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Page 396 OpenGL Super Bible! glCallList(THREAD_LIST); // End this display listglEndList(); See Also glCallList, glCallLists, glDeleteLists, glGenLists, glIsList
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OpenGL Super Bible! Page 395 glNewList Purpose Begins the creation or replacement of a display list. Include File Syntax void glNewList(GLuint list, GLenum mode); Description A display list is a group of OpenGL commands that are stored for execution on command. You can use display lists to speed up drawings that are computationally intensive or that require data to be read from a disk. The glNewList function begins a display list with an identifier specified by the integer list parameter. The display list identifier is used by glCallList and glCallLists to refer to the display list. If it s not unique, a previous display list may be overwritten. You can use glGenLists to reserve a range of display list names, and glIsList to test a display list identifier before using it. Display lists can be compiled only, or compiled and executed. After glNewList is called, all OpenGL commands are stored in the display list in the order they were issued until glEndList is called. The following commands are executed when called and are never stored in the display list itself: glIsList, glGenLists, glDeleteLists, glFeedbackBuffer, glSelectBuffer, glRenderMode, glReadPixels, glPixelStore, glFlush, glFinish, glIsEnabled, and glGet. Parameters list GLuint: The numerical name of the display list. If the display list already exists, it is replaced by the new display list. mode GLenum: Display lists may be compiled and executed later, or compiled and executed simultaneously. Specify GL_COMPILE to only compile the display list, or GL_COMPILE_AND_EXECUTE to execute the display list as it is being compiled. Returns None. Example The following is an example of a display list being delimited by glNewList and glEndList. This particular display list is composed by nesting two other display lists within it. // Begin delimit of list glNewList(BOLT_LIST,GL_COMPILE); // Display list calls two previously defined display lists glCallList(SHAFT_LIST);
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Page 394 OpenGL Super Bible! glEndList(); // And so on // Call first ten lists glCallLists(10,GL_INT,listA); // Call next ten lists, using the same array glListBase(10); glCallIsts(10,GL_INT,listA); See Also glCallLists
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OpenGL Super Bible! Page 393 glListBase Purpose Specifies an offset to be added to the list values specified in a call to glCallLists. Include File Syntax void glListBase(GLuint base ); Description The function glCallLists calls a series of display lists listed in an array. This function sets an offset value that can be added to each display list name for this function. By default this is zero. You can retrieve the current value by calling glGet(GL_LIST_BASE). Parameters base GLuint: Sets an integer offset value that will be added to display list names specified in calls to glCallLists. This value is zero by default. Returns None. Example The following code fragment creates 20 display lists numbered 0 through 19. An array of display list names (listA) is created that contains the numbers 0 through 9. Then glCallLists is used to execute all the display lists named in the listA array. Then, rather than reload the array with the next 10 display lists names, an offset value is specified with a call to glListBase. When glCallLists is called using the listA array, each element in listA will be offset by the value specified (10). int listA[10]; int i; for(i = 0; i < 10; i++) listA[i] = i; // Build display Lists 1 - 20 glNewList(1,GL_COMPILE); glEndList(); // Second list glNewList(2,GL_COMPILE);
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Page 392 OpenGL Super Bible! glIsList Purpose Tests for the existence of a display list. Include File Syntax GLboolean glIsList(GLuint list ); Description This function is used to find out if a display list exists for a given identifier. You can use this function to test display list values before using them. Parameters list GLuint: The value of a potential display list. This function tests this value to see if a display list is defined for it. Returns GL_TRUE if the display list exists, otherwise GL_FALSE. Example The following code loops through an array that should contain valid display lists. The display list identifier is tested for validity, and if valid it is called int lists[25]; // Array of display lists int x; // Looping variable for(x = 0; x < 25; x++) if(glIsList(lists[x]) glCallList(); See Also glCallList, glCallLists, glDeleteLists, glGenLists, glNewList
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OpenGL Super Bible! Page 391 glGenLists Purpose Generates a continuous range of empty display lists. Include File Syntax GLuint glGenLists(GLsizei range); Description This function creates a range of empty display lists. The number of lists generated depends on the value specified in range. The return value is then the first display list in this range of empty display lists. The purpose of this function is to reserve a range of display list values for future use. Parameters range GLsizei: The number of empty display lists requested. Returns The first display list of the range requested. The display list values following the return value up to range -1 are created empty. Example The following code allocates an array of 25 integers that will be used to store 25 display lists. Each element in the array must be assigned a valid display list name that can be used later. int lists[25]; // Space for 25 display lists int first; // Index of the first display list name available int x; // Looping variable // Get the first display list identifier first = glGenLists(25); // Loop and assign each element in the array with a valid display list for(x = 0; x < 25; x++) lists[25] = first + x + 1; See Also glCallList, glCallLists, glDeleteLists, glNewList
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Page 390 OpenGL Super Bible! glEndList Purpose Delimits the end of a display list. Include File Syntax void glEndList( void); Description Display lists are created by first calling glNewList. Thereafter, all OpenGL commands are compiled and placed in the display list. The glEndList function terminates the creation of this display list. Returns None. Example The following example code shows an example of a display list being delimited by glNewList and glEndList. This particular display list is composed by nesting two other display lists within it. // Begin delimit of list glNewList(BOLT_LIST,GL_COMPILE); // Display list calls two previously defined display lists glCallList(SHAFT_LIST); glCallList(THREAD_LIST); // End this display list glEndList(); See Also glCallList, glCallLists, glDeleteLists, glGenLists, glIsList
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OpenGL Super Bible! Page 389 glDeleteLists Purpose Deletes a continuous range of display lists. Include File Syntax void glDeleteLists(GLuint list, GLsizei range); Description This function deletes a range of display lists. The range goes from an initial value and proceeds until the number of lists deleted as specified by range is completed. Deleting unused display lists can save considerable memory. Unused display lists in the range of those specified are ignored and do not cause an error. Parameters list GLuint: The integer name of the first display list to delete. range GLsizei: The number of display lists to be deleted following the initially specified list. Returns None. Example The following single line of code shows any and all display lists with identifiers between 1 and 50 being deleted: glDeleteLists(1, 50); See Also glCallList, glCallLists, glGenLists, glIsList, glNewList
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Page 388 OpenGL Super Bible! glEndList(); // Second list glNewList(lists[1],GL_COMPILE); glEndList(); // And so on // Call all fifty lists with a single call glCallLists(50, GL_INT, lists); See Also glCallList, glDeleteLists, glGenLists, glListBase, glNewList
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OpenGL Super Bible! Page 387 glCallLists Purpose Executes a list of display lists. Include File Syntax void glCallLists(GLsizei n, GLenum type, const GLvoid *lists); Description This function calls the display lists listed in the *lists array sequentially. This array can be of nearly any data type. The result is converted or clamped to the nearest integer value to determine the actual index of the display list. Optionally, the list values can be offset by a value specified by the function glListBase. Parameters n GLsizei: Number of elements in the array of display lists. type GLenum: Specifies the datatype of the array stored at *lists. This can be any one of the following values: GL_BYTE, GL_UNSIGNED_BYTE, GL_SHORT, GL_UNSIGNED_SHORT, GL_INT, GL_UNSIGNED_INT, GL_FLOAT, GL_2_BYTES, GL_3_BYTES, and GL_4_BYTES. *lists GLvoid: An array of elements of the type specified in type. The data type is void to allow any of the above data types to be used. Returns None. Example The following code shows how to call a list of display lists with a single call: // Storage for the display list identifiers int lists[50]; int i; // Create list names for(i = 0; i < 50; i++) lists[i] = i+1; // Build some fifty display lists ////////// // First list glNewList(lists[0],GL_COMPILE);
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