Drop support for the old "full multiplexed" MRT shaders.

src/libGLESv2/ProgramBinary.cpp

@@ -110,15 +110,7 @@ void GetDefaultInputLayoutFromShader(const std::vector<sh::Attribute> &shaderAtt
 
 std::vector<GLenum> GetDefaultOutputLayoutFromShader(const std::vector<rx::PixelShaderOuputVariable> &shaderOutputVars)
 {
-#if (ANGLE_MRT_PERF_WORKAROUND == ANGLE_WORKAROUND_ENABLED)
     std::vector<GLenum> defaultPixelOutput(1);
-#else
-    std::vector<GLenum> defaultPixelOutput(IMPLEMENTATION_MAX_DRAW_BUFFERS);
-#endif
-    for (size_t i = 0; i < defaultPixelOutput.size(); i++)
-    {
-        defaultPixelOutput[i] = GL_NONE;
-    }
 
     ASSERT(!shaderOutputVars.empty());
     defaultPixelOutput[0] = GL_COLOR_ATTACHMENT0 + shaderOutputVars[0].outputIndex;
@@ -279,9 +271,7 @@ rx::ShaderExecutable *ProgramBinary::getPixelExecutableForOutputLayout(const std
 {
     for (size_t executableIndex = 0; executableIndex < mPixelExecutables.size(); executableIndex++)
     {
-#if (ANGLE_MRT_PERF_WORKAROUND == ANGLE_WORKAROUND_ENABLED)
         if (mPixelExecutables[executableIndex]->matchesSignature(outputSignature))
-#endif
         {
             return mPixelExecutables[executableIndex]->shaderExecutable();
         }

src/libGLESv2/renderer/d3d/d3d11/renderer11_utils.cpp

@@ -394,12 +394,7 @@ static size_t GetMaximumSimultaneousRenderTargets(D3D_FEATURE_LEVEL featureLevel
       case D3D_FEATURE_LEVEL_11_0: return D3D11_SIMULTANEOUS_RENDER_TARGET_COUNT;
 
       case D3D_FEATURE_LEVEL_10_1:
-      case D3D_FEATURE_LEVEL_10_0:
-#if (ANGLE_MRT_PERF_WORKAROUND == ANGLE_WORKAROUND_ENABLED)
-          return D3D10_SIMULTANEOUS_RENDER_TARGET_COUNT;
-#else
-          return 1;
-#endif
+      case D3D_FEATURE_LEVEL_10_0: return D3D10_SIMULTANEOUS_RENDER_TARGET_COUNT;
 
       case D3D_FEATURE_LEVEL_9_3:  return D3D_FL9_3_SIMULTANEOUS_RENDER_TARGET_COUNT;
       case D3D_FEATURE_LEVEL_9_2: