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[require]
GLSL >= 1.50
GL_ARB_fragment_layer_viewport
#
# If the geometry stage makes no static assignment to gl_ViewportIndex,
# the fragment stage will read zero.
#
# This test covers the case where a GS is present, but does not write gl_ViewportIndex.
#
[vertex shader]
#version 150
in vec4 piglit_vertex;
void main()
{
gl_Position = piglit_vertex;
}
[geometry shader]
#version 150
layout(triangles) in;
layout(triangle_strip, max_vertices=3) out;
void main()
{
for (int i = 0; i < 3; i++) {
gl_Position = gl_in[i].gl_Position;
EmitVertex();
}
}
[fragment shader]
#version 150
#extension GL_ARB_fragment_layer_viewport: require
void main()
{
if (gl_ViewportIndex == 0)
gl_FragColor = vec4(0,1,0,0);
else
gl_FragColor = vec4(1,0,0,0);
}
[test]
clear color 0.0 0.0 0.0 0.0
clear
draw rect -1 -1 2 2
probe all rgb 0.0 1.0 0.0
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