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# Check that triangles delivered to the geometry shader using
# GL_TRIANGLE_STRIP have the correct orientation.
#
# It works by rendering 4 triangles in a strip and using
# gl_FrontFacing to check that they all have the same orientation.
[require]
GL >= 2.0
GLSL >= 1.50
[vertex shader]
in vec4 vertex;
out vec4 vertex_to_gs;
void main()
{
vertex_to_gs = vertex;
}
[geometry shader]
layout(triangles) in;
layout(triangle_strip, max_vertices = 3) out;
in vec4 vertex_to_gs[3];
void main()
{
for (int i = 0; i < 3; i++) {
gl_Position = vertex_to_gs[i];
EmitVertex();
}
}
[fragment shader]
void main()
{
if (gl_FrontFacing)
gl_FragColor = vec4(0.0, 1.0, 0.0, 1.0);
else
gl_FragColor = vec4(1.0, 0.0, 0.0, 1.0);
}
[vertex data]
vertex/float/2
-1.0 -1.0
1.0 -1.0
-1.0 0.0
1.0 0.0
-1.0 1.0
1.0 1.0
[test]
draw arrays GL_TRIANGLE_STRIP 0 6
probe all rgba 0.0 1.0 0.0 1.0
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