Add texture ceiling

demo2.cpp

@@ -33,6 +33,10 @@
   /* ^ Turns on computation of texture coordinates for the floor in raycastlib
        and makes this demo render the textures. */
 
+//#define TEXTURE_CEILING
+  /* ^ Turns on texture on ceiling (RCL_COMPUTE_FLOOR_TEXCOORDS must be turned
+       on as well for this to work). */
+
 #define FLOOR_TEXTURE_SCALE 2
   /* ^ Scales the floor texture if RCL_COMPUTE_FLOOR_TEXCOORDS is on. */
 
@@ -83,6 +87,8 @@ Player player;
 #define INFO_BAR_START 70
 #define TEXTURE_MAX_DISTANCE (RCL_UNITS_PER_SQUARE * 6)
 
+#define RESOLUTION_Y (INFO_BAR_START + 1)
+
 // temporary defines for better visibility of walls and floors below
 #define D 6
 #define o 0
@@ -897,39 +903,55 @@ inline void pixelFunc(RCL_PixelInfo *pixel)
   if (pixel->position.y == MIDDLE_ROW)
     zBuffer[pixel->position.x] = pixel->depth;
 
-  uint8_t c = 0;
+  uint8_t color = 0;
 
 #ifndef NO_MIRROR
   if (pixel->position.y == 0)
     mirror = 0;
 #endif
   
+bool drawCeiling = false;
+
+int16_t intensity = 0;
+
   if (!pixel->isWall)
   {
 #if RCL_COMPUTE_FLOOR_TEXCOORDS == 1
     if (pixel->isFloor)
     {
       if (pixel->texCoords.y > 3 * RCL_UNITS_PER_SQUARE) // leave astrip of untextured floor
-        c = pixel->depth > RCL_UNITS_PER_SQUARE * 5 ?
+        color = pixel->depth > RCL_UNITS_PER_SQUARE * 5 ?
             textureAverageColors[1] : 
             sampleImage(textures[1],pixel->texCoords.x / FLOOR_TEXTURE_SCALE,pixel->texCoords.y / FLOOR_TEXTURE_SCALE);
       else
-        c = cFloor;
+        color = cFloor;
+
+  #ifdef TEXTURE_CEILING
+      drawCeiling = true;
+  #endif
     }
     else
-      c = 0; // looks better :)
+    {
+  #ifdef TEXTURE_CEILING
+      // don't draw ceiling here, we'll draw it along with floor
+      return;
+  #else
+      color = 0; // looks better :)
+  #endif
+    }
+
 #else
-    c = pixel->isFloor ? cFloor: cCeiling;
+    color = pixel->isFloor ? cFloor: cCeiling;
 #endif
 
 #ifndef NO_MIRROR
-    int16_t intensity =  pixel->isFloor ?
+    intensity =  pixel->isFloor ?
       -1 * (pixel->depth - mirror * 64) / RCL_UNITS_PER_SQUARE : 0;
 #else
-    int16_t intensity = -1 * pixel->depth / (RCL_UNITS_PER_SQUARE * 2);
+    intensity = -1 * pixel->depth / (RCL_UNITS_PER_SQUARE * 2);
 #endif
 
-    c = addIntensity(c,intensity);
+    color = addIntensity(color,intensity);
 
     mirror++;
   }
@@ -938,9 +960,9 @@ inline void pixelFunc(RCL_PixelInfo *pixel)
     RCL_Unit textureScroll = pixel->hit.type != 4 ? 0 : 16 * pokitto.frameCount;
 
 #ifdef NO_TEXTURES
-    c = textureAverageColors[pixel->hit.type];
+    color = textureAverageColors[pixel->hit.type];
 #else
-    c = pixel->depth < TEXTURE_MAX_DISTANCE ?
+    color = pixel->depth < TEXTURE_MAX_DISTANCE ?
       sampleImage(textures[pixel->hit.type],pixel->texCoords.x + textureScroll,pixel->texCoords.y) :
       textureAverageColors[pixel->hit.type];
 #endif
@@ -948,20 +970,36 @@ inline void pixelFunc(RCL_PixelInfo *pixel)
 #ifndef NO_SHADING
     if (previousColumn == pixel->position.x)
     {
-      c = addIntensity(c,pixelIntensity);
+      color = addIntensity(color,pixelIntensity);
     }
     else
     {
       // optimization: precompute intensity for the whole column
       pixelIntensity = 1 - pixel->depth / (RCL_UNITS_PER_SQUARE * 2) + (pixel->hit.direction % 2 == 0 ? 2 : 0);
       previousColumn = pixel->position.x;
-      c = addIntensity(c,pixelIntensity);
+      color = addIntensity(color,pixelIntensity);
     }
 #endif
 
   }
 
-  putSubsampledPixel(pixel,c);
+  putSubsampledPixel(pixel->position.x,pixel->position.y,color);
+
+#ifdef TEXTURE_CEILING
+  if (drawCeiling)
+  {
+    /* here we sample a different texture for ceiling, but if the texture is
+       same as floor, just reuse the color sampled above to save on the
+       sampling and intensity addition */
+
+    color = pixel->depth > RCL_UNITS_PER_SQUARE * 5 ?
+            textureAverageColors[0] : 
+            sampleImage(textures[0],pixel->texCoords.x / FLOOR_TEXTURE_SCALE,pixel->texCoords.y / FLOOR_TEXTURE_SCALE);
+    color = addIntensity(color,intensity);
+    putSubsampledPixel(pixel->position.x,RESOLUTION_Y - pixel->position.y - 1,color);
+  }
+#endif
+
 }
 
 void draw()
@@ -1008,7 +1046,7 @@ int main()
   player.setPositionSquare(6,5);
   player.mCamera.height = RCL_CAMERA_COLL_HEIGHT_BELOW;
 
-  player.mCamera.resolution.y = INFO_BAR_START + 2;
+  player.mCamera.resolution.y = RESOLUTION_Y;
 
   uint32_t previousTime = 0;
   uint32_t dt;

general.hpp

@@ -77,19 +77,19 @@ RCL_RayConstraints defaultConstraints;
 unsigned short palette[256];
 
 #ifdef POK_SIM
-inline void putSubsampledPixel(RCL_PixelInfo *pixel, uint8_t color)
+inline void putSubsampledPixel(int32_t x, int32_t y, uint8_t color)
 {
-  pokitto.display.drawPixel(pixel->position.x * SUBSAMPLE,pixel->position.y,color);
+  pokitto.display.drawPixel(x * SUBSAMPLE,y,color);
-  pokitto.display.drawPixel(pixel->position.x * SUBSAMPLE + 1,pixel->position.y,color);
+  pokitto.display.drawPixel(x * SUBSAMPLE + 1,y,color);
 }
 #else
 // This code breaks the simulator.
-inline void putSubsampledPixel(RCL_PixelInfo *pixel, uint8_t color)
+inline void putSubsampledPixel(int32_t x, int32_t y, uint8_t color)
 {
   uint8_t *buf = pokitto.display.screenbuffer;
 
-  buf += pixel->position.x * SUBSAMPLE;
+  buf += x * SUBSAMPLE;
-  buf += pixel->position.y * SCREEN_WIDTH;
+  buf += y * SCREEN_WIDTH;
 
   for (uint8_t i = 0; i < SUBSAMPLE - 1; ++i)
     *buf++ = color;