Thread: Trying to load RAW file textures please help (c and openGL)

Hiya
Im writing a program in C using openGL (GLUT) and im having a little trouble with the function to process textures (RAW files). It compiles ok but when i bind the texture in my display function and apply it to a quad it does not display it at runtime (just has a simple RGB default colour i had assigned with glColor3f). It has to be because its not allocating the memory correctly with the malloc i think? but i cant think of a way to just get it working, can anyone please maybe help me.. Pretty please? Im getting really frustrated lol.

Below is the texture processing function:

Code:

// load a 256x256 RGB .RAW file as a texture
GLuint LoadTextureRAW( const char * filename, int wrap ) {

  GLuint texture;
  int width, height;
  BYTE * data;
  FILE * file;

  // open texture data
  file = fopen( filename, "rb" );
  if ( file == NULL ) return 0;

  // allocate buffer
  width	 = 256;
  height = 256;
  data = (BYTE*)malloc( width * height * 3 );  // <---- is this right?

  // read texture data
  fread( data, width * height * 3, 1, file );
  fclose( file );

  // allocate a texture name
  glGenTextures( 1, &texture );

  // select our current texture
  glBindTexture( GL_TEXTURE_2D, texture );

  // select modulate to mix texture with color for shading
  glTexEnvf( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE );

  // when texture area is small, bilinear filter the closest MIP map
  glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_NEAREST );
  // when texture area is large, bilinear filter the first MIP map
  glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );

  // if wrap is true, the texture wraps over at the edges (repeat)
  //       ... false, the texture ends at the edges (clamp)
  glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, wrap ? GL_REPEAT : GL_CLAMP );
  glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, wrap ? GL_REPEAT : GL_CLAMP );

  // build our texture MIP maps
  gluBuild2DMipmaps( GL_TEXTURE_2D, 3, width, height, GL_RGB, GL_UNSIGNED_BYTE, data );

  // free buffer
  free( data );

  return texture;
}

Im using it like this (just showing the parts that matter):

Code:

GLuint texture;
texture = LoadTextureRAW("bush.raw", TRUE);

glBindTexture(GL_TEXTURE_2D, texture);

glBegin(GL_QUADS);				
	glColor3f(0.0, 0.6, 0.0); //Just the default colour
	glTexCoord2f(0.0,0.0);
	glVertex3f(-1000.0, 0.0, 1000.0);
	glTexCoord2f(0.0,1.0);
	glVertex3f(1000.0, 0.0, 1000.0);
	glTexCoord2f(1.0,1.0); 
	glVertex3f(1000.0, 0.0, -1000.0);
	glTexCoord2f(1.0,0.0); 
	glVertex3f(-1000.0, 0.0, -1000.0);		
glEnd();

I really need to get this working

Thanks.

Just because you bound a texture doesn't mean it's glEnable()'ed.