yes

modules/wallpaper-engine/shaders/genericimage.frag

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+
+#include "common_fragment.h"
+
+uniform sampler2D g_Texture0;
+
+uniform float g_Brightness; // {"material":"Bright","default":1,"range":[0,2]}
+uniform float g_UserAlpha; // {"material":"Alpha","default":1,"range":[0,1]}
+uniform float g_Power; // {"material":"Power","default":1,"range":[0,6]}
+
+varying vec2 v_TexCoord;
+
+#if MULTI
+uniform sampler2D g_Texture1;
+
+varying vec2 v_TexCoord2;
+#endif
+
+void main() {
+	vec4 albedo = texSample2D(g_Texture0, v_TexCoord.xy);
+	
+#if MULTI
+	albedo *= texSample2D(g_Texture1, v_TexCoord2.xy);
+#endif
+	
+	albedo.rgb *= g_Brightness;
+	albedo.a *= g_UserAlpha;
+	albedo.rgb = pow(albedo.rgb, CAST3(g_Power));
+	
+	gl_FragColor = albedo;
+}