| 0,0 → 1,96 |
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| Name |
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| MESA_copy_sub_buffer |
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| Name Strings |
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| GLX_MESA_copy_sub_buffer |
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| Contact |
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| Brian Paul (brian.paul 'at' tungstengraphics.com) |
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| Status |
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| Shipping since Mesa 2.6 in February, 1998. |
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| Version |
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| Last Modified Date: 12 January 2009 |
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| Number |
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| 215 |
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| Dependencies |
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| OpenGL 1.0 or later is required. |
| GLX 1.0 or later is required. |
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| Overview |
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| The glxCopySubBufferMESA() function copies a rectangular region |
| of the back color buffer to the front color buffer. This can be |
| used to quickly repaint 3D windows in response to expose events |
| when the back color buffer cannot be damaged by other windows. |
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| IP Status |
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| Open-source; freely implementable. |
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| Issues |
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| None. |
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| New Procedures and Functions |
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| void glXCopySubBufferMESA( Display *dpy, GLXDrawable drawable, |
| int x, int y, int width, int height ); |
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| New Tokens |
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| None. |
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| Additions to Chapter 3 of the GLX 1.3 Specification (Functions and Errors) |
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| Add to section 3.3.10 Double Buffering: |
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| The function |
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| void glXCopySubBufferMESA( Display *dpy, GLXDrawable drawable, |
| int x, int y, int width, int height ); |
| |
| may be used to copy a rectangular region of the back color buffer to |
| the front color buffer. This can be used to quickly repaint 3D windows |
| in response to expose events when the back color buffer cannot be |
| damaged by other windows. |
| |
| <x> and <y> indicates the lower-left corner of the region to copy and |
| <width> and <height> indicate the size in pixels. Coordinate (0,0) |
| corresponds to the lower-left pixel of the window, like glReadPixels. |
| |
| If dpy and drawable are the display and drawable for the calling |
| thread's current context, glXCopySubBufferMESA performs an |
| implicit glFlush before it returns. Subsequent OpenGL commands |
| may be issued immediately after calling glXCopySubBufferMESA, but |
| are not executed until the copy is completed. |
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| GLX Protocol |
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| None at this time. The extension is implemented in terms of ordinary |
| Xlib protocol inside of Mesa. |
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| Errors |
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| None. |
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| New State |
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| None. |
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| Revision History |
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| 12 January 2009 Ian Romanick - Added language about implicit flush |
| and command completion. |
| 8 June 2000 Brian Paul - initial specification |
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