b140299e50
Co-authored-by: mrange <marten_range@hotmail.com> I loved the pixel shaders in #7058, but that PR needed a bit of polish to be ready for ingestion. This PR is almost _exactly_ that PR, with some small changes. * It adds a new pre-profile setting `"experimental.pixelShaderPath"`, which lets the user set a pixel shader to use with the Terminal. - CHANGED FROM #7058: It does _not_ add any built-in shaders. - CHANGED FROM #7058: it will _override_ `experimental.retroTerminalEffect` * It adds a bunch of sample shaders in `samples/shaders`. Included: - A NOP shader as a base to build from. - An "invert" shader that inverts the colors, as a simple example - An "grayscale" shader that converts all colors to grayscale, as a simple example - An "raster bars" shader that draws some colored bars on the screen with a drop shadow, as a more involved example - The original retro terminal effects, as a more involved example - It also includes a broken shader, as an example of what heppens when the shader fails to compile - CHANGED FROM #7058: It does _not_ add the "retroII" shader we were all worried about. * When a shader fails to be found or fails to compile, we'll display an error dialog to the user with a relevant error message. - CHANGED FROM #7058: Originally, #7058 would display "error bars" on the screen. I've removed that, and had the Terminal disable the shader entirely then. * Renames the `toggleRetroEffect` action to `toggleShaderEffect`. (`toggleRetroEffect` is now an alias to `toggleShaderEffect`). This action will turn the shader OR the retro effects on/off. `toggleShaderEffect` works the way you'd expect it to, but the mental math on _how_ is a little weird. The logic is basically: ``` useShader = shaderEffectsEnabled ? (pixelShaderProvided ? pixelShader : (retroEffectEnabled ? retroEffect : null ) ) : null ``` and `toggleShaderEffect` toggles `shaderEffectsEnabled`. * If you've got both a shader and retro enabled, `toggleShaderEffect` will toggle between the shader on/off. * If you've got a shader and retro disabled, `toggleShaderEffect` will toggle between the shader on/off. References #6191 References #7058 Closes #7013 Closes #3930 "Add setting to retro terminal shader to control blur radius, color" Closes #3929 "Add setting to retro terminal shader to enable drawing scanlines" - At this point, just roll your own version of the shader.
58 lines
2.1 KiB
HLSL
58 lines
2.1 KiB
HLSL
// A minimal pixel shader that shows some raster bars
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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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// Time since 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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// A pixel shader is a program that given a texture coordinate (tex) produces a color
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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 is tuple of 4 floats, rgba
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float4 color = shaderTexture.Sample(samplerState, tex);
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// Read the color value at some offset, will be used as shadow
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float4 ocolor = shaderTexture.Sample(samplerState, tex+2.0*Scale*float2(-1.0, -1.0)/Resolution.y);
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// Thickness of raster
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const float thickness = 0.1;
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float ny = floor(tex.y/thickness);
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float my = tex.y%thickness;
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const float pi = 3.141592654;
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// ny is used to compute the rasterbar base color
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float cola = ny*2.0*pi;
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float3 col = 0.75+0.25*float3(sin(cola*0.111), sin(cola*0.222), sin(cola*0.333));
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// my is used to compute the rasterbar brightness
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// smoothstep is a great little function: https://en.wikipedia.org/wiki/Smoothstep
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float brightness = 1.0-smoothstep(0.0, thickness*0.5, abs(my - 0.5*thickness));
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float3 rasterColor = col*brightness;
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// lerp(x, y, a) is another very useful function: https://en.wikipedia.org/wiki/Linear_interpolation
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float3 final = rasterColor;
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// Create the drop shadow of the terminal graphics
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// .w is the alpha channel, 0 is fully transparent and 1 is fully opaque
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final = lerp(final, float(0.0), ocolor.w);
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// Draw the terminal graphics
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final = lerp(final, color.xyz, color.w);
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// Return the final color, set alpha to 1 (ie opaque)
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return float4(final, 1.0);
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} |