initial commit.

.gitignore

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+# Unity3D temporary directories
+/[Ll]ibrary/
+/[Tt]emp/
+/[Oo]bj/
+/[Bb]uild/
+
+# Autogenerated VS/MD solution and project files
+*.csproj
+*.unityproj
+*.sln
+*.suo
+*.tmp
+*.user
+*.userprefs
+*.pidb
+*.booproj
+
+# Unity3D generated meta files
+*.pidb.meta
+
+# Unity3D Generated File On Crash Reports
+sysinfo.txt
+
+# Others
+.DS_Store
+.vscode

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Assets/uHomography/Sahders/Homography.shader

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+Shader "uHomography/Homography"
+{
+
+Properties
+{
+	_MainTex ("Texture", 2D) = "white" {}
+}
+
+CGINCLUDE
+
+#include "UnityCG.cginc"
+
+struct appdata_clear
+{
+    float4 vertex : POSITION;
+};
+
+struct v2f_clear
+{
+    float4 vertex : SV_POSITION;
+};
+
+struct appdata_homography
+{
+    float4 vertex : POSITION;
+    float2 uv : TEXCOORD0;
+};
+
+struct v2f_homography
+{
+	float2 screenPos : TEXCOORD1;
+    float4 vertex : SV_POSITION;
+};
+
+sampler2D _MainTex;
+float4 _MainTex_ST;
+float _Homography[9];
+float _InvHomography[9];
+
+v2f_clear vert_clear(appdata_clear v)
+{
+	v2f_clear o;
+	o.vertex = UnityObjectToClipPos(v.vertex);
+	return o;
+}
+
+fixed4 frag_clear(appdata_clear i) : SV_Target
+{
+	return 0;
+}
+
+v2f_homography vert_homography(appdata_homography v)
+{
+	v2f_homography o;
+
+	float4 p = v.vertex;
+	float s =  _Homography[6] * p.x + _Homography[7] * p.y + _Homography[8];
+	float x = (_Homography[0] * p.x + _Homography[1] * p.y + _Homography[2]) / s;
+	float y = (_Homography[3] * p.x + _Homography[4] * p.y + _Homography[5]) / s;
+	o.vertex = float4(2 * (x - 0.5), 2 * (y - 0.5), 0, 1);
+	o.screenPos = float2(o.vertex.x, o.vertex.y);
+
+	return o;
+}
+
+fixed4 frag_homography(v2f_homography i) : SV_Target
+{
+	float2 p = (i.screenPos + 1.0) * 0.5;
+	float s =  _InvHomography[6] * p.x + _InvHomography[7] * p.y + _InvHomography[8];
+	float u = (_InvHomography[0] * p.x + _InvHomography[1] * p.y + _InvHomography[2]) / s;
+	float v = (_InvHomography[3] * p.x + _InvHomography[4] * p.y + _InvHomography[5]) / s;
+	float2 uv = float2(u, v);
+	return tex2D(_MainTex, uv);
+}
+
+ENDCG
+
+SubShader
+{
+	Blend Off
+	ZTest Always
+	ZWrite Off
+	Cull Off
+	Lighting Off
+
+	Pass
+	{
+		CGPROGRAM
+		#pragma vertex vert_clear
+		#pragma fragment frag_clear
+		ENDCG
+	}
+
+	Pass
+	{
+		CGPROGRAM
+		#pragma vertex vert_homography
+		#pragma fragment frag_homography
+		ENDCG
+	}
+}
+
+}