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Enhance shader material to show how to pass material values

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Also document that gl_FrontMaterial is no longer supported in Irrlicht 1.9 (this has been the case for a few years, I just never noticed this was changed as I never even knew that was possible in the past...). Will keep it that way is it's definitely going in the right direction (getting rid of legacy support and going towards OpenGL core instead),

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@6498 dfc29bdd-3216-0410-991c-e03cc46cb475
This commit is contained in:
cutealien
2023-06-24 15:42:31 +00:00
parent cdcb8274ee
commit 35a0c4df8f
4 changed files with 37 additions and 3 deletions
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34
examples/10.Shaders/main.cpp
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@ -48,8 +48,10 @@ class MyShaderCallBack : public video::IShaderConstantSetCallBack
{
public:
MyShaderCallBack() : WorldViewProjID(-1), TransWorldID(-1), InvWorldID(-1), PositionID(-1),
ColorID(-1), TextureID(-1)
ColorID(-1), TextureID(-1), EmissiveID(-1)
{
for ( int i=0; i<4; ++i )
Emissive[i] = 0.f;
}
virtual void OnCreate(video::IMaterialRendererServices* services, s32 userData)
@ -57,14 +59,15 @@ public:
if (UseHighLevelShaders)
{
// Get shader constants id.
// Constants are "uniforms" in most modern shading languages.
// Constants are "uniforms" in other shading languages.
// And they are not constant at all but can be changed before every draw call
// (the naming probably has some historical reasons which got lost in time)
// (the naming probably comes from Direct3D where they are called constants)
WorldViewProjID = services->getVertexShaderConstantID("mWorldViewProj");
TransWorldID = services->getVertexShaderConstantID("mTransWorld");
InvWorldID = services->getVertexShaderConstantID("mInvWorld");
PositionID = services->getVertexShaderConstantID("mLightPos");
ColorID = services->getVertexShaderConstantID("mLightColor");
EmissiveID = services->getPixelShaderConstantID("mEmissive");
// Textures ID are important only for OpenGL interface.
video::IVideoDriver* driver = services->getVideoDriver();
@ -94,6 +97,21 @@ public:
services->setVertexShaderConstant(reinterpret_cast<f32*>(&col), 9, 1);
}
// Called when any SMaterial value changes
virtual void OnSetMaterial(const irr::video::SMaterial& material)
{
// Remember material values to pass them on to shader in OnSetConstants
Emissive[0] = material.EmissiveColor.getRed() / 255.0f;
Emissive[1] = material.EmissiveColor.getGreen() / 255.0f;
Emissive[2] = material.EmissiveColor.getBlue() / 255.0f;
Emissive[3] = material.EmissiveColor.getAlpha() / 255.0f;
// Note: Until Irrlicht 1.8 it was possible to use gl_FrontMaterial in glsl
// This is no longer supported since Irrlicht 1.9
// Reason: Passing always every material value is slow, harder to port
// and generally getting deprecated in newer shader systems.
}
virtual void OnSetConstants(video::IMaterialRendererServices* services,
s32 userData)
{
@ -148,6 +166,12 @@ public:
}
else
services->setVertexShaderConstant(world.pointer(), 10, 4);
// Set material values
if (UseHighLevelShaders)
{
services->setPixelShaderConstant(EmissiveID, Emissive, 4);
}
}
private:
@ -157,6 +181,9 @@ private:
s32 PositionID;
s32 ColorID;
s32 TextureID;
s32 EmissiveID;
irr::f32 Emissive[4];
};
/*
@ -393,6 +420,7 @@ int main()
node->setMaterialFlag(video::EMF_LIGHTING, false);
node->setMaterialFlag(video::EMF_BLEND_OPERATION, true);
node->setMaterialType((video::E_MATERIAL_TYPE)newMaterialType2);
node->getMaterial(0).EmissiveColor = irr::video::SColor(0,50,0,50);
smgr->addTextSceneNode(gui->getBuiltInFont(),
L"PS & VS & EMT_TRANSPARENT",