Method registerShape

examples/OpenGLWindow/GLInstancingRenderer.cpp:1162–1232

}

int GLInstancingRenderer::registerShape(const float* vertices, int numvertices, const int* indices, int numIndices, int primitiveType, int textureId)
{
	b3GraphicsInstance* gfxObj = new b3GraphicsInstance;

	if (textureId >= 0)
	{
		gfxObj->m_textureIndex = textureId;
		gfxObj->m_flags |= B3_INSTANCE_TEXTURE;
	}

	gfxObj->m_primitiveType = primitiveType;

	if (m_graphicsInstances.size())
	{
		b3GraphicsInstance* prevObj = m_graphicsInstances[m_graphicsInstances.size() - 1];
		gfxObj->m_instanceOffset = prevObj->m_instanceOffset + prevObj->m_numGraphicsInstances;
		gfxObj->m_vertexArrayOffset = prevObj->m_vertexArrayOffset + prevObj->m_numVertices;
	}
	else
	{
		gfxObj->m_instanceOffset = 0;
	}

	m_graphicsInstances.push_back(gfxObj);
	gfxObj->m_numIndices = numIndices;
	gfxObj->m_numVertices = numvertices;

	int vertexStrideInBytes = 9 * sizeof(float);
	int sz = numvertices * vertexStrideInBytes;
	int totalUsed = vertexStrideInBytes * gfxObj->m_vertexArrayOffset + sz;
	b3Assert(totalUsed < m_data->m_maxShapeCapacityInBytes);
	if (totalUsed >= m_data->m_maxShapeCapacityInBytes)
	{
		return -1;
	}

	glBindBuffer(GL_ARRAY_BUFFER, m_data->m_vbo);

#if 0

	char* dest=  (char*)glMapBuffer( GL_ARRAY_BUFFER,GL_WRITE_ONLY);//GL_WRITE_ONLY

#ifdef B3_DEBUG

#endif  //B3_DEBUG

	memcpy(dest+vertexStrideInBytes*gfxObj->m_vertexArrayOffset,vertices,sz);
	glUnmapBuffer( GL_ARRAY_BUFFER);
#else
	glBufferSubData(GL_ARRAY_BUFFER, vertexStrideInBytes * gfxObj->m_vertexArrayOffset, sz,
					vertices);
#endif

	glGenBuffers(1, &gfxObj->m_index_vbo);

	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, gfxObj->m_index_vbo);
	int indexBufferSizeInBytes = gfxObj->m_numIndices * sizeof(int);