feat: add rasterization primitives

src/main.c

@@ -2,31 +2,58 @@
 #include "stdio.h"
 #include "stdlib.h"
 
+#include "./core/raster.h"
 #include "./ui/uicontroller.h"
 #include "./ui/vektorcanvas.h"
 
-
-static void on_map(GtkWidget* window, gpointer user_data) {
-  vektor_uictrl_map((VektorWidgetState*)user_data);
+static void on_map(GtkWidget *window, gpointer user_data) {
+  vektor_uictrl_map((VektorWidgetState *)user_data);
 }
 
 static void activate(GtkApplication *app, gpointer user_data) {
 
-  VektorWidgetState* widget_state = (VektorWidgetState*)malloc(sizeof(VektorWidgetState));
+  VektorWidgetState *widget_state =
+      (VektorWidgetState *)malloc(sizeof(VektorWidgetState));
   vektor_uictrl_init(app, widget_state);
 
-  VektorCanvas* canvas = (VektorCanvas*)malloc(sizeof(VektorCanvas));
+  VektorCanvas *canvas = (VektorCanvas *)malloc(sizeof(VektorCanvas));
   vektor_canvas_init(widget_state, canvas);
   VektorCanvasColor red = vektor_color_new(255, 0, 0, 255);
   vektor_canvas_fill(canvas, &red);
   vektor_canvas_update(canvas);
 
-  g_signal_connect(widget_state->window, "map", G_CALLBACK(on_map), widget_state);
+  g_signal_connect(widget_state->window, "map", G_CALLBACK(on_map),
+                   widget_state);
 
   gtk_window_present(widget_state->window);
 }
 
+void write_ppm(const char *path, const Framebuffer *fb) {
+  FILE *f = fopen(path, "wb");
+  if (!f)
+    abort();
+
+  fprintf(f, "P6\n%d %d\n255\n", fb->width, fb->height);
+  fwrite(fb->pixels, 1, fb->width * fb->height * 3, f);
+  fclose(f);
+}
+
 int main(int argc, char **argv) {
+  Framebuffer fb = mk_framebuffer(256, 256);
+  EdgeBuffer edges = {0};
+
+  Polygon pg = *mk_polygon();
+  add_point_polygon(&pg, (V2){50, 50});
+  add_point_polygon(&pg, (V2){200, 80});
+  add_point_polygon(&pg, (V2){120, 200});
+
+  flatten_polygon(&edges, &pg);
+
+  for (size_t i = 0; i < edges.count; i++) {
+    draw_line(&fb, edges.edges[i].p1, edges.edges[i].p2, 255, 255, 255);
+  }
+
+  write_ppm("out.ppm", &fb);
 
   GtkApplication *app;
   int status;