Do not output the shader compile log if it is empty.

diff --git a/util.cpp b/util.cpp
index 1c47e11787a8c9781d662334430a2220aef47bf0..9eaa262734f284b53aebba1d1c2672538dcc3aee 100644 (file)
--- a/util.cpp
+++ b/util.cpp
@@ -1,4 +1,5 @@
 #include <stdio.h>
+#include <string.h>
 #include <assert.h>
 
 #include <math.h>
@@ -88,7 +89,9 @@ GLuint compile_shader(const std::string &shader_src, GLenum type)
        GLsizei log_length = sizeof(info_log) - 1;
        glGetShaderInfoLog(obj, log_length, &log_length, info_log);
        info_log[log_length] = 0; 
-       printf("shader compile log: %s\n", info_log);
+       if (strlen(info_log) > 0) {
+               printf("shader compile log: %s\n", info_log);
+       }
 
        GLint status;
        glGetShaderiv(obj, GL_COMPILE_STATUS, &status);