Add simpletex_lcd shaders

handheld/shaders/simpletex_lcd/png/readme.txt

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+All source image patterns downloaded from www.subtlepatterns.com

handheld/shaders/simpletex_lcd/simpletex_lcd+gba-color-4k.slang

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+#version 450
+
+/*
+	simpletex_lcd+gba-color - a simple, textured LCD shader intended for non-backlit
+	systems - includes GBA colour correction
+	
+	- Makes use of the 'line weighting' equation from zfast_lcd_standard
+	  [original zfast_lcd_standard code copyright (C) 2017 Greg Hogan (SoltanGris42)]
+	
+	- Colour correction code taken from 'gba-color', written by hunterk, modified by Pokefan531
+	  and realeased into the public domain
+	
+	Other code by jdgleaver
+	
+	Usage notes:
+	
+	- Background texture size is hard-coded (I can't find a way to get this
+	  automatically...). User must ensure that 'BG_TEXTURE_SIZE' define is
+	  set appropriately.
+	
+	- Adjustable parameters:
+	
+	  > GRID_INTENSITY: Sets overall visibility of grid effect
+	                    - 1.0: Grid is shown
+	                    - 0.0: Grid is invisible (same colour as pixels)
+	  > GRID_WIDTH: Sets effective with of grid lines
+	                - 1.0: Normal full width
+	                - 0.0: Minimum width
+	                       (Note - this does not mean zero width! Instead, this
+	                        is the minimum 'sane' width, below which the grid
+	                        becomes pointless...)
+	  > GRID_BIAS: Dynamically adjusts the grid intensity based on pixel luminosity
+	               - 0.0: Grid intensity is uniform
+	               - 1.0: Grid intensity scales linearly with pixel luminosity
+	                      > i.e. the darker the pixel, the less the grid effect
+	                        is apparent - black pixels exhibit no grid effect at all
+	  > DARKEN_GRID: Darkens grid (duh...)
+	                 - 0.0: Grid is white
+	                 - 1.0: Grid is black
+	  > DARKEN_COLOUR: Simply darkens pixel colours (effectively lowers gamma level of pixels)
+	                   - 0.0: Colours are normal
+	                   - 2.0: Colours are too dark...
+	
+	This program is free software; you can redistribute it and/or modify it
+	under the terms of the GNU General Public License as published by the Free
+	Software Foundation; either version 2 of the License, or (at your option)
+	any later version.
+*/
+
+// Background texture size
+// > 2048 x 2048 textures are suitable for screen resolutions up to
+//   1200p (or 1440p if running 'square' aspect ratio systems)
+//#define BG_TEXTURE_SIZE 2048.0
+// > 4096 x 4096 textures are suitable for screen resolutions up to 4k
+#define BG_TEXTURE_SIZE 4096.0
+
+#pragma parameter GRID_INTENSITY "Grid Intensity" 1.0 0.0 1.0 0.05
+#pragma parameter GRID_WIDTH "Grid Width" 1.0 0.0 1.0 0.05
+#pragma parameter GRID_BIAS "Grid Bias" 0.0 0.0 1.0 0.05
+#pragma parameter DARKEN_GRID "Darken Grid" 0.0 0.0 1.0 0.05
+#pragma parameter DARKEN_COLOUR "Darken Colours" 0.0 0.0 2.0 0.05
+
+layout(push_constant) uniform Push
+{
+	float GRID_INTENSITY;
+	float GRID_WIDTH;
+	float GRID_BIAS;
+	float DARKEN_GRID;
+	float DARKEN_COLOUR;
+	vec4 OutputSize;
+	vec4 OriginalSize;
+	vec4 SourceSize;
+} registers;
+
+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;
+
+/*
+    VERTEX_SHADER
+*/
+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;
+layout(set = 0, binding = 3) uniform sampler2D BACKGROUND;
+
+// ### Magic Numbers...
+
+// Grid pattern
+// > Line weighting equation:
+//   y = a * (x^4 - b * x^6)
+const float LINE_WEIGHT_A = 48.0;
+const float LINE_WEIGHT_B = 8.0 / 3.0;
+
+// RGB -> Luminosity conversion
+// > Photometric/digital ITU BT.709
+#define LUMA_R 0.2126
+#define LUMA_G 0.7152
+#define LUMA_B 0.0722
+// > Digital ITU BT.601
+//#define LUMA_R 0.299
+//#define LUMA_G 0.587
+//#define LUMA_B 0.114
+
+// Background texture size
+const float INV_BG_TEXTURE_SIZE = 1.0 / BG_TEXTURE_SIZE;
+
+// Colour correction
+#define CC_R 0.845
+#define CC_G 0.68
+#define CC_B 0.755
+#define CC_RG 0.09
+#define CC_RB 0.16
+#define CC_GR 0.17
+#define CC_GB 0.085
+#define CC_BR -0.015
+#define CC_BG 0.23
+
+/*
+    FRAGMENT SHADER
+*/
+void main()
+{
+	// Get current texture coordinate
+	vec2 imgPixelCoord = vTexCoord.xy * registers.SourceSize.xy;
+	vec2 imgCenterCoord = floor(imgPixelCoord.xy) + vec2(0.5, 0.5);
+	
+	// Get colour of current pixel
+	vec3 colour = texture(Source, registers.SourceSize.zw * imgCenterCoord.xy).rgb;
+	
+	// Darken colours (if required...)
+	colour.rgb = pow(colour.rgb, vec3(1.0 + registers.DARKEN_COLOUR));
+	
+	// Generate grid pattern...
+	vec2 distFromCenter = abs(imgCenterCoord.xy - imgPixelCoord.xy);
+	
+	float xSquared = max(distFromCenter.x, distFromCenter.y);
+	xSquared = xSquared * xSquared;
+	
+	float xQuarted = xSquared * xSquared;
+	
+	// > Line weighting equation:
+	//   y = 48 * (x^4 - (8/3) * x^6)
+	float lineWeight = LINE_WEIGHT_A * (xQuarted - (LINE_WEIGHT_B * xQuarted * xSquared));
+	
+	// > Apply grid adjustments (phase 1)
+	//   - GRID_WIDTH:
+	//        1.0: Use raw lineWeight value
+	//        0.0: Use lineWeight ^ 2 (makes lines thinner - realistically, this is
+	//                                 the thinnest we can go before the grid effect
+	//                                 becomes pointless, particularly with 'high resolution'
+	//                                 systems like the GBA)
+	//   - GRID_INTENSITY:
+	//        1.0: Grid lines are white
+	//        0.0: Grid lines are invisible
+	lineWeight = lineWeight * (lineWeight + ((1.0 - lineWeight) * registers.GRID_WIDTH)) * registers.GRID_INTENSITY;
+	
+	// > Apply grid adjustments (phase 2)
+	//   - GRID_BIAS:
+	//        0.0: Use 'unbiased' lineWeight value calculated above
+	//        1.0: Scale lineWeight by current pixel luminosity
+	//             > i.e. the darker the pixel, the lower the intensity of the grid
+	float luma = (LUMA_R * colour.r) + (LUMA_G * colour.g) + (LUMA_B * colour.b);
+	lineWeight = lineWeight * (luma + ((1.0 - luma) * (1.0 - registers.GRID_BIAS)));
+	
+	// Apply grid pattern
+	// (lineWeight == 1 -> set colour to value specified by DARKEN_GRID)
+	colour.rgb = mix(colour.rgb, vec3(1.0 - registers.DARKEN_GRID), lineWeight);
+	
+	// Apply colour correction
+	colour.rgb = mat3(CC_R,  CC_RG, CC_RB,
+							CC_GR, CC_G,  CC_GB,
+							CC_BR, CC_BG, CC_B) * colour.rgb;
+	colour.rgb = clamp(colour.rgb, 0.0, 1.0);
+	
+	// Get background sample point
+	// > NB: external texture coordinates are referenced in a completely different fashion
+	//   here than they are in GLSL shaders...
+	vec2 bgPixelCoord = floor(vTexCoord.xy * registers.OutputSize.xy) + vec2(0.5, 0.5);
+	
+	// Sample background texture and 'colourise' according to current pixel colour
+	// (NB: the 'colourisation' here is lame, but the proper method is slow...)
+	vec3 bgTexture = texture(BACKGROUND, bgPixelCoord.xy * INV_BG_TEXTURE_SIZE).rgb * colour.rgb;
+	
+	// Blend current pixel with background according to luminosity
+	// (lighter colour == more transparent, more visible background)
+	// Note: Have to calculate luminosity a second time... tiresome, but
+	// it's not a particulary expensive operation...
+	luma = (LUMA_R * colour.r) + (LUMA_G * colour.g) + (LUMA_B * colour.b);
+	colour.rgb = mix(colour.rgb, bgTexture.rgb, luma);
+	
+	FragColor = vec4(colour.rgb, 1.0);
+}

handheld/shaders/simpletex_lcd/simpletex_lcd+gba-color.slang

@@ -0,0 +1,208 @@
+#version 450
+
+/*
+	simpletex_lcd+gba-color - a simple, textured LCD shader intended for non-backlit
+	systems - includes GBA colour correction
+	
+	- Makes use of the 'line weighting' equation from zfast_lcd_standard
+	  [original zfast_lcd_standard code copyright (C) 2017 Greg Hogan (SoltanGris42)]
+	
+	- Colour correction code taken from 'gba-color', written by hunterk, modified by Pokefan531
+	  and realeased into the public domain
+	
+	Other code by jdgleaver
+	
+	Usage notes:
+	
+	- Background texture size is hard-coded (I can't find a way to get this
+	  automatically...). User must ensure that 'BG_TEXTURE_SIZE' define is
+	  set appropriately.
+	
+	- Adjustable parameters:
+	
+	  > GRID_INTENSITY: Sets overall visibility of grid effect
+	                    - 1.0: Grid is shown
+	                    - 0.0: Grid is invisible (same colour as pixels)
+	  > GRID_WIDTH: Sets effective with of grid lines
+	                - 1.0: Normal full width
+	                - 0.0: Minimum width
+	                       (Note - this does not mean zero width! Instead, this
+	                        is the minimum 'sane' width, below which the grid
+	                        becomes pointless...)
+	  > GRID_BIAS: Dynamically adjusts the grid intensity based on pixel luminosity
+	               - 0.0: Grid intensity is uniform
+	               - 1.0: Grid intensity scales linearly with pixel luminosity
+	                      > i.e. the darker the pixel, the less the grid effect
+	                        is apparent - black pixels exhibit no grid effect at all
+	  > DARKEN_GRID: Darkens grid (duh...)
+	                 - 0.0: Grid is white
+	                 - 1.0: Grid is black
+	  > DARKEN_COLOUR: Simply darkens pixel colours (effectively lowers gamma level of pixels)
+	                   - 0.0: Colours are normal
+	                   - 2.0: Colours are too dark...
+	
+	This program is free software; you can redistribute it and/or modify it
+	under the terms of the GNU General Public License as published by the Free
+	Software Foundation; either version 2 of the License, or (at your option)
+	any later version.
+*/
+
+// Background texture size
+// > 2048 x 2048 textures are suitable for screen resolutions up to
+//   1200p (or 1440p if running 'square' aspect ratio systems)
+#define BG_TEXTURE_SIZE 2048.0
+// > 4096 x 4096 textures are suitable for screen resolutions up to 4k
+//#define BG_TEXTURE_SIZE 4096.0
+
+#pragma parameter GRID_INTENSITY "Grid Intensity" 1.0 0.0 1.0 0.05
+#pragma parameter GRID_WIDTH "Grid Width" 1.0 0.0 1.0 0.05
+#pragma parameter GRID_BIAS "Grid Bias" 0.0 0.0 1.0 0.05
+#pragma parameter DARKEN_GRID "Darken Grid" 0.0 0.0 1.0 0.05
+#pragma parameter DARKEN_COLOUR "Darken Colours" 0.0 0.0 2.0 0.05
+
+layout(push_constant) uniform Push
+{
+	float GRID_INTENSITY;
+	float GRID_WIDTH;
+	float GRID_BIAS;
+	float DARKEN_GRID;
+	float DARKEN_COLOUR;
+	vec4 OutputSize;
+	vec4 OriginalSize;
+	vec4 SourceSize;
+} registers;
+
+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;
+
+/*
+    VERTEX_SHADER
+*/
+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;
+layout(set = 0, binding = 3) uniform sampler2D BACKGROUND;
+
+// ### Magic Numbers...
+
+// Grid pattern
+// > Line weighting equation:
+//   y = a * (x^4 - b * x^6)
+const float LINE_WEIGHT_A = 48.0;
+const float LINE_WEIGHT_B = 8.0 / 3.0;
+
+// RGB -> Luminosity conversion
+// > Photometric/digital ITU BT.709
+#define LUMA_R 0.2126
+#define LUMA_G 0.7152
+#define LUMA_B 0.0722
+// > Digital ITU BT.601
+//#define LUMA_R 0.299
+//#define LUMA_G 0.587
+//#define LUMA_B 0.114
+
+// Background texture size
+const float INV_BG_TEXTURE_SIZE = 1.0 / BG_TEXTURE_SIZE;
+
+// Colour correction
+#define CC_R 0.845
+#define CC_G 0.68
+#define CC_B 0.755
+#define CC_RG 0.09
+#define CC_RB 0.16
+#define CC_GR 0.17
+#define CC_GB 0.085
+#define CC_BR -0.015
+#define CC_BG 0.23
+
+/*
+    FRAGMENT SHADER
+*/
+void main()
+{
+	// Get current texture coordinate
+	vec2 imgPixelCoord = vTexCoord.xy * registers.SourceSize.xy;
+	vec2 imgCenterCoord = floor(imgPixelCoord.xy) + vec2(0.5, 0.5);
+	
+	// Get colour of current pixel
+	vec3 colour = texture(Source, registers.SourceSize.zw * imgCenterCoord.xy).rgb;
+	
+	// Darken colours (if required...)
+	colour.rgb = pow(colour.rgb, vec3(1.0 + registers.DARKEN_COLOUR));
+	
+	// Generate grid pattern...
+	vec2 distFromCenter = abs(imgCenterCoord.xy - imgPixelCoord.xy);
+	
+	float xSquared = max(distFromCenter.x, distFromCenter.y);
+	xSquared = xSquared * xSquared;
+	
+	float xQuarted = xSquared * xSquared;
+	
+	// > Line weighting equation:
+	//   y = 48 * (x^4 - (8/3) * x^6)
+	float lineWeight = LINE_WEIGHT_A * (xQuarted - (LINE_WEIGHT_B * xQuarted * xSquared));
+	
+	// > Apply grid adjustments (phase 1)
+	//   - GRID_WIDTH:
+	//        1.0: Use raw lineWeight value
+	//        0.0: Use lineWeight ^ 2 (makes lines thinner - realistically, this is
+	//                                 the thinnest we can go before the grid effect
+	//                                 becomes pointless, particularly with 'high resolution'
+	//                                 systems like the GBA)
+	//   - GRID_INTENSITY:
+	//        1.0: Grid lines are white
+	//        0.0: Grid lines are invisible
+	lineWeight = lineWeight * (lineWeight + ((1.0 - lineWeight) * registers.GRID_WIDTH)) * registers.GRID_INTENSITY;
+	
+	// > Apply grid adjustments (phase 2)
+	//   - GRID_BIAS:
+	//        0.0: Use 'unbiased' lineWeight value calculated above
+	//        1.0: Scale lineWeight by current pixel luminosity
+	//             > i.e. the darker the pixel, the lower the intensity of the grid
+	float luma = (LUMA_R * colour.r) + (LUMA_G * colour.g) + (LUMA_B * colour.b);
+	lineWeight = lineWeight * (luma + ((1.0 - luma) * (1.0 - registers.GRID_BIAS)));
+	
+	// Apply grid pattern
+	// (lineWeight == 1 -> set colour to value specified by DARKEN_GRID)
+	colour.rgb = mix(colour.rgb, vec3(1.0 - registers.DARKEN_GRID), lineWeight);
+	
+	// Apply colour correction
+	colour.rgb = mat3(CC_R,  CC_RG, CC_RB,
+							CC_GR, CC_G,  CC_GB,
+							CC_BR, CC_BG, CC_B) * colour.rgb;
+	colour.rgb = clamp(colour.rgb, 0.0, 1.0);
+	
+	// Get background sample point
+	// > NB: external texture coordinates are referenced in a completely different fashion
+	//   here than they are in GLSL shaders...
+	vec2 bgPixelCoord = floor(vTexCoord.xy * registers.OutputSize.xy) + vec2(0.5, 0.5);
+	
+	// Sample background texture and 'colourise' according to current pixel colour
+	// (NB: the 'colourisation' here is lame, but the proper method is slow...)
+	vec3 bgTexture = texture(BACKGROUND, bgPixelCoord.xy * INV_BG_TEXTURE_SIZE).rgb * colour.rgb;
+	
+	// Blend current pixel with background according to luminosity
+	// (lighter colour == more transparent, more visible background)
+	// Note: Have to calculate luminosity a second time... tiresome, but
+	// it's not a particulary expensive operation...
+	luma = (LUMA_R * colour.r) + (LUMA_G * colour.g) + (LUMA_B * colour.b);
+	colour.rgb = mix(colour.rgb, bgTexture.rgb, luma);
+	
+	FragColor = vec4(colour.rgb, 1.0);
+}

handheld/shaders/simpletex_lcd/simpletex_lcd+gbc-color-4k.slang

@@ -0,0 +1,208 @@
+#version 450
+
+/*
+	simpletex_lcd+gbc-color - a simple, textured LCD shader intended for non-backlit
+	systems - includes GBC colour correction
+	
+	- Makes use of the 'line weighting' equation from zfast_lcd_standard
+	  [original zfast_lcd_standard code copyright (C) 2017 Greg Hogan (SoltanGris42)]
+	
+	- Colour correction code taken from 'gbc-color', written by hunterk and realeased
+	  into the public domain
+	
+	Other code by jdgleaver
+	
+	Usage notes:
+	
+	- Background texture size is hard-coded (I can't find a way to get this
+	  automatically...). User must ensure that 'BG_TEXTURE_SIZE' define is
+	  set appropriately.
+	
+	- Adjustable parameters:
+	
+	  > GRID_INTENSITY: Sets overall visibility of grid effect
+	                    - 1.0: Grid is shown
+	                    - 0.0: Grid is invisible (same colour as pixels)
+	  > GRID_WIDTH: Sets effective with of grid lines
+	                - 1.0: Normal full width
+	                - 0.0: Minimum width
+	                       (Note - this does not mean zero width! Instead, this
+	                        is the minimum 'sane' width, below which the grid
+	                        becomes pointless...)
+	  > GRID_BIAS: Dynamically adjusts the grid intensity based on pixel luminosity
+	               - 0.0: Grid intensity is uniform
+	               - 1.0: Grid intensity scales linearly with pixel luminosity
+	                      > i.e. the darker the pixel, the less the grid effect
+	                        is apparent - black pixels exhibit no grid effect at all
+	  > DARKEN_GRID: Darkens grid (duh...)
+	                 - 0.0: Grid is white
+	                 - 1.0: Grid is black
+	  > DARKEN_COLOUR: Simply darkens pixel colours (effectively lowers gamma level of pixels)
+	                   - 0.0: Colours are normal
+	                   - 2.0: Colours are too dark...
+	
+	This program is free software; you can redistribute it and/or modify it
+	under the terms of the GNU General Public License as published by the Free
+	Software Foundation; either version 2 of the License, or (at your option)
+	any later version.
+*/
+
+// Background texture size
+// > 2048 x 2048 textures are suitable for screen resolutions up to
+//   1200p (or 1440p if running 'square' aspect ratio systems)
+//#define BG_TEXTURE_SIZE 2048.0
+// > 4096 x 4096 textures are suitable for screen resolutions up to 4k
+#define BG_TEXTURE_SIZE 4096.0
+
+#pragma parameter GRID_INTENSITY "Grid Intensity" 1.0 0.0 1.0 0.05
+#pragma parameter GRID_WIDTH "Grid Width" 1.0 0.0 1.0 0.05
+#pragma parameter GRID_BIAS "Grid Bias" 0.0 0.0 1.0 0.05
+#pragma parameter DARKEN_GRID "Darken Grid" 0.0 0.0 1.0 0.05
+#pragma parameter DARKEN_COLOUR "Darken Colours" 0.0 0.0 2.0 0.05
+
+layout(push_constant) uniform Push
+{
+	float GRID_INTENSITY;
+	float GRID_WIDTH;
+	float GRID_BIAS;
+	float DARKEN_GRID;
+	float DARKEN_COLOUR;
+	vec4 OutputSize;
+	vec4 OriginalSize;
+	vec4 SourceSize;
+} registers;
+
+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;
+
+/*
+    VERTEX_SHADER
+*/
+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;
+layout(set = 0, binding = 3) uniform sampler2D BACKGROUND;
+
+// ### Magic Numbers...
+
+// Grid pattern
+// > Line weighting equation:
+//   y = a * (x^4 - b * x^6)
+const float LINE_WEIGHT_A = 48.0;
+const float LINE_WEIGHT_B = 8.0 / 3.0;
+
+// RGB -> Luminosity conversion
+// > Photometric/digital ITU BT.709
+#define LUMA_R 0.2126
+#define LUMA_G 0.7152
+#define LUMA_B 0.0722
+// > Digital ITU BT.601
+//#define LUMA_R 0.299
+//#define LUMA_G 0.587
+//#define LUMA_B 0.114
+
+// Background texture size
+const float INV_BG_TEXTURE_SIZE = 1.0 / BG_TEXTURE_SIZE;
+
+// Colour correction
+#define CC_R 0.78824
+#define CC_G 0.72941
+#define CC_B 0.82
+#define CC_RG 0.025
+#define CC_RB 0.12039
+#define CC_GR 0.12157
+#define CC_GB 0.12157
+#define CC_BR 0.0
+#define CC_BG 0.275000
+
+/*
+    FRAGMENT SHADER
+*/
+void main()
+{
+	// Get current texture coordinate
+	vec2 imgPixelCoord = vTexCoord.xy * registers.SourceSize.xy;
+	vec2 imgCenterCoord = floor(imgPixelCoord.xy) + vec2(0.5, 0.5);
+	
+	// Get colour of current pixel
+	vec3 colour = texture(Source, registers.SourceSize.zw * imgCenterCoord.xy).rgb;
+	
+	// Darken colours (if required...)
+	colour.rgb = pow(colour.rgb, vec3(1.0 + registers.DARKEN_COLOUR));
+	
+	// Generate grid pattern...
+	vec2 distFromCenter = abs(imgCenterCoord.xy - imgPixelCoord.xy);
+	
+	float xSquared = max(distFromCenter.x, distFromCenter.y);
+	xSquared = xSquared * xSquared;
+	
+	float xQuarted = xSquared * xSquared;
+	
+	// > Line weighting equation:
+	//   y = 48 * (x^4 - (8/3) * x^6)
+	float lineWeight = LINE_WEIGHT_A * (xQuarted - (LINE_WEIGHT_B * xQuarted * xSquared));
+	
+	// > Apply grid adjustments (phase 1)
+	//   - GRID_WIDTH:
+	//        1.0: Use raw lineWeight value
+	//        0.0: Use lineWeight ^ 2 (makes lines thinner - realistically, this is
+	//                                 the thinnest we can go before the grid effect
+	//                                 becomes pointless, particularly with 'high resolution'
+	//                                 systems like the GBA)
+	//   - GRID_INTENSITY:
+	//        1.0: Grid lines are white
+	//        0.0: Grid lines are invisible
+	lineWeight = lineWeight * (lineWeight + ((1.0 - lineWeight) * registers.GRID_WIDTH)) * registers.GRID_INTENSITY;
+	
+	// > Apply grid adjustments (phase 2)
+	//   - GRID_BIAS:
+	//        0.0: Use 'unbiased' lineWeight value calculated above
+	//        1.0: Scale lineWeight by current pixel luminosity
+	//             > i.e. the darker the pixel, the lower the intensity of the grid
+	float luma = (LUMA_R * colour.r) + (LUMA_G * colour.g) + (LUMA_B * colour.b);
+	lineWeight = lineWeight * (luma + ((1.0 - luma) * (1.0 - registers.GRID_BIAS)));
+	
+	// Apply grid pattern
+	// (lineWeight == 1 -> set colour to value specified by DARKEN_GRID)
+	colour.rgb = mix(colour.rgb, vec3(1.0 - registers.DARKEN_GRID), lineWeight);
+	
+	// Apply colour correction
+	colour.rgb = mat3(CC_R,  CC_RG, CC_RB,
+							CC_GR, CC_G,  CC_GB,
+							CC_BR, CC_BG, CC_B) * colour.rgb;
+	colour.rgb = clamp(colour.rgb, 0.0, 1.0);
+	
+	// Get background sample point
+	// > NB: external texture coordinates are referenced in a completely different fashion
+	//   here than they are in GLSL shaders...
+	vec2 bgPixelCoord = floor(vTexCoord.xy * registers.OutputSize.xy) + vec2(0.5, 0.5);
+	
+	// Sample background texture and 'colourise' according to current pixel colour
+	// (NB: the 'colourisation' here is lame, but the proper method is slow...)
+	vec3 bgTexture = texture(BACKGROUND, bgPixelCoord.xy * INV_BG_TEXTURE_SIZE).rgb * colour.rgb;
+	
+	// Blend current pixel with background according to luminosity
+	// (lighter colour == more transparent, more visible background)
+	// Note: Have to calculate luminosity a second time... tiresome, but
+	// it's not a particulary expensive operation...
+	luma = (LUMA_R * colour.r) + (LUMA_G * colour.g) + (LUMA_B * colour.b);
+	colour.rgb = mix(colour.rgb, bgTexture.rgb, luma);
+	
+	FragColor = vec4(colour.rgb, 1.0);
+}

handheld/shaders/simpletex_lcd/simpletex_lcd+gbc-color.slang

@@ -0,0 +1,208 @@
+#version 450
+
+/*
+	simpletex_lcd+gbc-color - a simple, textured LCD shader intended for non-backlit
+	systems - includes GBC colour correction
+	
+	- Makes use of the 'line weighting' equation from zfast_lcd_standard
+	  [original zfast_lcd_standard code copyright (C) 2017 Greg Hogan (SoltanGris42)]
+	
+	- Colour correction code taken from 'gbc-color', written by hunterk and realeased
+	  into the public domain
+	
+	Other code by jdgleaver
+	
+	Usage notes:
+	
+	- Background texture size is hard-coded (I can't find a way to get this
+	  automatically...). User must ensure that 'BG_TEXTURE_SIZE' define is
+	  set appropriately.
+	
+	- Adjustable parameters:
+	
+	  > GRID_INTENSITY: Sets overall visibility of grid effect
+	                    - 1.0: Grid is shown
+	                    - 0.0: Grid is invisible (same colour as pixels)
+	  > GRID_WIDTH: Sets effective with of grid lines
+	                - 1.0: Normal full width
+	                - 0.0: Minimum width
+	                       (Note - this does not mean zero width! Instead, this
+	                        is the minimum 'sane' width, below which the grid
+	                        becomes pointless...)
+	  > GRID_BIAS: Dynamically adjusts the grid intensity based on pixel luminosity
+	               - 0.0: Grid intensity is uniform
+	               - 1.0: Grid intensity scales linearly with pixel luminosity
+	                      > i.e. the darker the pixel, the less the grid effect
+	                        is apparent - black pixels exhibit no grid effect at all
+	  > DARKEN_GRID: Darkens grid (duh...)
+	                 - 0.0: Grid is white
+	                 - 1.0: Grid is black
+	  > DARKEN_COLOUR: Simply darkens pixel colours (effectively lowers gamma level of pixels)
+	                   - 0.0: Colours are normal
+	                   - 2.0: Colours are too dark...
+	
+	This program is free software; you can redistribute it and/or modify it
+	under the terms of the GNU General Public License as published by the Free
+	Software Foundation; either version 2 of the License, or (at your option)
+	any later version.
+*/
+
+// Background texture size
+// > 2048 x 2048 textures are suitable for screen resolutions up to
+//   1200p (or 1440p if running 'square' aspect ratio systems)
+#define BG_TEXTURE_SIZE 2048.0
+// > 4096 x 4096 textures are suitable for screen resolutions up to 4k
+//#define BG_TEXTURE_SIZE 4096.0
+
+#pragma parameter GRID_INTENSITY "Grid Intensity" 1.0 0.0 1.0 0.05
+#pragma parameter GRID_WIDTH "Grid Width" 1.0 0.0 1.0 0.05
+#pragma parameter GRID_BIAS "Grid Bias" 0.0 0.0 1.0 0.05
+#pragma parameter DARKEN_GRID "Darken Grid" 0.0 0.0 1.0 0.05
+#pragma parameter DARKEN_COLOUR "Darken Colours" 0.0 0.0 2.0 0.05
+
+layout(push_constant) uniform Push
+{
+	float GRID_INTENSITY;
+	float GRID_WIDTH;
+	float GRID_BIAS;
+	float DARKEN_GRID;
+	float DARKEN_COLOUR;
+	vec4 OutputSize;
+	vec4 OriginalSize;
+	vec4 SourceSize;
+} registers;
+
+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;
+
+/*
+    VERTEX_SHADER
+*/
+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;
+layout(set = 0, binding = 3) uniform sampler2D BACKGROUND;
+
+// ### Magic Numbers...
+
+// Grid pattern
+// > Line weighting equation:
+//   y = a * (x^4 - b * x^6)
+const float LINE_WEIGHT_A = 48.0;
+const float LINE_WEIGHT_B = 8.0 / 3.0;
+
+// RGB -> Luminosity conversion
+// > Photometric/digital ITU BT.709
+#define LUMA_R 0.2126
+#define LUMA_G 0.7152
+#define LUMA_B 0.0722
+// > Digital ITU BT.601
+//#define LUMA_R 0.299
+//#define LUMA_G 0.587
+//#define LUMA_B 0.114
+
+// Background texture size
+const float INV_BG_TEXTURE_SIZE = 1.0 / BG_TEXTURE_SIZE;
+
+// Colour correction
+#define CC_R 0.78824
+#define CC_G 0.72941
+#define CC_B 0.82
+#define CC_RG 0.025
+#define CC_RB 0.12039
+#define CC_GR 0.12157
+#define CC_GB 0.12157
+#define CC_BR 0.0
+#define CC_BG 0.275000
+
+/*
+    FRAGMENT SHADER
+*/
+void main()
+{
+	// Get current texture coordinate
+	vec2 imgPixelCoord = vTexCoord.xy * registers.SourceSize.xy;
+	vec2 imgCenterCoord = floor(imgPixelCoord.xy) + vec2(0.5, 0.5);
+	
+	// Get colour of current pixel
+	vec3 colour = texture(Source, registers.SourceSize.zw * imgCenterCoord.xy).rgb;
+	
+	// Darken colours (if required...)
+	colour.rgb = pow(colour.rgb, vec3(1.0 + registers.DARKEN_COLOUR));
+	
+	// Generate grid pattern...
+	vec2 distFromCenter = abs(imgCenterCoord.xy - imgPixelCoord.xy);
+	
+	float xSquared = max(distFromCenter.x, distFromCenter.y);
+	xSquared = xSquared * xSquared;
+	
+	float xQuarted = xSquared * xSquared;
+	
+	// > Line weighting equation:
+	//   y = 48 * (x^4 - (8/3) * x^6)
+	float lineWeight = LINE_WEIGHT_A * (xQuarted - (LINE_WEIGHT_B * xQuarted * xSquared));
+	
+	// > Apply grid adjustments (phase 1)
+	//   - GRID_WIDTH:
+	//        1.0: Use raw lineWeight value
+	//        0.0: Use lineWeight ^ 2 (makes lines thinner - realistically, this is
+	//                                 the thinnest we can go before the grid effect
+	//                                 becomes pointless, particularly with 'high resolution'
+	//                                 systems like the GBA)
+	//   - GRID_INTENSITY:
+	//        1.0: Grid lines are white
+	//        0.0: Grid lines are invisible
+	lineWeight = lineWeight * (lineWeight + ((1.0 - lineWeight) * registers.GRID_WIDTH)) * registers.GRID_INTENSITY;
+	
+	// > Apply grid adjustments (phase 2)
+	//   - GRID_BIAS:
+	//        0.0: Use 'unbiased' lineWeight value calculated above
+	//        1.0: Scale lineWeight by current pixel luminosity
+	//             > i.e. the darker the pixel, the lower the intensity of the grid
+	float luma = (LUMA_R * colour.r) + (LUMA_G * colour.g) + (LUMA_B * colour.b);
+	lineWeight = lineWeight * (luma + ((1.0 - luma) * (1.0 - registers.GRID_BIAS)));
+	
+	// Apply grid pattern
+	// (lineWeight == 1 -> set colour to value specified by DARKEN_GRID)
+	colour.rgb = mix(colour.rgb, vec3(1.0 - registers.DARKEN_GRID), lineWeight);
+	
+	// Apply colour correction
+	colour.rgb = mat3(CC_R,  CC_RG, CC_RB,
+							CC_GR, CC_G,  CC_GB,
+							CC_BR, CC_BG, CC_B) * colour.rgb;
+	colour.rgb = clamp(colour.rgb, 0.0, 1.0);
+	
+	// Get background sample point
+	// > NB: external texture coordinates are referenced in a completely different fashion
+	//   here than they are in GLSL shaders...
+	vec2 bgPixelCoord = floor(vTexCoord.xy * registers.OutputSize.xy) + vec2(0.5, 0.5);
+	
+	// Sample background texture and 'colourise' according to current pixel colour
+	// (NB: the 'colourisation' here is lame, but the proper method is slow...)
+	vec3 bgTexture = texture(BACKGROUND, bgPixelCoord.xy * INV_BG_TEXTURE_SIZE).rgb * colour.rgb;
+	
+	// Blend current pixel with background according to luminosity
+	// (lighter colour == more transparent, more visible background)
+	// Note: Have to calculate luminosity a second time... tiresome, but
+	// it's not a particulary expensive operation...
+	luma = (LUMA_R * colour.r) + (LUMA_G * colour.g) + (LUMA_B * colour.b);
+	colour.rgb = mix(colour.rgb, bgTexture.rgb, luma);
+	
+	FragColor = vec4(colour.rgb, 1.0);
+}

handheld/shaders/simpletex_lcd/simpletex_lcd-4k.slang

@@ -0,0 +1,187 @@
+#version 450
+
+/*
+	simpletex_lcd - a simple, textured LCD shader intended for non-backlit systems
+	
+	- Makes use of the 'line weighting' equation from zfast_lcd_standard
+	  [original zfast_lcd_standard code copyright (C) 2017 Greg Hogan (SoltanGris42)]
+	
+	Other code by jdgleaver
+	
+	Usage notes:
+	
+	- Background texture size is hard-coded (I can't find a way to get this
+	  automatically...). User must ensure that 'BG_TEXTURE_SIZE' define is
+	  set appropriately.
+	
+	- Adjustable parameters:
+	
+	  > GRID_INTENSITY: Sets overall visibility of grid effect
+	                    - 1.0: Grid is shown
+	                    - 0.0: Grid is invisible (same colour as pixels)
+	  > GRID_WIDTH: Sets effective with of grid lines
+	                - 1.0: Normal full width
+	                - 0.0: Minimum width
+	                       (Note - this does not mean zero width! Instead, this
+	                        is the minimum 'sane' width, below which the grid
+	                        becomes pointless...)
+	  > GRID_BIAS: Dynamically adjusts the grid intensity based on pixel luminosity
+	               - 0.0: Grid intensity is uniform
+	               - 1.0: Grid intensity scales linearly with pixel luminosity
+	                      > i.e. the darker the pixel, the less the grid effect
+	                        is apparent - black pixels exhibit no grid effect at all
+	  > DARKEN_GRID: Darkens grid (duh...)
+	                 - 0.0: Grid is white
+	                 - 1.0: Grid is black
+	  > DARKEN_COLOUR: Simply darkens pixel colours (effectively lowers gamma level of pixels)
+	                   - 0.0: Colours are normal
+	                   - 2.0: Colours are too dark...
+	
+	This program is free software; you can redistribute it and/or modify it
+	under the terms of the GNU General Public License as published by the Free
+	Software Foundation; either version 2 of the License, or (at your option)
+	any later version.
+*/
+
+// Background texture size
+// > 2048 x 2048 textures are suitable for screen resolutions up to
+//   1200p (or 1440p if running 'square' aspect ratio systems)
+//#define BG_TEXTURE_SIZE 2048.0
+// > 4096 x 4096 textures are suitable for screen resolutions up to 4k
+#define BG_TEXTURE_SIZE 4096.0
+
+#pragma parameter GRID_INTENSITY "Grid Intensity" 1.0 0.0 1.0 0.05
+#pragma parameter GRID_WIDTH "Grid Width" 1.0 0.0 1.0 0.05
+#pragma parameter GRID_BIAS "Grid Bias" 0.0 0.0 1.0 0.05
+#pragma parameter DARKEN_GRID "Darken Grid" 0.0 0.0 1.0 0.05
+#pragma parameter DARKEN_COLOUR "Darken Colours" 0.0 0.0 2.0 0.05
+
+layout(push_constant) uniform Push
+{
+	float GRID_INTENSITY;
+	float GRID_WIDTH;
+	float GRID_BIAS;
+	float DARKEN_GRID;
+	float DARKEN_COLOUR;
+	vec4 OutputSize;
+	vec4 OriginalSize;
+	vec4 SourceSize;
+} registers;
+
+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;
+
+/*
+    VERTEX_SHADER
+*/
+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;
+layout(set = 0, binding = 3) uniform sampler2D BACKGROUND;
+
+// ### Magic Numbers...
+
+// Grid pattern
+// > Line weighting equation:
+//   y = a * (x^4 - b * x^6)
+const float LINE_WEIGHT_A = 48.0;
+const float LINE_WEIGHT_B = 8.0 / 3.0;
+
+// RGB -> Luminosity conversion
+// > Photometric/digital ITU BT.709
+#define LUMA_R 0.2126
+#define LUMA_G 0.7152
+#define LUMA_B 0.0722
+// > Digital ITU BT.601
+//#define LUMA_R 0.299
+//#define LUMA_G 0.587
+//#define LUMA_B 0.114
+
+// Background texture size
+const float INV_BG_TEXTURE_SIZE = 1.0 / BG_TEXTURE_SIZE;
+
+/*
+    FRAGMENT SHADER
+*/
+void main()
+{
+	// Get current texture coordinate
+	vec2 imgPixelCoord = vTexCoord.xy * registers.SourceSize.xy;
+	vec2 imgCenterCoord = floor(imgPixelCoord.xy) + vec2(0.5, 0.5);
+	
+	// Get colour of current pixel
+	vec3 colour = texture(Source, registers.SourceSize.zw * imgCenterCoord.xy).rgb;
+	
+	// Darken colours (if required...)
+	colour.rgb = pow(colour.rgb, vec3(1.0 + registers.DARKEN_COLOUR));
+	
+	// Generate grid pattern...
+	vec2 distFromCenter = abs(imgCenterCoord.xy - imgPixelCoord.xy);
+	
+	float xSquared = max(distFromCenter.x, distFromCenter.y);
+	xSquared = xSquared * xSquared;
+	
+	float xQuarted = xSquared * xSquared;
+	
+	// > Line weighting equation:
+	//   y = 48 * (x^4 - (8/3) * x^6)
+	float lineWeight = LINE_WEIGHT_A * (xQuarted - (LINE_WEIGHT_B * xQuarted * xSquared));
+	
+	// > Apply grid adjustments (phase 1)
+	//   - GRID_WIDTH:
+	//        1.0: Use raw lineWeight value
+	//        0.0: Use lineWeight ^ 2 (makes lines thinner - realistically, this is
+	//                                 the thinnest we can go before the grid effect
+	//                                 becomes pointless, particularly with 'high resolution'
+	//                                 systems like the GBA)
+	//   - GRID_INTENSITY:
+	//        1.0: Grid lines are white
+	//        0.0: Grid lines are invisible
+	lineWeight = lineWeight * (lineWeight + ((1.0 - lineWeight) * registers.GRID_WIDTH)) * registers.GRID_INTENSITY;
+	
+	// > Apply grid adjustments (phase 2)
+	//   - GRID_BIAS:
+	//        0.0: Use 'unbiased' lineWeight value calculated above
+	//        1.0: Scale lineWeight by current pixel luminosity
+	//             > i.e. the darker the pixel, the lower the intensity of the grid
+	float luma = (LUMA_R * colour.r) + (LUMA_G * colour.g) + (LUMA_B * colour.b);
+	lineWeight = lineWeight * (luma + ((1.0 - luma) * (1.0 - registers.GRID_BIAS)));
+	
+	// Apply grid pattern
+	// (lineWeight == 1 -> set colour to value specified by DARKEN_GRID)
+	colour.rgb = mix(colour.rgb, vec3(1.0 - registers.DARKEN_GRID), lineWeight);
+	
+	// Get background sample point
+	// > NB: external texture coordinates are referenced in a completely different fashion
+	//   here than they are in GLSL shaders...
+	vec2 bgPixelCoord = floor(vTexCoord.xy * registers.OutputSize.xy) + vec2(0.5, 0.5);
+	
+	// Sample background texture and 'colourise' according to current pixel colour
+	// (NB: the 'colourisation' here is lame, but the proper method is slow...)
+	vec3 bgTexture = texture(BACKGROUND, bgPixelCoord.xy * INV_BG_TEXTURE_SIZE).rgb * colour.rgb;
+	
+	// Blend current pixel with background according to luminosity
+	// (lighter colour == more transparent, more visible background)
+	// Note: Have to calculate luminosity a second time... tiresome, but
+	// it's not a particulary expensive operation...
+	luma = (LUMA_R * colour.r) + (LUMA_G * colour.g) + (LUMA_B * colour.b);
+	colour.rgb = mix(colour.rgb, bgTexture.rgb, luma);
+	
+	FragColor = vec4(colour.rgb, 1.0);
+}

handheld/shaders/simpletex_lcd/simpletex_lcd.slang

@@ -0,0 +1,187 @@
+#version 450
+
+/*
+	simpletex_lcd - a simple, textured LCD shader intended for non-backlit systems
+	
+	- Makes use of the 'line weighting' equation from zfast_lcd_standard
+	  [original zfast_lcd_standard code copyright (C) 2017 Greg Hogan (SoltanGris42)]
+	
+	Other code by jdgleaver
+	
+	Usage notes:
+	
+	- Background texture size is hard-coded (I can't find a way to get this
+	  automatically...). User must ensure that 'BG_TEXTURE_SIZE' define is
+	  set appropriately.
+	
+	- Adjustable parameters:
+	
+	  > GRID_INTENSITY: Sets overall visibility of grid effect
+	                    - 1.0: Grid is shown
+	                    - 0.0: Grid is invisible (same colour as pixels)
+	  > GRID_WIDTH: Sets effective with of grid lines
+	                - 1.0: Normal full width
+	                - 0.0: Minimum width
+	                       (Note - this does not mean zero width! Instead, this
+	                        is the minimum 'sane' width, below which the grid
+	                        becomes pointless...)
+	  > GRID_BIAS: Dynamically adjusts the grid intensity based on pixel luminosity
+	               - 0.0: Grid intensity is uniform
+	               - 1.0: Grid intensity scales linearly with pixel luminosity
+	                      > i.e. the darker the pixel, the less the grid effect
+	                        is apparent - black pixels exhibit no grid effect at all
+	  > DARKEN_GRID: Darkens grid (duh...)
+	                 - 0.0: Grid is white
+	                 - 1.0: Grid is black
+	  > DARKEN_COLOUR: Simply darkens pixel colours (effectively lowers gamma level of pixels)
+	                   - 0.0: Colours are normal
+	                   - 2.0: Colours are too dark...
+	
+	This program is free software; you can redistribute it and/or modify it
+	under the terms of the GNU General Public License as published by the Free
+	Software Foundation; either version 2 of the License, or (at your option)
+	any later version.
+*/
+
+// Background texture size
+// > 2048 x 2048 textures are suitable for screen resolutions up to
+//   1200p (or 1440p if running 'square' aspect ratio systems)
+#define BG_TEXTURE_SIZE 2048.0
+// > 4096 x 4096 textures are suitable for screen resolutions up to 4k
+//#define BG_TEXTURE_SIZE 4096.0
+
+#pragma parameter GRID_INTENSITY "Grid Intensity" 1.0 0.0 1.0 0.05
+#pragma parameter GRID_WIDTH "Grid Width" 1.0 0.0 1.0 0.05
+#pragma parameter GRID_BIAS "Grid Bias" 0.0 0.0 1.0 0.05
+#pragma parameter DARKEN_GRID "Darken Grid" 0.0 0.0 1.0 0.05
+#pragma parameter DARKEN_COLOUR "Darken Colours" 0.0 0.0 2.0 0.05
+
+layout(push_constant) uniform Push
+{
+	float GRID_INTENSITY;
+	float GRID_WIDTH;
+	float GRID_BIAS;
+	float DARKEN_GRID;
+	float DARKEN_COLOUR;
+	vec4 OutputSize;
+	vec4 OriginalSize;
+	vec4 SourceSize;
+} registers;
+
+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;
+
+/*
+    VERTEX_SHADER
+*/
+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;
+layout(set = 0, binding = 3) uniform sampler2D BACKGROUND;
+
+// ### Magic Numbers...
+
+// Grid pattern
+// > Line weighting equation:
+//   y = a * (x^4 - b * x^6)
+const float LINE_WEIGHT_A = 48.0;
+const float LINE_WEIGHT_B = 8.0 / 3.0;
+
+// RGB -> Luminosity conversion
+// > Photometric/digital ITU BT.709
+#define LUMA_R 0.2126
+#define LUMA_G 0.7152
+#define LUMA_B 0.0722
+// > Digital ITU BT.601
+//#define LUMA_R 0.299
+//#define LUMA_G 0.587
+//#define LUMA_B 0.114
+
+// Background texture size
+const float INV_BG_TEXTURE_SIZE = 1.0 / BG_TEXTURE_SIZE;
+
+/*
+    FRAGMENT SHADER
+*/
+void main()
+{
+	// Get current texture coordinate
+	vec2 imgPixelCoord = vTexCoord.xy * registers.SourceSize.xy;
+	vec2 imgCenterCoord = floor(imgPixelCoord.xy) + vec2(0.5, 0.5);
+	
+	// Get colour of current pixel
+	vec3 colour = texture(Source, registers.SourceSize.zw * imgCenterCoord.xy).rgb;
+	
+	// Darken colours (if required...)
+	colour.rgb = pow(colour.rgb, vec3(1.0 + registers.DARKEN_COLOUR));
+	
+	// Generate grid pattern...
+	vec2 distFromCenter = abs(imgCenterCoord.xy - imgPixelCoord.xy);
+	
+	float xSquared = max(distFromCenter.x, distFromCenter.y);
+	xSquared = xSquared * xSquared;
+	
+	float xQuarted = xSquared * xSquared;
+	
+	// > Line weighting equation:
+	//   y = 48 * (x^4 - (8/3) * x^6)
+	float lineWeight = LINE_WEIGHT_A * (xQuarted - (LINE_WEIGHT_B * xQuarted * xSquared));
+	
+	// > Apply grid adjustments (phase 1)
+	//   - GRID_WIDTH:
+	//        1.0: Use raw lineWeight value
+	//        0.0: Use lineWeight ^ 2 (makes lines thinner - realistically, this is
+	//                                 the thinnest we can go before the grid effect
+	//                                 becomes pointless, particularly with 'high resolution'
+	//                                 systems like the GBA)
+	//   - GRID_INTENSITY:
+	//        1.0: Grid lines are white
+	//        0.0: Grid lines are invisible
+	lineWeight = lineWeight * (lineWeight + ((1.0 - lineWeight) * registers.GRID_WIDTH)) * registers.GRID_INTENSITY;
+	
+	// > Apply grid adjustments (phase 2)
+	//   - GRID_BIAS:
+	//        0.0: Use 'unbiased' lineWeight value calculated above
+	//        1.0: Scale lineWeight by current pixel luminosity
+	//             > i.e. the darker the pixel, the lower the intensity of the grid
+	float luma = (LUMA_R * colour.r) + (LUMA_G * colour.g) + (LUMA_B * colour.b);
+	lineWeight = lineWeight * (luma + ((1.0 - luma) * (1.0 - registers.GRID_BIAS)));
+	
+	// Apply grid pattern
+	// (lineWeight == 1 -> set colour to value specified by DARKEN_GRID)
+	colour.rgb = mix(colour.rgb, vec3(1.0 - registers.DARKEN_GRID), lineWeight);
+	
+	// Get background sample point
+	// > NB: external texture coordinates are referenced in a completely different fashion
+	//   here than they are in GLSL shaders...
+	vec2 bgPixelCoord = floor(vTexCoord.xy * registers.OutputSize.xy) + vec2(0.5, 0.5);
+	
+	// Sample background texture and 'colourise' according to current pixel colour
+	// (NB: the 'colourisation' here is lame, but the proper method is slow...)
+	vec3 bgTexture = texture(BACKGROUND, bgPixelCoord.xy * INV_BG_TEXTURE_SIZE).rgb * colour.rgb;
+	
+	// Blend current pixel with background according to luminosity
+	// (lighter colour == more transparent, more visible background)
+	// Note: Have to calculate luminosity a second time... tiresome, but
+	// it's not a particulary expensive operation...
+	luma = (LUMA_R * colour.r) + (LUMA_G * colour.g) + (LUMA_B * colour.b);
+	colour.rgb = mix(colour.rgb, bgTexture.rgb, luma);
+	
+	FragColor = vec4(colour.rgb, 1.0);
+}

handheld/simpletex_lcd+gba-color-4k.slangp

@@ -0,0 +1,21 @@
+shaders = "1"
+
+shader0 = "shaders/simpletex_lcd/simpletex_lcd+gba-color-4k.slang"
+
+filter_linear0 = "true"
+wrap_mode0 = "clamp_to_border"
+mipmap_input0 = "false"
+alias0 = ""
+float_framebuffer0 = "false"
+srgb_framebuffer0 = "false"
+
+textures = "BACKGROUND"
+BACKGROUND = "shaders/simpletex_lcd/png/4k/textured_paper.png"
+BACKGROUND_linear = false
+
+parameters = "GRID_INTENSITY;GRID_WIDTH;GRID_BIAS;DARKEN_GRID;DARKEN_COLOUR"
+GRID_INTENSITY = "0.9"
+GRID_WIDTH = "0.6"
+GRID_BIAS = "0.65"
+DARKEN_GRID = "0.0"
+DARKEN_COLOUR = "0.4"

handheld/simpletex_lcd+gba-color.slangp

@@ -0,0 +1,21 @@
+shaders = "1"
+
+shader0 = "shaders/simpletex_lcd/simpletex_lcd+gba-color.slang"
+
+filter_linear0 = "true"
+wrap_mode0 = "clamp_to_border"
+mipmap_input0 = "false"
+alias0 = ""
+float_framebuffer0 = "false"
+srgb_framebuffer0 = "false"
+
+textures = "BACKGROUND"
+BACKGROUND = "shaders/simpletex_lcd/png/2k/textured_paper.png"
+BACKGROUND_linear = false
+
+parameters = "GRID_INTENSITY;GRID_WIDTH;GRID_BIAS;DARKEN_GRID;DARKEN_COLOUR"
+GRID_INTENSITY = "0.9"
+GRID_WIDTH = "0.6"
+GRID_BIAS = "0.65"
+DARKEN_GRID = "0.0"
+DARKEN_COLOUR = "0.4"

handheld/simpletex_lcd+gbc-color-4k.slangp

@@ -0,0 +1,21 @@
+shaders = "1"
+
+shader0 = "shaders/simpletex_lcd/simpletex_lcd+gbc-color-4k.slang"
+
+filter_linear0 = "true"
+wrap_mode0 = "clamp_to_border"
+mipmap_input0 = "false"
+alias0 = ""
+float_framebuffer0 = "false"
+srgb_framebuffer0 = "false"
+
+textures = "BACKGROUND"
+BACKGROUND = "shaders/simpletex_lcd/png/4k/textured_paper.png"
+BACKGROUND_linear = false
+
+parameters = "GRID_INTENSITY;GRID_WIDTH;GRID_BIAS;DARKEN_GRID;DARKEN_COLOUR"
+GRID_INTENSITY = "1.0"
+GRID_WIDTH = "0.9"
+GRID_BIAS = "0.65"
+DARKEN_GRID = "0.0"
+DARKEN_COLOUR = "0.3"

handheld/simpletex_lcd+gbc-color.slangp

@@ -0,0 +1,21 @@
+shaders = "1"
+
+shader0 = "shaders/simpletex_lcd/simpletex_lcd+gbc-color.slang"
+
+filter_linear0 = "true"
+wrap_mode0 = "clamp_to_border"
+mipmap_input0 = "false"
+alias0 = ""
+float_framebuffer0 = "false"
+srgb_framebuffer0 = "false"
+
+textures = "BACKGROUND"
+BACKGROUND = "shaders/simpletex_lcd/png/2k/textured_paper.png"
+BACKGROUND_linear = false
+
+parameters = "GRID_INTENSITY;GRID_WIDTH;GRID_BIAS;DARKEN_GRID;DARKEN_COLOUR"
+GRID_INTENSITY = "1.0"
+GRID_WIDTH = "0.9"
+GRID_BIAS = "0.65"
+DARKEN_GRID = "0.0"
+DARKEN_COLOUR = "0.3"

handheld/simpletex_lcd-4k.slangp

@@ -0,0 +1,21 @@
+shaders = "1"
+
+shader0 = "shaders/simpletex_lcd/simpletex_lcd-4k.slang"
+
+filter_linear0 = "true"
+wrap_mode0 = "clamp_to_border"
+mipmap_input0 = "false"
+alias0 = ""
+float_framebuffer0 = "false"
+srgb_framebuffer0 = "false"
+
+textures = "BACKGROUND"
+BACKGROUND = "shaders/simpletex_lcd/png/4k/textured_paper.png"
+BACKGROUND_linear = false
+
+parameters = "GRID_INTENSITY;GRID_WIDTH;GRID_BIAS;DARKEN_GRID;DARKEN_COLOUR"
+GRID_INTENSITY = "1.0"
+GRID_WIDTH = "0.8"
+GRID_BIAS = "0.6"
+DARKEN_GRID = "0.0"
+DARKEN_COLOUR = "0.5"

handheld/simpletex_lcd.slangp

@@ -0,0 +1,21 @@
+shaders = "1"
+
+shader0 = "shaders/simpletex_lcd/simpletex_lcd.slang"
+
+filter_linear0 = "true"
+wrap_mode0 = "clamp_to_border"
+mipmap_input0 = "false"
+alias0 = ""
+float_framebuffer0 = "false"
+srgb_framebuffer0 = "false"
+
+textures = "BACKGROUND"
+BACKGROUND = "shaders/simpletex_lcd/png/2k/textured_paper.png"
+BACKGROUND_linear = false
+
+parameters = "GRID_INTENSITY;GRID_WIDTH;GRID_BIAS;DARKEN_GRID;DARKEN_COLOUR"
+GRID_INTENSITY = "1.0"
+GRID_WIDTH = "0.8"
+GRID_BIAS = "0.6"
+DARKEN_GRID = "0.0"
+DARKEN_COLOUR = "0.5"