49 lines
1.2 KiB
HLSL
49 lines
1.2 KiB
HLSL
struct GlyphBitmap
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{
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uint2 Position; // x y, in texels
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uint2 Size; // width height
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};
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// set 0: constant
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[[vk::binding(0, 0)]] SamplerState ClosestSampler;
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[[vk::binding(1, 0)]] Texture2D FontTexture;
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[[vk::binding(2, 0)]] StructuredBuffer<GlyphBitmap> Glyphs;
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struct VSInput
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{
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float2 Position : POSITION0;
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float2 Texture : TEXCOORD0;
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// per-instance
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uint2 InstancePosition : InstancePosition;
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uint InstanceGlyph : InstanceGlyph;
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float4 InstanceColor : InstanceColor;
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};
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struct VSOutput
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{
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float4 Position : SV_POSITION;
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float2 Texture : NORMAL0;
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};
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[shader("vertex")]
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VSOutput VSMain(VSInput input)
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{
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float2 inverseTexel = float2(1.0 / 256.0, 1.0 / 256.0);
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float2 inversePixel = float2(1.0 / 1024.0, 1.0 / 1024.0);
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int index = input.InstanceGlyph;
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VSOutput output = (VSOutput)0;
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float2 position = (input.Texture * Glyphs[index].Size + input.InstancePosition) * inversePixel;
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output.Position = float4(position * 2.0 - 1.0, 0, 1);
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output.Texture = (input.Texture * Glyphs[index].Size + Glyphs[index].Position) * inverseTexel;
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return output;
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}
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[shader("pixel")]
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float4 PSMain(VSOutput input) : SV_TARGET
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{
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float4 color = FontTexture.Sample(ClosestSampler, input.Texture);
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return float4(color.xxx, 1.0);
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}
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