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Invisible textures!?

2 posts in this topic

Hi, writing a simple model loader/viewer with not very much OpenGL experience: most of what I know comes from NeHe''s excellent tuts. I got me a simple cube, drawn & lit, and now I want to texture it. So I load up a TGA and build the textures, only no texture on the cube. Can anyone explain what is going on please?
typedef struct {
	//pointer to image data (up to 32 bit)

	GLubyte *imageData;
	//image colour depth in bits per pixel

	GLuint bpp;
	GLuint width;
	GLuint height;

	GLuint texID;
} TextureImage;

//storage for one texture

TextureImage textures[1];

bool loadTGA(TextureImage* texture, char* filename) {

									//File loading stuff goes in here




	// Build A Texture From The Data

	glGenTextures(1, &texture[0].texID);					// Generate OpenGL texture IDs

	glBindTexture(GL_TEXTURE_2D, texture[0].texID);			// Bind Our Texture

	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);	// Linear Filtered

	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);	// Linear Filtered

	if (texture[0].bpp==24)									// Was The TGA 24 Bits

		type=GL_RGB;										// If So Set The ''type'' To GL_RGB


	glTexImage2D(GL_TEXTURE_2D, 0, type, texture[0].width, texture[0].height, 0, type, GL_UNSIGNED_BYTE, texture[0].imageData);

return true;

bool init(void) {

	if (!loadTGA(&textures[0], "crate.tga"))
		return false;


	GLfloat mat_specular[] =	{1.0, 1.0, 1.0, 1.0};
	GLfloat mat_shininess[] =	{ 50.0 };
	GLfloat light_position[] =	{1.0, 1.0, 1.0, 0.0 };
	GLfloat white_light[] =		{1.0, 1.0, 1.0, 1.0};
	glClearColor(0.0, 0.0, 0.0, 0.0);
	glMaterialfv(GL_FRONT, GL_SPECULAR, mat_specular);
	glMaterialfv(GL_FRONT, GL_SHININESS, mat_shininess);
	glBindTexture(GL_TEXTURE_2D, textures[0].texID);
	glLightfv(GL_LIGHT0, GL_POSITION, light_position);
	glLightfv(GL_LIGHT0, GL_DIFFUSE, white_light);
	glLightfv(GL_LIGHT0, GL_SPECULAR, white_light);


	return true;	


void display(void) {
	//glutSolidSphere(1.0, 20, 16);

	//save previous settings, in this case camera settings


	//xrot += 3;

	//yrot += 3;

	glTranslatef(0.0, 0.0, zpos);

	glRotatef(xrot, 1.0, 0.0, 0.0);
	glRotatef(yrot, 0.0, 1.0, 0.0);


	//discard the modelling transformations




Any help much appreciated =] ch00ns

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