void render()
{
//Clear color buffer
glClear( GL_COLOR_BUFFER_BIT );
//Calculate texture maxima
GLfloat textureRight = (GLfloat)SCREEN_WIDTH / (GLfloat)gRepeatingTexture.textureWidth();
GLfloat textureBottom = (GLfloat)SCREEN_HEIGHT / (GLfloat)gRepeatingTexture.textureHeight();
//Use repeating texture
glBindTexture( GL_TEXTURE_2D, gRepeatingTexture.getTextureID() );
//Switch to texture matrix
glMatrixMode( GL_TEXTURE );
//Reset transformation
glLoadIdentity();
//Scroll texture
glTranslatef( gTexX / gRepeatingTexture.textureWidth(), gTexY / gRepeatingTexture.textureHeight(), 0.f );
//Render
glBegin( GL_QUADS );
glTexCoord2f( 0.f, 0.f ); glVertex2f( 0.f, 0.f );
glTexCoord2f( textureRight, 0.f ); glVertex2f( SCREEN_WIDTH, 0.f );
glTexCoord2f( textureRight, textureBottom ); glVertex2f( SCREEN_WIDTH, SCREEN_HEIGHT );
glTexCoord2f( 0.f, textureBottom ); glVertex2f( 0.f, SCREEN_HEIGHT );
glEnd();
//Update screen
glutSwapBuffers();
}
void handleKeys( unsigned char key, int x, int y )
{
//If q is pressed
if( key == 'q' )
{
//Bind texture for modification
glBindTexture( GL_TEXTURE_2D, gStretchedTexture.getTextureID() );
//Toggle linear/nearest filtering
if( gFiltering != GL_LINEAR )
{
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR );
gFiltering = GL_LINEAR;
}
else
{
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST );
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST );
gFiltering = GL_NEAREST;
}
//Unbind texture
glBindTexture( GL_TEXTURE_2D, NULL );
}
}
void handleKeys( unsigned char key, int x, int y )
{
//If q is pressed
if( key == 'q' )
{
//Cycle through texture reptetitions
gTextureWrapType++;
if( gTextureWrapType >= 2 )
{
gTextureWrapType = 0;
}
//Set texture repetition
glBindTexture( GL_TEXTURE_2D, gRepeatingTexture.getTextureID() );
switch( gTextureWrapType )
{
case 0:
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT );
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT );
printf( "%d: GL_REPEAT\n", gTextureWrapType );
break;
case 1:
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP );
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP );
printf( "%d: GL_CLAMP\n", gTextureWrapType );
break;
}
}
}