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Copy pathPixelCamera.cs
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448 lines (383 loc) · 12 KB
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using System;
using UnityEngine;
namespace SubjectNerd.Utilities
{
[ExecuteInEditMode]
[RequireComponent(typeof(Camera))]
public class PixelCamera : MonoBehaviour
{
[Serializable]
protected class AdvancedSettings
{
[Tooltip("Material to draw output render with")]
public Material cameraMaterial;
[Tooltip("Stretches output display, for non square pixels")]
public Vector2 aspectStretch = Vector2.one;
[Tooltip("Scales down camera render size")]
public float downSample = 1;
[Tooltip("Z distance to draw as pixel perfect for perspective camera.")]
public float perspectiveZ = 10;
}
protected struct CamSettings
{
public int[] screenSize;
public Vector2 aspect;
public float zoomLevel;
public float pixelsPerUnit;
public float zDistance;
public float downsample;
public float fieldOfView;
public float farPlane;
public bool isOrtho;
public CamSettings(PixelCamera pixelCam, Camera cam)
{
screenSize = new[] {Screen.width, Screen.height};
this.aspect = pixelCam.AspectStretch;
this.zoomLevel = pixelCam.ZoomLevel;
this.pixelsPerUnit = pixelCam.pixelsPerUnit;
this.zDistance = pixelCam.PerspectiveZ;
this.downsample = pixelCam.DownSample;
this.fieldOfView = cam.fieldOfView;
this.isOrtho = cam.orthographic;
this.farPlane = cam.farClipPlane;
}
public bool Equals(CamSettings other)
{
bool equalScreen = other.screenSize[0] == screenSize[0] &&
other.screenSize[1] == screenSize[1];
bool equalAspect = other.aspect == aspect;
bool isEqual = other.isOrtho == isOrtho &&
equalScreen &&
equalAspect &&
Mathf.Approximately(other.zoomLevel, zoomLevel) &&
Mathf.Approximately(other.pixelsPerUnit, pixelsPerUnit) &&
Mathf.Approximately(other.downsample, downsample);
if (isEqual && isOrtho == false)
{
isEqual &= Mathf.Approximately(other.zDistance, zDistance) &&
Mathf.Approximately(other.fieldOfView, fieldOfView) &&
Mathf.Approximately(other.farPlane, farPlane);
}
return isEqual;
}
}
[SerializeField] protected Camera cam;
[SerializeField] protected float pixelsPerUnit = 100;
[SerializeField] protected float zoomLevel = 1f;
[Space]
[SerializeField] protected AdvancedSettings advancedSettings;
protected RenderTexture renderTexture;
protected GameObject falseCamGO;
protected Camera falseCam;
protected PixelCamDrawer camDraw;
protected Shader fallbackShader;
protected Material fallbackMaterial;
protected CamSettings lastSettings;
protected Vector2 quadOffset;
public Vector2 QuadMin { get; protected set; }
public Vector2 QuadMax { get; protected set; }
/// <summary>
/// Material to draw output render with
/// </summary>
public Material CameraMaterial
{
get
{
Material useMaterial = fallbackMaterial;
if (advancedSettings != null && advancedSettings.cameraMaterial != null)
useMaterial = advancedSettings.cameraMaterial;
return useMaterial;
}
set
{
if (advancedSettings.cameraMaterial != null)
advancedSettings.cameraMaterial.SetTexture("_MainTex", null);
advancedSettings.cameraMaterial = value;
if (advancedSettings.cameraMaterial == null) return;
if (renderTexture != null)
advancedSettings.cameraMaterial.SetTexture("_MainTex", renderTexture);
}
}
public float ZoomLevel
{
get { return zoomLevel; }
set { zoomLevel = value; }
}
public float PixelsPerUnit
{
get { return pixelsPerUnit; }
set { pixelsPerUnit = value; }
}
/// <summary>
/// For perspective cameras. Z distance between near and far plane to scale as pixel perfect.
/// </summary>
public float PerspectiveZ
{
get
{
if (advancedSettings == null)
return cam.farClipPlane*0.5f;
advancedSettings.perspectiveZ = Mathf.Clamp(advancedSettings.perspectiveZ, cam.nearClipPlane, cam.farClipPlane);
return advancedSettings.perspectiveZ;
}
set
{
if (advancedSettings == null)
return;
advancedSettings.perspectiveZ = Mathf.Clamp(value, cam.nearClipPlane, cam.farClipPlane); ;
}
}
/// <summary>
/// Stretches output display, for non square pixels
/// </summary>
public Vector2 AspectStretch
{
get
{
if (advancedSettings == null)
return Vector2.one;
return advancedSettings.aspectStretch;
}
set
{
if (advancedSettings == null)
return;
advancedSettings.aspectStretch = value;
}
}
/// <summary>
/// Scales down camera render size. Clamped at minimum value of 1.
/// </summary>
public float DownSample
{
get
{
if (advancedSettings == null)
return 1f;
advancedSettings.downSample = Mathf.Max(1f, advancedSettings.downSample);
return advancedSettings.downSample;
}
set
{
if (advancedSettings == null)
return;
advancedSettings.downSample = Mathf.Max(1f, value);
}
}
/// <summary>
/// The render texture camera is being drawn into
/// </summary>
public RenderTexture RenderTexture { get { return renderTexture; } }
/// <summary>
/// Pixel size of the camera
/// </summary>
public int[] CameraSize
{
get
{
if (renderTexture == null)
return new[] {0, 0};
return new[] {renderTexture.width, renderTexture.height};
}
}
private void Reset()
{
cam = GetComponent<Camera>();
float cameraPixelHeight = Mathf.FloorToInt(cam.aspect*2*pixelsPerUnit);
zoomLevel = Screen.height/cameraPixelHeight;
}
private void Start()
{
// Disable if we don't support image effects
if (!SystemInfo.supportsImageEffects)
enabled = false;
if (cam == null)
cam = GetComponent<Camera>();
if (cam == null)
enabled = false;
OnDisable(); // Force cleanup
if (enabled)
OnEnable();
}
protected virtual void OnEnable()
{
lastSettings = new CamSettings(this, cam)
{
screenSize = new []{0, 0}
};
ForceRefresh();
falseCamGO = new GameObject("False Camera") {hideFlags = HideFlags.HideAndDontSave};
falseCam = falseCamGO.AddComponent<Camera>();
falseCam.cullingMask = LayerMask.GetMask();
camDraw = falseCamGO.AddComponent<PixelCamDrawer>();
camDraw.SourceCamera = this;
fallbackShader = Shader.Find("Hidden/SubjectNerd/PixelCamFallback");
if (fallbackShader != null)
{
fallbackMaterial = new Material(fallbackShader)
{
hideFlags = HideFlags.DontSave
};
}
else
{
Debug.Log("Couldn't find fall back shader, material not created");
enabled = false;
}
}
protected virtual void OnDisable()
{
if (fallbackMaterial != null)
DestroyImmediate(fallbackMaterial);
fallbackShader = null;
cam.targetTexture = null;
cam.ResetAspect();
if (renderTexture != null)
DestroyImmediate(renderTexture);
if (falseCamGO != null)
DestroyImmediate(falseCamGO);
falseCam = null;
}
private void SetupCamera(CamSettings settings)
{
var aspect = settings.aspect;
zoomLevel = Mathf.Max(0.05f, Mathf.Abs(zoomLevel))*Math.Sign(zoomLevel);
// "Physical" pixel render size
Vector2 screenRenderSize = GetScreenRenderSize();
// Pixel render size
int[] pixelRenderSize = GetRenderTextureSize(screenRenderSize, settings.aspect);
float targetAspect = (float)pixelRenderSize[0] / (float)pixelRenderSize[1];
cam.aspect = targetAspect;
if (cam.orthographic)
{
// Orthographic camera needs to use screen size when calculating quad offset
screenRenderSize = new Vector2(Screen.width, Screen.height);
// Set the camera's size, according to pixel size
float targetHeight = pixelRenderSize[1];
// Use pixel density to convert to world units
targetHeight /= pixelsPerUnit;
targetHeight /= 2f;
// Change orthographic size so camera is sized to world unit
cam.orthographicSize = targetHeight;
}
// Find the settings to be used for drawing the GL quad
CalculateQuad(screenRenderSize, pixelRenderSize);
// Important to release current render texture
cam.targetTexture = null;
fallbackMaterial.SetTexture("_MainTex", null);
if (advancedSettings != null && advancedSettings.cameraMaterial != null)
advancedSettings.cameraMaterial.SetTexture("_MainTex", null);
if (renderTexture != null)
renderTexture.Release();
// Create new render texture
Vector2 renderSize = new Vector2(pixelRenderSize[0], pixelRenderSize[1]) / settings.downsample;
int[] actualRenderSize = GetRenderTextureSize(renderSize, Vector2.one);
renderTexture = new RenderTexture(actualRenderSize[0], actualRenderSize[1], 0)
{
useMipMap = true,
filterMode = FilterMode.Point,
wrapMode = TextureWrapMode.Clamp
};
// Make main camera render into it
cam.targetTexture = renderTexture;
// Set render texture as _MainTex on materials
fallbackMaterial.SetTexture("_MainTex", renderTexture);
if (advancedSettings != null)
CameraMaterial = advancedSettings.cameraMaterial;
lastSettings = settings;
cam.Render();
camDraw.DrawQuad();
}
private float GetPerspectiveHeight(float z)
{
var frustumHeight = 2.0f * z * Mathf.Tan(cam.fieldOfView * 0.5f * Mathf.Deg2Rad);
return frustumHeight;
}
protected Vector2 GetScreenRenderSize()
{
// For orthographic camera, physical render size is based on screen pixels
Vector2 screenRenderSize = new Vector2(Screen.width, Screen.height);
screenRenderSize /= zoomLevel;
// For perspective camera, physical render is based on world unit height
// in terms of fustrum distance, converted to pixels
if (cam.orthographic == false)
{
cam.aspect = (float) Screen.width / Screen.height;
float scale = Mathf.InverseLerp(cam.nearClipPlane, cam.farClipPlane, PerspectiveZ);
float maxHeight = GetPerspectiveHeight(cam.farClipPlane);
float minHeight = GetPerspectiveHeight(cam.nearClipPlane);
float height = Mathf.Lerp(minHeight, maxHeight, scale);
float width = height*cam.aspect;
screenRenderSize.x = width;
screenRenderSize.y = height;
screenRenderSize *= pixelsPerUnit;
}
return screenRenderSize;
}
/// <summary>
/// The integer width and height of the texture to render to
/// </summary>
/// <returns></returns>
protected int[] GetRenderTextureSize(Vector2 size, Vector2 aspect)
{
int width = Mathf.FloorToInt(Mathf.Abs(size.x / aspect.x));
int height = Mathf.FloorToInt(Mathf.Abs(size.y / aspect.y));
// Size is not integer, add padding
if (Math.Abs(size.x - width) > float.Epsilon)
width += 2;
if (Mathf.Abs(size.y - height) > float.Epsilon)
height += 2;
// Make sure this isn't an odd number
if (width%2 > 0)
width += 1;
if (height%2 > 0)
height += 1;
// Just in case
width = Mathf.Clamp(width, 2, 4096);
height = Mathf.Clamp(height, 2, 4096);
return new[] {width, height};
}
private void CalculateQuad(Vector2 screenRenderSize, int[] pixelRenderSize)
{
Vector2 pixelSize = new Vector2(pixelRenderSize[0], pixelRenderSize[1]) * zoomLevel;
quadOffset = pixelSize - screenRenderSize;
quadOffset /= 2;
quadOffset.x /= Screen.width;
quadOffset.y /= Screen.height;
Vector2 min = Vector2.zero - quadOffset;
Vector2 max = Vector2.one + quadOffset;
if (advancedSettings == null)
{
QuadMin = min;
QuadMax = max;
return;
}
Vector2 aspectStretch = advancedSettings.aspectStretch;
if (aspectStretch.x < float.Epsilon || aspectStretch.y < float.Epsilon)
return;
Vector2 center = (min + max) / 2;
min -= center;
max -= center;
min.x *= aspectStretch.x;
max.x *= aspectStretch.x;
min.y *= aspectStretch.y;
max.y *= aspectStretch.y;
min += center;
max += center;
QuadMin = min;
QuadMax = max;
}
public void ForceRefresh()
{
lastSettings.screenSize = new [] {0, 0};
}
public bool CheckCamera()
{
var currentSettings = new CamSettings(this, cam);
bool didChange = currentSettings.Equals(lastSettings) == false;
if (didChange)
SetupCamera(currentSettings);
return didChange;
}
}
}