attribute vec2 aVertexPosition;
attribute vec2 aTextureCoord;

uniform mat3 projectionMatrix;
uniform mat3 otherMatrix;

varying vec2 vMapCoord;
varying vec2 vTextureCoord;

void main(void)
{
   gl_Position = vec4((projectionMatrix * vec3(aVertexPosition, 1.0)).xy, 0.0, 1.0);
   vTextureCoord = aTextureCoord;
   vMapCoord = ( otherMatrix * vec3( aTextureCoord, 1.0)  ).xy;
}