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# From the GLSL 1.30 spec, section 7.1 (Vertex Shader Special
# Variables):
#
# Values written into gl_ClipDistance for planes that are not
# enabled have no effect.
#
# This test sets up 6 clipping planes using gl_ClipDistance, which
# clip a rectangle to a hexagon shape. Then it tests various
# combinations of enables for the 6 clipping planes, and verifies that
# they all create the correct shape.
#
# To verify that each enable works, the combinations of enables were
# chosen such that:
# - Every plane is enabled at least once and disbled at least once.
# - Every plane is enabled and disabled in a different pattern.
[require]
GLSL >= 1.30
[vertex shader]
#version 130
void main(void)
{
gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;
gl_ClipDistance[0] = gl_Vertex.y - 0.25;
gl_ClipDistance[1] = gl_Vertex.y - gl_Vertex.x + 0.4;
gl_ClipDistance[2] = 1.4 - gl_Vertex.x - gl_Vertex.y;
gl_ClipDistance[3] = 0.75 - gl_Vertex.y;
gl_ClipDistance[4] = gl_Vertex.x - gl_Vertex.y + 0.4;
gl_ClipDistance[5] = gl_Vertex.x + gl_Vertex.y - 0.6;
}
[fragment shader]
#version 130
void main(void)
{
gl_FragColor = vec4(1, 1, 1, 1);
}
[test]
ortho 0 1 0 1
clear color 0.0 0.0 0.0 0.0
# Test with planes 0, 2, and 4 enabled.
enable GL_CLIP_PLANE0
disable GL_CLIP_PLANE1
enable GL_CLIP_PLANE2
disable GL_CLIP_PLANE3
enable GL_CLIP_PLANE4
disable GL_CLIP_PLANE5
clear
draw rect 0.1 0.1 0.8 0.8
# Test points inside each hexagon edge
relative probe rgba (0.3, 0.4) (1.0, 1.0, 1.0, 1.0)
relative probe rgba (0.5, 0.3) (1.0, 1.0, 1.0, 1.0)
relative probe rgba (0.7, 0.4) (1.0, 1.0, 1.0, 1.0)
relative probe rgba (0.7, 0.6) (1.0, 1.0, 1.0, 1.0)
relative probe rgba (0.5, 0.7) (1.0, 1.0, 1.0, 1.0)
relative probe rgba (0.3, 0.6) (1.0, 1.0, 1.0, 1.0)
# Test points outside each hexagon edge
relative probe rgba (0.5, 0.2) (0.0, 0.0, 0.0, 0.0) # clipped by plane 0
relative probe rgba (0.8, 0.3) (1.0, 1.0, 1.0, 1.0) # clipped by plane 1
relative probe rgba (0.8, 0.7) (0.0, 0.0, 0.0, 0.0) # clipped by plane 2
relative probe rgba (0.5, 0.8) (1.0, 1.0, 1.0, 1.0) # clipped by plane 3
relative probe rgba (0.2, 0.7) (0.0, 0.0, 0.0, 0.0) # clipped by plane 4
relative probe rgba (0.2, 0.3) (1.0, 1.0, 1.0, 1.0) # clipped by plane 5
# Test with planes 0, 1, 4, and 5 enabled.
enable GL_CLIP_PLANE0
enable GL_CLIP_PLANE1
disable GL_CLIP_PLANE2
disable GL_CLIP_PLANE3
enable GL_CLIP_PLANE4
enable GL_CLIP_PLANE5
clear
draw rect 0.1 0.1 0.8 0.8
# Test points inside each hexagon edge
relative probe rgba (0.3, 0.4) (1.0, 1.0, 1.0, 1.0)
relative probe rgba (0.5, 0.3) (1.0, 1.0, 1.0, 1.0)
relative probe rgba (0.7, 0.4) (1.0, 1.0, 1.0, 1.0)
relative probe rgba (0.7, 0.6) (1.0, 1.0, 1.0, 1.0)
relative probe rgba (0.5, 0.7) (1.0, 1.0, 1.0, 1.0)
relative probe rgba (0.3, 0.6) (1.0, 1.0, 1.0, 1.0)
# Test points outside each hexagon edge
relative probe rgba (0.5, 0.2) (0.0, 0.0, 0.0, 0.0) # clipped by plane 0
relative probe rgba (0.8, 0.3) (0.0, 0.0, 0.0, 0.0) # clipped by plane 1
relative probe rgba (0.8, 0.7) (1.0, 1.0, 1.0, 1.0) # clipped by plane 2
relative probe rgba (0.5, 0.8) (1.0, 1.0, 1.0, 1.0) # clipped by plane 3
relative probe rgba (0.2, 0.7) (0.0, 0.0, 0.0, 0.0) # clipped by plane 4
relative probe rgba (0.2, 0.3) (0.0, 0.0, 0.0, 0.0) # clipped by plane 5
# Test with planes 0, 1, 2, and 3 enabled.
enable GL_CLIP_PLANE0
enable GL_CLIP_PLANE1
enable GL_CLIP_PLANE2
enable GL_CLIP_PLANE3
disable GL_CLIP_PLANE4
disable GL_CLIP_PLANE5
clear
draw rect 0.1 0.1 0.8 0.8
# Test points inside each hexagon edge
relative probe rgba (0.3, 0.4) (1.0, 1.0, 1.0, 1.0)
relative probe rgba (0.5, 0.3) (1.0, 1.0, 1.0, 1.0)
relative probe rgba (0.7, 0.4) (1.0, 1.0, 1.0, 1.0)
relative probe rgba (0.7, 0.6) (1.0, 1.0, 1.0, 1.0)
relative probe rgba (0.5, 0.7) (1.0, 1.0, 1.0, 1.0)
relative probe rgba (0.3, 0.6) (1.0, 1.0, 1.0, 1.0)
# Test points outside each hexagon edge
relative probe rgba (0.5, 0.2) (0.0, 0.0, 0.0, 0.0) # clipped by plane 0
relative probe rgba (0.8, 0.3) (0.0, 0.0, 0.0, 0.0) # clipped by plane 1
relative probe rgba (0.8, 0.7) (0.0, 0.0, 0.0, 0.0) # clipped by plane 2
relative probe rgba (0.5, 0.8) (0.0, 0.0, 0.0, 0.0) # clipped by plane 3
relative probe rgba (0.2, 0.7) (1.0, 1.0, 1.0, 1.0) # clipped by plane 4
relative probe rgba (0.2, 0.3) (1.0, 1.0, 1.0, 1.0) # clipped by plane 5
# Test with planes 4 and 5 enabled.
disable GL_CLIP_PLANE0
disable GL_CLIP_PLANE1
disable GL_CLIP_PLANE2
disable GL_CLIP_PLANE3
enable GL_CLIP_PLANE4
enable GL_CLIP_PLANE5
clear
draw rect 0.1 0.1 0.8 0.8
# Test points inside each hexagon edge
relative probe rgba (0.3, 0.4) (1.0, 1.0, 1.0, 1.0)
relative probe rgba (0.5, 0.3) (1.0, 1.0, 1.0, 1.0)
relative probe rgba (0.7, 0.4) (1.0, 1.0, 1.0, 1.0)
relative probe rgba (0.7, 0.6) (1.0, 1.0, 1.0, 1.0)
relative probe rgba (0.5, 0.7) (1.0, 1.0, 1.0, 1.0)
relative probe rgba (0.3, 0.6) (1.0, 1.0, 1.0, 1.0)
# Test points outside each hexagon edge
relative probe rgba (0.5, 0.2) (1.0, 1.0, 1.0, 1.0) # clipped by plane 0
relative probe rgba (0.8, 0.3) (1.0, 1.0, 1.0, 1.0) # clipped by plane 1
relative probe rgba (0.8, 0.7) (1.0, 1.0, 1.0, 1.0) # clipped by plane 2
relative probe rgba (0.5, 0.8) (1.0, 1.0, 1.0, 1.0) # clipped by plane 3
relative probe rgba (0.2, 0.7) (0.0, 0.0, 0.0, 0.0) # clipped by plane 4
relative probe rgba (0.2, 0.3) (0.0, 0.0, 0.0, 0.0) # clipped by plane 5
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