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render stencil portals (stereo)

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This commit is contained in:
milan
2023-03-15 13:47:11 +01:00
parent 52fa079fce
commit c024ddfe5e
11 changed files with 578 additions and 643 deletions
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20
Assets/Desert/Assets/Prefabs/Desert XR Origin.prefab
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@@ -68,6 +68,16 @@ PrefabInstance:
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140
Assets/Portal/Assets/Materials/Portal.mat
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8
Assets/Portal/Assets/Materials/Portal.mat.meta
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68
Assets/Portal/Assets/Materials/PortalShader.shader
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@@ -1,68 +0,0 @@
Shader "Escape Room Engine/Portal"
{
Properties
{
_LeftTex("Left Eye Texture", 2D) = "" {}
_RightTex("Right Eye Texture", 2D) = "" {}
}
SubShader
{
Tags { "RenderType" = "Opaque" "RenderPipeline" = "UniversalPipeline" }
Pass
{
// stencil the portal surface to cut it out from the portal frame
Stencil
{
Ref 1
Pass replace
}
HLSLPROGRAM
#pragma vertex vert
#pragma fragment frag
#pragma multi_compile_instancing
#include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Core.hlsl"
struct Attributes
{
float4 positionOS : POSITION;
UNITY_VERTEX_INPUT_INSTANCE_ID
};
struct Varyings
{
float4 positionHCS : SV_POSITION;
float4 positionScreen : TEXCOORD0;
UNITY_VERTEX_OUTPUT_STEREO
};
uniform sampler2D _LeftTex, _RightTex;
Varyings vert(Attributes IN)
{
Varyings OUT;
UNITY_SETUP_INSTANCE_ID(IN);
UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(OUT);
OUT.positionHCS = TransformObjectToHClip(IN.positionOS.xyz);
// calculate the screen position which is used to map the portal texture onto the portal
OUT.positionScreen = ComputeScreenPos(OUT.positionHCS);
return OUT;
}
half4 frag(Varyings IN) : SV_Target
{
UNITY_SETUP_STEREO_EYE_INDEX_POST_VERTEX(IN);
const float2 uv = IN.positionScreen.xy / IN.positionScreen.w;
// sample from the correct texture depending on the eye rendered
return unity_StereoEyeIndex == 0 ? tex2D(_LeftTex, uv) : tex2D(_RightTex, uv);
}
ENDHLSL
}
}
}

10
Assets/Portal/Assets/Materials/PortalShader.shader.meta
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1
Assets/Portal/Runtime/Portal.asmdef
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@@ -4,6 +4,7 @@
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25
Assets/Portal/Runtime/Portal.cs
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@@ -2,6 +2,7 @@ using System;
using System.Collections.Generic;
using EscapeRoomEngine.Engine.Runtime.Modules;
using EscapeRoomEngine.Engine.Runtime.Utilities;
using EscapeRoomEngine.VR.Runtime;
using NaughtyAttributes;
using UnityEngine;
@@ -87,12 +88,28 @@ namespace EscapeRoomEngine.Portal.Runtime
}
}
public Camera SetUpCamera(Camera playerCamera)
public Camera SetUpCamera(Camera playerCamera, Camera.MonoOrStereoscopicEye monoOrEye)
{
// place camera
var m = portalTransform.localToWorldMatrix * HalfRotation *
linkedPortal.portalTransform.worldToLocalMatrix * playerCamera.transform.localToWorldMatrix;
playerCamera.transform.SetPositionAndRotation(m.GetPosition(), m.rotation);
Matrix4x4 cameraTransform;
if (monoOrEye == Camera.MonoOrStereoscopicEye.Mono)
{
cameraTransform = portalTransform.localToWorldMatrix * HalfRotation *
linkedPortal.portalTransform.worldToLocalMatrix *
playerCamera.transform.localToWorldMatrix;
}
else
{
// stereoRenderCounter = (stereoRenderCounter + 1) % 2;
var eye = monoOrEye == Camera.MonoOrStereoscopicEye.Left
? Camera.StereoscopicEye.Left
: Camera.StereoscopicEye.Right;
cameraTransform = portalTransform.localToWorldMatrix * HalfRotation *
linkedPortal.portalTransform.worldToLocalMatrix *
Player.Instance.GetEye(eye).localToWorldMatrix;
playerCamera.projectionMatrix = playerCamera.GetStereoProjectionMatrix(eye);
}
playerCamera.transform.SetPositionAndRotation(cameraTransform.GetPosition(), cameraTransform.rotation);
// set camera clip plane to portal (otherwise the wall behind the portal would be rendered)
// calculating the clip plane: https://computergraphics.stackexchange.com/a/1506

15
Assets/Portal/Runtime/RenderPortalCameras.cs
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@@ -16,9 +16,9 @@ namespace EscapeRoomEngine.Portal.Runtime
private class PortalCameraRenderPass : ScriptableRenderPass
{
private static readonly List<ShaderTagId> ShaderTagIds = new List<ShaderTagId>
private static readonly List<ShaderTagId> ShaderTagIds = new()
{
new("SRPDefaultUnlit"), new("UniversalForward"), new("UniversalForwardOnly")
new ShaderTagId("SRPDefaultUnlit"), new ShaderTagId("UniversalForward"), new ShaderTagId("UniversalForwardOnly")
};
private RenderStateBlock _renderStateBlock;
@@ -74,8 +74,15 @@ namespace EscapeRoomEngine.Portal.Runtime
var originalPosition = cameraTransform.position;
var originalRotation = cameraTransform.rotation;
var originalProjection = camera.projectionMatrix;
camera = linkedPortal.SetUpCamera(camera);
RenderingUtils.SetViewAndProjectionMatrices(_commandBuffer, camera.worldToCameraMatrix, GL.GetGPUProjectionMatrix(camera.projectionMatrix, true), false);
camera = linkedPortal.SetUpCamera(camera,
camera.stereoEnabled
? cameraData.xr.multipassId == 0
? Camera.MonoOrStereoscopicEye.Left
: Camera.MonoOrStereoscopicEye.Right
: Camera.MonoOrStereoscopicEye.Mono);
RenderingUtils.SetViewAndProjectionMatrices(_commandBuffer,
camera.worldToCameraMatrix,
GL.GetGPUProjectionMatrix(camera.projectionMatrix, true), false);
// execute command buffer
context.ExecuteCommandBuffer(_commandBuffer);

931
Assets/Scenes/StencilPortalScene.unity
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File diff suppressed because it is too large Load Diff

2
Assets/XR/Settings/OpenXR Package Settings.asset
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1
Assets/XR/XRGeneralSettings.asset
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