[require]
GLSL >= 1.10

[vertex shader]
varying vec4 texcoords;

void main()
{
	gl_Position = gl_Vertex;
	texcoords = (gl_Vertex + 1.0) / 2.0;
}

[fragment shader]
varying vec4 texcoords;
uniform sampler2D tex;

#define FILTER_SIZE 34
uniform vec2 o[FILTER_SIZE];
uniform float c[FILTER_SIZE];

/* Testcase from Owen Taylor of a shader being experimented with in
 * gnome-shell that failed on i965 due to register allocation.
*
* Unlike glsl-fs-convolution-1, this one prevented loop unrolling by
* using more iterations.
 */
void main()
{
	vec4 value = vec4(0.0);
	for (int i = 0; i < FILTER_SIZE; i++) {
		value += c[i] * texture2D(tex, texcoords.xy + o[i]);
	}

	gl_FragColor = value;
}

[test]
uniform int tex 0

uniform float c[0] 0.0
uniform float c[1] 0.0
uniform float c[2] 0.0
uniform float c[3] 0.0
uniform float c[4] 0.0
uniform float c[5] 0.0
uniform float c[6] 0.0
uniform float c[7] 0.0
uniform float c[8] 0.0
uniform float c[9] 0.0
uniform float c[10] 0.0
uniform float c[11] 0.0
uniform float c[12] 0.0
uniform float c[13] 0.0
uniform float c[14] 0.0
uniform float c[15] 0.0
uniform float c[16] 0.0
uniform float c[17] 0.0
uniform float c[18] 0.0
uniform float c[19] 0.0
uniform float c[20] 1.0
uniform float c[21] 0.0
uniform float c[22] 0.0
uniform float c[23] 0.0
uniform float c[24] 0.0
uniform float c[25] 0.0
uniform float c[26] 0.0
uniform float c[27] 0.0
uniform float c[28] 0.0
uniform float c[29] 0.0
uniform float c[30] 0.0
uniform float c[31] 0.0
uniform float c[32] 0.0
uniform float c[33] 0.0

uniform vec2 o[0] -1.0 1.0
uniform vec2 o[1] -1.0 1.0
uniform vec2 o[2] -1.0 1.0
uniform vec2 o[3] -1.0 1.0
uniform vec2 o[4] -1.0 1.0
uniform vec2 o[5] -1.0 1.0
uniform vec2 o[6] -1.0 1.0
uniform vec2 o[7] -1.0 1.0
uniform vec2 o[8] -1.0 1.0
uniform vec2 o[9] -1.0 1.0
uniform vec2 o[10] -1.0 1.0
uniform vec2 o[11] -1.0 1.0
uniform vec2 o[12] -1.0 1.0
uniform vec2 o[13] -1.0 1.0
uniform vec2 o[14] -1.0 1.0
uniform vec2 o[15] -1.0 1.0
uniform vec2 o[16] -1.0 1.0
uniform vec2 o[17] -1.0 1.0
uniform vec2 o[18] -1.0 1.0
uniform vec2 o[19] -1.0 1.0
uniform vec2 o[20] 0.0 0.0
uniform vec2 o[21] -1.0 1.0
uniform vec2 o[22] -1.0 1.0
uniform vec2 o[23] -1.0 1.0
uniform vec2 o[24] -1.0 1.0
uniform vec2 o[25] -1.0 1.0
uniform vec2 o[26] -1.0 1.0
uniform vec2 o[27] -1.0 1.0
uniform vec2 o[28] -1.0 1.0
uniform vec2 o[29] -1.0 1.0
uniform vec2 o[30] -1.0 1.0
uniform vec2 o[31] -1.0 1.0
uniform vec2 o[32] -1.0 1.0
uniform vec2 o[33] -1.0 1.0

texture rgbw 0 (8, 8)
draw rect -1 -1 2 2
relative probe rgb (0.25, 0.25) (1.0, 0.0, 0.0)
relative probe rgb (0.75, 0.25) (0.0, 1.0, 0.0)
relative probe rgb (0.25, 0.75) (0.0, 0.0, 1.0)
relative probe rgb (0.75, 0.75) (1.0, 1.0, 1.0)