             cur_def.face_culling == def.face_culling &&
-            cur_def.polygon_offset == def.polygon_offset)
+            cur_def.polygon_offset == def.polygon_offset &&
+            cur_def.clipping_plane == def.clipping_plane &&
+            cur_def.mirror == def.mirror)
         {
             return vk_resources.pipelines[i];
         }
@@ -1631,10 +1655,43 @@ void vk_bind_resources_shared_between_stages() {
     vkCmdBindIndexBuffer(vk.command_buffer, vk.index_buffer, vk.index_buffer_offset, VK_INDEX_TYPE_UINT32);
     vk.index_buffer_offset += indexes_size;
 
-    // update mvp transform
-    float mvp[16];
-    get_mvp_transform(mvp);
-    vkCmdPushConstants(vk.command_buffer, vk.pipeline_layout, VK_SHADER_STAGE_VERTEX_BIT, 0, 64, mvp);
+    // specify push constants
+    float push_constants[16 + 12 + 4]; // mvp transform + eye transform + clipping plane in eye space
+
+    get_mvp_transform(push_constants);
+    int push_constants_size = 64;
+
+    if (backEnd.viewParms.isPortal) {
+        // Eye space transform.
+        // NOTE: backEnd.or.modelMatrix incorporates s_flipMatrix, so it should be taken into account 
+        // when computing clipping plane too.
+        float* eye_xform = push_constants + 16;
+        for (int i = 0; i < 12; i++) {
+            eye_xform[i] = backEnd.or.modelMatrix[(i%4)*4 + i/4 ];
+        }
+
+        // Clipping plane in eye coordinates.
+        float world_plane[4];
+        world_plane[0] = backEnd.viewParms.portalPlane.normal[0];
+        world_plane[1] = backEnd.viewParms.portalPlane.normal[1];
+        world_plane[2] = backEnd.viewParms.portalPlane.normal[2];
+        world_plane[3] = backEnd.viewParms.portalPlane.dist;
+
+        float eye_plane[4];
+        eye_plane[0] = DotProduct (backEnd.viewParms.or.axis[0], world_plane);
+        eye_plane[1] = DotProduct (backEnd.viewParms.or.axis[1], world_plane);
+        eye_plane[2] = DotProduct (backEnd.viewParms.or.axis[2], world_plane);
+        eye_plane[3] = DotProduct (world_plane, backEnd.viewParms.or.origin) - world_plane[3];
+
+        // Apply s_flipMatrix to be in the same coordinate system as eye_xfrom.
+        push_constants[28] = -eye_plane[1];
+        push_constants[29] =  eye_plane[2];
+        push_constants[30] = -eye_plane[0];
+        push_constants[31] =  eye_plane[3];
+
+        push_constants_size += 64;
+    }
+    vkCmdPushConstants(vk.command_buffer, vk.pipeline_layout, VK_SHADER_STAGE_VERTEX_BIT, 0, push_constants_size, push_constants);
 }
 
 void vk_bind_stage_specific_resources(VkPipeline pipeline, bool multitexture, bool sky) {
diff --git a/src/engine/renderer/vk.h b/src/engine/renderer/vk.h
index 82528d5..d84b670 100644
--- a/src/engine/renderer/vk.h
+++ b/src/engine/renderer/vk.h
@@ -38,6 +38,8 @@ struct Vk_Pipeline_Def {
     unsigned int state_bits = 0; // GLS_XXX flags
     int face_culling = 0;// cullType_t
     bool polygon_offset = false;
+    bool clipping_plane = false;
+    bool mirror = false;
 };
 
 struct Vk_Image {
@@ -123,8 +125,10 @@ struct Vk_Instance {
     VkFence rendering_finished_fence = VK_NULL_HANDLE;
 
     VkShaderModule single_texture_vs = VK_NULL_HANDLE;
+    VkShaderModule single_texture_clipping_plane_vs = VK_NULL_HANDLE;
     VkShaderModule single_texture_fs = VK_NULL_HANDLE;
     VkShaderModule multi_texture_vs = VK_NULL_HANDLE;
+    VkShaderModule multi_texture_clipping_plane_vs = VK_NULL_HANDLE;
     VkShaderModule multi_texture_mul_fs = VK_NULL_HANDLE;
     VkShaderModule multi_texture_add_fs = VK_NULL_HANDLE;