【发布时间】：2021-05-03 12:47:42
【问题描述】：
我正在尝试制作 3D 射击游戏。我认为图像正在加载，因为它的尺寸已显示，但它没有显示为纹理。该程序编译并运行没有错误，但没有纹理。我不知道我在哪里做错了。
main.cpp:
#include "Functions.h"
int main(int argc, char** argv)
{
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);
glutInitWindowSize(wnd_width, wnd_height);
glutInitWindowPosition(300, 100);
glEnable(GL_DEPTH_TEST);
glEnable(GL_NORMALIZE);
glutCreateWindow("OpenGL my");
glutDisplayFunc(display);
glutIdleFunc(Idle);
glutSpecialFunc(KeyPressed);
TextureInit();
glutMainLoop();
return 0;
}
函数.h
#define STB_IMAGE_IMPLEMENTATION
#include <GL/glut.h>
#include <stb_image.h>
#include <iostream>
#include "point.h"
#include "camera.h"
int wnd_width=1300;
int wnd_height=900;
GLdouble aspect = wnd_width/wnd_height;
Camera cam;
unsigned int texture;
float text_coords[] = {0,0, 1,0, 1,1, 0,1};
void DrawFloor();
void DrawWall(float x, float width, float height);
void KeyPressed(int key, int x, int y);
void TextureInit();
void display();
void Idle();
void display(){
glClearColor(0.6, 0.8, 1, 1);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(90, aspect, 0.1, 3);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
gluLookAt(cam.pos.x, cam.pos.y, cam.pos.z,
cam.view.x, cam.view.y, cam.view.z,
0, 0.5, 0);
glBegin(GL_QUADS);
glEnable(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, texture);
glEnableClientState(GL_TEXTURE_COORD_ARRAY);
glTexCoordPointer(2, GL_FLOAT, 0, text_coords);
//glColor3f(0, 0, 0.7);
DrawFloor();
//glColor3f(0, 0.8, 0.1);
DrawWall(-0.5, 2, 0.7);
DrawWall(0.5, 2, 0.7);
glEnd();
glDisableClientState(GL_TEXTURE_COORD_ARRAY);
glutSwapBuffers();
}
void Idle(){
}
void DrawFloor(){
glVertex3d(1, 0, 2.5);
glVertex3d(1, 0, 0);
glVertex3d(-1, 0, 0);
glVertex3d(-1, 0, 2.5);
}
void DrawWall(float x, float width, float height){
glVertex3f(x, height, 0);
glVertex3f(x, height, width);
glVertex3f(x, 0, width);
glVertex3f(x, 0, 0);
}
void KeyPressed(int key, int x, int y){
switch (key) {
case GLUT_KEY_UP: { cam.MoveForward(); break; }
case GLUT_KEY_DOWN: { cam.MoveBack(); break; }
case GLUT_KEY_LEFT: {cam.TurnLeft(); break; }
case GLUT_KEY_RIGHT: {cam.TurnRight(); break; }
}
cam.PrintPosition();
glutPostRedisplay();
}
void TextureInit(){
int width, height, cnt;
unsigned char* data = stbi_load("whitemarble.jpg", &width, &height, &cnt, 0);
if(data==nullptr) std::cout<< "NO\n";
else std::cout<<width<<'\t'<<height<<'\n';
glGenTextures(1, &texture);
glBindTexture(GL_TEXTURE_2D, texture);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height,
0, GL_RGB, GL_UNSIGNED_BYTE, data);
glBindTexture(GL_TEXTURE_2D, 0);
stbi_image_free(data);
}
重做。现在它起作用了。谢谢。但是画面很拉长。
#define STB_IMAGE_IMPLEMENTATION
#include <GL/glut.h>
#include <stb_image.h>
#include <iostream>
#include "point.h"
#include "camera.h"
int wnd_width=1300;
int wnd_height=900;
GLdouble aspect = wnd_width/wnd_height;
Camera cam;
unsigned int texture;
float text_coords[] = {0,0, 1,0, 1,1, 0,1};
void DrawFloor();
void DrawWall(float x, float width, float height);
void KeyPressed(int key, int x, int y);
void TextureInit();
void display();
void Idle();
void TextureInit(){
int width, height, cnt;
unsigned char* data = stbi_load("whitemarble.jpg", &width, &height, &cnt, 0);
if(data==nullptr) std::cout<< "NO\n";
else std::cout<<width<<'\t'<<height<<'\n';
glGenTextures(1, &texture);
glBindTexture(GL_TEXTURE_2D, texture);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height,
0, GL_RGBA, GL_UNSIGNED_BYTE, data);
glBindTexture(GL_TEXTURE_2D, 0);
stbi_image_free(data);
}
void display(){
glClearColor(0.6, 0.8, 1, 1);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(90, aspect, 0.1, 3);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
gluLookAt(cam.pos.x, cam.pos.y, cam.pos.z,
cam.view.x, cam.view.y, cam.view.z,
0, 0.5, 0);
glEnable(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, texture);
glEnableClientState(GL_TEXTURE_COORD_ARRAY);
glBegin(GL_QUADS);
DrawFloor();
DrawWall(-0.5, 2, 0.7);
DrawWall(0.5, 2, 0.7);
glEnd();
glDisableClientState(GL_TEXTURE_COORD_ARRAY);
glutSwapBuffers();
}
void DrawFloor(){
glTexCoord2d(0, 0);
glVertex3d(1, 0, 2.5);
glTexCoord2d(1, 0);
glVertex3d(1, 0, 0);
glTexCoord2d(1, 1);
glVertex3d(-1, 0, 0);
glTexCoord2d(0, 1);
glVertex3d(-1, 0, 2.5);
}
void DrawWall(float x, float width, float height){
glVertex3f(x, height, 0);
glVertex3f(x, height, width);
glVertex3f(x, 0, width);
glVertex3f(x, 0, 0);
}
void KeyPressed(int key, int x, int y){
switch (key) {
case GLUT_KEY_UP: { cam.MoveForward(); break; }
case GLUT_KEY_DOWN: { cam.MoveBack(); break; }
case GLUT_KEY_LEFT: {cam.TurnLeft(); break; }
case GLUT_KEY_RIGHT: {cam.TurnRight(); break; }
}
cam.PrintPosition();
glutPostRedisplay();
}
void Idle(){
}```
【问题讨论】：
-
你最初是怎么想出这段代码的？
-
来自 YouTube 视频）
-
下载 Renderdoc，运行你的 gl 程序并捕获一个帧，然后查看一个帧是如何构造的以及使用了哪些资源。 Bam，就这样，你现在也是一个 opengl 调试器了。