refactor(glsl): rename uniforms as iXxx

shaders/frag8.glsl

@@ -8,11 +8,11 @@ in vec2 vUV;
 out vec4 fragColor;
 
 void main() {
-    vec4 color = fx_stage(vUV, tex9, tex0, seed8, src2_3[0], src2_3[1].xy, src2_3[2], src2_3[3].xy, src2_3[4], src2_3[5].xy, src2_3[6].xy);
+    vec4 color = fx_stage(vUV, iTex9, iTex0, iSeed8, iMidi2_3[0], iMidi2_3[1].xy, iMidi2_3[2], iMidi2_3[3].xy, iMidi2_3[4], iMidi2_3[5].xy, iMidi2_3[6].xy);
 
-    color = mix(color, vec4(0), src3_1[0].y);
+    color = mix(color, vec4(0), iMidi3_1[0].y);
 
-    color = mix(color, 1 - color, src3_1[0].z);
+    color = mix(color, 1 - color, iMidi3_1[0].z);
 
     fragColor = color;
 }