Question

我想通过切换到2D场景然后切换回3D来在我的屏幕上渲染2D四边形。除了LWJGL，我不想使用任何外部库。

这是我到目前为止所得到的：

private static void renderLetter(char c, float x, float y) {
    int character = c+1;
    GL11.glPushMatrix();

    setOrthoOn();

    GL11.glTranslatef(x, y, 0);

    float[] xy = game.getResourceManager().getSpriteSheets().get(fontSheet).getXYForCell(character);
    float cellx = game.getResourceManager().getSpriteSheets().get(fontSheet).getCell_sizeX();
    float celly = game.getResourceManager().getSpriteSheets().get(fontSheet).getCell_sizeY();
    float xx = xy[0];
    float yy = xy[1];

    GL11.glBindTexture(GL11.GL_TEXTURE_2D, game.getResourceManager().getTextures().get(game.getResourceManager().getSpriteSheets().get(fontSheet).getTextureID()));
    GL11.glBegin(GL11.GL_QUADS);
        GL11.glTexCoord2f(xx, yy);
        GL11.glVertex2f(0,0);
        GL11.glTexCoord2f(xx+cellx, yy);
        GL11.glVertex2f(fontSize,0);
        GL11.glTexCoord2f(xx+cellx, yy+celly);
        GL11.glVertex2f(fontSize,fontSize);
        GL11.glTexCoord2f(xx, yy+celly);
        GL11.glVertex2f(0,fontSize);
    GL11.glEnd();
    GL11.glBindTexture(GL11.GL_TEXTURE_2D, 0);      

    setOrthoOff();

    GL11.glPopMatrix();
}

public static void setOrthoOn()
{
    GL11.glDisable(GL11.GL_LIGHTING);
    GL11.glClearColor(0.0f, 0.0f, 0.0f, 0.0f);                
    GL11.glClearDepth(1);
    GL11.glViewport(0,0,1360,768);
    GL11.glMatrixMode(GL11.GL_MODELVIEW);
    GL11.glMatrixMode(GL11.GL_PROJECTION);
    GL11.glLoadIdentity();
    GL11.glOrtho(0, 1360, 768, 0, 1, -1);
    GL11.glMatrixMode(GL11.GL_MODELVIEW);
    GL11.glLoadIdentity();
}

public static void setOrthoOff()
{
    GL11.glMatrixMode(GL11.GL_PROJECTION);
    GL11.glLoadIdentity();
    GLU.gluPerspective(game.getFieldOfView(), 1360f/768f, 0.1f, 1000);
    GL11.glMatrixMode(GL11.GL_MODELVIEW);
    GL11.glLoadIdentity();
    GL11.glEnable(GL11.GL_DEPTH_TEST);
    GL11.glDepthFunc(GL11.GL_LEQUAL);
    GL11.glHint(GL11.GL_PERSPECTIVE_CORRECTION_HINT, GL11.GL_NICEST);
}

第一种方法是渲染一个字母。我想要做的是通过调用setOrthoOn切换到2D渲染然后渲染四边形，然后调用setOrthoOff切换回3D。

当我运行它时，这段代码对我没有任何帮助。我做错了什么？

Answer 1

This should do it.

注意：某些代码可能无关紧要。我对OpenGL不太熟悉，但这对我有用。我还建议您静态导入GL11。这样您就不必输入“GL11.BlaBlaBla”，只需输入“BlaBlaBla”即可。

LWJGL - 从3D切换到2D，无需外部库即可渲染文本

1 个答案: