1 files changed, 21 insertions, 0 deletions
diff --git a/web/pw-visualizer/assets/shaders/frag/masked_image.glsl b/web/pw-visualizer/assets/shaders/frag/masked_image.glsl
new file mode 100644
index 0000000..da0c787
--- /dev/null
+++ b/web/pw-visualizer/assets/shaders/frag/masked_image.glsl
@@ -0,0 +1,21 @@
+#ifdef GL_ES
+precision mediump float;
+#endif
+
+// Passed in from the vertex shader.
+varying vec2 v_texCoord;
+
+uniform float u_step_interval;
+uniform float u_time;
+uniform vec3 u_color;
+uniform vec3 u_color_next;
+
+
+// The texture.
+uniform sampler2D u_texture;
+
+void main() {
+   float alpha = texture2D(u_texture, v_texCoord).a;
+   vec3 color = mix(u_color, u_color_next, u_time);
+   gl_FragColor = vec4(color, alpha);
+}