freeglut_display.c
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上传日期:2022-01-07
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- /*
- * freeglut_display.c
- *
- * Display message posting, context buffer swapping.
- *
- * Copyright (c) 1999-2000 Pawel W. Olszta. All Rights Reserved.
- * Written by Pawel W. Olszta, <olszta@sourceforge.net>
- * Creation date: Fri Dec 3 1999
- *
- * Permission is hereby granted, free of charge, to any person obtaining a
- * copy of this software and associated documentation files (the "Software"),
- * to deal in the Software without restriction, including without limitation
- * the rights to use, copy, modify, merge, publish, distribute, sublicense,
- * and/or sell copies of the Software, and to permit persons to whom the
- * Software is furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included
- * in all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
- * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
- * PAWEL W. OLSZTA BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
- * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
- * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
- */
- #include <GL/freeglut.h>
- #include "freeglut_internal.h"
- /* -- INTERFACE FUNCTIONS -------------------------------------------------- */
- /*
- * Marks the current window to have the redisplay performed when possible...
- */
- void FGAPIENTRY glutPostRedisplay( void )
- {
- FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutPostRedisplay" );
- FREEGLUT_EXIT_IF_NO_WINDOW ( "glutPostRedisplay" );
- fgStructure.CurrentWindow->State.Redisplay = GL_TRUE;
- }
- /*
- * Swaps the buffers for the current window (if any)
- */
- void FGAPIENTRY glutSwapBuffers( void )
- {
- FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutSwapBuffers" );
- FREEGLUT_EXIT_IF_NO_WINDOW ( "glutSwapBuffers" );
- /*
- * "glXSwapBuffers" already performs an implicit call to "glFlush". What
- * about "SwapBuffers"?
- */
- glFlush( );
- if( ! fgStructure.CurrentWindow->Window.DoubleBuffered )
- return;
- #if TARGET_HOST_POSIX_X11
- glXSwapBuffers( fgDisplay.Display, fgStructure.CurrentWindow->Window.Handle );
- #elif TARGET_HOST_MS_WINDOWS
- SwapBuffers( fgStructure.CurrentWindow->Window.Device );
- #endif
- /* GLUT_FPS env var support */
- if( fgState.FPSInterval )
- {
- GLint t = glutGet( GLUT_ELAPSED_TIME );
- fgState.SwapCount++;
- if( fgState.SwapTime == 0 )
- fgState.SwapTime = t;
- else if( t - fgState.SwapTime > fgState.FPSInterval )
- {
- float time = 0.001f * ( t - fgState.SwapTime );
- float fps = ( float )fgState.SwapCount / time;
- fprintf( stderr,
- "freeglut: %d frames in %.2f seconds = %.2f FPSn",
- fgState.SwapCount, time, fps );
- fgState.SwapTime = t;
- fgState.SwapCount = 0;
- }
- }
- }
- /*
- * Mark appropriate window to be displayed
- */
- void FGAPIENTRY glutPostWindowRedisplay( int windowID )
- {
- SFG_Window* window;
- FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutPostWindowRedisplay" );
- window = fgWindowByID( windowID );
- freeglut_return_if_fail( window );
- window->State.Redisplay = GL_TRUE;
- }
- /*** END OF FILE ***/