Experimenting with GLSL

wave.fs

uniform sampler2D tex;

void main(){
	gl_FragColor = texture2D(tex, gl_TexCoord[0].xy);
}

wave.vs

uniform float time;

void main(){
	vec4 vertex = gl_Vertex;

	vertex.z = sin(vertex.y * 0.2 * time * 5.0) * 0.25;

	gl_TexCoord[0] = gl_MultiTexCoord0;
	gl_Position = gl_ModelViewProjectionMatrix * vertex;
}