bool initGL(void) {
GLenum glewError = glewInit();
if (glewError != GLEW_OK) {
fprintf(stderr, "Error initializing GLEW!\n%s\n", glewGetErrorString(glewError));
return false;
}
if (!GLEW_VERSION_3_1) {
fprintf(stderr, "OpenGL 3.1 not supported!\n");
return false;
}
glViewport(0.0f, 0.0f, SCREEN_WIDTH, SCREEN_HEIGHT);
glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
glEnable(GL_TEXTURE_2D);
glEnable(GL_BLEND);
glDisable(GL_DEPTH_TEST);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
GLenum error = glGetError();
if (error != GL_NO_ERROR) {
fprintf(stderr, "Error initializing OpenGL!\n%s\n", gluErrorString(error));
return false;
}
ilInit();
iluInit();
ilClearColor(255, 255, 255, 000);
ILenum ilError = ilGetError();
if (ilError != IL_NO_ERROR) {
fprintf(stderr, "Unable to initialize DevIL!\n%s\n", iluErrorString(ilError));
return false;
}
if (!LFont::initFreetype()) {
fprintf(stderr, "Unable to initialize Truetype!\n");
}
return true;
}
//Load----------------------------------------------------------------------
bool TextureItem::Load( GLuint minFilter, GLuint maxFilter, bool forceMipmap, bool resizeIfNeeded )
{
/** NOTE: This is a test of using an archive file. This will need to
be modified to allow direct file access, or archived file access.
*/
ArchiveFile* file = ArchiveManager::GetSingleton().CreateArchiveFile( mImageFileName );
if ( file )
{
UInt32 fileSize = file->Length();
unsigned char* buf = new unsigned char [ fileSize ];
if ( !buf )
{
delete file;
return false;
}
file->Read( buf, fileSize );
// Load the texture:
//****
ilInit();
iluInit();
// Make sure the DevIL version is valid:
if ( ilGetInteger( IL_VERSION_NUM ) < IL_VERSION || iluGetInteger( ILU_VERSION_NUM ) < ILU_VERSION )
{
// Invalid version...
delete file;
delete buf;
return false;
}
// Get the decompressed data
ILuint imageID;
ilGenImages( 1, &imageID );
ilBindImage( imageID );
//if ( ilLoadImage( const_cast< char* >( mImageFileName.c_str() ) ) )
if ( ilLoadL( IL_TYPE_UNKNOWN, buf, fileSize ) )
{
// Convert the image to unsigned bytes:
ilConvertImage( IL_RGBA, IL_UNSIGNED_BYTE );
// Generate the GL texture
glGenTextures( 1, &mTextureID );
glBindTexture( GL_TEXTURE_2D, mTextureID );
mWidth = ilGetInteger( IL_IMAGE_WIDTH );
mHeight = ilGetInteger( IL_IMAGE_HEIGHT );
mOriginalWidth = mWidth;
mOriginalHeight = mHeight;
// OpenGL will work better with textures that have dimensions
// that are a power of 2. If doing a scrolling tile map, then
// this is pretty much a necessity. However, there are times
// when using a mipmap instead is perfectly fine (ie, when NOT
// doing tiles, or in cases where we might be running out of
// video memory...
if ( resizeIfNeeded && !forceMipmap )
{
UInt32 newWidth = mWidth, newHeight = mHeight;
if ( !Math::IsPowerOf2( mWidth ) )
{
// Find the next power of 2:
newWidth = Math::FindNextPowerOf2( mWidth );
}
if ( !Math::IsPowerOf2( mHeight ) )
{
// Find the next power of 2:
newHeight = Math::FindNextPowerOf2( mHeight );
}
if ( newWidth != mWidth || newHeight != mHeight )
{
// Resize the canvas:
ilClearColor( 0, 0, 0, 0 );
iluImageParameter( ILU_PLACEMENT, ILU_UPPER_LEFT );
iluEnlargeCanvas( newWidth, newHeight, ilGetInteger( IL_IMAGE_DEPTH ) );
mWidth = ilGetInteger( IL_IMAGE_WIDTH );
mHeight = ilGetInteger( IL_IMAGE_HEIGHT );
}
}
// If forcing mipmap generation, or if the size is not a power of 2,
// generate as mipmaps
if ( forceMipmap || !Math::IsPowerOf2( mWidth ) || !Math::IsPowerOf2( mHeight ) )
{
gluBuild2DMipmaps( GL_TEXTURE_2D,
ilGetInteger( IL_IMAGE_BPP ),
mWidth,
mHeight,
ilGetInteger( IL_IMAGE_FORMAT ),
GL_UNSIGNED_BYTE,
ilGetData() );
}
else
{
glTexImage2D( GL_TEXTURE_2D,
0,
ilGetInteger( IL_IMAGE_BPP ),
mWidth,
mHeight,
0,
ilGetInteger( IL_IMAGE_FORMAT ),
GL_UNSIGNED_BYTE,
ilGetData() );
}
// Set the minification and magnification filters
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, minFilter );
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, maxFilter );
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP );
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP );
mIsLoaded = true;
}
else
{
ILenum error;
error = ilGetError();
//std::string errString = iluErrorString( error );
}
ilDeleteImages( 1, &imageID );
//***
// Free memory:
delete buf;
delete file;
}
else
return false;
return true;
}
