ported the University CGI demo from WINDOWS + GLUT + GLEW + GLU + OpenGL 4 to LINUX WAYLAND + EGL + GLES 2 with minimal cuts

GL_STUFF/SOURCES/EFFECTS/SCREEN/fragmentShader_2.glsl

@@ -0,0 +1,18 @@
+#version 300 es
+
+/*this will affect all the float guys (float, vecN, matN )*/
+precision mediump float;
+
+in vec3 fragPos;
+in vec2 frag_uv;  //coordinate 2d di texure
+
+uniform sampler2D inTex;   //campionatore 2d 
+
+out vec4 FragColor;  
+
+
+void main()
+{   
+    //FragColor = vec4(1.0f, 1.0f, 0, 1);
+    FragColor = texture(inTex, frag_uv);
+}