Add glReadBuffer to GrGLInterface.

Review URL: http://codereview.appspot.com/4841048/





git-svn-id: http://skia.googlecode.com/svn/trunk@2034 2bbb7eff-a529-9590-31e7-b0007b416f81

gpu/include/GrGLInterface.h

@@ -136,6 +136,7 @@ extern "C" {
     typedef GrGLvoid (GR_GL_FUNCTION_TYPE *GrGLMatrixModeProc)(GrGLenum mode);
     typedef GrGLvoid (GR_GL_FUNCTION_TYPE *GrGLPixelStoreiProc)(GrGLenum pname, GrGLint param);
     typedef GrGLvoid (GR_GL_FUNCTION_TYPE *GrGLPointSizeProc)(GrGLfloat size);
+    typedef GrGLvoid (GR_GL_FUNCTION_TYPE *GrGLReadBufferProc)(GrGLenum src);
     typedef GrGLvoid (GR_GL_FUNCTION_TYPE *GrGLReadPixelsProc)(GrGLint x, GrGLint y, GrGLsizei width, GrGLsizei height, GrGLenum format, GrGLenum type, GrGLvoid* pixels);
     typedef GrGLvoid (GR_GL_FUNCTION_TYPE *GrGLScissorProc)(GrGLint x, GrGLint y, GrGLsizei width, GrGLsizei height);
     typedef GrGLvoid (GR_GL_FUNCTION_TYPE *GrGLShadeModelProc)(GrGLenum mode);
@@ -291,6 +292,7 @@ struct GrGLInterface {
     GrGLMatrixModeProc fMatrixMode;
     GrGLPixelStoreiProc fPixelStorei;
     GrGLPointSizeProc fPointSize;
+    GrGLReadBufferProc fReadBuffer;
     GrGLReadPixelsProc fReadPixels;
     GrGLScissorProc fScissor;
     GrGLShadeModelProc fShadeModel;

gpu/src/GrGLInterface.cpp

@@ -313,7 +313,8 @@ bool GrGLInterface::validate(GrEngine engine) const {
     if (kDesktop_GrGLBinding == fBindingsExported &&
         (NULL == fLineWidth ||
          NULL == fGetTexLevelParameteriv ||
-         NULL == fDrawBuffer)) {
+         NULL == fDrawBuffer ||
+         NULL == fReadBuffer)) {
         return false;
     }
 

gpu/src/android/GrGLDefaultInterface_android.cpp

@@ -77,6 +77,7 @@ void GrGLSetDefaultGLInterface() {
     NULL,  // glMatrixMode
     glPixelStorei,
     NULL,  // glPointSize
+    NULL, // glReadBuffer
     glReadPixels,
     glScissor,
     NULL,  // glShadeModel

gpu/src/ios/GrGLDefaultInterface_iOS.cpp

@@ -76,6 +76,7 @@ void GrGLSetDefaultGLInterface() {
         gDefaultInterface.fMatrixMode = glMatrixMode;
         gDefaultInterface.fPointSize = glPointSize;
         gDefaultInterface.fPixelStorei = glPixelStorei;
+        gDefaultInterface.fReadBuffer = NULL; 
         gDefaultInterface.fReadPixels = glReadPixels;
         gDefaultInterface.fScissor = glScissor;
         gDefaultInterface.fShadeModel = glShadeModel;

gpu/src/mac/GrGLDefaultInterface_mac.cpp

@@ -77,6 +77,7 @@ void GrGLSetDefaultGLInterface() {
         gDefaultInterface.fMatrixMode = glMatrixMode;
         gDefaultInterface.fPointSize = glPointSize;
         gDefaultInterface.fPixelStorei = glPixelStorei;
+        gDefaultInterface.fReadBuffer = glReadBuffer;
         gDefaultInterface.fReadPixels = glReadPixels;
         gDefaultInterface.fScissor = glScissor;
         gDefaultInterface.fShadeModel = glShadeModel;

gpu/src/mesa/GrGLDefaultInterface_mesa.cpp

@@ -91,6 +91,7 @@ void GrGLSetDefaultGLInterface() {
         gDefaultInterface.fMatrixMode = glMatrixMode;
         gDefaultInterface.fPointSize = glPointSize;
         gDefaultInterface.fPixelStorei = glPixelStorei;
+        gDefaultInterface.fReadBuffer = glReadBuffer;
         gDefaultInterface.fReadPixels = glReadPixels;
         gDefaultInterface.fScissor = glScissor;
         gDefaultInterface.fShadeModel = glShadeModel;

gpu/src/unix/GrGLDefaultInterface_unix.cpp

@@ -93,6 +93,7 @@ void GrGLSetDefaultGLInterface() {
         gDefaultInterface.fMatrixMode = glMatrixMode;
         gDefaultInterface.fPointSize = glPointSize;
         gDefaultInterface.fPixelStorei = glPixelStorei;
+        gDefaultInterface.fReadBuffer = glReadBuffer;
         gDefaultInterface.fReadPixels = glReadPixels;
         gDefaultInterface.fScissor = glScissor;
         gDefaultInterface.fShadeModel = glShadeModel;

gpu/src/win/GrGLDefaultInterface_win.cpp

@@ -72,6 +72,7 @@ void GrGLSetDefaultGLInterface() {
             gDefaultInterface.fMatrixMode = glMatrixMode;
             gDefaultInterface.fPixelStorei = glPixelStorei;
             gDefaultInterface.fPointSize = glPointSize;
+            gDefaultInterface.fReadBuffer = glReadBuffer;
             gDefaultInterface.fReadPixels = glReadPixels;
             gDefaultInterface.fScissor = glScissor;
             gDefaultInterface.fShadeModel = glShadeModel;