progs/egl: Fix building on cygwin.

Update the Makefiles to use variables such as EGL_LIB_NAME.  Define M_PI
if it hasn't been defined yet.

configure.ac

@@ -265,7 +265,7 @@ else
     darwin* )
         LIB_EXTENSION='dylib' ;;
     cygwin* )
-        LIB_EXTENSION='dll' ;;
+        LIB_EXTENSION='dll.a' ;;
     aix* )
         LIB_EXTENSION='a' ;;
     * )

progs/egl/opengl/Makefile

@@ -7,9 +7,9 @@ include $(TOP)/configs/current
 INCLUDE_DIRS = -I$(TOP)/include $(X11_CFLAGS)
 
 HEADERS = $(TOP)/include/GLES/egl.h
-LIB_DEP = $(TOP)/$(LIB_DIR)/libEGL.so
+LIB_DEP = $(TOP)/$(LIB_DIR)/$(EGL_LIB_NAME)
 
-LIBS = -L$(TOP)/$(LIB_DIR) -lEGL -lGL -lm
+LIBS = -L$(TOP)/$(LIB_DIR) -l$(EGL_LIB) -l$(GL_LIB) -lm
 
 EGLUT_DIR = $(TOP)/progs/egl/eglut
 

progs/egl/opengl/eglgears.c

@@ -33,6 +33,10 @@
 
 #include "eglut.h"
 
+#ifndef M_PI
+#define M_PI 3.14159265
+#endif
+
 static GLfloat view_rotx = 20.0, view_roty = 30.0, view_rotz = 0.0;
 static GLint gear1, gear2, gear3;
 static GLfloat angle = 0.0;

progs/egl/opengles1/Makefile

@@ -12,13 +12,13 @@ HEADERS = $(TOP)/include/GLES/egl.h
 
 
 ES1_LIB_DEPS = \
-	$(TOP)/$(LIB_DIR)/libEGL.so \
-	$(TOP)/$(LIB_DIR)/libGLESv1_CM.so
+	$(TOP)/$(LIB_DIR)/$(EGL_LIB_NAME) \
+	$(TOP)/$(LIB_DIR)/$(GLESv1_CM_LIB_NAME)
 
 
 ES1_LIBS = \
-	-L$(TOP)/$(LIB_DIR) -lEGL \
-	-L$(TOP)/$(LIB_DIR) -lGLESv1_CM $(LIBDRM_LIB) $(X11_LIBS)
+	-L$(TOP)/$(LIB_DIR) -l$(EGL_LIB) -l$(GLESv1_CM_LIB) \
+	$(LIBDRM_LIB) $(X11_LIBS)
 
 EGLUT_DIR = $(TOP)/progs/egl/eglut
 

progs/egl/opengles1/pbuffer.c

@@ -22,6 +22,9 @@
 #include <EGL/egl.h>
 
 
+#ifndef M_PI
+#define M_PI 3.14159265
+#endif
 
 static int WinWidth = 300, WinHeight = 300;
 

progs/egl/opengles1/render_tex.c

@@ -22,6 +22,10 @@
 #include <EGL/egl.h>
 
 
+#ifndef M_PI
+#define M_PI 3.14159265
+#endif
+
 static int TexWidth = 256, TexHeight = 256;
 
 static int WinWidth = 300, WinHeight = 300;

progs/egl/opengles1/torus.c

@@ -17,6 +17,10 @@
 
 #include "eglut.h"
 
+#ifndef M_PI
+#define M_PI 3.14159265
+#endif
+
 static const struct {
    GLenum internalFormat;
    const char *name;

progs/egl/opengles2/Makefile

@@ -14,13 +14,13 @@ HEADERS = $(TOP)/include/GLES/egl.h
 
 
 ES2_LIB_DEPS = \
-	$(TOP)/$(LIB_DIR)/libEGL.so \
-	$(TOP)/$(LIB_DIR)/libGLESv2.so
+	$(TOP)/$(LIB_DIR)/$(EGL_LIB_NAME) \
+	$(TOP)/$(LIB_DIR)/$(GLESv2_LIB_NAME)
 
 
 ES2_LIBS = \
-	-L$(TOP)/$(LIB_DIR) -lEGL \
-	-L$(TOP)/$(LIB_DIR) -lGLESv2 $(LIBDRM_LIB) $(X11_LIBS) \
+	-L$(TOP)/$(LIB_DIR) -l$(EGL_LIB) -l$(GLESv2_LIB) \
+	$(LIBDRM_LIB) $(X11_LIBS)
 
 PROGRAMS = \
 	es2_info \

progs/egl/opengles2/es2gears.c

@@ -46,6 +46,10 @@
 #include <EGL/eglext.h>
 #include "eglut.h"
 
+#ifndef M_PI
+#define M_PI 3.14159265
+#endif
+
 struct gear {
    GLfloat *vertices;
    GLuint vbo;

progs/egl/opengles2/tri.c

@@ -29,6 +29,10 @@
 #include <EGL/egl.h>
 
 
+#ifndef M_PI
+#define M_PI 3.14159265
+#endif
+
 #define FLOAT_TO_FIXED(X)   ((X) * 65535.0)
 
 

progs/egl/openvg/Makefile

@@ -3,7 +3,7 @@
 TOP = ../../..
 include $(TOP)/configs/current
 
-VG_LIBS=-lm -lEGL -lOpenVG -L$(TOP)/lib -L$(TOP)/lib/gallium
+VG_LIBS=-lm -L$(TOP)/$(LIB_DIR) -l$(EGL_LIB) -l$(VG_LIB)
 INCLUDE_DIRS = -I$(TOP)/include $(X11_CFLAGS)
 
 EGLUT_DIR = $(TOP)/progs/egl/eglut