[require]
GLSL >= 1.30
GL_ARB_shader_bit_encoding

[vertex shader]
#version 130
#extension GL_ARB_shader_bit_encoding : enable

in vec4 piglit_vertex;
out vec4 color;

vec4 temps[12];
int addr0;

void main()
{
	temps[0]  = vec4(0.2, 0  , 0  , 0);
	temps[1]  = vec4(0  , 0.2, 0  , 0);
	temps[2]  = vec4(0  , 0  , 0.2, 0);
	temps[3]  = vec4(0.2, 0.2, 0  , 0);
	temps[4]  = vec4(0  , 0.2, 0.2, 0);
	temps[5]  = vec4(0.2, 0  , 0.2, 0);
	temps[6]  = vec4(0  , 0  , 0  , 0);
	temps[7]  = vec4(0.2, 0.2, 0.2, 0);
	temps[9]  = vec4(0  , 0  , 0  , 0);
	temps[10] = vec4(0  , 0  , 0  , 0);

        int n = 0;
	while (n < 4) {
		addr0 = int(floatBitsToInt(temps[10].xxxx));
		temps[9] += temps[addr0];
		temps[10].x = intBitsToFloat(n + 1);
		n = floatBitsToInt(temps[10].x);
	};

	gl_Position = piglit_vertex;
	color = clamp(temps[9], 0.0, 1.0);
}

[fragment shader]
#version 130
in vec4 color;
void main()
{
	gl_FragColor = color;
}

[test]
clear color 0.0 0.0 0.0 0.0
clear
ortho
draw rect -1 -1 2 2
probe rgba  2 2  .40 .40 .20 0.0