glVertexAttribPointer hangup my computer

OpenGL OpenGL: Basic Coding
1

I tried to use glVertexAttribPointer to send array of tangent data to shader but it hangup my computer (The screen go black and wont recovery,I have to reboot it).

So I rewrite my code using old glBegin()/glEnd() and
glVertexAttrib3fv() and it work fine.

this is the code that dont work.

 

	bumpShader.activateShader();

	glDisable(GL_BLEND);

	glEnableClientState(GL_VERTEX_ARRAY);
	glEnableClientState(GL_NORMAL_ARRAY);

	glBindBufferARB(GL_ARRAY_BUFFER,vertexBufferID);
	glVertexPointer(3,GL_FLOAT,0,0);

	glBindBufferARB(GL_ARRAY_BUFFER,normalBufferID);
	glNormalPointer(GL_FLOAT,0,0);

	glVertexAttribPointer(bumpShader.tangentLoc,3,GL_FLOAT,GL_FALSE,0,&tangentArray[0]);

	glEnableVertexAttribArray(bumpShader.tangentLoc);


	for(int i=0;i<sceneGroupList.size();i++){
	
		 	if(this->enableMaterial == true){
				glMaterialfv( GL_FRONT, GL_AMBIENT, sceneGroupList[i].ambient );
				glMaterialfv( GL_FRONT, GL_DIFFUSE, sceneGroupList[i].diffuse );
				glMaterialfv( GL_FRONT, GL_SPECULAR, sceneGroupList[i].specular );
				glMaterialfv( GL_FRONT, GL_EMISSION, sceneGroupList[i].emissive );
				glMaterialf( GL_FRONT, GL_SHININESS, sceneGroupList[i].shininess );
			}
		
		  if(sceneGroupList[i].useTexture){
           
     		glActiveTexture(GL_TEXTURE0);
			glEnable(GL_TEXTURE_2D);
			glBindTexture(GL_TEXTURE_2D,sceneGroupList[i].textureID);

			glActiveTexture(GL_TEXTURE1);
			glEnable(GL_TEXTURE_2D);
			glBindTexture(GL_TEXTURE_2D,sceneGroupList[i].bumpID);
		
			glClientActiveTextureARB(GL_TEXTURE0);
			glEnableClientState(GL_TEXTURE_COORD_ARRAY);
			glBindBufferARB(GL_ARRAY_BUFFER,texCoordBufferID);
			glTexCoordPointer(2,GL_FLOAT,0,0); 
		
		  }

		glBindBufferARB(GL_ELEMENT_ARRAY_BUFFER,sceneGroupList[i].indexBufferID);
		glDrawElements(GL_TRIANGLES,sceneGroupList[i].elementIndex.size(),GL_UNSIGNED_SHORT,
		0);
		
		if(sceneGroupList[i].useTexture){
			glActiveTexture(GL_TEXTURE0);

			glClientActiveTexture(GL_TEXTURE0);
			glDisableClientState(GL_TEXTURE_COORD_ARRAY);
		}

	}

	glDisableClientState(GL_VERTEX_ARRAY);
	glDisableClientState(GL_NORMAL_ARRAY);
	glDisableVertexAttribArray(bumpShader.tangentLoc);
	
	glBindBufferARB(GL_ARRAY_BUFFER,0);
	glBindBufferARB(GL_ELEMENT_ARRAY_BUFFER,0);

	bumpShader.deactivateShader();

  • My gfx card is Geforce 7600GT with latest NVIDIA driver (163.75)

  • tangentArray is an array of float and had a size of 60515*3

  • OS is windows XP

Can someone tell me what might causing the problem ?

2

You should have glBindBufferARB(GL_ARRAY_BUFFER, 0); before your glVertexAttribPointer call, since you aren’t using a VBO for it. :slight_smile:

3

Thank , Now it work as expected.
:slight_smile: