commit 28f9c606e4c8e61015e864219c4bc83a3fdb4a86
author jvanverth <jvanverth@google.com> Fri Dec 05 13:06:35 2014 -0800
committer Commit bot <commit-bot@chromium.org> Fri Dec 05 13:06:35 2014 -0800
tree df7daea5295de1dcbeeb72d34bd58cbc0a4ca3a9
parent 915187b71d4068f21a15a1b8f4d919e1179d8b74

Add support for half float alpha textures.

This allows us to create distance field textures with better precision,
which may help text quality.

BUG=skia:3103

Review URL: https://codereview.chromium.org/762923003

src/gpu/gl/GrGLDefines.h

diff --git a/src/gpu/gl/GrGLDefines.h b/src/gpu/gl/GrGLDefines.h
index 68d8da8..dc9468f 100644
--- a/src/gpu/gl/GrGLDefines.h
+++ b/src/gpu/gl/GrGLDefines.h
@@ -302,7 +302,9 @@
 #define GR_GL_INT                            0x1404
 #define GR_GL_UNSIGNED_INT                   0x1405
 #define GR_GL_FLOAT                          0x1406
+#define GR_GL_HALF_FLOAT                     0x140B
 #define GR_GL_FIXED                          0x140C
+#define GR_GL_HALF_FLOAT_OES                 0x8D61
 
 /* Lighting */
 #define GR_GL_LIGHTING                       0x0B50
@@ -379,6 +381,8 @@
 #define GR_GL_ALPHA8                         0x803C
 
 #define GR_GL_R8                             0x8229
+#define GR_GL_R16F                           0x822D
+#define GR_GL_ALPHA16F                       0x881C
 
 /* PixelType */
 /*      GL_UNSIGNED_BYTE */