46 lines
No EOL
1,020 B
Text
46 lines
No EOL
1,020 B
Text
/* Copyright (c) 2025, Sascha Willems
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*
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* SPDX-License-Identifier: MIT
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*
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*/
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struct VSOutput
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{
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float4 Pos : SV_POSITION;
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float2 UV;
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};
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struct UBO
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{
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float4x4 projection[2];
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float4x4 modelview[2];
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float4 lightPos;
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float distortionAlpha;
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};
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ConstantBuffer<UBO> ubo;
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Sampler2DArray samplerView;
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[[SpecializationConstant]] const float VIEW_LAYER = 0.0f;
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[shader("vertex")]
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VSOutput vertexMain(uint VertexIndex: SV_VertexID)
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{
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VSOutput output;
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output.UV = float2((VertexIndex << 1) & 2, VertexIndex & 2);
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output.Pos = float4(output.UV * 2.0f - 1.0f, 0.0f, 1.0f);
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return output;
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}
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[shader("fragment")]
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float4 fragmentMain(VSOutput input)
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{
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const float alpha = ubo.distortionAlpha;
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float2 p1 = float2(2.0 * input.UV - 1.0);
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float2 p2 = p1 / (1.0 - alpha * length(p1));
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p2 = (p2 + 1.0) * 0.5;
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bool inside = ((p2.x >= 0.0) && (p2.x <= 1.0) && (p2.y >= 0.0) && (p2.y <= 1.0));
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return inside ? samplerView.Sample(float3(p2, VIEW_LAYER)) : float4(0.0, 0.0, 0.0, 0.0);
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} |