OpenGLとC++を使用してテクスチャを表示するのに問題があります。RGB Rawファイルからテクスチャをロードしてテクスチャにバインドしていますが、クワッドにテクスチャを表示しようとすると、テクスチャが白になります。glGetErrorを使用していますが、エラーは発生しません。これが私のコードです：
#include <iostream>
#include <windows.h> // Standard header for MS Windows applications
#include <GL/gl.h> // Open Graphics Library (OpenGL) header
#include <GL/glut.h> // The GL Utility Toolkit (GLUT) Header
using namespace std;
typedef struct {
int width;
int height;
char* title;
float field_of_view_angle;
float z_near;
float z_far;
} glutWindow;
glutWindow win;
float rotation, distance1;
bool light=TRUE;
bool trans=FALSE;
GLuint tex;
void drawFlatFace(float size)
{
glBegin(GL_QUADS);
glTexCoord2f (0, 0);
glVertex3f(-size, -2*size, size);
glTexCoord2f (1.0, 0);
glVertex3f(size, -2*size, size);
glTexCoord2f (1.0, 1.0);
glVertex3f(size, 2*size, size);
glTexCoord2f (0, 1.0);
glVertex3f(-size, 2*size, size);
glEnd();
}
void drawBlock(float size){
glColor3f(1.0f,1.0f,1.0f);
glPushMatrix();
drawFlatFace (size);
glRotatef (90, 0, 1, 0);
drawFlatFace (size);
glRotatef (90, 0, 1, 0);
drawFlatFace (size);
glRotatef (90, 0, 1, 0);
drawFlatFace (size);
glPopMatrix();
}
GLuint loadTexture(const char * filename) {
GLuint text[1];
GLubyte* bits = new GLubyte[512*256*3];
FILE *file;
fopen_s(&file,filename,"rb");
fread(&bits,(512*256*3),1,file);
fclose(file);
glGenTextures(1,&text[0]);
glBindTexture(GL_TEXTURE_2D,text[0]);
glTexEnvf(GL_TEXTURE_ENV,GL_TEXTURE_ENV_MODE,GL_MODULATE);
glTexImage2D(GL_TEXTURE_2D, 0, 3,256,512,0,GL_RGB,GL_UNSIGNED_BYTE,bits);
free(bits);
return text[0];
}
void display()
{
GLenum err;
err = glGetError();
if (err != GL_NO_ERROR)
{
cerr << "OpenGL error: " << gluErrorString(err) << endl;
}
tex=loadTexture("tex.raw");
glBindTexture(GL_TEXTURE_2D,tex);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // Clear Screen and Depth Buffer
glLoadIdentity();
gluLookAt( 10+distance1 ,1.4,0, 0,0,0, 0,1,0); // Define a viewing transformation
glRotatef(rotation, 0.f, 1.f, 0.f);
drawBlock(3);
if (light) glEnable(GL_LIGHTING); // Enable Lighting
else glDisable(GL_LIGHTING); // Disable Lighting
if (trans) glEnable (GL_BLEND); // Enable Transparency
else glDisable(GL_BLEND); // Disable Transparency
glutSwapBuffers();
}
void initialize ()
{
glMatrixMode(GL_PROJECTION); // select projection matrix
glViewport(0, 0, win.width, win.height); // set the viewport
glLoadIdentity(); // reset projection matrix
GLfloat aspect = (GLfloat) win.width / win.height;
gluPerspective(win.field_of_view_angle, aspect, win.z_near, win.z_far); // set up a perspective projection matrix
glMatrixMode(GL_MODELVIEW); // specify which matrix is the current matrix
glHint( GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST ); // specify implementation-specific hints
GLfloat amb_light[] = { 0.3, 0.3, 0.3, 1.0 };
GLfloat diffuse[] = { 0.4, 0.4, 0.4, 1.0 };
GLfloat specular[] = { 0.5, 0.5, 0.5, 1.0 };
glLightModelfv( GL_LIGHT_MODEL_AMBIENT, amb_light );
glLightfv( GL_LIGHT0, GL_SPECULAR, specular );
glLightfv( GL_LIGHT0, GL_DIFFUSE, diffuse );
GLfloat light_position[] = { 1.0, 1.0, 0, 0.0 };
glLightfv(GL_LIGHT0, GL_POSITION, light_position);
glEnable( GL_LIGHT0 );
glEnable( GL_COLOR_MATERIAL );
glEnable( GL_LIGHTING );
//glLightModeli( GL_LIGHT_MODEL_TWO_SIDE, GL_FALSE );
glEnable(GL_TEXTURE_2D); // Enable Texture Mapping
glShadeModel(GL_SMOOTH); // Enable Smooth Shading
glClearColor(0.0f, 0.0f, 0.0f, 0.5f); // Black Background
glClearDepth(1.0f); // Depth Buffer Setup
glEnable(GL_DEPTH_TEST); // Enables Depth Testing
glDepthFunc(GL_LEQUAL); // The Type Of Depth Testing To Do
glTexParameteri( GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER, GL_LINEAR);
}
void keyboard ( int key, int mousePositionX, int mousePositionY )
{
switch ( key )
{
case GLUT_KEY_DOWN:
if (distance1<9){
distance1=distance1+.3;
}
break;
case GLUT_KEY_UP:
if (distance1>-9){
distance1=distance1-.3;
}
break;
case GLUT_KEY_LEFT:
rotation=rotation-2;
break;
case GLUT_KEY_RIGHT:
rotation=rotation+2;
break;
case GLUT_KEY_PAGE_UP:
light=TRUE;
break;
case GLUT_KEY_PAGE_DOWN:
light=FALSE;
break;
case GLUT_KEY_HOME:
trans=TRUE;
break;
case GLUT_KEY_END:
trans=FALSE;
break;
default:
break;
}
}
int main(int argc, char **argv)
{
// set window values
win.width = 800;
win.height = 600;
win.title = "Test Texture";
win.field_of_view_angle = 45;
win.z_near = 1.0f;
win.z_far = 500.0f;
// initialize and run program
glutInit(&argc, argv); // GLUT initialization
glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH ); // Display Mode
glutInitWindowSize(win.width,win.height); // set window size
glutCreateWindow(win.title); // create Window
// Callback functions
glutDisplayFunc(display); // register Display Function
glutIdleFunc( display ); // register Idle Function
glutSpecialFunc( keyboard ); // register Keyboard Handler
initialize();
glutMainLoop(); // run GLUT mainloop
return 0;
}
IrfanViewに256x512、24BPP、RGB（サイズは393,216バイトまたは3 * 512 * 256）としてロードされたときにRawファイルが正しく表示されることを追加したい