SFML + OpenGL：无法绘制立方体
[英]SFML + OpenGL: Unable to draw cube
问题描述
I've worked with OpenGL before, and it has been a while, but I didn't think it was this bad. 
我以前使用过OpenGL，并且已经有一段时间了，但是我并不认为这很糟糕。 There's something I'm missing in this code. 这段代码中我缺少一些东西。 I'm just trying to see a cube that I'm drawing using the cube() function. 我只是想看看正在使用cube()函数绘制的cube() 。
Things I've done/tried... 我做过/尝试过的事情...
- flipping the translation between + and - z in the main loop 在主循环中翻转+和-z之间的转换
- turning backface culling on/off before main loop 在主循环之前打开/关闭背面剔除
- glLoadIdentity() at the beginning 开头是glLoadIdentity（）
- set up my projection at the beginning 一开始就设定我的投影
- window.resetGLStates() at the beginning 开头的window.resetGLStates（）
- window.setActive(true) at the beginning 开头的window.setActive（true）
- made sure I stayed in glMatrixMode(GL_MODELVIEW) 确保我呆在glMatrixMode（GL_MODELVIEW）
What am I missing? 我想念什么？ All I can see is the clear color I've specified, filling up the screen and taunting me. 我所看到的只是我指定的清晰颜色，填满了屏幕并嘲笑我。
#include <SFML/System.hpp>
#include <SFML/Window.hpp>
#include <SFML/Graphics.hpp>
#include <SFML/OpenGL.hpp>
void cube();
int gltest()
{
sf::RenderWindow window(sf::VideoMode(800, 600), "SFML works!", sf::Style::Default);
window.setVerticalSyncEnabled(true);
window.setActive(true);
window.resetGLStates();
sf::Vector2u wsize = window.getSize();
glClearColor(0.3f, 0.3f, 0.3f, 1.f);
glDepthMask(true);
glEnable(GL_DEPTH_TEST);
//to make sure I'm not missing anything here.
glDisable(GL_CULL_FACE);
glMatrixMode(GL_PROJECTION);
glViewport(0, 0, wsize.x, wsize.y);
gluPerspective(60, (float)wsize.x / (float)wsize.y, 0.1f, 512.f);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
bool running = true;
while(running)
{
sf::Event event;
while(window.pollEvent(event))
{
switch(event.type)
{
case sf::Event::KeyPressed:
if(event.key.code != sf::Keyboard::Escape) { break; }
case sf::Event::Closed:
running = false;
break;
case sf::Event::Resized:
wsize.x = event.size.width;
wsize.y = event.size.height;
glMatrixMode(GL_PROJECTION);
glViewport(0, 0, wsize.x, wsize.y);
gluPerspective(60.f, (float)wsize.x / (float)wsize.y, 0.1f, 512.f);
glMatrixMode(GL_MODELVIEW);
break;
default:
break;
}
}
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glPushMatrix();
glTranslatef(0.f, 0.f, 5.f);
cube();
glPopMatrix();
window.display();
}
return 0;
}
void cube()
{
glBegin(GL_QUADS); // Draw The Cube Using quads
glColor3f(0.0f,1.0f,0.0f); // Color Green
glNormal3f(0.f, 1.f, 0.f);
glVertex3f( 1.0f, 1.0f,-1.0f); // Top Right Of The Quad (Top)
glNormal3f(0.f, 1.f, 0.f);
glVertex3f(-1.0f, 1.0f,-1.0f); // Top Left Of The Quad (Top)
glNormal3f(0.f, 1.f, 0.f);
glVertex3f(-1.0f, 1.0f, 1.0f); // Bottom Left Of The Quad (Top)
glNormal3f(0.f, 1.f, 0.f);
glVertex3f( 1.0f, 1.0f, 1.0f); // Bottom Right Of The Quad (Top)
glColor3f(1.0f,0.5f,0.0f); // Color Orange
glNormal3f(0.f, -1.f, 0.f);
glVertex3f( 1.0f,-1.0f, 1.0f); // Top Right Of The Quad (Bottom)
glNormal3f(0.f, -1.f, 0.f);
glVertex3f(-1.0f,-1.0f, 1.0f); // Top Left Of The Quad (Bottom)
glNormal3f(0.f, -1.f, 0.f);
glVertex3f(-1.0f,-1.0f,-1.0f); // Bottom Left Of The Quad (Bottom)
glNormal3f(0.f, -1.f, 0.f);
glVertex3f( 1.0f,-1.0f,-1.0f); // Bottom Right Of The Quad (Bottom)
glColor3f(1.0f, 0.0f, 0.0f); // Color Red
glNormal3f(0.f, 0.f, 1.f);
glVertex3f( 1.0f, 1.0f, 1.0f); // Top Right Of The Quad (Front)
glNormal3f(0.f, 0.f, 1.f);
glVertex3f(-1.0f, 1.0f, 1.0f); // Top Left Of The Quad (Front)
glNormal3f(0.f, 0.f, 1.f);
glVertex3f(-1.0f,-1.0f, 1.0f); // Bottom Left Of The Quad (Front)
glNormal3f(0.f, 0.f, 1.f);
glVertex3f( 1.0f,-1.0f, 1.0f); // Bottom Right Of The Quad (Front)
glColor3f(1.0f, 1.0f, 0.0f); // Color Yellow
glNormal3f(0.f, 0.f, -1.f);
glVertex3f( 1.0f,-1.0f,-1.0f); // Top Right Of The Quad (Back)
glNormal3f(0.f, 0.f, -1.f);
glVertex3f(-1.0f,-1.0f,-1.0f); // Top Left Of The Quad (Back)
glNormal3f(0.f, 0.f, -1.f);
glVertex3f(-1.0f, 1.0f,-1.0f); // Bottom Left Of The Quad (Back)
glNormal3f(0.f, 0.f, -1.f);
glVertex3f( 1.0f, 1.0f,-1.0f); // Bottom Right Of The Quad (Back)
glColor3f(0.0f, 0.0f, 1.0f); // Color Blue
glNormal3f(-1.f, 0.f, 0.f);
glVertex3f(-1.0f, 1.0f, 1.0f); // Top Right Of The Quad (Left)
glNormal3f(-1.f, 0.f, 0.f);
glVertex3f(-1.0f, 1.0f,-1.0f); // Top Left Of The Quad (Left)
glNormal3f(-1.f, 0.f, 0.f);
glVertex3f(-1.0f,-1.0f,-1.0f); // Bottom Left Of The Quad (Left)
glNormal3f(-1.f, 0.f, 0.f);
glVertex3f(-1.0f,-1.0f, 1.0f); // Bottom Right Of The Quad (Left)
glColor3f(1.0f, 0.0f, 1.0f); // Color Violet
glNormal3f(1.f, 0.f, 0.f);
glVertex3f( 1.0f, 1.0f,-1.0f); // Top Right Of The Quad (Right)
glNormal3f(1.f, 0.f, 0.f);
glVertex3f( 1.0f, 1.0f, 1.0f); // Top Left Of The Quad (Right)
glNormal3f(1.f, 0.f, 0.f);
glVertex3f( 1.0f,-1.0f, 1.0f); // Bottom Left Of The Quad (Right)
glNormal3f(1.f, 0.f, 0.f);
glVertex3f( 1.0f,-1.0f,-1.0f); // Bottom Right Of The Quad (Right)
glEnd(); // End Drawing The Cube
}
1 个解决方案
解决方案1
5 已采纳 2013-05-31 18:43:58
Here: 这里：
glMatrixMode(GL_PROJECTION);
glViewport(0, 0, wsize.x, wsize.y);
gluPerspective(60, (float)wsize.x / (float)wsize.y, 0.1f, 512.f);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
and here: 和这里：
wsize.x = event.size.width;
wsize.y = event.size.height;
glMatrixMode(GL_PROJECTION);
glViewport(0, 0, wsize.x, wsize.y);
gluPerspective(60.f, (float)wsize.x / (float)wsize.y, 0.1f, 512.f);
glMatrixMode(GL_MODELVIEW);
add a glLoadIdentity() after the glMatrixMode(GL_PROJECTION) and glMatrixMode(GL_MODELVIEW) calls. 在glMatrixMode(GL_PROJECTION)和glMatrixMode(GL_MODELVIEW)调用之后添加glLoadIdentity() 。
gluPerspective() multiplies a matrix against the current matrix. gluPerspective() 将矩阵与当前矩阵相乘。 The code seems to be assuming it overwrites the current matrix. 该代码似乎是假设它覆盖了当前矩阵。
A gluPerspective() matrix multiplied by itself multiple times isn't a meaningful projection matrix. 一个gluPerspective()矩阵自身乘以多次并不是一个有意义的投影矩阵。
And while you're there you can remove the resize handler: 在此期间，您可以删除调整大小处理程序：
#include <SFML/System.hpp>
#include <SFML/Window.hpp>
#include <SFML/Graphics.hpp>
#include <SFML/OpenGL.hpp>
void cube()
{
glBegin(GL_QUADS); // Draw The Cube Using quads
glColor3f(0.0f,1.0f,0.0f); // Color Green
glNormal3f(0.f, 1.f, 0.f);
glVertex3f( 1.0f, 1.0f,-1.0f); // Top Right Of The Quad (Top)
glNormal3f(0.f, 1.f, 0.f);
glVertex3f(-1.0f, 1.0f,-1.0f); // Top Left Of The Quad (Top)
glNormal3f(0.f, 1.f, 0.f);
glVertex3f(-1.0f, 1.0f, 1.0f); // Bottom Left Of The Quad (Top)
glNormal3f(0.f, 1.f, 0.f);
glVertex3f( 1.0f, 1.0f, 1.0f); // Bottom Right Of The Quad (Top)
glColor3f(1.0f,0.5f,0.0f); // Color Orange
glNormal3f(0.f, -1.f, 0.f);
glVertex3f( 1.0f,-1.0f, 1.0f); // Top Right Of The Quad (Bottom)
glNormal3f(0.f, -1.f, 0.f);
glVertex3f(-1.0f,-1.0f, 1.0f); // Top Left Of The Quad (Bottom)
glNormal3f(0.f, -1.f, 0.f);
glVertex3f(-1.0f,-1.0f,-1.0f); // Bottom Left Of The Quad (Bottom)
glNormal3f(0.f, -1.f, 0.f);
glVertex3f( 1.0f,-1.0f,-1.0f); // Bottom Right Of The Quad (Bottom)
glColor3f(1.0f, 0.0f, 0.0f); // Color Red
glNormal3f(0.f, 0.f, 1.f);
glVertex3f( 1.0f, 1.0f, 1.0f); // Top Right Of The Quad (Front)
glNormal3f(0.f, 0.f, 1.f);
glVertex3f(-1.0f, 1.0f, 1.0f); // Top Left Of The Quad (Front)
glNormal3f(0.f, 0.f, 1.f);
glVertex3f(-1.0f,-1.0f, 1.0f); // Bottom Left Of The Quad (Front)
glNormal3f(0.f, 0.f, 1.f);
glVertex3f( 1.0f,-1.0f, 1.0f); // Bottom Right Of The Quad (Front)
glColor3f(1.0f, 1.0f, 0.0f); // Color Yellow
glNormal3f(0.f, 0.f, -1.f);
glVertex3f( 1.0f,-1.0f,-1.0f); // Top Right Of The Quad (Back)
glNormal3f(0.f, 0.f, -1.f);
glVertex3f(-1.0f,-1.0f,-1.0f); // Top Left Of The Quad (Back)
glNormal3f(0.f, 0.f, -1.f);
glVertex3f(-1.0f, 1.0f,-1.0f); // Bottom Left Of The Quad (Back)
glNormal3f(0.f, 0.f, -1.f);
glVertex3f( 1.0f, 1.0f,-1.0f); // Bottom Right Of The Quad (Back)
glColor3f(0.0f, 0.0f, 1.0f); // Color Blue
glNormal3f(-1.f, 0.f, 0.f);
glVertex3f(-1.0f, 1.0f, 1.0f); // Top Right Of The Quad (Left)
glNormal3f(-1.f, 0.f, 0.f);
glVertex3f(-1.0f, 1.0f,-1.0f); // Top Left Of The Quad (Left)
glNormal3f(-1.f, 0.f, 0.f);
glVertex3f(-1.0f,-1.0f,-1.0f); // Bottom Left Of The Quad (Left)
glNormal3f(-1.f, 0.f, 0.f);
glVertex3f(-1.0f,-1.0f, 1.0f); // Bottom Right Of The Quad (Left)
glColor3f(1.0f, 0.0f, 1.0f); // Color Violet
glNormal3f(1.f, 0.f, 0.f);
glVertex3f( 1.0f, 1.0f,-1.0f); // Top Right Of The Quad (Right)
glNormal3f(1.f, 0.f, 0.f);
glVertex3f( 1.0f, 1.0f, 1.0f); // Top Left Of The Quad (Right)
glNormal3f(1.f, 0.f, 0.f);
glVertex3f( 1.0f,-1.0f, 1.0f); // Bottom Left Of The Quad (Right)
glNormal3f(1.f, 0.f, 0.f);
glVertex3f( 1.0f,-1.0f,-1.0f); // Bottom Right Of The Quad (Right)
glEnd(); // End Drawing The Cube
}
int main()
{
sf::RenderWindow window(sf::VideoMode(800, 600), "SFML works!", sf::Style::Default);
window.setVerticalSyncEnabled(true);
window.setActive(true);
window.resetGLStates();
bool running = true;
while(running)
{
sf::Event event;
while(window.pollEvent(event))
{
switch(event.type)
{
case sf::Event::KeyPressed:
if(event.key.code != sf::Keyboard::Escape) { break; }
case sf::Event::Closed:
running = false;
break;
default:
break;
}
}
glClearColor(0.3f, 0.3f, 0.3f, 1.f);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
sf::Vector2u wsize = window.getSize();
glViewport(0, 0, wsize.x, wsize.y);
gluPerspective(60, (float)wsize.x / (float)wsize.y, 0.1f, 512.f);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glPushMatrix();
glTranslatef(0.f, 0.f, -5.f);
cube();
glPopMatrix();
GLenum err = glGetError();
window.display();
}
return 0;
}
声明:本站的技术帖子网页，遵循CC BY-SA 4.0协议，如果您需要转载，请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.
相关问题
如何在OpenGL中绘制一个立方体？ - How to draw a cube in OpenGL?
在 OpenGL 中绘制一个实心立方体 - Draw a solid cube in OpenGL
如何在某些世界坐标处绘制立方体，OpenGL - How to draw cube at some world coordinates, OpenGL
OpenGL-当我在立方体上绘制边框时，会出现多余的线条 - OpenGL - Extra line appears when I draw a border on a cube
OpenGL glfw 无法使用着色器绘制点 - OpenGL glfw unable to draw a point using shader
无法确定 Opengl 绘制的平面方向 - Unable to determine plane orientation for Opengl draw
SFML中的OpenGL累积缓冲区？ - OpenGL Accumulation Buffer in SFML?
OpenGL的SFML着色器错误 - SFML shader error with OpenGL
SFML OpenGL绘图文本 - SFML OpenGL Drawing Text
C ++ OpenGL SFML - C++ OpenGL SFML
相关标签