void OnRenderImage(RenderTexture src, RenderTexture dest)
{
if (!SystemInfo.supportsRayTracing || !rayTracingShader)
{
Debug.Log("The RayTracing API is not supported by this GPU or by the current graphics API.");
Graphics.Blit(src, dest);
return;
}
if (rayTracingAccelerationStructure == null)
{
return;
}
if (prevCameraMatrix != Camera.main.cameraToWorldMatrix)
{
convergenceStep = 0;
}
if (prevBounceCountOpaque != bounceCountOpaque)
{
convergenceStep = 0;
}
if (prevBounceCountTransparent != bounceCountTransparent)
{
convergenceStep = 0;
}
// Not really needed per frame if the scene is static.
rayTracingAccelerationStructure.Build();
rayTracingShader.SetShaderPass("PathTracing");
Shader.SetGlobalInt(Shader.PropertyToID("g_BounceCountOpaque"), (int)bounceCountOpaque);
Shader.SetGlobalInt(Shader.PropertyToID("g_BounceCountTransparent"), (int)bounceCountTransparent);
// Input
rayTracingShader.SetAccelerationStructure(Shader.PropertyToID("g_AccelStruct"), rayTracingAccelerationStructure);
rayTracingShader.SetFloat(Shader.PropertyToID("g_Zoom"), Mathf.Tan(Mathf.Deg2Rad * Camera.main.fieldOfView * 0.5f));
rayTracingShader.SetFloat(Shader.PropertyToID("g_AspectRatio"), cameraWidth / (float)cameraHeight);
rayTracingShader.SetInt(Shader.PropertyToID("g_ConvergenceStep"), convergenceStep);
rayTracingShader.SetInt(Shader.PropertyToID("g_FrameIndex"), Time.frameCount);
rayTracingShader.SetTexture(Shader.PropertyToID("g_EnvTex"), envTexture);
// Output
rayTracingShader.SetTexture(Shader.PropertyToID("g_Radiance"), rayTracingOutput);
rayTracingShader.Dispatch("MainRayGenShader", (int)cameraWidth, (int)cameraHeight, 1, Camera.main);
Graphics.Blit(rayTracingOutput, dest);
convergenceStep++;
prevCameraMatrix = Camera.main.cameraToWorldMatrix;
prevBounceCountOpaque = bounceCountOpaque;
prevBounceCountTransparent = bounceCountTransparent;
}
public void OnRenderImage(RenderTexture src, RenderTexture dest)
{
var cam = Camera.main;
if (!CheckResources(cam))
{
Graphics.Blit(src, dest);
return;
}
//-- shader pass "RTPass" in material shaders
rtShader.SetShaderPass("RTPass");
//- set global variables, used in all material shaders
Shader.SetGlobalVector(ShaderID._T_minmax, new Vector2(tMin, tMax));
//-- set local RT raygen shader variables
_rtAccStructure.Build();
rtShader.SetAccelerationStructure(ShaderID._SceneAccelerationStructure, _rtAccStructure);
rtShader.SetTexture(ShaderID._RenderTarget, _rtTargetTexture);
rtShader.SetMatrix(ShaderID._InvViewMatrix, cam.cameraToWorldMatrix);
rtShader.SetTexture(ShaderID._EnvironmentTex, environmentCubemap);
rtShader.SetFloat(ShaderID._EnvironmentGamma, Mathf.GammaToLinearSpace(environmentExposure));
rtShader.SetFloat(ShaderID._ShadowBrightness, shadowBrightness);
var camOrigin = cam.transform.position;
var frustumBottomLeftDirWS = (cam.ViewportToWorldPoint(new Vector3(0, 0, cam.nearClipPlane)) - camOrigin).normalized;
var frustumBottomRightDirWS = (cam.ViewportToWorldPoint(new Vector3(1, 0, cam.nearClipPlane)) - camOrigin).normalized;
var frustumTopLeftDirWS = (cam.ViewportToWorldPoint(new Vector3(0, 1, cam.nearClipPlane)) - camOrigin).normalized;
rtShader.SetVector(ShaderID._FrustumBottomLeftDirWS, frustumBottomLeftDirWS);
rtShader.SetVector(ShaderID._FrustumHorizDirWS, frustumBottomRightDirWS - frustumBottomLeftDirWS);
rtShader.SetVector(ShaderID._FrustumVertDirWS, frustumTopLeftDirWS - frustumBottomLeftDirWS);
//-- dispatch ray tracing
rtShader.Dispatch("RaygenShader", cam.pixelWidth, cam.pixelHeight, 1);
Graphics.Blit(_rtTargetTexture, dest);
}
void SetShaderProperties()
{
Vector3 bottomLeft = cam.ViewportToWorldPoint(new Vector3(0, 0, 100000)).normalized;
Vector3 topLeft = cam.ViewportToWorldPoint(new Vector3(0, 1, 100000)).normalized;
Vector3 bottomRight = cam.ViewportToWorldPoint(new Vector3(1, 0, 100000)).normalized;
Vector3 topRight = cam.ViewportToWorldPoint(new Vector3(1, 1, 100000)).normalized;
shader.SetVector("_TopLeftFrustumDir", topLeft);
shader.SetVector("_TopRightFrustumDir", topRight);
shader.SetVector("_BottomLeftFrustumDir", bottomLeft);
shader.SetVector("_BottomRightFrustumDir", bottomRight);
shader.SetVector("_Sun", sun.transform.forward);
shader.SetVector("_WSCP", transform.position);
shader.SetFloat("_RayLength", rayLength);
combine.SetTexture("_CS", cs);
shader.SetAccelerationStructure("_RTAS", _RTAS);
combine.SetColor("_Ambient", RenderSettings.ambientLight);
}
void DispatchRays()
{
// update frame index and start path tracer
_rayTracingShader.SetInt("_FrameIndex", _frameIndex);
_rayTracingShader.SetShaderPass("DxrPass"); //
// using e.g. ForwardDXR here will require binding all variables correctly, e.g. _EnvLightDatasRT
// _rayTracingShader.SetShaderPass("ForwardDXR");
// var lightCluster = HDRenderPipeline.currentPipeline.RequestLightCluster();
// Shader.SetGlobalBuffer(HDShaderIDs._RaytracingLightCluster, lightCluster.GetCluster());
// Shader.SetGlobalBuffer(HDShaderIDs._LightDatasRT, lightCluster.GetLightDatas());
// Shader.SetGlobalBuffer(HDShaderIDs._EnvLightDatasRT, lightCluster.GetEnvLightDatas());
_rayTracingShader.SetFloat("_JitterAmount", resultTexture == ResultTexture.DxrTarget ? 0 : 1);
_rayTracingShader.SetBool("_UseLensData", lensRenderer && lensRenderer.isActiveAndEnabled);
if (lensRenderer)
{
_rayTracingShader.SetMatrix("_DataProviderTransform", lensRenderer.transform.localToWorldMatrix);
_rayTracingShader.SetTexture("_PositionData", lensRenderer.lensPositionTex);
_rayTracingShader.SetTexture("_DirectionData", lensRenderer.lensDirectionTex);
}
else
{
_rayTracingShader.SetTexture("_PositionData", Texture2D.whiteTexture);
_rayTracingShader.SetTexture("_DirectionData", Texture2D.whiteTexture);
}
// start one thread for each pixel on screen
_rayTracingShader.Dispatch("MyRaygenShader", _dxrTarget.width, _dxrTarget.height, 1, _camera);
// update accumulation material
_accumulationMaterial.SetTexture("_CurrentFrame", _dxrTarget);
_accumulationMaterial.SetTexture("_Accumulation", _accumulationTarget1);
_accumulationMaterial.SetInt("_FrameIndex", _frameIndex++);
// accumulate current raytracing result
Graphics.Blit(_dxrTarget, _accumulationTarget2, _accumulationMaterial);
// switch accumulate textures
var temp = _accumulationTarget1;
_accumulationTarget1 = _accumulationTarget2;
_accumulationTarget2 = temp;
// // apply DLSS to the _dxrTarget
// var cmd = new CommandBuffer();
// var initData = new DLSSCommandInitializationData()
// {
// featureFlags = DLSSFeatureFlags.DoSharpening,
// inputRTHeight = (uint)_dxrTarget.height,
// inputRTWidth = (uint)_dxrTarget.width,
// outputRTWidth = (uint)(2 * _dxrTarget.width),
// outputRTHeight = (uint)(2 * _dxrTarget.height),
// quality = DLSSQuality.MaximumPerformance
// };
//
// var context = _nvidiaDevice.CreateFeature(cmd, initData);
// var textureTable = new DLSSTextureTable()
// {
// colorInput = _dxrTarget,
// colorOutput = null,
// depth = null,
// motionVectors = null,
// };
// _nvidiaDevice.ExecuteDLSS(cmd, context, new DLSSTextureTable());
GetComponent <MeshRenderer>().sharedMaterial.mainTexture = resultTexture == ResultTexture.DxrTarget ? _dxrTarget : _accumulationTarget1;
}