OpenGL Textures are not rendering

[Teser0ck]

As the title says, the problem is that my textures are not rendering ( I am using SDL to load them ) . I am 95% sure that the files are loading right, however similar problem happened to me yet, in my previous game. Some guys didn't see spites, just blank white screen, but another guys saw it normally..
Here's some code :

Rendering system stuff

Code: Select all

RenderSystem::RenderSystem()
{
      
	PlD = new Vector2( 20, 40 );// Size of the image
	PlTex = this->LoadIMG( "yay.bmp" );

}

void RenderSystem::BindTexture( GLuint Texture )
{
	   glBindTexture(GL_TEXTURE_2D, Texture);

}

void RenderSystem::PrepareScene( )
{
	   glEnable(GL_TEXTURE_2D);

	   glPushMatrix();   
	   glColor3f( 1.0, 1.0, 1.0 );
	   glBegin (GL_QUADS);

}

void RenderSystem::RenderScene( Rect *POS, Rect *SRC )
{

	   glTexCoord2f( SRC->x / SRC->w, SRC->y / SRC->h);
	   glVertex2f(POS->x,POS->y);

      glTexCoord2f( ( SRC->x + SRC->w ) / SRC->w, SRC->y / SRC->h);
	   glVertex2f(POS->x + POS->w, POS->y);

      glTexCoord2f( ( SRC->x + SRC->w ) / SRC->w, ( SRC->y + SRC->h ) / SRC->h);
	   glVertex2f(POS->x + POS->w, POS->y + POS->h);

      glTexCoord2f( SRC->x / SRC->w, ( SRC->y + SRC->h ) / SRC->h);
	   glVertex2f(POS->x, POS->y + POS->h);
   

}

void RenderSystem::EndScene( )
{

	   glEnd();
	   glPopMatrix();

}


GLuint RenderSystem::LoadIMG( std::string Name )
{


	glEnable(GL_TEXTURE_2D);

    SDL_Surface *Surface = NULL;
    GLenum texture_format = NULL;
    GLuint tex = 0;
    GLint  nOfColors = 0;

   if ( (Surface = IMG_Load(Name.c_str())) ) { 
   



		if ( !isPowerOfTwo(Surface->w) ) {
			printf("image.bmp's width is not a power of 2\n");
		}
	 

		if ( !isPowerOfTwo(Surface->h) ) {
			printf("image.bmp's height is not a power of 2\n");
		}
	
			nOfColors = Surface->format->BytesPerPixel;
			if (nOfColors == 4)     // contains an alpha channel
			{
					if (Surface->format->Rmask == 0x000000ff)
							texture_format = GL_RGBA;
					else
							texture_format = GL_BGRA;
			} else if (nOfColors == 3)     // no alpha channel
			{
					if (Surface->format->Rmask == 0x000000ff)
							texture_format = GL_RGB;
					else
							texture_format = GL_BGR;
			} 


	 

			glGenTextures( 1, &tex );
			glBindTexture( GL_TEXTURE_2D, tex );
	 

	 

			glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR );
			glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );

			glEnable(GL_TEXTURE_2D);

	 

		glTexImage2D( GL_TEXTURE_2D, 0, nOfColors, Surface->w, Surface->h, 0,
						  texture_format, GL_UNSIGNED_BYTE, Surface->pixels );
	} 
   else
   {
      std::cout<<"\nNOT LOADED\n";
   }
    SDL_FreeSurface(Surface);


	return tex;
}

Sprite.cpp

Code: Select all

Sprite::Sprite( GLuint Tex, Vector2 *Dims, Vector2 *SoC )
{

	M_Tex  = Tex; // texture
	M_Dims = Dims; // dimensions of my texture
	M_SoC  = SoC; // Size of one clip

	Box = new Rect( 0.0, 0.0, M_SoC->x, M_SoC->y );

}

void Sprite::Draw( int Part )
{
   
   AssetManager::GetRSInstance()->BindTexture( M_Tex );
   
   CBox = new Rect( Part * M_SoC->x,  M_SoC->y, Part * M_SoC->x + M_SoC->x, M_SoC->y );
   
   AssetManager::GetRSInstance()->PrepareScene();
   AssetManager::GetRSInstance()->RenderScene( Box, CBox );
   AssetManager::GetRSInstance()->EndScene();

}

Player

Code: Select all

Player::Player()
{


RS = AssetManager::GetRSInstance();// RenderSystem

...

m_SoC = new Vector2( 16, 16 ); // Size of one Clip

SPR = new Sprite( RS->PlTex, RS->PlD, m_SoC );

...

}

void Player::Show(SDL_Rect camera,int MAX_X,int MAX_Y,int LAYER,int xOff,int yOff)
{
     
..

SPR->Draw(0);

..

}

[N64vSNES]

Just glanced through your code but I quickly noticed this:

Code: Select all

void Sprite::Draw( int Part )
{
   
   AssetManager::GetRSInstance()->BindTexture( M_Tex );
   
   CBox = new Rect( Part * M_SoC->x,  M_SoC->y, Part * M_SoC->x + M_SoC->x, M_SoC->y );
   
   AssetManager::GetRSInstance()->PrepareScene();
   AssetManager::GetRSInstance()->RenderScene( Box, CBox );
   AssetManager::GetRSInstance()->EndScene();

}

And here:

Code: Select all

void RenderSystem::PrepareScene( )
{
      glEnable(GL_TEXTURE_2D);

      glPushMatrix();   
      glColor3f( 1.0, 1.0, 1.0 );
      glBegin (GL_QUADS);

}

You bind the texture before calling PrepareScene() and you enable texturing in PrepareScene(), so try switching it the other way around.

[Teser0ck]

Thanks for the tip, unfortunately this didn't solved the problem

[N64vSNES]

Thanks for the tip, unfortunately this didn't solved the problem

Well I don't see anything else wrong with the code you've provided.

Try posting your image loading code and your initialization code.
Perhaps there is something wrong there.

[Teser0ck]

Image loading code is in Render.cpp code, here's my initialization code :

( main.cpp )

Code: Select all

void Init()
{

..

           SDL_Init(SDL_INIT_EVERYTHING);
	   SDL_SetVideoMode( 640, 480, 32, SDL_HWSURFACE | SDL_DOUBLEBUF | SDL_OPENGL);
           // ^ I changed these two while ago and screen changed color from white to black 

	   glEnable( GL_TEXTURE_2D );


	   glClearColor(0.0f, 0.0f, 0.0f, 0.0f);

	   glMatrixMode(GL_PROJECTION);
	   glLoadIdentity();

	   glOrtho(0.0f, 640, 480, 0.0f, -1.0f, 1.0f);

	   glMatrixMode(GL_MODELVIEW);
	   glLoadIdentity();

    
...

}

int main( int argc, char* args[] )//--------------------------INT MAIN----------------------
{	 

	 Init();// initialize everything
         ....
}

[N64vSNES]

You you completely and totally sure your textures are getting loaded correctly?

[Teser0ck]

Yeah, I am pretty sure it's getting loaded right. I have done some tests. Only thing I found is that my GLuint Texture is still equal to zero ( after loading an image )

[Ginto8]

If the texture names are 0, that means that the texture has not loaded correctly. Move your "glEnable(GL_TEXTURE_2D);" to before "glGenTextures(...);", and make sure an OpenGL context is present when the textures are generated.

If only certain people are saying it's white, it may be an issue with non-power of 2 textures. I remember a similar problem, but I don't know if it applies here.

[Teser0ck]

Yes, my texture's width and height is power of two. I tried to make a function Load instead of loading textures right in constructor and I put it in main after Init(), so now it says the value of Texture is 1, but it still is not rendering.

[Teser0ck]

SOLVED !!!
After making the function Load and putting function BindTexture after PrepareScene when rendering it finally works !
Thanky you all for help

[N64vSNES]

SOLVED !!!
After making the function Load and putting function BindTexture after PrepareScene when rendering it finally works !
Thanky you all for help

Glad you've solved it

[Teser0ck]

Yeah, thanks. At last I am gonna post some videos about the game