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73 行
2.6 KiB
73 行
2.6 KiB
#if SHADERPASS != SHADERPASS_DBUFFER
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#error SHADERPASS_is_not_correctly_define
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#endif
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#include "VertMesh.hlsl"
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float3 RemoveScale(float3 val)
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{
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return normalize(val / length(val));
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}
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VaryingsMeshType Transform(AttributesMesh input)
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{
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VaryingsMeshType output;
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UNITY_SETUP_INSTANCE_ID(input)
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UNITY_TRANSFER_INSTANCE_ID(input, output);
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float3 positionWS = TransformObjectToWorld(input.positionOS);
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positionWS = GetCameraRelativePositionWS(positionWS);
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output.positionCS = TransformWorldToHClip(positionWS);
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float3x3 decalRotation;
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decalRotation[0] = RemoveScale(float3(UNITY_MATRIX_M[0][0], UNITY_MATRIX_M[0][1], UNITY_MATRIX_M[0][2]));
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decalRotation[2] = RemoveScale(float3(UNITY_MATRIX_M[1][0], UNITY_MATRIX_M[1][1], UNITY_MATRIX_M[1][2]));
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decalRotation[1] = RemoveScale(float3(UNITY_MATRIX_M[2][0], UNITY_MATRIX_M[2][1], UNITY_MATRIX_M[2][2]));
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decalRotation = transpose(decalRotation);
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output.positionWS = decalRotation[0];
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output.normalWS = decalRotation[1];
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output.tangentWS = float4(decalRotation[2], 0.0);
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return output;
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}
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PackedVaryingsType Vert(AttributesMesh inputMesh)
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{
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VaryingsType varyingsType;
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varyingsType.vmesh = Transform(inputMesh);
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return PackVaryingsType(varyingsType);
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}
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void Frag( PackedVaryingsToPS packedInput,
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OUTPUT_DBUFFER(outDBuffer)
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)
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{
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FragInputs input = UnpackVaryingsMeshToFragInputs(packedInput.vmesh);
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PositionInputs posInput = GetPositionInput(input.positionSS.xy, _ScreenSize.zw);
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float depth = LOAD_TEXTURE2D(_MainDepthTexture, posInput.positionSS).x;
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UpdatePositionInput(depth, UNITY_MATRIX_I_VP, UNITY_MATRIX_VP, posInput);
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// Transform from world space to decal space (DS) to clip the decal.
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// For this we must use absolute position.
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// There is no lose of precision here as it doesn't involve the camera matrix
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float3 positionWS = GetAbsolutePositionWS(posInput.positionWS);
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float3 positionDS = mul(UNITY_MATRIX_I_M, float4(positionWS, 1.0)).xyz;
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positionDS = positionDS * float3(1.0, -1.0, 1.0) + float3(0.5, 0.0f, 0.5);
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clip(positionDS); // clip negative value
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clip(1.0 - positionDS); // Clip value above one
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DecalSurfaceData surfaceData;
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float3x3 decalToWorld;
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// using the interpolators directly, because UnpackVaryingsMeshToFragInputs does some tangent space manipulations
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decalToWorld[0] = packedInput.vmesh.interpolators0;
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decalToWorld[1] = packedInput.vmesh.interpolators1;
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decalToWorld[2] = packedInput.vmesh.interpolators2.xyz;
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GetSurfaceData(positionDS.xz, decalToWorld, surfaceData);
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ENCODE_INTO_DBUFFER(surfaceData, outDBuffer);
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}
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