diff --git a/programs/city.c b/programs/city.c
index 0366688..b47f21f 100644
--- a/programs/city.c
+++ b/programs/city.c
@@ -114,8 +114,8 @@ void drawPixel(S3L_PixelInfo *p)
 {
   if (p->triangleID != previousTriangle)
   {
-    S3L_Index *uvIndices;
-    S3L_Unit *uvs;
+    const S3L_Index *uvIndices;
+    const S3L_Unit *uvs;
 
     if (p->modelIndex == 0)
     {
@@ -245,7 +245,7 @@ int main()
       if (event.type == SDL_QUIT)
         running = 0;
 
-    uint8_t *state = SDL_GetKeyboardState(NULL);
+    const uint8_t *state = SDL_GetKeyboardState(NULL);
 
     int16_t step = (velocity * frameDiffMs) / 1000;
     int16_t stepFriction = (FRICTION * frameDiffMs) / 1000;
@@ -277,7 +277,6 @@ int main()
     S3L_rotationToDirections(models[1].transform.rotation,S3L_FRACTIONS_PER_UNIT,&carDirection,0,0);
 
     S3L_Vec4 previousCarPos = models[1].transform.translation;
-    S3L_Vec4 previousCamPos = scene.camera.transform.translation;
 
     int16_t friction = 0;
 
diff --git a/programs/hqOffline.c b/programs/hqOffline.c
index d1b3790..7f025d2 100644
--- a/programs/hqOffline.c
+++ b/programs/hqOffline.c
@@ -21,6 +21,7 @@
 
 #include "../small3dlib.h"
 #include <stdio.h>
+#include <string.h>
 #include <math.h>
 
 #include "grassTexture.h"
@@ -84,7 +85,7 @@ S3L_Unit treeNormals[TREE_VERTEX_COUNT * 3];
 S3L_Model3D models[MODELS_TOTAL];
 S3L_Scene scene;
 
-int previousTriangle = -1;
+uint32_t previousTriangle = 1000;
 
 S3L_Vec4 toLightDirection;
 
@@ -92,7 +93,7 @@ S3L_Vec4 n0, n1, n2, v0, v1, v2;
 
 S3L_Vec4 uv0, uv1, uv2;
 
-void sampleTexture(uint8_t *texture, int w, int h, float x, float y, uint8_t color[3])
+void sampleTexture(const uint8_t *texture, int w, int h, float x, float y, uint8_t color[3])
 {
   // we do linear interpolation of the samples
 
@@ -220,7 +221,7 @@ void drawPixel(S3L_PixelInfo *p)
     specularIntensity = 0.8;
     specularPower = 40.0;
 
-    float dist, dx, dy;
+    float dist;
 
     // create wavy normal map for water
 
@@ -453,14 +454,10 @@ int main()
   char fileName[] = "test00.ppm";
 
   S3L_Transform3D transform0, transform1;
-  S3L_Vec4 target0, target1;
 
   S3L_initTransoform3D(&transform0);
   S3L_initTransoform3D(&transform1);
 
-  target0 = scene.models[0].transform.translation;
-  target1 = scene.models[2].transform.translation;
-
   transform0.translation.x = -2 * S3L_FRACTIONS_PER_UNIT;
   transform0.translation.y = 5 * S3L_FRACTIONS_PER_UNIT;
   transform0.translation.z = -14 * S3L_FRACTIONS_PER_UNIT;
diff --git a/programs/level.c b/programs/level.c
index 2bfaea0..21c9383 100644
--- a/programs/level.c
+++ b/programs/level.c
@@ -190,8 +190,6 @@ void draw()
 
   clearScreen();
 
-  uint32_t f = frame;
-
   S3L_drawScene(scene);
 
   S3L_Vec4 screenPoint;
@@ -255,7 +253,7 @@ int main()
  
     S3L_rotationToDirections(scene.camera.transform.rotation,20,&camF,&camR,0);
 
-    uint8_t *state = SDL_GetKeyboardState(NULL);
+    const uint8_t *state = SDL_GetKeyboardState(NULL);
 
     if (state[SDL_SCANCODE_A])
       scene.camera.transform.rotation.y += 1;
diff --git a/small3dlib.h b/small3dlib.h
index 959341d..e38c9a1 100644
--- a/small3dlib.h
+++ b/small3dlib.h
@@ -2130,7 +2130,9 @@ void S3L_drawTriangle(
       int8_t rowCount = S3L_PC_APPROX_LENGTH;
 #endif
 
+#if S3L_Z_BUFFER
       S3L_Index zBufferIndex = p.y * S3L_RESOLUTION_X + lXClipped;
+#endif
 
       // draw the row -- inner loop:
 
@@ -2230,6 +2232,7 @@ void S3L_drawTriangle(
 
 #if S3L_Z_BUFFER
         p.previousZ = S3L_zBuffer[zBufferIndex];
+
         zBufferIndex++;
 
         if (!S3L_zTest(p.x,p.y,p.depth))