Add gl_drawline to util.c

src/include/util.h

@@ -1,12 +1,18 @@
 #ifndef UTIL_H_
 #define UTIL_H_
 
+#include <stdint.h>
 #include "sdk.h"
 #include "globals.h"
 
 /* Vector 2 for 2d points */
 typedef float vec2_t[2];
 
+/* RGB color */
+typedef struct {
+    uint8_t r, g, b;
+} rgb_t;
+
 /*----------------------------------------------------------------------------*/
 
 bool is_alive(cl_entity_t* ent);
@@ -15,5 +21,6 @@ char* get_name(int ent_idx);
 vec3_t vec3(float x, float y, float z);
 bool vec_is_zero(vec3_t v);
 bool world_to_screen(vec3_t vec, vec2_t screen);
+void gl_drawline(int x0, int y0, int x1, int y1, float w, rgb_t col);
 
 #endif /* UTIL_H_ */