[require]
GLSL >= 1.10

[vertex shader]
/* Tests for a bug in the 965 vertex shader backend where kills of
 * overwritten copy propagation sources didn't happen when new
 * propagation entries were being created.
 */

uniform vec4 u;
uniform int j;
varying vec4 color;

void main()
{
	float a;
	float b = u.y;

	color = u;

	/* This loop tricks core GLSL into not optimizing out the
	 * pattern for hitting the driver bug.
	 */
	for (int i = 0; i < j; i++) {
		a = b; /* a = 1.0 */
		b = color.z; /* b = 0 */
		color.z = a; /* color.z = 0.5, but the bug makes it 0. */
	}
	gl_Position = gl_Vertex;
}

[fragment shader]
varying vec4 color;

void main()
{
	gl_FragColor = color;
}

[test]
uniform vec4 u 0 1 0 0
uniform int j 1
draw rect -1 -1 2 2
probe all rgba 0 1 1 0