Add GBC color shader and presets

handheld/gbc-color.slangp

@@ -0,0 +1,6 @@
+shaders = 1
+
+shader0 = shaders/color/gbc-color.slang
+filter_linear0 = false
+scale_type_0 = source
+scale0 = 1.0

handheld/lcd-grid-v2-gbc-color-motionblur.slangp

@@ -0,0 +1,32 @@
+shaders = "3"
+
+shader0 = "../motionblur/shaders/motionblur-simple.slang"
+filter_linear0 = "false"
+scale_type0 = "source"
+scale0 = "1.0"
+
+shader1 = "shaders/lcd-cgwg/lcd-grid-v2.slang"
+filter_linear1 = "false"
+scale_type1 = "viewport"
+scale1 = "1.0"
+
+shader2 = "shaders/color/gbc-color.slang"
+filter_linear2 = "false"
+scale_type2 = "source"
+scale2 = "1.0"
+
+parameters = "RSUBPIX_R;RSUBPIX_G;RSUBPIX_B;GSUBPIX_R;GSUBPIX_G;GSUBPIX_B;BSUBPIX_R;BSUBPIX_G;BSUBPIX_B;gain;gamma;blacklevel;ambient;BGR"
+RSUBPIX_R = "0.750000"
+RSUBPIX_G = "0.000000"
+RSUBPIX_B = "0.000000"
+GSUBPIX_R = "0.000000"
+GSUBPIX_G = "0.750000"
+GSUBPIX_B = "0.000000"
+BSUBPIX_R = "0.000000"
+BSUBPIX_G = "0.000000"
+BSUBPIX_B = "0.750000"
+gain = "1.500000"
+gamma = "2.200000"
+blacklevel = "0.000000"
+ambient = "0.000000"
+BGR = "1.000000"

handheld/lcd-grid-v2-gbc-color.slangp

@@ -0,0 +1,27 @@
+shaders = "2"
+
+shader0 = "shaders/lcd-cgwg/lcd-grid-v2.slang"
+filter_linear0 = "false"
+scale_type0 = "viewport"
+scale0 = "1.0"
+
+shader1 = "shaders/color/gbc-color.slang"
+filter_linear1 = "false"
+scale_type1 = "source"
+scale1 = "1.0"
+
+parameters = "RSUBPIX_R;RSUBPIX_G;RSUBPIX_B;GSUBPIX_R;GSUBPIX_G;GSUBPIX_B;BSUBPIX_R;BSUBPIX_G;BSUBPIX_B;gain;gamma;blacklevel;ambient;BGR"
+RSUBPIX_R = "0.750000"
+RSUBPIX_G = "0.000000"
+RSUBPIX_B = "0.000000"
+GSUBPIX_R = "0.000000"
+GSUBPIX_G = "0.750000"
+GSUBPIX_B = "0.000000"
+BSUBPIX_R = "0.000000"
+BSUBPIX_G = "0.000000"
+BSUBPIX_B = "0.750000"
+gain = "1.500000"
+gamma = "2.200000"
+blacklevel = "0.000000"
+ambient = "0.000000"
+BGR = "1.000000"

handheld/shaders/color/gbc-color.slang

@@ -0,0 +1,62 @@
+#version 450
+
+/*
+   GBC Color Correction Shader
+   A shader that replicates the LCD dynamics from a Game Boy Color
+   Color values are derived from Gambatte's color correction implementation.
+
+   Based on Color Mangler
+   Author: hunterk
+   License: Public domain
+*/
+
+layout(std140, set = 0, binding = 0) uniform UBO
+{
+   mat4 MVP;
+   vec4 OutputSize;
+   vec4 OriginalSize;
+   vec4 SourceSize;
+} global;
+
+#define blr 0.0
+#define blg 0.0
+#define blb 0.0
+#define r 0.78824
+#define g 0.72941
+#define b 0.66667
+#define rg 0.00
+#define rb 0.18039
+#define gr 0.12157
+#define gb 0.12157
+#define br 0.05882
+#define bg 0.24314
+
+#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 screen = texture(Source, vTexCoord);
+   
+   //                r   g    b   black
+   mat4 color = mat4(r,  rg,  rb, 0.0,       //red channel
+                     gr,  g,   gb, 0.0,      //green channel
+                     br,  bg,  b,  0.0,      //blue channel
+                     blr, blg, blb,    0.0); //alpha channel; these numbers do nothing for our purposes.
+                 
+   screen = color * screen;
+   FragColor = screen;
+}

presets/retro-v2+gbc-color.slangp

@@ -0,0 +1,14 @@
+shaders = "2"
+
+shader0 = "../handheld/shaders/color/gbc-color.slang"
+shader1 = "../retro/shaders/retro-v2.slang"
+
+filter_linear0 = "false"
+scale_type0 = "source"
+scale0 = "1.000000"
+
+filter_linear1 = "false"
+
+parameters = "darken_screen;RETRO_PIXEL_SIZE"
+darken_screen = "0.500000"
+RETRO_PIXEL_SIZE = "0.840000"