Add transfer buffer to GLCaps

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 "GrContextOptions.h"
 #include "GrGLContext.h"
 #include "glsl/GrGLSLCaps.h"
 #include "SkTSearch.h"
 #include "SkTSort.h"
 
 GrGLCaps::GrGLCaps(const GrContextOptions& contextOptions,
                    const GrGLContextInfo& ctxInfo,
                    const GrGLInterface* glInterface) : INHERITED(contextOptions) {
     fVerifiedColorConfigs.reset();
     fStencilFormats.reset();
     fMSFBOType = kNone_MSFBOType;
     fInvalidateFBType = kNone_InvalidateFBType;
     fLATCAlias = kLATC_LATCAlias;
     fMapBufferType = kNone_MapBufferType;
+    fTransferBufferType = kNone_TransferBufferType;
     fMaxFragmentUniformVectors = 0;
     fMaxVertexAttributes = 0;
     fMaxFragmentTextureUnits = 0;
     fRGBA8RenderbufferSupport = false;
     fBGRAIsInternalFormat = false;
     fUnpackRowLengthSupport = false;
     fUnpackFlipYSupport = false;
     fPackRowLengthSupport = false;
     fPackFlipYSupport = false;
     fTextureUsageSupport = false;
@@ skipping 327 matching lines @@
             fMapBufferType = kChromium_MapBufferType;
         } else if (version >= GR_GL_VER(3, 0) || ctxInfo.hasExtension("GL_EXT_map_buffer_range")) {
             fMapBufferFlags = kCanMap_MapFlag | kSubset_MapFlag;
             fMapBufferType = kMapBufferRange_MapBufferType;
         } else if (ctxInfo.hasExtension("GL_OES_mapbuffer")) {
             fMapBufferFlags = kCanMap_MapFlag;
             fMapBufferType = kMapBuffer_MapBufferType;
         }
     }
 
+    if (kGL_GrGLStandard == standard) {
+        if (version >= GR_GL_VER(3, 0) || ctxInfo.hasExtension("GL_ARB_pixel_buffer_object")) {
+            fTransferBufferType = kPBO_TransferBufferType;
+        } 
+    } else {
+        if (version >= GR_GL_VER(3, 0) || ctxInfo.hasExtension("GL_NV_pixel_buffer_object")) {
+            fTransferBufferType = kPBO_TransferBufferType;
+        } else if (ctxInfo.hasExtension("GL_CHROMIUM_pixel_transfer_buffer_object")) {
+            fTransferBufferType = kChromium_TransferBufferType;
+        }
+    }
+
     // On many GPUs, map memory is very expensive, so we effectively disable it here by setting the
     // threshold to the maximum unless the client gives us a hint that map memory is cheap.
     if (fGeometryBufferMapThreshold < 0) {
         // We think mapping on Chromium will be cheaper once we know ahead of time how much space
         // we will use for all GrBatchs. Right now we might wind up mapping a large buffer and using
         // a small subset.
 #if 0
         fGeometryBufferMapThreshold = kChromium_GrGLDriver == ctxInfo.driver() ? 0 : SK_MaxS32;
 #else
         fGeometryBufferMapThreshold = SK_MaxS32;
@@ skipping 951 matching lines @@
     glslCaps->fConfigSwizzle[kR11_EAC_GrPixelConfig] = "rrrr";
     glslCaps->fConfigSwizzle[kASTC_12x12_GrPixelConfig] = "rgba";
     glslCaps->fConfigSwizzle[kRGBA_float_GrPixelConfig] = "rgba";
     glslCaps->fConfigSwizzle[kRGBA_half_GrPixelConfig] = "rgba";
 
 }
 
 void GrGLCaps::onApplyOptionsOverrides(const GrContextOptions& options) {}