在OpenGL多維數據集上顯示多個紋理，C++ GLFW

Question

因此，我使用GLFW進行窗口管理，並且我使用GLEW進行擴展管理。我正在嘗試寫一個我的兄弟提出的跨平臺遊戲。這是一款紙牌遊戲。但是，爲了獲得3D表面上紋理貼圖和渲染的基礎知識，我試圖獲取一些卡片紋理以顯示在立方體的兩側。我的第一個問題是使用glfw的TGA加載程序，其中只有第一個要加載的紋理可以顯示（雖然它會在我嘗試紋理的每個表面上正確顯示），儘管已經使用glGenTextures的GLuint指針數組。然後，我發現http://home.comcast.net/~mlyn7576/OpenGL-TGA/，它也似乎工作，但現在只顯示最後一個加載的紋理，並且它在所有面上顯示一個紋理，即使我只引用它的GL名稱一次。那麼我做錯了什麼？我無法理解爲什麼只顯示一個加載的紋理。

這裏是我的主頭：

#ifndef _RPSEVOLVED_H_ 
#define _RPSEVOLVED_H_ 
#endif 

#include <iostream> 
#include <math.h> 

#include <gl\glew.h> 
#include <gl\glfw.h> 
#include <stdint.h> 

using namespace std; 

class RPSEvolved 
{ 
private: 
    bool Running; 

public: 
    static RPSEvolved* instance; 
    RPSEvolved(); 
    int OnExecute(); 
    GLuint cardBackId; 
    GLuint bgId; 
    GLuint airCardId; 
    GLuint earthCardId; 
    GLuint fireCardId; 
    GLuint lightningCardId; 
    GLuint waterCardId; 

public: 
    bool OnInit(); 
    void OnEvent(/*SDL_Event* ev*/); 
    void OnLoop(); 
    void OnRender(); 
    void OnCleanup(); 

    //callbacks 
    static void GLFWCALL OnKeyCB(int key, int action); 
    static void OnWindowCloseCB(); 
    static RPSEvolved* GetInstance(); 
    void GLFWCALL OnCharCB(int key, int action); 
    void GLFWCALL OnMouseWheelCB(int pos); 
    void GLFWCALL OnMouseMoveCB(int x, int y); 
    void GLFWCALL OnMouseButtonCB(int button, int action); 
}; 

這裏是我的初始化代碼：

#include "RPSEvolved.h" 
#include "RPSE_TGA.h" 

bool RPSEvolved::OnInit() 
{ 
    if(glfwInit() == GL_FALSE) 
    { 
     cout << "Error initializing GLFW"; 
     return false; 
    } 

    if(glfwOpenWindow(1024, 768, 8, 8, 8, 8, 32, 32, GLFW_WINDOW) == GL_FALSE) 
    { 
     cout << "Error initializing GLFW"; 
     return false; 
    } 

    glEnable(GL_DEPTH_TEST); 
    glEnable(GL_COLOR_MATERIAL); 
    glEnable(GL_TEXTURE_2D); 
    glEnable(GL_NORMALIZE); //Automatically normalize normals 
    glShadeModel(GL_SMOOTH); 

    glMatrixMode(GL_PROJECTION); 
    gluPerspective(45, 1024/768, 1, 100); 
    glMatrixMode(GL_MODELVIEW); 

    glfwDisable(GLFW_AUTO_POLL_EVENTS); 
    glClearColor(0, 0, 0, 255); 

    glfwSetWindowCloseCallback((GLFWwindowclosefun)OnWindowCloseCB); 
    glfwSetKeyCallback(OnKeyCB); 

    cardBackId = load_texture_TGA("images\\cardBack.tga", NULL, NULL, GL_CLAMP, GL_CLAMP); 
    bgId = load_texture_TGA("images\\bg.tga", NULL, NULL, GL_CLAMP, GL_CLAMP); 
    airCardId = load_texture_TGA("images\\airCard.tga", NULL, NULL, GL_CLAMP, GL_CLAMP); 
    earthCardId = load_texture_TGA("images\\earthCard.tga", NULL, NULL, GL_CLAMP, GL_CLAMP); 
    fireCardId = load_texture_TGA("images\\fireCard.tga", NULL, NULL, GL_CLAMP, GL_CLAMP); 
    lightningCardId = load_texture_TGA("images\\lightningCard.tga", NULL, NULL, GL_CLAMP, GL_CLAMP); 
    waterCardId = load_texture_TGA("images\\waterCard.tga", NULL, NULL, GL_CLAMP, GL_CLAMP); 

    return true; 
} 

而且我的顯示代碼：

#include "RPSEvolved.h" 

void RPSEvolved::OnRender() 
{ 
    glMatrixMode(GL_MODELVIEW); 
    glLoadIdentity(); 

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); 

    gluLookAt(0.0f, 5.0f, 30.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, 0.0f); 

    static float _angle = 0.0f; _angle -= 0.3f; 

    glEnable(GL_TEXTURE_2D); 

    glRotatef(_angle, 0.0f, 1.0f, 0.0f); 

    glColor4f(1.0f, 1.0f, 1.0f, 0.0f); 

    glBegin(GL_QUADS); 

    glBindTexture(GL_TEXTURE_2D, cardBackId); 
    glNormal3f(0.0f, 0.0f, 1.0f); // front 
    glTexCoord2f(0.0f, 0.0f); glVertex3f(-3.0f, -5.0f, 3.0f); 
    glTexCoord2f(1.0f, 0.0f); glVertex3f(3.0f, -5.0f, 3.0f); 
    glTexCoord2f(1.0f, 1.0f); glVertex3f(3.0f, 5.0f, 3.0f); 
    glTexCoord2f(0.0f, 1.0f); glVertex3f(-3.0f, 5.0f, 3.0f); 

    glBindTexture(GL_TEXTURE_2D, airCardId); 

    glNormal3f(1.0f, 0.0f, 0.0f); // right 
    glTexCoord2f(0.0f, 0.0f); glVertex3f(3.0f, -4.0f, 3.0f); 
    glTexCoord2f(1.0f, 0.0f); glVertex3f(3.0f, -4.0f, -3.0f); 
    glTexCoord2f(1.0f, 1.0f); glVertex3f(3.0f, 4.0f, -3.0f); 
    glTexCoord2f(0.0f, 1.0f); glVertex3f(3.0f, 4.0f, 3.0f); 

    glBindTexture(GL_TEXTURE_2D, earthCardId); 

    glNormal3f(0.0f, 0.0f, -1.0f); // back 
    glTexCoord2f(0.0f, 0.0f); glVertex3f(3.0f, 4.0f, -3.0f); 
    glTexCoord2f(1.0f, 0.0f); glVertex3f(-3.0f, 4.0f, -3.0f); 
    glTexCoord2f(1.0f, 1.0f); glVertex3f(-3.0f, -4.0f, -3.0f); 
    glTexCoord2f(0.0f, 1.0f); glVertex3f(3.0f, -4.0f, -3.0f); 

    glBindTexture(GL_TEXTURE_2D, fireCardId); 

    glNormal3f(-1.0f, 0.0f, 0.0f); // left 
    glTexCoord2f(0.0f, 0.0f); glVertex3f(-3.0f, 4.0f, -3.0f); 
    glTexCoord2f(1.0f, 0.0f); glVertex3f(-3.0f, 4.0f, 3.0f); 
    glTexCoord2f(1.0f, 1.0f); glVertex3f(-3.0f, -4.0f, 3.0f); 
    glTexCoord2f(0.0f, 1.0f); glVertex3f(-3.0f, -4.0f, -3.0f); 

    glBindTexture(GL_TEXTURE_2D, lightningCardId); 

    glNormal3f(0.0f, 1.0f, 0.0f); // top 
    glTexCoord2f(0.0f, 0.0f); glVertex3f(3.0f, 4.0f, 3.0f); 
    glTexCoord2f(1.0f, 0.0f); glVertex3f(-3.0f, 4.0f, 3.0f); 
    glTexCoord2f(1.0f, 1.0f); glVertex3f(-3.0f, 4.0f, -3.0f); 
    glTexCoord2f(0.0f, 1.0f); glVertex3f(3.0f, 4.0f, -3.0f); 

    glBindTexture(GL_TEXTURE_2D, waterCardId); 

    glNormal3f(0.0f, -1.0f, 0.0f); // top 
    glTexCoord2f(0.0f, 0.0f); glVertex3f(-3.0f, -4.0f, 3.0f); 
    glTexCoord2f(1.0f, 0.0f); glVertex3f(3.0f, -4.0f, 3.0f); 
    glTexCoord2f(1.0f, 1.0f); glVertex3f(3.0f, -4.0f, -3.0f); 
    glTexCoord2f(0.0f, 1.0f); glVertex3f(-3.0f, -4.0f, -3.0f); 

    glEnd(); 

    glfwSwapBuffers(); 
} 

需要注意的是，如果我是來取代在兩個電話在調用glfwLoadTexture2D（）的OnInit（）中調用load_texture_TGA，這就是我只能得到冷杉問題的地方st紋理顯示。發生什麼事情，紋理不會像他們應該顯示的那樣顯示？

P.S.對不起，如果這真的很長，我習慣於在尋求編碼幫助時提供所有我認爲合適的信息。

Answer 1

我認爲你需要做的每一個面在一個單獨的批處理：

glBindTexture(GL_TEXTURE_2D, cardBackId); 
glBegin(GL_QUADS); 
// front vertices.. 
glEnd(); 

glBindTexture(GL_TEXTURE_2D, airCardId); 
glBegin(GL_QUADS); 
// Right vertices.. 
glEnd(); 

// Other faces... 

有幾個選擇，它會讓你呈現單批立方體：

• 生成單個紋理，其中包含立方體的所有面。然後爲立方體的頂點提供適當的紋理座標。 您可以爲此使用2d紋理或3d紋理。
• 綁定不同紋理單元寄存器中的所有紋理並寫入像素着色器。