X-Git-Url: https://git.sesse.net/?p=movit;a=blobdiff_plain;f=dither_effect.cpp;h=44933b61cc4363470762daa05882301e1043fed2;hp=1399c8196984c728ac148ea686f4ab9de504e403;hb=37f56fcbe571b2322243f6de59494bf9e0cbb37a;hpb=29072985d0a00a53e5b578a1444cee61a0c9e1f2

diff --git a/dither_effect.cpp b/dither_effect.cpp
index 1399c81..44933b6 100644
--- a/dither_effect.cpp
+++ b/dither_effect.cpp
@@ -1,6 +1,6 @@
-#include <math.h>
-#include <assert.h>
 #include <GL/glew.h>
+#include <assert.h>
+#include <algorithm>
 
 #include "dither_effect.h"
 #include "util.h"
@@ -85,6 +85,10 @@ void DitherEffect::set_gl_state(GLuint glsl_program_num, const std::string &pref
 {
 	Effect::set_gl_state(glsl_program_num, prefix, sampler_num);
 
+	assert(width > 0);
+	assert(height > 0);
+	assert(num_bits > 0);
+
 	if (width != last_width || height != last_height || num_bits != last_num_bits) {
 		update_texture(glsl_program_num, prefix, sampler_num);
 		last_width = width;