From e510996901c57f36f226d0eec3c929fb8b69b8e0 Mon Sep 17 00:00:00 2001
From: Matt Turner <mattst88@gmail.com>
Date: Sat, 23 Feb 2008 05:42:32 +0000
Subject: Use inline-asm only with gcc. Add fallback for other compilers

git-svn-id: svn://mattst88.com/svn/glpong3d/trunk@19 4dd1920e-271a-0410-bca0-81b404a81564
---
 Makefile   | 50 +++++++++++++++++++++++++-------------------------
 glpong3d.c | 19 ++++++++++++-------
 glpong3d.h |  2 +-
 3 files changed, 38 insertions(+), 33 deletions(-)

diff --git a/Makefile b/Makefile
index c95d7ef..eed7203 100644
--- a/Makefile
+++ b/Makefile
@@ -1,26 +1,26 @@
-CC=gcc
-STRIP=strip
-WARN=-Wall -W -ansi -pedantic
-CFLAGS=-Os -pipe -std=c99 ${WARN}
-LDFLAGS=-Wl,-O1,-s
-INCLUDES=`sdl-config --cflags`
-LIBRARIES=`sdl-config --libs` -lSDL_image -lSDL_net -lGL -lGLU -lGLC
-EXT=.exe
-
-EXE=glpong3d${EXT}
-
-OBJS=glpong3d.o # ball.o paddle.o
-	
-all: ${OBJS}
-	${CC} ${LDFLAGS} ${OBJS} -o ${EXE} ${LIBRARIES}
-
-clean:
-	rm -f ${OBJS}
-	rm -f ${EXE}
-
-rebuild: clean all
-remake: rebuild
-
-%.o: %.c
-	${CC} ${CFLAGS} ${INCLUDES} -c -o $@ $<
+CC=gcc
+STRIP=strip
+WARN=-Wall -W -ansi -pedantic
+CFLAGS=-g -Os -pipe -std=c99 ${WARN}
+LDFLAGS=-Wl,-O1,-s
+INCLUDES=`sdl-config --cflags`
+LIBRARIES=`sdl-config --libs` -lSDL_image -lSDL_net -lGL -lGLU -lGLC
+EXT=.exe
+
+EXE=glpong3d${EXT}
+
+OBJS=glpong3d.o # ball.o paddle.o
+	
+all: ${OBJS}
+	${CC} ${LDFLAGS} ${OBJS} -o ${EXE} ${LIBRARIES}
+
+clean:
+	rm -f ${OBJS}
+	rm -f ${EXE}
+
+rebuild: clean all
+remake: rebuild
+
+%.o: %.c
+	${CC} ${CFLAGS} ${INCLUDES} -c -o $@ $<
 	
diff --git a/glpong3d.c b/glpong3d.c
index a02a17f..c4739a8 100644
--- a/glpong3d.c
+++ b/glpong3d.c
@@ -451,18 +451,23 @@ void GLPong_CleanUp() {
 
 }
 
-__inline__ unsigned int NextPow2(unsigned int value) {   
+static __inline__ unsigned int
+NextPow2(unsigned int value) {   
+#if (defined __i386__ || defined __amd64__ || defined __x86_64__) \
+ && (defined __GNUC__)
 	unsigned int x;
-#ifdef __i386__
-	__asm("dec %1\n\t"
-		"movl $2,%0\n\t"
-		"bsr %1,%1\n\t"
-		"shl %b1,%0\n\t"
+	__asm(
+		"dec    %1      \n\t" /* so that if the number is a power of 
+                                       * two we don't change it
+                                       */
+		"movl   $2,%0   \n\t"
+		"bsr    %1,%1   \n\t"
+		"shl    %b1,%0  \n\t"
 		: "=r" (x)
 		: "c" (value)
 	);
 #else
-	x = 1;
+	unsigned int x = 0;
 	while (x < value) {
 		x *= 2;
 	}
diff --git a/glpong3d.h b/glpong3d.h
index b364f71..dafdee7 100644
--- a/glpong3d.h
+++ b/glpong3d.h
@@ -53,6 +53,6 @@ void GLPong_Move();
 void GLPong_Collide(Ball_t * ball, const Paddle_t * paddle);
 
 GLuint SDL_GL_SurfaceToTexture(SDL_Surface * surface);
-__inline__ unsigned int NextPow2(unsigned int value);
+static __inline__ unsigned int NextPow2(unsigned int value);
 
 #endif
-- 
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