add bigblur shader and presets

border/bigblur-crt.slangp

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+shaders = 4
+
+shader0 = ../crt/shaders/crt-aperture.slang
+scale_type0 = source
+scale0 = 4.0
+filter_linear0 = false
+alias0 = Reference
+
+shader1 = ../blurs/blur11fast-vertical.slang
+scale_type1 = source
+scale1 = 0.5
+
+shader2 = ../blurs/blur11fast-horizontal.slang
+scale_type2 = source
+scale2 = 0.5
+
+shader3 = shaders/bigblur.slang

border/bigblur.slangp

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+shaders = 4
+
+shader0 = ../misc/image-adjustment.slang
+alias0 = Reference
+
+shader1 = ../blurs/blur11fast-vertical.slang
+scale_type1 = source
+scale1 = 1.0
+
+shader2 = ../blurs/blur11fast-horizontal.slang
+scale_type2 = source
+scale2 = 1.0
+
+shader3 = shaders/bigblur.slang

border/shaders/bigblur.slang

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+#version 450
+
+// BigBlur by hunterk
+// license: public domain
+
+layout(push_constant) uniform Push
+{
+	vec4 OutputSize;
+	vec4 OriginalSize;
+	vec4 SourceSize;
+	uint FrameCount;
+	float box_scale;
+	float location_x;
+	float location_y;
+	float in_res_x;
+	float in_res_y;
+	float border_on_top;
+} params;
+
+#pragma parameter box_scale "Image Scale" 4.0 1.0 10.0 1.0
+#pragma parameter location_x "Viewport X Pos." 0.5 0.0 1.0 0.05
+#pragma parameter location_y "Viewport Y Pos." 0.5 0.0 1.0 0.05
+#pragma parameter in_res_x "Viewport Size X" 320.0 100.0 600.0 1.0
+#pragma parameter in_res_y "Viewport Size Y" 240.0 64.0 512.0 1.0
+#pragma parameter border_on_top "Show Viewport" 1.0 0.0 1.0 1.0
+
+layout(std140, set = 0, binding = 0) uniform UBO
+{
+   mat4 MVP;
+} global;
+
+#pragma stage vertex
+layout(location = 0) in vec4 Position;
+layout(location = 1) in vec2 TexCoord;
+layout(location = 0) out vec2 vTexCoord;
+layout(location = 1) out vec2 screen_coord;
+
+void main()
+{
+   gl_Position = global.MVP * Position;
+   vec2 corrected_size = vec2(params.in_res_x, params.in_res_y);
+   vec2 scale = (params.OutputSize.xy / corrected_size) / params.box_scale;
+   vec2 middle = vec2(params.location_x, params.location_y);
+   vec2 diff = TexCoord.xy - middle;
+   screen_coord = middle + diff * scale;
+   middle = vec2(0.4999, 0.4999);
+   vec2 dist = vTexCoord - middle;
+   vTexCoord = TexCoord * 0.25 * vec2(1.25, 1.0);
+}
+
+#pragma stage fragment
+layout(location = 0) in vec2 vTexCoord;
+layout(location = 1) in vec2 screen_coord;
+layout(location = 0) out vec4 FragColor;
+layout(set = 0, binding = 2) uniform sampler2D Source;
+layout(set = 0, binding = 3) uniform sampler2D Reference;
+
+void main()
+{
+vec4 screen = texture(Reference, screen_coord); //the main video screen
+vec4 background = texture(Source, vTexCoord + vec2(0.5)); //put your background function's output here
+if ( screen_coord.x < 0.9999 && screen_coord.x > 0.0001 && screen_coord.y < 0.9999 && screen_coord.y > 0.0001 && params.border_on_top > 0.5 )
+background.a *= 0.0;
+   FragColor = vec4(mix(screen, background, background.a));
+}