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102 lines
2.1 KiB
102 lines
2.1 KiB
Shader "Frozen/SpaceMapping"
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{
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Properties
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{
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_MainTex ("Texture", 2D) = "white" {}
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yFlip ("display name", Int) = 0
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}
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SubShader
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{
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Tags { "RenderType"="Opeque" }
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LOD 100
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//Blend One Zero
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Blend One OneMinusSrcAlpha
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Pass
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{
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CGPROGRAM
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#pragma vertex vert
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#pragma fragment frag
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#include "UnityCG.cginc"
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struct appdata
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{
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float4 vertex : POSITION;
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float2 uv : TEXCOORD0;
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};
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struct v2f
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{
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float4 vertex : SV_POSITION;
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float2 uv : TEXCOORD0;
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};
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sampler2D _MainTex;
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float4 _MainTex_ST;
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int yFlip;
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v2f vert (appdata v)
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{
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v2f o;
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o.vertex = UnityObjectToClipPos(v.vertex);
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o.uv = TRANSFORM_TEX(v.uv, _MainTex);
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return o;
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}
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float4x4 homography[3];
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float3 homo_space;
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float2 texture_size;
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fixed4 frag (v2f i) : SV_Target
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{
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float2 uv = i.uv;
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//if (yFlip == 1) uv = i.uv * float2(1.0, -1.0) + float2(0.0, 1.0);
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fixed4 col = tex2D(_MainTex, uv);
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col.rgb *= col.a;
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const float3 space = homo_space;
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//const float2 size = float2(space.x + space.z * 2.0, space.y + space.z * 2.0);
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//const float dim = space.x + space.z * 2.0;
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const float2 clipped_size = texture_size;
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float2 pos = uv * clipped_size;
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if (pos.y <= space.z)
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{
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if (pos.x < space.z || pos.x > space.z + space.x)
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{
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pos = float2(0, 0);
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}
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else
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{
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float4 homo_pos = mul(homography[0], float4(pos, 0, 1));
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pos = homo_pos.xy / homo_pos.w;
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}
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}
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else if (pos.x <= space.z)
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{
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float4 homo_pos = mul(homography[1], float4(pos, 0, 1));
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pos = homo_pos.xy / homo_pos.w;
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}
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else if (pos.x >= space.z + space.x)
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{
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float4 homo_pos = mul(homography[2], float4(pos, 0, 1));
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pos = homo_pos.xy / homo_pos.w;
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}
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uv = pos / clipped_size;
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if (yFlip == 1) uv = uv * float2(1.0, -1.0) + float2(0.0, 1.0);
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col = any(length(pos)) ? tex2D(_MainTex, uv) : float4(0, 0, 0, 1);
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//col = tex2D(_MainTex, i.uv * float2(1.0, -1.0) + float2(0.0, 1.0));
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//col = float4(i.uv, 0.0, 1.0);
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return col;
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}
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ENDCG
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}
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}
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}
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