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Add gbuffer.h

--- a/field.h

+++ b/field.h

@@ -27,12 +27,3 @@

 } Field_load_error;

 Field_load_error field_load_file(char const* filepath, Field* field);

-

-inline Glyph gbuffer_peek_relative(Gbuffer gbuffer, Usz height, Usz width,

-                                   Usz y, Usz x, Isz delta_y, Isz delta_x) {

-  Isz y0 = (Isz)y + delta_y;

-  Isz x0 = (Isz)x + delta_x;

-  if (y0 < 0 || x0 < 0 || (Usz)y0 >= height || (Usz)x0 >= width)

-    return '.';

-  return gbuffer[(Usz)y0 * width + (Usz)x0];

-}

--- /dev/null

+++ b/gbuffer.h

@@ -1,0 +1,11 @@

+#pragma once

+#include "base.h"

+

+inline Glyph gbuffer_peek_relative(Gbuffer gbuffer, Usz height, Usz width,

+                                   Usz y, Usz x, Isz delta_y, Isz delta_x) {

+  Isz y0 = (Isz)y + delta_y;

+  Isz x0 = (Isz)x + delta_x;

+  if (y0 < 0 || x0 < 0 || (Usz)y0 >= height || (Usz)x0 >= width)

+    return '.';

+  return gbuffer[(Usz)y0 * width + (Usz)x0];

+}

--- a/sim.c

+++ b/sim.c

@@ -1,5 +1,6 @@

 #include "field.h"

 #include "mark.h"

+#include "gbuffer.h"

 #include "sim.h"

 //////// Utilities