optimize graphics performance

modules/game_shaders/item.frag

@@ -1,11 +1,11 @@
 uniform float opacity; // painter opacity
 uniform vec4 color; // painter color
 uniform float time; // time in seconds since shader linkage
-uniform sampler2D texture; // map texture
+uniform sampler2D tex0; // map texture
+varying vec2 texCoord; // map texture coords
 //uniform int itemId; // item id
-varying vec2 textureCoords; // map texture coords
 
 void main()
 {
-    gl_FragColor = texture2D(texture, textureCoords);
+    gl_FragColor = texture2D(tex0, texCoord);
 }

modules/game_shaders/map.frag

@@ -1,13 +1,13 @@
 uniform float opacity; // painter opacity
 uniform vec4 color; // painter color
 uniform float time; // time in seconds since shader linkage
-uniform sampler2D texture; // map texture
-varying vec2 textureCoords; // map texture coords
+uniform sampler2D tex0; // map texture
+varying vec2 texCoord; // map texture coords
 //uniform vec4 awareArea;
 
 void main()
 {
-    gl_FragColor = texture2D(texture, textureCoords);
+    gl_FragColor = texture2D(tex0, texCoord);
 }
 
 /*

modules/game_shaders/outfit.frag

@@ -2,9 +2,9 @@ uniform float opacity; // painter opacity
 uniform vec4 color; // painter color
 uniform float time; // time in seconds since shader linkage
 
-uniform sampler2D texture; // outfit texture
-varying vec2 textureCoords; // outfit texture coords
-uniform sampler2D maskTexture; // outfit color mask
+uniform sampler2D tex0; // outfit texture
+uniform sampler2D tex1; // outfit color mask
+varying vec2 texCoord; // outfit texture coords
 
 uniform vec4 headColor;
 uniform vec4 bodyColor;
@@ -14,8 +14,8 @@ uniform vec4 feetColor;
 
 vec4 calcOutfitPixel()
 {
-    vec4 pixel = texture2D(texture, textureCoords);
-    vec4 maskColor = texture2D(maskTexture, textureCoords);
+    vec4 pixel = texture2D(tex0, texCoord);
+    vec4 maskColor = texture2D(tex1, texCoord);
 
     vec4 outColor = vec4(1.0, 1.0, 1.0, 1.0);
     if(maskColor.r > 0.1 && maskColor.g > 0.1)