add gbc console borders

handheld/console-border/gbc-2x.slangp

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+shaders = "2"
+
+shader0 = "../shaders/lcd-cgwg/lcd-grid.slang"
+filter_linear0 = "false"
+wrap_mode0 = "clamp_to_border"
+scale_type_x0 = "source"
+scale_x0 = "4.000000"
+scale_type_y0 = "source"
+scale_y0 = "4.000000"
+
+shader1 = "shader-files/border.slang"
+filter_linear1 = "true"
+wrap_mode1 = "clamp_to_border"
+
+parameters = "box_scale;in_res_x;in_res_y;border_zoom_x;border_zoom_y"
+GRID_STRENGTH = "0.050000"
+box_scale = "2.0"
+in_res_x = "160.0"
+in_res_y = "144.0"
+border_zoom_x = "1.05"
+border_zoom_y = "1.18"
+
+textures = "BORDER"
+BORDER = "resources/color-border-square-4x.png"
+BORDER_linear = "true"
+BORDER_wrap_mode = "clamp_to_border"
+BORDER_mipmap = "false"

handheld/console-border/gbc-3x.slangp

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+shaders = "2"
+
+shader0 = "../shaders/lcd-cgwg/lcd-grid.slang"
+filter_linear0 = "false"
+wrap_mode0 = "clamp_to_border"
+scale_type_x0 = "source"
+scale_x0 = "4.000000"
+scale_type_y0 = "source"
+scale_y0 = "4.000000"
+
+shader1 = "shader-files/border.slang"
+filter_linear1 = "true"
+wrap_mode1 = "clamp_to_border"
+
+parameters = "box_scale;in_res_x;in_res_y;border_zoom_x;border_zoom_y"
+GRID_STRENGTH = "0.050000"
+box_scale = "3.0"
+in_res_x = "160.0"
+in_res_y = "144.0"
+border_zoom_x = "0.70"
+border_zoom_y = "0.79"
+
+textures = "BORDER"
+BORDER = "resources/color-border-square-4x.png"
+BORDER_linear = "true"
+BORDER_wrap_mode = "clamp_to_border"
+BORDER_mipmap = "false"

handheld/console-border/gbc-4x.slangp

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+shaders = "2"
+
+shader0 = "../shaders/lcd-cgwg/lcd-grid.slang"
+filter_linear0 = "false"
+wrap_mode0 = "clamp_to_border"
+scale_type_x0 = "source"
+scale_x0 = "4.000000"
+scale_type_y0 = "source"
+scale_y0 = "4.000000"
+
+shader1 = "shader-files/border.slang"
+filter_linear1 = "true"
+wrap_mode1 = "clamp_to_border"
+
+parameters = "box_scale;in_res_x;in_res_y;border_zoom_x;border_zoom_y"
+GRID_STRENGTH = "0.050000"
+box_scale = "4.0"
+in_res_x = "160.0"
+in_res_y = "144.0"
+border_zoom_x = "0.52"
+border_zoom_y = "0.59"
+
+textures = "BORDER"
+BORDER = "resources/color-border-square-4x.png"
+BORDER_linear = "true"
+BORDER_wrap_mode = "clamp_to_border"
+BORDER_mipmap = "false"

handheld/console-border/gbc-5x.slangp

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+shaders = "2"
+
+shader0 = "../shaders/lcd-cgwg/lcd-grid.slang"
+filter_linear0 = "false"
+wrap_mode0 = "clamp_to_border"
+scale_type_x0 = "source"
+scale_x0 = "6.000000"
+scale_type_y0 = "source"
+scale_y0 = "6.000000"
+
+shader1 = "shader-files/border.slang"
+filter_linear1 = "true"
+wrap_mode1 = "clamp_to_border"
+
+parameters = "box_scale;in_res_x;in_res_y;border_zoom_x;border_zoom_y"
+GRID_STRENGTH = "0.050000"
+box_scale = "5.0"
+in_res_x = "160.0"
+in_res_y = "144.0"
+border_zoom_x = "0.42"
+border_zoom_y = "0.47"
+
+textures = "BORDER"
+BORDER = "resources/color-border-square-4x.png"
+BORDER_linear = "true"
+BORDER_wrap_mode = "clamp_to_border"
+BORDER_mipmap = "false"

handheld/console-border/gbc-6x.slangp

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+shaders = "2"
+
+shader0 = "../shaders/lcd-cgwg/lcd-grid.slang"
+filter_linear0 = "false"
+wrap_mode0 = "clamp_to_border"
+scale_type_x0 = "source"
+scale_x0 = "6.000000"
+scale_type_y0 = "source"
+scale_y0 = "6.000000"
+
+shader1 = "shader-files/border.slang"
+filter_linear1 = "true"
+wrap_mode1 = "clamp_to_border"
+
+parameters = "box_scale;in_res_x;in_res_y;border_zoom_x;border_zoom_y"
+GRID_STRENGTH = "0.050000"
+box_scale = "6.0"
+in_res_x = "160.0"
+in_res_y = "144.0"
+border_zoom_x = "0.35"
+border_zoom_y = "0.39"
+
+textures = "BORDER"
+BORDER = "resources/color-border-square-4x.png"
+BORDER_linear = "true"
+BORDER_wrap_mode = "clamp_to_border"
+BORDER_mipmap = "false"

handheld/console-border/shader-files/border.slang

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+#version 450
+
+// Created by inigo quilez - iq/2014
+// License Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License.
+// modified for slang border shader by hunterk
+
+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;
+	float border_zoom_x;
+	float border_zoom_y;
+} params;
+
+layout(std140, set = 0, binding = 0) uniform UBO
+{
+   mat4 MVP;
+} global;
+
+#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
+#pragma parameter border_zoom_x "Border Zoom X" 1.0 0.0 4.0 0.01
+#pragma parameter border_zoom_y "Border Zoom Y" 1.0 0.0 4.0 0.01
+
+#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);
+   vTexCoord = middle + diff * vec2(params.border_zoom_x, params.border_zoom_y);
+}
+
+#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 Original;
+layout(set = 0, binding = 4) uniform sampler2D BORDER;
+
+void main()
+{
+vec4 screen = texture(Source, screen_coord); //the main video screen
+vec4 background = vec4(texture(BORDER, vTexCoord)); //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));
+}