Which is the Directx function to load bitmap for height maps
Author
Hi,
could someone tell me which is the function to load bitmap for height maps?
Thanks
Kev
easiest way (use it with a 16 bit bitmap for best results)
open the file using fopen or whatever type of stream open function you prefer, then load the bitmapinfoheader and the bitmap info, then create a mesh from the loaded data.
i may be wrong (i dont know anything about the sample framework, it may be in there) but i dont believe there is any function to directly load a heightmap from a bitmap.
___________________
-Nicholas Anton, Owner RaptorTech
-Admin(at)Raptor85.com
open the file using fopen or whatever type of stream open function you prefer, then load the bitmapinfoheader and the bitmap info, then create a mesh from the loaded data.
i may be wrong (i dont know anything about the sample framework, it may be in there) but i dont believe there is any function to directly load a heightmap from a bitmap.
___________________
-Nicholas Anton, Owner RaptorTech
-Admin(at)Raptor85.com
I'm reluctant to do this, because this code screams COPY-PASTE ME, but here is code that'll load a bitmap for you.
This will return a pointer to the bitmap data, and will give you the width, height, and bit depth of the bitmap data via reference parameters. You'll then have to process that into a heightmap.
[edited by - Promit on April 13, 2004 10:07:03 PM]
#define WIN32_LEAN_AND_MEAN#include <windows.h>#include <cstdio>unsigned char* ReadBitmap( const char* FileName, int& Width, int& Height, int& bpp ){ BITMAPFILEHEADER Header; BITMAPINFOHEADER Info; FILE* fp; unsigned char* RawData; fp = fopen( FileName, "rb" ); if( fp== NULL ) { fclose( fp ); return NULL; } //read in the heightmap data fread( &Header, sizeof(Header), 1, pMap ); fread( &Info, sizeof(Info), 1, pMap ); fseek( pMap, Header.bfOffBits, SEEK_SET ); //notice these are all reference parameters Width = Info.biWidth; Height = Info.biHeight; bpp = Info.biBitCount; RawData = new unsigned char[Width*Height*bpp]; fread( RawData, 1, Width*Height*bpp, fp ); fclose( fp ); return RawData;}This will return a pointer to the bitmap data, and will give you the width, height, and bit depth of the bitmap data via reference parameters. You'll then have to process that into a heightmap.
[edited by - Promit on April 13, 2004 10:07:03 PM]
Oh for gods sake, please don't use a new inside the function! Just make it return the data to a user defined pointer and let the function be made queryable so they can make the correct size buffer.
Usage:
Please note I didn't compile this so please don't flame me if something's a bit askew.
@Promit: Don't take it personally, I just have a personal thing with new inside of functions (who ever remembers to delete afterwards?)
EDIT: Promit, how did you get pretty spacing inside your [ source]? I've never been able to do that!
[edited by - ms291052 on April 13, 2004 10:40:58 PM]
#define WIN32_LEAN_AND_MEAN#include <windows.h>#include <cstdio>void ReadBitmap(unsigned char** RawData, const char* FileName, int* Width, int* Height, int* bpp ){BITMAPFILEHEADER Header;BITMAPINFOHEADER Info;FILE* fp;fp = fopen( FileName, "rb" );if( fp== NULL ){fclose( fp );return;}//read in the heightmap datafread( &Header, sizeof(Header), 1, pMap );fread( &Info, sizeof(Info), 1, pMap );fseek( pMap, Header.bfOffBits, SEEK_SET );//notice these are all reference parametersif(Width != NULL)Width = Info.biWidth;if(Height != NULL)Height = Info.biHeight;if(bpp != NULL)bpp = Info.biBitCount;if(RawData == NULL)return;fread( *RawData, 1, Info.biWidth*Info.biHeight*Info.biBitCount, fp );fclose( fp );}Usage:
int Width=0, Height=0, bpp=0;unsigned char* BitmapInfo;//Query for Width, Height and BPPReadBitmap(NULL, "somefile.bmp", &Width, &Height, &bpp );//Create buffer for infoBitmapInfo = new unsigned char[Width*Height*bpp];//Read in infoReadBitmap(&BitmapInfo, "somefile.bmp", NULL, NULL, NULL);Please note I didn't compile this so please don't flame me if something's a bit askew.
@Promit: Don't take it personally, I just have a personal thing with new inside of functions (who ever remembers to delete afterwards?)
EDIT: Promit, how did you get pretty spacing inside your [ source]? I've never been able to do that!
[edited by - ms291052 on April 13, 2004 10:40:58 PM]
First off, I don''t see any problem with using new inside a function as long as you make it pretty clear that somebody is going to have to delete it afterwards. Although my version of the code is actually inside a class whch deals with its pointers itself, so there''s no real need. Not to mention I don''t like the querying thing.
As for the pretty spacing, I used the space bar. A lot.
As for the pretty spacing, I used the space bar. A lot.
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