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# Test that invariant qualifier is available to all shaders
#
# GLSL 1.50 section 4.6.1 (The Invariant Qualifier) says:
# To ensure that a particular output variable is invariant, it is necessary
# to use the invariant qualifier. It can either be used to qualify a
# previously declared variable as being invariant
# invariant gl_Position; // make existing gl_Position be invariant
# out vec3 Color; // make existing Color be invariant
# invariant Color;
# or as part of a declaration when a variable is declared
# invariant centroid out vec3 Color;
# The invariant qualifier must appear before any interpolation qualifiers or
# storage qualifiers when combined with a declaration. Only variables output
# from a shader (including those that are then input to a subsequent shader)
# can be candidates for invariance. This includes user-defined output variables
# and the built-in output variables. For variables leaving one shader and coming
# into another shader, the invariant keyword has to be used in both shaders,
# or a link error will result.
#
# Test is expected to pass.
[require]
GL >= 3.2
GLSL >= 1.50
[vertex shader]
#version 150
in vec4 vertex;
invariant out vec4 pos;
invariant gl_Position;
invariant out vec4 extra01;
void main()
{
gl_Position = vertex;
pos = vertex;
extra01 = vec4(1.0);
}
[geometry shader]
#version 150
layout(triangles) in;
layout(triangle_strip, max_vertices=3) out;
invariant in vec4 pos[];
invariant in vec4 extra01[];
invariant out vec4 extra02;
void main()
{
for(int i = 0; i < 3; i++) {
gl_Position = pos[i] * 0.5;
extra02 = extra01[i] * 0.5;
EmitVertex();
}
}
[fragment shader]
#version 150
in vec4 extra02;
invariant extra02; //should be legal according to example
out vec4 FragColor;
void main()
{
FragColor = vec4(extra02);
}
[vertex data]
vertex/float/2
-1.0 -1.0
1.0 -1.0
1.0 1.0
-1.0 1.0
[test]
draw arrays GL_TRIANGLE_FAN 0 4
probe all rgba 0.5 0.5 0.5 0.5
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