problem with glwidget and VBO.

[Rufjan]

Hi, I have a strange problem with glwidget and Vertex Buffer Object. Here is my simple code:

obj struct (a part of):

float *vertexy;
GLuint vertex_buf;
float *normalne;
GLuint norm_buf;
float *textury;
GLuint tex_buf;

float *vertexy;
GLuint vertex_buf;
float *normalne;
GLuint norm_buf;
float *textury;
GLuint tex_buf;

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t_obj.rozmiar is a size of 3d object (no. of polys)

Loading VBO :

glEnableClientState(GL_VERTEX_ARRAY);
 glGenBuffersARB(1, &t_obj.vertex_buf);
glBindBufferARB(GL_ARRAY_BUFFER_ARB, t_obj.vertex_buf);
glBufferDataARB(GL_ARRAY_BUFFER_ARB, (t_obj.rozmiar*3*3)*sizeof(float),t_obj.vertexy, GL_STATIC_DRAW_ARB); 
 
glEnableClientState(GL_NORMAL_ARRAY);
glGenBuffersARB(1, &t_obj.norm_buf);
glBindBufferARB(GL_ARRAY_BUFFER, t_obj.norm_buf);
glBufferDataARB(GL_ARRAY_BUFFER_ARB, (t_obj.rozmiar*3*3)*sizeof(float),t_obj.normalne, GL_STATIC_DRAW_ARB); 
 
glEnableClientState(GL_TEXTURE_COORD_ARRAY);
glGenBuffersARB(1, &t_obj.tex_buf);
glBindBufferARB(GL_ARRAY_BUFFER, t_obj.tex_buf);
glBufferDataARB(GL_ARRAY_BUFFER, (t_obj.rozmiar*3*3)*sizeof(float), t_obj.textury, GL_STATIC_DRAW_ARB);

glEnableClientState(GL_VERTEX_ARRAY);
 glGenBuffersARB(1, &t_obj.vertex_buf);
glBindBufferARB(GL_ARRAY_BUFFER_ARB, t_obj.vertex_buf);
glBufferDataARB(GL_ARRAY_BUFFER_ARB, (t_obj.rozmiar*3*3)*sizeof(float),t_obj.vertexy, GL_STATIC_DRAW_ARB); 
		
glEnableClientState(GL_NORMAL_ARRAY);
glGenBuffersARB(1, &t_obj.norm_buf);
glBindBufferARB(GL_ARRAY_BUFFER, t_obj.norm_buf);
glBufferDataARB(GL_ARRAY_BUFFER_ARB, (t_obj.rozmiar*3*3)*sizeof(float),t_obj.normalne, GL_STATIC_DRAW_ARB); 

glEnableClientState(GL_TEXTURE_COORD_ARRAY);
glGenBuffersARB(1, &t_obj.tex_buf);
glBindBufferARB(GL_ARRAY_BUFFER, t_obj.tex_buf);
glBufferDataARB(GL_ARRAY_BUFFER, (t_obj.rozmiar*3*3)*sizeof(float), t_obj.textury, GL_STATIC_DRAW_ARB);

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and drawing :

glEnableClientState(GL_VERTEX_ARRAY); 
 
glBindBufferARB( GL_ARRAY_BUFFER_ARB, obj.vertex_buf ); 
glVertexPointer( 3, GL_FLOAT, 0, (char *) NULL );  
 
glEnableClientState(GL_NORMAL_ARRAY); 
glBindBufferARB(GL_ARRAY_BUFFER, obj.norm_buf);
glNormalPointer(GL_FLOAT,0, (char *) NULL );  
 
glEnableClientState(GL_TEXTURE_COORD_ARRAY); 
glBindBufferARB(GL_ARRAY_BUFFER, obj.tex_buf);
glTexCoordPointer(3, GL_FLOAT, 0, (char *) NULL );
 
glDrawArrays(GL_TRIANGLES, 0, obj.rozmiar*3);
 
glDisableClientState( GL_VERTEX_ARRAY );

glEnableClientState(GL_VERTEX_ARRAY); 

glBindBufferARB( GL_ARRAY_BUFFER_ARB, obj.vertex_buf ); 
glVertexPointer( 3, GL_FLOAT, 0, (char *) NULL );  

glEnableClientState(GL_NORMAL_ARRAY); 
glBindBufferARB(GL_ARRAY_BUFFER, obj.norm_buf);
glNormalPointer(GL_FLOAT,0, (char *) NULL );  

glEnableClientState(GL_TEXTURE_COORD_ARRAY); 
glBindBufferARB(GL_ARRAY_BUFFER, obj.tex_buf);
glTexCoordPointer(3, GL_FLOAT, 0, (char *) NULL );
		 
glDrawArrays(GL_TRIANGLES, 0, obj.rozmiar*3);

glDisableClientState( GL_VERTEX_ARRAY );

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This code works perfect in "normal" opengl application (without QT). With QT and glwidget i have a clear screen. What am I Doing Wrong?

Rufjan

[lural]

Hi,

I have the same problem with a segmentation fault on the glDrawArrays(). How can test if my BufferDataARB is empty please ?

Thank's for your attention and sorry for my english.
Bye

[saman_artorious]

DO NOT use BufferDataARB() functions. These function are obsoleted.