From 63a2b7998c61ce7614446045aa0d0c00cb0b4d1f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Martin=20Stensg=C3=A5rd?= <mastensg@mastensg.net>
Date: Wed, 2 Nov 2016 04:22:43 +0100
Subject: add pixmap-saving version

---
 main_ppm.c | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)
 create mode 100644 main_ppm.c

(limited to 'main_ppm.c')

diff --git a/main_ppm.c b/main_ppm.c
new file mode 100644
index 0000000..27febb6
--- /dev/null
+++ b/main_ppm.c
@@ -0,0 +1,51 @@
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "ray.h"
+
+static const size_t kFramesToRender = 126;
+static const size_t kWidth = 512;
+static const size_t kHeight = 512;
+
+void save_ppm(const unsigned char *src, size_t w, size_t h, const char *fmt,
+              ...) {
+  const size_t kPathMax = 1024;
+  char path[kPathMax];
+  va_list ap;
+  size_t y, x;
+  FILE *f;
+
+  va_start(ap, fmt);
+  vsnprintf(path, kPathMax, fmt, ap);
+  va_end(ap);
+
+  f = fopen(path, "w");
+
+  fprintf(f, "P3\n%zu %zu\n%u\n", w, h, 255);
+
+  for (y = 0; y < h; ++y) {
+    for (x = 0; x < w; ++x) {
+      // R G B
+      fprintf(f, "%4u%4u%4u", src[4 * w * y + 4 * x + 0],
+              src[4 * w * y + 4 * x + 1], src[4 * w * y + 4 * x + 2]);
+    }
+    fprintf(f, "\n");
+  }
+
+  fclose(f);
+}
+
+int main() {
+  fprintf(stderr, "Rendering %zu frames\n", kFramesToRender);
+
+  unsigned char *buffer = calloc(4, kWidth * kHeight);
+
+  for (size_t i = 0; i < kFramesToRender; ++i) {
+    trace_scene(i * 0.1f, kWidth, kHeight, buffer, 1);
+    save_ppm(buffer, kWidth, kHeight, "out_%06u.ppm", i);
+    fprintf(stderr, "  %zu\n", i);
+  }
+
+  return EXIT_SUCCESS;
+}
-- 
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