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-rw-r--r--src/libs/din/din.c2
-rw-r--r--src/libs/din/din.h2
2 files changed, 2 insertions, 2 deletions
diff --git a/src/libs/din/din.c b/src/libs/din/din.c
index aa71a2f..1cb0b97 100644
--- a/src/libs/din/din.c
+++ b/src/libs/din/din.c
@@ -94,7 +94,7 @@ static inline float smootherstep(float x) {
/* coordinate is in a unit cube of -1...+1 */
-float din(din_t *din, v3f_t *coordinate)
+float din(const din_t *din, v3f_t *coordinate)
{
int x0, y0, z0, x1, y1, z1;
float i1, i2, ii1, ii2;
diff --git a/src/libs/din/din.h b/src/libs/din/din.h
index 97823b6..ff25fb4 100644
--- a/src/libs/din/din.h
+++ b/src/libs/din/din.h
@@ -7,6 +7,6 @@ typedef struct v3f_t v3f_t;
din_t * din_new(int width, int height, int depth, unsigned seed);
void din_free(din_t *din);
void din_randomize(din_t *din);
-float din(din_t *din, v3f_t *coordinate);
+float din(const din_t *din, v3f_t *coordinate);
#endif
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