Add Slang ports of the auto-box shaders

auto-box/box-center.slang

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+#version 450
+
+/*
+   Box Center Shader
+   Centers pre-scaled output into the viewport, to prevent unintentional non-integer scaling. Maintains 1x scale of the input.
+   Author: Themaister
+   License: Public domain
+*/
+
+layout(std140, set = 0, binding = 0) uniform UBO
+{
+   vec4 SourceSize;
+   vec4 OriginalSize;
+   vec4 OutputSize;
+   uint FrameCount;
+   mat4 MVP;
+} global;
+
+#pragma stage vertex
+layout(location = 0) in vec4 Position;
+layout(location = 1) in vec2 TexCoord;
+layout(location = 0) out vec2 vTexCoord;
+
+void main()
+{
+   gl_Position = global.MVP * Position;
+
+   vec2 box_scale = vec2(1.0);
+
+   vec2 scale = (global.OutputSize.xy / global.SourceSize.xy) / box_scale;
+   vec2 middle = vec2(0.5);
+   vec2 diff = TexCoord - middle;
+   vTexCoord = middle + diff * scale;
+}
+
+#pragma stage fragment
+layout(location = 0) in vec2 vTexCoord;
+layout(location = 0) out vec4 FragColor;
+layout(set = 0, binding = 2) uniform sampler2D Source;
+
+void main()
+{
+   FragColor = vec4(texture(Source, vTexCoord).rgb, 1.0);
+}

auto-box/box-max.slang

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+#version 450
+
+/*
+   Box Max Shader
+   Automatically scales output to the maximum integer scale possible.
+   Author: Themaister
+   License: Public domain
+*/
+
+layout(std140, set = 0, binding = 0) uniform UBO
+{
+   vec4 SourceSize;
+   vec4 OriginalSize;
+   vec4 OutputSize;
+   uint FrameCount;
+   mat4 MVP;
+} global;
+
+#pragma stage vertex
+layout(location = 0) in vec4 Position;
+layout(location = 1) in vec2 TexCoord;
+layout(location = 0) out vec2 vTexCoord;
+
+
+float min(vec2 x)
+{
+   if (x.x > x.y)
+      return x.y;
+   else
+      return x.x;
+}
+
+void main()
+{
+   gl_Position = global.MVP * Position;
+
+   vec2 box_scale = floor(global.OutputSize.xy / global.SourceSize.xy);
+   box_scale = vec2(min(box_scale), min(box_scale));
+
+   vec2 scale = (global.OutputSize.xy / global.SourceSize.xy) / box_scale;
+   vec2 middle = vec2(0.5);
+   vec2 diff = TexCoord - middle;
+   vTexCoord = middle + diff * scale;
+}
+
+#pragma stage fragment
+layout(location = 0) in vec2 vTexCoord;
+layout(location = 0) out vec4 FragColor;
+layout(set = 0, binding = 2) uniform sampler2D Source;
+
+void main()
+{
+   FragColor = vec4(texture(Source, vTexCoord).rgb, 1.0);
+}

auto-box/box.slang

@@ -0,0 +1,50 @@
+#version 450
+
+/*
+   Box Shader
+   Scales output according to the scale factor parameters.
+   Author: Themaister
+   License: Public domain
+*/
+
+
+layout(std140, set = 0, binding = 0) uniform UBO
+{
+   vec4 SourceSize;
+   vec4 OriginalSize;
+   vec4 OutputSize;
+   uint FrameCount;
+   mat4 MVP;
+   float x_scale;
+   float y_scale;
+} global;
+
+#pragma parameter x_scale "X Scale" 3.0 1.0 100.0 1.0
+#pragma parameter y_scale "Y Scale" 3.0 1.0 100.0 1.0
+
+#pragma stage vertex
+layout(location = 0) in vec4 Position;
+layout(location = 1) in vec2 TexCoord;
+layout(location = 0) out vec2 vTexCoord;
+
+void main()
+{
+   gl_Position = global.MVP * Position;
+
+   vec2 box_scale = vec2(global.x_scale, global.y_scale);
+
+   vec2 scale = (global.OutputSize.xy / global.SourceSize.xy) / box_scale;
+   vec2 middle = vec2(0.5);
+   vec2 diff = TexCoord - middle;
+   vTexCoord = middle + diff * scale;
+}
+
+#pragma stage fragment
+layout(location = 0) in vec2 vTexCoord;
+layout(location = 0) out vec4 FragColor;
+layout(set = 0, binding = 2) uniform sampler2D Source;
+
+void main()
+{
+   FragColor = vec4(texture(Source, vTexCoord).rgb, 1.0);
+}