[Bug 84677] Triangle disappears with glPolygonMode GL_LINE

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=84677

--- Comment #1 from Ben Foppa <benjamin.foppa at gmail.com> ---
shaders accompanying main.c:

fragment shader:

    #version 330 core

    out vec4 frag_color;

    void main() {
      frag_color = vec4(1, 1, 0, 1); 
    }

vertex shader:

    #version 330 core

    void main() {
      if(gl_VertexID == 0) {
        gl_Position = vec4(-1, -1, 0, 1);
      } else if(gl_VertexID == 1) {
        gl_Position = vec4(1, -1, 0, 1);
      } else if(gl_VertexID == 2) {
        gl_Position = vec4(-1, 1, 0, 1);
      }
    }

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