1 files changed, 115 insertions, 0 deletions
diff --git a/UnityEngine.PostProcessing/GraphicsUtils.cs b/UnityEngine.PostProcessing/GraphicsUtils.cs
new file mode 100644
index 0000000..9062c77
--- /dev/null
+++ b/UnityEngine.PostProcessing/GraphicsUtils.cs
@@ -0,0 +1,115 @@
+namespace UnityEngine.PostProcessing;
+
+public static class GraphicsUtils
+{
+	private static Texture2D s_WhiteTexture;
+
+	private static Mesh s_Quad;
+
+	public static bool isLinearColorSpace => QualitySettings.activeColorSpace == ColorSpace.Linear;
+
+	public static bool supportsDX11 => SystemInfo.graphicsShaderLevel >= 50 && SystemInfo.supportsComputeShaders;
+
+	public static Texture2D whiteTexture
+	{
+		get
+		{
+			if (s_WhiteTexture != null)
+			{
+				return s_WhiteTexture;
+			}
+			s_WhiteTexture = new Texture2D(1, 1, TextureFormat.ARGB32, mipmap: false);
+			s_WhiteTexture.SetPixel(0, 0, new Color(1f, 1f, 1f, 1f));
+			s_WhiteTexture.Apply();
+			return s_WhiteTexture;
+		}
+	}
+
+	public static Mesh quad
+	{
+		get
+		{
+			if (s_Quad != null)
+			{
+				return s_Quad;
+			}
+			Vector3[] vertices = new Vector3[4]
+			{
+				new Vector3(-1f, -1f, 0f),
+				new Vector3(1f, 1f, 0f),
+				new Vector3(1f, -1f, 0f),
+				new Vector3(-1f, 1f, 0f)
+			};
+			Vector2[] uv = new Vector2[4]
+			{
+				new Vector2(0f, 0f),
+				new Vector2(1f, 1f),
+				new Vector2(1f, 0f),
+				new Vector2(0f, 1f)
+			};
+			int[] triangles = new int[6] { 0, 1, 2, 1, 0, 3 };
+			Mesh mesh = new Mesh();
+			mesh.vertices = vertices;
+			mesh.uv = uv;
+			mesh.triangles = triangles;
+			s_Quad = mesh;
+			s_Quad.RecalculateNormals();
+			s_Quad.RecalculateBounds();
+			return s_Quad;
+		}
+	}
+
+	public static void Blit(Material material, int pass)
+	{
+		GL.PushMatrix();
+		GL.LoadOrtho();
+		material.SetPass(pass);
+		GL.Begin(5);
+		GL.TexCoord2(0f, 0f);
+		GL.Vertex3(0f, 0f, 0.1f);
+		GL.TexCoord2(1f, 0f);
+		GL.Vertex3(1f, 0f, 0.1f);
+		GL.TexCoord2(0f, 1f);
+		GL.Vertex3(0f, 1f, 0.1f);
+		GL.TexCoord2(1f, 1f);
+		GL.Vertex3(1f, 1f, 0.1f);
+		GL.End();
+		GL.PopMatrix();
+	}
+
+	public static void ClearAndBlit(Texture source, RenderTexture destination, Material material, int pass, bool clearColor = true, bool clearDepth = false)
+	{
+		RenderTexture active = RenderTexture.active;
+		RenderTexture.active = destination;
+		GL.Clear(clearDepth: false, clearColor, Color.clear);
+		GL.PushMatrix();
+		GL.LoadOrtho();
+		material.SetTexture("_MainTex", source);
+		material.SetPass(pass);
+		GL.Begin(5);
+		GL.TexCoord2(0f, 0f);
+		GL.Vertex3(0f, 0f, 0.1f);
+		GL.TexCoord2(1f, 0f);
+		GL.Vertex3(1f, 0f, 0.1f);
+		GL.TexCoord2(0f, 1f);
+		GL.Vertex3(0f, 1f, 0.1f);
+		GL.TexCoord2(1f, 1f);
+		GL.Vertex3(1f, 1f, 0.1f);
+		GL.End();
+		GL.PopMatrix();
+		RenderTexture.active = active;
+	}
+
+	public static void Destroy(Object obj)
+	{
+		if (obj != null)
+		{
+			Object.Destroy(obj);
+		}
+	}
+
+	public static void Dispose()
+	{
+		Destroy(s_Quad);
+	}
+}