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# From the GL 2.1 spec, section 2.17 (Clipping):
#
# All points with eye coordinates (x_e y_e z_e w_e)^T that satisfy
#
# (x_e)
# (p_1' p_2' p_3' p_4')(y_e) >= 0
# (z_e)
# (w_e)
#
# lie in the half-space defined by the plane; points that do not
# satisfy this condition do not lie in the half-space.
#
# This test checks that gl_ClipVertex works properly for the trivial
# case where gl_ClipVertex is a constant value not satisfying the
# above inequality.
[require]
GLSL >= 1.20
[vertex shader]
#version 120
void main(void)
{
gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;
gl_ClipVertex = vec4(-1.0, 0.0, 0.0, 0.0);
}
[fragment shader]
#version 120
void main(void)
{
gl_FragColor = vec4(1.0);
}
[test]
clear color 0.0 0.0 0.0 0.0
clear
clip plane 0 1.0 0.0 0.0 0.0 # accept points where gl_ClipVertex.x >= 0
enable GL_CLIP_PLANE0
draw rect -1 -1 2 2
probe all rgba 0.0 0.0 0.0 0.0
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