1 files changed, 70 insertions, 0 deletions
diff --git a/tests/common_linux.h b/tests/common_linux.h
new file mode 100644
index 0000000..167b483
--- /dev/null
+++ b/tests/common_linux.h
@@ -0,0 +1,70 @@
+#include <rgl.h>
+
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/mman.h>
+
+#define crashErrno() RGL_CRASH(strerror(errno))
+#define assertErrno(cond) RGL_ASSERT(cond, strerror(errno))
+
+void BufferAlloc(RGL_Buffer *buf) {
+  unsigned int size = buf->width * buf->height * 4;
+
+  buf->data = mmap(NULL, size, PROT_READ | PROT_WRITE,
+                   MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);
+  assertErrno(buf->data != MAP_FAILED);
+}
+
+void BufferDestroy(RGL_Buffer *buf) {
+  unsigned int size = buf->width * buf->height * 4;
+  if (munmap(buf->data, size) < 0) {
+    crashErrno();
+  }
+}
+
+void ArenaInit(RGL_Arena *arena, unsigned int capacity) {
+  if (capacity) {
+    arena->capacity = capacity;
+  } else {
+    arena->capacity = 4096;
+  }
+
+  arena->data = mmap(0, arena->capacity, PROT_READ | PROT_WRITE,
+                     MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);
+  if (arena->data == MAP_FAILED) {
+    crashErrno();
+  }
+
+  arena->size = 0;
+}
+
+void ArenaDestroy(RGL_Arena *arena) {
+  if (munmap(arena->data, arena->capacity) < 0) {
+    crashErrno();
+  }
+}
+
+int WritePPM(RGL_Buffer buf, const char *filename) {
+  int i;
+  FILE *f = fopen(filename, "wb");
+  RGL_ASSERT(f, "failed to open file");
+
+  fprintf(f, "P6\n%d %d\n255\n", buf.width, buf.height);
+
+  for (i = 0; i < buf.width * buf.height; ++i) {
+    unsigned int pixel = buf.data[i];
+
+    unsigned char r = (pixel >> 16) & 0xFF;
+    unsigned char g = (pixel >> 8) & 0xFF;
+    unsigned char b = pixel & 0xFF;
+
+    fputc(r, f);
+    fputc(g, f);
+    fputc(b, f);
+  }
+
+  fclose(f);
+  return 0;
+}