[Mesa-dev] [Bug 29185] New: [glsl2] GL_ARB_draw_buffers unsupported in vertex shader

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=29185

           Summary: [glsl2] GL_ARB_draw_buffers unsupported in vertex
                    shader
           Product: Mesa
           Version: git
          Platform: All
        OS/Version: Linux (All)
            Status: NEW
          Severity: minor
          Priority: medium
         Component: Mesa core
        AssignedTo: mesa-dev at lists.freedesktop.org
        ReportedBy: gordon.jin at intel.com


piglit/tests/glslparsertest/glsl2/draw_buffers-05.vert was changed
(http://cgit.freedesktop.org/piglit/commit/?id=48fc4beee7ae3818eef746396749be5e00ae670a)
to expect GL_ARB_draw_buffers supported in vertex shader (for version 1.10).

But mesa glsl2 branch still considers not to support it in vertex shader:
src/glsl/glsl_parser_extras.cpp:
   } else if (strcmp(name, "GL_ARB_draw_buffers") == 0) {
      /* This extension is only supported in fragment shaders.
       */
      if (state->target != fragment_shader) {
         unsupported = true;
      } else {
         state->ARB_draw_buffers_enable = (ext_mode != extension_disable);
         state->ARB_draw_buffers_warn = (ext_mode == extension_warn);
      }

so the piglit case fails to compile with error: 
extension `GL_ARB_draw_buffers' unsupported in vertex shader

It passes with mesa master branch.

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