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using System;
using System.Collections.Generic;
using UnityEngine.Rendering;
using UnityEngine.Rendering.PostProcessing;
namespace UnityEngine.Experimental.Rendering.HDPipeline
{
// This holds all the matrix data we need for rendering, including data from the previous frame
// (which is the main reason why we need to keep them around for a minimum of one frame).
// HDCameras are automatically created & updated from a source camera and will be destroyed if
// not used during a frame.
public class HDCamera
{
public Matrix4x4 viewMatrix;
public Matrix4x4 projMatrix;
public Matrix4x4 nonJitteredProjMatrix;
public Vector4 screenSize;
public Vector4[] frustumPlaneEquations;
public Camera camera;
public Matrix4x4 viewProjMatrix
{
get { return projMatrix * viewMatrix; }
}
public Matrix4x4 nonJitteredViewProjMatrix
{
get { return nonJitteredProjMatrix * viewMatrix; }
}
public bool isFirstFrame
{
get { return m_FirstFrame; }
}
public Vector4 invProjParam
{
// Ref: An Efficient Depth Linearization Method for Oblique View Frustums, Eq. 6.
get { var p = projMatrix; return new Vector4(p.m20 / (p.m00 * p.m23), p.m21 / (p.m11 * p.m23), -1.0f / p.m23, (-p.m22 + p.m20 * p.m02 / p.m00 + p.m21 * p.m12 / p.m11) / p.m23); }
}
// View-projection matrix from the previous frame.
public Matrix4x4 prevViewProjMatrix;
// We need to keep track of these when camera relative rendering is enabled so we can take
// camera translation into account when generating camera motion vectors
public Vector3 cameraPos;
public Vector3 prevCameraPos;
// The only way to reliably keep track of a frame change right now is to compare the frame
// count Unity gives us. We need this as a single camera could be rendered several times per
// frame and some matrices only have to be computed once. Realistically this shouldn't
// happen, but you never know...
int m_LastFrameActive;
// Always true for cameras that just got added to the pool - needed for previous matrices to
// avoid one-frame jumps/hiccups with temporal effects (motion blur, TAA...)
bool m_FirstFrame;
public HDCamera(Camera cam)
{
camera = cam;
frustumPlaneEquations = new Vector4[6];
Reset();
}
public void Update(PostProcessLayer postProcessLayer)
{
// If TAA is enabled projMatrix will hold a jittered projection matrix. The original,
// non-jittered projection matrix can be accessed via nonJitteredProjMatrix.
bool taaEnabled = camera.cameraType == CameraType.Game
&& CoreUtils.IsTemporalAntialiasingActive(postProcessLayer);
Matrix4x4 nonJitteredCameraProj = camera.projectionMatrix;
Matrix4x4 cameraProj = taaEnabled
? postProcessLayer.temporalAntialiasing.GetJitteredProjectionMatrix(camera)
: nonJitteredCameraProj;
// The actual projection matrix used in shaders is actually massaged a bit to work across all platforms
// (different Z value ranges etc.)
Matrix4x4 gpuProj = GL.GetGPUProjectionMatrix(cameraProj, true); // Had to change this from 'false'
Matrix4x4 gpuView = camera.worldToCameraMatrix;
Matrix4x4 gpuNonJitteredProj = GL.GetGPUProjectionMatrix(nonJitteredCameraProj, true);
Vector3 pos = camera.transform.position;
if (ShaderConfig.s_CameraRelativeRendering != 0)
{
// Zero out the translation component.
gpuView.SetColumn(3, new Vector4(0, 0, 0, 1));
}
Matrix4x4 gpuVP = gpuNonJitteredProj * gpuView;
// A camera could be rendered multiple times per frame, only updates the previous view proj & pos if needed
if (m_LastFrameActive != Time.frameCount)
{
if (m_FirstFrame)
{
prevCameraPos = pos;
prevViewProjMatrix = gpuVP;
}
else
{
prevCameraPos = cameraPos;
prevViewProjMatrix = nonJitteredViewProjMatrix;
}
m_FirstFrame = false;
}
viewMatrix = gpuView;
projMatrix = gpuProj;
nonJitteredProjMatrix = gpuNonJitteredProj;
cameraPos = pos;
screenSize = new Vector4(camera.pixelWidth, camera.pixelHeight, 1.0f / camera.pixelWidth, 1.0f / camera.pixelHeight);
Plane[] planes = GeometryUtility.CalculateFrustumPlanes(viewProjMatrix);
for (int i = 0; i < 6; i++)
{
frustumPlaneEquations[i] = new Vector4(planes[i].normal.x, planes[i].normal.y, planes[i].normal.z, planes[i].distance);
}
m_LastFrameActive = Time.frameCount;
}
public void Reset()
{
m_LastFrameActive = -1;
m_FirstFrame = true;
}
static Dictionary<Camera, HDCamera> m_Cameras = new Dictionary<Camera, HDCamera>();
static List<Camera> m_Cleanup = new List<Camera>(); // Recycled to reduce GC pressure
// Grab the HDCamera tied to a given Camera and update it.
public static HDCamera Get(Camera camera, PostProcessLayer postProcessLayer)
{
HDCamera hdcam;
if (!m_Cameras.TryGetValue(camera, out hdcam))
{
hdcam = new HDCamera(camera);
m_Cameras.Add(camera, hdcam);
}
hdcam.Update(postProcessLayer);
return hdcam;
}
// Look for any camera that hasn't been used in the last frame and remove them for the pool.
public static void CleanUnused()
{
int frameCheck = Time.frameCount - 1;
foreach (var kvp in m_Cameras)
{
if (kvp.Value.m_LastFrameActive != frameCheck)
m_Cleanup.Add(kvp.Key);
}
foreach (var cam in m_Cleanup)
m_Cameras.Remove(cam);
m_Cleanup.Clear();
}
public void SetupGlobalParams(CommandBuffer cmd)
{
cmd.SetGlobalMatrix(HDShaderIDs._ViewMatrix, viewMatrix);
cmd.SetGlobalMatrix(HDShaderIDs._InvViewMatrix, viewMatrix.inverse);
cmd.SetGlobalMatrix(HDShaderIDs._ProjMatrix, projMatrix);
cmd.SetGlobalMatrix(HDShaderIDs._InvProjMatrix, projMatrix.inverse);
cmd.SetGlobalMatrix(HDShaderIDs._NonJitteredViewProjMatrix, nonJitteredViewProjMatrix);
cmd.SetGlobalMatrix(HDShaderIDs._ViewProjMatrix, viewProjMatrix);
cmd.SetGlobalMatrix(HDShaderIDs._InvViewProjMatrix, viewProjMatrix.inverse);
cmd.SetGlobalVector(HDShaderIDs._InvProjParam, invProjParam);
cmd.SetGlobalVector(HDShaderIDs._ScreenSize, screenSize);
cmd.SetGlobalMatrix(HDShaderIDs._PrevViewProjMatrix, prevViewProjMatrix);
cmd.SetGlobalVectorArray(HDShaderIDs._FrustumPlanes, frustumPlaneEquations);
}
// Does not modify global settings. Used for shadows, low res. rendering, etc.
public void OverrideGlobalParams(Material material)
{
material.SetMatrix(HDShaderIDs._ViewMatrix, viewMatrix);
material.SetMatrix(HDShaderIDs._InvViewMatrix, viewMatrix.inverse);
material.SetMatrix(HDShaderIDs._ProjMatrix, projMatrix);
material.SetMatrix(HDShaderIDs._InvProjMatrix, projMatrix.inverse);
material.SetMatrix(HDShaderIDs._NonJitteredViewProjMatrix, nonJitteredViewProjMatrix);
material.SetMatrix(HDShaderIDs._ViewProjMatrix, viewProjMatrix);
material.SetMatrix(HDShaderIDs._InvViewProjMatrix, viewProjMatrix.inverse);
material.SetVector(HDShaderIDs._InvProjParam, invProjParam);
material.SetVector(HDShaderIDs._ScreenSize, screenSize);
material.SetMatrix(HDShaderIDs._PrevViewProjMatrix, prevViewProjMatrix);
material.SetVectorArray(HDShaderIDs._FrustumPlanes, frustumPlaneEquations);
}
public void SetupComputeShader(ComputeShader cs, CommandBuffer cmd)
{
cmd.SetComputeMatrixParam(cs, HDShaderIDs._ViewMatrix, viewMatrix);
cmd.SetComputeMatrixParam(cs, HDShaderIDs._InvViewMatrix, viewMatrix.inverse);
cmd.SetComputeMatrixParam(cs, HDShaderIDs._ProjMatrix, projMatrix);
cmd.SetComputeMatrixParam(cs, HDShaderIDs._InvProjMatrix, projMatrix.inverse);
cmd.SetComputeMatrixParam(cs, HDShaderIDs._NonJitteredViewProjMatrix, nonJitteredViewProjMatrix);
cmd.SetComputeMatrixParam(cs, HDShaderIDs._ViewProjMatrix, viewProjMatrix);
cmd.SetComputeMatrixParam(cs, HDShaderIDs._InvViewProjMatrix, viewProjMatrix.inverse);
cmd.SetComputeVectorParam(cs, HDShaderIDs._InvProjParam, invProjParam);
cmd.SetComputeVectorParam(cs, HDShaderIDs._ScreenSize, screenSize);
cmd.SetComputeMatrixParam(cs, HDShaderIDs._PrevViewProjMatrix, prevViewProjMatrix);
cmd.SetComputeVectorArrayParam(cs, HDShaderIDs._FrustumPlanes, frustumPlaneEquations);
// Copy values set by Unity which are not configured in scripts.
cmd.SetComputeVectorParam(cs, HDShaderIDs.unity_OrthoParams, Shader.GetGlobalVector(HDShaderIDs.unity_OrthoParams));
cmd.SetComputeVectorParam(cs, HDShaderIDs._ProjectionParams, Shader.GetGlobalVector(HDShaderIDs._ProjectionParams));
cmd.SetComputeVectorParam(cs, HDShaderIDs._ScreenParams, Shader.GetGlobalVector(HDShaderIDs._ScreenParams));
cmd.SetComputeVectorParam(cs, HDShaderIDs._ZBufferParams, Shader.GetGlobalVector(HDShaderIDs._ZBufferParams));
cmd.SetComputeVectorParam(cs, HDShaderIDs._WorldSpaceCameraPos, Shader.GetGlobalVector(HDShaderIDs._WorldSpaceCameraPos));
}
}
}