为什么纹理不显示？

问题描述

嗨。

我写了一个代码，但它只显示没有纹理的立方体

Hi.
I wrote a code but it''s just show a cube without texture

#include "Texture.h"

int main(int argc,char* argv[])
{
    SDL_Init(SDL_INIT_EVERYTHING);
    SDL_SetVideoMode(640,480,32,SDL_OPENGL);
    glEnable(GL_DEPTH_TEST);
    glClearColor(0,0,0,1);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    gluPerspective(45,800/600,1,100);
    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
    gluLookAt(7,7,7,
              0,0,0,
              0,1,0);
    Texture* textre=new Texture((IMG_Load("Texture.png")));
    int rot=0;
    while(1)
    {

        glLoadIdentity();

        gluLookAt(7,7,7,
            0,0,0,
            0,1,0);
        glRotatef(rot,0,1,0);
        glBindTexture(GL_TEXTURE_2D,textre->textureID);
        glBegin(GL_QUADS);

        glTexCoord2f(0,0);
        glVertex3f(-.5f , -.5f , .5f);
        glTexCoord2f(1,0);
        glVertex3f(.5f , -.5f , .5f);
        glTexCoord2f(1,1);
        glVertex3f(.5f , .5f, .5f);
        glTexCoord2f(0,1);
        glVertex3f(-.5f , .5f , .5f);


        glTexCoord2f(0,0);
        glVertex3f(-.5f , -.5f , -.5f);
        glTexCoord2f(1,0);
        glVertex3f(.5f , -.5f , -.5f);
        glTexCoord2f(1,1);
        glVertex3f(.5f , .5f , -.5f);
        glTexCoord2f(0,1);
        glVertex3f(-.5f , .5f , -.5f);



        glVertex3f(-.5f , .5f , -.5f);
        glVertex3f(.5f , .5f , -.5f);
        glVertex3f(.5f , .5f , .5f);
        glVertex3f(-.5f , .5f , .5f);



        glVertex3f(.5f , -.5f , -.5f);
        glVertex3f(.5f , .5f ,-.5f);
        glVertex3f(.5f , .5f , .5f);
        glVertex3f(.5f , -.5f , .5f);



        glVertex3f(-.5f , .5f , .5f);
        glVertex3f(-.5f , -.5f ,.5f);
        glVertex3f(-.5f , -.5f , -.5f);
        glVertex3f(-.5f , .5f , -.5f);


        glVertex3f(.5f , -.5f , .5f);
        glVertex3f(-.5f , -.5f , .5f);
        glVertex3f(-.5f , -.5f , -.5f);
        glVertex3f(.5f , -.5f , -.5f);

        glEnd();
        SDL_GL_SwapBuffers();
        rot++;
        SDL_Delay(16);
        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    }


    return 0;
}

------质地：

------ texture :

#pragma once

#include <SDL.h>
#include <SDL_image.h>
#include <SDL_opengl.h>

class Texture
{
public:
    Texture(SDL_Surface* surface)
    {
        unsigned int nOfColor=surface->format->BytesPerPixel;
        unsigned int textureFormat;
        if(nOfColor==4)
            if(surface->format->Rmask==0x000000ff)
                textureFormat=GL_RGBA;
            else
                textureFormat=GL_BGRA;
        else
            if (surface->format->Rmask==0x000000ff)
                textureFormat=GL_RGB;
            else
                textureFormat=GL_BGR;
        glGenTextures(1,&textureID);
        glBindTexture(GL_TEXTURE_2D,textureID);
        glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR);
        glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR);
        glTexImage2D(GL_TEXTURE_2D,0,nOfColor,surface->w,surface->h,0,textureFormat,GL_UNSIGNED_BYTE,surface->pixels);
        SDL_FreeSurface(surface);
    }
    unsigned int textureID;
};

推荐答案

glClear( GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT );

2.请在纹理映射之前启用GL_TEXTURE_2D。在Texture类中，您可以通过调用

2. Please enable GL_TEXTURE_2D before texture mapping. Inside Texture class you can enable this by calling

glEnable( GL_TEXTURE_2D )

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