Add tokens and entry points for KHR_blend_equation_advanced

src/gpu/gl/GrGLDefines.h

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 
 #ifndef GrGLDefines_DEFINED
@@ skipping 27 matching lines @@
 /* AlphaFunction (not supported in ES20) */
 /*      GL_NEVER */
 /*      GL_LESS */
 /*      GL_EQUAL */
 /*      GL_LEQUAL */
 /*      GL_GREATER */
 /*      GL_NOTEQUAL */
 /*      GL_GEQUAL */
 /*      GL_ALWAYS */
 
+/* Basic OpenGL blend equations */
+#define GR_GL_FUNC_ADD                       0x8006
+#define GR_GL_FUNC_SUBTRACT                  0x800A
+#define GR_GL_FUNC_REVERSE_SUBTRACT          0x800B
+
+/* GL_KHR_blend_equation_advanced */
+#define GR_GL_SCREEN                         0x9295
+#define GR_GL_OVERLAY                        0x9296
+#define GR_GL_DARKEN                         0x9297
+#define GR_GL_LIGHTEN                        0x9298
+#define GR_GL_COLORDODGE                     0x9299
+#define GR_GL_COLORBURN                      0x929A
+#define GR_GL_HARDLIGHT                      0x929B
+#define GR_GL_SOFTLIGHT                      0x929C
+#define GR_GL_DIFFERENCE                     0x929E
+#define GR_GL_EXCLUSION                      0x92A0
+#define GR_GL_MULTIPLY                       0x9294
+#define GR_GL_HSL_HUE                        0x92AD
+#define GR_GL_HSL_SATURATION                 0x92AE
+#define GR_GL_HSL_COLOR                      0x92AF
+#define GR_GL_HSL_LUMINOSITY                 0x92B0
+
 /* BlendingFactorDest */
 #define GR_GL_ZERO                           0
 #define GR_GL_ONE                            1
 #define GR_GL_SRC_COLOR                      0x0300
 #define GR_GL_ONE_MINUS_SRC_COLOR            0x0301
 #define GR_GL_SRC_ALPHA                      0x0302
 #define GR_GL_ONE_MINUS_SRC_ALPHA            0x0303
 #define GR_GL_DST_ALPHA                      0x0304
 #define GR_GL_ONE_MINUS_DST_ALPHA            0x0305
 
@@ skipping 792 matching lines @@
 // NV_path_rendering extension to EXT_direct_state_access:
 // [the matrix functions] must support the PATH_PROJECTION_NV and
 // PATH_MODELVIEW_NV tokens for matrixMode.
 #define GR_GL_PATH_PROJECTION                               0x1701
 #define GR_GL_PATH_MODELVIEW                                0x1700
 
 /*  ARM specific define for MSAA support on framebuffer fetch */
 #define GR_GL_FETCH_PER_SAMPLE_ARM                          0x8F65
 
 #endif