irrlicht渲染紋理加着色器得到一個錯誤的場景

Question

我已經瞭解了irrlicht教程10（關於着色器）和教程13（關於渲染到紋理）。 但是，當我使用「渲染到紋理」來產生紋理，並將其用於一個立方體，然後着色它時，紋理會顛倒。 你能告訴我我的代碼有什麼問題嗎？如何糾正這一點。

有我的代碼：

#include <irrlicht.h> 

using namespace irr; 

#ifdef _MSC_VER 
#pragma comment(lib, "Irrlicht.lib") 
#endif 

IrrlichtDevice * device = 0; 
////////////////////////////////////////////// 
#define ADD_CUBE 
#define ADD_CAMERA 
#define ADD_RTT 
#define ADD_SCAT 
#ifdef ADD_SCAT 
class MyShaderCallBack : public video::IShaderConstantSetCallBack 
{ 
public: 

    virtual void OnSetConstants(video::IMaterialRendererServices* services, 
      s32 userData) 
    { 
     video::IVideoDriver* driver = services->getVideoDriver(); 

     core::matrix4 proj = driver->getTransform(video::ETS_PROJECTION); 
     core::matrix4 view = driver->getTransform(video::ETS_VIEW); 
     core::matrix4 world = driver->getTransform(video::ETS_WORLD); 

     core::matrix4 mvp = proj * view * world; 

     services->setVertexShaderConstant("mWorldViewProj", mvp.pointer(), 16); 
     s32 TextureLayerID = 0; 
     services->setPixelShaderConstant("textureUnit0", &TextureLayerID, 1); 
    } 
}; 
#endif 

int main() 
{ 
    video::E_DRIVER_TYPE driverType = video::EDT_OPENGL; 
    u32 shadowDimen = 512; 

    device = createDevice(driverType, core::dimension2d<u32>(800, 400), 32); 

    scene::ISceneManager * smgr = device->getSceneManager(); 
    video::IVideoDriver * driver = device->getVideoDriver(); 


    //////////////////////////////////////////////////////////////// 
#ifdef ADD_RTT 
    video::ITexture * rt = 0; 
    if(driver->queryFeature(video::EVDF_RENDER_TO_TARGET)){ 
     rt = driver->addRenderTargetTexture(core::dimension2d<u32>(512,512), "RTT1"); 
    } 
#endif 
#ifdef ADD_CUBE 
    scene::IMeshSceneNode * cubeNode = smgr->addCubeSceneNode(30, 0, -1, 
     core::vector3df(0.0, 0.0, 0.0), core::vector3df(0.0, 0.0, 0.0), core::vector3df(4.0, 2.0, 1.0)); 
    cubeNode->setMaterialFlag(video::EMF_LIGHTING, false); 
    cubeNode->setMaterialTexture(0, driver->getTexture("../media/floor.jpg")); 
#ifdef ADD_RTT 
    scene::IMeshSceneNode * cubeNode2 = smgr->addCubeSceneNode(30, 0, -1, 
     core::vector3df(0.0, 0.0, 0.0), core::vector3df(0.0, 0.0, 0.0), core::vector3df(4.0, 2.0, 1.0)); 
    cubeNode2->setPosition(core::vector3df(0.0, 10.0, 0.0)); 
    cubeNode2->setMaterialFlag(video::EMF_LIGHTING, false); 
    cubeNode2->setMaterialTexture(0, rt); 
#endif 

#endif 
#ifdef ADD_SCAT 
    io::path vsFileName = "../media/opengl.vert"; 
    io::path psFileName = "../media/opengl.frag"; 
    video::IGPUProgrammingServices* gpu = driver->getGPUProgrammingServices(); 
    s32 newMaterialType1 = 0; 
    if(gpu){ 
     MyShaderCallBack * mc = new MyShaderCallBack(); 
     newMaterialType1 = gpu->addHighLevelShaderMaterialFromFiles(
      vsFileName, "vertexMain", video::EVST_VS_1_1, 
      psFileName, "pixelMain", video::EPST_PS_1_1, 
      mc, video::EMT_SOLID, 0, video::EGSL_DEFAULT); 
    } 
    cubeNode2->setMaterialType((video::E_MATERIAL_TYPE)newMaterialType1); 
#endif 
#ifdef ADD_CAMERA 
    scene::ICameraSceneNode * camFPS = smgr->addCameraSceneNodeFPS(); 
    camFPS->setPosition(core::vector3df(0.0, 10.0, -100.0)); 
    camFPS->setTarget(core::vector3df(0.0, 0.0, 0.0)); 
#endif 
    //////////////////////////////////////////////////////////////// 

    int lastFPS = -1; 

    while(device->run()){ 
     if(device->isWindowActive()){ 
      driver->beginScene(true, true, video::SColor(255, 100, 100, 100)); 
#ifdef ADD_RTT 
      if(rt){ 
       driver->setRenderTarget(rt, true, true, video::SColor(255, 100, 100, 100)); 
       cubeNode->setVisible(true); 
       cubeNode2->setVisible(false); 
       smgr->drawAll(); 
       driver->setRenderTarget(0, true, true, video::SColor(64, 64, 64, 64)); 
      } 
      cubeNode->setVisible(false); 
      cubeNode2->setVisible(true); 
#endif 
      smgr->drawAll(); 
      driver->endScene(); 
     } 
     int fps = driver->getFPS(); 

     int lastFPS = -1; 

     if (lastFPS != fps) 
     { 
      core::stringw str = L"Irrlicht Engine - Quake 3 Map example ["; 
      str += driver->getName(); 
      str += "] FPS:"; 
      str += fps; 

      device->setWindowCaption(str.c_str()); 
      lastFPS = fps; 
     } 
    } 
} 



//opengl.vert 
// 
////uniform mat4 mWorldViewProj; 
//void main(void) 
//{ 
// gl_TexCoord[0] = gl_MultiTexCoord0; 
// gl_Position = mWorldViewProj * gl_Vertex; 
//} 
// 
// 
////opengl.frag 
//uniform sampler2D textureUnit0; 
//void main(void) 
//{ 
// vec4 color = texture(textureUnit0, gl_TexCoord[0]); 
// gl_FragColor = color; 
//} 

你可以選擇任何圖片。

Answer 1

着色器的回調看起來不錯。 在像素着色器中嘗試此行

vec4 color = texture2D(textureUnit0, gl_TexCoord[0].xy);