[英]Having trouble loading in multiple .bmp files for textures OpenGL C++
嘗試將.bmp文件放入數組時遇到了一些麻煩，因此我可以將它們用於紋理。
編輯
顯示.h
#pragma once
#include "Ball.h"
#include "Bitmap.h"
class Display
{
private :
static Bitmap m_HeightMap;
static unsigned int textures;
// static float TableX, TableY, TableZ;
static float eyeZ, eyeY, eyeX;
static float lightX, lightY, lightZ;
static float Position[4];
static float translateZ, translateX;
//static Timer m_Timer;
public:
static void Init(int argc, char ** argv);
static void DisplayScene();
static void Resize(int w, int h);
static void KeyboardInput(unsigned char pKey, int pX, int pY);
static void Idle();
static void DrawLight(int pLightNumber, float * pPos);
static void Table(float zStart, float xStart, float zEnd, float xEnd);
static void BallCollisions(float pTimestep, Vector3f New_position, Vector3f New_velocity);
};
void main(int argc, char ** argv)
{
Display::Init(argc, argv);
}
Display.cpp
#include "Display.h"
#include "Vector3f.h"
#include "Ball.h"
#include "Glut/glut.h"
#include "GL/gl.h"
#include "GL/glu.h"
#include <math.h>
#include "Bitmap.h"
static float TableWidth = 4; // Z axis normal = 4
float Display::eyeX = -7.5; //-7.5
float Display::eyeY = 3; //3
float Display::eyeZ = 5; //5
float Display::Position[4] = { 1.0f, 0.0f, -3.5, 1.0f };
float Display::translateZ = -3.5;
float Display::translateX = 0.0;
//Timer Display::m_Timer = Timer();
float Display::lightX = 5.0; //5 2.5
float Display::lightY = 5.0;
float Display::lightZ = 2.5;
float m_TableX = -5.0f;
float m_TableZ = -2.5f;
float m_TableWidth = 2.5f;
float m_TableLength = 5.0f;
float ballx = 0.7;
float bally = 0.1;
float ballz = -0.7;
Ball Redball;
float BALL_RED_START = 0;
float RADIUS_OF_BALL = 0.3;
float BALL_RED_END = 8;
Ball Yellowball;
float BALL_YELLOW_START = 0;
float BALL_YELLOW_END = 8;
Bitmap Display::m_HeightMap;
unsigned int Display:: textures;
GLuint textures[2];
void loadTexture(GLuint texture, const char* filename)
{
Bitmap image;
Bitmap image[2];
image[0].loadBMP("myTexture.bmp");
image[1].loadBMP("myTexture2.bmp");
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_NEAREST);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_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, image.width, image.height, GL_RGB, GL_UNSIGNED_BYTE, image.data);
}
void Display::Init(int argc, char ** argv)
{
glutInit(&argc, argv); // initializes glut
// sets display mode. These parameter set RGB colour model
// and double buffering.
glutInitWindowSize(500,500);
glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE);
glutCreateWindow("Pool Version 1.0");
// Set glut callback functions
glutDisplayFunc(Display::DisplayScene);
glutIdleFunc(Display::Idle);
glutReshapeFunc(Display::Resize);
glutKeyboardFunc(Display::KeyboardInput);
//m_Timer.getSeconds();
glEnable(GL_DEPTH_TEST);
glPointSize(5);
glEnable(GL_NORMALIZE);
glEnable(GL_LIGHTING);
glClearColor(0,0,0,1);
glEnable(GL_COLOR_MATERIAL);
float white[] = { 1.0f, 1.0f, 1.0f, 1.0f };
glLightfv(GL_LIGHT0, GL_DIFFUSE, white);
glEnable(GL_LIGHT0);
Redball.SetPos(Vector3f(0.0,0.3,0.0));
Ball Redball[8];
for(int i = BALL_RED_START; i < BALL_RED_START; i++)
{
glColor3f(1,0,0);
Redball[i].SetPos(Vector3f (i+128,RADIUS_OF_BALL,45));
}
Ball Yellowball[8];
for(int i = BALL_YELLOW_START; i < BALL_YELLOW_START; i++)
{
glColor3f(2,1,0);
Yellowball[i].SetPos(Vector3f (i+128,RADIUS_OF_BALL,45));
}
GLuint *textures = new GLuint[2];
glGenTextures(2, textures);
loadTexture(textures[0], "myTexture.bmp");
loadTexture(textures[1], "myTexture2.bmp");
// Begin glut main loop
glutMainLoop();
}
#pragma region Table Drawing Code
void drawTable()
{
glBegin(GL_QUADS); // RIGHT
glNormal3f(0,0,1);
glEnable(GL_TEXTURE_2D);
//glColor3d(0.5,0.35,0.05);
glColor4f(1,1,1,0);
glTexCoord2f(0.0f,0.0f);
glVertex3f(m_TableX, 0.0f, m_TableWidth); //bottom left
glTexCoord2f(1.0f,0.0f);
glVertex3f(m_TableLength, 0.0f, m_TableWidth);//bottom right
glTexCoord2f(1.0f,1.0f);
glVertex3f(m_TableLength, 0.0f, m_TableWidth);//top right
glTexCoord2f(0.0f,1.0f);
glVertex3f(m_TableX, 0.0f, m_TableWidth); //top left
glEnd();
glBegin(GL_QUADS); //BACK
glNormal3f(1,0,0);
glEnable(GL_TEXTURE_2D);
glColor4f(1,1,1,0);
//glColor3d(0.5,0.35,0.05);
glTexCoord2f(0.0f,0.0f);
glVertex3f(m_TableLength, 0.0f, m_TableWidth);
glTexCoord2f(1.0f,0.0f);
glVertex3f(m_TableLength, 0.0f, m_TableZ);
glTexCoord2f(1.0f,1.0f);
glVertex3f(m_TableLength, 0.0f, m_TableZ);
glTexCoord2f(0.0f,1.0f);
glVertex3f(m_TableLength, 0.0f, m_TableWidth);
glEnd();
glBegin(GL_QUADS); //FRONT
glNormal3f(-1,0,0);
//glColor3d(0.5,0.35,0.05);
glVertex3f(m_TableX, 0.0f, m_TableZ);
glVertex3f(m_TableX, 0.0f, m_TableWidth);
glVertex3f(m_TableX, 0.0f, m_TableWidth);
glVertex3f(m_TableX, 0.0f, m_TableZ);
glEnd();
glBegin(GL_QUADS); //lEFT
glNormal3f(0,0,-1);
glColor3d(0.5,0.35,0.05);
glVertex3f(m_TableX, 0.0f, m_TableZ);
glVertex3f(m_TableLength, 0.0f, m_TableZ);
glVertex3f(m_TableX, 0.0f, m_TableZ);
glVertex3f(m_TableLength, 0.0f, m_TableZ);
glEnd();
glBegin(GL_QUADS); //BOTTOM
glNormal3f(0,-1,0);
glColor3d(0.5,0.35,0.05);
glVertex3f(m_TableX, -0.001f, m_TableWidth);
glVertex3f(m_TableLength, -0.001f, m_TableWidth);
glVertex3f(m_TableLength, -0.001f, m_TableZ);
glVertex3f(m_TableX, -0.001f, m_TableZ);
glEnd();
}
#pragma endregion
#pragma region Cushion Drawing Code
// width 0.5 = dividing table width (5) by 9 to get the proportional size of 10cm
// height 0.3 = dividing the width by 10 to find the value of 1cm = 0.05. 0.05 x 6 = 0.3
// starting at 0.4 to leave for the pocket. (1cm x 8 = pocket size = 0.05 x 8 = 0.4)
//right cushion
void drawCushions()
{
glBegin(GL_QUADS); //BOTTOM
glNormal3f(0,-1,0);
glColor3d(0.5,0.40,0.05);
glVertex3f(-4.5, 0.01, 2);//bottom left
glVertex3f(-4.5, 0.01, 2.5);//bottom right
glVertex3f(4.5, 0.01, 2.5); //top right
glVertex3f(4.5, 0.01, 2);//top left
glEnd();
glEnable(GL_TEXTURE_2D);
glBegin(GL_QUADS); //TOP
glBindTexture(GL_TEXTURE_2D, textures[0]);
glNormal3f(0,1,0);
glColor4f(1,1,1,0);
//glColor3d(0.5,0.40,0.05);
glTexCoord2f(0.0f,0.0f);
glVertex3f(-4.5, 0.3, 2);//bottom left
glTexCoord2f(1.0f,0.0f);
glVertex3f(-4.5, 0.3, 2.5);//bottom right
glTexCoord2f(1.0f,1.0f);
glVertex3f(4.5, 0.3, 2.5);//top right
glTexCoord2f(0.0f,1.0f);
glVertex3f(4.5, 0.3, 2);//top left
glBindTexture(GL_TEXTURE_2D, 0); // Set the GL texture to NULL, standard cleanup
glEnd();
glDisable(GL_TEXTURE_2D);
glEnable(GL_TEXTURE_2D);
glBegin(GL_QUADS); //RIGHT
glNormal3f(0,0,1);
glColor4f(1,1,1,0);
glTexCoord2f(0.0f,0.0f);
glVertex3f(-4.5, 0, 2.5);//bottom left
glTexCoord2f(1.0f,0.0f);
glVertex3f(4.5, 0, 2.5);//bottom right
glTexCoord2f(1.0f,1.0f);
glVertex3f(4.5, 0.3, 2.5); //top right
glTexCoord2f(0.0f,1.0f);
glVertex3f(-4.5, 0.3, 2.5);//top left
glBindTexture(GL_TEXTURE_2D, 0); // Set the GL texture to NULL, standard cleanup
glEnd();
glDisable(GL_TEXTURE_2D);
glEnable(GL_TEXTURE_2D);
glBegin(GL_QUADS); //LEFT
glNormal3f(0,0,-1);
glColor4f(1,1,1,0);
glTexCoord2f(0.0f,0.0f);
glVertex3f(-4.5, 0, 2);//bottom left
glTexCoord2f(1.0f,0.0f);
glVertex3f(4.5, 0, 2);//bottom right
glTexCoord2f(1.0f,1.0f);
glVertex3f(4.5, 0.3, 2); //top right
glTexCoord2f(0.0f,1.0f);
glVertex3f(-4.5, 0.3, 2);//top left
glEnd();
glDisable(GL_TEXTURE_2D);
//Left Cushion
glBegin(GL_QUADS); //BOTTOM
glNormal3f(0,-1,0);
glColor3d(0.5,0.40,0.05);
glVertex3f(-4.5, 0.01, -2.5);//bottom left
glVertex3f(-4.5, 0.01, -2);//bottom right
glVertex3f(4.5, 0.01, -2); //top right
glVertex3f(4.5, 0.01, -2.5);//top left
glEnd();
//glEnable(GL_TEXTURE_2D);
glBegin(GL_QUADS); //TOP
glNormal3f(0,1,0);
glColor4f(1,1,1,0);
glTexCoord2f(0.0f,0.0f);
glVertex3f(-4.5, 0.3, -2.5);//bottom left
glTexCoord2f(1.0f,0.0f);
glVertex3f(-4.5, 0.3, -2);//bottom right
glTexCoord2f(1.0f,1.0f);
glVertex3f(4.5, 0.3, -2); //top right
glTexCoord2f(0.0f,1.0f);
glVertex3f(4.5, 0.3, -2.5);//top left
glEnd();
//glDisable(GL_TEXTURE_2D);
//glEnable(GL_TEXTURE_2D);
glBegin(GL_QUADS); //RIGHT
glNormal3f(0,0,1);
glColor4f(1,1,1,0);
glTexCoord2f(0.0f,0.0f);
glVertex3f(-4.5, 0, -2);//bottom left
glTexCoord2f(1.0f,0.0f);
glVertex3f(4.5, 0, -2);//bottom right
glTexCoord2f(1.0f,1.0f);
glVertex3f(4.5, 0.3, -2); //top right
glTexCoord2f(0.0f,1.0f);
glVertex3f(-4.5, 0.3, -2);//top left
glEnd();
//glDisable(GL_TEXTURE_2D);
//glEnable(GL_TEXTURE_2D);
glBegin(GL_QUADS); //LEFT
glNormal3f(0,0,-1);
glColor4f(1,1,1,0);
glTexCoord2f(0.0f,0.0f);
glVertex3f(-4.5, 0, -2.5);//bottom left
glTexCoord2f(1.0f,0.0f);
glVertex3f(4.5, 0, -2.5);//bottom right
glTexCoord2f(1.0f,1.0f);
glVertex3f(4.5, 0.3, -2.5); //top right
glTexCoord2f(0.0f,1.0f);
glVertex3f(-4.5, 0.3, -2.5);//top left
glEnd();
//glDisable(GL_TEXTURE_2D);
//Bottom Cushion
glBegin(GL_QUADS); //BOTTOM
glNormal3f(0,-1,0);
glColor3d(0.5,0.40,0.05);
glVertex3f(-5, 0.01, -2);//bottom left
glVertex3f(-5, 0.01, 2);//bottom right
glVertex3f(-4.5, 0.01, 2); //top right
glVertex3f(-4.5, 0.01, -2);//top left
glEnd();
//glEnable(GL_TEXTURE_2D);
glBegin(GL_QUADS); //TOP
glNormal3f(0,1,0);
glColor4f(1,1,1,0);
glTexCoord2f(0.0f,0.0f);
glVertex3f(-5, 0.3, -2);//bottom left
glTexCoord2f(1.0f,0.0f);
glVertex3f(-5, 0.3, 2);//bottom right
glTexCoord2f(1.0f,1.0f);
glVertex3f(-4.5, 0.3, 2); //top right
glTexCoord2f(0.0f,1.0f);
glVertex3f(-4.5, 0.3, -2);//top left
glEnd();
//glDisable(GL_TEXTURE_2D);
//glEnable(GL_TEXTURE_2D);
glBegin(GL_QUADS); //RIGHT
glNormal3f(0,0,1);
glColor4f(1,1,1,0);
glTexCoord2f(0.0f,0.0f);
glVertex3f(-5, 0, -2);//bottom left
glTexCoord2f(1.0f,0.0f);
glVertex3f(-5, 0, 2);//bottom right
glTexCoord2f(1.0f,1.0f);
glVertex3f(-5, 0.3, 2); //top right
glTexCoord2f(0.0f,1.0f);
glVertex3f(-5, 0.3, -2);//top left
glEnd();
//glDisable(GL_TEXTURE_2D);
//glEnable(GL_TEXTURE_2D);
glBegin(GL_QUADS); //LEFT
glNormal3f(0,0,-1);
glColor4f(1,1,1,0);
glTexCoord2f(0.0f,0.0f);
glVertex3f(-5, 0.0,-2);//bottom left
glTexCoord2f(1.0f,0.0f);
glVertex3f(-5, 0.0, 2);//bottom right
glTexCoord2f(1.0f,1.0f);
glVertex3f(-5, 0.3, 2); //top right
glTexCoord2f(0.0f,1.0f);
glVertex3f(-5, 0.3,-2);//top left
glEnd();
//glDisable(GL_TEXTURE_2D);
//top cushion
glBegin(GL_QUADS); //BOTTOM
glNormal3f(0,-1,0);
glColor3d(0.5,0.40,0.05);
glVertex3f(4.5, 0.01, -2);//bottom left
glVertex3f(4.5, 0.01, 2);//bottom right
glVertex3f(5, 0.01, 2); //top right
glVertex3f(5, 0.01, -2);//top left
glEnd();
//glEnable(GL_TEXTURE_2D);
glBegin(GL_QUADS); //TOP
glNormal3f(0,1,0);
glColor4f(1,1,1,0);
glTexCoord2f(0.0f,0.0f);
glVertex3f(4.5,0.3,-2);//bottom left
glTexCoord2f(1.0f,0.0f);
glVertex3f(4.5,0.3, 2);//bottom right
glTexCoord2f(1.0f,1.0f);
glVertex3f(5, 0.3, 2); //top right
glTexCoord2f(0.0f,1.0f);
glVertex3f(5, 0.3, -2);//top left
glEnd();
//glDisable(GL_TEXTURE_2D);
//glEnable(GL_TEXTURE_2D);
glBegin(GL_QUADS); //RIGHT
glNormal3f(0,0,1);
glColor4f(1,1,1,0);
glTexCoord2f(0.0f,0.0f);
glVertex3f(5, 0, -2);//bottom left
glTexCoord2f(1.0f,0.0f);
glVertex3f(5, 0, 2);//bottom right
glTexCoord2f(1.0f,1.0f);
glVertex3f(5, 0.3, 2); //top right
glTexCoord2f(0.0f,1.0f);
glVertex3f(5, 0.3, -2);//top left
glEnd();
//glDisable(GL_TEXTURE_2D);
//glEnable(GL_TEXTURE_2D);
glBegin(GL_QUADS); //LEFT
glNormal3f(0,0,-1);
glColor4f(1,1,1,0);
glTexCoord2f(0.0f,0.0f);
glVertex3f(4.5, 0, -2);//bottom left
glTexCoord2f(1.0f,0.0f);
glVertex3f(4.5, 0, 2);//bottom right
glTexCoord2f(1.0f,1.0f);
glVertex3f(4.5, 0.3, 2); //top right
glTexCoord2f(0.0f,1.0f);
glVertex3f(4.5, 0.3, -2);//top left
glEnd();
//glDisable(GL_TEXTURE_2D);
}
void Display::DisplayScene()
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // Clear the back buffer
glPushMatrix();
glLoadIdentity();
glNormal3f(0,1,0);
Vector3f Pos = Redball.GetPos();
gluLookAt(eyeX, eyeY, eyeZ, // eye position
0, 0, 0, // what I'm looking at
0.0, 1.0, 0); // Up direction
float Position[] = {lightX, lightY, lightZ, 1.0f};
glLightfv(GL_LIGHT0, GL_POSITION, Position);
DrawLight(0, Position);
/* Rendering code goes here */
glPushMatrix();
Ball Redball[8];
for (int i = BALL_RED_START; i<BALL_RED_END;i++)
{
float x = 0;
glTranslatef(x+1,1,0);
glColor3f(1,0,0);
Redball[i].DrawRed();
}
glPopMatrix();
glPushMatrix();
Ball Yellowball[8];
for (int i = BALL_YELLOW_START; i<BALL_YELLOW_END;i++)
{
float x = 0;
glTranslatef(x+1,0,1);
glColor3f(2,1,0);
Yellowball[i].DrawYellow();
}
glPopMatrix();
drawTable();
drawCushions();
Table(-2,-4.5,2,4.5); // Draws the table top in trianglestrip -4.5, 0.5, -0.5, 9.5
glPopMatrix();
glutSwapBuffers(); // Swap the front and back buffers
}
void Display::Resize(int w, int h)
{
/* Resize is called when window is resized */
glMatrixMode(GL_PROJECTION); // set matrix mode to profection
// this dictates how the 3d scene is "squashed" onto the 2d screen
glLoadIdentity();
glViewport(0, 0, w, h); // Set the part of the window to use.
gluPerspective(45, // field of view
(float)w/(float)h, // ration of window
1, // front clipping plane
1000 // back clipping plane
); // set the area in the 3d scene to draw
glMatrixMode(GL_MODELVIEW); // Setthe matrix mode to model view
// the matrix specifies how the 3d scene is viewed
/*glLoadIdentity();
gluLookAt(-3.5, 2, eyeZ, // eye position
1, 1, 0, // what I'm looking at
0.0, 1.0, 0); // Up direction*/
}
void Display::Idle()
{
/* When nothing else is happening, idle is called.
* Simulation should be done here and then
* the display method should be called
*/
BallMovement();
glutPostRedisplay();
}
位圖
我也有一個關於我的紋理的課程
#ifndef _BITMAP_H
#define _BITMAP_H
#include <iostream>
#include <cstdio>
#include <string>
using namespace std;
const short BITMAP_MAGIC_NUMBER=19778;
const int RGB_BYTE_SIZE=3;
#pragma pack(push,bitmap_data,1)
typedef struct tagRGBQuad {
char rgbBlue;
char rgbGreen;
char rgbRed;
char rgbReserved;
} RGBQuad;
typedef struct tagBitmapFileHeader {
unsigned short bfType;
unsigned int bfSize;
unsigned short bfReserved1;
unsigned short bfReserved2;
unsigned int bfOffBits;
} BitmapFileHeader;
typedef struct tagBitmapInfoHeader {
unsigned int biSize;
int biWidth;
int biHeight;
unsigned short biPlanes;
unsigned short biBitCount;
unsigned int biCompression;
unsigned int biSizeImage;
int biXPelsPerMeter;
int biYPelsPerMeter;
unsigned int biClrUsed;
unsigned int biClrImportant;
} BitmapInfoHeader;
#pragma pack(pop,bitmap_data)
class Bitmap {
public:
//variables
RGBQuad *colours;
char *data;
bool loaded;
int width,height;
unsigned short bpp;
string error;
//methods
Bitmap(void);
Bitmap(char *);
~Bitmap();
bool loadBMP(char *);
private:
//variables
BitmapFileHeader bmfh;
BitmapInfoHeader bmih;
int byteWidth; //the width in bytes of the image
int padWidth; //the width in bytes of the added image
unsigned int dataSize; //size of the data in the file
//methods
void reset(void);
bool convert24(char *); //convert to 24bit RGB bottom up data
bool convert8(char *); //convert to 24bit RGB bottom up data
};
#endif //_BITMAP_H
位圖文件
#include "Bitmap.h"
//basic constructor
Bitmap::Bitmap(){
reset();
}
//constructor loads the bitmap when it is created
Bitmap::Bitmap(char *file){
reset();
loadBMP(file);
}
//destructor
Bitmap::~Bitmap(){
if(colours!=0) {
delete[] colours;
}
if(data!=0) {
delete[] data;
}
}
//load a bitmap from a file and represent it correctly
//in memory
bool Bitmap::loadBMP(char *file) {
FILE *in; //file stream for reading
char *tempData; //temp storage for image data
int numColours; //total available colours
//bitmap is not loaded yet
loaded=false;
//make sure memory is not lost
if(colours!=0) {
delete[] colours;
}
if(data!=0) {
delete[] data;
}
//open the file for reading in binary mode
in=fopen(file,"rb");
//if the file does not exist return in error
if(in==NULL) {
error="File not found";
fclose(in);
return false;
}
//read in the entire BITMAPFILEHEADER
fread(&bmfh,sizeof(BitmapFileHeader),1,in);
//check for the magic number that says this is a bitmap
if(bmfh.bfType!=BITMAP_MAGIC_NUMBER) {
error="File is not in DIB format";
fclose(in);
return false;
}
//read in the entire BITMAPINFOHEADER
fread(&bmih,sizeof(BitmapInfoHeader),1,in);
//save the width, height and bits per pixel for external use
width=bmih.biWidth;
height=bmih.biHeight;
bpp=bmih.biBitCount;
//calculate the size of the image data with padding
dataSize=(width*height*(unsigned int)(bmih.biBitCount/8.0));
//calculate the number of available colours
numColours=1<<bmih.biBitCount;
//if the bitmap is not 8 bits per pixel or more
//return in error
if(bpp<8) {
error="File is not 8 or 24 bits per pixel";
fclose(in);
return false;
}
//load the palette for 8 bits per pixel
if(bpp==8) {
colours=new RGBQuad[numColours];
fread(colours,sizeof(RGBQuad),numColours,in);
}
//set up the temporary buffer for the image data
tempData=new char[dataSize];
//exit if there is not enough memory
if(tempData==NULL) {
error="Not enough memory to allocate a temporary buffer";
fclose(in);
return false;
}
//read in the entire image
fread(tempData,sizeof(char),dataSize,in);
//close the file now that we have all the info
fclose(in);
//calculate the witdh of the final image in bytes
byteWidth=padWidth=(int)((float)width*(float)bpp/8.0);
//adjust the width for padding as necessary
while(padWidth%4!=0) {
padWidth++;
}
//change format from GBR to RGB
if(bpp==8) {
loaded=convert8(tempData);
}
else if(bpp==24) {
loaded=convert24(tempData);
}
//clean up memory
delete[] tempData;
//bitmap is now loaded
error="Bitmap loaded";
//return success
return loaded;
}
//function to set the inital values
void Bitmap::reset(void) {
loaded=false;
colours=0;
data=0;
error="";
}
bool Bitmap::convert24(char* tempData) {
int offset,diff;
diff=width*height*RGB_BYTE_SIZE;
//allocate the buffer for the final image data
data=new char[diff];
//exit if there is not enough memory
if(data==NULL) {
error="Not enough memory to allocate an image buffer";
delete[] data;
return false;
}
if(height>0) {
offset=padWidth-byteWidth;
//count backwards so you start at the front of the image
for(int i=0;i<dataSize;i+=3) {
//jump over the padding at the start of a new line
if((i+1)%padWidth==0) {
i+=offset;
}
//transfer the data
*(data+i+2)=*(tempData+i);
*(data+i+1)=*(tempData+i+1);
*(data+i)=*(tempData+i+2);
}
}
//image parser for a forward image
else {
offset=padWidth-byteWidth;
int j=dataSize-3;
//count backwards so you start at the front of the image
//here you can start from the back of the file or the front,
//after the header The only problem is that some programs
//will pad not only the data, but also the file size to
//be divisible by 4 bytes.
for(int i=0;i<dataSize;i+=3) {
//jump over the padding at the start of a new line
if((i+1)%padWidth==0) {
i+=offset;
}
//transfer the data
*(data+j+2)=*(tempData+i);
*(data+j+1)=*(tempData+i+1);
*(data+j)=*(tempData+i+2);
j-=3;
}
}
return true;
}
bool Bitmap::convert8(char* tempData) {
int offset,diff;
diff=width*height*RGB_BYTE_SIZE;
//allocate the buffer for the final image data
data=new char[diff];
//exit if there is not enough memory
if(data==NULL) {
error="Not enough memory to allocate an image buffer";
delete[] data;
return false;
}
if(height>0) {
offset=padWidth-byteWidth;
int j=0;
//count backwards so you start at the front of the image
for(int i=0;i<dataSize*RGB_BYTE_SIZE;i+=3) {
//jump over the padding at the start of a new line
if((i+1)%padWidth==0) {
i+=offset;
}
//transfer the data
*(data+i)=colours[*(tempData+j)].rgbRed;
*(data+i+1)=colours[*(tempData+j)].rgbGreen;
*(data+i+2)=colours[*(tempData+j)].rgbBlue;
j++;
}
}
//image parser for a forward image
else {
offset=padWidth-byteWidth;
int j=dataSize-1;
//count backwards so you start at the front of the image
for(int i=0;i<dataSize*RGB_BYTE_SIZE;i+=3) {
//jump over the padding at the start of a new line
if((i+1)%padWidth==0) {
i+=offset;
}
//transfer the data
*(data+i)=colours[*(tempData+j)].rgbRed;
*(data+i+1)=colours[*(tempData+j)].rgbGreen;
*(data+i+2)=colours[*(tempData+j)].rgbBlue;
j--;
}
}
return true;
}
我所有的錯誤與Display.cpp中的以下代碼有關：
Bitmap image[2];
image[0].loadBMP("myTexture.bmp");
image[1].loadBMP("myTexture2.bmp");
錯誤：
錯誤C2040：圖像：“位圖[2]”的間接尋址級別有所不同
錯誤C2088：“ [”上課不合法（兩次）
錯誤C2228：.BMP的左側必須具有class / struct / union（兩次）
沒有運算符“ []”與這些操作數匹配（兩次）
Bitmap image;
Bitmap image[2];
您兩次聲明image ，沒有任何意義。 如果要使image成為一個位圖，則刪除第一個。
如果使用數組，則需要將實際位圖稱為bitmap[0]和bitmap[1] 。 而且它不適合您的其余代碼-您兩次調用loadTexture ，因此在其中加載兩個位圖沒有任何意義。 因此，僅在其中保留一個位圖。
void loadTexture(GLuint texture, const char* filename)
{
Bitmap image;
image.loadBMP(filename);
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_NEAREST);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_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, image.width, image.height, GL_RGB, GL_UNSIGNED_BYTE, image.data);
}
將BMP加載到OpenGL紋理中會切換紅色和藍色。 （C ++ /視窗）
[英]Loading a BMP into an OpenGL textures switches the red and blue colors. (C++/Windows)
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