A-M baby

Task/Image-noise/C/image-noise-1.c

@@ -0,0 +1,50 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <time.h>
+#include <SDL/SDL.h>
+
+unsigned int frames = 0;
+unsigned int t_acc = 0;
+
+void print_fps ()
+{
+  static Uint32 last_t = 0;
+  Uint32 t = SDL_GetTicks();
+  Uint32 dt = t - last_t;
+  t_acc += dt;
+  if (t_acc > 1000)
+  {
+    unsigned int el_time = t_acc / 1000;
+    printf("- fps: %g\n",
+            (float) frames / (float) el_time);
+    t_acc = 0;
+    frames = 0;
+  }
+  last_t = t;
+}
+
+void blit_noise(SDL_Surface *surf)
+{
+  unsigned int i;
+  long dim = surf->w * surf->h;
+  while (1)
+  {
+    SDL_LockSurface(surf);
+    for (i=0; i < dim; ++i) {
+      ((unsigned char *)surf->pixels)[i] = ((rand() & 1) ? 255 : 0);
+    }
+    SDL_UnlockSurface(surf);
+    SDL_Flip(surf);
+    ++frames;
+    print_fps();
+  }
+}
+
+int main(void)
+{
+  SDL_Surface *surf = NULL;
+  srand((unsigned int)time(NULL));
+  SDL_Init(SDL_INIT_TIMER | SDL_INIT_VIDEO);
+  surf = SDL_SetVideoMode(320, 240, 8, SDL_DOUBLEBUF | SDL_HWSURFACE);
+  blit_noise(surf);
+}

Task/Image-noise/C/image-noise-2.c

@@ -0,0 +1,47 @@
+#include <GL/glut.h>
+#include <GL/gl.h>
+#include <stdio.h>
+#include <time.h>
+
+#define W 320
+#define H 240
+#define slen W * H / sizeof(int)
+
+time_t start, last;
+
+void render()
+{
+	static int frame = 0, bits[slen];
+	register int i = slen, r;
+	time_t t;
+
+	r = bits[0] + 1;
+	while (i--) r *= 1103515245, bits[i] = r ^ (bits[i] >> 16);
+
+	glClear(GL_COLOR_BUFFER_BIT);
+	glBitmap(W, H, 0, 0, 0, 0, (void*)bits);
+	glFlush();
+
+	if (!(++frame & 15)) {
+		if ((t = time(0)) > last) {
+			last = t;
+			printf("\rfps: %ld  ", frame / (t - start));
+			fflush(stdout);
+		}
+	}
+}
+
+int main(int argc, char **argv)
+{
+	glutInit(&argc, argv);
+	glutInitDisplayMode(GLUT_INDEX);
+	glutInitWindowSize(W, H);
+	glutCreateWindow("noise");
+	glutDisplayFunc(render);
+	glutIdleFunc(render);
+
+	last = start = time(0);
+
+	glutMainLoop();
+	return 0;
+}