Locking a VBO in OpenGL

[chronozphere]

Hmm... you should try and set a breakpoint somewhere. Step through your code and pinpoint the exact location of the bug.

I could help you fix this, but i need you to get Online (MSN). :razz:

[User137]

Still the same. I even tried glDrawArrays instead, but I still get that god-damn AV. :?

Could you paste your array declaration and code where pointers (both vertex and index buffers) are set to VBO.

[Brainer]

I could help you fix this, but i need you to get Online (MSN). :razz:

I'm online all the time, but I'm using an offline mode.

User137, I'm not sure what you mean, I'm posting this:
[pascal]
{ TBVertexBufforOGL }

{ .: BUsageToOGLUsage :. }
function BUsageToOGLUsage(const Usage: TBUsage): GLuint; inline;
begin
case Usage of
BUSAGE_RENDERTARGET: Result := GL_STATIC_DRAW_ARB;
BUSAGE_DYNAMIC: Result := GL_DYNAMIC_DRAW_ARB;
BUSAGE_WRITEONLY: Result := GL_WRITE_ONLY_ARB;
end;
end;

procedure TBVertexBufforOGL.CreateVertexBuffor(Size, SizeVertex: Integer;
FVF: DWORD; Pool: TBPOOL; Usage: TBUsage);
begin
glGenBuffersARB(1, @VBuffor);

glBindBufferARB(GL_ARRAY_BUFFER_ARB, VBuffor);
glBufferDataARB(GL_ARRAY_BUFFER_ARB, Size * SizeVertex, nil,
BUsageToOGLUsage(Usage));

FSizeVertex := SizeVertex;
end;

destructor TBVertexBufforOGL.Destroy;
begin
UnInit();

inherited Destroy();
end;

function BUFFER_OFFSET(I: Cardinal): Pointer;
var
Ptr: Pointer absolute I;
begin
Result := Ptr;
end;

function TBVertexBufforOGL.Lock(Start, Count: DWORD): Pointer;
begin
Result := glMapBufferARB(GL_ARRAY_BUFFER_ARB, GL_READ_ONLY_ARB);
end;

procedure TBVertexBufforOGL.Render(Typ: TBShapetype; Count: DWORD);
var
TheType: GLuint;
begin
glEnableClientState(GL_VERTEX_ARRAY);
glBindBufferARB(GL_ARRAY_BUFFER_ARB, VBuffor);
case Typ of
BPOINTLIST: TheType := GL_POINTS;
BLINELIST: TheType := GL_LINES;
BLINESTRIP: TheType := GL_LINE_STRIP;
BTRIANGLELIST: TheType := GL_TRIANGLES;
BTRIANGLESTRIP: TheType := GL_TRIANGLE_STRIP;
BTRIANGLEFAN: TheType := GL_TRIANGLE_FAN;
end;
glDrawArrays(TheType, 0, Count);
glDisableClientState(GL_VERTEX_ARRAY);
end;

procedure TBVertexBufforOGL.UnInit;
begin
glDeleteBuffersARB(1, @VBuffor);
end;

procedure TBVertexBufforOGL.UnLock;
begin
glUnmapBufferARB(GL_ARRAY_BUFFER_ARB);
end;
[/pascal]