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# From the GLSL 1.30 spec section 7.1 (Vertex Shader Special
# Variables):
#
# The gl_ClipDistance array is predeclared as unsized and must be
# sized by the shader either redeclaring it with a size or indexing
# it only with integral constant expressions. This needs to size the
# array to include all the clip planes that are enabled via the
# OpenGL API; if the size does not include all enabled planes,
# results are undefined. The size can be at most
# gl_MaxClipDistances. The number of varying components (see
# gl_MaxVaryingComponents) consumed by gl_ClipDistance will match
# the size of the array, no matter how many planes are enabled. The
# shader must also set all values in gl_ClipDistance that have been
# enabled via the OpenGL API, or results are undefined. Values
# written into gl_ClipDistance for planes that are not enabled have
# no effect.
#
# This test checks that the GLSL compiler respects the size of
# gl_ClipDistance when it is implicitly sized in the vertex shader by
# indexing into it with integral constant expressions.
#
# The spec isn't clear about whether it's necessary for the GLSL
# compiler to size gl_ClipDistance to the minimum size possible. In
# other words, if only gl_ClipDistance[2] is accessed, must the
# compiler infer that the size of gl_ClipDistance is 3, or is any size
# greater than or equal to 3 acceptable? This test assumes any size
# greater than or equal to 3 is acceptable.
[require]
GLSL >= 1.30
[vertex shader]
#version 130
void main()
{
gl_Position = gl_Vertex;
gl_FrontColor = (gl_ClipDistance.length() >= 3) ? vec4(0.0, 1.0, 0.0, 1.0)
: vec4(1.0, 0.0, 0.0, 1.0);
gl_ClipDistance[2] = 1.0;
}
[fragment shader]
#version 130
void main()
{
gl_FragColor = gl_Color;
}
[test]
draw rect -1 -1 2 2
probe all rgba 0.0 1.0 0.0 1.0
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