ogrenext学习笔记Day7

通过之前的分析&＃xff0c;知晓 hlms 的重要性。对hlms做一个详细的分析

hlms文件结构以及对象

从图中看出&＃xff0c;hlms的文件不多&＃xff0c;对象也不多&＃xff0c;关系简单。

类图

能看懂就行&＃xff0c;不求格式

对象大概能分为几类

• Hlms
• HlmsProperty
• HlmsDatablock
• StaticBlock
• HlmsJson
• 其他

每一种 hlms都有一个对应的property&＃xff0c;这些property由一些const idString 标识它支持的属性。
例如

struct _OgreHlmsUnlitMobileExport UnlitMobileProp{static const IdString TexMatrixCount;static const IdString TexMatrixCount0;static const IdString TexMatrixCount1;static const IdString TexMatrixCount2;static const IdString TexMatrixCount3;static const IdString TexMatrixCount4;static const IdString TexMatrixCount5;static const IdString TexMatrixCount6;static const IdString TexMatrixCount7;// ...}const IdString UnlitMobileProp::TexMatrixCount &＃61; IdString( "hlms_texture_matrix_count" );const IdString UnlitMobileProp::TexMatrixCount0 &＃61; IdString( "hlms_texture_matrix_count0" );const IdString UnlitMobileProp::TexMatrixCount1 &＃61; IdString( "hlms_texture_matrix_count1" );const IdString UnlitMobileProp::TexMatrixCount2 &＃61; IdString( "hlms_texture_matrix_count2" );const IdString UnlitMobileProp::TexMatrixCount3 &＃61; IdString( "hlms_texture_matrix_count3" );const IdString UnlitMobileProp::TexMatrixCount4 &＃61; IdString( "hlms_texture_matrix_count4" );const IdString UnlitMobileProp::TexMatrixCount5 &＃61; IdString( "hlms_texture_matrix_count5" );const IdString UnlitMobileProp::TexMatrixCount6 &＃61; IdString( "hlms_texture_matrix_count6" );const IdString UnlitMobileProp::TexMatrixCount7 &＃61; IdString( "hlms_texture_matrix_count7" );


每个hlms 都有一个 datablock
例如

class HlmsUnlitMobileDatablock : public HlmsDatablock
{/** Valid parameters in params:&＃64;param params* diffuse [r g b [a]]If absent, the values of mR, mG, mB & mA will be ignored by the pixel shader.When present, the rgba values can be specified.Default: AbsentDefault (when present): diffuse 1 1 1 1* diffuse_map [texture name] [#uv]Name of the diffuse texture for the base image (optional, otherwise a dummy is set)The #uv parameter is optional, and specifies the texcoord set that willbe used. Valid range is [0; 8)If the Renderable doesn&＃39;t have enough UV texcoords, HLMS will throw an exception.Note: The UV set is evaluated when creating the Renderable cache.* diffuse_map1 [texture name] [blendmode] [#uv]Name of the diffuse texture that will be layered on top of the base image.The #uv parameter is optional. Valid range is [0; 8)The blendmode parameter is optional. Valid values are:NormalNonPremul, NormalPremul, Add, Subtract, Multiply,Multiply2x, Screen, Overlay, Lighten, Darken, GrainExtract,GrainMerge, Differencewhich are very similar to Photoshop/GIMP&＃39;s blend modes.See Samples/Media/Hlms/GuiMobile/GLSL/BlendModes_piece_ps.glsl for the exact math.Default blendmode: NormalPremulDefault uv: 0Example: diffuse_map1 myTexture.png Add 3* diffuse_map2 through diffuse_map16Same as diffuse_map1 but for subsequent layers to be applied on top of the previousimages. You can&＃39;t leave gaps (i.e. specify diffuse_map0 & diffuse_map2 but notdiffuse_map1).Note that not all mobile HW supports 16 textures at the same time, thus we willjust cut/ignore the extra textures that won&＃39;t fit (we log a warning though).* animate <#uv> [<#uv> <#uv> ... <#uv>]Enables texture animation through a 4x4 matrix for the specified UV sets.Default: All UV set animation/manipulation disabled.Example: animate 0 1 2 3 4 5 6 7* alpha_test [compare_func] [threshold]When present, mAlphaTestThreshold is used.compare_func is optional. Valid values are:less, less_equal, equal, greater, greater_equal, not_equalThreshold is optional, and a value in the range (0; 1)Default: alpha_test less 0.5Example: alpha_test equal 0.1*/
}


这里通过注释的方式&＃xff0c;把每个支持的数据都标出来了。通过之前的学习知道&＃xff0c;这些数据可以来自script&＃xff0c;也可以通过代码设置。

datablock里的数据与property里的是一一对应的&＃xff0c;renderable持有了一个datablock&＃xff0c;最终会把 datablock里的数据设置到property里。

void HlmsPbs::calculateHashForPreCreate( Renderable *renderable, PiecesMap *inOutPieces )
{assert( dynamic_cast<HlmsPbsDatablock*>( renderable->getDatablock() ) );HlmsPbsDatablock *datablock &＃61; static_cast<HlmsPbsDatablock*>(renderable->getDatablock() );const bool metallicWorkflow &＃61; datablock->getWorkflow() &＃61;&＃61; HlmsPbsDatablock::MetallicWorkflow;const bool fresnelWorkflow &＃61; datablock->getWorkflow() &＃61;&＃61;HlmsPbsDatablock::SpecularAsFresnelWorkflow;setProperty( PbsProperty::FresnelScalar, datablock->hasSeparateFresnel() || metallicWorkflow );setProperty( PbsProperty::FresnelWorkflow, fresnelWorkflow );setProperty( PbsProperty::MetallicWorkflow, metallicWorkflow );
// ...}


已知的是&＃xff0c;创建的时候是通过item->setDatablock(…)

void Item::setDatablock( HlmsDatablock *datablock ){SubItemVec::iterator itor &＃61; mSubItems.begin();SubItemVec::iterator end &＃61; mSubItems.end();while( itor !&＃61; end ){itor->setDatablock( datablock );&＃43;&＃43;itor;}}


内部会调用 subItem->setDatablock(…)

void Renderable::setDatablock( HlmsDatablock *datablock )
{
// ...
}


class _OgreExport SubItem : public RenderableAnimated


class _OgreExport RenderableAnimated : public Renderable


SubItem 是 Renderable。

从material 到 hlms property&＃xff0c;hlms 算走通了一半。设置完属性后&＃xff0c;就应该设置往shader送数据了。
还有 hlms的几个cache没有涉及到

to be continue…