openGL將多個紋理綁定到四邊形

Question

我必須有6個四邊形組成一個立方體，並且我想將不同的紋理綁定到每個四邊形。 我到底該怎么做？ 這是我到目前為止所擁有的：

glPushMatrix(); {
        glTranslatef(x, y, z);
        glBegin(GL_QUADS);
        {
            //FrontFace
            if(id != Blocks.Air){
                setTexCords = true;
                glColor3f(1, 1, 1);
                id.getFrontTexture().bind();
            }else{
                setTexCords = false;
                if(textureType == "IMAGE"){

                }else{
                    glColor3d(toFloatColor(tid.getRed()), toFloatColor(tid.getGreen()), toFloatColor(tid.getBlue()));
                }
            }
            if(setTexCords) glTexCoord2f(0, 0);
            glVertex3f(-Blocks.BLOCK_SIZE,-Blocks.BLOCK_SIZE,Blocks.BLOCK_SIZE);
            if(setTexCords) glTexCoord2f(0, 1);
            glVertex3f(Blocks.BLOCK_SIZE,-Blocks.BLOCK_SIZE,Blocks.BLOCK_SIZE);
            if(setTexCords) glTexCoord2f(1, 1);
            glVertex3f(Blocks.BLOCK_SIZE,Blocks.BLOCK_SIZE,Blocks.BLOCK_SIZE);
            if(setTexCords) glTexCoord2f(1, 0);
            glVertex3f(-Blocks.BLOCK_SIZE,Blocks.BLOCK_SIZE,Blocks.BLOCK_SIZE);
            {
            glEnd();


            glBegin(GL_QUADS);
            {
            //BackFace
            if(id != Blocks.Air){
                setTexCords = true;
                id.getBackTexture().bind();
            }else{
                setTexCords = false;
                if(textureType == "IMAGE"){

                }else{
                    glColor3d(toFloatColor(tid.getRed()), toFloatColor(tid.getGreen()), toFloatColor(tid.getBlue()));
                }
            }
            if(setTexCords) glTexCoord2f(0, 0);
            glVertex3f(-Blocks.BLOCK_SIZE,-Blocks.BLOCK_SIZE,-Blocks.BLOCK_SIZE);
            if(setTexCords) glTexCoord2f(0, 1);
            glVertex3f(-Blocks.BLOCK_SIZE,Blocks.BLOCK_SIZE,-Blocks.BLOCK_SIZE);
            if(setTexCords) glTexCoord2f(1, 1);
            glVertex3f(Blocks.BLOCK_SIZE,Blocks.BLOCK_SIZE,-Blocks.BLOCK_SIZE);
            if(setTexCords) glTexCoord2f(1, 0);
            glVertex3f(Blocks.BLOCK_SIZE,-Blocks.BLOCK_SIZE,-Blocks.BLOCK_SIZE);
            }
            glEnd();

            glBegin(GL_QUADS);
            {
            //BottomFace
            if(id != Blocks.Air){
                setTexCords = true;
                id.getBottomTexture().bind();
            }else{
                setTexCords = false;
                if(textureType == "IMAGE"){

                }else{
                    glColor3d(toFloatColor(tid.getRed()), toFloatColor(tid.getGreen()), toFloatColor(tid.getBlue()));
                }
            }
            if(setTexCords) glTexCoord2f(0, 0);
            glVertex3f(-Blocks.BLOCK_SIZE,-Blocks.BLOCK_SIZE,-Blocks.BLOCK_SIZE);
            if(setTexCords) glTexCoord2f(0, 1);
            glVertex3f(-Blocks.BLOCK_SIZE,-Blocks.BLOCK_SIZE,Blocks.BLOCK_SIZE);
            if(setTexCords) glTexCoord2f(1, 1);
            glVertex3f(-Blocks.BLOCK_SIZE,Blocks.BLOCK_SIZE,Blocks.BLOCK_SIZE);
            if(setTexCords) glTexCoord2f(1, 0);
            glVertex3f(-Blocks.BLOCK_SIZE,Blocks.BLOCK_SIZE,-Blocks.BLOCK_SIZE);

            }
            glEnd();

            glBegin(GL_QUADS);
            {
            //TopFace
            if(id != Blocks.Air){
                glColor3f(1, 1, 1);
                setTexCords = true;
                id.getTopTexture().bind();
            }else{
                setTexCords = false;
                if(textureType == "IMAGE"){

                }else{
                    glColor3d(toFloatColor(tid.getRed()), toFloatColor(tid.getGreen()), toFloatColor(tid.getBlue()));
                }
            }
            if(setTexCords) glTexCoord2f(0, 0);
            glVertex3f(Blocks.BLOCK_SIZE,-Blocks.BLOCK_SIZE,-Blocks.BLOCK_SIZE);
            if(setTexCords) glTexCoord2f(0, 1);
            glVertex3f(Blocks.BLOCK_SIZE,-Blocks.BLOCK_SIZE,Blocks.BLOCK_SIZE);
            if(setTexCords) glTexCoord2f(1, 1);
            glVertex3f(Blocks.BLOCK_SIZE,Blocks.BLOCK_SIZE,Blocks.BLOCK_SIZE);
            if(setTexCords) glTexCoord2f(1, 0);
            glVertex3f(Blocks.BLOCK_SIZE,Blocks.BLOCK_SIZE,-Blocks.BLOCK_SIZE);

            }
            glEnd();

            glBegin(GL_QUADS);
            {
            //LeftFace
            if(id != Blocks.Air){
                setTexCords = true;
                id.getLeftTexture().bind();
            }else{
                setTexCords = false;
                if(textureType == "IMAGE"){

                }else{
                    glColor3d(toFloatColor(tid.getRed()), toFloatColor(tid.getGreen()), toFloatColor(tid.getBlue()));
                }
            }
            if(setTexCords) glTexCoord2f(0, 0);
            glVertex3f(-Blocks.BLOCK_SIZE,-Blocks.BLOCK_SIZE,-Blocks.BLOCK_SIZE);
            if(setTexCords) glTexCoord2f(0, 1);
            glVertex3f(Blocks.BLOCK_SIZE,-Blocks.BLOCK_SIZE,-Blocks.BLOCK_SIZE);
            if(setTexCords) glTexCoord2f(1, 1);
            glVertex3f(Blocks.BLOCK_SIZE,-Blocks.BLOCK_SIZE,Blocks.BLOCK_SIZE);
            if(setTexCords) glTexCoord2f(1, 0);
            glVertex3f(-Blocks.BLOCK_SIZE,-Blocks.BLOCK_SIZE,Blocks.BLOCK_SIZE);

            }
            glEnd();

            glBegin(GL_QUADS);
            {

            //Right Face
            if(id != Blocks.Air){
                setTexCords = true;
                id.getRightTexture().bind();
            }else{
                setTexCords = false;
                if(textureType == "IMAGE"){

                }else{
                    glColor3d(toFloatColor(tid.getRed()), toFloatColor(tid.getGreen()), toFloatColor(tid.getBlue()));
                }
            }
            if(textureType == "IMAGE"){

            }else{
                glColor3d(toFloatColor(tid.getRed()), toFloatColor(tid.getGreen()), toFloatColor(tid.getBlue()));
            }
            if(setTexCords) glTexCoord2f(0, 0);
            glVertex3f(-Blocks.BLOCK_SIZE,Blocks.BLOCK_SIZE,-Blocks.BLOCK_SIZE);
            if(setTexCords) glTexCoord2f(0, 1);
            glVertex3f(Blocks.BLOCK_SIZE,Blocks.BLOCK_SIZE,-Blocks.BLOCK_SIZE);
            if(setTexCords) glTexCoord2f(1, 1);
            glVertex3f(Blocks.BLOCK_SIZE,Blocks.BLOCK_SIZE,Blocks.BLOCK_SIZE);
            if(setTexCords) glTexCoord2f(1, 0);
            glVertex3f(-Blocks.BLOCK_SIZE,Blocks.BLOCK_SIZE,Blocks.BLOCK_SIZE);
        }
    glEnd();
    }
    glPopMatrix();

每次我運行該應用程序時，頂部都會顯示為黑色，其余的紋理相同。 謝謝你的幫助！

Answer 1

您無法在glBegin / glEnd塊內更改紋理綁定。 在沒有繪制原始圖元的情況下，必須更改此狀態。 話雖這么說：不要使用glBegin / glEnd，也稱為即時模式。 它已不推薦使用，並已從現代OpenGL中刪除。 取而代之，最好使用“頂點數組”（Vertex Arrays）。

同樣，除了切換紋理，還應該使用紋理數組。