版本 3.0
每个属性都与组件计数,类型,标准化,偏移,步幅和 VBO 相关联。VBO 没有作为参数显式传递,而是在调用时绑定到 GL_ARRAY_BUFFER 的缓冲区。
void prepareMeshForRender(Mesh mesh){
glBindVertexArray(mesh.vao);
glBindBuffer(GL_ARRAY_BUFFER, mesh.vbo);
glVertexAttribPointer (posAttrLoc, 3, GL_FLOAT, false, sizeof(Vertex), mesh.vboOffset + offsetof(Vertex, pos));//will associate mesh.vbo with the posAttrLoc
glEnableVertexAttribArray(posAttrLoc);
glVertexAttribPointer (normalAttrLoc, 3, GL_FLOAT, false, sizeof(Vertex), mesh.vboOffset + offsetof(Vertex, normal));
glEnableVertexAttribArray(normalAttrLoc);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, mesh.ebo); //this binding is also saved.
glBindVertexArray(0);
}
void drawMesh(Mesh[] meshes){
foreach(mesh in meshes){
glBindVertexArray(mesh.vao);
glDrawElements(GL_TRIANGLES, mesh.vertexCount, GL_UNSIGNED_INT, mesh.indexOffset);
}
}