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# From section 7.1 (Built-In Language Variables) of the GLSL 4.10
# spec:
#
# The gl_PerVertex block can be redeclared in a shader to explicitly
# indicate what subset of the fixed pipeline interface will be
# used. This is necessary to establish the interface between multiple
# programs. For example:
#
# out gl_PerVertex {
# vec4 gl_Position; // will use gl_Position
# float gl_PointSize; // will use gl_PointSize
# vec4 t; // error, only gl_PerVertex members allowed
# }; // no other members of gl_PerVertex will be used
#
# This establishes the output interface the shader will use with the
# subsequent pipeline stage. It must be a subset of the built-in members
# of gl_PerVertex.
#
# This appears to be a clarification to the behaviour established for
# gl_PerVertex by GLSL 1.50, therefore we test it using GLSL version
# 1.50.
#
# Note that this test is verifying functionality when gl_PerVertex is
# correctly redeclared, so it doesn't include the erroneous "vec4 t"
# declaration.
#
# This test verifies that the vertex shader can redeclare gl_PerVertex
# specifying a subset of the built-in values (gl_Position and
# gl_PointSize), and the subset works.
#
# This test draws a small point in the left half of the window and a
# large point in the right half. Then it probes the region around
# each point to ensure that the point on the right is larger.
#
# NOTE: since gl_PointSize is expressed in pixels, but gl_Position is
# expressed relative to the window size, this test is dependent upon
# the window size. It uses a window size of 250x250, which is
# specified as the size requirement for the test.
[require]
GLSL >= 1.50
SIZE 250 250
[vertex shader]
in vec4 pos;
in float point_size;
out gl_PerVertex {
vec4 gl_Position;
float gl_PointSize;
};
void main()
{
gl_Position = pos;
gl_PointSize = point_size;
}
[fragment shader]
void main()
{
gl_FragColor = vec4(1.0);
}
[vertex data]
pos/float/4 point_size/float/1
-0.5 0.0 0.0 1.0 1.0
0.5 0.0 0.0 1.0 13.0
[test]
clear color 0.0 0.0 0.0 0.0
clear
enable GL_PROGRAM_POINT_SIZE
draw arrays GL_POINTS 0 2
relative probe rgba (0.24, 0.5) (0.0, 0.0, 0.0, 0.0)
relative probe rgba (0.26, 0.5) (0.0, 0.0, 0.0, 0.0)
relative probe rgba (0.74, 0.5) (1.0, 1.0, 1.0, 1.0)
relative probe rgba (0.76, 0.5) (1.0, 1.0, 1.0, 1.0)
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