OpenGL-es 2.0代碼中的內存錯誤

Question

我已經在Ubuntu 10.10中用PVRSDK在OpenGL-ES 2.0中編寫了一個代碼，現在的事情是，無論我想要什麼輸出，我都會得到它，但它來了，然後窗口消失， 如果我把一個斷點，我得到我想要的。但我不明白窗戶爲什麼消失。

當我做Valgrind的內存檢查我得到了這些錯誤：

==5997== Memcheck, a memory error detector 
==5997== Copyright (C) 2002-2010, and GNU GPL'd, by Julian Seward et al. 
==5997== Using Valgrind-3.6.0.SVN-Debian and LibVEX; rerun with -h for copyright info 
==5997== Command: ./cube 
==5997== 
libEGL warning: use software fallback 
==5997== 
==5997== HEAP SUMMARY: 
==5997==  in use at exit: 12,126 bytes in 94 blocks 
==5997== total heap usage: 97,499 allocs, 97,405 frees, 197,353,970 bytes allocated 
==5997== 
==5997== 8 bytes in 1 blocks are definitely lost in loss record 3 of 57 
==5997== at 0x4024F12: calloc (vg_replace_malloc.c:467) 
==5997== by 0x486CE90: __glXInitialize (glxinit.c:584) 
==5997== by 0x486AA61: x11_screen_support (x11_screen.c:133) 
==5997== by 0x486DEEB: x11_create_dri2_display (native_dri2.c:700) 
==5997== by 0x4869AEA: native_create_display (native_x11.c:42) 
==5997== by 0x4866A2A: egl_g3d_initialize (egl_g3d.c:498) 
==5997== by 0x4176F36: _eglMatchDriver (egldriver.c:580) 
==5997== by 0x4170BBF: eglInitialize (eglapi.c:294) 
==5997== by 0x8049EFF: main (Hello.cpp:231) 
==5997== 
==5997== 40 bytes in 1 blocks are definitely lost in loss record 31 of 57 
==5997== at 0x4026351: operator new(unsigned int) (vg_replace_malloc.c:255) 
==5997== by 0x8049CE3: main (Hello.cpp:206) 
==5997== 
==5997== 72 bytes in 1 blocks are definitely lost in loss record 34 of 57 
==5997== at 0x4024F12: calloc (vg_replace_malloc.c:467) 
==5997== by 0x4A50C7C: st_bufferobj_alloc (st_cb_bufferobjects.c:56) 
==5997== by 0x49A1B78: _mesa_alloc_shared_state (shared.c:94) 
==5997== by 0x498860F: _mesa_initialize_context_for_api (context.c:904) 
==5997== by 0x49886DB: _mesa_create_context_for_api (context.c:1050) 
==5997== by 0x49C7479: st_create_context (st_context.c:176) 
==5997== by 0x4985A80: st_api_create_context (st_manager.c:646) 
==5997== by 0x4868843: egl_g3d_create_context (egl_g3d_api.c:131) 
==5997== by 0x4173127: eglCreateContext (eglapi.c:413) 
==5997== by 0x804A039: main (Hello.cpp:261) 
==5997== 
==5997== 1,546 (48 direct, 1,498 indirect) bytes in 1 blocks are definitely lost in loss record 55 of 57 
==5997== at 0x4025BD3: malloc (vg_replace_malloc.c:236) 
==5997== by 0x4BABD13: talloc_enable_null_tracking (in /usr/lib/libtalloc.so.2.0.1) 
==5997== by 0x4BABE28: talloc_init (in /usr/lib/libtalloc.so.2.0.1) 
==5997== by 0x49F48B5: glsl_symbol_table::glsl_symbol_table() (glsl_symbol_table.cpp:60) 
==5997== by 0x49F2566: _mesa_glsl_parse_state::_mesa_glsl_parse_state(__GLcontextRec*, unsigned int, void*) (glsl_parser_extras.cpp:50) 
==5997== by 0x49D68B3: _mesa_glsl_compile_shader (ir_to_mesa.cpp:2815) 
==5997== by 0x49A0486: _mesa_CompileShaderARB (shaderapi.c:807) 
==5997== by 0x804A0E1: main (Hello.cpp:280) 
==5997== 
==5997== LEAK SUMMARY: 
==5997== definitely lost: 168 bytes in 4 blocks 
==5997== indirectly lost: 1,498 bytes in 28 blocks 
==5997==  possibly lost: 0 bytes in 0 blocks 
==5997== still reachable: 10,460 bytes in 62 blocks 
==5997==   suppressed: 0 bytes in 0 blocks 
==5997== Reachable blocks (those to which a pointer was found) are not shown. 
==5997== To see them, rerun with: --leak-check=full --show-reachable=yes 
==5997== 
==5997== For counts of detected and suppressed errors, rerun with: -v 
==5997== ERROR SUMMARY: 4 errors from 4 contexts (suppressed: 54 from 11) 

現在那些他們提線：

206   x11Visual = new XVisualInfo; 
207   XMatchVisualInfo(x11Display, x11Screen, i32Depth, TrueColor, x11Vis ual); 
208   if (!x11Visual) 
209   { 
210     printf("Error: Unable to acquire visual\n"); 
211     goto cleanup; 
212   } 

=========================================================================================== 

230   EGLint iMajorVersion, iMinorVersion; 
231   if (!eglInitialize(eglDisplay, &iMajorVersion, &iMinorVersion)) 
232   { 
233     printf("Error: eglInitialize() failed.\n"); 
234   } 

========================================================================================== 

eglContext = eglCreateContext(eglDisplay, eglConfig, NULL, ai32Conte xtAttribs); 
262   if (!TestEGLError("eglCreateContext")) 
263   { 
264     goto cleanup; 
265   } 

============================================================================================ 

279   glShaderSource(uiFragShader, 1, (const char**)&pszFragShader, NULL); 
280   glCompileShader(uiFragShader); 

所以我只是想知道，因爲它的這些錯誤我得到的屏幕消失或其他可能是其他原因。

Answer 1

我只是想知道，因爲這些錯誤的我得到的是屏幕上消失或別的東西。可能是因爲

後者。泄漏不會影響程序運行時間（除非它們太大以至於程序在需要時無法分配更多內存;但泄漏很小）。

你忘了進入X事件循環嗎？

更新：

int i32NumMessages = XPending(x11Display); 
for(int i = 0; i < i32NumMessages; i++) 
{ 
    XEvent event; 
    XNextEvent(x11Display, &event); 
} 

這個循環其實

• 明顯錯誤
• 的原因，你的應用程序（幾乎）立即退出

您目前只處理排隊的事件（可能只有很少的事件）。而你實際上是放棄它們。您可能需要編寫類似this的內容。