51 lines
1.5 KiB
HLSL
51 lines
1.5 KiB
HLSL
#include "PreparedSplatView.hlsli"
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cbuffer FrameConstants : register(b0)
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{
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float4x4 gViewProjection;
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float4x4 gView;
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float4x4 gProjection;
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float4 gCameraWorldPos;
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float4 gScreenParams;
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float4 gSettings;
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};
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StructuredBuffer<PreparedSplatView> gPreparedViews : register(t0);
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StructuredBuffer<uint> gOrderBuffer : register(t1);
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struct VertexOutput
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{
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float4 position : SV_Position;
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float4 color : COLOR0;
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float2 localPosition : TEXCOORD0;
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};
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VertexOutput MainVS(uint vertexId : SV_VertexID, uint instanceId : SV_InstanceID)
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{
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VertexOutput output = (VertexOutput)0;
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uint splatIndex = gOrderBuffer[instanceId];
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PreparedSplatView view = gPreparedViews[splatIndex];
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float4 color = UnpackPreparedColor(view);
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if (view.clipPosition.w <= 0.0)
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{
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const float nanValue = asfloat(0x7fc00000);
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output.position = float4(nanValue, nanValue, nanValue, nanValue);
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return output;
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}
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float2 quadPosition = float2(vertexId & 1, (vertexId >> 1) & 1) * 2.0 - 1.0;
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quadPosition *= 2.0;
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float2 scaledAxis1 = view.axis1 * gSettings.w;
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float2 scaledAxis2 = view.axis2 * gSettings.w;
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float2 deltaScreenPosition =
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(quadPosition.x * scaledAxis1 + quadPosition.y * scaledAxis2) * 2.0 / gScreenParams.xy;
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output.position = view.clipPosition;
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output.position.xy += deltaScreenPosition * view.clipPosition.w;
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output.color = color;
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output.localPosition = quadPosition;
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return output;
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}
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