当我使用SOIL加载下一个图像时，它将替换我之前加载的所有图像

Question

这是我编码的一部分，一个简单的气球点击游戏。我有一个背景图像和气球的另一个图像，代码似乎取代了所有我以前加载的图像。Helppppp

    GLuint tex_2d;
    GLuint tex_bg;
    int main (int argc, char **argv)
    {
        glutInit(&argc, argv);
        glutInitDisplayMode(GLUT_DOUBLE);
        glutInitWindowSize(800, 800);
        glutInitWindowPosition(100, 100);
        glutCreateWindow("Lab Assignment");
        init();
        glutDisplayFunc(display);
        glutIdleFunc(display);
        glutMouseFunc(mouse);
        glutMainLoop();
        return EXIT_SUCCESS;
    }

这是我放置图像加载代码的地方，tex_bg为背景background.bmp, tex_2d为气球图像。为tex_2d加载的图像替换了之前加载的背景图像。

    void init()
    {
        tex_bg = SOIL_load_OGL_texture
        (
            "background.bmp",
            SOIL_LOAD_AUTO,
            SOIL_CREATE_NEW_ID,
            SOIL_FLAG_MIPMAPS | SOIL_FLAG_INVERT_Y | SOIL_FLAG_NTSC_SAFE_RGB | SOIL_FLAG_COMPRESS_TO_DXT
        );
        tex_2d = SOIL_load_OGL_texture
        (
            "balloonImage.bmp",
            SOIL_LOAD_AUTO,
            SOIL_CREATE_NEW_ID,
            SOIL_FLAG_MIPMAPS | SOIL_FLAG_INVERT_Y | SOIL_FLAG_NTSC_SAFE_RGB | SOIL_FLAG_COMPRESS_TO_DXT
        );
        if (tex_2d == 0 || tex_bg == 0)
        {
            printf( "SOIL loading error: '%s'n", SOIL_last_result() );
            exit(0);
        }
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR_MIPMAP_LINEAR);
    }

    void drawQuadOutline()
    {
        glEnable(GL_TEXTURE_2D);
        glBegin(GL_QUADS);
            glBindTexture(GL_TEXTURE_2D, tex_bg);
            glNormal3f(0, 1, 0);
            glTexCoord2f(0.0f, 0.0f);   glVertex3f(-1.0f, -1.0f, 1.0f);
            glTexCoord2f(1.0f, 0.0f);   glVertex3f(1.0f, -1.0f, 1.0f);
            glTexCoord2f(1.0f, 1.0f);   glVertex3f(1.0f, 1.0f, 1.0f);
            glTexCoord2f(0.0f, 1.0f);   glVertex3f(-1.0f, 1.0f, 1.0f);
        glEnd();
        glDisable(GL_TEXTURE_2D);
    }
void display()
{
    glClear(GL_COLOR_BUFFER_BIT);
    drawQuadOutline();
    drawCircleOutline(balloon[balloonBurst]);
    glutSwapBuffers();
}   
    void drawCircleOutline(Circle o)
    {
        float angle;
        glEnable(GL_TEXTURE_2D);
        glBegin(GL_POLYGON);
            glBindTexture(GL_TEXTURE_2D, tex_2d);
            for(angle=0.0f; angle<360.0f; angle+=2.0f)
            {        
                float radian = angle * (pi/180.0f);
                float xcos = (float)cos(radian);
                float ysin = (float)sin(radian);
                float x = xcos * o.r  + o.pos.x;
                float y = ysin * o.r  + o.pos.y;
                float tx = xcos * 0.5f + 0.5f;
                float ty = ysin * 0.5f + 0.5f;
                glTexCoord2f(tx, ty);
                glVertex2f(x, y);
            }
        glEnd();
        glDisable(GL_TEXTURE_2D);
    }

是我的编码问题吗?还是土壤功能的误用?

Answer 1

您的编码问题是您在glBegin (...)和glEnd (...)之间调用glBindTexture(...)。

无效;如果你检查了glGetError (...)，你就会知道这一点。

你需要重写这段代码:

    glBegin(GL_POLYGON);
        glBindTexture(GL_TEXTURE_2D, tex_2d);
    ...
    glBegin(GL_QUADS);
        glBindTexture(GL_TEXTURE_2D, tex_bg);

:

    glBindTexture(GL_TEXTURE_2D, tex_2d);
    glBegin(GL_POLYGON);
    ...
    glBindTexture(GL_TEXTURE_2D, tex_bg);
    glBegin(GL_QUADS);