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我正在为OpenGL中的天空盒设计环境地图，并遇到了纹理问题。我的代码生成我想要映射的纹理的贴图，而不是一个大纹理。瓷砖也失去了大部分的分辨率，而且非常小。OpenGL中的天空盒
这里是我的代码：
#include <windows.h>
#include <stdio.h>
#include <glew.h>
#include <glut.h>
#include "Camera.h"
Camera cam;
GLuint texture [6]; //the array for our texture
GLfloat angle = 0.0;
GLuint LoadTexture(const char * filename, int width, int height) {
GLuint texture;
unsigned char * data;
FILE* file;
file = fopen(filename, "rb");
if (file == NULL) return 0;
data = (unsigned char *)malloc(width * height * 3);
fread(data, width * height * 3, 1, file);
fclose(file);
glGenTextures(1, &texture);
glBindTexture(GL_TEXTURE_2D, texture);
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR_MIPMAP_LINEAR);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
gluBuild2DMipmaps(GL_TEXTURE_2D, 3, width, height, GL_RGB, GL_UNSIGNED_BYTE, data);
free(data);
return texture;
}
void FreeTexture(GLuint texture)
{
glDeleteTextures(1, &texture);
}
void skybox (void) {
float x = 0;
float y = 0;
float z = 0;
float width = 100;
float height = 100;
float length = 100;
// Bind the BACK texture of the sky map to the BACK side of the cube
glBindTexture(GL_TEXTURE_2D, texture[0]);
// Center the skybox
x = x - width/2;
y = y - height/2;
z = z - length/2;
glBegin(GL_QUADS);
glTexCoord2f(1.0f, 0.0f); glVertex3f(x + width, y, z);
glTexCoord2f(1.0f, 1.0f); glVertex3f(x + width, y + height, z);
glTexCoord2f(0.0f, 1.0f); glVertex3f(x, y + height, z);
glTexCoord2f(0.0f, 0.0f); glVertex3f(x, y, z);
glEnd();
glBindTexture(GL_TEXTURE_2D, texture[1]);
glBegin(GL_QUADS);
glTexCoord2f(1.0f, 0.0f); glVertex3f(x, y, z + length);
glTexCoord2f(1.0f, 1.0f); glVertex3f(x, y + height, z + length);
glTexCoord2f(0.0f, 1.0f); glVertex3f(x + width, y + height, z + length);
glTexCoord2f(0.0f, 0.0f); glVertex3f(x + width, y, z + length);
glEnd();
glBindTexture(GL_TEXTURE_2D, texture[4]);
glBegin(GL_QUADS);
glTexCoord2f(1.0f, 0.0f); glVertex3f(x, y, z);
glTexCoord2f(1.0f, 1.0f); glVertex3f(x, y, z + length);
glTexCoord2f(0.0f, 1.0f); glVertex3f(x + width, y, z + length);
glTexCoord2f(0.0f, 0.0f); glVertex3f(x + width, y, z);
glEnd();
glBindTexture(GL_TEXTURE_2D, texture[5]);
glBegin(GL_QUADS);
glTexCoord2f(0.0f, 0.0f); glVertex3f(x + width, y + height, z);
glTexCoord2f(1.0f, 0.0f); glVertex3f(x + width, y + height, z + length);
glTexCoord2f(1.0f, 1.0f); glVertex3f(x, y + height, z + length);
glTexCoord2f(0.0f, 1.0f); glVertex3f(x, y + height, z);
glEnd();
glBindTexture(GL_TEXTURE_2D, texture[2]);
glBegin(GL_QUADS);
glTexCoord2f(1.0f, 1.0f); glVertex3f(x, y + height, z);
glTexCoord2f(0.0f, 1.0f); glVertex3f(x, y + height, z + length);
glTexCoord2f(0.0f, 0.0f); glVertex3f(x, y, z + length);
glTexCoord2f(1.0f, 0.0f); glVertex3f(x, y, z);
glEnd();
glBindTexture(GL_TEXTURE_2D, texture[3]);
glBegin(GL_QUADS);
glTexCoord2f(0.0f, 0.0f); glVertex3f(x + width, y, z);
glTexCoord2f(1.0f, 0.0f); glVertex3f(x + width, y, z + length);
glTexCoord2f(1.0f, 1.0f); glVertex3f(x + width, y + height, z + length);
glTexCoord2f(0.0f, 1.0f); glVertex3f(x + width, y + height, z);
glEnd();
//glBindTexture(GL_TEXTURE_CUBE_MAP, texture[0]); //bind the texture
//glRotatef(angle, 1.0f, 1.0f, 1.0f);
//glutSolidSphere(2, 40, 40);
}
void display (void) {
glClearColor (0.0,0.0,0.0,1.0);
glClear (GL_COLOR_BUFFER_BIT);
glLoadIdentity();
cam.camera();
//gluLookAt (20.0, 20.0, 20.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0);
texture[0] = LoadTexture("Back.bmp", 256, 256); //load the texture
texture[1] = LoadTexture("Front.bmp", 256, 256); //load the texture
texture[2] = LoadTexture("Left.bmp", 256, 256); //load the texture
texture[3] = LoadTexture("Right.bmp", 256, 256); //load the texture
texture[4] = LoadTexture("Bottom.bmp", 256, 256); //load the texture
texture[5] = LoadTexture("Top.bmp", 256, 256); //load the texture
glEnable(GL_TEXTURE_2D); //enable 2D texturing
glEnable(GL_TEXTURE_GEN_S); //enable texture coordinate generation
glEnable(GL_TEXTURE_GEN_T);
skybox();
for (int i = 0; i < 6; i++) {
FreeTexture(texture[i]);
}
glutSwapBuffers();
angle = angle + 0.5;
cam.incAngle();
}
void keyboard (unsigned char key, int x, int y) {
switch (key) {
case 'q': cam.lookUpwards(); break;
case 'z': cam.lookDownwards(); break;
case 'w': cam.slideForward(); break;
case 's': cam.slideBackward(); break;
case 'a': cam.strafeLeft(); break;
case 'd': cam.strafeRight(); break;
case 'e': exit(0); break;
default: break;
}
}
void reshape(int x, int y) {
cam.reshape(x, y);
}
void mouseMovement(int x, int y) {
cam.mouseMovement(x, y);
}
int main (int argc, char **argv) {
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_DOUBLE);
glutInitWindowSize(500, 500);
glutInitWindowPosition(100, 100);
glutCreateWindow("A basic OpenGL Window");
glutDisplayFunc(display);
glutIdleFunc(display);
glutReshapeFunc(reshape);
glutKeyboardFunc(keyboard);
glutPassiveMotionFunc(mouseMovement);
glutMainLoop();
}
这是固定功能的OpenGL，这是相当过时。请考虑使用带着色器的可编程管线。 –
@StephanvandenHeuvel：请考虑回答实际问题，而不是建议OP不需要的东西。日期与否，固定功能即使在今天也有很多用途。制作GL4着色器只是为了绘制天空盒而已。 – SigTerm
这个问题为什么downvoted？ –