Add support for ES3 MSAA.

src/gpu/gl/GrGLCaps.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #include "GrGLCaps.h"
 #include "GrGLContext.h"
@@ skipping 368 matching lines @@
         return true;
     }
     return false;
 }
 }
 
 void GrGLCaps::initFSAASupport(const GrGLContextInfo& ctxInfo, const GrGLInterface* gli) {
 
     fMSFBOType = kNone_MSFBOType;
     if (kDesktop_GrGLBinding != ctxInfo.binding()) {
-       if (ctxInfo.hasExtension("GL_CHROMIUM_framebuffer_multisample")) {
-           // chrome's extension is equivalent to the EXT msaa
-           // and fbo_blit extensions.
-           fMSFBOType = kDesktop_EXT_MSFBOType;
-       } else if (ctxInfo.hasExtension("GL_APPLE_framebuffer_multisample")) {
-           fMSFBOType = kES_Apple_MSFBOType;
-       } else if (ctxInfo.hasExtension("GL_EXT_multisampled_render_to_texture")) {
-           fMSFBOType = kES_EXT_MsToTexture_MSFBOType;
-       } else if (ctxInfo.hasExtension("GL_IMG_multisampled_render_to_texture")) {
-           fMSFBOType = kES_IMG_MsToTexture_MSFBOType;
-       }
+        // We prefer the EXT/IMG extension over ES3 MSAA because we've observed
+        // ES3 driver bugs on at least one device with a tiled GPU (N10).
+        if (ctxInfo.hasExtension("GL_EXT_multisampled_render_to_texture")) {
+            fMSFBOType = kES_EXT_MsToTexture_MSFBOType;
+        } else if (ctxInfo.hasExtension("GL_IMG_multisampled_render_to_texture")) {
+            fMSFBOType = kES_IMG_MsToTexture_MSFBOType;
+        } else if (!GR_GL_IGNORE_ES3_MSAA && ctxInfo.version() >= GR_GL_VER(3,0)) {
+            fMSFBOType = GrGLCaps::kES_3_0_MSFBOType;
+        } else if (ctxInfo.hasExtension("GL_CHROMIUM_framebuffer_multisample")) {
+            // chrome's extension is equivalent to the EXT msaa
+            // and fbo_blit extensions.
+            fMSFBOType = kDesktop_EXT_MSFBOType;
+        } else if (ctxInfo.hasExtension("GL_APPLE_framebuffer_multisample")) {
+            fMSFBOType = kES_Apple_MSFBOType;
+        }
     } else {
         if ((ctxInfo.version() >= GR_GL_VER(3,0)) ||
             ctxInfo.hasExtension("GL_ARB_framebuffer_object")) {
             fMSFBOType = GrGLCaps::kDesktop_ARB_MSFBOType;
         } else if (ctxInfo.hasExtension("GL_EXT_framebuffer_multisample") &&
                    ctxInfo.hasExtension("GL_EXT_framebuffer_blit")) {
             fMSFBOType = GrGLCaps::kDesktop_EXT_MSFBOType;
         }
         // TODO: We could populate fMSAACoverageModes using GetInternalformativ
         // on GL 4.2+. It's format-specific, though. See also
@@ skipping 152 matching lines @@
         GrPrintf("Stencil Format %d, stencil bits: %02d, total bits: %02d\n",
                  i,
                  fStencilFormats[i].fStencilBits,
                  fStencilFormats[i].fTotalBits);
     }
 
     static const char* kMSFBOExtStr[] = {
         "None",
         "ARB",
         "EXT",
+        "ES 3.0",
         "Apple",
         "IMG MS To Texture",
         "EXT MS To Texture",
     };
     GR_STATIC_ASSERT(0 == kNone_MSFBOType);
     GR_STATIC_ASSERT(1 == kDesktop_ARB_MSFBOType);
     GR_STATIC_ASSERT(2 == kDesktop_EXT_MSFBOType);
-    GR_STATIC_ASSERT(3 == kES_Apple_MSFBOType);
-    GR_STATIC_ASSERT(4 == kES_IMG_MsToTexture_MSFBOType);
-    GR_STATIC_ASSERT(5 == kES_EXT_MsToTexture_MSFBOType);
+    GR_STATIC_ASSERT(3 == kES_3_0_MSFBOType);
+    GR_STATIC_ASSERT(4 == kES_Apple_MSFBOType);
+    GR_STATIC_ASSERT(5 == kES_IMG_MsToTexture_MSFBOType);
+    GR_STATIC_ASSERT(6 == kES_EXT_MsToTexture_MSFBOType);
     GR_STATIC_ASSERT(GR_ARRAY_COUNT(kMSFBOExtStr) == kLast_MSFBOType + 1);
 
     static const char* kFBFetchTypeStr[] = {
         "None",
         "EXT",
         "NV",
     };
     GR_STATIC_ASSERT(0 == kNone_FBFetchType);
     GR_STATIC_ASSERT(1 == kEXT_FBFetchType);
     GR_STATIC_ASSERT(2 == kNV_FBFetchType);
@@ skipping 24 matching lines @@
     GrPrintf("GL_R support: %s\n", (fTextureRedSupport ? "YES": "NO"));
     GrPrintf("GL_ARB_imaging support: %s\n", (fImagingSupport ? "YES": "NO"));
     GrPrintf("Two Format Limit: %s\n", (fTwoFormatLimit ? "YES": "NO"));
     GrPrintf("Fragment coord conventions support: %s\n",
              (fFragCoordsConventionSupport ? "YES": "NO"));
     GrPrintf("Vertex array object support: %s\n", (fVertexArrayObjectSupport ? "YES": "NO"));
     GrPrintf("Use non-VBO for dynamic data: %s\n",
              (fUseNonVBOVertexAndIndexDynamicData ? "YES" : "NO"));
     GrPrintf("Discard FrameBuffer support: %s\n", (fDiscardFBSupport ? "YES" : "NO"));
 }