Attachment 32454 Details for Bug 25898 – Code demonstrating the assert failure.

Code demonstrating the assert failure.

main.c (text/x-csrc), 2.34 KB, created by David on 2010-01-04 22:14:12 UTC

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Creator: David

Created: 2010-01-04 22:14:12 UTC

Size: 2.34 KB

patch

obsolete

>/* Compile with
> *      gcc main.c -lSDL -lGL
> *
> * Running with the two defines commented out causes the following failed assert:
> * a.out: vbo/vbo_save_api.c:503: _save_upgrade_vertex: Assertion `save->copied.nr == 0' failed.
> */
>
>#define WORK_PLEASE /* 1. Disable this define and nothing will be drawn. */
>#define DONT_CRASH  /* 2. Disable this define (along with 1) and the program will fail assert on display list compilation. */
>
>#include <SDL/SDL.h>
>#include <SDL/SDL_opengl.h>
>
>int main(int argc, char** argv)
>{
>    int ui, vi;
>    GLuint displayList;
>    SDL_Event event;
>
>    /* homogeneous points for the bicubic bezier patch */
>    float pts[16*4] = {-.5f,-.5f,0,1,  -.2f,-.5f,0,1,  .2f,-.5f,0,1,  .5f,-.5f,0,1,
>                       -.5f,-.2f,0,1,  -.2f,-.2f,0,1,  .2f,-.2f,0,1,  .5f,-.2f,0,1,
>                       -.5f, .2f,0,1,  -.2f, .2f,0,1,  .2f, .2f,0,1,  .5f, .2f,0,1,
>                       -.5f, .5f,0,1,  -.2f, .5f,0,1,  .2f, .5f,0,1,  .5f, .5f,0,1};
>                        
>    /* SDL init stuff */
>    SDL_Init(SDL_INIT_VIDEO);
>    atexit(SDL_Quit);
>    SDL_SetVideoMode(640,480, 0, SDL_OPENGL);
>
>    /* Enable vertex mapping */
>    glEnable(GL_MAP2_VERTEX_3);
>
>    /* Create the display list */
>    displayList = glGenLists(1);
>    glNewList(displayList, GL_COMPILE);
>        glMap2f(GL_MAP2_VERTEX_3,0,1,4,4,0,1,16,4,pts);
>        glMapGrid2f(10,0,1,10,1,0);
>#       ifdef WORK_PLEASE 
>            glEvalMesh2(GL_FILL,0,10,0,10);
>#       else /* if set to zero, nothing will be drawn */
>            for (vi = 0; vi < 10; ++vi) {
>                glBegin(GL_TRIANGLE_STRIP);
>#               ifndef DONT_CRASH
>                    glVertex3f(0,0,0); /* uncomment this line to fail the assert */
>#               endif
>                for (ui = 0; ui < 11; ++ui) {
>                    glEvalPoint2(ui,vi+1);
>                    glEvalPoint2(ui,vi);
>                }
>                glEnd();
>            }
>#       endif
>    glEndList();
>
>    /* won't even make it to here if WORK_PLEASE and DONT_CRASH are not defined */
>
>    while (1) {
>        /* allow us to quit cleanly */
>        while (SDL_PollEvent(&event)) {
>            if (event.type == SDL_QUIT)
>                 return 0;
>        }
>
>        /* Render! */
>        glClear(GL_COLOR_BUFFER_BIT);
>        glCallList(displayList);
>
>        /* Finish */
>        SDL_GL_SwapBuffers();
>        SDL_Delay(15);
>    }
>}

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