Use a A8R8G8B8 fbo to apply mlaa.

src/graphics/post_processing.cpp

@@ -846,8 +846,12 @@ void PostProcessing::render()
         if (UserConfigParams::m_mlaa) // MLAA. Must be the last pp filter.
         {
             PROFILER_PUSH_CPU_MARKER("- MLAA", 0xFF, 0x00, 0x00);
+            glDisable(GL_BLEND);
+            drv->setRenderTarget(irr_driver->getRTT(RTT_FINAL_COLOR), false, false);
+            renderPassThrough(in);
             drv->setRenderTarget(out, false, false);
-            applyMLAA(in, out);
+            applyMLAA(irr_driver->getRTT(RTT_FINAL_COLOR), out);
+            in = irr_driver->getRTT(RTT_FINAL_COLOR);
             PROFILER_POP_CPU_MARKER();
         }
 

src/graphics/rtts.cpp

@@ -59,6 +59,7 @@ RTT::RTT()
     rtts[RTT_TMP4] = drv->addRenderTargetTexture(res, "rtt.tmp4", ECF_R16F, stencil);
     rtts[RTT_NORMAL_AND_DEPTH] = drv->addRenderTargetTexture(res, "rtt.normal_and_depth", ECF_G16R16F, stencil);
     rtts[RTT_COLOR] = drv->addRenderTargetTexture(res, "rtt.color", ECF_A16B16G16R16F, stencil);
+    rtts[RTT_FINAL_COLOR] = drv->addRenderTargetTexture(res, "rtt.finalcolor", ECF_A8R8G8B8, stencil);
     rtts[RTT_LOG_LUMINANCE] = drv->addRenderTargetTexture(shadowsize0, "rtt.logluminance", ECF_R16F, stencil);
 
     rtts[RTT_HALF1] = drv->addRenderTargetTexture(half, "rtt.half1", ECF_A16B16G16R16F, stencil);

src/graphics/rtts.hpp

@@ -62,6 +62,7 @@ enum TypeRTT
     RTT_HALF_SOFT,
 
     RTT_DISPLACE,
+    RTT_FINAL_COLOR,
 
     RTT_COUNT
 };