Gallery3d代码分析之渲染流程.docVIP

gallery3d 的渲染从 RenderView 开始。RenderView 从 GLSurfaceView 继承而来，采用了通知型绘制模式，即通过调用 requestRender 通知 RenderView 重绘屏幕。?RenderView 将所有需要绘制的对象都保存一个 Lists中，Lists 包含了5个ArrayList，其定义如下所示：? Java代码? public?final?ArrayListLayer?updateList?=?new?ArrayListLayer();?? public?final?ArrayListLayer?opaqueList?=?new?ArrayListLayer();?? public?final?ArrayListLayer?blendedList?=?new?ArrayListLayer();?? public?final?ArrayListLayer?hitTestList?=?new?ArrayListLayer();?? public?final?ArrayListLayer?systemList?=?new?ArrayListLayer();?? RenderView 的 onDrawFrame 接口完成每一帧的绘制操作，绘制时遍历 lists 里每个 list 的每一个成员并调用其 renderXXX 函数。主要代码如下所示：? Java代码? ...?? final?Lists?lists?=?sLists;?? ?? final?ArrayListLayer?updateList?=?lists.updateList;?? boolean?isDirty?=?false;?? for?(int?i?=?0,?size?=?updateList.size();?i?!=?size;?++i)?{?? ????boolean?retVal?=?updateList.get(i).update(this,?mFrameInterval);?? ????isDirty?|=?retVal;?? }?? if?(isDirty)?{?? ????requestRender();?? }?? ?? //?Clear?the?depth?buffer.?? gl.glClear(GL11.GL_DEPTH_BUFFER_BIT);?? gl.glEnable(GL11.GL_SCISSOR_TEST);?? gl.glScissor(0,?0,?getWidth(),?getHeight());?? ?? //?Run?the?opaque?pass.?? gl.glDisable(GL11.GL_BLEND);?? final?ArrayListLayer?opaqueList?=?lists.opaqueList;?? for?(int?i?=?opaqueList.size()?-?1;?i?=?0;?--i)?{?? ????final?Layer?layer?=?opaqueList.get(i);?? ????if?(!layer.mHidden)?{?? ????????layer.renderOpaque(this,?gl);?? ????}?? }?? ?? //?Run?the?blended?pass.?? gl.glEnable(GL11.GL_BLEND);?? final?ArrayListLayer?blendedList?=?lists.blendedList;?? for?(int?i?=?0,?size?=?blendedList.size();?i?!=?size;?++i)?{?? ????final?Layer?layer?=?blendedList.get(i);?? ????if?(!layer.mHidden)?{?? ????????layer.renderBlended(this,?gl);?? ????}?? }?? gl.glDisable(GL11.GL_BLEND);?? lists 的各个 list 里包含的各个 layer 如下所示：? Java代码? lists?? ??|------------------|-----------------|-----------------|---------------|?? updateList????????opaqueList????????blendedList??????systemList?????hitTestList?? ??|??????????????????|?????????????????|?????????????????|