Removed stdio and added documentation

libultraship/libultraship/Lib/Fast3D/gfx_pc.cpp

@@ -1397,7 +1397,7 @@ static void gfx_sp_tri1(uint8_t vtx1_idx, uint8_t vtx2_idx, uint8_t vtx3_idx, bo
             buf_vbo[buf_vbo_len++] = rdp.grayscale_color.r / 255.0f;
             buf_vbo[buf_vbo_len++] = rdp.grayscale_color.g / 255.0f;
             buf_vbo[buf_vbo_len++] = rdp.grayscale_color.b / 255.0f;
-            buf_vbo[buf_vbo_len++] = rdp.grayscale_color.a / 255.0f; // Unused
+            buf_vbo[buf_vbo_len++] = rdp.grayscale_color.a / 255.0f; // lerp interpolation factor (not alpha)
         }
 
         for (int j = 0; j < num_inputs; j++) {

soh/src/code/z_play.c

@@ -1,5 +1,3 @@
-#include <stdio.h>
-
 #include "global.h"
 #include "vt.h"