hwui: add extension to support unpack operations in OpenGL ES 2.0
OpenGL ES 3.0+ lets us specify the row length for unpack operations
such as glTexSubImage2D(). This allows us to upload a sub-rectangle
of a texture. Also, the GL_EXT_unpack_subimage extension can also
support this feature in OpenGL ES 2.0
Change-Id: Id43c2c55c5eaefbace67087c955f0b4324fb2c35
Signed-off-by: xiaozhengdong <xiaozhengdong@xiaomi.com>
diff --git a/libs/hwui/Extensions.cpp b/libs/hwui/Extensions.cpp
index 84e7e65..25004b6 100644
--- a/libs/hwui/Extensions.cpp
+++ b/libs/hwui/Extensions.cpp
@@ -61,6 +61,7 @@
mHasTiledRendering = hasGlExtension("GL_QCOM_tiled_rendering");
mHas1BitStencil = hasGlExtension("GL_OES_stencil1");
mHas4BitStencil = hasGlExtension("GL_OES_stencil4");
+ mHasUnpackSubImage = hasGlExtension("GL_EXT_unpack_subimage");
// Query EGL extensions
findExtensions(eglQueryString(eglGetCurrentDisplay(), EGL_EXTENSIONS), mEglExtensionList);