osgEarth的Rex引擎原理分析（六十六）DrawTileCommand中的采样器

目标：（五十五）中的问题137

DrawTileCommand中的颜色采样器_colorSamplers和共享采样器_sharedSamplers的区别，能不能用一个。RenderBindings将采样器分为6个，前2个是颜色采样器，后4个是共享采样器。

osgEarthDrivers/engine_rex/RenderBindings
enum Usage
{
    COLOR         = 0,
    COLOR_PARENT  = 1,
    ELEVATION     = 2,
    NORMAL        = 3,
    COVERAGE      = 4,
    SHARED        = 5   // non-core shared layers start at this index
};

这些采样器，在裁剪器中进行赋值

osgEarthDrivers/engine_rex/TerrainCuller.cpp
DrawTileCommand*
TerrainCuller::addDrawCommand(UID uid, const TileRenderModel* model, const RenderingPass* pass, TileNode* tileNode)
{
        DrawTileCommand* tile = &drawable->_tiles.back();

        // install everything we need in the Draw Command:
        tile->_colorSamplers = pass ? &(pass->samplers()) : 0L;
        tile->_sharedSamplers = &model->_sharedSamplers;
}

 

 

 

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标签：DrawTileCommand,Rex,采样器,pass,tile,sharedSamplers,RenderBindings
来源： https://blog.csdn.net/hankern/article/details/104188262