First commit of the starter kit.

assets/config.json

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+{
+  "sounds": {
+    "ui_click": "assets/sounds/ui_click.ogg",
+    "ui_hover": "assets/sounds/ui_hover.ogg",
+    "clicker_bark": "assets/sounds/clicker_bark.ogg",
+    "blank": "assets/sounds/blank.ogg"
+  },
+  "sprites": {
+    "textures_test":
+    {"path": "assets/textures_test.png",
+      "frame_width": 53,
+      "frame_height": 34
+    },
+    "clicker_the_dog":
+    {"path": "assets/clicker_the_dog-1024.png",
+      "frame_width": 1024,
+      "frame_height": 1024
+    },
+    "clicker_treat_bone":
+    {"path": "assets/clicker_treat_bone.png",
+      "frame_width": 256,
+      "frame_height": 144
+    }
+  },
+  "graphics": {
+    "smooth_textures": false
+  }
+}

assets/shaders.json

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+{
+  "ui_shader": {
+    "file_name": "assets/shaders/ui_shader.frag",
+    "type": "fragment"
+  },
+  "ERROR": {
+    "file_name": "assets/shaders/ui_error.frag",
+    "type": "fragment"
+  }
+}

assets/shaders/ui_error.frag

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+uniform vec2 u_resolution;
+uniform vec2 u_mouse;
+uniform float u_duration;
+uniform float u_time;
+uniform float u_time_end;
+uniform sampler2D texture;
+uniform bool is_shape;
+
+void main() {
+  if(is_shape) {
+    vec4 color = vec4(1.0, 0.0, 0.0, 1.0);
+    gl_FragColor = gl_Color * color;
+  } else {
+    vec4 pixel = texture2D(texture, gl_TexCoord[0].xy);
+    vec4 color = vec4(1.0, 0.0, 0.0, 1.0);
+    gl_FragColor = gl_Color * color * pixel;
+  }
+}

assets/shaders/ui_shader.frag

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+uniform vec2 u_resolution;
+uniform vec2 u_mouse;
+uniform float u_duration;
+uniform float u_time;
+uniform float u_time_end;
+uniform sampler2D texture;
+uniform bool is_shape;
+uniform bool hover;
+
+vec4 blink() {
+  if(hover) {
+    return vec4(0.95, 0.95, 1.0, 1.0);
+  } else {
+    float tick = (u_time_end - u_time) / u_duration;
+    float blink = mix(0.5, 1.0, tick);
+    return vec4(blink, blink, blink, 1.0);
+  }
+}
+
+void main() {
+  vec4 color = blink();
+
+  if(!is_shape) {
+    vec4 pixel = texture2D(texture, gl_TexCoord[0].xy);
+    color *= pixel;
+  }
+
+  gl_FragColor = gl_Color * color;
+}

assets/shaders/ui_shape_shader.frag

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+uniform vec2 u_resolution;
+uniform vec2 u_mouse;
+uniform float u_duration;
+uniform float u_time;
+uniform float u_time_end;
+
+void main() {
+  float tick = (u_time_end - u_time) / u_duration;
+  float blink = smoothstep(1.0, 0.5, tick);
+  vec4 color = vec4(blink, blink, blink, 1.0);
+  gl_FragColor = gl_Color * color;
+}