58 lines
1.5 KiB
HLSL
58 lines
1.5 KiB
HLSL
// Copyright (c) 2012-2024 Wojciech Figat. All rights reserved.
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#ifndef __GUI_COMMON__
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#define __GUI_COMMON__
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#include "./Flax/Common.hlsl"
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#define CLIPPING_ENABLE 1
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struct Render2DVertex
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{
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float2 Position : POSITION0;
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float2 TexCoord : TEXCOORD0;
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float4 Color : COLOR0;
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float4 CustomDataAndClipOrigin : TEXCOORD1; // x-per-geometry type, y-features mask, zw-clip origin
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float4 ClipExtents : TEXCOORD2;
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};
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struct VS2PS
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{
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float4 Position : SV_Position;
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float4 Color : COLOR0;
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float2 TexCoord : TEXCOORD0;
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float2 CustomData : TEXCOORD1;
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float4 ClipExtents : TEXCOORD2;
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float4 ClipOriginAndPos : TEXCOORD3;
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};
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float cross2(float2 a, float2 b)
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{
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return a.x * b.y - a.y * b.x;
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}
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// Given a point p and a parallelogram defined by point a and vectors b and c, determines in p is inside the parallelogram. Returns a 4-vector that can be used with the clip instruction.
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float4 PointInParallelogram(float2 p, float2 a, float4 bc)
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{
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float2 o = p - a;
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float invD = 1 / cross2(bc.xy, bc.zw);
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float2 t = (o.x * bc.yw - o.y * bc.xz) * float2(-invD, invD);
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return float4(t, float2(1, 1) - t);
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}
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void PerformClipping(float2 clipOrigin, float2 windowPos, float4 clipExtents)
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{
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#if CLIPPING_ENABLE
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// Clip pixels which are outside the clipping rect
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float4 clipTest = PointInParallelogram(windowPos, clipOrigin, clipExtents);
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clip(clipTest);
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#endif
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}
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void PerformClipping(VS2PS input)
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{
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PerformClipping(input.ClipOriginAndPos.xy, input.ClipOriginAndPos.zw, input.ClipExtents);
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}
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#endif
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