Reorganize assets

assets/assets_linux/shaders/opengl/ConvertY.frag

@@ -0,0 +1,26 @@
+#version 300 es
+
+#ifdef GL_ES
+precision lowp float;
+#endif
+
+uniform sampler2D image;
+
+layout(shared) uniform ColorMatrix {
+  vec4 color_vec_y;
+  vec4 color_vec_u;
+  vec4 color_vec_v;
+  vec2 range_y;
+  vec2 range_uv;
+};
+
+in vec2 tex;
+layout(location = 0) out float color;
+
+void main()
+{
+	vec3 rgb = texture(image, tex).rgb;
+	float y = dot(color_vec_y.xyz, rgb);
+
+	color = y * range_y.x + range_y.y;
+}