/[cvs]/joko/Uni/BSArch/04/bmp_fractal.c
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Diff of /joko/Uni/BSArch/04/bmp_fractal.c

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revision 1.6 by joko, Sat Jul 1 13:56:54 2006 UTC revision 1.7 by joko, Sat Jul 1 20:31:31 2006 UTC
# Line 96  void write_blank_file(char *filename) { Line 96  void write_blank_file(char *filename) {
96    
97  // arguments for each thread  // arguments for each thread
98  typedef struct _WorkerArguments {  typedef struct _WorkerArguments {
99    unsigned int start_row;    int start_row;
100    unsigned int number_of_rows;    int number_of_rows;
101    unsigned char * pBitmap;    unsigned char * pBitmap;
102  } WORKERARGS, *PWORKERARGS;  } WORKERARGS, *PWORKERARGS;
103    
# Line 107  DWORD WINAPI fractal_thread (LPVOID lpPa Line 107  DWORD WINAPI fractal_thread (LPVOID lpPa
107    // thread stuff    // thread stuff
108    int thread_id;    int thread_id;
109    PWORKERARGS args;    PWORKERARGS args;
110      unsigned char *pDataBitmapSegment;
111    
112    // fractal calculation    // fractal calculation
113    int x, y;    int x, y;
# Line 117  DWORD WINAPI fractal_thread (LPVOID lpPa Line 118  DWORD WINAPI fractal_thread (LPVOID lpPa
118    // get worker arguments    // get worker arguments
119    args = (PWORKERARGS)lpParam;    args = (PWORKERARGS)lpParam;
120        
121      printf("----------------------------------------------\n");
122    printf("thread_id: %i\n", thread_id);    printf("thread_id: %i\n", thread_id);
123    printf("arg.start_row: %i\n", args->start_row);    printf("arg.start_row: %i\n", args->start_row);
124    printf("arg.number_of_rows: %i\n", args->number_of_rows);    printf("arg.number_of_rows: %i\n", args->number_of_rows);
125    
126      // calculate pointer to beginning of segment
127      pDataBitmapSegment = (unsigned char *)((INT_PTR)args->pBitmap + (YSIZE - (args->start_row + args->number_of_rows)) * 3 * XSIZE);
128      printf("segment_start: %p\n", pDataBitmapSegment);
129        
130    // calculate fractal    // calculate fractal
131    for (y = (args->start_row + args->number_of_rows) - 1; y >= args->start_row; y--) {    for (y = (args->start_row + args->number_of_rows) - 1; y >= args->start_row; y--) {
132        //printf("calc: thread=%i; y=%i            limits: %i,%i    p: %p\n", thread_id, y, args->start_row, args->number_of_rows, pDataBitmapSegment);
133      for (x = 0; x < XSIZE; x++) {      for (x = 0; x < XSIZE; x++) {
134        getColorValuesAt(x * (2.0 / XSIZE) - 1.5, y * (2.0 / YSIZE) - 1.0, &bgr[2], &bgr[1], &bgr[0]);        getColorValuesAt(x * (2.0 / XSIZE) - 1.5, y * (2.0 / YSIZE) - 1.0, &bgr[2], &bgr[1], &bgr[0]);
135                
# Line 130  DWORD WINAPI fractal_thread (LPVOID lpPa Line 137  DWORD WINAPI fractal_thread (LPVOID lpPa
137        //printf("pointer: %p\n", pDataBitmapCurrent);        //printf("pointer: %p\n", pDataBitmapCurrent);
138                
139        // transfer color values to current pixel        // transfer color values to current pixel
140        args->pBitmap[0] = bgr[0];        pDataBitmapSegment[0] = bgr[0];
141        args->pBitmap[1] = bgr[1];        pDataBitmapSegment[1] = bgr[1];
142        args->pBitmap[2] = bgr[2];        pDataBitmapSegment[2] = bgr[2];
143                
144        // move pointer to next pixel        // move pointer to next pixel
145        args->pBitmap += 3;        pDataBitmapSegment += 3;
146                
147      }      }
148      //no padding required because 1500%4 =0      //no padding required because 1500%4 =0
149    }    }
150    
151      printf("thread finished: %i\n", thread_id);
152    return 0;    return 0;
153    
154  }  }
# Line 155  int main(int argc, char *argv[]) { Line 163  int main(int argc, char *argv[]) {
163    unsigned char *pDataBitmap, *pDataBitmapCurrent;    unsigned char *pDataBitmap, *pDataBitmapCurrent;
164    
165    // workers    // workers
166    unsigned int workers = 3;    int workers = 10;
167    unsigned int worker_index, worker_rows, worker_startrow;    int worker_index, worker_rows, worker_startrow;
168    HANDLE *worker_handles;    HANDLE *worker_handles;
169    //struct WorkerArguments *worker_args;    //struct WorkerArguments *worker_args;
170    PWORKERARGS worker_args;    PWORKERARGS worker_args;
# Line 222  int main(int argc, char *argv[]) { Line 230  int main(int argc, char *argv[]) {
230    printf("rows for each worker: %i\n", worker_rows);    printf("rows for each worker: %i\n", worker_rows);
231    for (worker_index = 0; worker_index < workers; worker_index++) {    for (worker_index = 0; worker_index < workers; worker_index++) {
232            
233        // debugging: just run with single thread
234        //if (worker_index == 1)
235        //  continue;
236        
237      // number of row to start for each worker      // number of row to start for each worker
238      worker_startrow = worker_index * worker_rows;      worker_startrow = worker_index * worker_rows;
239            
# Line 249  int main(int argc, char *argv[]) { Line 261  int main(int argc, char *argv[]) {
261    // wait for all threads    // wait for all threads
262    if (WaitForMultipleObjects(workers, worker_handles, TRUE, INFINITE) == WAIT_FAILED)    if (WaitForMultipleObjects(workers, worker_handles, TRUE, INFINITE) == WAIT_FAILED)
263      perror("WaitForMultipleObjects");      perror("WaitForMultipleObjects");
264      
265      // debugging: just run with single thread
266      //if (WaitForSingleObject(worker_handles[0], INFINITE) == WAIT_FAILED)
267      //  perror("WaitForSingleObject");
268    
269      // close all worker handles
270      for (worker_index = 0; worker_index < workers; worker_index++)
271        CloseHandle(worker_handles[worker_index]);
272        
273    /* write the result into the file */    /* write the result into the file */
274    if (!FlushViewOfFile(pData, 0)) {    if (!FlushViewOfFile(pData, 0)) {
275      err = GetLastError();      err = GetLastError();
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