Start LOD

assets.h

@@ -26,11 +26,11 @@ static const uint8_t map1[] =
     10,
     0,
     
-    LCR_MAP_BLOCK(LCR_BLOCK_FULL_ACCEL,32,32,32,LCR_BLOCK_MATERIAL_CONCRETE,0),
+    LCR_MAP_BLOCK(LCR_BLOCK_FULL_ACCEL,32,2,32,LCR_BLOCK_MATERIAL_CONCRETE,0),
-    LCR_MAP_BLOCK(LCR_BLOCK_CUBOID_HOLLOW,3,4,4,0,0),
+    LCR_MAP_BLOCK(LCR_BLOCK_CUBOID_HOLLOW,1,40,1,0,0),
 
-    LCR_MAP_BLOCK(LCR_BLOCK_FULL_ACCEL,40,34,33,LCR_BLOCK_MATERIAL_CONCRETE,0),
+    LCR_MAP_BLOCK(LCR_BLOCK_FULL_ACCEL,32,32,32,LCR_BLOCK_MATERIAL_CONCRETE,0),
-    LCR_MAP_BLOCK(LCR_BLOCK_CUBOID_HOLLOW,4,3,2,0,0),
+    LCR_MAP_BLOCK(LCR_BLOCK_CUBOID_HOLLOW,4,4,4,0,0),
 
     LCR_MAP_BLOCK(LCR_BLOCK_FULL,50,20,20,LCR_BLOCK_MATERIAL_GRASS,0),
     LCR_MAP_BLOCK(LCR_BLOCK_CUBOID_HOLLOW,5,5,5,0,0),
@@ -41,6 +41,12 @@ static const uint8_t map1[] =
     LCR_MAP_BLOCK(LCR_BLOCK_FULL,2,25,50,LCR_BLOCK_MATERIAL_GRASS,0),
     LCR_MAP_BLOCK(LCR_BLOCK_CUBOID_HOLLOW,3,3,3,0,0),
 
+    LCR_MAP_BLOCK(LCR_BLOCK_FULL,0,0,0,LCR_BLOCK_MATERIAL_GRASS,0),
+    LCR_MAP_BLOCK(LCR_BLOCK_CUBOID_HOLLOW,40,1,1,0,0),
+
+    LCR_MAP_BLOCK(LCR_BLOCK_FULL,63,63,0,LCR_BLOCK_MATERIAL_GRASS,0),
+    LCR_MAP_BLOCK(LCR_BLOCK_CUBOID_HOLLOW,1,1,40,0,0),
+
 /*
     LCR_MAP_BLOCK(LCR_BLOCK_FULL,0,15,0,LCR_BLOCK_MATERIAL_GRASS,0),
     LCR_MAP_BLOCK(LCR_BLOCK_CUBOID_HOLLOW,7,4,8,0,0),

renderer.h

@@ -17,9 +17,10 @@
 #include "small3dlib.h"
 
 /// Renderer specific unit, length of one map square.
-#define LCR_RENDERER_UNIT S3L_FRACTIONS_PER_UNIT
+#define LCR_RENDERER_UNIT (S3L_FRACTIONS_PER_UNIT / 2)
+        // ^ just S3L_FRACTIONS_PER_UNIT leaves some tris bugging
 
-#define LCR_RENDERER_CHUNK_RESOLUTION 4
+#define LCR_RENDERER_CHUNK_RESOLUTION 4 // do not change
 
 #define LCR_RENDERER_CHUNK_SIZE_HORIZONTAL \
   ((LCR_MAP_SIZE_BLOCKS * LCR_RENDERER_UNIT) / LCR_RENDERER_CHUNK_RESOLUTION)
@@ -27,6 +28,8 @@
 #define LCR_RENDERER_CHUNKS_TOTAL (LCR_RENDERER_CHUNK_RESOLUTION * \
   LCR_RENDERER_CHUNK_RESOLUTION * LCR_RENDERER_CHUNK_RESOLUTION)
 
+#define LCR_RENDERER_LOD_BLOCKS 64
+
 struct
 {
   S3L_Scene scene;
@@ -42,7 +45,6 @@ struct
   S3L_Unit mapVerts[LCR_SETTING_MAX_MAP_VERTICES * 3];
   S3L_Index mapTris[LCR_SETTING_MAX_MAP_TRIANGLES * 3];
 
-
   S3L_Index chunkStarts[LCR_RENDERER_CHUNKS_TOTAL];
 
   /**
@@ -52,6 +54,10 @@ struct
   */
   uint8_t mapTriangleData[LCR_SETTING_MAX_MAP_TRIANGLES];
 
+
+uint8_t gridLOD[LCR_RENDERER_LOD_BLOCKS];
+
+
   // pixel function precomputed values:
   int previousTriID;
   int triUVs[6];
@@ -660,6 +666,27 @@ uint8_t _LCR_buildMapModel(void)
   return 1;
 }
 
+void _LCR_computeLOD(void)
+{
+  LCR_log("computing LOD");
+
+  for (int i = 0; i < LCR_RENDERER_LOD_BLOCKS; ++i)
+    LCR_renderer.gridLOD[i] = 0;
+
+  for (int i = 0; i < LCR_currentMap.blockCount; ++i)
+  {
+    uint8_t x, y, z;
+
+    LCR_mapBlockGetCoords(LCR_currentMap.blocks + i * LCR_BLOCK_SIZE,&x,&y,&z);
+
+    x /= 8;
+    y /= 8;
+    z /= 8;
+
+    LCR_renderer.gridLOD[z * 8 + y] |= (0x01 << x);
+  }
+}
+
 uint8_t LCR_rendererInit(void)
 {
   LCR_log("initializing renderer");
@@ -671,6 +698,8 @@ uint8_t LCR_rendererInit(void)
 
   _LCR_makeMapChunks();
 
+  _LCR_computeLOD();
+
   S3L_sceneInit(
     LCR_renderer.models + 1,8,&LCR_renderer.scene);
 
@@ -722,6 +751,80 @@ chk(>,z,LCR_MAP_SIZE_BLOCKS * LCR_RENDERER_UNIT / 2)
 
 }
 
+/**
+  Fast and safe rect drawing function (handles out of screen coords).
+*/
+void LCR_rendererDrawRect(int x, int y, unsigned int w, unsigned int h,
+  uint16_t color)
+{
+  if (x >= LCR_EFFECTIVE_RESOLUTION_X || y >= LCR_EFFECTIVE_RESOLUTION_Y)
+    return;
+
+  if (x < 0)
+  {
+    if (-1 * x > ((int) w))
+      return;
+
+    w += x;
+    x = 0;
+  }
+
+  if (x + w > LCR_EFFECTIVE_RESOLUTION_X)
+    w = LCR_EFFECTIVE_RESOLUTION_X - x;
+
+  if (y < 0)
+  {
+    if (-1 * y > ((int) h))
+      return;
+
+    y += h;
+    y = 0;
+  }
+
+  if (y + h > LCR_EFFECTIVE_RESOLUTION_X)
+    h = LCR_EFFECTIVE_RESOLUTION_Y - y;
+
+  unsigned long index = y * LCR_EFFECTIVE_RESOLUTION_X + x;
+
+  for (unsigned int i = 0; i < h; ++i)
+  {
+    for (unsigned int j = 0; j < w; ++j)
+    {
+      LCR_drawPixel(index,color);
+      index++;
+    }
+    
+    index += LCR_EFFECTIVE_RESOLUTION_X - w;
+  }
+}
+
+void _LCR_drawLOD(int blockX, int blockY, int blockZ, unsigned int size,
+  uint16_t color)
+{
+  S3L_Vec4 p, r;
+
+  p.x = (blockX - LCR_MAP_SIZE_BLOCKS / 2) * LCR_RENDERER_UNIT
+    + LCR_RENDERER_UNIT / 2;
+
+  p.y = (blockY - LCR_MAP_SIZE_BLOCKS / 2) * (LCR_RENDERER_UNIT / 2)
+    + LCR_RENDERER_UNIT / 4;
+
+  p.z = (blockZ - LCR_MAP_SIZE_BLOCKS / 2) * LCR_RENDERER_UNIT
+    + LCR_RENDERER_UNIT / 2;
+
+  p.w = size;
+
+  S3L_project3DPointToScreen(p,LCR_renderer.scene.camera,&r);
+
+  if (r.w > 0 && r.z > LCR_SETTING_LOD_DISTANCE * LCR_RENDERER_UNIT &&
+    r.w < LCR_EFFECTIVE_RESOLUTION_X)
+  {
+    LCR_rendererDrawRect(r.x - r.w / 2,r.y - r.w / 2,
+    r.w,r.w,color);
+  }
+}
+
+
 /**
   Draws background sky, offsets are in multiples of screen dimensions
   (e.g. S3L_FRACTIONS_PER_UNIT / 2 for offsetH means half the screen width).
@@ -887,29 +990,31 @@ void _LCR_loadMapChunks(void)
 {
   int8_t camChunk[3], chunkOffsets[3];
   S3L_Vec4 cp = LCR_renderer.scene.camera.transform.translation;
+  S3L_Vec4 cf;
+  
+  S3L_rotationToDirections(LCR_renderer.scene.camera.transform.rotation,
+    LCR_RENDERER_CHUNK_SIZE_HORIZONTAL / 2,&cf,0,0);
 
-  camChunk[0] = (cp.x + (LCR_MAP_SIZE_BLOCKS * LCR_RENDERER_UNIT) / 2)
+  cp.x += (LCR_MAP_SIZE_BLOCKS * LCR_RENDERER_UNIT) / 2;
-    / LCR_RENDERER_CHUNK_SIZE_HORIZONTAL;
+  cp.y += (LCR_MAP_SIZE_BLOCKS * LCR_RENDERER_UNIT) / 4;
+  cp.z += (LCR_MAP_SIZE_BLOCKS * LCR_RENDERER_UNIT) / 2;
 
-  camChunk[1] = (cp.y + (LCR_MAP_SIZE_BLOCKS * LCR_RENDERER_UNIT) / 4)
+  cf.x += cp.x % LCR_RENDERER_CHUNK_SIZE_HORIZONTAL;
-    / (LCR_RENDERER_CHUNK_SIZE_HORIZONTAL / 2);
+  cf.y += cp.y % (LCR_RENDERER_CHUNK_SIZE_HORIZONTAL / 2);
+  cf.z += cp.z % LCR_RENDERER_CHUNK_SIZE_HORIZONTAL;
 
-  camChunk[2] = ((cp.z + (LCR_MAP_SIZE_BLOCKS * LCR_RENDERER_UNIT) / 2)
+  camChunk[0] = cp.x / LCR_RENDERER_CHUNK_SIZE_HORIZONTAL;
-    / LCR_RENDERER_CHUNK_SIZE_HORIZONTAL);
+  camChunk[1] = cp.y / (LCR_RENDERER_CHUNK_SIZE_HORIZONTAL / 2);
+  camChunk[2] = cp.z / LCR_RENDERER_CHUNK_SIZE_HORIZONTAL;
 
-  uint8_t camRot = S3L_wrap(LCR_renderer.scene.camera.transform.rotation.y
+  chunkOffsets[0] =
-    + S3L_FRACTIONS_PER_UNIT / 8,S3L_FRACTIONS_PER_UNIT) /
+    (cf.x >= (LCR_RENDERER_CHUNK_SIZE_HORIZONTAL / 2)) ? 1 : -1;
-    (S3L_FRACTIONS_PER_UNIT / 4);
-
-  uint8_t camSide = (((camRot % 2) ? cp.x : cp.z) %
-    LCR_RENDERER_CHUNK_SIZE_HORIZONTAL) >=
-    LCR_RENDERER_CHUNK_SIZE_HORIZONTAL / 2;
-
-  chunkOffsets[(camRot % 2) ? 0 : 2] = (camRot == 1 || camRot == 2) ? -1 : 1;
-  chunkOffsets[(camRot % 2) ? 2 : 0] = (camSide == (camRot < 2)) ? 1 : -1;
 
   chunkOffsets[1] =
-    LCR_renderer.scene.camera.transform.rotation.x <= 0 ? -1 : 1;
+    (cf.y >= (LCR_RENDERER_CHUNK_SIZE_HORIZONTAL / 4)) ? 1 : -1;
+
+  chunkOffsets[2] =
+    (cf.z >= (LCR_RENDERER_CHUNK_SIZE_HORIZONTAL / 2)) ? 1 : -1;
 
   for (uint8_t i = 0; i < 8; ++i)
     _LCR_loadMapChunk(i,
@@ -918,6 +1023,30 @@ void _LCR_loadMapChunks(void)
       camChunk[2] + ((i & 0x04) ? chunkOffsets[2] : 0));
 }
 
+void LCR_rendererDrawLOD(void)
+{
+  for (unsigned int i = 0; i < LCR_RENDERER_LOD_BLOCKS; ++i)
+    if (LCR_renderer.gridLOD[i])
+    {
+      uint8_t byte = LCR_renderer.gridLOD[i];
+      unsigned int bx, by, bz;
+
+      bz = (i / 8) * 8 + 4;
+      by = (i % 8) * 8 + 4;
+
+      for (unsigned int j = 0; j < 8; ++j)
+      {
+        if (byte & 0x01)
+        {
+          bx = j * 8 + 4;
+          _LCR_drawLOD(bx,by,bz,LCR_EFFECTIVE_RESOLUTION_X,0);
+        }                       // TODO: this ^
+
+        byte >>= 1;
+      }
+    }
+}
+
 void LCR_rendererDraw(void)
 {
   LCR_renderer.previousTriID = -1;
@@ -929,6 +1058,8 @@ void LCR_rendererDraw(void)
     LCR_renderer.scene.camera.transform.rotation.y,
     -4 * LCR_renderer.scene.camera.transform.rotation.x);
 
+  LCR_rendererDrawLOD();
+
   S3L_drawScene(LCR_renderer.scene);
 }
 

settings.h

@@ -70,4 +70,11 @@
   #define LCR_SETTING_TEXTURE_SUBSAMPLE 4
 #endif
 
+#ifndef LCR_SETTING_LOD_DISTANCE
+  /** Distance in game squares from which LOD will be drawn. Value 64 or higher
+    turns off LOD completely. Note that this doesn't affect rendering distance
+    of 3D models. */
+  #define LCR_SETTING_LOD_DISTANCE 25
+#endif
+
 #endif // guard