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uniform vec2 Vtl,Vbl,Vtr,Vbr; // Vertex position
uniform vec2 Ttl,Tbl,Ttr,Tbr; // texture coordinate
uniform vec2 center;
varying vec2 pos;
void main()
{
gl_TexCoord[0] = gl_MultiTexCoord0;
vec4 position = gl_Vertex;
position.xy += 1.;
position.xy /= 2.;
pos = position.xy;
position.xy = pow(position.xy,center);
vec2 tex_top = mix(Ttl,Ttr,pos.x);
vec2 tex_bottom = mix(Tbl,Tbr,pos.x);
gl_TexCoord[0].st = mix(tex_top,tex_bottom, pos.y);
vec2 pos_top = mix(Vtl,Vtr,position.x);
vec2 pos_bottom = mix(Vbl,Vbr,position.x);
position.xy = mix(pos_top,pos_bottom, position.y);
gl_Position = gl_ModelViewProjectionMatrix * position;
}
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