I have just spent my first half hour playing with the shader language.

I have modified the basic program I have which renders the texture, to allow me to colour the texture.

varying vec2 texCoord;
uniform sampler2D texSampler;

/* Given the texture coordinates, our pixel shader grabs the corresponding
 * color from the texture.
 */
void main() {
  //gl_FragColor = texture2D(texSampler, texCoord);
    gl_FragColor = vec4(0,1,0,1)*vec4(texture2D(texSampler,texCoord).xyz,1);
}

I have noticed how this affects my transparent textures, and I believe I am loosing the alpha channel which would explain why previously transparent area's appear totally black.

If I use the following line instead, I am shown the transparent area's

gl_FragColor = vec4(0,1,0,1)*vec4(texture2D(texSampler,texCoord).aaa,1);

How can I retain the transparency after this modification to the colour?

I have seen various things about a .w property, and also luminous, but my tweaks with those and the .aaa property are not working XD