const char fragShader[] =
"uniform sampler2D Texture0;\n"
"uniform sampler2D Texture1;\n"
"uniform sampler2D Texture2;\n"
"varying vec2 texCoord;\n"

"void main(void)\n"
"{\n"
"vec4 tex = texture2D( Texture0, texCoord );\n"
"vec4 alpha = texture2D( Texture1, texCoord );\n"
"alpha.r= alpha.r + alpha.g +alpha.b;\n"
"gl_FragColor = mix(tex,texture2D( Texture2, texCoord ),alpha.r/3);\n"
"} \n";