Implement support for CHROMIUM_path_rendering pseudo extension

Implement support for path rendering in Chromium through
CHROMIUM_path_rendering pseudo extension.

The extension defines a new pseudo-gl function,
BindFragmentInputLocation. This behaves similarly to the
BindUniformLocation pseudo-gl function. The idea is to assign fragment
input location to a fragment input before linking the program.

BUG=chromium:344330

Review URL: https://codereview.chromium.org/1192663002

1 files changed, 7 insertions, 1 deletions

diff --git a/src/gpu/gl/GrGLInterface.cpp b/src/gpu/gl/GrGLInterface.cpp
index 56f1e59275..9f58c73221 100644
--- a/src/gpu/gl/GrGLInterface.cpp
+++ b/src/gpu/gl/GrGLInterface.cpp
@@ -59,6 +59,7 @@ const GrGLInterface* GrGLInterfaceRemoveNVPR(const GrGLInterface* interface) {
     newInterface->fFunctions.fStencilThenCoverFillPathInstanced = NULL;
     newInterface->fFunctions.fStencilThenCoverStrokePathInstanced = NULL;
     newInterface->fFunctions.fProgramPathFragmentInputGen = NULL;
+    newInterface->fFunctions.fBindFragmentInputLocation = NULL;
     return newInterface;
 }
 
@@ -483,7 +484,7 @@ bool GrGLInterface::validate() const {
 #endif
     }
 
-    if (fExtensions.has("GL_NV_path_rendering")) {
+    if (fExtensions.has("GL_NV_path_rendering") || fExtensions.has("GL_CHROMIUM_path_rendering")) {
         if (NULL == fFunctions.fMatrixLoadf ||
             NULL == fFunctions.fMatrixLoadIdentity ||
             NULL == fFunctions.fPathCommands ||
@@ -515,6 +516,11 @@ bool GrGLInterface::validate() const {
             ) {
             RETURN_FALSE_INTERFACE
         }
+        if (fExtensions.has("GL_CHROMIUM_path_rendering")) {
+            if (NULL == fFunctions.fBindFragmentInputLocation) {
+                RETURN_FALSE_INTERFACE
+            }
+        }
     }
 
     if (fExtensions.has("GL_EXT_raster_multisample")) {