Draw floors and ceilings

Signed-off-by: Hans Kokx <hans.d.kokx@gmail.com>

raycaster.c

@@ -397,13 +397,58 @@ void drawRays3D()
   }
 }
 
+// * Draw ceiling
+void drawCeiling()
+{
+  float halfHeight = (float)(gameHeight / 2);
+
+  glBegin(GL_QUADS);
+  for (float distance = 0; distance < halfHeight; distance += 1.0f)
+  {
+    // Normalize color from 0.0 to 1.0 based on distance, multiplied by relative intensity
+    float colorIntensity = 0.5f + (distance / halfHeight);
+    glColor3f(0.25 * colorIntensity, 0.25 * colorIntensity, 0.25 * colorIntensity);
+
+    // Draw a horizontal strip at the current distance
+    glVertex2f(MAP_WIDTH + GAP, distance);
+    glVertex2f(MAP_WIDTH + GAP, distance + 1.0f);
+    glVertex2f(TOTAL_WIDTH, distance + 1.0f);
+    glVertex2f(TOTAL_WIDTH, distance);
+  }
+  glEnd();
+}
+
+// * Draw floor
+void drawFloor()
+{
+  float halfHeight = (float)(gameHeight / 2);
+
+  glBegin(GL_QUADS);
+  for (float distance = 0; distance < halfHeight; distance += 1.0f)
+  {
+
+    float colorIntensity = 0.5f + (distance / halfHeight);
+    glColor3f(0.25 * colorIntensity, 0.25 * colorIntensity, 0.0f);
+
+    float y = halfHeight + distance;
+    glVertex2f(MAP_WIDTH + GAP, y);
+    glVertex2f(MAP_WIDTH + GAP, y + 1.0f);
+    glVertex2f(TOTAL_WIDTH, y + 1.0f);
+    glVertex2f(TOTAL_WIDTH, y);
+  }
+  glEnd();
+}
+
 // * Main rendering
 void display()
 {
   glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+  drawCeiling();
+  drawFloor();
   drawMap2D();
   drawRays3D();
   drawPlayer();
+
   glutSwapBuffers();
 }