52 lines
1.4 KiB
GLSL
52 lines
1.4 KiB
GLSL
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// Copyright 2020 Google LLC
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Texture2D textureSmoke : register(t1);
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SamplerState samplerSmoke : register(s1);
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Texture2D textureFire : register(t2);
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SamplerState samplerFire : register(s2);
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struct VSOutput
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{
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float4 Pos : SV_POSITION;
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[[vk::location(0)]] float4 Color : COLOR0;
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[[vk::location(1)]] float Alpha : TEXCOODR0;
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[[vk::location(2)]] int Type : TEXCOODR1;
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[[vk::location(3)]] float Rotation : TEXCOODR2;
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[[vk::location(4)]] float2 CenterPos : POSITION1;
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[[vk::location(5)]] float PointSize : TEXCOORD3;
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};
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float4 main (VSOutput input) : SV_TARGET
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{
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float4 color;
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float alpha = (input.Alpha <= 1.0) ? input.Alpha : 2.0 - input.Alpha;
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// Rotate texture coordinates
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// Rotate UV
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float rotCenter = 0.5;
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float rotCos = cos(input.Rotation);
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float rotSin = sin(input.Rotation);
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float2 PointCoord = (input.Pos.xy - input.CenterPos.xy) / input.PointSize + 0.5;
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float2 rotUV = float2(
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rotCos * (PointCoord.x - rotCenter) + rotSin * (PointCoord.y - rotCenter) + rotCenter,
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rotCos * (PointCoord.y - rotCenter) - rotSin * (PointCoord.x - rotCenter) + rotCenter);
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float4 outFragColor;
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if (input.Type == 0)
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{
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// Flame
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color = textureFire.Sample(samplerFire, rotUV);
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outFragColor.a = 0.0;
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}
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else
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{
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// Smoke
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color = textureSmoke.Sample(samplerSmoke, rotUV);
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outFragColor.a = color.a * alpha;
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}
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outFragColor.rgb = color.rgb * input.Color.rgb * alpha;
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return outFragColor;
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}
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