okay maybe not

app/shaders/default.frag

@@ -0,0 +1,21 @@
+#version 150
+
+#ifdef GL_ES
+precision highp int;
+precision highp float;
+#endif
+
+// Input texture
+uniform sampler2D ove_maintex;
+
+// Input texture coordinate
+in vec2 ove_texcoord;
+
+// Output color
+out vec4 fragColor;
+
+void main() {
+    vec2 using_texcoord = ove_texcoord;
+    vec4 color = texture(ove_maintex, ove_texcoord);
+    fragColor = color;
+}

app/shaders/default.vert

@@ -0,0 +1,18 @@
+#version 150
+
+#ifdef GL_ES
+precision highp int;
+precision highp float;
+#endif
+
+uniform mat4 ove_mvpmat;
+
+in vec4 a_position;
+in vec2 a_texcoord;
+
+out vec2 ove_texcoord;
+
+void main() {
+    gl_Position = ove_mvpmat * a_position;
+    ove_texcoord = a_texcoord;
+}

app/shaders/deinterlace.frag

@@ -0,0 +1,26 @@
+#version 150
+
+#ifdef GL_ES
+precision highp int;
+precision highp float;
+#endif
+
+uniform sampler2D ove_maintex;
+uniform vec2 ove_resolution;
+
+in vec2 ove_texcoord;
+
+out vec4 fragColor;
+
+void main() {
+    vec2 using_texcoord = ove_texcoord;
+
+    // A very basic deinterlace that halves the vertical
+    // resolution and linearly interpolates the two fields
+    // by reading the texture coord between them.
+    float half_vert = round(ove_resolution.y / 2.0);
+    using_texcoord.y = (round(using_texcoord.y * half_vert) + 0.25) / half_vert;
+
+    vec4 color = %1(texture(ove_maintex, using_texcoord));
+    fragColor = color;
+}