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<td bgcolor="#666699" width="10"><b><a href="http://irrlicht.sourceforge.net" target="_blank"><img src="../../media/irrlichtlogo.jpg" width="88" height="31" border="0"></a></b></td>
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<div align="left"><b><font color="#FFFFFF">Tutorial 10. Shaders</font></b></div>
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<p> This tutorial shows how to use shaders for D3D8, D3D9 and OpenGL with
the engine and how to create new material types with them. It also shows
how to disable the generation of mipmaps at texture loading, and how
to use text scene nodes.</p>
<p>This tutorial does not explain how shaders work. I would recommend
to read the D3D or OpenGL documentation, to search a tutorial, or to
read a book about this.</p>
<p>The program which is described here will look like this:</p>
<p align="center"><img src="../../media/010shot.jpg" width="260" height="203"><br>
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<td bgcolor="#666699"> <b><font color="#FFFFFF">Lets start!</font></b></td>
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<p>At first, we need to include all headers and do the stuff we always
do, like in nearly all other tutorials:</p>
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<td> <pre>#include <irrlicht.h><br>#include <iostream><br><br>using namespace irr;<br><br>#pragma comment(lib, "Irrlicht.lib")<br></pre></td>
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<p>Because we want to use some interesting shaders in this tutorials,
we need to set some data for them to make them able to compute nice
colors. In this example, we'll use a simple vertex shader which will
calculate the color of the vertex based on the position of the camera.
For this, the shader needs the following data: The inverted world
matrix for transforming the normal, the clip matrix for transforming
the position, the camera position and the world position of the object
for the calculation of the angle of light, and the color of the light.
To be able to tell the shader all this data every frame, we have to
derive a class from the IShaderConstantSetCallBack interface and override
its only method, namely OnSetConstants(). This method will be called
every time the material is set. <br>
The method setVertexShaderConstant() of the IMaterialRendererServices
interface is used to set the data the shader needs. If the user chose
to use a High Level shader language like HLSL instead of Assembler
in this example, you have to set the variable name as parameter instead
of the register index.</p>
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<td> <pre>IrrlichtDevice* device = 0;<br>bool UseHighLevelShaders = false;<br><br>class MyShaderCallBack : public video::IShaderConstantSetCallBack<br>{<br>public:
<br> virtual void OnSetConstants(video::IMaterialRendererServices* services, s32 userData)<br> {<br> video::IVideoDriver* driver = services->getVideoDriver();<br><br> <font color="#006600">// set inverted world matrix<br> // if we are using highlevel shaders (the user can select this when<br> // starting the program), we must set the constants by name.</font><br> core::matrix4 invWorld = driver->getTransform(video::ETS_WORLD);<br> invWorld.makeInverse();<br><br> if (UseHighLevelShaders)<br> services->setVertexShaderConstant("mInvWorld", &invWorld.M[0], 16);<br> else<br> services->setVertexShaderConstant(&invWorld.M[0], 0, 4);<br><font color="#006600"><br> // set clip matrix<br></font> core::matrix4 worldViewProj;<br> worldViewProj = driver->getTransform(video::ETS_PROJECTION); <br> worldViewProj *= driver->getTransform(video::ETS_VIEW);<br> worldViewProj *= driver->getTransform(video::ETS_WORLD);<br><br> if (UseHighLevelShaders)<br> services->setVertexShaderConstant("mWorldViewProj", &worldViewProj.M[0], 16);<br> else<br> services->setVertexShaderConstant(&worldViewProj.M[0], 4, 4);<br> <br><font color="#006600"> </font><font color="#006600">// set camera position<br></font> core::vector3df pos = device->getSceneManager()-><br> getActiveCamera()->getAbsolutePosition();<br><br> if (UseHighLevelShaders)<br> services->setVertexShaderConstant("mLightPos", reinterpret_cast<f32*>(&pos), 3);<br> else<br> services->setVertexShaderConstant(reinterpret_cast<f32*>(&pos), 8, 1);<br><br><font color="#006600"> </font><font color="#006600">// set light color <br></font> video::SColorf col(0.0f,1.0f,1.0f,0.0f);<br><br> if (UseHighLevelShaders)<br> services->setVertexShaderConstant("mLightColor", reinterpret_cast<f32*>(&col), 4);<br> else<br> services->setVertexShaderConstant(reinterpret_cast<f32*>(&col), 9, 1);<br><br><font color="#006600"> </font><font color="#006600">// set transposed world matrix<br></font> core::matrix4 world = driver->getTransform(video::ETS_WORLD);<br> world = world.getTransposed();<br><br> if (UseHighLevelShaders)<br> services->setVertexShaderConstant("mTransWorld", &world.M[0], 16);<br> else<br> services->setVertexShaderConstant(&world.M[0], 10, 4);<br> }<br>};</pre></td>
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<p> The next few lines start up the engine. Just like in most other
tutorials before. But in addition, we ask the user if he wants this
example to use high level shaders if he selected a driver which is
capable of doing so.</p>
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<td> <pre>int main()<br>{<br><font color="#006600"> // let user select driver type</font><br><br> video::E_DRIVER_TYPE driverType = video::EDT_DIRECTX9;<br><br> printf("Please select the driver you want for this example:\n"\<br> " (a) Direct3D 9.0c\n (b) Direct3D 8.1\n (c) OpenGL 1.5\n"\<br> " (d) Software Renderer\n (e) Apfelbaum Software Renderer\n"\<br> " (f) NullDevice\n (otherKey) exit\n\n");<br><br> char i;<br> std::cin >> i;<br><br> switch(i)<br> {<br> case 'a': driverType = video::EDT_DIRECT3D9;break;<br> case 'b': driverType = video::EDT_DIRECT3D8;break;<br> case 'c': driverType = video::EDT_OPENGL; break;<br> case 'd': driverType = video::EDT_SOFTWARE; break;<br> case 'e': driverType = video::EDT_BURNINGSVIDEO;break;<br> case 'f': driverType = video::EDT_NULL; break;<br> default: return 1;<br> } <br><br><font color="#006600"> </font> <font color="#006600">// ask the user if we should use high level shaders for this example<br> </font> if (driverType == video::EDT_DIRECT3D9 ||<br> driverType == video::EDT_OPENGL)
{<br> printf("<font color="#CC0000">Please press 'y' if you want to use high level shaders.\n</font>");<br> std::cin >> i;<br> if (i == 'y')<br> UseHighLevelShaders = true;<br> }<br><br><font color="#006600"> // create devic</font>e<br><br> device = createDevice(driverType, core::dimension2d<s32>(640, 480));<br><br> if (device == 0)<br> {<br> printf(<font color="#CC0000">"\nWas not able to create driver.\n"\<br> "Please restart and select another driver.\n"</font>);<br> getch();<br> return 1;<br> } <br><br> video::IVideoDriver* driver = device->getVideoDriver();<br> scene::ISceneManager* smgr = device->getSceneManager();<br> gui::IGUIEnvironment* gui = device->getGUIEnvironment();</pre></td>
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<p> Now for the more interesting parts. If we are using Direct3D, we
want to load vertex and pixel shader programs, if we have<br>
OpenGL, we want to use ARB fragment and vertex programs. I wrote the
corresponding programs down into the files d3d8.ps, d3d8.vs, d3d9.ps,
d3d9.vs, opengl.ps and opengl.vs. We only need the right filenames
now. This is done in the following switch. Note, that it is not necessary
to write the shaders into text files, like in this example. You can
even write the shaders directly as strings into the cpp source file,
and use later addShaderMaterial() instead of addShaderMaterialFromFiles().</p>
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<td> <pre> c8* vsFileName = 0<font color="#006600">; // filename for the vertex shader</font><br> c8* psFileName = 0<font color="#006600">; // filename for the pixel shader</font><br><br> switch(driverType)<br> {<br> case video::EDT_DIRECT3D8:<br> psFileName = "../../media/d3d8.psh";<br> vsFileName = "../../media/d3d8.vsh";<br> break;<br> case video::EDT_DIRECT3D9:<br> if (UseHighLevelShaders)<br> {<br> psFileName = "../../media/d3d9.hlsl";<br> vsFileName = psFileName; <font color="#006600">// both shaders are in the same file</font><br> }<br> else<br> {<br> psFileName = "../../media/d3d9.psh";<br> vsFileName = "../../media/d3d9.vsh";<br> }<br> break;<br> case video::EDT_OPENGL:<br> if (UseHighLevelShaders)<br> {<br> psFileName = "../../media/opengl.frag";<br> vsFileName = "../../media/opengl.vert";<br> }<br> else<br> {<br> psFileName = "../../media/opengl.psh";<br> vsFileName = "../../media/opengl.vsh";<br> }<br> break;<br> }<br></pre>
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<p> In addition, we check if the hardware and the selected renderer
is capable of executing the shaders we want. If not, we simply set
the filename string to 0. This is not necessary, but useful in this
example: For example, if the hardware is able to execute vertex shaders
but not pixel shaders, we create a new material which only uses the
vertex shader, and no pixel shader. Otherwise, if we would tell the
engine to create this material and the engine sees that the hardware
wouldn't be able to fullfill the request completely,<br>
it would not create any new material at all. So in this example you
would see at least the vertex shader in action, without the pixel
shader.</p>
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<td> <pre> if (!driver->queryFeature(video::EVDF_PIXEL_SHADER_1_1) &&<br> !driver->queryFeature(video::EVDF_ARB_FRAGMENT_PROGRAM_1))<br> {<br> device->getLogger()->log("WARNING: Pixel shaders disabled "\<br> "because of missing driver/hardware support.");<br> psFileName = 0;<br> }<br> <br> if (!driver->queryFeature(video::EVDF_VERTEX_SHADER_1_1) &&<br> !driver->queryFeature(video::EVDF_ARB_VERTEX_PROGRAM_1))<br> {<br> device->getLogger()->log("WARNING: Vertex shaders disabled "\<br> "because of missing driver/hardware support.");<br> vsFileName = 0;<br> }</pre></td>
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<p> Now lets create the new materials.<br>
As you maybe know from previous examples, a material type in the Irrlicht
engine is set by simply changing the MaterialType value in the SMaterial
struct. And this value is just a simple 32 bit value, like video::EMT_SOLID.
So we only need the engine to create a new value for us which we can
set there. To do this, we get a pointer to the IGPUProgrammingServices
and call addShaderMaterialFromFiles(), which returns such a new 32 bit
value. That's all.<br>
The parameters to this method are the following: First, the names of
the files containing the code of the vertex and the pixel shader.<br>
If you would use addShaderMaterial() instead, you would not need file
names, then you could write the code of the shader directly as string.
The following parameter is a pointer to the IShaderConstantSetCallBack
class we wrote at the beginning of this tutorial. If you don't want
to set constants, set this to 0. The last paramter tells the engine
which material it should use as base material. <br>
To demonstrate this, we create two materials with a different base material,
one with EMT_SOLID and one with EMT_TRANSPARENT_ADD_COLOR.</p>
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<td><pre> <font color="#006600">// create materials</font><br><br> video::IGPUProgrammingServices* gpu = driver->getGPUProgrammingServices();<br><br> s32 newMaterialType1 = 0;<br> s32 newMaterialType2 = 0;<br><br> if (gpu)<br> {<br> MyShaderCallBack* mc = new MyShaderCallBack();<br> <font color="#006600">
// create the shaders depending on if the user wanted high level<br> // or low level shaders:</font><br><br> if (UseHighLevelShaders)<br> {<br><font color="#006600"> // create material from high level shaders (hlsl or glsl)<br><br></font> newMaterialType1 = gpu->addHighLevelShaderMaterialFromFiles(<br> vsFileName, "vertexMain", video::EVST_VS_1_1,<br> psFileName, "pixelMain", video::EPST_PS_1_1,<br> mc, video::EMT_SOLID);<br><br> newMaterialType2 = gpu->addHighLevelShaderMaterialFromFiles(<br> vsFileName, "vertexMain", video::EVST_VS_1_1,<br> psFileName, "pixelMain", video::EPST_PS_1_1,<br> mc, video::EMT_TRANSPARENT_ADD_COLOR);<br> }<br> else<br> {<br><font color="#009900"> // create material from low level shaders (asm or arb_asm)<br></font><br> newMaterialType1 = gpu->addShaderMaterialFromFiles(vsFileName,<br> psFileName, mc, video::EMT_SOLID);<br><br> newMaterialType2 = gpu->addShaderMaterialFromFiles(vsFileName,<br> psFileName, mc, video::EMT_TRANSPARENT_ADD_COLOR);<br> }<br><br> mc->drop();<br> }<br></pre></td>
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<p> Now its time for testing out the materials. We create a test cube
and set the material we created. In addition, we add a text scene node
to the cube and a rotatation animator, to make it look more interesting
and important. </p>
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<td><pre><font color="#006600">
// create test scene node 1, with the new created material type 1</font>
scene::ISceneNode* node = smgr->addCubeSceneNode(50);
node->setPosition(core::vector3df(0,0,0));
node->setMaterialTexture(0, driver->getTexture("../../media/wall.bmp"));
node->setMaterialFlag(video::EMF_LIGHTING, false);
node->setMaterialType((video::E_MATERIAL_TYPE)newMaterialType1);
smgr->addTextSceneNode(gui->getBuiltInFont(),
L"PS & VS & EMT_SOLID",
video::SColor(255,255,255,255), node);
scene::ISceneNodeAnimator* anim = smgr->createRotationAnimator(
core::vector3df(0,0.3f,0));
node->addAnimator(anim);
anim->drop();</pre></td>
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<p> Same for the second cube, but with the second material we created.</p>
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<td><pre> <font color="#006600">// create test scene node 2, with the new created material type 2</font>
node = smgr->addCubeSceneNode(50);
node->setPosition(core::vector3df(0,-10,50));
node->setMaterialTexture(0, driver->getTexture("../../media/wall.bmp"));
node->setMaterialFlag(video::EMF_LIGHTING, false);
node->setMaterialType((video::E_MATERIAL_TYPE)newMaterialType2);
smgr->addTextSceneNode(gui->getBuiltInFont(),
L"PS & VS & EMT_TRANSPARENT",
video::SColor(255,255,255,255), node);
anim = smgr->createRotationAnimator(core::vector3df(0,0.3f,0));
node->addAnimator(anim);
anim->drop();</pre></td>
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<br>
Then we add a third cube without a shader on it, to be able to compare
the cubes.<br>
<br>
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<td><pre> <font color="#006600">// add a scene node with no shader </font>
node = smgr->addCubeSceneNode(50);
node->setPosition(core::vector3df(0,50,25));
node->setMaterialTexture(0, driver->getTexture("../../media/wall.bmp"));
node->setMaterialFlag(video::EMF_LIGHTING, false);
smgr->addTextSceneNode(gui->getBuiltInFont(), L"NO SHADER",
video::SColor(255,255,255,255), node);
</pre></td>
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<br>
And last, we add a skybox and a user controlled camera to the scene. For
the skybox textures, we disable mipmap generation, because we don't need
mipmaps on it.<br>
<br>
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<td><pre> <font color="#006600">// add a nice skybox</font><br><br> driver->setTextureCreationFlag(video::ETCF_CREATE_MIP_MAPS, false);<br><br> smgr->addSkyBoxSceneNode(<br> driver->getTexture("../../media/irrlicht2_up.jpg"),<br> driver->getTexture("../../media/irrlicht2_dn.jpg"),<br> driver->getTexture("../../media/irrlicht2_lf.jpg"),<br> driver->getTexture("../../media/irrlicht2_rt.jpg"),<br> driver->getTexture("../../media/irrlicht2_ft.jpg"),<br> driver->getTexture("../../media/irrlicht2_bk.jpg"));<br><br> driver->setTextureCreationFlag(video::ETCF_CREATE_MIP_MAPS, true);<br><br><font color="#006600"> // add a camera and disable the mouse curso</font>r<br><br> scene::ICameraSceneNode* cam = smgr->addCameraSceneNodeFPS(0, 100.0f, 100.0f);<br> cam->setPosition(core::vector3df(-100,50,100));<br> cam->setTarget(core::vector3df(0,0,0));<br> device->getCursorControl()->setVisible(false);</pre></td>
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<br>
Now draw everything. That's all.<br>
<br>
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<td><pre> int lastFPS = -1;<br><br> while(device->run())<br> if (device->isWindowActive())<br> {<br> driver->beginScene(true, true, video::SColor(255,0,0,0));<br> smgr->drawAll();<br> driver->endScene();<br><br> int fps = driver->getFPS();<br><br> if (lastFPS != fps)<br> {<br> core::stringw str = L"Irrlicht Engine - Vertex and pixel shader example [";<br> str += driver->getName();<br> str += "] FPS:";<br> str += fps;<br> device->setWindowCaption(str.c_str());<br> lastFPS = fps;<br> }<br> }<br><br> device->drop();<br> <br> return 0;<br></pre></td>
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<br>
Compile and run this, and I hope you have fun with your new little shader
writing tool :).<br>
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<td bgcolor="#666699"> <b><font color="#FFFFFF">Shader files</font></b></td>
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<td height="90" bgcolor="#eeeeff" valign="top"> <div align="left">
<div align="left">
<p>The files containing the shaders can be found in the media directory
of the SDK. However, they look like this:</p>
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<td><strong>D3D9.HLSL</strong></td>
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<td>
<pre>
// part of the Irrlicht Engine Shader example.
// These simple Direct3D9 pixel and vertex shaders will be loaded by the shaders
// example. Please note that these example shaders don't do anything really useful.
// They only demonstrate that shaders can be used in Irrlicht.
//-----------------------------------------------------------------------------
// Global variables
//-----------------------------------------------------------------------------
float4x4 mWorldViewProj; // World * View * Projection transformation
float4x4 mInvWorld; // Inverted world matrix
float4x4 mTransWorld; // Transposed world matrix
float3 mLightPos; // Light position
float4 mLightColor; // Light color
// Vertex shader output structure
struct VS_OUTPUT
{
float4 Position : POSITION; // vertex position
float4 Diffuse : COLOR0; // vertex diffuse color
float2 TexCoord : TEXCOORD0; // tex coords
};
VS_OUTPUT vertexMain( in float4 vPosition : POSITION,
in float3 vNormal : NORMAL,
float2 texCoord : TEXCOORD0 )
{
VS_OUTPUT Output;
// transform position to clip space
Output.Position = mul(vPosition, mWorldViewProj);
// transform normal
float3 normal = mul(vNormal, mInvWorld);
// renormalize normal
normal = normalize(normal);
// position in world coodinates
float3 worldpos = mul(mTransWorld, vPosition);
// calculate light vector, vtxpos - lightpos
float3 lightVector = worldpos - mLightPos;
// normalize light vector
lightVector = normalize(lightVector);
// calculate light color
float3 tmp = dot(-lightVector, normal);
tmp = lit(tmp.x, tmp.y, 1.0);
tmp = mLightColor * tmp.y;
Output.Diffuse = float4(tmp.x, tmp.y, tmp.z, 0);
Output.TexCoord = texCoord;
return Output;
}
// Pixel shader output structure
struct PS_OUTPUT
{
float4 RGBColor : COLOR0; // Pixel color
};
sampler2D tex0;
PS_OUTPUT pixelMain( float2 TexCoord : TEXCOORD0,
float4 Position : POSITION,
float4 Diffuse : COLOR0 )
{
PS_OUTPUT Output;
float4 col = tex2D( tex0, TexCoord ); // sample color map
// multiply with diffuse and do other senseless operations
Output.RGBColor = Diffuse * col;
Output.RGBColor *= 4.0;
return Output;
}</pre></td>
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<td><strong>D3D9.VSH</strong></td>
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<td> <pre>
; part of the Irrlicht Engine Shader example.
; This Direct3D9 vertex shader will be loaded by the engine.
; Please note that these example shaders don't do anything really useful.
; They only demonstrate that shaders can be used in Irrlicht.<br>
vs.1.1
dcl_position v0; ; declare position
dcl_normal v1; ; declare normal
dcl_color v2; ; declare color
dcl_texcoord0 v3; ; declare texture coordinate<br>
; transpose and transform position to clip space
mul r0, v0.x, c4
mad r0, v0.y, c5, r0
mad r0, v0.z, c6, r0
add oPos, c7, r0
; transform normal
dp3 r1.x, v1, c0
dp3 r1.y, v1, c1
dp3 r1.z, v1, c2
; renormalize normal
dp3 r1.w, r1, r1
rsq r1.w, r1.w
mul r1, r1, r1.w
; calculate light vector
m4x4 r6, v0, c10 ; vertex into world position
add r2, c8, -r6 ; vtxpos - lightpos
; normalize light vector
dp3 r2.w, r2, r2
rsq r2.w, r2.w
mul r2, r2, r2.w
; calculate light color
dp3 r3, r1, r2 ; dp3 with negative light vector
lit r5, r3 ; clamp to zero if r3 < 0, r5 has diffuce component in r5.y
mul oD0, r5.y, c9 ; ouput diffuse color
mov oT0, v3 ; store texture coordinates </pre> </td>
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<td><strong>D3D9.PSH</strong></td>
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<td> <pre>
; part of the Irrlicht Engine Shader example.
; This simple Direct3D9 pixel shader will be loaded by the engine.
; Please note that these example shaders don't do anything really useful.
; They only demonstrate that shaders can be used in Irrlicht.<br>
ps.1.1
tex t0 ; sample color map
add r0, v0, v0 ; mulitply with color
mul t0, t0, r0 ; mulitply with color
add r0, t0, t0 ; make it brighter and store result
</pre> </td>
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<br>
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<td><strong>D3D8.VSH</strong></td>
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<tr>
<td> <pre>
; part of the Irrlicht Engine Shader example.
; This Direct3D9 vertex shader will be loaded by the engine.
; Please note that these example shaders don't do anything really useful.
; They only demonstrate that shaders can be used in Irrlicht.<br>
vs.1.1
; transpose and transform position to clip space
mul r0, v0.x, c4
mad r0, v0.y, c5, r0
mad r0, v0.z, c6, r0
add oPos, c7, r0
; transform normal
dp3 r1.x, v1, c0
dp3 r1.y, v1, c1
dp3 r1.z, v1, c2
; renormalize normal
dp3 r1.w, r1, r1
rsq r1.w, r1.w
mul r1, r1, r1.w
; calculate light vector
m4x4 r6, v0, c10 ; vertex into world position
add r2, c8, -r6 ; vtxpos - lightpos
; normalize light vector
dp3 r2.w, r2, r2
rsq r2.w, r2.w
mul r2, r2, r2.w
; calculate light color
dp3 r3, r1, r2 ; dp3 with negative light vector
lit r5, r3 ; clamp to zero if r3 < 0, r5 has diffuce component in r5.y
mul oD0, r5.y, c9 ; ouput diffuse color
mov oT0, v3 ; store texture coordinates </pre> </td>
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<td><strong>D3D8.PSH</strong></td>
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<td> <pre>
; part of the Irrlicht Engine Shader example.
; This simple Direct3D9 pixel shader will be loaded by the engine.
; Please note that these example shaders don't do anything really useful.
; They only demonstrate that shaders can be used in Irrlicht.<br>
ps.1.1
tex t0 ; sample color map
mul_x2 t0, t0, v0 ; mulitply with color
add r0, t0, t0 ; make it brighter and store result </pre> </td>
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<td><strong>OPENGL.VSH</strong></td>
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<td> <pre>
!!ARBvp1.0
# part of the Irrlicht Engine Shader example.
# Please note that these example shaders don't do anything really useful.
# They only demonstrate that shaders can be used in Irrlicht.<br>
#input
ATTRIB InPos = vertex.position;
ATTRIB InColor = vertex.color;
ATTRIB InNormal = vertex.normal;
ATTRIB InTexCoord = vertex.texcoord;
#output
OUTPUT OutPos = result.position;
OUTPUT OutColor = result.color;
OUTPUT OutTexCoord = result.texcoord;
PARAM MVP[4] = { state.matrix.mvp }; # modelViewProjection matrix.
TEMP Temp;
TEMP TempColor;
TEMP TempNormal;
TEMP TempPos;
#transform position to clip space
DP4 Temp.x, MVP[0], InPos;
DP4 Temp.y, MVP[1], InPos;
DP4 Temp.z, MVP[2], InPos;
DP4 Temp.w, MVP[3], InPos;
#transform normal
DP3 TempNormal.x, InNormal.x, program.local[0];
DP3 TempNormal.y, InNormal.y, program.local[1];
DP3 TempNormal.z, InNormal.z, program.local[2];
#renormalize normal
DP3 TempNormal.w, TempNormal, TempNormal;
RSQ TempNormal.w, TempNormal.w;
MUL TempNormal, TempNormal, TempNormal.w;
# calculate light vector
DP4 TempPos.x, InPos, program.local[10]; # vertex into world position
DP4 TempPos.y, InPos, program.local[11];
DP4 TempPos.z, InPos, program.local[12];
DP4 TempPos.w, InPos, program.local[13];
ADD TempPos, program.local[8], -TempPos; # vtxpos - lightpos
# normalize light vector
DP3 TempPos.w, TempPos, TempPos;
RSQ TempPos.w, TempPos.w;
MUL TempPos, TempPos, TempPos.w;
# calculate light color
DP3 TempColor, TempNormal, TempPos; # dp3 with negative light vector
LIT OutColor, TempColor; # clamp to zero if r3 < 0, r5 has diffuce component in r5.y
MUL OutColor, TempColor.y, program.local[9]; # ouput diffuse color
MOV OutColor.w, 1.0; # we want alpha to be always 1
MOV OutTexCoord, InTexCoord; # store texture coordinate
MOV OutPos, Temp;
END</pre> </td>
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<td><strong>OPENGL.PSH</strong></td>
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<td> <pre>
!!ARBfp1.0
# part of the Irrlicht Engine Shader example.
# Please note that these example shaders don't do anything really useful.
# They only demonstrate that shaders can be used in Irrlicht.<br>
#Input
ATTRIB inTexCoord = fragment.texcoord; # texture coordinates
ATTRIB inColor = fragment.color.primary; # interpolated diffuse color
#Output
OUTPUT outColor = result.color;
TEMP texelColor;
TEMP tmp;
TXP texelColor, inTexCoord, texture, 2D;
ADD tmp, inColor, inColor; # mulitply with color
MUL texelColor, texelColor, tmp; # mulitply with color
ADD outColor, texelColor, texelColor; # make it brighter and store result
END </pre> </td>
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