Add AGB-001 and AGS-001 LCD shaders ported from mGBA

handheld/agb001-gba-color-motionblur.slangp

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+shaders = 3
+
+shader0 = ../motionblur/shaders/response-time.slang
+filter_linear0 = false
+scale_type0 = source
+scale0 = 1.0
+
+shader1 = shaders/mgba/agb001.slang
+filter_linear1 = false
+scale_type1 = source
+scale1 = 4.0
+
+shader2 = shaders/color/gba-color.slang
+filter_linear2 = true
+scale_type2 = viewport

handheld/agb001.slangp

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+shaders = 2
+
+shader0 = shaders/mgba/agb001.slang
+filter_linear0 = false
+scale_type0 = source
+scale0 = 4.0
+
+shader1 = ../stock.slang
+filter_linear1 = true
+scale_type1 = viewport

handheld/ags001-gba-color-motionblur.slangp

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+shaders = 4
+
+shader0 = ../motionblur/shaders/response-time.slang
+filter_linear0 = false
+scale_type0 = source
+scale0 = 1.0
+
+shader1 = shaders/mgba/ags001.slang
+filter_linear1 = false
+scale_type1 = source
+scale1 = 4.0
+
+shader2 = shaders/color/gba-color.slang
+filter_linear2 = false
+scale_type2 = source
+scale2 = 1.0
+
+shader3 = shaders/mgba/ags001-light.slang
+filter_linear3 = true
+scale_type3 = viewport

handheld/ags001.slangp

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+shaders = 2
+
+shader0 = shaders/mgba/ags001.slang
+filter_linear0 = false
+scale_type0 = source
+scale0 = 4.0
+
+shader1 = shaders/mgba/ags001-light.slang
+filter_linear1 = true
+scale_type1 = viewport

handheld/shaders/mgba/agb001.slang

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+#version 450
+
+/*
+   AGB-001 shader
+   A glorious recreation of the original Game Boy Advance
+   Author: endrift
+   License: MPL 2.0
+
+   This Source Code Form is subject to the terms of the Mozilla Public
+   License, v. 2.0. If a copy of the MPL was not distributed with this
+   file, You can obtain one at http://mozilla.org/MPL/2.0/. 
+*/
+
+layout(std140, set = 0, binding = 0) uniform UBO
+{
+   mat4 MVP;
+   vec4 OutputSize;
+   vec4 OriginalSize;
+   vec4 SourceSize;
+} 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;
+   vTexCoord = TexCoord;
+}
+
+#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()
+{
+	vec4 color = texture(Source, vTexCoord);
+	vec3 arrayX[4];
+	arrayX[0] = vec3(1.0, 0.2, 0.2);
+	arrayX[1] = vec3(0.2, 1.0, 0.2);
+	arrayX[2] = vec3(0.2, 0.2, 1.0);
+	arrayX[3] = vec3(0.4, 0.4, 0.4);
+	vec3 arrayY[4];
+	arrayY[0] = vec3(1.0, 1.0, 1.0);
+	arrayY[1] = vec3(1.0, 1.0, 1.0);
+	arrayY[2] = vec3(1.0, 1.0, 1.0);
+	arrayY[3] = vec3(0.8, 0.8, 0.8);
+	color.rgb = pow(color.rgb * vec3(0.8, 0.8, 0.8), vec3(1.8, 1.8, 1.8)) + vec3(0.16, 0.16, 0.16);
+	color.rgb *= arrayX[int(mod(vTexCoord.s * global.SourceSize.x * 4.0, 4.0))];
+	color.rgb *= arrayY[int(mod(vTexCoord.t * global.SourceSize.y * 4.0, 4.0))];
+	color.a = 0.5;
+	FragColor = color;
+
+}

handheld/shaders/mgba/ags001-light.slang

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+#version 450
+
+/*
+   AGS-001 shader
+   A pristine recreation of the illuminated Game Boy Advance SP
+   Author: endrift
+   License: MPL 2.0
+
+   This Source Code Form is subject to the terms of the Mozilla Public
+   License, v. 2.0. If a copy of the MPL was not distributed with this
+   file, You can obtain one at http://mozilla.org/MPL/2.0/. 
+*/
+
+layout(std140, set = 0, binding = 0) uniform UBO
+{
+   mat4 MVP;
+   vec4 OutputSize;
+   vec4 OriginalSize;
+   vec4 SourceSize;
+} global;
+
+layout(push_constant) uniform Push
+{
+   float reflectionBrightness;
+   float reflectionDistanceX;
+   float reflectionDistanceY;
+   float lightBrightness;
+} params;
+
+#pragma parameter reflectionBrightness "Reflection brightness" 0.07 0.0 1.0 0.01
+#pragma parameter reflectionDistanceX "Reflection Distance X" 0.0 -1.0 1.0 0.005
+#pragma parameter reflectionDistanceY "Reflection Distance Y" 0.025 -1.0 1.0 0.005
+#pragma parameter lightBrightness "Light brightness" 1.0 0.0 1.0 0.01
+
+#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;
+   vTexCoord = TexCoord;
+}
+
+#pragma stage fragment
+layout(location = 0) in vec2 vTexCoord;
+layout(location = 0) out vec4 FragColor;
+layout(set = 0, binding = 2) uniform sampler2D Source;
+
+const float speed = 2.0;
+const float decay = 2.0;
+const float coeff = 2.5;
+
+void main()
+{
+     vec2 reflectionDistance = vec2(params.reflectionDistanceX,params.reflectionDistanceY);
+	float sp = pow(speed, params.lightBrightness);
+	float dc = pow(decay, -params.lightBrightness);
+	float s = (sp - dc) / (sp + dc);
+	vec2 radius = (vTexCoord.st - vec2(0.5, 0.5)) * vec2(coeff * s);
+	radius = pow(abs(radius), vec2(4.0));
+	vec3 bleed = vec3(0.12, 0.14, 0.19);
+	bleed += (dot(radius, radius) + vec3(0.02, 0.03, 0.05)) * vec3(0.14, 0.18, 0.2);
+
+	vec4 color = texture(Source, vTexCoord);
+	color.rgb += pow(bleed, pow(vec3(params.lightBrightness), vec3(-0.5)));
+
+	vec4 reflection = texture(Source, vTexCoord - reflectionDistance);
+	color.rgb += reflection.rgb * params.reflectionBrightness;
+	color.a = 1.0;
+     FragColor = color;
+
+}

handheld/shaders/mgba/ags001.slang

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+#version 450
+
+/*
+   AGS-001 shader
+   A pristine recreation of the illuminated Game Boy Advance SP
+   Author: endrift
+   License: MPL 2.0
+
+   This Source Code Form is subject to the terms of the Mozilla Public
+   License, v. 2.0. If a copy of the MPL was not distributed with this
+   file, You can obtain one at http://mozilla.org/MPL/2.0/. 
+*/
+
+layout(std140, set = 0, binding = 0) uniform UBO
+{
+   mat4 MVP;
+   vec4 OutputSize;
+   vec4 OriginalSize;
+   vec4 SourceSize;
+} 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;
+   vTexCoord = TexCoord;
+}
+
+#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()
+{
+	vec4 color = texture(Source, vTexCoord);
+	vec3 arrayX[4];
+	arrayX[0] = vec3(1.0, 0.2, 0.2);
+	arrayX[1] = vec3(0.2, 1.0, 0.2);
+	arrayX[2] = vec3(0.2, 0.2, 1.0);
+	arrayX[3] = vec3(0.4, 0.4, 0.4);
+	vec3 arrayY[4];
+	arrayY[0] = vec3(1.0, 1.0, 1.0);
+	arrayY[1] = vec3(1.0, 1.0, 1.0);
+	arrayY[2] = vec3(1.0, 1.0, 1.0);
+	arrayY[3] = vec3(0.9, 0.9, 0.9);
+	color.rgb = pow(color.rgb, vec3(1.6, 1.6, 1.6));
+	color.rgb *= arrayX[int(mod(vTexCoord.s * global.SourceSize.x * 4.0, 4.0))];
+	color.rgb *= arrayY[int(mod(vTexCoord.t * global.SourceSize.y * 4.0, 4.0))];
+	color.a = 0.8;
+	FragColor = color;
+
+}