[require]
GLSL >= 1.10

[vertex shader]
varying vec2 texcoords;
uniform float yoffset;

void main()
{
	gl_Position = gl_Vertex;
	texcoords = gl_Vertex.xy + vec2(0.0, yoffset);
}

[fragment shader]
varying vec2 texcoords;
uniform sampler2D tex[2];

void main()
{
	if (texcoords.x < 0.0) {
		gl_FragColor = texture2D(tex[0], texcoords.xy + vec2(1.0, 0.0));
	} else {
		gl_FragColor = texture2D(tex[1], texcoords.xy);
	}
}

[test]
texture checkerboard 0 0 (8, 8) (0.0, 0.0, 0.0, 0.0) (0.0, 1.0, 0.0, 0.0)
texture checkerboard 1 0 (8, 8) (0.0, 0.0, 0.0, 0.0) (1.0, 0.0, 0.0, 0.0)

uniform int tex[0] 0
uniform int tex[1] 1
uniform float yoffset 1.0
draw rect -1 -1 2 1

uniform int tex[0] 1
uniform int tex[1] 0
uniform float yoffset 0.0
draw rect -1 0 2 1

relative probe rgb (0.375, 0.125) (0.0, 1.0, 0.0)
relative probe rgb (0.125, 0.375) (0.0, 1.0, 0.0)
relative probe rgb (0.875, 0.625) (0.0, 1.0, 0.0)
relative probe rgb (0.675, 0.875) (0.0, 1.0, 0.0)

relative probe rgb (0.875, 0.125) (1.0, 0.0, 0.0)
relative probe rgb (0.625, 0.375) (1.0, 0.0, 0.0)
relative probe rgb (0.375, 0.625) (1.0, 0.0, 0.0)
relative probe rgb (0.125, 0.875) (1.0, 0.0, 0.0)