Buatlah program yang
menampilkan sebuah kubus dengan texture tiap sisinya menampilkan texture nama tiap anggota. Image texture mengandung semua tampilan nama anggota kelompok.
Tampilkan source code, texture, dan tampilkan kubus yang nampak semua sisinya.
Syntax imageloader.h:
#ifndef IMAGE_LOADER_H_INCLUDED
#define IMAGE_LOADER_H_INCLUDED
//Represents an image
class Image {
public:
Image(char*
ps, int w, int
h);
~Image();
/* An array of the form
(R1, G1, B1, R2, G2, B2, ...) indicating the
* color of each pixel in
image. Color components range from 0 to 255.
* The array starts the
bottom-left pixel, then moves right to the end
* of the row, then moves
up to the next column, and so on. This is the
* format in which OpenGL
likes images.
*/
char* pixels;
int width;
int height;
};
//Reads a bitmap image
from file.
Image* loadBMP(const char*
filename);
#endif
Syntax
imageloader.cpp:
#include <assert.h>
#include <fstream>
#include <stdlib.h>
#include <glut.h>
#include "imageloader.h"
int w = 480, h = 480;
int s, p=-10, a, b, c;
GLuint _textureId;
GLint loadTexture(Image* image)
{
GLuint textureId;
glGenTextures(1, &textureId);
glBindTexture(GL_TEXTURE_2D,
textureId);
glTexImage2D(GL_TEXTURE_2D,
0,
GL_RGB,
image->width, image->height,
0,
GL_RGB,
GL_UNSIGNED_BYTE,
image->pixels);
return textureId;
}
using namespace std;
Image::Image(char*
ps, int w, int
h) : pixels(ps), width(w), height(h) {}
Image::~Image() {
delete[] pixels;
}
namespace {
int toInt(const char* bytes) {
return (int)(((unsigned char)bytes[3]
<< 24) |
((unsigned
char)bytes[2] << 16) |
((unsigned
char)bytes[1] << 8) |
(unsigned
char)bytes[0]);
}
short toShort(const char* bytes) {
return (short)(((unsigned char)bytes[1]
<< 8) |
(unsigned
char)bytes[0]);
}
int readInt(ifstream &input) {
char buffer[4];
input.read(buffer, 4);
return toInt(buffer);
}
short readShort(ifstream &input) {
char buffer[2];
input.read(buffer, 2);
return toShort(buffer);
}
template<class T>
class auto_array {
private:
T* array;
mutable bool isReleased;
public:
explicit auto_array(T* array_ = NULL) :
array(array_), isReleased(false) {
}
auto_array(const
auto_array<T> &aarray) {
array = aarray.array;
isReleased = aarray.isReleased;
aarray.isReleased = true;
}
~auto_array() {
if (!isReleased && array
!= NULL) {
delete[] array;
}
}
T* get() const
{
return array;
}
T &operator*()
const {
return *array;
}
void operator=(const auto_array<T> &aarray) {
if (!isReleased && array
!= NULL) {
delete[] array;
}
array = aarray.array;
isReleased = aarray.isReleased;
aarray.isReleased = true;
}
T* operator->()
const {
return array;
}
T* release() {
isReleased = true;
return array;
}
void reset(T* array_ = NULL) {
if (!isReleased && array
!= NULL) {
delete[] array;
}
array = array_;
}
T* operator+(int i) {
return array + i;
}
T &operator[](int i) {
return array[i];
}
};
}
Image* loadBMP(const char* filename)
{
ifstream input;
input.open(filename,
ifstream::binary);
assert(!input.fail() || !"Could not find file");
char buffer[2];
input.read(buffer, 2);
assert(buffer[0] == 'B' && buffer[1] == 'M' || !"Not a
bitmap file");
input.ignore(8);
int dataOffset = readInt(input);
//Read the header
int headerSize = readInt(input);
int width;
int height;
switch(headerSize) {
case 40:
//V3
width = readInt(input);
height = readInt(input);
input.ignore(2);
assert(readShort(input) == 24 || !"Image is not 24 bits per pixel");
assert(readShort(input) == 0 || !"Image is compressed");
break;
case 12:
//OS/2 V1
width = readInt(input);
height = readInt(input);
input.ignore(2);
assert(readShort(input) == 24 || !"Image is not 24 bits per pixel");
break;
case 64:
//OS/2 V2
assert(!"Can't
load OS/2 V2 bitmaps");
break;
case 108:
//Windows V4
assert(!"Can't
load Windows V4 bitmaps");
break;
case 124:
//Windows V5
assert(!"Can't
load Windows V5 bitmaps");
break;
default:
assert(!"Unknown
bitmap format");
}
//Read the data
int bytesPerRow = ((width * 3 + 3) / 4) * 4 - (width * 3 % 4);
int size = bytesPerRow * height;
auto_array<char> pixels(new char[size]);
input.seekg(dataOffset,
ios_base::beg);
input.read(pixels.get(), size);
//Get the data into the
right format
auto_array<char> pixels2(new char[width * height * 3]);
for(int y = 0; y < height;
y++) {
for(int x = 0; x < width;
x++) {
for(int c = 0; c < 3; c++) {
pixels2[3 * (width * y + x) + c] =
pixels[bytesPerRow * y + 3 * x + (2 -
c)];
}
}
}
input.close();
return new Image(pixels2.release(),
width, height);
}
void mydisplay(void)
{
glClearColor(1,1,1,1);
glClear(GL_COLOR_BUFFER_BIT |
GL_DEPTH_BUFFER_BIT);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glEnable(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D,
_textureId);
glTexParameteri(GL_TEXTURE_2D,
GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTranslatef(0,0,p);
glRotatef(s,
a, b, c);
glPushMatrix();
glRotatef(180,0,1,0);
glBegin(GL_QUADS);
glTexCoord2f(0.0f,
0.0f);
glVertex2f(-2.0f,
-2.0f);
glTexCoord2f(0.0f,
0.5f);
glVertex2f(2.0f,
-2.0f);
glTexCoord2f(1.0f,
0.5f);
glVertex2f(2.0f,
2.0f);
glTexCoord2f(1.0f,
0.0f);
glVertex2f(-2.0f,
2.0f);
glEnd();
glPopMatrix();
glPushMatrix();
glTranslatef(2,0,2);
glRotatef(90,0,1,0);
glBegin(GL_QUADS);
glTexCoord2f(0.0f,
0.5f);
glVertex2f(-2.0f,
-2.0f);
glTexCoord2f(0.0f,
1.0f);
glVertex2f(2.0f,
-2.0f);
glTexCoord2f(1.0f,
1.0f);
glVertex2f(2.0f,
2.0f);
glTexCoord2f(1.0f,
0.5f);
glVertex2f(-2.0f,
2.0f);
glEnd();
glTranslatef(-2,0,-2);
glRotatef(-90,0,1,0);
glBegin(GL_QUADS);
glTexCoord2f(0.0f,
0.0f);
glVertex2f(-2.0f,
-2.0f);
glTexCoord2f(0.0f,
0.5f);
glVertex2f(2.0f,
-2.0f);
glTexCoord2f(1.0f,
0.5f);
glVertex2f(2.0f,
2.0f);
glTexCoord2f(1.0f,
0.0f);
glVertex2f(-2.0f,
2.0f);
glEnd();
glTranslatef(-2,0,-2);
glRotatef(-90,0,1,0);
glBegin(GL_QUADS);
glTexCoord2f(0.0f,
0.5f);
glVertex2f(-2.0f,
-2.0f);
glTexCoord2f(0.0f,
1.0f);
glVertex2f(2.0f,
-2.0f);
glTexCoord2f(1.0f,
1.0f);
glVertex2f(2.0f,
2.0f);
glTexCoord2f(1.0f,
0.5f);
glVertex2f(-2.0f,
2.0f);
glEnd();
glPopMatrix();
glPushMatrix();
glTranslatef(0,2,2);
glRotatef(-90,1,0,0);
glBegin(GL_QUADS);
glTexCoord2f(0.0f,
0.0f);
glVertex2f(-2.0f,
-2.0f);
glTexCoord2f(0.0f,
0.5f);
glVertex2f(2.0f,
-2.0f);
glTexCoord2f(1.0f,
0.5f);
glVertex2f(2.0f,
2.0f);
glTexCoord2f(1.0f,
0.0f);
glVertex2f(-2.0f,
2.0f);
glEnd();
glPopMatrix();
glPushMatrix();
glTranslatef(0,-2,2);
glRotatef(90,1,0,0);
glBegin(GL_QUADS);
glTexCoord2f(0.0f,
0.5f);
glVertex2f(-2.0f,
-2.0f);
glTexCoord2f(0.0f,
1.0f);
glVertex2f(2.0f,
-2.0f);
glTexCoord2f(1.0f,
1.0f);
glVertex2f(2.0f,
2.0f);
glTexCoord2f(1.0f,
0.5f);
glVertex2f(-2.0f,
2.0f);
glEnd();
glPopMatrix();
glDisable(GL_TEXTURE);
glutSwapBuffers();
}
void resize(int w1, int h1)
{
glViewport(0,0,w1,h1);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(45.0, (float)w1/(float)h1,
1.0, 300.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
}
void init()
{
GLfloat
LightPosition[] = {-10.0f, 20.0f, 20.0f, 0.0f};
glShadeModel(GL_SMOOTH);
glClearColor(0.0f,
0.0f, 0.0f, 0.5f);
glClearDepth(1.0f);
glEnable(GL_DEPTH_TEST);
glHint(GL_PERSPECTIVE_CORRECTION_HINT,
GL_NICEST);
glLightfv(GL_LIGHT0,
GL_POSITION, LightPosition);
glEnable(GL_LIGHTING);
glEnable(GL_LIGHT0);
glEnable(GL_COLOR_MATERIAL);
glBlendFunc(GL_SRC_ALPHA,
GL_ONE);
glColorMaterial(GL_FRONT,
GL_DIFFUSE);
Image*
image = loadBMP("belafri-fix.bmp");
_textureId
= loadTexture(image);
return;
}
void myKeyboard(unsigned char key, int x, int y){
if(key=='x')
{
a=1;
}
else if(key=='c')
{
b=1;
}
else if(key=='z')
{
c=1;
}
s+=20;
}
void timer(int value)
{
glutPostRedisplay();
glutTimerFunc(50,timer,0);
}
void main(int argc, char **argv)
{
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_DEPTH |
GLUT_DOUBLE | GLUT_RGBA);
glutInitWindowPosition(100,100);
glutInitWindowSize(w,h);
glutCreateWindow("grafkom praktikum 10 kelompok 9");
glClearColor(0,0,0,0);
glutDisplayFunc(mydisplay);
glutTimerFunc(50, timer, 0);
glutKeyboardFunc(myKeyboard);
glutReshapeFunc(resize);
glutMainLoop();
}
Output:
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