siege-song/Data/Assets/FogVolume/Scripts/Other/TAA/Scripts/EffectBase.cs

// Copyright (c) <2015> <Playdead>
// This file is subject to the MIT License as seen in the root of this folder structure (LICENSE.TXT)
// AUTHOR: Lasse Jon Fuglsang Pedersen <lasse@playdead.com>

using UnityEngine;
namespace FogVolumePlaydeadTAA
{
    public abstract class EffectBase : MonoBehaviour
    {
        public void EnsureArray<T>(ref T[] array, int size, T initialValue = default(T))
        {
            if (array == null || array.Length != size)
            {
                array = new T[size];
                for (int i = 0; i != size; i++)
                    array[i] = initialValue;
            }
        }

        public void EnsureArray<T>(ref T[,] array, int size0, int size1, T defaultValue = default(T))
        {
            if (array == null || array.Length != size0 * size1)
            {
                array = new T[size0, size1];
                for (int i = 0; i != size0; i++)
                {
                    for (int j = 0; j != size1; j++)
                        array[i, j] = defaultValue;
                }
            }
        }

        public void EnsureMaterial(ref Material material, Shader shader)
        {
            if (shader != null)
            {
                if (material == null || material.shader != shader)
                    material = new Material(shader);
                if (material != null)
                    material.hideFlags = HideFlags.DontSave;
            }
            else
            {
                Debug.LogWarning("missing shader", this);
            }
        }

        public void EnsureDepthTexture(Camera camera)
        {
            if ((camera.depthTextureMode & DepthTextureMode.Depth) == 0)
                camera.depthTextureMode |= DepthTextureMode.Depth;
        }

        public void EnsureKeyword(Material material, string name, bool enabled)
        {
            if (enabled != material.IsKeywordEnabled(name))
            {
                if (enabled)
                    material.EnableKeyword(name);
                else
                    material.DisableKeyword(name);
            }
        }

        public bool EnsureRenderTarget(ref RenderTexture rt, int width, int height, RenderTextureFormat format, FilterMode filterMode, int depthBits = 0, int antiAliasing = 1)
        {
            if (rt != null && (rt.width != width || rt.height != height || rt.format != format || rt.filterMode != filterMode || rt.antiAliasing != antiAliasing))
            {
                RenderTexture.ReleaseTemporary(rt);
                rt = null;
            }
            if (rt == null)
            {
                rt = RenderTexture.GetTemporary(width, height, depthBits, format, RenderTextureReadWrite.Default, antiAliasing);
                rt.filterMode = filterMode;
                rt.wrapMode = TextureWrapMode.Clamp;
                return true;// new target
            }
            return false;// same target
        }

        public void ReleaseRenderTarget(ref RenderTexture rt)
        {
            if (rt != null)
            {
                RenderTexture.ReleaseTemporary(rt);
                rt = null;
            }
        }

        public void DrawFullscreenQuad()
        {
            GL.PushMatrix();
            GL.LoadOrtho();
            GL.Begin(GL.QUADS);
            {
                GL.MultiTexCoord2(0, 0.0f, 0.0f);
                GL.Vertex3(0.0f, 0.0f, 0.0f); // BL

                GL.MultiTexCoord2(0, 1.0f, 0.0f);
                GL.Vertex3(1.0f, 0.0f, 0.0f); // BR

                GL.MultiTexCoord2(0, 1.0f, 1.0f);
                GL.Vertex3(1.0f, 1.0f, 0.0f); // TR

                GL.MultiTexCoord2(0, 0.0f, 1.0f);
                GL.Vertex3(0.0f, 1.0f, 0.0f); // TL
            }
            GL.End();
            GL.PopMatrix();
        }
    }
}