Upgrade shaders from GLSL 110 to 150 (OpenGL 3.2)

app/shaders/rgbwaveform.frag

@@ -1,29 +1,32 @@
 // Adapted from "RGB Waveform" by lebek
 // https://www.shadertoy.com/view/4dK3Wc
 
-#version 110
+#version 150
 
 uniform sampler2D ove_maintex;
 uniform vec2 ove_resolution;
-varying vec2 ove_texcoord;
 
 uniform float threshold;
 
+in vec2 ove_texcoord;
+
+out vec4 fragColor;
+
 void main(void) {
     vec3 col = vec3(0.0);
-    float s = ove_texcoord.y*1.8 - 0.15;
-    float maxb = s+threshold;
-    float minb = s-threshold;
-    
+    float s = ove_texcoord.y * 1.8 - 0.15;
+    float maxb = s + threshold;
+    float minb = s - threshold;
+
     int y_lim = int(ove_resolution.y);
 
     for (int i = 0; i < y_lim; i++) {
-        vec3 x = texture2D(ove_maintex, vec2(ove_texcoord.x, float(i)/float(ove_resolution.y))).rgb;
-        col += step(x, vec3(maxb))*step(vec3(minb), x) / (ove_resolution.y * 0.125);
+        vec3 x = texture(ove_maintex, vec2(ove_texcoord.x, float(i) / float(ove_resolution.y))).rgb;
+        col += step(x, vec3(maxb)) * step(vec3(minb), x) / (ove_resolution.y * 0.125);
 
         float l = dot(x, x);
-        col += step(l, maxb*maxb)*step(minb*minb, l) / (ove_resolution.y * 0.125);
+        col += step(l, maxb * maxb) * step(minb * minb, l) / (ove_resolution.y * 0.125);
     }
 
-    gl_FragColor = vec4(col, 1.0);
+    fragColor = vec4(col, 1.0);
 }