uniform mat4 u_mvpMatrix;

uniform vec3 texSize; // xy = texSize1,  xz = texSize2

attribute vec4 a_position;

attribute vec3 a_texCoord;

varying vec4 intCoord;

varying vec4 cornerCoord0;

varying vec4 cornerCoord1;

void main()

{

	gl_Position = u_mvpMatrix * a_position;

	intCoord.xy = a_texCoord.xy * texSize.xy;

	intCoord.zw = -intCoord.xy;

	cornerCoord0 = vec4(a_texCoord.xy,

	                    a_texCoord.xy + 1.0 / texSize.xy);

	cornerCoord1 = vec4(a_texCoord.xz,

	                    a_texCoord.xz + 1.0 / texSize.xz);

}