no need for the line-wise function anymore

multibrot-openmp.c

@@ -44,40 +44,6 @@ pixel_t incolor() {
   return 0x00000000;            /* black */
 }
 
-/* Computes the visual representation of a mandelbrot set for a given line. */
-void compmandelbrot_line(bitmap_t * mbrot, size_t y) {
-
-  for (size_t x = 0; x < mbrot->width; x++) {
-
-    float complex c = ((3.0f * x / mbrot->width) - 2.0f)
-                      + I * ((2.0f * y / mbrot->height) - 1.0f);
-
-    bool diverges = false;
-    float complex z = 0;
-
-    int it;
-    for (it = 1; it <= max_it; it++) {
-      /* z = z² + c */
-      z = cpowf(z, 2) + c;
-
-      /* If |z| ever gets greater than 2, it diverges. */
-      if (cabsf(z) > 2) {
-        diverges = true;
-        break;
-      }
-    }
-
-    uint32_t color;
-    if (diverges) {
-      color = outcolor(it);
-    } else {
-      color = incolor();
-    }
-
-    size_t i = y * mbrot->width + x;
-    mbrot->pixels[i] = color;
-  }
-}
 
 /* Mandelbrot bitmap. */
 bitmap_t *mbrot;
@@ -129,13 +95,13 @@ static int save_png_to_file(bitmap_t * bitmap, const char *path) {
 
   /* Set image attributes. */
   png_set_IHDR(png_ptr,
-               info_ptr,
-               bitmap->width,
-               bitmap->height,
-               depth,
-               PNG_COLOR_TYPE_RGB,
-               PNG_INTERLACE_NONE,
-               PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
+      info_ptr,
+      bitmap->width,
+      bitmap->height,
+      depth,
+      PNG_COLOR_TYPE_RGB,
+      PNG_INTERLACE_NONE,
+      PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
 
   /* Initialize rows of PNG. */
   row_pointers = png_malloc(png_ptr, bitmap->height * sizeof(png_byte *));
@@ -184,9 +150,38 @@ int main() {
   assert(mbrot->pixels != NULL);
 
   /* Compute. */
-  #pragma omp parallel for
+  #pragma omp parallel for schedule (dynamic, 50000)
   for (unsigned int y = 0; y < mbrot->height; y++) {
-    compmandelbrot_line(mbrot, y);
+    for (size_t x = 0; x < mbrot->width; x++) {
+
+      float complex c = ((3.0f * x / mbrot->width) - 2.0f)
+        + I * ((2.0f * y / mbrot->height) - 1.0f);
+
+      bool diverges = false;
+      float complex z = 0;
+
+      int it;
+      for (it = 1; it <= max_it; it++) {
+        /* z = z² + c */
+        z = cpowf(z, 2) + c;
+
+        /* If |z| ever gets greater than 2, it diverges. */
+        if (cabsf(z) > 2) {
+          diverges = true;
+          break;
+        }
+      }
+
+      uint32_t color;
+      if (diverges) {
+        color = outcolor(it);
+      } else {
+        color = incolor();
+      }
+
+      size_t i = y * mbrot->width + x;
+      mbrot->pixels[i] = color;
+    }
   }
 
   /* Save PNG. */