Add GL_CHROMIUM_map_sub functions to GrGLInterface and bit to GrGLCaps.

BUG=skia:2402
R=robertphillips@google.com

Author: bsalomon@google.com

Review URL: https://codereview.chromium.org/231773003

git-svn-id: http://skia.googlecode.com/svn/trunk@14199 2bbb7eff-a529-9590-31e7-b0007b416f81

3 files changed, 18 insertions, 1 deletions

diff --git a/src/gpu/gl/GrGLCaps.cpp b/src/gpu/gl/GrGLCaps.cpp
index ae9bb742e3..e20f932f0e 100644
--- a/src/gpu/gl/GrGLCaps.cpp
+++ b/src/gpu/gl/GrGLCaps.cpp
@@ -48,13 +48,14 @@ void GrGLCaps::reset() {
     fFixedFunctionSupport = false;
     fFullClearIsFree = false;
     fDropsTileOnZeroDivide = false;
+    fMapSubSupport = false;
 }
 
 GrGLCaps::GrGLCaps(const GrGLCaps& caps) : GrDrawTargetCaps() {
     *this = caps;
 }
 
-GrGLCaps& GrGLCaps::operator = (const GrGLCaps& caps) {
+GrGLCaps& GrGLCaps::operator= (const GrGLCaps& caps) {
     INHERITED::operator=(caps);
     fVerifiedColorConfigs = caps.fVerifiedColorConfigs;
     fStencilFormats = caps.fStencilFormats;
@@ -86,6 +87,7 @@ GrGLCaps& GrGLCaps::operator = (const GrGLCaps& caps) {
     fFixedFunctionSupport = caps.fFixedFunctionSupport;
     fFullClearIsFree = caps.fFullClearIsFree;
     fDropsTileOnZeroDivide = caps.fDropsTileOnZeroDivide;
+    fMapSubSupport = caps.fMapSubSupport;
 
     return *this;
 }
@@ -293,8 +295,10 @@ void GrGLCaps::init(const GrGLContextInfo& ctxInfo, const GrGLInterface* gli) {
     if (kGL_GrGLStandard == standard) {
         fBufferLockSupport = true; // we require VBO support and the desktop VBO extension includes
                                    // glMapBuffer.
+        fMapSubSupport = false;
     } else {
         fBufferLockSupport = ctxInfo.hasExtension("GL_OES_mapbuffer");
+        fMapSubSupport = ctxInfo.hasExtension("GL_CHROMIUM_map_sub");
     }
 
     if (kGL_GrGLStandard == standard) {
diff --git a/src/gpu/gl/GrGLCaps.h b/src/gpu/gl/GrGLCaps.h
index 4cde2bd5f7..1ba21ec72f 100644
--- a/src/gpu/gl/GrGLCaps.h
+++ b/src/gpu/gl/GrGLCaps.h
@@ -259,6 +259,9 @@ public:
 
     bool dropsTileOnZeroDivide() const { return fDropsTileOnZeroDivide; }
 
+    /// Is GL_CHROMIUM_map_sub supported?
+    bool mapSubSupport() const { return fMapSubSupport; }
+
 private:
     /**
      * Maintains a bit per GrPixelConfig. It is used to avoid redundantly
@@ -341,6 +344,7 @@ private:
     bool fFixedFunctionSupport : 1;
     bool fFullClearIsFree : 1;
     bool fDropsTileOnZeroDivide : 1;
+    bool fMapSubSupport : 1;
 
     typedef GrDrawTargetCaps INHERITED;
 };
diff --git a/src/gpu/gl/GrGLInterface.cpp b/src/gpu/gl/GrGLInterface.cpp
index c5ab39ac7b..bfffdfb192 100644
--- a/src/gpu/gl/GrGLInterface.cpp
+++ b/src/gpu/gl/GrGLInterface.cpp
@@ -504,6 +504,15 @@ bool GrGLInterface::validate() const {
             RETURN_FALSE_INTERFACE;
         }
     }
+
+    if (kGLES_GrGLStandard == fStandard && fExtensions.has("GL_CHROMIUM_map_sub")) {
+        if (NULL == fFunctions.fMapBufferSubData ||
+            NULL == fFunctions.fMapTexSubImage2D ||
+            NULL == fFunctions.fUnmapBufferSubData ||
+            NULL == fFunctions.fUnmapTexSubImage2D) {
+            RETURN_FALSE_INTERFACE;
+        }
+    }
 #endif
 
     return true;