moved static variables and functions that should not have stuck behind in fg_joystick...

[freeglut] / progs / demos / smooth_opengl3 / smooth_opengl3.c

diff --git a/progs/demos/smooth_opengl3/smooth_opengl3.c b/progs/demos/smooth_opengl3/smooth_opengl3.c
index d72cf65..93e708d 100755 (executable)
--- a/progs/demos/smooth_opengl3/smooth_opengl3.c
+++ b/progs/demos/smooth_opengl3/smooth_opengl3.c
@@ -98,68 +98,74 @@ typedef char ourGLchar;
 #define APIENTRY
 #endif
 
-typedef void (APIENTRY *PFNGLGENBUFFERSPROC) (GLsizei n, GLuint *buffers);
-PFNGLGENBUFFERSPROC gl_GenBuffers;
 
+#ifndef GL_ARB_vertex_array_object
+typedef void (APIENTRY *PFNGLGENVERTEXARRAYSPROC) (GLsizei n, GLuint *arrays);
+typedef void (APIENTRY *PFNGLBINDVERTEXARRAYPROC) (GLuint array);
+#endif
+#ifndef GL_VERSION_1_5
+typedef void (APIENTRY *PFNGLGENBUFFERSPROC) (GLsizei n, GLuint *buffers);
 typedef void (APIENTRY *PFNGLBINDBUFFERPROC) (GLenum target, GLuint buffer);
-PFNGLBINDBUFFERPROC gl_BindBuffer;
-
 typedef void (APIENTRY *PFNGLBUFFERDATAPROC) (GLenum target, ourGLsizeiptr size, const GLvoid *data, GLenum usage);
-PFNGLBUFFERDATAPROC gl_BufferData;
-
+#endif
+#ifndef GL_VERSION_2_0
 typedef GLuint (APIENTRY *PFNGLCREATESHADERPROC) (GLenum type);
-PFNGLCREATESHADERPROC gl_CreateShader;
-
 typedef void (APIENTRY *PFNGLSHADERSOURCEPROC) (GLuint shader, GLsizei count, const ourGLchar **string, const GLint *length);
-PFNGLSHADERSOURCEPROC gl_ShaderSource;
-
 typedef void (APIENTRY *PFNGLCOMPILESHADERPROC) (GLuint shader);
-PFNGLCOMPILESHADERPROC gl_CompileShader;
-
 typedef GLuint (APIENTRY *PFNGLCREATEPROGRAMPROC) (void);
-PFNGLCREATEPROGRAMPROC gl_CreateProgram;
-
 typedef void (APIENTRY *PFNGLATTACHSHADERPROC) (GLuint program, GLuint shader);
-PFNGLATTACHSHADERPROC gl_AttachShader;
-
 typedef void (APIENTRY *PFNGLLINKPROGRAMPROC) (GLuint program);
-PFNGLLINKPROGRAMPROC gl_LinkProgram;
-
 typedef void (APIENTRY *PFNGLUSEPROGRAMPROC) (GLuint program);
-PFNGLUSEPROGRAMPROC gl_UseProgram;
-
 typedef void (APIENTRY *PFNGLGETSHADERIVPROC) (GLuint shader, GLenum pname, GLint *params);
-PFNGLGETSHADERIVPROC gl_GetShaderiv;
-
 typedef void (APIENTRY *PFNGLGETSHADERINFOLOGPROC) (GLuint shader, GLsizei bufSize, GLsizei *length, ourGLchar *infoLog);
-PFNGLGETSHADERINFOLOGPROC gl_GetShaderInfoLog;
-
 typedef void (APIENTRY *PFNGLGETPROGRAMIVPROC) (GLenum target, GLenum pname, GLint *params);
-PFNGLGETPROGRAMIVPROC gl_GetProgramiv;
-
 typedef void (APIENTRY *PFNGLGETPROGRAMINFOLOGPROC) (GLuint program, GLsizei bufSize, GLsizei *length, ourGLchar *infoLog);
-PFNGLGETPROGRAMINFOLOGPROC gl_GetProgramInfoLog;
-
 typedef GLint (APIENTRY *PFNGLGETATTRIBLOCATIONPROC) (GLuint program, const ourGLchar *name);
-PFNGLGETATTRIBLOCATIONPROC gl_GetAttribLocation;
-
 typedef void (APIENTRY *PFNGLVERTEXATTRIBPOINTERPROC) (GLuint index, GLint size, GLenum type, GLboolean normalized, GLsizei stride, const GLvoid *pointer);
-PFNGLVERTEXATTRIBPOINTERPROC gl_VertexAttribPointer;
-
 typedef void (APIENTRY *PFNGLENABLEVERTEXATTRIBARRAYPROC) (GLuint index);
-PFNGLENABLEVERTEXATTRIBARRAYPROC gl_EnableVertexAttribArray;
-
 typedef GLint (APIENTRY *PFNGLGETUNIFORMLOCATIONPROC) (GLuint program, const ourGLchar *name);
-PFNGLGETUNIFORMLOCATIONPROC gl_GetUniformLocation;
-
 typedef void (APIENTRY *PFNGLUNIFORMMATRIX4FVPROC) (GLint location, GLsizei count, GLboolean transpose, const GLfloat *value);
+#endif
+
+PFNGLGENVERTEXARRAYSPROC gl_GenVertexArrays;
+PFNGLBINDVERTEXARRAYPROC gl_BindVertexArray;
+PFNGLGENBUFFERSPROC gl_GenBuffers;
+PFNGLBINDBUFFERPROC gl_BindBuffer;
+PFNGLBUFFERDATAPROC gl_BufferData;
+PFNGLCREATESHADERPROC gl_CreateShader;
+PFNGLSHADERSOURCEPROC gl_ShaderSource;
+PFNGLCOMPILESHADERPROC gl_CompileShader;
+PFNGLCREATEPROGRAMPROC gl_CreateProgram;
+PFNGLATTACHSHADERPROC gl_AttachShader;
+PFNGLLINKPROGRAMPROC gl_LinkProgram;
+PFNGLUSEPROGRAMPROC gl_UseProgram;
+PFNGLGETSHADERIVPROC gl_GetShaderiv;
+PFNGLGETSHADERINFOLOGPROC gl_GetShaderInfoLog;
+PFNGLGETPROGRAMIVPROC gl_GetProgramiv;
+PFNGLGETPROGRAMINFOLOGPROC gl_GetProgramInfoLog;
+PFNGLGETATTRIBLOCATIONPROC gl_GetAttribLocation;
+PFNGLVERTEXATTRIBPOINTERPROC gl_VertexAttribPointer;
+PFNGLENABLEVERTEXATTRIBARRAYPROC gl_EnableVertexAttribArray;
+PFNGLGETUNIFORMLOCATIONPROC gl_GetUniformLocation;
 PFNGLUNIFORMMATRIX4FVPROC gl_UniformMatrix4fv;
 
-void initExtensionEntries(void) 
+void initExtensionEntries(void)
 {
+   gl_GenVertexArrays = (PFNGLGENVERTEXARRAYSPROC) glutGetProcAddress ("glGenVertexArrays");
+   gl_BindVertexArray = (PFNGLBINDVERTEXARRAYPROC) glutGetProcAddress ("glBindVertexArray");
+   if (!gl_GenVertexArrays || !gl_BindVertexArray)
+   {
+       fprintf (stderr, "glGenVertexArrays or glBindVertexArray not found");
+       exit(1);
+   }
    gl_GenBuffers = (PFNGLGENBUFFERSPROC) glutGetProcAddress ("glGenBuffers");
    gl_BindBuffer = (PFNGLBINDBUFFERPROC) glutGetProcAddress ("glBindBuffer");
    gl_BufferData = (PFNGLBUFFERDATAPROC) glutGetProcAddress ("glBufferData");
+   if (!gl_GenBuffers || !gl_BindBuffer || !gl_BufferData)
+   {
+       fprintf (stderr, "glGenBuffers, glBindBuffer or glBufferData not found");
+       exit(1);
+   }
    gl_CreateShader = (PFNGLCREATESHADERPROC) glutGetProcAddress ("glCreateShader");
    gl_ShaderSource = (PFNGLSHADERSOURCEPROC) glutGetProcAddress ("glShaderSource");
    gl_CompileShader = (PFNGLCOMPILESHADERPROC) glutGetProcAddress ("glCompileShader");
@@ -176,6 +182,11 @@ void initExtensionEntries(void)
    gl_EnableVertexAttribArray = (PFNGLENABLEVERTEXATTRIBARRAYPROC) glutGetProcAddress ("glEnableVertexAttribArray");
    gl_GetUniformLocation = (PFNGLGETUNIFORMLOCATIONPROC) glutGetProcAddress ("glGetUniformLocation");
    gl_UniformMatrix4fv = (PFNGLUNIFORMMATRIX4FVPROC) glutGetProcAddress ("glUniformMatrix4fv");
+   if (!gl_CreateShader || !gl_ShaderSource || !gl_CompileShader || !gl_CreateProgram || !gl_AttachShader || !gl_LinkProgram || !gl_UseProgram || !gl_GetShaderiv || !gl_GetShaderInfoLog || !gl_GetProgramiv || !gl_GetProgramInfoLog || !gl_GetAttribLocation || !gl_VertexAttribPointer || !gl_EnableVertexAttribArray || !gl_GetUniformLocation || !gl_UniformMatrix4fv)
+   {
+       fprintf (stderr, "glCreateShader, glShaderSource, glCompileShader, glCreateProgram, glAttachShader, glLinkProgram, glUseProgram, glGetShaderiv, glGetShaderInfoLog, glGetProgramiv, glGetProgramInfoLog, glGetAttribLocation, glVertexAttribPointer, glEnableVertexAttribArray, glGetUniformLocation or glUniformMatrix4fv not found");
+       exit(1);
+   }
 }
 
 /* vertex array data for a colored 2D triangle, consisting of RGB color values
@@ -201,9 +212,17 @@ enum {
 
 /* the name of the vertex buffer object */
 GLuint vertexBufferName;
+GLuint vertexArrayName;
 
 void initBuffer(void)
 {
+   /* Need to setup a vertex array as otherwise invalid operation errors can
+    * occur when accessing vertex buffer (OpenGL 3.3 has no default zero named
+    * vertex array) 
+    */
+   gl_GenVertexArrays(1, &vertexArrayName);
+   gl_BindVertexArray(vertexArrayName);
+
    gl_GenBuffers (1, &vertexBufferName);
    gl_BindBuffer (GL_ARRAY_BUFFER, vertexBufferName);
    gl_BufferData (GL_ARRAY_BUFFER, sizeof(varray), varray, GL_STATIC_DRAW);
@@ -415,8 +434,12 @@ void keyboard(unsigned char key, int x, int y)
    }
 }
 
+void samplemenu(int menuID)\r
+{}
+
 int main(int argc, char** argv)
 {
+   int menuA;
    glutInit(&argc, argv);
    glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB);
    /* add command line argument "classic" for a pre-3.x context */
@@ -432,6 +455,15 @@ int main(int argc, char** argv)
    glutDisplayFunc(display); 
    glutReshapeFunc(reshape);
    glutKeyboardFunc (keyboard);
+
+   /* Add a menu. They have their own context and should thus work with forward compatible main windows too. */
+   menuA = glutCreateMenu(samplemenu);\r
+   glutAddMenuEntry("Sub menu A1 (01)",1);\r
+   glutAddMenuEntry("Sub menu A2 (02)",2);\r
+   glutAddMenuEntry("Sub menu A3 (03)",3);
+   glutSetMenu(menuA);\r
+   glutAttachMenu(GLUT_RIGHT_BUTTON);
+
    glutMainLoop();
    return 0;
 }