67 lines
2.3 KiB
HLSL
67 lines
2.3 KiB
HLSL
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#ifndef UNIVERSAL_PARTICLESINSTANCING_INCLUDED
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#define UNIVERSAL_PARTICLESINSTANCING_INCLUDED
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#if defined(UNITY_PROCEDURAL_INSTANCING_ENABLED) && !defined(SHADER_TARGET_SURFACE_ANALYSIS)
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#define UNITY_PARTICLE_INSTANCING_ENABLED
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#endif
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#if defined(UNITY_PARTICLE_INSTANCING_ENABLED)
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#ifndef UNITY_PARTICLE_INSTANCE_DATA
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#define UNITY_PARTICLE_INSTANCE_DATA DefaultParticleInstanceData
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#endif
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struct DefaultParticleInstanceData
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{
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float3x4 transform;
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uint color;
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float animFrame;
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};
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StructuredBuffer<UNITY_PARTICLE_INSTANCE_DATA> unity_ParticleInstanceData;
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float4 unity_ParticleUVShiftData;
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half unity_ParticleUseMeshColors;
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void ParticleInstancingMatrices(out float4x4 objectToWorld, out float4x4 worldToObject)
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{
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UNITY_PARTICLE_INSTANCE_DATA data = unity_ParticleInstanceData[unity_InstanceID];
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// transform matrix
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objectToWorld._11_21_31_41 = float4(data.transform._11_21_31, 0.0f);
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objectToWorld._12_22_32_42 = float4(data.transform._12_22_32, 0.0f);
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objectToWorld._13_23_33_43 = float4(data.transform._13_23_33, 0.0f);
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objectToWorld._14_24_34_44 = float4(data.transform._14_24_34, 1.0f);
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// inverse transform matrix (TODO: replace with a library implementation if/when available)
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float3x3 worldToObject3x3;
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worldToObject3x3[0] = objectToWorld[1].yzx * objectToWorld[2].zxy - objectToWorld[1].zxy * objectToWorld[2].yzx;
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worldToObject3x3[1] = objectToWorld[0].zxy * objectToWorld[2].yzx - objectToWorld[0].yzx * objectToWorld[2].zxy;
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worldToObject3x3[2] = objectToWorld[0].yzx * objectToWorld[1].zxy - objectToWorld[0].zxy * objectToWorld[1].yzx;
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float det = dot(objectToWorld[0].xyz, worldToObject3x3[0]);
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worldToObject3x3 = transpose(worldToObject3x3);
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worldToObject3x3 *= rcp(det);
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float3 worldToObjectPosition = mul(worldToObject3x3, -objectToWorld._14_24_34);
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worldToObject._11_21_31_41 = float4(worldToObject3x3._11_21_31, 0.0f);
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worldToObject._12_22_32_42 = float4(worldToObject3x3._12_22_32, 0.0f);
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worldToObject._13_23_33_43 = float4(worldToObject3x3._13_23_33, 0.0f);
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worldToObject._14_24_34_44 = float4(worldToObjectPosition, 1.0f);
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}
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void ParticleInstancingSetup()
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{
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ParticleInstancingMatrices(unity_ObjectToWorld, unity_WorldToObject);
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}
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#else
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void ParticleInstancingSetup() {}
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#endif
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#endif // UNIVERSAL_PARTICLESINSTANCING_INCLUDED
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