From 270476e0387201c85aa686254eb2f4a33205b7d1 Mon Sep 17 00:00:00 2001
From: Ilion Beyst <ilion.beyst@gmail.com>
Date: Mon, 18 Jul 2022 07:40:01 +0200
Subject: use texture for rendering planets

---
 web/pw-visualizer/assets/shaders/frag/image.glsl    |  1 -
 .../assets/shaders/frag/masked_image.glsl           | 21 +++++++++++++++++++++
 2 files changed, 21 insertions(+), 1 deletion(-)
 create mode 100644 web/pw-visualizer/assets/shaders/frag/masked_image.glsl

(limited to 'web/pw-visualizer/assets/shaders')

diff --git a/web/pw-visualizer/assets/shaders/frag/image.glsl b/web/pw-visualizer/assets/shaders/frag/image.glsl
index 69c8b91..f8d62c9 100644
--- a/web/pw-visualizer/assets/shaders/frag/image.glsl
+++ b/web/pw-visualizer/assets/shaders/frag/image.glsl
@@ -10,5 +10,4 @@ uniform sampler2D u_texture;
 
 void main() {
    gl_FragColor = texture2D(u_texture, v_texCoord);
-//    gl_FragColor = vec4(0.7, 0.7, 0.0, 1.0);
 }
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);
+}
-- 
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