Elysian Shadows

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sampler2D Tex;
vec2 TexCoords;

int main()
{
     vec4 ColorKey = texture2D(Tex, TexCoords); 
             
     if (ColorKey.rgb == vec3(*Your R, G, B goes here*))
          discard; 
   
     gl_FragColor = color;
}

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

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SDL_Surface *TMP = IMG_Load( TheImage ) // Load the image

SDL_SetColorKey ( TMP->format , SDL_SRCCOLORKEY, SDL_MapRGB ( TMP->format, 0xff, 0x00, 0xff ) ); // set the color key

SDL_Surface *Surface = SDL_DisplayAlphaFormat( TMP ); // Transfer the surface over with its current alpha format

SDL_FreeSurface ( TMP ); // We no longer need the old surface so free it

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GLtexture2d Video::LoadTexture( const char *filename )
{
	//Create the nessasary variables
	SDL_Surface *surface;
    GLuint textureid;
    int mode;
	GLtexture2d texture;

	//Load the specified image into the SDL_Surface *surface variable
    surface = IMG_Load( filename );
	//texture.filename = filename;

	//Color key the texture
	/*for( int x = 0; x <= surface->w; x++ )
	{
		for( int y = 0; y <= surface->h; y++ )
		{
			SDL_Color pixel = TranslateColor( GetPixel( surface, x, y ) );
			if( pixel.r == keyR && pixel.g == keyG && pixel.b == keyB )
			{
				Uint32 pixel32 = SDL_MapRGBA( surface->format, 0, 0, 255, 0 );
				SetPixel( surface, x, y, pixel32 );
			}
		}
	}*/

	//If there are only 3 Bytes ( 24 bits ) per pixel
    if( surface->format->BytesPerPixel == 3 )
	{
		//Set the OpenGL color schema to Red Green Blue 24bit
        mode = GL_RGB;
    }
	//If there are 4 Bytes ( 32 bits ) per pixel
	else if( surface->format->BytesPerPixel == 4 )
	{
		//Set the OpenGL color schema to Red Green Blue Alpha 32bit
		mode = GL_RGBA;

    }
	else
	{
		//Free unnessasary memory
        SDL_FreeSurface( surface );
    }
	
	//Set the textures width and height variables
	texture.w = (float)surface->w;
	texture.h = (float)surface->h;
    
	//Generate a texture ID number
    glGenTextures( 1, &textureid );

	//If this texture has been loaded before delete the curent texture before making a new one
	glDeleteTextures( 1, &texture.ID );

	//Bind that ID number to a type ( I guess )
    glBindTexture( GL_TEXTURE_2D, textureid );

	//No clue
	//TODO:Lookup glTexImage2d()
    glTexImage2D( GL_TEXTURE_2D, 0, mode, surface->w, surface->h, 0, mode, GL_UNSIGNED_BYTE, surface->pixels );

	//Set the parameters fot the texture
    glTexParameteri( GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_NEAREST );
    glTexParameteri( GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR );

	//Clean up
    SDL_FreeSurface( surface );

	//Set the texture's ID number to the correct texture ID
	texture.ID = textureid;

	//Set the textures properties to default
	texture.scale = 1;
	texture.zAngle = 0;

	////Add a pointer to the current texture to thhe textures list
	//textures.push_back( &texture );

	//Return the texture
    return texture;
}

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void Video::DrawTexture( float x, float y, GLtexture2d texture )
{
	//Get ready for the drawing
	//glBindTexture( GL_TEXTURE_2D, texture.ID );
    glEnable( GL_TEXTURE_2D );
	glTranslatef( x + ( texture.w / 2 ), y  + ( texture.h / 2 ), 0 );
	
	//Make ABSOLUTELY SURE THAT THERE ARE NO COLOR SCREW UPS
	glColor3f( 1, 1, 1 );

	//Add the special properties
	glScalef( texture.scale, texture.scale, texture.scale );
	glRotatef( texture.zAngle, 0, 0, 1.0 );

    //Make a rectangle
    glBegin( GL_QUADS );

    //Top Left
    glTexCoord2i( 0, 0 );
    glVertex3f( -texture.w / 2, -texture.h / 2, 0 );

    //Top Right
    glTexCoord2i( 1, 0 );
    glVertex3f( texture.w / 2, -texture.h / 2, 0 );

    //Bottom Right
    glTexCoord2i( 1, 1 );
    glVertex3f( texture.w / 2, texture.h / 2, 0 );

    //Bottom Left
    glTexCoord2i( 0, 1 );
    glVertex3f( -texture.w / 2, texture.h / 2, 0 );

	//Finish the drawing
    glEnd();
    glDisable( GL_TEXTURE_2D );
}