From f4dcb5de4e46d7b511b530375ef77e9946b89ff0 Mon Sep 17 00:00:00 2001
From: Brian Paul <brianp@vmware.com>
Date: Tue, 20 Apr 2010 16:13:08 -0600
Subject: [PATCH] mesa: better, smaller error handling code for
 glEnable/Disable/IsEnabled()

Use a goto instead of replicating the _mesa_error() call many times.
enable.o is about 15% smaller.
---
 src/mesa/main/enable.c | 53 +++++++++++++++++++++++++++-----------------------
 1 file changed, 29 insertions(+), 24 deletions(-)

diff --git a/src/mesa/main/enable.c b/src/mesa/main/enable.c
index f9decc3..d24564c 100644
--- a/src/mesa/main/enable.c
+++ b/src/mesa/main/enable.c
@@ -42,9 +42,7 @@
 
 #define CHECK_EXTENSION(EXTNAME, CAP)					\
    if (!ctx->Extensions.EXTNAME) {					\
-      _mesa_error(ctx, GL_INVALID_ENUM, "gl%sClientState(0x%x)",	\
-                  state ? "Enable" : "Disable", CAP);			\
-      return;								\
+      goto invalid_enum_error;						\
    }
 
 
@@ -127,9 +125,7 @@ client_state(GLcontext *ctx, GLenum cap, GLboolean state)
 #endif /* FEATURE_NV_vertex_program */
 
       default:
-         _mesa_error( ctx, GL_INVALID_ENUM,
-                      "glEnable/DisableClientState(0x%x)", cap);
-         return;
+         goto invalid_enum_error;
    }
 
    if (*var == state)
@@ -150,6 +146,12 @@ client_state(GLcontext *ctx, GLenum cap, GLboolean state)
    if (ctx->Driver.Enable) {
       ctx->Driver.Enable( ctx, cap, state );
    }
+
+   return;
+
+invalid_enum_error:
+   _mesa_error(ctx, GL_INVALID_ENUM, "gl%sClientState(0x%x)",
+               state ? "Enable" : "Disable", cap);
 }
 
 
@@ -188,16 +190,12 @@ _mesa_DisableClientState( GLenum cap )
 #undef CHECK_EXTENSION
 #define CHECK_EXTENSION(EXTNAME, CAP)					\
    if (!ctx->Extensions.EXTNAME) {					\
-      _mesa_error(ctx, GL_INVALID_ENUM, "gl%s(0x%x)",			\
-                  state ? "Enable" : "Disable", CAP);			\
-      return;								\
+      goto invalid_enum_error;						\
    }
 
 #define CHECK_EXTENSION2(EXT1, EXT2, CAP)				\
    if (!ctx->Extensions.EXT1 && !ctx->Extensions.EXT2) {		\
-      _mesa_error(ctx, GL_INVALID_ENUM, "gl%s(0x%x)",			\
-                  state ? "Enable" : "Disable", CAP);			\
-      return;								\
+      goto invalid_enum_error;						\
    }
 
 
@@ -993,14 +991,18 @@ _mesa_set_enable(GLcontext *ctx, GLenum cap, GLboolean state)
 #endif
 
       default:
-         _mesa_error(ctx, GL_INVALID_ENUM,
-                     "%s(0x%x)", state ? "glEnable" : "glDisable", cap);
-         return;
+         goto invalid_enum_error;
    }
 
    if (ctx->Driver.Enable) {
       ctx->Driver.Enable( ctx, cap, state );
    }
+
+   return;
+
+invalid_enum_error:
+   _mesa_error(ctx, GL_INVALID_ENUM, "gl%s(0x%x)",
+               state ? "Enable" : "Disable", cap);
 }
 
 
@@ -1043,7 +1045,7 @@ _mesa_set_enablei(GLcontext *ctx, GLenum cap, GLuint index, GLboolean state)
    switch (cap) {
    case GL_BLEND:
       if (!ctx->Extensions.EXT_draw_buffers2) {
-         goto bad_cap_error;
+         goto invalid_enum_error;
       }
       if (index >= ctx->Const.MaxDrawBuffers) {
          _mesa_error(ctx, GL_INVALID_VALUE, "%s(index=%u)",
@@ -1059,11 +1061,11 @@ _mesa_set_enablei(GLcontext *ctx, GLenum cap, GLuint index, GLboolean state)
       }
       break;
    default:
-      goto bad_cap_error;
+      goto invalid_enum_error;
    }
    return;
 
-bad_cap_error:
+invalid_enum_error:
     _mesa_error(ctx, GL_INVALID_ENUM, "%s(cap=%s)",
                 state ? "glEnablei" : "glDisablei",
                 _mesa_lookup_enum_by_nr(cap));
@@ -1113,15 +1115,13 @@ _mesa_IsEnabledIndexed( GLenum cap, GLuint index )
 #undef CHECK_EXTENSION
 #define CHECK_EXTENSION(EXTNAME)			\
    if (!ctx->Extensions.EXTNAME) {			\
-      _mesa_error(ctx, GL_INVALID_ENUM, "glIsEnabled");	\
-      return GL_FALSE;					\
+      goto invalid_enum_error;				\
    }
 
 #undef CHECK_EXTENSION2
 #define CHECK_EXTENSION2(EXT1, EXT2)				\
    if (!ctx->Extensions.EXT1 && !ctx->Extensions.EXT2) {	\
-      _mesa_error(ctx, GL_INVALID_ENUM, "glIsEnabled");		\
-      return GL_FALSE;						\
+      goto invalid_enum_error;					\
    }
 
 
@@ -1510,7 +1510,12 @@ _mesa_IsEnabled( GLenum cap )
 #endif
 
       default:
-         _mesa_error(ctx, GL_INVALID_ENUM, "glIsEnabled(0x%x)", (int) cap);
-	 return GL_FALSE;
+         goto invalid_enum_error;
    }
+
+   return GL_FALSE;
+
+invalid_enum_error:
+   _mesa_error(ctx, GL_INVALID_ENUM, "glIsEnabled(0x%x)", (int) cap);
+   return GL_FALSE;
 }
-- 
2.7.4