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Add IMaterialRendererServices::startUseProgram/stopUseProgram

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This makes it possible to set high-level shader constants (which are attached to shader programs) to be set outside
of OnSetConstants.
IShaderConstantSetCallBack::OnCreate has it set automatically now so it works the same as OnSetConstants.
D3D9 and burnings both work different, so there hadn't been a problem with those.


git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@6469 dfc29bdd-3216-0410-991c-e03cc46cb475
This commit is contained in:
cutealien
2023-04-24 14:46:09 +00:00
parent 16c960c5ed
commit c4bbbe1aaf
6 changed files with 71 additions and 18 deletions
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33
examples/10.Shaders/main.cpp
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@ -56,7 +56,7 @@ public:
{
if (UseHighLevelShaders)
{
// get shader constants id.
// Get shader constants id.
WorldViewProjID = services->getVertexShaderConstantID("mWorldViewProj");
TransWorldID = services->getVertexShaderConstantID("mTransWorld");
InvWorldID = services->getVertexShaderConstantID("mInvWorld");
@ -68,6 +68,27 @@ public:
if(driver->getDriverType() == video::EDT_OPENGL)
TextureID = services->getVertexShaderConstantID("myTexture");
}
// Set light color
// That could be set as well in OnSetConstants, but there's some cost to setting shader constants
// So when we have non-changing shader constants it's more performant to set them only once.
video::SColorf col(0.0f,1.0f,1.0f,0.0f);
if (UseHighLevelShaders)
{
services->setVertexShaderConstant(ColorID, reinterpret_cast<f32*>(&col), 4);
// Note: Since Irrlicht 1.9 it's possible to call setVertexShaderConstant
// from anywhere. To do that save the services pointer here in OnCreate, it
// won't change as long as you use one IShaderConstantSetCallBack per shader
// material. But when calling it ouside of IShaderConstantSetCallBack functions
// you have to call services->startUseProgram()stopUseProgram() before/after doing so.
// At least for high-level shader constants, low level constants are not attached
// to programs, so for those it doesn't matter.
// Doing that sometimes makes sense for performance reasons, like for constants which
// do only change once per frame or even less.
}
else
services->setVertexShaderConstant(reinterpret_cast<f32*>(&col), 9, 1);
}
virtual void OnSetConstants(video::IMaterialRendererServices* services,
@ -109,16 +130,6 @@ public:
else
services->setVertexShaderConstant(reinterpret_cast<f32*>(&pos), 8, 1);
// set light color
video::SColorf col(0.0f,1.0f,1.0f,0.0f);
if (UseHighLevelShaders)
services->setVertexShaderConstant(ColorID,
reinterpret_cast<f32*>(&col), 4);
else
services->setVertexShaderConstant(reinterpret_cast<f32*>(&col), 9, 1);
// set transposed world matrix
core::matrix4 world = driver->getTransform(video::ETS_WORLD);