Hi all,
I have some difficulties getting atomic counter to work. The first gl call
glGenBuffers throws a segfault. I am wondering if this is related to OpenSG
stuff or something else.
Thank you for your time!
Here is my code:
.h
#ifndef COUNTER_H_INCLUDED
#define COUNTER_H_INCLUDED
class AtomicCounter {
private:
GLuint buffer;
public:
AtomicCounter();
void init();
void reset();
void fetch();
};
#endif // COUNTER_H_INCLUDED
.cpp
#include <GL/glew.h>
#include <GL/glext.h>
#define GL_ATOMIC_COUNTER_BUFFER 0x92C0
#include "counter.h"
#include <string.h>
AtomicCounter::AtomicCounter() {;}
void AtomicCounter::init() {
// declare and generate a buffer object name
glGenBuffers(1, &buffer); // <
--------------------------------------------- segfault!!!
// bind the buffer and define its initial storage capacity
glBindBuffer(GL_ATOMIC_COUNTER_BUFFER, buffer);
glBufferData(GL_ATOMIC_COUNTER_BUFFER, sizeof(GLuint) * 3, NULL,
GL_DYNAMIC_DRAW);
// unbind the buffer
glBindBuffer(GL_ATOMIC_COUNTER_BUFFER, 0);
}
void AtomicCounter::reset() {
// declare a pointer to hold the values in the buffer
GLuint *userCounters;
glBindBuffer(GL_ATOMIC_COUNTER_BUFFER, buffer);
// map the buffer, userCounters will point to the buffers data
userCounters = (GLuint*)glMapBufferRange(GL_ATOMIC_COUNTER_BUFFER, 0 ,
sizeof(GLuint) * 3,
GL_MAP_WRITE_BIT |
GL_MAP_INVALIDATE_BUFFER_BIT | GL_MAP_UNSYNCHRONIZED_BIT );
// set the memory to zeros, resetting the values in the buffer
memset(userCounters, 0, sizeof(GLuint) *3 );
// unmap the buffer
glUnmapBuffer(GL_ATOMIC_COUNTER_BUFFER);
}
void AtomicCounter::fetch() {
GLuint userCounters[3];
glBindBuffer(GL_ATOMIC_COUNTER_BUFFER, buffer);
glGetBufferSubData(GL_ATOMIC_COUNTER_BUFFER, 0, sizeof(GLuint) * 3,
userCounters);
glBindBuffer(GL_ATOMIC_COUNTER_BUFFER, 0);
/*redPixels = userCounters[0];
greenPixels = userCounters[1];
redPixels = userCounters[2];*/
}
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