Implement user-specified pixel shaders, redux

.github/actions/spell-check/dictionary/apis.txt

@@ -11,6 +11,7 @@ CYICON
 environstrings
 EXPCMDFLAGS
 EXPCMDSTATE
+frac
 fullkbd
 futex
 GETDESKWALLPAPER
@@ -33,7 +34,6 @@ IMap
 IObject
 IStorage
 ITaskbar
-llabs
 LCID
 llabs
 localtime
@@ -63,6 +63,7 @@ semver
 serializer
 shobjidl
 SIZENS
+smoothstep
 spsc
 sregex
 STDCPP

.github/actions/spell-check/dictionary/names.txt

@@ -12,16 +12,20 @@ ekg
 ethanschoonover
 Firefox
 Gatta
+glsl
 Grie
 Griese
 Hernan
 Howett
 Illhardt
+iquilezles
 jantari
 jerrysh
 Kaiyu
 kimwalisch
 KMehrain
+KODELIFE
+Kodelife
 Kourosh
 kowalczyk
 leonmsft
@@ -30,6 +34,7 @@ lukesampson
 Manandhar
 mbadolato
 Mehrain
+menger
 mgravell
 michaelniksa
 michkap
@@ -43,6 +48,7 @@ nvaccess
 nvda
 oising
 oldnewthing
+opengl
 osgwiki
 paulcam
 pauldotknopf
@@ -51,6 +57,7 @@ Pham
 Rincewind
 rprichard
 Schoonover
+shadertoy
 Somuah
 sonph
 sonpham
@@ -60,8 +67,8 @@ Wirt
 Wojciech
 zadjii
 Zamor
-Zamora
 zamora
+Zamora
 Zoey
 zorio
 Zverovich

.github/actions/spell-check/expect/expect.txt

@@ -24,8 +24,8 @@ ADDREF
 addressof
 ADDSTRING
 ADDTOOL
-AEnd
 aef
+AEnd
 AFew
 AFill
 AFX
@@ -628,6 +628,7 @@ doskey
 dotnet
 doubleclick
 downlevel
+DOWNSCALE
 dpg
 dpi
 DPIAPI
@@ -832,6 +833,7 @@ fuzzwrapper
 fwdecl
 fwe
 fwlink
+GAUSSIAN
 gb
 gci
 gcx
@@ -909,6 +911,7 @@ Goldmine
 gonce
 Google
 goutput
+GPUs
 Gravell's
 grayscale
 GREENSCROLL
@@ -1109,6 +1112,7 @@ INTERCEPTCOPYPASTE
 INTERNALNAME
 interop
 interoperability
+intersectors
 inthread
 intptr
 intsafe
@@ -1207,6 +1211,7 @@ KJ
 KLF
 KLMNOPQRST
 KLMNOPQRSTQQQQQ
+Kode
 KU
 KVM
 KX
@@ -1588,6 +1593,7 @@ OACR
 oauth
 objbase
 ocf
+ocolor
 odl
 oem
 oemcp
@@ -1786,6 +1792,7 @@ pragma
 prc
 prealigned
 prebuilt
+precendence
 precomp
 prect
 prefast
@@ -1831,6 +1838,7 @@ pshn
 PSHNOTIFY
 PSHORT
 pshpack
+psin
 PSINGLE
 psl
 psldl
@@ -1879,10 +1887,12 @@ QWER
 qzmp
 RAII
 RALT
+rasterbar
 rasterfont
 rasterization
 rawinput
 RAWPATH
+raytracers
 razzlerc
 rbar
 rbegin
@@ -1953,9 +1963,11 @@ RESETCONTENT
 resheader
 resizable
 resmimetype
+reso
 restrictedcapabilities
 resw
 resx
+RETROII
 retval
 rfa
 rfc
@@ -2026,11 +2038,14 @@ SBCSDBCS
 sbi
 sbiex
 sbold
+sbri
+scanbri
 scancode
 scanline
 schemename
 SCL
 scm
+scol
 scprintf
 SCRBUF
 SCRBUFSIZE
@@ -2164,6 +2179,9 @@ SOURCESDIRECTORY
 SPACEBAR
 spammy
 spand
+spe
+sph
+spherefunctions
 splashscreen
 sprintf
 sqlproj
@@ -2293,6 +2311,7 @@ tellp
 telnet
 telnetd
 templated
+teraflop
 terminalcore
 TERMINALSCROLLING
 terminfo
@@ -2541,6 +2560,7 @@ vga
 vgaoem
 viewkind
 viewports
+Viginetting
 Virt
 VIRTTERM
 Virtualizing
@@ -2757,6 +2777,7 @@ wwaproj
 WWith
 wx
 wxh
+wz
 xa
 xact
 xamarin
@@ -2806,7 +2827,10 @@ xutr
 xvalue
 XVIRTUALSCREEN
 XWalk
+XWV
 xy
+xyw
+Xzn
 yact
 YAML
 YCast
@@ -2822,6 +2846,7 @@ YVIRTUALSCREEN
 Yw
 YWalk
 yx
+yzx
 Zc
 ZCmd
 ZCtrl

doc/cascadia/profiles.schema.json

@@ -931,6 +931,10 @@
           "description": "When set to true, enable retro terminal effects. This is an experimental feature, and its continued existence is not guaranteed.",
           "type": "boolean"
         },
+        "experimental.pixelShaderEffect": {
+          "description": "If set to a file name or preset, compiles the pixel shader effect and applies it the terminal view. Currently 2 presets are supported `RETRO` and `RETROII`. This is an experimental feature, and its continued existence is not guaranteed.",
+          "type": "string"
+        },
         "fontFace": {
           "default": "Cascadia Mono",
           "description": "Name of the font face used in the profile.",

samples/PixelShaders/Broken.hlsl

@@ -0,0 +1,18 @@
+// Broken, can be used for explorative testing of pixel shader error handling
+Texture2D shaderTexture;
+SamplerState samplerState;
+
+cbuffer PixelShaderSettings {
+  float  Time;
+  float  Scale;
+  float2 Resolution;
+  float4 Background;
+};
+
+float4 main(float4 pos : SV_POSITION, float2 tex : TEXCOORD) : SV_TARGET
+{
+    // OOPS; vec4 is not a hlsl but a glsl datatype!
+    vec4 color = shaderTexture.Sample(samplerState, tex);
+
+    return color;
+}

samples/PixelShaders/Error.hlsl

@@ -0,0 +1,18 @@
+// Shader used to indicate something went wrong during shader loading
+Texture2D shaderTexture;
+SamplerState samplerState;
+
+cbuffer PixelShaderSettings {
+  float  Time;
+  float  Scale;
+  float2 Resolution;
+  float4 Background;
+};
+
+float4 main(float4 pos : SV_POSITION, float2 tex : TEXCOORD) : SV_TARGET
+{
+    float4 color = shaderTexture.Sample(samplerState, tex);
+    float bars = 0.5+0.5*sin(tex.y*100);
+    color.x += pow(bars, 20.0);
+    return color;
+}

samples/PixelShaders/Grayscale.hlsl

@@ -0,0 +1,32 @@
+// A minimal pixel shader that inverts the colors
+
+// The terminal graphics as a texture
+Texture2D shaderTexture;
+SamplerState samplerState;
+
+// Terminal settings such as the resolution of the texture
+cbuffer PixelShaderSettings {
+  // Time since pixel shader was enabled
+  float  Time;
+  // UI Scale
+  float  Scale;
+  // Resolution of the shaderTexture
+  float2 Resolution;
+  // Background color as rgba
+  float4 Background;
+};
+
+// A pixel shader is a program that given a texture coordinate (tex) produces a color
+//  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);
+    float avg = (color.x + color.y + color.z) / 3.0;
+    // Inverts the rgb values (xyz) but don't touch the alpha (w)
+    color.xyz = avg;
+
+    // Return the final color
+    return color;
+}

samples/PixelShaders/Invert.hlsl

@@ -0,0 +1,32 @@
+// A minimal pixel shader that inverts the colors
+
+// The terminal graphics as a texture
+Texture2D shaderTexture;
+SamplerState samplerState;
+
+// Terminal settings such as the resolution of the texture
+cbuffer PixelShaderSettings {
+  // Time since pixel shader was enabled
+  float  Time;
+  // UI Scale
+  float  Scale;
+  // Resolution of the shaderTexture
+  float2 Resolution;
+  // Background color as rgba
+  float4 Background;
+};
+
+// A pixel shader is a program that given a texture coordinate (tex) produces a color
+//  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);
+
+    // Inverts the rgb values (xyz) but don't touch the alpha (w)
+    color.xyz = 1.0 - color.xyz;
+
+    // Return the final color
+    return color;
+}

samples/PixelShaders/Nop.hlsl

@@ -0,0 +1,17 @@
+// Does nothing, serves as an example of a minimal pixel shader
+Texture2D shaderTexture;
+SamplerState samplerState;
+
+cbuffer PixelShaderSettings {
+  float  Time;
+  float  Scale;
+  float2 Resolution;
+  float4 Background;
+};
+
+float4 main(float4 pos : SV_POSITION, float2 tex : TEXCOORD) : SV_TARGET
+{
+    float4 color = shaderTexture.Sample(samplerState, tex);
+
+    return color;
+}