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1/** Example 010 Shaders
2
3This tutorial shows how to use shaders for D3D8, D3D9, OpenGL, and Cg with the
4engine and how to create new material types with them. It also shows how to
5disable the generation of mipmaps at texture loading, and how to use text scene
6nodes.
7
8This tutorial does not explain how shaders work. I would recommend to read the
9D3D, OpenGL, or Cg documentation, to search a tutorial, or to read a book about
10this.
11
12At first, we need to include all headers and do the stuff we always do, like in
13nearly all other tutorials:
14*/
15#include <irrlicht.h>
16#include <iostream>
17#include "driverChoice.h"
18
19using namespace irr;
20
21#ifdef _MSC_VER
22#pragma comment(lib, "Irrlicht.lib")
23#endif
24
25/*
26Because we want to use some interesting shaders in this tutorials, we need to
27set some data for them to make them able to compute nice colors. In this
28example, we'll use a simple vertex shader which will calculate the color of the
29vertex based on the position of the camera.
30For this, the shader needs the following data: The inverted world matrix for
31transforming the normal, the clip matrix for transforming the position, the
32camera position and the world position of the object for the calculation of the
33angle of light, and the color of the light. To be able to tell the shader all
34this data every frame, we have to derive a class from the
35IShaderConstantSetCallBack interface and override its only method, namely
36OnSetConstants(). This method will be called every time the material is set.
37The method setVertexShaderConstant() of the IMaterialRendererServices interface
38is used to set the data the shader needs. If the user chose to use a High Level
39shader language like HLSL instead of Assembler in this example, you have to set
40the variable name as parameter instead of the register index.
41*/
42
43IrrlichtDevice* device = 0;
44bool UseHighLevelShaders = false;
45bool UseCgShaders = false;
46
47class MyShaderCallBack : public video::IShaderConstantSetCallBack
48{
49public:
50
51 virtual void OnSetConstants(video::IMaterialRendererServices* services,
52 s32 userData)
53 {
54 video::IVideoDriver* driver = services->getVideoDriver();
55
56 // set inverted world matrix
57 // if we are using highlevel shaders (the user can select this when
58 // starting the program), we must set the constants by name.
59
60 core::matrix4 invWorld = driver->getTransform(video::ETS_WORLD);
61 invWorld.makeInverse();
62
63 if (UseHighLevelShaders)
64 services->setVertexShaderConstant("mInvWorld", invWorld.pointer(), 16);
65 else
66 services->setVertexShaderConstant(invWorld.pointer(), 0, 4);
67
68 // set clip matrix
69
70 core::matrix4 worldViewProj;
71 worldViewProj = driver->getTransform(video::ETS_PROJECTION);
72 worldViewProj *= driver->getTransform(video::ETS_VIEW);
73 worldViewProj *= driver->getTransform(video::ETS_WORLD);
74
75 if (UseHighLevelShaders)
76 services->setVertexShaderConstant("mWorldViewProj", worldViewProj.pointer(), 16);
77 else
78 services->setVertexShaderConstant(worldViewProj.pointer(), 4, 4);
79
80 // set camera position
81
82 core::vector3df pos = device->getSceneManager()->
83 getActiveCamera()->getAbsolutePosition();
84
85 if (UseHighLevelShaders)
86 services->setVertexShaderConstant("mLightPos", reinterpret_cast<f32*>(&pos), 3);
87 else
88 services->setVertexShaderConstant(reinterpret_cast<f32*>(&pos), 8, 1);
89
90 // set light color
91
92 video::SColorf col(0.0f,1.0f,1.0f,0.0f);
93
94 if (UseHighLevelShaders)
95 services->setVertexShaderConstant("mLightColor",
96 reinterpret_cast<f32*>(&col), 4);
97 else
98 services->setVertexShaderConstant(reinterpret_cast<f32*>(&col), 9, 1);
99
100 // set transposed world matrix
101
102 core::matrix4 world = driver->getTransform(video::ETS_WORLD);
103 world = world.getTransposed();
104
105 if (UseHighLevelShaders)
106 {
107 services->setVertexShaderConstant("mTransWorld", world.pointer(), 16);
108
109 // set texture, for textures you can use both an int and a float setPixelShaderConstant interfaces (You need it only for an OpenGL driver).
110 s32 TextureLayerID = 0;
111 if (UseHighLevelShaders)
112 services->setPixelShaderConstant("myTexture", &TextureLayerID, 1);
113 }
114 else
115 services->setVertexShaderConstant(world.pointer(), 10, 4);
116 }
117};
118
119/*
120The next few lines start up the engine just like in most other tutorials
121before. But in addition, we ask the user if he wants to use high level shaders
122in this example, if he selected a driver which is capable of doing so.
123*/
124int main()
125{
126 // ask user for driver
127 video::E_DRIVER_TYPE driverType=driverChoiceConsole();
128 if (driverType==video::EDT_COUNT)
129 return 1;
130
131 // ask the user if we should use high level shaders for this example
132 if (driverType == video::EDT_DIRECT3D9 ||
133 driverType == video::EDT_OPENGL)
134 {
135 char i;
136 printf("Please press 'y' if you want to use high level shaders.\n");
137 std::cin >> i;
138 if (i == 'y')
139 {
140 UseHighLevelShaders = true;
141 printf("Please press 'y' if you want to use Cg shaders.\n");
142 std::cin >> i;
143 if (i == 'y')
144 UseCgShaders = true;
145 }
146 }
147
148 // create device
149 device = createDevice(driverType, core::dimension2d<u32>(640, 480));
150
151 if (device == 0)
152 return 1; // could not create selected driver.
153
154 video::IVideoDriver* driver = device->getVideoDriver();
155 scene::ISceneManager* smgr = device->getSceneManager();
156 gui::IGUIEnvironment* gui = device->getGUIEnvironment();
157
158 // Make sure we don't try Cg without support for it
159 if (UseCgShaders && !driver->queryFeature(video::EVDF_CG))
160 {
161 printf("Warning: No Cg support, disabling.\n");
162 UseCgShaders=false;
163 }
164
165 /*
166 Now for the more interesting parts. If we are using Direct3D, we want
167 to load vertex and pixel shader programs, if we have OpenGL, we want to
168 use ARB fragment and vertex programs. I wrote the corresponding
169 programs down into the files d3d8.ps, d3d8.vs, d3d9.ps, d3d9.vs,
170 opengl.ps and opengl.vs. We only need the right filenames now. This is
171 done in the following switch. Note, that it is not necessary to write
172 the shaders into text files, like in this example. You can even write
173 the shaders directly as strings into the cpp source file, and use later
174 addShaderMaterial() instead of addShaderMaterialFromFiles().
175 */
176
177 io::path vsFileName; // filename for the vertex shader
178 io::path psFileName; // filename for the pixel shader
179
180 switch(driverType)
181 {
182 case video::EDT_DIRECT3D8:
183 psFileName = "../../media/d3d8.psh";
184 vsFileName = "../../media/d3d8.vsh";
185 break;
186 case video::EDT_DIRECT3D9:
187 if (UseHighLevelShaders)
188 {
189 // Cg can also handle this syntax
190 psFileName = "../../media/d3d9.hlsl";
191 vsFileName = psFileName; // both shaders are in the same file
192 }
193 else
194 {
195 psFileName = "../../media/d3d9.psh";
196 vsFileName = "../../media/d3d9.vsh";
197 }
198 break;
199
200 case video::EDT_OPENGL:
201 if (UseHighLevelShaders)
202 {
203 if (!UseCgShaders)
204 {
205 psFileName = "../../media/opengl.frag";
206 vsFileName = "../../media/opengl.vert";
207 }
208 else
209 {
210 // Use HLSL syntax for Cg
211 psFileName = "../../media/d3d9.hlsl";
212 vsFileName = psFileName; // both shaders are in the same file
213 }
214 }
215 else
216 {
217 psFileName = "../../media/opengl.psh";
218 vsFileName = "../../media/opengl.vsh";
219 }
220 break;
221 }
222
223 /*
224 In addition, we check if the hardware and the selected renderer is
225 capable of executing the shaders we want. If not, we simply set the
226 filename string to 0. This is not necessary, but useful in this
227 example: For example, if the hardware is able to execute vertex shaders
228 but not pixel shaders, we create a new material which only uses the
229 vertex shader, and no pixel shader. Otherwise, if we would tell the
230 engine to create this material and the engine sees that the hardware
231 wouldn't be able to fulfill the request completely, it would not
232 create any new material at all. So in this example you would see at
233 least the vertex shader in action, without the pixel shader.
234 */
235
236 if (!driver->queryFeature(video::EVDF_PIXEL_SHADER_1_1) &&
237 !driver->queryFeature(video::EVDF_ARB_FRAGMENT_PROGRAM_1))
238 {
239 device->getLogger()->log("WARNING: Pixel shaders disabled "\
240 "because of missing driver/hardware support.");
241 psFileName = "";
242 }
243
244 if (!driver->queryFeature(video::EVDF_VERTEX_SHADER_1_1) &&
245 !driver->queryFeature(video::EVDF_ARB_VERTEX_PROGRAM_1))
246 {
247 device->getLogger()->log("WARNING: Vertex shaders disabled "\
248 "because of missing driver/hardware support.");
249 vsFileName = "";
250 }
251
252 /*
253 Now lets create the new materials. As you maybe know from previous
254 examples, a material type in the Irrlicht engine is set by simply
255 changing the MaterialType value in the SMaterial struct. And this value
256 is just a simple 32 bit value, like video::EMT_SOLID. So we only need
257 the engine to create a new value for us which we can set there. To do
258 this, we get a pointer to the IGPUProgrammingServices and call
259 addShaderMaterialFromFiles(), which returns such a new 32 bit value.
260 That's all.
261
262 The parameters to this method are the following: First, the names of
263 the files containing the code of the vertex and the pixel shader. If
264 you would use addShaderMaterial() instead, you would not need file
265 names, then you could write the code of the shader directly as string.
266 The following parameter is a pointer to the IShaderConstantSetCallBack
267 class we wrote at the beginning of this tutorial. If you don't want to
268 set constants, set this to 0. The last parameter tells the engine which
269 material it should use as base material.
270
271 To demonstrate this, we create two materials with a different base
272 material, one with EMT_SOLID and one with EMT_TRANSPARENT_ADD_COLOR.
273 */
274
275 // create materials
276
277 video::IGPUProgrammingServices* gpu = driver->getGPUProgrammingServices();
278 s32 newMaterialType1 = 0;
279 s32 newMaterialType2 = 0;
280
281 if (gpu)
282 {
283 MyShaderCallBack* mc = new MyShaderCallBack();
284
285 // create the shaders depending on if the user wanted high level
286 // or low level shaders:
287
288 if (UseHighLevelShaders)
289 {
290 // Choose the desired shader type. Default is the native
291 // shader type for the driver, for Cg pass the special
292 // enum value EGSL_CG
293 const video::E_GPU_SHADING_LANGUAGE shadingLanguage =
294 UseCgShaders ? video::EGSL_CG:video::EGSL_DEFAULT;
295
296 // create material from high level shaders (hlsl, glsl or cg)
297
298 newMaterialType1 = gpu->addHighLevelShaderMaterialFromFiles(
299 vsFileName, "vertexMain", video::EVST_VS_1_1,
300 psFileName, "pixelMain", video::EPST_PS_1_1,
301 mc, video::EMT_SOLID, 0, shadingLanguage);
302
303 newMaterialType2 = gpu->addHighLevelShaderMaterialFromFiles(
304 vsFileName, "vertexMain", video::EVST_VS_1_1,
305 psFileName, "pixelMain", video::EPST_PS_1_1,
306 mc, video::EMT_TRANSPARENT_ADD_COLOR, 0 , shadingLanguage);
307 }
308 else
309 {
310 // create material from low level shaders (asm or arb_asm)
311
312 newMaterialType1 = gpu->addShaderMaterialFromFiles(vsFileName,
313 psFileName, mc, video::EMT_SOLID);
314
315 newMaterialType2 = gpu->addShaderMaterialFromFiles(vsFileName,
316 psFileName, mc, video::EMT_TRANSPARENT_ADD_COLOR);
317 }
318
319 mc->drop();
320 }
321
322 /*
323 Now it's time for testing the materials. We create a test cube and set
324 the material we created. In addition, we add a text scene node to the
325 cube and a rotation animator to make it look more interesting and
326 important.
327 */
328
329 // create test scene node 1, with the new created material type 1
330
331 scene::ISceneNode* node = smgr->addCubeSceneNode(50);
332 node->setPosition(core::vector3df(0,0,0));
333 node->setMaterialTexture(0, driver->getTexture("../../media/wall.bmp"));
334 node->setMaterialFlag(video::EMF_LIGHTING, false);
335 node->setMaterialType((video::E_MATERIAL_TYPE)newMaterialType1);
336
337 smgr->addTextSceneNode(gui->getBuiltInFont(),
338 L"PS & VS & EMT_SOLID",
339 video::SColor(255,255,255,255), node);
340
341 scene::ISceneNodeAnimator* anim = smgr->createRotationAnimator(
342 core::vector3df(0,0.3f,0));
343 node->addAnimator(anim);
344 anim->drop();
345
346 /*
347 Same for the second cube, but with the second material we created.
348 */
349
350 // create test scene node 2, with the new created material type 2
351
352 node = smgr->addCubeSceneNode(50);
353 node->setPosition(core::vector3df(0,-10,50));
354 node->setMaterialTexture(0, driver->getTexture("../../media/wall.bmp"));
355 node->setMaterialFlag(video::EMF_LIGHTING, false);
356 node->setMaterialFlag(video::EMF_BLEND_OPERATION, true);
357 node->setMaterialType((video::E_MATERIAL_TYPE)newMaterialType2);
358
359 smgr->addTextSceneNode(gui->getBuiltInFont(),
360 L"PS & VS & EMT_TRANSPARENT",
361 video::SColor(255,255,255,255), node);
362
363 anim = smgr->createRotationAnimator(core::vector3df(0,0.3f,0));
364 node->addAnimator(anim);
365 anim->drop();
366
367 /*
368 Then we add a third cube without a shader on it, to be able to compare
369 the cubes.
370 */
371
372 // add a scene node with no shader
373
374 node = smgr->addCubeSceneNode(50);
375 node->setPosition(core::vector3df(0,50,25));
376 node->setMaterialTexture(0, driver->getTexture("../../media/wall.bmp"));
377 node->setMaterialFlag(video::EMF_LIGHTING, false);
378 smgr->addTextSceneNode(gui->getBuiltInFont(), L"NO SHADER",
379 video::SColor(255,255,255,255), node);
380
381 /*
382 And last, we add a skybox and a user controlled camera to the scene.
383 For the skybox textures, we disable mipmap generation, because we don't
384 need mipmaps on it.
385 */
386
387 // add a nice skybox
388
389 driver->setTextureCreationFlag(video::ETCF_CREATE_MIP_MAPS, false);
390
391 smgr->addSkyBoxSceneNode(
392 driver->getTexture("../../media/irrlicht2_up.jpg"),
393 driver->getTexture("../../media/irrlicht2_dn.jpg"),
394 driver->getTexture("../../media/irrlicht2_lf.jpg"),
395 driver->getTexture("../../media/irrlicht2_rt.jpg"),
396 driver->getTexture("../../media/irrlicht2_ft.jpg"),
397 driver->getTexture("../../media/irrlicht2_bk.jpg"));
398
399 driver->setTextureCreationFlag(video::ETCF_CREATE_MIP_MAPS, true);
400
401 // add a camera and disable the mouse cursor
402
403 scene::ICameraSceneNode* cam = smgr->addCameraSceneNodeFPS();
404 cam->setPosition(core::vector3df(-100,50,100));
405 cam->setTarget(core::vector3df(0,0,0));
406 device->getCursorControl()->setVisible(false);
407
408 /*
409 Now draw everything. That's all.
410 */
411
412 int lastFPS = -1;
413
414 while(device->run())
415 if (device->isWindowActive())
416 {
417 driver->beginScene(true, true, video::SColor(255,0,0,0));
418 smgr->drawAll();
419 driver->endScene();
420
421 int fps = driver->getFPS();
422
423 if (lastFPS != fps)
424 {
425 core::stringw str = L"Irrlicht Engine - Vertex and pixel shader example [";
426 str += driver->getName();
427 str += "] FPS:";
428 str += fps;
429
430 device->setWindowCaption(str.c_str());
431 lastFPS = fps;
432 }
433 }
434
435 device->drop();
436
437 return 0;
438}
439
440/*
441Compile and run this, and I hope you have fun with your new little shader
442writing tool :).
443**/
generated by cgit v1.1 at 2024-05-15 18:13:07 +0000