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hi im trying to texture the floor of my level but when i call it the program compiles ok but the texture doesnt appear any help would be great

#include windows.h #include gl\gl.h #include gl\glut.h #include stdlib.h #include iostream> #define ROAD 0 struct Image { unsigned long size_x; unsigned long size_y; char *data; }; typedef struct Image Image; const int textureCount = 1; Image myTextureData[textureCount]; GLuint theTexture[textureCount]; char* textureFilenames[textureCount] = {"road.bmp"}; void init(void); void display(void); void keyboard(unsigned char, int, int); void resize(int, int); void drawcube(float, float, float, float, float, float, int); int is_depth; int main (int argc, char **argv) { glutInit(&argc, argv); glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB); glutInitWindowSize(600, 600); glutInitWindowPosition(40, 40); glutCreateWindow("3D World"); init(); glutDisplayFunc(display); glutKeyboardFunc(keyboard); glutReshapeFunc(resize); glutMainLoop(); return 0; } void init(void) { glClearColor(0.0, 0.0, 0.0, 0.0); glEnable(GL_DEPTH_TEST); glMatrixMode(GL_MODELVIEW); is_depth = 1; } void display(void) { if (is_depth) glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); else glClear(GL_COLOR_BUFFER_BIT); glBegin(GL_QUADS); glTexCoord2f(0.0,0.0); glVertex3f(-75.0, 0.0, -400.0); glTexCoord2f(0.0,1.0); glVertex3f(-75.0, 0.0, 100.0); glTexCoord2f(1.0,1.0); glVertex3f(75.0, 0.0, 100.0); glTexCoord2f(1.0,1.0); glVertex3f(75.0, 0.0, -400.0); drawcube(-70,15,72,8,15,28,0); drawcube(-70,10,10,8,10,28,0); drawcube(-70,15,-45,8,15,18,0); drawcube(-70,15,-85,8,15,18,0); drawcube(-70,35,-125,8,35,12,0); drawcube(-70,9,-170,8,9,28,0); drawcube(-70,15,-220,8,15,18,0); drawcube(-70,15,-265,8,15,28,0); drawcube(-70,15,-330,8,15,28,0); drawcube(67,15,72,8,15,28,0); drawcube(67,10,10,8,10,28,0); drawcube(67,15,-45,8,15,18,0); drawcube(67,15,-85,8,15,18,0); drawcube(67,35,-125,8,35,12,0); drawcube(67,9,-170,8,9,28,0); drawcube(67,15,-220,8,15,18,0); drawcube(67,15,-265,8,15,28,0); drawcube(67,15,-330,8,15,28,0); drawcube(-33,18,-364,25,18,10,0); drawcube(25,28,-364,30,28,10,0); drawcube(25,28,90,30,28,10,0); drawcube(-33,18,90,25,18,10,0); drawcube(0,60,-125,18,60,22,0); drawcube(0,25,-225,8,25,28,0); drawcube(0,25,0,8,25,28,0); drawcube(-58,1,-135,4,0.5,215,0); drawcube(58,1,-135,4,0.5,215,0); drawcube(0,1,-345,60,0.5,4,0); drawcube(0,1,75,60,0.5,4,0); glEnd(); glutSwapBuffers(); } void keyboard(unsigned char key, int x, int y) { switch (key) { case 'a': glTranslatef(5.0, 0.0, 0.0); break; case 'd': glTranslatef(-5.0, 0.0, 0.0); break; case 'w': glTranslatef(0.0, 0.0, 5.0); break; case 's': glTranslatef(0.0, 0.0, -5.0); break; } display(); } void resize(int width, int height) { if (height == 0) height = 1; glMatrixMode(GL_PROJECTION); glLoadIdentity(); gluPerspective(45.0, width / height, 1.0, 400.0); glTranslatef(0.0, -5.0, -150.0); glMatrixMode(GL_MODELVIEW); } void drawcube(float xc, float yc, float zc, float x_offset, float y_offset, float z_offset, int color) { switch(color) { case 1: glColor3f(1.0,0.0,0.0); break; case 2: glColor3f(0.0,1.0,0.0); break; case 3: glColor3f(0.0,0.0,1.0); break; } glBegin(GL_QUADS); glVertex3f(xc - x_offset,yc - y_offset,zc - z_offset); glVertex3f(xc + x_offset,yc - y_offset,zc - z_offset); glVertex3f(xc + x_offset,yc + y_offset,zc - z_offset); glVertex3f(xc - x_offset,yc + y_offset,zc - z_offset); glVertex3f(xc + x_offset,yc + y_offset,zc - z_offset); glVertex3f(xc + x_offset,yc + y_offset,zc + z_offset); glVertex3f(xc + x_offset,yc - y_offset,zc + z_offset); glVertex3f(xc + x_offset,yc - y_offset,zc - z_offset); glVertex3f(xc - x_offset,yc - y_offset,zc + z_offset); glVertex3f(xc - x_offset,yc - y_offset,zc - z_offset); glVertex3f(xc - x_offset,yc + y_offset,zc - z_offset); glVertex3f(xc - x_offset,yc + y_offset,zc + z_offset); glVertex3f(xc + x_offset,yc + y_offset,zc - z_offset); glVertex3f(xc - x_offset,yc + y_offset,zc - z_offset); glVertex3f(xc - x_offset,yc + y_offset,zc + z_offset); glVertex3f(xc + x_offset,yc + y_offset,zc + z_offset); glVertex3f(xc - x_offset,yc - y_offset,zc + z_offset); glVertex3f(xc + x_offset,yc - y_offset,zc + z_offset); glVertex3f(xc + x_offset,yc - y_offset,zc - z_offset); glVertex3f(xc - x_offset,yc - y_offset,zc - z_offset); glVertex3f(xc + x_offset,yc + y_offset,zc + z_offset); glVertex3f(xc - x_offset,yc + y_offset,zc + z_offset); glVertex3f(xc - x_offset,yc - y_offset,zc + z_offset); glVertex3f(xc + x_offset,yc - y_offset,zc + z_offset); glEnd(); } int imageLoader(const char *filename, Image *image) { FILE *file; unsigned long size; unsigned long i; unsigned short int planes; unsigned short int bpp; char temp; char finalName[80]; glTexCoord2f(1.0, 0.0); strcpy(finalName, "" ); strcat(finalName, filename); if ((file = fopen(finalName, "rb"))==NULL) { printf("File Not Found : %s\n",finalName); return 0; } fseek(file, 18, SEEK_CUR); glTexCoord2f(1.0, 0.0); if ((i = fread(&image->size_x, 4, 1, file)) != 1) { printf("Error reading width from %s.\n", finalName); return 0; } if ((i = fread(&image->size_y, 4, 1, file)) != 1) { printf("Error reading height from %s.\n", finalName); return 0; } size = image->size_x * image->size_y * 3; if ((fread(&planes, 2, 1, file)) != 1) { printf("Error reading planes from %s.\n", finalName); return 0; } if (planes != 1) { printf("Planes from %s is not 1: %u\n", finalName, planes); return 0; } if ((i = fread(&bpp, 2, 1, file)) != 1) { printf("Error reading bpp from %s.\n", finalName); return 0; } if (bpp != 24) { printf("Bpp from %s is not 24: %u\n", finalName, bpp); return 0; } fseek(file, 24, SEEK_CUR); 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", finalName); return 0; } for (i=0;i<size;i+=3) { temp = image->data[i]; image->data[i] = image->data[i+2]; image->data[i+2] = temp; } return 1; } void textureLoader() { glPixelStorei(GL_UNPACK_ALIGNMENT, 1); for(int k=0; k < textureCount; k++) { if(!imageLoader(textureFilenames[k], &myTextureData[k])) exit(1); glGenTextures(1, &theTexture[k]); glBindTexture(GL_TEXTURE_2D, theTexture[k]); glTexParameterf(GL_TEXTURE_2D,GL_TEXTURE_WRAP_S,GL_REPEAT); glTexParameterf(GL_TEXTURE_2D,GL_TEXTURE_WRAP_T,GL_REPEAT); glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR); glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR_MIPMAP_NEAREST); gluBuild2DMipmaps(GL_TEXTURE_2D, 3, myTextureData[k].size_x, myTextureData[k].size_y, GL_RGB, GL_UNSIGNED_BYTE, myTextureData[k].data); } }
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  • might want to reformat that code Commented Mar 21, 2011 at 16:43
  • What does appear? and why are you drawing so many cubes? Commented Mar 21, 2011 at 17:12
  • How can it compile with the broken #includes? Commented Mar 21, 2011 at 18:27
  • you call drawcube within a glBegin(…)…glEnd() block. Drawcube itself opensanother glBegin(…)…glEnd() block. Those don't nest. Commented Mar 21, 2011 at 18:47

2 Answers 2

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5

You never call textureLoader().

Or glBindTexture(), other than in textureLoader(), which you don't call.

Also, don't nest glBegin()s.

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1 Comment

I also can't find glEnable(GL_TEXTURE_2D)
0

This may not directly answer your question, but I've found this Intro to Modern OpenGL very enlightening. In a simple way, it made a lot of the core concepts of the 3D math, graphics pipeline, and feeding data to OpenGL really gel with me.

If you read the first 5 posts I'm pretty sure you'll come away with a totally different perspective on how to tackle what you're trying to accomplish.

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