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| Original file line number | Diff line number | Diff line change |
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| // A minimal pixel shader that outlines text | ||
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| // The terminal graphics as a texture | ||
| Texture2D shaderTexture; | ||
| SamplerState samplerState; | ||
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| // Terminal settings such as the resolution of the texture | ||
| cbuffer PixelShaderSettings { | ||
| // The number of seconds since the pixel shader was enabled | ||
| float Time; | ||
| // UI Scale | ||
| float Scale; | ||
| // Resolution of the shaderTexture | ||
| float2 Resolution; | ||
| // Background color as rgba | ||
| float4 Background; | ||
| }; | ||
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| // A pixel shader is a program that given a texture coordinate (tex) produces a color. | ||
| // tex is an x,y tuple that ranges from 0,0 (top left) to 1,1 (bottom right). | ||
| // Just ignore the pos parameter. | ||
| float4 main(float4 pos : SV_POSITION, float2 tex : TEXCOORD) : SV_TARGET | ||
| { | ||
| // Read the color value at the current texture coordinate (tex) | ||
| // float4 is tuple of 4 floats, rgba | ||
| float4 color = shaderTexture.Sample(samplerState, tex); | ||
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| // Read the color value at some offset, will be used as shadow. For the best | ||
| // effect, read the colors offset on the left, right, top, bottom of this | ||
| // fragment, as well as on the corners of this fragment. | ||
| // | ||
| // You could get away with fewer samples, but the resulting outlines will be | ||
| // blurrier. | ||
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| //left, right, top, bottom: | ||
| float4 leftColor = shaderTexture.Sample(samplerState, tex+1.0*Scale*float2( 1.0, 0.0)/Resolution.y); | ||
| float4 rightColor = shaderTexture.Sample(samplerState, tex+1.0*Scale*float2(-1.0, 0.0)/Resolution.y); | ||
| float4 topColor = shaderTexture.Sample(samplerState, tex+1.0*Scale*float2( 0.0, 1.0)/Resolution.y); | ||
| float4 bottomColor = shaderTexture.Sample(samplerState, tex+1.0*Scale*float2( 0.0, -1.0)/Resolution.y); | ||
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| // Corners | ||
| float4 topLeftColor = shaderTexture.Sample(samplerState, tex+1.0*Scale*float2( 1.0, 1.0)/Resolution.y); | ||
| float4 topRightColor = shaderTexture.Sample(samplerState, tex+1.0*Scale*float2(-1.0, 1.0)/Resolution.y); | ||
| float4 bottomLeftColor = shaderTexture.Sample(samplerState, tex+1.0*Scale*float2( 1.0, -1.0)/Resolution.y); | ||
| float4 bottomRightColor = shaderTexture.Sample(samplerState, tex+1.0*Scale*float2(-1.0, -1.0)/Resolution.y); | ||
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| // Now, if any of those adjacent cells has text in it, then the *color vec4 | ||
| // will have a non-zero .w (which is used for alpha). Use that alpha value | ||
| // to add some black to the current fragment. | ||
| // | ||
| // This will result in only coloring fragments adjacent to text, but leaving | ||
| // background images (for example) untouched. | ||
| float3 outlineColor = float3(0, 0, 0); | ||
| float4 result = color; | ||
| result = result + float4(outlineColor, leftColor.w); | ||
| result = result + float4(outlineColor, rightColor.w); | ||
| result = result + float4(outlineColor, topColor.w); | ||
| result = result + float4(outlineColor, bottomColor.w); | ||
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| result = result + float4(outlineColor, topLeftColor.w); | ||
| result = result + float4(outlineColor, topRightColor.w); | ||
| result = result + float4(outlineColor, bottomLeftColor.w); | ||
| result = result + float4(outlineColor, bottomRightColor.w); | ||
| return result; | ||
| } |
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