add gba-color shader

res/shaders/gba-color.shader/gba-color.fs

@@ -0,0 +1,42 @@
+varying vec2 texCoord;
+uniform sampler2D tex;
+uniform vec2 texSize;
+
+uniform float darken_screen;
+uniform float target_gamma;
+uniform float display_gamma;
+uniform float sat;
+uniform float lum;
+uniform float contrast;
+uniform float blr;
+uniform float blg;
+uniform float blb;
+uniform float r;
+uniform float g;
+uniform float b;
+uniform float rg;
+uniform float rb;
+uniform float gr;
+uniform float gb;
+uniform float br;
+uniform float bg;
+
+void main() {
+   vec4 screen = pow(texture2D(tex, texCoord), vec4(target_gamma + darken_screen)).rgba;
+   vec4 avglum = vec4(0.5);
+   screen = mix(screen, avglum, (1.0 - contrast));
+ 
+mat4 color = mat4(r,  rg,  rb, 0.0,
+			     gr,   g,  gb, 0.0,
+			     br,  bg,   b, 0.0,
+			    blr, blg, blb, 1.0);
+			  
+mat4 adjust = mat4((1.0 - sat) * 0.3086 + sat, (1.0 - sat) * 0.3086, (1.0 - sat) * 0.3086, 1.0,
+(1.0 - sat) * 0.6094, (1.0 - sat) * 0.6094 + sat, (1.0 - sat) * 0.6094, 1.0,
+(1.0 - sat) * 0.0820, (1.0 - sat) * 0.0820, (1.0 - sat) * 0.0820 + sat, 1.0,
+0.0, 0.0, 0.0, 1.0);
+	color *= adjust;
+	screen = clamp(screen * lum, 0.0, 1.0);
+	screen = color * screen;
+	gl_FragColor = pow(screen, vec4(1.0 / display_gamma + (darken_screen / 8.)));
+}

res/shaders/gba-color.shader/manifest.ini

@@ -0,0 +1,99 @@
+[shader]
+name=GBA Color
+author=Pokefan531 and hunterk
+description=Modifies the color output to simulate the GBA LCD characteristics.
+passes=1
+
+[pass.0]
+fragmentShader=gba-color.fs
+blend=1
+
+[pass.0.uniform.darken_screen]
+type=float
+default=0.5
+readableName=Darken Screen
+
+[pass.0.uniform.target_gamma]
+type=float
+default=2.2
+readableName=Target Gamma
+
+[pass.0.uniform.display_gamma]
+type=float
+default=2.5
+readableName=Display Gamma
+
+[pass.0.uniform.sat]
+type=float
+default=1.0
+readableName=Saturation
+
+[pass.0.uniform.lum]
+type=float
+default=0.99
+readableName=Luminance
+
+[pass.0.uniform.contrast]
+type=float
+default=1.0
+readableName=Constrast
+
+[pass.0.uniform.blr]
+type=float
+default=0.0
+readableName=Black's Red Tint
+
+[pass.0.uniform.blg]
+type=float
+default=0.0
+readableName=Black's Green Tint
+
+[pass.0.uniform.blb]
+type=float
+default=0.0
+readableName=Black's Blue Tint
+
+[pass.0.uniform.r]
+type=float
+default=0.84
+readableName=Red's Intensity
+
+[pass.0.uniform.g]
+type=float
+default=0.67
+readableName=Green's Intensity
+
+[pass.0.uniform.b]
+type=float
+default=0.73
+readableName=Blue's Intensity
+
+[pass.0.uniform.rg]
+type=float
+default=0.09
+readableName=Red's Green Tint
+
+[pass.0.uniform.rb]
+type=float
+default=0.15
+readableName=Red's Blue Tint
+
+[pass.0.uniform.gr]
+type=float
+default=0.18
+readableName=Green's Red Tint
+
+[pass.0.uniform.gb]
+type=float
+default=0.10
+readableName=Green's Blue Tint
+
+[pass.0.uniform.br]
+type=float
+default=0.0
+readableName=Blue's Red Tint
+
+[pass.0.uniform.bg]
+type=float
+default=0.26
+readableName=Blue's Green Tint