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[Daniel van Vugt <daniel.van.vugt@xxxxxxxxxxxxx>]

** Changed in: mir
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1350674

Title:
  GLRenderer: The default fragment shader is sub-optimal for alpha=1.0

Status in Mir:
  Fix Released
Status in mir package in Ubuntu:
  Fix Released

Bug description:
  GLRenderer: The default fragment shader is sub-optimal for alpha=1.0.
  It needlessly multiplies all four colour components on every
  fragment...

  const GLchar* fragment_shader_src =
  {
      "precision mediump float;\n"
      "uniform sampler2D tex;\n"
      "uniform float alpha;\n"
      "varying vec2 v_texcoord;\n"
      "void main() {\n"
      "   vec4 frag = texture2D(tex, v_texcoord);\n"
      "   gl_FragColor = alpha*frag;\n"
      "}\n"
  };

  If alpha is 1.0 (as it usually is) then we should take a more
  efficient shader than that.

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