42 lines
1.5 KiB
HLSL
42 lines
1.5 KiB
HLSL
// A simple animated shader that fades the terminal background back and forth between two colours
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// The terminal graphics as a texture
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Texture2D shaderTexture;
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SamplerState samplerState;
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// Terminal settings such as the resolution of the texture
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cbuffer PixelShaderSettings
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{
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// The number of seconds since the pixel shader was enabled
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float Time;
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// UI Scale
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float Scale;
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// Resolution of the shaderTexture
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float2 Resolution;
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// Background color as rgba
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float4 Background;
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};
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// pi and tau (2 * pi) are useful constants when using trigonometric functions
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#define TAU 6.28318530718
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// A pixel shader is a program that given a texture coordinate (tex) produces a color.
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// tex is an x,y tuple that ranges from 0,0 (top left) to 1,1 (bottom right).
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// Just ignore the pos parameter.
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float4 main(float4 pos : SV_POSITION, float2 tex : TEXCOORD) : SV_TARGET
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{
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// Read the color value at the current texture coordinate (tex)
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float4 sample = shaderTexture.Sample(samplerState, tex);
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// The number of seconds the breathing effect should span
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float duration = 5.0;
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float3 color1 = float3(0.3, 0.0, 0.5); // indigo
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float3 color2 = float3(0.1, 0.1, 0.44); // midnight blue
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// Set background colour based on the time
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float4 backgroundColor = float4(lerp(color1, color2, 0.5 * cos(TAU / duration * Time) + 0.5), 1.0);
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// Draw the terminal graphics over the background
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return lerp(backgroundColor, sample, sample.w);
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} |