refactor(glsl): rename uniforms as iXxx

shaders/frag3.glsl

@@ -5,8 +5,8 @@
 in vec2 vUV;
 out vec4 fragColor;
 
-uniform vec3 src1_1[6];
+uniform vec3 iMidi1_1[6];
 
 void main() {
-    fragColor = src_stage(vUV, seed3, src1_1[0], src1_1[1].xy, src1_1[2], src1_1[3].xy, src1_1[4], src1_1[5].xy);
+    fragColor = src_stage(vUV, iSeed3, iMidi1_1[0], iMidi1_1[1].xy, iMidi1_1[2], iMidi1_1[3].xy, iMidi1_1[4], iMidi1_1[5].xy);
 }