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# This test sets up 6 clipping planes using gl_ClipVertex, 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.
#
# Note: Some implementations have bugs related to improper coordinate
# transformations of clip planes (which are already adequately tested
# by the clip-plane-transformation test), so to avoid those bugs
# contaminating the results of this test, we don't do any coordinate
# transformation in this test.
[require]
GL COMPAT >= 3.2
GLSL >= 1.50
GL_ARB_tessellation_shader
[vertex shader]
#version 150 compatibility
in vec4 piglit_vertex;
void main(void)
{
gl_Position = piglit_vertex;
gl_ClipVertex = gl_Position;
}
[tessellation control shader]
#version 150 compatibility
#extension GL_ARB_tessellation_shader: require
layout(vertices = 3) out;
void main() {
gl_out[gl_InvocationID].gl_Position = gl_in[gl_InvocationID].gl_Position;
gl_out[gl_InvocationID].gl_ClipVertex = gl_in[gl_InvocationID].gl_ClipVertex;
gl_TessLevelOuter = float[4](1.0, 1.0, 1.0, 0.0);
gl_TessLevelInner = float[2](0.0, 0.0);
}
[tessellation evaluation shader]
#version 150 compatibility
#extension GL_ARB_tessellation_shader: require
layout(triangles) in;
void main() {
gl_Position = gl_in[0].gl_Position * gl_TessCoord[0]
+ gl_in[1].gl_Position * gl_TessCoord[1]
+ gl_in[2].gl_Position * gl_TessCoord[2];
gl_ClipVertex = gl_in[0].gl_ClipVertex * gl_TessCoord[0]
+ gl_in[1].gl_ClipVertex * gl_TessCoord[1]
+ gl_in[2].gl_ClipVertex * gl_TessCoord[2];
}
[fragment shader]
#version 120
void main(void)
{
gl_FragColor = vec4(1, 1, 1, 1);
}
[vertex data]
piglit_vertex/float/2
-1.0 -1.0
1.0 -1.0
-1.0 1.0
-1.0 1.0
1.0 -1.0
1.0 1.0
[test]
clip plane 0 0 1 0 0.5
clip plane 1 -1 1 0 0.8
clip plane 2 -1 -1 0 0.8
clip plane 3 0 -1 0 0.5
clip plane 4 1 -1 0 0.8
clip plane 5 1 1 0 0.8
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
patch parameter vertices 3
draw arrays GL_PATCHES 0 6
# 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
patch parameter vertices 3
draw arrays GL_PATCHES 0 6
# 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
patch parameter vertices 3
draw arrays GL_PATCHES 0 6
# 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
patch parameter vertices 3
draw arrays GL_PATCHES 0 6
# 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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