Method writeTransforms

examples/OpenGLWindow/GLInstancingRenderer.cpp:714–847

}

void GLInstancingRenderer::writeTransforms()
{
	{
		//B3_PROFILE("b3Assert(glGetError() 1");
		b3Assert(glGetError() == GL_NO_ERROR);
	}
	{
		//B3_PROFILE("glBindBuffer");
		glBindBuffer(GL_ARRAY_BUFFER, m_data->m_vbo);
	}

	{
		//B3_PROFILE("glFlush()");
		//without the flush, the glBufferSubData can spike to really slow (seconds slow)
		glFlush();
	}

	{
		//B3_PROFILE("b3Assert(glGetError() 2");
		b3Assert(glGetError() == GL_NO_ERROR);
	}

#ifdef B3_DEBUG
	{
		//B3_PROFILE("m_data->m_totalNumInstances == totalNumInstances");

		int totalNumInstances = 0;
		for (int k = 0; k < m_graphicsInstances.size(); k++)
		{
			b3GraphicsInstance* gfxObj = m_graphicsInstances[k];
			totalNumInstances += gfxObj->m_numGraphicsInstances;
		}
		b3Assert(m_data->m_totalNumInstances == totalNumInstances);
	}
#endif  //B3_DEBUG

	int POSITION_BUFFER_SIZE = (m_data->m_totalNumInstances * sizeof(float) * 4);
	int ORIENTATION_BUFFER_SIZE = (m_data->m_totalNumInstances * sizeof(float) * 4);
	int COLOR_BUFFER_SIZE = (m_data->m_totalNumInstances * sizeof(float) * 4);
	//	int SCALE_BUFFER_SIZE = (totalNumInstances*sizeof(float)*4);

#if 1
	{
		//	printf("m_data->m_totalNumInstances = %d\n", m_data->m_totalNumInstances);
		{
			//B3_PROFILE("glBufferSubData pos");
			glBufferSubData(GL_ARRAY_BUFFER, m_data->m_maxShapeCapacityInBytes, m_data->m_totalNumInstances * sizeof(float) * 4,
							&m_data->m_instance_positions_ptr[0]);
		}
		{
			//			B3_PROFILE("glBufferSubData orn");
			glBufferSubData(GL_ARRAY_BUFFER, m_data->m_maxShapeCapacityInBytes + POSITION_BUFFER_SIZE, m_data->m_totalNumInstances * sizeof(float) * 4,
							&m_data->m_instance_quaternion_ptr[0]);
		}
		{
			//			B3_PROFILE("glBufferSubData color");
			glBufferSubData(GL_ARRAY_BUFFER, m_data->m_maxShapeCapacityInBytes + POSITION_BUFFER_SIZE + ORIENTATION_BUFFER_SIZE, m_data->m_totalNumInstances * sizeof(float) * 4,
							&m_data->m_instance_colors_ptr[0]);