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authorDavid Walter Seikel2016-03-28 22:28:34 +1000
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1<html>
2<head>
3<title>Irrlicht Engine Tutorial</title>
4<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
5</head>
6
7<body bgcolor="#FFFFFF" leftmargin="0" topmargin="0" marginwidth="0" marginheight="0">
8<br>
9<table width="95%" border="0" cellspacing="0" cellpadding="2" align="center">
10 <tr>
11 <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>
12 <td bgcolor="#666699" width="100%">
13<div align="center">
14 <div align="left"><b><font color="#FFFFFF">Tutorial 10. Shaders</font></b></div>
15 </div>
16 </td>
17 </tr>
18 <tr bgcolor="#eeeeff">
19 <td height="90" colspan="2">
20 <div align="left">
21 <p> This tutorial shows how to use shaders for D3D8, D3D9 and OpenGL with
22 the engine and how to create new material types with them. It also shows
23 how to disable the generation of mipmaps at texture loading, and how
24 to use text scene nodes.</p>
25 <p>This tutorial does not explain how shaders work. I would recommend
26 to read the D3D or OpenGL documentation, to search a tutorial, or to
27 read a book about this.</p>
28 <p>The program which is described here will look like this:</p>
29 <p align="center"><img src="../../media/010shot.jpg" width="260" height="203"><br>
30 </p>
31 </div>
32 </td>
33 </tr>
34</table>
35<br>
36<table width="95%" border="0" cellspacing="0" cellpadding="2" align="center">
37 <tr>
38 <td bgcolor="#666699"> <b><font color="#FFFFFF">Lets start!</font></b></td>
39 </tr>
40 <tr>
41 <td height="90" bgcolor="#eeeeff" valign="top"> <div align="left">
42 <div align="left">
43 <p>At first, we need to include all headers and do the stuff we always
44 do, like in nearly all other tutorials:</p>
45 <table width="95%" border="0" cellspacing="2" cellpadding="0" bgcolor="#CCCCCC" align="center">
46 <tr>
47 <td> <pre>#include &lt;irrlicht.h&gt;<br>#include &lt;iostream&gt;<br><br>using namespace irr;<br><br>#pragma comment(lib, &quot;Irrlicht.lib&quot;)<br></pre></td>
48 </tr>
49 </table>
50 <p>Because we want to use some interesting shaders in this tutorials,
51 we need to set some data for them to make them able to compute nice
52 colors. In this example, we'll use a simple vertex shader which will
53 calculate the color of the vertex based on the position of the camera.
54 For this, the shader needs the following data: The inverted world
55 matrix for transforming the normal, the clip matrix for transforming
56 the position, the camera position and the world position of the object
57 for the calculation of the angle of light, and the color of the light.
58 To be able to tell the shader all this data every frame, we have to
59 derive a class from the IShaderConstantSetCallBack interface and override
60 its only method, namely OnSetConstants(). This method will be called
61 every time the material is set. <br>
62 The method setVertexShaderConstant() of the IMaterialRendererServices
63 interface is used to set the data the shader needs. If the user chose
64 to use a High Level shader language like HLSL instead of Assembler
65 in this example, you have to set the variable name as parameter instead
66 of the register index.</p>
67 <table width="95%" border="0" cellspacing="2" cellpadding="0" bgcolor="#CCCCCC" align="center">
68 <tr>
69 <td> <pre>IrrlichtDevice* device = 0;<br>bool UseHighLevelShaders = false;<br><br>class MyShaderCallBack : public video::IShaderConstantSetCallBack<br>{<br>public:
70<br> virtual void OnSetConstants(video::IMaterialRendererServices* services, s32 userData)<br> {<br> video::IVideoDriver* driver = services-&gt;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-&gt;getTransform(video::ETS_WORLD);<br> invWorld.makeInverse();<br><br> if (UseHighLevelShaders)<br> services-&gt;setVertexShaderConstant(&quot;mInvWorld&quot;, &amp;invWorld.M[0], 16);<br> else<br> services-&gt;setVertexShaderConstant(&amp;invWorld.M[0], 0, 4);<br><font color="#006600"><br> // set clip matrix<br></font> core::matrix4 worldViewProj;<br> worldViewProj = driver-&gt;getTransform(video::ETS_PROJECTION); <br> worldViewProj *= driver-&gt;getTransform(video::ETS_VIEW);<br> worldViewProj *= driver-&gt;getTransform(video::ETS_WORLD);<br><br> if (UseHighLevelShaders)<br> services-&gt;setVertexShaderConstant(&quot;mWorldViewProj&quot;, &amp;worldViewProj.M[0], 16);<br> else<br> services-&gt;setVertexShaderConstant(&amp;worldViewProj.M[0], 4, 4);<br> <br><font color="#006600"> </font><font color="#006600">// set camera position<br></font> core::vector3df pos = device-&gt;getSceneManager()-&gt;<br> getActiveCamera()-&gt;getAbsolutePosition();<br><br> if (UseHighLevelShaders)<br> services-&gt;setVertexShaderConstant(&quot;mLightPos&quot;, reinterpret_cast&lt;f32*&gt;(&amp;pos), 3);<br> else<br> services-&gt;setVertexShaderConstant(reinterpret_cast&lt;f32*&gt;(&amp;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-&gt;setVertexShaderConstant(&quot;mLightColor&quot;, reinterpret_cast&lt;f32*&gt;(&amp;col), 4);<br> else<br> services-&gt;setVertexShaderConstant(reinterpret_cast&lt;f32*&gt;(&amp;col), 9, 1);<br><br><font color="#006600"> </font><font color="#006600">// set transposed world matrix<br></font> core::matrix4 world = driver-&gt;getTransform(video::ETS_WORLD);<br> world = world.getTransposed();<br><br> if (UseHighLevelShaders)<br> services-&gt;setVertexShaderConstant(&quot;mTransWorld&quot;, &amp;world.M[0], 16);<br> else<br> services-&gt;setVertexShaderConstant(&amp;world.M[0], 10, 4);<br> }<br>};</pre></td>
71 </tr>
72 </table>
73 <p> The next few lines start up the engine. Just like in most other
74 tutorials before. But in addition, we ask the user if he wants this
75 example to use high level shaders if he selected a driver which is
76 capable of doing so.</p>
77 <table width="95%" border="0" cellspacing="2" cellpadding="0" bgcolor="#CCCCCC" align="center">
78 <tr>
79 <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(&quot;Please select the driver you want for this example:\n&quot;\<br> &quot; (a) Direct3D 9.0c\n (b) Direct3D 8.1\n (c) OpenGL 1.5\n&quot;\<br> &quot; (d) Software Renderer\n (e) Apfelbaum Software Renderer\n&quot;\<br> &quot; (f) NullDevice\n (otherKey) exit\n\n&quot;);<br><br> char i;<br> std::cin &gt;&gt; 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)
80 {<br> printf(&quot;<font color="#CC0000">Please press 'y' if you want to use high level shaders.\n</font>&quot;);<br> std::cin &gt;&gt; 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&lt;s32&gt;(640, 480));<br><br> if (device == 0)<br> {<br> printf(<font color="#CC0000">&quot;\nWas not able to create driver.\n&quot;\<br> &quot;Please restart and select another driver.\n&quot;</font>);<br> getch();<br> return 1;<br> } <br><br> video::IVideoDriver* driver = device-&gt;getVideoDriver();<br> scene::ISceneManager* smgr = device-&gt;getSceneManager();<br> gui::IGUIEnvironment* gui = device-&gt;getGUIEnvironment();</pre></td>
81 </tr>
82 </table>
83 <p> Now for the more interesting parts. If we are using Direct3D, we
84 want to load vertex and pixel shader programs, if we have<br>
85 OpenGL, we want to use ARB fragment and vertex programs. I wrote the
86 corresponding programs down into the files d3d8.ps, d3d8.vs, d3d9.ps,
87 d3d9.vs, opengl.ps and opengl.vs. We only need the right filenames
88 now. This is done in the following switch. Note, that it is not necessary
89 to write the shaders into text files, like in this example. You can
90 even write the shaders directly as strings into the cpp source file,
91 and use later addShaderMaterial() instead of addShaderMaterialFromFiles().</p>
92 <table width="95%" border="0" cellspacing="2" cellpadding="0" bgcolor="#CCCCCC" align="center">
93 <tr>
94 <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 = &quot;../../media/d3d8.psh&quot;;<br> vsFileName = &quot;../../media/d3d8.vsh&quot;;<br> break;<br> case video::EDT_DIRECT3D9:<br> if (UseHighLevelShaders)<br> {<br> psFileName = &quot;../../media/d3d9.hlsl&quot;;<br> vsFileName = psFileName; <font color="#006600">// both shaders are in the same file</font><br> }<br> else<br> {<br> psFileName = &quot;../../media/d3d9.psh&quot;;<br> vsFileName = &quot;../../media/d3d9.vsh&quot;;<br> }<br> break;<br> case video::EDT_OPENGL:<br> if (UseHighLevelShaders)<br> {<br> psFileName = &quot;../../media/opengl.frag&quot;;<br> vsFileName = &quot;../../media/opengl.vert&quot;;<br> }<br> else<br> {<br> psFileName = &quot;../../media/opengl.psh&quot;;<br> vsFileName = &quot;../../media/opengl.vsh&quot;;<br> }<br> break;<br> }<br></pre>
95 </td>
96 </tr>
97 </table>
98 <p> In addition, we check if the hardware and the selected renderer
99 is capable of executing the shaders we want. If not, we simply set
100 the filename string to 0. This is not necessary, but useful in this
101 example: For example, if the hardware is able to execute vertex shaders
102 but not pixel shaders, we create a new material which only uses the
103 vertex shader, and no pixel shader. Otherwise, if we would tell the
104 engine to create this material and the engine sees that the hardware
105 wouldn't be able to fullfill the request completely,<br>
106 it would not create any new material at all. So in this example you
107 would see at least the vertex shader in action, without the pixel
108 shader.</p>
109 </div>
110 <table width="95%" border="0" cellspacing="2" cellpadding="0" bgcolor="#CCCCCC" align="center">
111 <tr>
112 <td> <pre> if (!driver-&gt;queryFeature(video::EVDF_PIXEL_SHADER_1_1) &amp;&amp;<br> !driver-&gt;queryFeature(video::EVDF_ARB_FRAGMENT_PROGRAM_1))<br> {<br> device-&gt;getLogger()-&gt;log(&quot;WARNING: Pixel shaders disabled &quot;\<br> &quot;because of missing driver/hardware support.&quot;);<br> psFileName = 0;<br> }<br> <br> if (!driver-&gt;queryFeature(video::EVDF_VERTEX_SHADER_1_1) &amp;&amp;<br> !driver-&gt;queryFeature(video::EVDF_ARB_VERTEX_PROGRAM_1))<br> {<br> device-&gt;getLogger()-&gt;log(&quot;WARNING: Vertex shaders disabled &quot;\<br> &quot;because of missing driver/hardware support.&quot;);<br> vsFileName = 0;<br> }</pre></td>
113 </tr>
114 </table>
115 <p> Now lets create the new materials.<br>
116 As you maybe know from previous examples, a material type in the Irrlicht
117 engine is set by simply changing the MaterialType value in the SMaterial
118 struct. And this value is just a simple 32 bit value, like video::EMT_SOLID.
119 So we only need the engine to create a new value for us which we can
120 set there. To do this, we get a pointer to the IGPUProgrammingServices
121 and call addShaderMaterialFromFiles(), which returns such a new 32 bit
122 value. That's all.<br>
123 The parameters to this method are the following: First, the names of
124 the files containing the code of the vertex and the pixel shader.<br>
125 If you would use addShaderMaterial() instead, you would not need file
126 names, then you could write the code of the shader directly as string.
127 The following parameter is a pointer to the IShaderConstantSetCallBack
128 class we wrote at the beginning of this tutorial. If you don't want
129 to set constants, set this to 0. The last paramter tells the engine
130 which material it should use as base material. <br>
131 To demonstrate this, we create two materials with a different base material,
132 one with EMT_SOLID and one with EMT_TRANSPARENT_ADD_COLOR.</p>
133 <table width="95%" border="0" cellspacing="2" cellpadding="0" bgcolor="#CCCCCC" align="center">
134 <tr>
135 <td><pre> <font color="#006600">// create materials</font><br><br> video::IGPUProgrammingServices* gpu = driver-&gt;getGPUProgrammingServices();<br><br> s32 newMaterialType1 = 0;<br> s32 newMaterialType2 = 0;<br><br> if (gpu)<br> {<br> MyShaderCallBack* mc = new MyShaderCallBack();<br> <font color="#006600">
136 // 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-&gt;addHighLevelShaderMaterialFromFiles(<br> vsFileName, &quot;vertexMain&quot;, video::EVST_VS_1_1,<br> psFileName, &quot;pixelMain&quot;, video::EPST_PS_1_1,<br> mc, video::EMT_SOLID);<br><br> newMaterialType2 = gpu-&gt;addHighLevelShaderMaterialFromFiles(<br> vsFileName, &quot;vertexMain&quot;, video::EVST_VS_1_1,<br> psFileName, &quot;pixelMain&quot;, 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-&gt;addShaderMaterialFromFiles(vsFileName,<br> psFileName, mc, video::EMT_SOLID);<br><br> newMaterialType2 = gpu-&gt;addShaderMaterialFromFiles(vsFileName,<br> psFileName, mc, video::EMT_TRANSPARENT_ADD_COLOR);<br> }<br><br> mc-&gt;drop();<br> }<br></pre></td>
137 </tr>
138 </table>
139 <p> Now its time for testing out the materials. We create a test cube
140 and set the material we created. In addition, we add a text scene node
141 to the cube and a rotatation animator, to make it look more interesting
142 and important. </p>
143 <table width="95%" border="0" cellspacing="2" cellpadding="0" bgcolor="#CCCCCC" align="center">
144 <tr>
145 <td><pre><font color="#006600">
146 // create test scene node 1, with the new created material type 1</font>
147
148 scene::ISceneNode* node = smgr-&gt;addCubeSceneNode(50);
149 node-&gt;setPosition(core::vector3df(0,0,0));
150 node-&gt;setMaterialTexture(0, driver-&gt;getTexture(&quot;../../media/wall.bmp&quot;));
151 node-&gt;setMaterialFlag(video::EMF_LIGHTING, false);
152 node-&gt;setMaterialType((video::E_MATERIAL_TYPE)newMaterialType1);
153
154 smgr-&gt;addTextSceneNode(gui-&gt;getBuiltInFont(),
155 L&quot;PS &amp; VS &amp; EMT_SOLID&quot;,
156 video::SColor(255,255,255,255), node);
157
158 scene::ISceneNodeAnimator* anim = smgr-&gt;createRotationAnimator(
159 core::vector3df(0,0.3f,0));
160 node-&gt;addAnimator(anim);
161 anim-&gt;drop();</pre></td>
162 </tr>
163 </table>
164 <p> Same for the second cube, but with the second material we created.</p>
165 <table width="95%" border="0" cellspacing="2" cellpadding="0" bgcolor="#CCCCCC" align="center">
166 <tr>
167 <td><pre> <font color="#006600">// create test scene node 2, with the new created material type 2</font>
168
169 node = smgr-&gt;addCubeSceneNode(50);
170 node-&gt;setPosition(core::vector3df(0,-10,50));
171 node-&gt;setMaterialTexture(0, driver-&gt;getTexture(&quot;../../media/wall.bmp&quot;));
172 node-&gt;setMaterialFlag(video::EMF_LIGHTING, false);
173 node-&gt;setMaterialType((video::E_MATERIAL_TYPE)newMaterialType2);
174
175 smgr-&gt;addTextSceneNode(gui-&gt;getBuiltInFont(),
176 L&quot;PS &amp; VS &amp; EMT_TRANSPARENT&quot;,
177 video::SColor(255,255,255,255), node);
178
179 anim = smgr-&gt;createRotationAnimator(core::vector3df(0,0.3f,0));
180 node-&gt;addAnimator(anim);
181 anim-&gt;drop();</pre></td>
182 </tr>
183 </table>
184 <br>
185 Then we add a third cube without a shader on it, to be able to compare
186 the cubes.<br>
187 <br>
188 <table width="95%" border="0" cellspacing="2" cellpadding="0" bgcolor="#CCCCCC" align="center">
189 <tr>
190 <td><pre> <font color="#006600">// add a scene node with no shader </font>
191
192 node = smgr-&gt;addCubeSceneNode(50);
193 node-&gt;setPosition(core::vector3df(0,50,25));
194 node-&gt;setMaterialTexture(0, driver-&gt;getTexture(&quot;../../media/wall.bmp&quot;));
195 node-&gt;setMaterialFlag(video::EMF_LIGHTING, false);
196 smgr-&gt;addTextSceneNode(gui-&gt;getBuiltInFont(), L&quot;NO SHADER&quot;,
197 video::SColor(255,255,255,255), node);
198 </pre></td>
199 </tr>
200 </table>
201 <br>
202 And last, we add a skybox and a user controlled camera to the scene. For
203 the skybox textures, we disable mipmap generation, because we don't need
204 mipmaps on it.<br>
205 <br>
206 <table width="95%" border="0" cellspacing="2" cellpadding="0" bgcolor="#CCCCCC" align="center">
207 <tr>
208 <td><pre> <font color="#006600">// add a nice skybox</font><br><br> driver-&gt;setTextureCreationFlag(video::ETCF_CREATE_MIP_MAPS, false);<br><br> smgr-&gt;addSkyBoxSceneNode(<br> driver-&gt;getTexture(&quot;../../media/irrlicht2_up.jpg&quot;),<br> driver-&gt;getTexture(&quot;../../media/irrlicht2_dn.jpg&quot;),<br> driver-&gt;getTexture(&quot;../../media/irrlicht2_lf.jpg&quot;),<br> driver-&gt;getTexture(&quot;../../media/irrlicht2_rt.jpg&quot;),<br> driver-&gt;getTexture(&quot;../../media/irrlicht2_ft.jpg&quot;),<br> driver-&gt;getTexture(&quot;../../media/irrlicht2_bk.jpg&quot;));<br><br> driver-&gt;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-&gt;addCameraSceneNodeFPS(0, 100.0f, 100.0f);<br> cam-&gt;setPosition(core::vector3df(-100,50,100));<br> cam-&gt;setTarget(core::vector3df(0,0,0));<br> device-&gt;getCursorControl()-&gt;setVisible(false);</pre></td>
209 </tr>
210 </table>
211 <br>
212 Now draw everything. That's all.<br>
213 <br>
214 <table width="95%" border="0" cellspacing="2" cellpadding="0" bgcolor="#CCCCCC" align="center">
215 <tr>
216 <td><pre> int lastFPS = -1;<br><br> while(device-&gt;run())<br> if (device-&gt;isWindowActive())<br> {<br> driver-&gt;beginScene(true, true, video::SColor(255,0,0,0));<br> smgr-&gt;drawAll();<br> driver-&gt;endScene();<br><br> int fps = driver-&gt;getFPS();<br><br> if (lastFPS != fps)<br> {<br> core::stringw str = L&quot;Irrlicht Engine - Vertex and pixel shader example [&quot;;<br> str += driver-&gt;getName();<br> str += &quot;] FPS:&quot;;<br> str += fps;<br> device-&gt;setWindowCaption(str.c_str());<br> lastFPS = fps;<br> }<br> }<br><br> device-&gt;drop();<br> <br> return 0;<br></pre></td>
217 </tr>
218 </table>
219 <br>
220 Compile and run this, and I hope you have fun with your new little shader
221 writing tool :).<br>
222 </div>
223 </td>
224 </tr>
225</table>
226<br>
227<table width="95%" border="0" cellspacing="0" cellpadding="2" align="center">
228 <tr>
229 <td bgcolor="#666699"> <b><font color="#FFFFFF">Shader files</font></b></td>
230 </tr>
231 <tr>
232 <td height="90" bgcolor="#eeeeff" valign="top"> <div align="left">
233 <div align="left">
234 <p>The files containing the shaders can be found in the media directory
235 of the SDK. However, they look like this:</p>
236 <table width="95%" border="0" cellspacing="4" cellpadding="0" bgcolor="#CCCCCC" align="center">
237 <tr>
238 <td><strong>D3D9.HLSL</strong></td>
239 </tr>
240 <tr>
241 <td>
242<pre>
243// part of the Irrlicht Engine Shader example.
244// These simple Direct3D9 pixel and vertex shaders will be loaded by the shaders
245// example. Please note that these example shaders don't do anything really useful.
246// They only demonstrate that shaders can be used in Irrlicht.
247
248//-----------------------------------------------------------------------------
249// Global variables
250//-----------------------------------------------------------------------------
251float4x4 mWorldViewProj; // World * View * Projection transformation
252float4x4 mInvWorld; // Inverted world matrix
253float4x4 mTransWorld; // Transposed world matrix
254float3 mLightPos; // Light position
255float4 mLightColor; // Light color
256
257
258// Vertex shader output structure
259struct VS_OUTPUT
260{
261 float4 Position : POSITION; // vertex position
262 float4 Diffuse : COLOR0; // vertex diffuse color
263 float2 TexCoord : TEXCOORD0; // tex coords
264};
265
266
267VS_OUTPUT vertexMain( in float4 vPosition : POSITION,
268 in float3 vNormal : NORMAL,
269 float2 texCoord : TEXCOORD0 )
270{
271 VS_OUTPUT Output;
272
273 // transform position to clip space
274 Output.Position = mul(vPosition, mWorldViewProj);
275
276 // transform normal
277 float3 normal = mul(vNormal, mInvWorld);
278
279 // renormalize normal
280 normal = normalize(normal);
281
282 // position in world coodinates
283 float3 worldpos = mul(mTransWorld, vPosition);
284
285 // calculate light vector, vtxpos - lightpos
286 float3 lightVector = worldpos - mLightPos;
287
288 // normalize light vector
289 lightVector = normalize(lightVector);
290
291 // calculate light color
292 float3 tmp = dot(-lightVector, normal);
293 tmp = lit(tmp.x, tmp.y, 1.0);
294
295 tmp = mLightColor * tmp.y;
296 Output.Diffuse = float4(tmp.x, tmp.y, tmp.z, 0);
297 Output.TexCoord = texCoord;
298
299 return Output;
300}
301
302
303
304// Pixel shader output structure
305struct PS_OUTPUT
306{
307 float4 RGBColor : COLOR0; // Pixel color
308};
309
310
311sampler2D tex0;
312
313PS_OUTPUT pixelMain( float2 TexCoord : TEXCOORD0,
314 float4 Position : POSITION,
315 float4 Diffuse : COLOR0 )
316{
317 PS_OUTPUT Output;
318
319 float4 col = tex2D( tex0, TexCoord ); // sample color map
320
321 // multiply with diffuse and do other senseless operations
322 Output.RGBColor = Diffuse * col;
323 Output.RGBColor *= 4.0;
324
325 return Output;
326}</pre></td>
327 </tr>
328 </table>
329 <br>
330 <table width="95%" border="0" cellspacing="4" cellpadding="0" bgcolor="#CCCCCC" align="center">
331 <tr>
332 <td><strong>D3D9.VSH</strong></td>
333 </tr>
334 <tr>
335 <td> <pre>
336; part of the Irrlicht Engine Shader example.
337; This Direct3D9 vertex shader will be loaded by the engine.
338; Please note that these example shaders don't do anything really useful.
339; They only demonstrate that shaders can be used in Irrlicht.<br>
340vs.1.1
341
342dcl_position v0; ; declare position
343dcl_normal v1; ; declare normal
344dcl_color v2; ; declare color
345dcl_texcoord0 v3; ; declare texture coordinate<br>
346; transpose and transform position to clip space
347mul r0, v0.x, c4
348mad r0, v0.y, c5, r0
349mad r0, v0.z, c6, r0
350add oPos, c7, r0
351
352; transform normal
353dp3 r1.x, v1, c0
354dp3 r1.y, v1, c1
355dp3 r1.z, v1, c2
356
357; renormalize normal
358dp3 r1.w, r1, r1
359rsq r1.w, r1.w
360mul r1, r1, r1.w
361
362; calculate light vector
363m4x4 r6, v0, c10 ; vertex into world position
364add r2, c8, -r6 ; vtxpos - lightpos
365
366; normalize light vector
367dp3 r2.w, r2, r2
368rsq r2.w, r2.w
369mul r2, r2, r2.w
370
371; calculate light color
372dp3 r3, r1, r2 ; dp3 with negative light vector
373lit r5, r3 ; clamp to zero if r3 < 0, r5 has diffuce component in r5.y
374mul oD0, r5.y, c9 ; ouput diffuse color
375mov oT0, v3 ; store texture coordinates </pre> </td>
376 </tr>
377 </table>
378 <br>
379 <table width="95%" border="0" cellspacing="4" cellpadding="0" bgcolor="#CCCCCC" align="center">
380 <tr>
381 <td><strong>D3D9.PSH</strong></td>
382 </tr>
383 <tr>
384 <td> <pre>
385; part of the Irrlicht Engine Shader example.
386; This simple Direct3D9 pixel shader will be loaded by the engine.
387; Please note that these example shaders don't do anything really useful.
388; They only demonstrate that shaders can be used in Irrlicht.<br>
389ps.1.1
390
391tex t0 ; sample color map
392add r0, v0, v0 ; mulitply with color
393mul t0, t0, r0 ; mulitply with color
394add r0, t0, t0 ; make it brighter and store result
395 </pre> </td>
396 </tr>
397 </table>
398 <br>
399 <table width="95%" border="0" cellspacing="4" cellpadding="0" bgcolor="#CCCCCC" align="center">
400 <tr>
401 <td><strong>D3D8.VSH</strong></td>
402 </tr>
403 <tr>
404 <td> <pre>
405; part of the Irrlicht Engine Shader example.
406; This Direct3D9 vertex shader will be loaded by the engine.
407; Please note that these example shaders don't do anything really useful.
408; They only demonstrate that shaders can be used in Irrlicht.<br>
409vs.1.1
410
411; transpose and transform position to clip space
412mul r0, v0.x, c4
413mad r0, v0.y, c5, r0
414mad r0, v0.z, c6, r0
415add oPos, c7, r0
416
417; transform normal
418dp3 r1.x, v1, c0
419dp3 r1.y, v1, c1
420dp3 r1.z, v1, c2
421
422; renormalize normal
423dp3 r1.w, r1, r1
424rsq r1.w, r1.w
425mul r1, r1, r1.w
426
427; calculate light vector
428m4x4 r6, v0, c10 ; vertex into world position
429add r2, c8, -r6 ; vtxpos - lightpos
430
431; normalize light vector
432dp3 r2.w, r2, r2
433rsq r2.w, r2.w
434mul r2, r2, r2.w
435
436; calculate light color
437dp3 r3, r1, r2 ; dp3 with negative light vector
438lit r5, r3 ; clamp to zero if r3 < 0, r5 has diffuce component in r5.y
439mul oD0, r5.y, c9 ; ouput diffuse color
440mov oT0, v3 ; store texture coordinates </pre> </td>
441 </tr>
442 </table>
443 <br>
444 <table width="95%" border="0" cellspacing="4" cellpadding="0" bgcolor="#CCCCCC" align="center">
445 <tr>
446 <td><strong>D3D8.PSH</strong></td>
447 </tr>
448 <tr>
449 <td> <pre>
450; part of the Irrlicht Engine Shader example.
451; This simple Direct3D9 pixel shader will be loaded by the engine.
452; Please note that these example shaders don't do anything really useful.
453; They only demonstrate that shaders can be used in Irrlicht.<br>
454ps.1.1
455
456tex t0 ; sample color map
457mul_x2 t0, t0, v0 ; mulitply with color
458add r0, t0, t0 ; make it brighter and store result </pre> </td>
459 </tr>
460 </table>
461 <br>
462 <table width="95%" border="0" cellspacing="4" cellpadding="0" bgcolor="#CCCCCC" align="center">
463 <tr>
464 <td><strong>OPENGL.VSH</strong></td>
465 </tr>
466 <tr>
467 <td> <pre>
468!!ARBvp1.0
469# part of the Irrlicht Engine Shader example.
470# Please note that these example shaders don't do anything really useful.
471# They only demonstrate that shaders can be used in Irrlicht.<br>
472#input
473ATTRIB InPos = vertex.position;
474ATTRIB InColor = vertex.color;
475ATTRIB InNormal = vertex.normal;
476ATTRIB InTexCoord = vertex.texcoord;
477
478#output
479OUTPUT OutPos = result.position;
480OUTPUT OutColor = result.color;
481OUTPUT OutTexCoord = result.texcoord;
482
483PARAM MVP[4] = { state.matrix.mvp }; # modelViewProjection matrix.
484TEMP Temp;
485TEMP TempColor;
486TEMP TempNormal;
487TEMP TempPos;
488
489#transform position to clip space
490DP4 Temp.x, MVP[0], InPos;
491DP4 Temp.y, MVP[1], InPos;
492DP4 Temp.z, MVP[2], InPos;
493DP4 Temp.w, MVP[3], InPos;
494
495#transform normal
496DP3 TempNormal.x, InNormal.x, program.local[0];
497DP3 TempNormal.y, InNormal.y, program.local[1];
498DP3 TempNormal.z, InNormal.z, program.local[2];
499
500#renormalize normal
501DP3 TempNormal.w, TempNormal, TempNormal;
502RSQ TempNormal.w, TempNormal.w;
503MUL TempNormal, TempNormal, TempNormal.w;
504
505# calculate light vector
506DP4 TempPos.x, InPos, program.local[10]; # vertex into world position
507DP4 TempPos.y, InPos, program.local[11];
508DP4 TempPos.z, InPos, program.local[12];
509DP4 TempPos.w, InPos, program.local[13];
510
511ADD TempPos, program.local[8], -TempPos; # vtxpos - lightpos
512
513# normalize light vector
514DP3 TempPos.w, TempPos, TempPos;
515RSQ TempPos.w, TempPos.w;
516MUL TempPos, TempPos, TempPos.w;
517
518# calculate light color
519DP3 TempColor, TempNormal, TempPos; # dp3 with negative light vector
520LIT OutColor, TempColor; # clamp to zero if r3 < 0, r5 has diffuce component in r5.y
521MUL OutColor, TempColor.y, program.local[9]; # ouput diffuse color
522MOV OutColor.w, 1.0; # we want alpha to be always 1
523MOV OutTexCoord, InTexCoord; # store texture coordinate
524MOV OutPos, Temp;
525
526END</pre> </td>
527 </tr>
528 </table>
529 <br>
530 <table width="95%" border="0" cellspacing="4" cellpadding="0" bgcolor="#CCCCCC" align="center">
531 <tr>
532 <td><strong>OPENGL.PSH</strong></td>
533 </tr>
534 <tr>
535 <td> <pre>
536!!ARBfp1.0
537# part of the Irrlicht Engine Shader example.
538# Please note that these example shaders don't do anything really useful.
539# They only demonstrate that shaders can be used in Irrlicht.<br>
540#Input
541ATTRIB inTexCoord = fragment.texcoord; # texture coordinates
542ATTRIB inColor = fragment.color.primary; # interpolated diffuse color
543
544#Output
545OUTPUT outColor = result.color;
546
547TEMP texelColor;
548TEMP tmp;
549TXP texelColor, inTexCoord, texture, 2D;
550
551ADD tmp, inColor, inColor; # mulitply with color
552MUL texelColor, texelColor, tmp; # mulitply with color
553ADD outColor, texelColor, texelColor; # make it brighter and store result
554
555END </pre> </td>
556 </tr>
557 </table>
558 <p>&nbsp; </p>
559 </div>
560 </div></td>
561 </tr>
562</table>
563<p>&nbsp;</p>
564<p>&nbsp;</p>
565 </body>
566</html>
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