OpenGL输出无法正确使用图像显示纹理
[英]OpenGL Output Not Displaying Correctly using Image for Texture
问题描述
so I got an image as a texture for a square, but the problem is that whenever I run the code I get this: 
所以我得到一个图像作为正方形的纹理，但是问题是，每当我运行代码时，我都会得到：
But when I take this line out: 但是当我把这行代码删除时：
glTexImage2D(GL_TEXTURE_2D, 0, 3, image1->sizeX, image1->sizeY, 0, GL_RGB, GL_UNSIGNED_BYTE, image1->data);
Then I get this output (the white space is where I want to put the image as a texture): 然后我得到以下输出（空白是我要将图像作为纹理放置的位置）：
Or if I change the third parameter to 5, then I get this output. 或者，如果将第三个参数更改为5，则会得到此输出。 But I know that the texture does display correctly when I run the code below, but the output is still like the first image at the top. 但是我知道当我运行下面的代码时纹理可以正确显示，但是输出仍然像顶部的第一个图像一样。 How would I go about fixing the output so that it looks like the second image with the texture showing? 我将如何解决输出问题，使其看起来像第二个显示纹理的图像？ Note that the texture DOES display fine with my code, you just cant see it becuase it's hidden becuase the whole output wont display properly. 请注意，纹理在我的代码中无法正常显示，因为整个输出无法正确显示，您只是看不到它是因为它被隐藏了。
#include <GL/glut.h>
#include <iostream>
#include <unistd.h>
#include <math.h>
#include <GL/gl.h>
#include <opencv2/opencv.hpp> //for OpenCV 3.x
#include <opencv/highgui.h> //for OpenCV 3.x
#include <cstdio>
#include <stdlib.h>
#include <string.h>
#include <GL/glut.h>
#include <GL/gl.h>
#include <GL/glu.h>
#include <stdio.h>
#include <math.h>
#define UpperBD 80
#define PI 3.1415926
#define Num_pts 10
using namespace std;
float Xe = 200.0f;//100
float Ye = 300.0f;
float Ze = 450.0f;
float Rho = sqrt(pow(Xe,2) + pow(Ye,2) + pow(Ze,2));
float D_focal = 100.0f;
GLuint texture[2];
struct Image {
unsigned long sizeX;
unsigned long sizeY;
char *data;
};
typedef struct Image Image;
#define checkImageWidth 64
#define checkImageHeight 64
GLubyte checkImage[checkImageWidth][checkImageHeight][3];
void makeCheckImage(void){
int i, j, c;
for (i = 0; i < checkImageWidth; i++) {
for (j = 0; j < checkImageHeight; j++) {
c = ((((i&0x8)==0)^((j&0x8)==0)))*255;
checkImage[i][j][0] = (GLubyte) c;
checkImage[i][j][1] = (GLubyte) c;
checkImage[i][j][2] = (GLubyte) c;
}
}
}
int ImageLoad(char *filename, Image *image) {
FILE *file;
unsigned long size; // size of the image in bytes.
unsigned long i; // standard counter.
unsigned short int planes; // number of planes in image (must be 1)
unsigned short int bpp; // number of bits per pixel (must be 24)
char temp; // temporary color storage for bgr-rgb conversion.
// make sure the file is there.
if ((file = fopen(filename, "rb"))==NULL){
printf("File Not Found : %s\n",filename);
return 0;
}
// seek through the bmp header, up to the width/height:
fseek(file, 18, SEEK_CUR);
// read the width
if ((i = fread(&image->sizeX, 4, 1, file)) != 1) {
printf("Error reading width from %s.\n", filename);
return 0;
}
if ((i = fread(&image->sizeY, 4, 1, file)) != 1) {
printf("Error reading height from %s.\n", filename);
return 0;
}
size = image->sizeX * image->sizeY * 3;
// read the planes
if ((fread(&planes, 2, 1, file)) != 1) {
printf("Error reading planes from %s.\n", filename);
return 0;
}
if (planes != 1) {
printf("Planes from %s is not 1: %u\n", filename, planes);
return 0;
}
// read the bitsperpixel
if ((i = fread(&bpp, 2, 1, file)) != 1) {
printf("Error reading bpp from %s.\n", filename);
return 0;
}
if (bpp != 24) {
printf("Bpp from %s is not 24: %u\n", filename, bpp);
return 0;
}
// seek past the rest of the bitmap header.
fseek(file, 24, SEEK_CUR);
// read the data.
image->data = (char *) malloc(size);
if (image->data == NULL) {
printf("Error allocating memory for color-corrected image data");
return 0;
}
if ((i = fread(image->data, size, 1, file)) != 1) {
printf("Error reading image data from %s.\n", filename);
return 0;
}
for (i=0;i<size;i+=3) { // reverse all of the colors. (bgr -> rgb)
temp = image->data[i];
image->data[i] = image->data[i+2];
image->data[i+2] = temp;
}
// we're done.
return 1;
}
Image * loadTexture(){
Image *image1;
// allocate space for texture
image1 = (Image *) malloc(sizeof(Image));
if (image1 == NULL) {
printf("Error allocating space for image");
exit(0);
}
if (!ImageLoad("g.bmp", image1)) {
exit(1);
}
return image1;
}
void myinit(void)
//something in this function is making it not appear properly
{
// glClearColor (0.5, 0.5, 0.5, 0.0);
// glEnable(GL_DEPTH_TEST);
// glDepthFunc(GL_LESS);
Image *image1 = loadTexture();
// makeCheckImage();
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
// Create Texture
glGenTextures(2, texture);
glBindTexture(GL_TEXTURE_2D, texture[0]);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR); //scale linearly when image bigger than texture
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR); //scale linearly when image smalled than texture
glTexImage2D(GL_TEXTURE_2D, 0, 3, image1->sizeX, image1->sizeY, 0, GL_RGB, GL_UNSIGNED_BYTE, image1->data);
//above line causing problem
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL);
glBindTexture(GL_TEXTURE_2D, texture[1]);
// glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
// glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
// glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
// glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
// glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL);
// glTexImage2D(GL_TEXTURE_2D, 0, 3, checkImageWidth, checkImageHeight, 0, GL_RGB, GL_UNSIGNED_BYTE,&checkImage[0][0][0]);
glEnable(GL_TEXTURE_2D);
// glShadeModel(GL_FLAT);
}
typedef struct {
float X[UpperBD];
float Y[UpperBD];
float Z[UpperBD];
} pworld;
typedef struct {
float X[UpperBD];
float Y[UpperBD];
float Z[UpperBD];
} pviewer;
typedef struct{
float X[UpperBD];
float Y[UpperBD];
} pperspective;
typedef struct{
float X[UpperBD];
float Y[UpperBD];
} pattern2DL;
typedef struct{
float X[UpperBD];
float Y[UpperBD];
} arrowpoint;
typedef struct {
float r[UpperBD], g[UpperBD], b[UpperBD];
} pt_diffuse;
void mydisplay()
{
// define x-y coordinate
float p1x=-1.0f, p1y= 0.0f;
float p2x= 1.0f, p2y= 0.0f;
float p3x= 0.0f, p3y= 1.0f;
float p4x= 0.0f, p4y=-1.0f;
glClear(GL_COLOR_BUFFER_BIT);
glLoadIdentity();
pworld world;
pviewer viewer;
pperspective perspective;
pattern2DL letterL;
arrowpoint arrow;
//define the x-y-z world coordinate
world.X[0] = 0.0; world.Y[0] = 0.0; world.Z[0] = 0.0; // origin
world.X[1] = 50.0; world.Y[1] = 0.0; world.Z[1] = 0.0; // x-axis
world.X[2] = 0.0; world.Y[2] = 50.0; world.Z[2] = 0.0; // y-axis
world.X[3] = 0.0; world.Y[3] = 0.0; world.Z[3] = 50.0; // y-axis
//define projection plane world coordinate , THIS IS THE SQUARE AROUND THE LETTERS
world.X[4] = 60.0; world.Y[4] = -50.0; world.Z[4] = 0.0;
world.X[5] = 60.0; world.Y[5] = 50.0; world.Z[5] = 0.0; // base line
world.X[7] = 60.0; world.Y[7] = -50.0; world.Z[7] = 100.0; // side bar
world.X[6] = 60.0; world.Y[6] = 50.0; world.Z[6] = 100.0; // side bar
//define 2D pattern letter A
letterL.X[0] = -10.0; letterL.Y[0] = 10.0;
letterL.X[1] = -15.0; letterL.Y[1] = 10.0;
letterL.X[2] = -20.0; letterL.Y[2] = 30.0;
letterL.X[3] = -40.0; letterL.Y[3] = 30.0;
letterL.X[4] = -45.0; letterL.Y[4] = 10.0;
letterL.X[5] = -50.0; letterL.Y[5] = 10.0;
letterL.X[6] = -37.0; letterL.Y[6] = 70.0;
letterL.X[7] = -23.0; letterL.Y[7] = 70.0;
letterL.X[8] = -25.0; letterL.Y[8] = 40.0;
letterL.X[9] = -35.0; letterL.Y[9] = 40.0;
letterL.X[10] = -30.0; letterL.Y[10] = 60.0;
//letter B
letterL.X[11] = 10.0; letterL.Y[11] = 10.0;
letterL.X[12] = 10.0; letterL.Y[12] = 70.0;
letterL.X[13] = 20.0; letterL.Y[13] = 10.0;
letterL.X[14] = 20.0; letterL.Y[14] = 70.0;
letterL.X[15] = 20.0; letterL.Y[15] = 60.0;
letterL.X[16] = 20.0; letterL.Y[16] = 45.0;
letterL.X[17] = 20.0; letterL.Y[17] = 35.0;
letterL.X[18] = 20.0; letterL.Y[18] = 20.0;
letterL.X[19] = 25.0; letterL.Y[19] = 58.0;
letterL.X[20] = 27.0; letterL.Y[20] = 56.0;
letterL.X[21] = 28.0; letterL.Y[21] = 52.0;
letterL.X[22] = 27.0; letterL.Y[22] = 49.0;
letterL.X[23] = 25.0; letterL.Y[23] = 47.0;
letterL.X[24] = 25.0; letterL.Y[24] = 33.0;
letterL.X[25] = 27.0; letterL.Y[25] = 31.0;
letterL.X[26] = 28.0; letterL.Y[26] = 27.0;
letterL.X[27] = 27.0; letterL.Y[27] = 24.0;
letterL.X[28] = 25.0; letterL.Y[28] = 22.0;
letterL.X[29] = 30.0; letterL.Y[29] = 65.0;
letterL.X[30] = 34.0; letterL.Y[30] = 60.0;
letterL.X[31] = 34.0; letterL.Y[31] = 50.0;
letterL.X[32] = 30.0; letterL.Y[32] = 45.0;
letterL.X[33] = 25.0; letterL.Y[33] = 40.0;
letterL.X[34] = 30.0; letterL.Y[34] = 38.0;
letterL.X[35] = 34.0; letterL.Y[35] = 30.0;
letterL.X[36] = 34.0; letterL.Y[36] = 20.0;
letterL.X[37] = 30.0; letterL.Y[37] = 15.0;
arrow.X[0] = 0.0; arrow.Y[0] = 25.0;
arrow.X[1] = 0.0; arrow.Y[1] = 75.0;
arrow.X[2] = 60.0; arrow.Y[2] = 75.0;
arrow.X[3] = 60.0; arrow.Y[3] = 85.0;
arrow.X[4] = 90.0; arrow.Y[4] = 50.0;
arrow.X[5] = 60.0; arrow.Y[5] = 15.0;
arrow.X[6] = 60.0; arrow.Y[6] = 25.0;
arrow.X[7] = 0.0; arrow.Y[7] = 25.0;
arrow.X[8] = 0.0; arrow.Y[8] = 75.0;
arrow.X[9] = 60.0; arrow.Y[9] = 75.0;
arrow.X[10] = 60.0; arrow.Y[10] = 85.0;
arrow.X[11] = 90.0; arrow.Y[11] = 50.0;
arrow.X[12] = 60.0; arrow.Y[12] = 15.0;
arrow.X[13] = 60.0; arrow.Y[13] = 25.0;
//decoration
for(int i = 0; i <= 37; i++)
{
world.X[8+i] = 60.0;
world.Y[8+i] = letterL.X[i];
world.Z[8+i] = letterL.Y[i];
}
//arrow
for(int j = 0; j <= 6; j++)
{
world.X[46+j] = arrow.X[j]-50;//-50
world.Y[46+j] = arrow.Y[j];
world.Z[46+j] = 100.0;//CHANGE TO 150?
}
for(int k = 0; k <= 6; k++)
{
world.X[53+k] = arrow.X[k]-50;
world.Y[53+k] = arrow.Y[k];
world.Z[53+k] = 110.0;//CHANGE TO 150?
}
float sPheta = Ye / sqrt(pow(Xe,2) + pow(Ye,2));
float cPheta = Xe / sqrt(pow(Xe,2) + pow(Ye,2));
float sPhi = sqrt(pow(Xe,2) + pow(Ye,2)) / Rho;
float cPhi = Ze / Rho;
float xMin = 1000.0, xMax = -1000.0;
float yMin = 1000.0, yMax = -1000.0;
//47 is normal vector 46 is a, 45 is ps, 7 is top left box vertex
//COMUTER SHADE OF FLOATING ARROW DUE NEXT WEEK
world.X[60] = -200.0; world.Y[60]=50.0; world.Z[60]=200.0;//ps
world.X[61] = 0.0; world.Y[61]=0.0; world.Z[61]=0.0;//vector a
world.X[62] = 0.0; world.Y[62]=0.0; world.Z[62]=1.0;//VECTOR N
float tmp = (world.X[62]*(world.X[61]-world.X[60]))
+(world.Y[62]*(world.Y[61]-world.Y[60]))
+(world.Z[62]*(world.Z[61]-world.Z[60]));
cout << tmp;
float lambda = tmp/((world.X[62]*(world.X[60]-world.X[7]))
+(world.Y[62]*(world.Y[60]-world.Y[7]))
+(world.Z[62]*(world.Z[60]-world.Z[7])));
cout << lambda;
float lambda_2 = tmp/((world.X[62]*(world.X[60]-world.X[6]))//MAKE ARROW HIGHER, ABOVE PROJECTION PLANE SQUARE
+(world.Y[62]*(world.Y[60]-world.Y[6]))
+(world.Z[62]*(world.Z[60]-world.Z[6])));
cout << lambda_2;
world.X[63] = world.X[60]+lambda*(world.X[60]-world.X[7]);//interseciton point for p7, X COMP
world.Y[63] = world.Y[60]+lambda*(world.Y[60]-world.Y[7]);//Y COMP
world.Z[63] = 0.0;
world.X[64] = world.X[60]+lambda_2*(world.X[60]-world.X[6]);//interseciton point for p7, X COMP
world.Y[64] = world.Y[60]+lambda_2*(world.Y[60]-world.Y[6]);//Y COMP
world.Z[64] = 0.0;
//for arrow's shade, 46-52
float lambda_arrow1 = tmp/((world.X[62]*(world.X[60]-world.X[46]))
+(world.Y[62]*(world.Y[60]-world.Y[46]))
+(world.Z[62]*(world.Z[60]-world.Z[46])));
float lambda_arrow2 = tmp/((world.X[62]*(world.X[60]-world.X[47]))//MAKE ARROW HIGHER, ABOVE PROJECTION PLANE SQUARE
+(world.Y[62]*(world.Y[60]-world.Y[47]))
+(world.Z[62]*(world.Z[60]-world.Z[47])));
float lambda_arrow3 = tmp/((world.X[62]*(world.X[60]-world.X[48]))
+(world.Y[62]*(world.Y[60]-world.Y[48]))
+(world.Z[62]*(world.Z[60]-world.Z[48])));
float lambda_arrow4 = tmp/((world.X[62]*(world.X[60]-world.X[49]))
+(world.Y[62]*(world.Y[60]-world.Y[49]))
+(world.Z[62]*(world.Z[60]-world.Z[49])));
float lambda_arrow5 = tmp/((world.X[62]*(world.X[60]-world.X[50]))
+(world.Y[62]*(world.Y[60]-world.Y[50]))
+(world.Z[62]*(world.Z[60]-world.Z[50])));
float lambda_arrow6 = tmp/((world.X[62]*(world.X[60]-world.X[51]))
+(world.Y[62]*(world.Y[60]-world.Y[51]))
+(world.Z[62]*(world.Z[60]-world.Z[51])));
float lambda_arrow7 = tmp/((world.X[62]*(world.X[60]-world.X[52]))
+(world.Y[62]*(world.Y[60]-world.Y[52]))
+(world.Z[62]*(world.Z[60]-world.Z[52])));
world.X[65] = world.X[60]+lambda_arrow1*(world.X[60]-world.X[46]);//interseciton point for p7, X COMP
world.Y[65] = world.Y[60]+lambda_arrow1*(world.Y[60]-world.Y[46]);//Y COMP
world.Z[65] = 0.0;
world.X[66] = world.X[60]+lambda_arrow2*(world.X[60]-world.X[47]);//interseciton point for p7, X COMP
world.Y[66] = world.Y[60]+lambda_arrow2*(world.Y[60]-world.Y[47]);//Y COMP
world.Z[66] = 0.0;
world.X[67] = world.X[60]+lambda_arrow3*(world.X[60]-world.X[48]);//interseciton point for p7, X COMP
world.Y[67] = world.Y[60]+lambda_arrow3*(world.Y[60]-world.Y[48]);//Y COMP
world.Z[67] = 0.0;
world.X[68] = world.X[60]+lambda_arrow4*(world.X[60]-world.X[49]);//interseciton point for p7, X COMP
world.Y[68] = world.Y[60]+lambda_arrow4*(world.Y[60]-world.Y[49]);//Y COMP
world.Z[68] = 0.0;
world.X[69] = world.X[60]+lambda_arrow5*(world.X[60]-world.X[50]);//interseciton point for p7, X COMP
world.Y[69] = world.Y[60]+lambda_arrow5*(world.Y[60]-world.Y[50]);//Y COMP
world.Z[69] = 0.0;
world.X[70] = world.X[60]+lambda_arrow6*(world.X[60]-world.X[51]);//interseciton point for p7, X COMP
world.Y[70] = world.Y[60]+lambda_arrow6*(world.Y[60]-world.Y[51]);//Y COMP
world.Z[70] = 0.0;
world.X[71] = world.X[60]+lambda_arrow7*(world.X[60]-world.X[52]);//interseciton point for p7, X COMP
world.Y[71] = world.Y[60]+lambda_arrow7*(world.Y[60]-world.Y[52]);//Y COMP
world.Z[71] = 0.0;
// -----------diffuse reflection-----------*
pt_diffuse diffuse; //diffuse.r[3]
//-------reflectivity coefficient-----------*
#define Kdr 0.8
#define Kdg 0.0
#define Kdb 0.0
// define additional pts to find diffuse reflection
//world.X[49] = world.X[45] + lambda_2*(world.X[45] - world.X[6]);
//--------compute distance------------------*//change 45 to 60!!!!!!
float distance[UpperBD];
for (int i=63; i<=71; i++) {
distance[i] = sqrt(pow((world.X[i]-world.X[60]),2)+ //intersect pt p7
pow((world.Y[i]-world.Y[60]),2)+
pow((world.X[i]-world.X[60]),2) );
//std::cout << "distance[i] " << distance[i] << std::endl;
}
// for (int i=4; i<=5; i++){
// distance[i] = sqrt(pow((world.X[i]-world.X[60]),2)+ //pt p4 of projection plane
// pow((world.Y[i]-world.Y[60]),2)+
// pow((world.X[i]-world.X[60]),2) );
// //std::cout << "distance[i] " << distance[i] << std::endl;
// }
//--------compute angle---------------------*
float angle[UpperBD], tmp_dotProd[UpperBD], tmp_mag_dotProd[UpperBD];
for (int i=63; i<=71; i++){
tmp_dotProd[i] = world.Z[i]-world.X[60];
std::cout << " tmp_dotProd[i] " << tmp_dotProd[i] << std::endl;
tmp_mag_dotProd[i] = sqrt(pow((world.X[i]-world.X[60]),2)+ //[45] pt light source
pow((world.Y[i]-world.Y[60]),2)+
pow((world.Z[i]-world.Z[60]),2) );
std::cout << " tmp_mag_dotProd[i] 1 " << tmp_mag_dotProd[i] << std::endl;
angle[i] = tmp_dotProd[i]/ tmp_mag_dotProd[i];
std::cout << "angle[i] " << angle[i] << std::endl;
//compute color intensity
diffuse.r[i] = Kdr * angle[i] / pow(distance[i],2) ;
diffuse.g[i] = Kdg * angle[i] / pow(distance[i],2) ;
diffuse.b[i] = Kdb * angle[i] / pow(distance[i],2) ;
}
// for (int i=4; i<=5; i++){
//
// tmp_dotProd[i] = world.Z[i]-world.X[45];
// std::cout << " tmp_dotProd[i] " << tmp_dotProd[i] << std::endl;
//
// tmp_mag_dotProd[i] = sqrt(pow((world.X[i]-world.X[45]),2)+ //[45] pt light source
// pow((world.Y[i]-world.Y[45]),2)+
// pow((world.Z[i]-world.Z[45]),2) );
// std::cout << " tmp_mag_dotProd[i] 1 " << tmp_mag_dotProd[i] << std::endl;
//
// angle[i] = tmp_dotProd[i]/ tmp_mag_dotProd[i];
// std::cout << "angle[i] " << angle[i] << std::endl;
//
// //compute color intensity
// diffuse.r[i] = Kdr * angle[i] / pow(distance[i],2) ;
// diffuse.g[i] = Kdg * angle[i] / pow(distance[i],2) ;
// diffuse.b[i] = Kdb * angle[i] / pow(distance[i],2) ;
//
// //std::cout << "diffuse.r[i] " << diffuse.r[i] << std::endl;
// //std::cout << "diffuse.g[i] " << diffuse.g[i] << std::endl;
// }
//
for(int i = 0; i < UpperBD; i++)
{
viewer.X[i] = -sPheta * world.X[i] + cPheta * world.Y[i];
viewer.Y[i] = -cPheta * cPhi * world.X[i]
- cPhi * sPheta * world.Y[i]
+ sPhi * world.Z[i];
viewer.Z[i] = -sPhi * cPheta * world.X[i]
- sPhi * cPheta * world.Y[i]
-cPheta * world.Z[i] + Rho;
// cout << i;
}
for(int i = 0; i <= UpperBD; i++)
{
perspective.X[i] = D_focal * viewer.X[i] / viewer.Z[i] ;
perspective.Y[i] = D_focal * viewer.Y[i] / viewer.Z[i] ;
if (perspective.X[i] > xMax) xMax = perspective.X[i];
if (perspective.X[i] < xMin) xMin = perspective.X[i];
if (perspective.Y[i] > yMax) yMax = perspective.Y[i];
if (perspective.Y[i] < yMin) yMin = perspective.Y[i];
/////*
//std::cout << "xMin " << xMin << std::endl;
// std::cout << "xMax " << xMax << std::endl;
// std::cout << "yMin " << yMin << std::endl;
// std::cout << "yMax " << yMax << std::endl;
//*/
}
for(int i = 0; i <= UpperBD; i++)
{
if ((xMax-xMin) != 0) perspective.X[i] = perspective.X[i]/(xMax-xMin);
if ((yMax-yMin) != 0) perspective.Y[i] = perspective.Y[i]/(yMax-yMin);
std::cout << i << perspective.X[i] << perspective.Y[i] << std::endl;
}
glViewport(0,0,1550,1250);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glBegin(GL_LINES);
glClear(GL_COLOR_BUFFER_BIT);
glColor3f(1.0, 0.0, 0.0);
glVertex2f(perspective.X[0],perspective.Y[0]);
glVertex2f(perspective.X[1],perspective.Y[1]);
glColor3f(0.0, 1.0, 0.0);
glVertex2f(perspective.X[0],perspective.Y[0]);
glVertex2f(perspective.X[2],perspective.Y[2]);
glColor3f(0.0, 0.0, 1.0);
glVertex2f(perspective.X[0],perspective.Y[0]);
glVertex2f(perspective.X[3],perspective.Y[3]);
glColor3f(1.0, 1.0, 0.0); // projection plane , square
glVertex2f(perspective.X[4],perspective.Y[4]);
glVertex2f(perspective.X[5],perspective.Y[5]);
glVertex2f(perspective.X[4],perspective.Y[4]);
glVertex2f(perspective.X[7],perspective.Y[7]);
glVertex2f(perspective.X[5],perspective.Y[5]);
glVertex2f(perspective.X[6],perspective.Y[6]);
glVertex2f(perspective.X[6],perspective.Y[6]);
glVertex2f(perspective.X[7],perspective.Y[7]);
glEnd();
glColor3f(0.0, 1.0, 0.0); // LETTER A STARTS HERE
glBegin(GL_POLYGON);
glVertex2f(perspective.X[13],perspective.Y[13]);
glVertex2f(perspective.X[12],perspective.Y[12]);
glVertex2f(perspective.X[11],perspective.Y[11]);
glVertex2f(perspective.X[12],perspective.Y[12]);
glVertex2f(perspective.X[14],perspective.Y[14]);
glVertex2f(perspective.X[13],perspective.Y[13]);
glVertex2f(perspective.X[18],perspective.Y[18]);
glVertex2f(perspective.X[17],perspective.Y[17]);
glVertex2f(perspective.X[11],perspective.Y[11]);
glVertex2f(perspective.X[17],perspective.Y[17]);
glVertex2f(perspective.X[18],perspective.Y[18]);
glVertex2f(perspective.X[14],perspective.Y[14]);
glEnd();
glColor3f(0.0, 1.0, 0.0);
glBegin(GL_POLYGON);
glVertex2f(perspective.X[8],perspective.Y[8]);
glVertex2f(perspective.X[15],perspective.Y[15]);
glVertex2f(perspective.X[14],perspective.Y[14]);
glVertex2f(perspective.X[15],perspective.Y[15]);
glVertex2f(perspective.X[14],perspective.Y[14]);
glVertex2f(perspective.X[18],perspective.Y[18]);
glVertex2f(perspective.X[16],perspective.Y[16]);
glVertex2f(perspective.X[18],perspective.Y[18]);
glVertex2f(perspective.X[16],perspective.Y[16]);
glVertex2f(perspective.X[10],perspective.Y[10]);
glVertex2f(perspective.X[9],perspective.Y[9]);
glVertex2f(perspective.X[10],perspective.Y[10]);
glVertex2f(perspective.X[8],perspective.Y[8]);
glVertex2f(perspective.X[9],perspective.Y[9]);
glEnd();
glColor3f(0.0, 1.0, 0.0);
glBegin(GL_POLYGON);
glVertex2f(perspective.X[16],perspective.Y[16]);
glVertex2f(perspective.X[17],perspective.Y[17]);
//etc...
glEnd();
glColor3f(0.0, 1.0, 0.0); //LETTER B STARTS HERE
glBegin(GL_POLYGON);
glVertex2f(perspective.X[19],perspective.Y[19]);
glVertex2f(perspective.X[20],perspective.Y[20]);
//etc...
glEnd();
glColor3f(0.0, 1.0, 0.0);
glBegin(GL_LINES);
//
glVertex2f(perspective.X[23],perspective.Y[23]);
glVertex2f(perspective.X[24],perspective.Y[24]);
glVertex2f(perspective.X[25],perspective.Y[25]);
glVertex2f(perspective.X[26],perspective.Y[26]);
glEnd();
glColor3f(0.0, 1.0, 0.0);
glBegin(GL_POLYGON);
glVertex2f(perspective.X[27],perspective.Y[27]);
glVertex2f(perspective.X[28],perspective.Y[28]);
//etc...
glEnd();
glColor3f(0.0, 1.0, 0.0);
glBegin(GL_POLYGON);
glVertex2f(perspective.X[29],perspective.Y[29]);
glVertex2f(perspective.X[30],perspective.Y[30]);
//etc...
glEnd();
glColor3f(0.0, 1.0, 0.0);
glBegin(GL_POLYGON);
glVertex2f(perspective.X[24],perspective.Y[24]);
glVertex2f(perspective.X[41],perspective.Y[41]);
//etc...
glEnd();
glColor3f(0.0, 1.0, 0.0);
glColor3f(1.0, 0.0, 0.0);
glBegin(GL_LINES);//3D arrow starts here
glVertex2f(perspective.X[46],perspective.Y[46]);
glVertex2f(perspective.X[47],perspective.Y[47]);
//etc...
glEnd(); //end arrow
glColor3f(1.0, 1.0, 0.0);
glBegin(GL_LINES);
glVertex2f(perspective.X[63],perspective.Y[63]);
glVertex2f(perspective.X[64],perspective.Y[64]);
//etc...
glEnd(); //end arrow
glColor3f(1.0, 0.0, 0.0);
glBegin(GL_LINES);
//arrow shadow
glVertex2f(perspective.X[65],perspective.Y[65]);
glVertex2f(perspective.X[66],perspective.Y[66]);
//etc...
glEnd();
glBindTexture(GL_TEXTURE_2D, texture[1]);
// glutSolidTeapot(0.1);
glBindTexture(GL_TEXTURE_2D, texture[0]);
glEnable( GL_TEXTURE_2D );
glColor4f( 1.0f, 1.0f, 1.0f, 1.0f );
glBegin(GL_QUADS);
glVertex2f(perspective.X[4],perspective.Y[4]);
glTexCoord2f(0.0, 0.0);
glVertex2f(perspective.X[5],perspective.Y[5]);
glTexCoord2f(0.1, 0.0);
glVertex2f(perspective.X[4],perspective.Y[4]);
glTexCoord2f(0.1, 0.1);
glVertex2f(perspective.X[7],perspective.Y[7]);
glTexCoord2f(0.0, 0.1);
glVertex2f(perspective.X[5],perspective.Y[5]);
glVertex2f(perspective.X[6],perspective.Y[6]);
glVertex2f(perspective.X[6],perspective.Y[6]);
glVertex2f(perspective.X[7],perspective.Y[7]);
glEnd();
glDisable( GL_TEXTURE_2D );
//glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
#define display_scaling 200000.0
#define display_shifting 0.2
for (int i=63; i<=71; i++) {
float r, g, b;
r = display_scaling*diffuse.r[i]+display_shifting;
//r = display_scaling*diffuse.r[i];
g = diffuse.g[i]; b = diffuse.b[i] ;
glColor3f(r, g, b);
std::cout << "display_scaling*diffuse.r[i] " << r << std::endl;
glBegin(GL_POLYGON);
glVertex2f(perspective.X[i],perspective.Y[i]);
glVertex2f(perspective.X[i]+0.1,perspective.Y[i]);
glVertex2f(perspective.X[i]+0.1,perspective.Y[i]+0.1);
glVertex2f(perspective.X[i],perspective.Y[i]+0.1);
glEnd();
}
gluPerspective(45.0,0.5,1.0,60.0);
gluOrtho2D(5, 10, 0.0, 10);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glutSwapBuffers();
glFlush();
//sleep(5);
}
int main(int argc, char** argv)
{
cv::Mat image = cv::imread("b.jpg", CV_LOAD_IMAGE_COLOR);
glutInit(&argc,argv);
glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB );
glutInitWindowSize(900, 1000);
glutCreateWindow("lab");
//imshow( "lab", image );
glutDisplayFunc(mydisplay);
myinit();
glutMainLoop();
}
1 个解决方案
解决方案1
3 已采纳 2018-12-16 11:52:30
glEnable(GL_TEXTURE_2D) has to be removed from myinit , because it is done immediately before the object with the texture is drawn. 必须从myinit删除glEnable(GL_TEXTURE_2D) ，因为它是在绘制带有纹理的对象之前立即完成的。
Further use the STB library , which can be found at GitHub - nothings/stb to load the bitmap: 进一步使用STB库 ，该库可在GitHub上找到-nones / stb加载位图：
#define STB_IMAGE_IMPLEMENTATION
#include <stb_image.h>
void myinit(void)
{
glGenTextures(2, texture);
int cx, cy, ch;
stbi_uc *img = stbi_load("g.bmp", &cx, &cy, &ch, 3);
if (!img)
return;
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
glBindTexture(GL_TEXTURE_2D, texture[0]);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR);
glTexImage2D(GL_TEXTURE_2D, 0, 3, cx, cy, 0, GL_RGB, GL_UNSIGNED_BYTE, img);
stbi_image_free( img );
// ....
}
The number of vertex coordinates is UpperBD , so the maximum index is UpperBD-1 or < UpperBD , but not <= UpperBD . 顶点坐标数为UpperBD ，因此最大索引为UpperBD-1或< UpperBD ，但不<= UpperBD 。
Change (2 times): 更改（2次）：
for(int i = 0; i <= UpperBD; i++)
for(int i = 0; i < UpperBD; i++)
gluPerspective and gluOrtho2D at once makes no sense at all. 一次使用gluPerspective和gluOrtho2D根本没有任何意义。
Init the projection matrix and the model view matrix at the begin of each frame in mydisplay : 在mydisplay中每帧的开头初始化投影矩阵和模型视图矩阵：
void mydisplay()
{
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(45.0,0.5,1.0,60.0);
//gluOrtho2D(5, 10, 0.0, 10);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glClear(GL_COLOR_BUFFER_BIT);
.....
}
When the vertex coordinate is set by glVertex the current texture coordinates, and is associated with the vertex coordinate. 通过glVertex设置顶点坐标时，当前纹理坐标将与该顶点坐标关联。 This means glTexCoord has to be dine before glVertex . 这意味着glTexCoord必须在glVertex之前就餐。 A GL_QUAD primitive consitis of 4 vertices and each vertex coordinate needs its own texture coordinate: 一个GL_QUAD 4个顶点的原始连续体，每个顶点坐标需要其自己的纹理坐标：
glBindTexture(GL_TEXTURE_2D, texture[0]);
glEnable( GL_TEXTURE_2D );
glColor4f( 1.0f, 1.0f, 1.0f, 1.0f );
glBegin(GL_QUADS);
glTexCoord2f(0.0, 0.0);
glVertex2f(perspective.X[4],perspective.Y[4]);
glTexCoord2f(1.0, 0.0);
glVertex2f(perspective.X[5],perspective.Y[5]);
glTexCoord2f(1.0, 1.0);
glVertex2f(perspective.X[6],perspective.Y[6]);
glTexCoord2f(0.0, 1.0);
glVertex2f(perspective.X[7],perspective.Y[7]);
glEnd();
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