Add particles

TODO.txt

@@ -1,7 +1,5 @@
 =========== GENERAL ==============
 
-- add simple particle effects for grass/dirt/drift? Can be just a few squares
-  animated from the projected backwheels.
 - fix the ramp map again due to new physics
 - keyboard ghosting is an issue, particularly when initiating drift with brake
   (arrow keys must be used with S for braking for left drift to work) -- think
@@ -78,6 +76,8 @@
 =========== HANDLED ==============
 
 - MAP4: one triangle in top section is missing!
+- add simple particle effects for grass/dirt/drift? Can be just a few squares
+  animated from the projected backwheels.
 - FPS logging for optim
 - the pinch collision test seems to sometimes stop the car e.g. after falling
   from bigger height or when running into ramp at high speed (or not?) - FIX

data

@@ -133,3 +133,5 @@ details
 :+018 :f213 :!v05 :f311
 #RLC1;00LC1;8bd6e314 0000475:0011:0199:0041:00a9:0051:0029:0091:0049:0041:0049:0041:0249:0091:0015:0031:0019:01a1:0049:0041:0119:0031:0069:0041:0049:0041:0059:0031:00d9:0031:00f9:0021:0155:0041:01d3:0061:0113:00f1:0043:00c1:0083:0051:0203:0021:0513:0031
 #RLC1;00LC1;8bd6e314 0000455:0011:0169:0041:00a9:0031:0049:00a1:0059:0051:0059:0031:01e9:0071:0045:0039:00e1:0019:00d1:0079:0041:0049:0021:0049:0031:0039:0031:0069:0071:0029:0041:00c3:0041:00e9:0021:0145:0041:0253:01b1:00b3:0051:00a9:0071:0073:0031:00a3:0021:03b3:0031:00a9:0021:0073:0021
+#RLCtiny5;00LCtiny5;5c14d8b6 0000306:00a1:0083:0041:0019:0051:0049:0041:0029:00a1:00c9:0051:0073:00e1:0019:00e1:0013:0211:0049:0051:0033:0051:0039:00c1:0023:00f1:0049:0041:0033:0071:0013:0041:0053:0061:0093:0041:0043:0041:0175:0041:00a3:0041:00b9:0021
+#BLCtiny5;

game.h

@@ -1621,6 +1621,20 @@ uint8_t LCR_gameStep(uint32_t time)
 
     uint32_t events = paused ? 0 : LCR_racingStep(input);
 
+#if LCR_SETTING_PARTICLES
+    LCR_rendererSetParticles(0);
+
+    if (LCR_racingGetCarSpeedUnsigned() > 60)
+    {
+      if (LCR_racingCurrentGroundMaterial() == LCR_BLOCK_MATERIAL_GRASS)
+        LCR_rendererSetParticles(0x538a);
+      else if (LCR_racingCurrentGroundMaterial() == LCR_BLOCK_MATERIAL_DIRT)
+        LCR_rendererSetParticles(0x8c2b);
+      else if (LCR_racingCarIsDrifting())
+        LCR_rendererSetParticles(0x4208);
+    }
+#endif
+
 #ifdef LCR_FPS_GET_MS
     LCR_game.physicsFrameMS += LCR_FPS_GET_MS - frameTime;
     LCR_game.physicsFramesMeasured++;

racing.h

@@ -127,6 +127,8 @@ struct
   LCR_GameUnit carSpeeds[2]; /**< Signed speed in game units per tick (negative
                                   if backwards) and its previous value. */
 
+  uint8_t groundMaterial;    ///< Material currently under car wheels.
+
   uint16_t crashState;
 
   uint8_t playingReplay;
@@ -154,6 +156,16 @@ TPE_Vec3 _LCR_TPE_vec3DividePlain(TPE_Vec3 v, TPE_Unit d)
   return v;
 }
 
+static inline int LCR_racingCarIsDrifting(void)
+{
+  return LCR_racing.carDrifting;
+}
+
+static inline uint8_t LCR_racingCurrentGroundMaterial(void)
+{
+  return LCR_racing.groundMaterial;
+}
+
 /**
   Initializes replay for recording.
 */
@@ -1139,11 +1151,12 @@ uint32_t LCR_racingStep(unsigned int input)
 
   uint32_t result = 0;
   TPE_Vec3 carForw, carRight, carUp, carVel;
-  uint8_t groundMat = LCR_BLOCK_MATERIAL_CONCRETE; // material under wheels
   uint8_t onAccel = 0; // standing on accelerator?
   int groundBlockIndex = -1;
   TPE_Unit driftFriction = 0; // average wheel friction (absolute value)
   
+  LCR_racing.groundMaterial = LCR_BLOCK_MATERIAL_CONCRETE;
+
   if (LCR_racing.playingReplay)
   {
     if (LCR_racing.tick == 0)
@@ -1233,13 +1246,13 @@ uint32_t LCR_racingStep(unsigned int input)
         result |= LCR_RACING_EVENT_FAN;
       }
 
-      groundMat = LCR_mapBlockGetMaterial(
+      LCR_racing.groundMaterial = LCR_mapBlockGetMaterial(
         LCR_currentMap.blocks + groundBlockIndex * LCR_BLOCK_SIZE);
     }
   }
 
   LCR_racing.carBody.friction =
-    _LCR_applyMaterialFactor(LCR_CAR_FORWARD_FRICTION,groundMat);
+    _LCR_applyMaterialFactor(LCR_CAR_FORWARD_FRICTION,LCR_racing.groundMaterial);
 
   if (onAccel)
   {
@@ -1309,13 +1322,15 @@ uint32_t LCR_racingStep(unsigned int input)
     {
       if (input & LCR_RACING_INPUT_FORW)
       { 
-        _LCR_racingWheelAccelerate(0,carForw,groundMat,onAccel);
-        _LCR_racingWheelAccelerate(1,carForw,groundMat,onAccel);
+        _LCR_racingWheelAccelerate(0,carForw,LCR_racing.groundMaterial,onAccel);
+        _LCR_racingWheelAccelerate(1,carForw,LCR_racing.groundMaterial,onAccel);
       }
       else if (input & LCR_RACING_INPUT_BACK)
       {
-        _LCR_racingWheelAccelerate(0,TPE_vec3TimesPlain(carForw,-1),groundMat,onAccel);
-        _LCR_racingWheelAccelerate(1,TPE_vec3TimesPlain(carForw,-1),groundMat,onAccel);
+        _LCR_racingWheelAccelerate(0,TPE_vec3TimesPlain(carForw,-1),
+          LCR_racing.groundMaterial,onAccel);
+        _LCR_racingWheelAccelerate(1,TPE_vec3TimesPlain(carForw,-1),
+          LCR_racing.groundMaterial,onAccel);
       }
     }
 
@@ -1347,7 +1362,7 @@ uint32_t LCR_racingStep(unsigned int input)
           _LCR_applyMaterialFactor(
             LCR_racing.carDrifting ?
               (LCR_CAR_STEER_FRICTION * LCR_CAR_DRIFT_FACTOR) / 8 :
-              LCR_CAR_STEER_FRICTION,groundMat)) / TPE_F);
+              LCR_CAR_STEER_FRICTION,LCR_racing.groundMaterial)) / TPE_F);
 
         driftFriction += TPE_vec3Len(fric);
 

renderer.h

@@ -112,50 +112,23 @@ struct
   unsigned int flatAndTransparent; /**< If non-zero, transparent (dithered)
                                         polygons will be drawn without texture,
                                         with color stored in this variable. */
+#if LCR_SETTING_PARTICLES
+  uint16_t particleColor;          /**< 0x0000 means no particles active. */
+#endif
 } LCR_renderer;
 
-
-void aaa(void)
+/**
+  Sets particle effects drawn around wheels. The parameter says particle color,
+  0x0000 turns particles off.
+*/
+void LCR_rendererSetParticles(uint16_t color)
 {
-  printf("BAD TRIS (%d):\n",LCR_renderer.mapModel.triangleCount);
-
-  for (int i = 0; i < LCR_renderer.mapModel.triangleCount; ++i)
-  { 
-    TPE_Unit sss =
-    TPE_max(
-      TPE_abs(LCR_renderer.mapModel.vertices[
-        LCR_renderer.mapModel.triangles[i * 3] * 3] -
-          LCR_renderer.mapModel.vertices[
-            LCR_renderer.mapModel.triangles[i * 3 + 1] * 3]),
-      TPE_abs(LCR_renderer.mapModel.vertices[
-        LCR_renderer.mapModel.triangles[i * 3 + 1] * 3] -
-          LCR_renderer.mapModel.vertices[
-            LCR_renderer.mapModel.triangles[i * 3 + 2] * 3])
-    );
-
-    if (sss > LCR_RENDERER_UNIT * 2)
-      printf("  - %d (%d %d %d, %d %d %d, %d %d %d) %d %d %d\n",i,
-        LCR_renderer.mapModel.vertices[LCR_renderer.mapModel.triangles[3 * i]],
-        LCR_renderer.mapModel.vertices[LCR_renderer.mapModel.triangles[3 * i] + 1],
-        LCR_renderer.mapModel.vertices[LCR_renderer.mapModel.triangles[3 * i] + 2],
-        LCR_renderer.mapModel.vertices[LCR_renderer.mapModel.triangles[3 * i + 1]],
-        LCR_renderer.mapModel.vertices[LCR_renderer.mapModel.triangles[3 * i + 1] + 1],
-        LCR_renderer.mapModel.vertices[LCR_renderer.mapModel.triangles[3 * i + 1] + 2],
-        LCR_renderer.mapModel.vertices[LCR_renderer.mapModel.triangles[3 * i + 2]],
-        LCR_renderer.mapModel.vertices[LCR_renderer.mapModel.triangles[3 * i + 2] + 1],
-        LCR_renderer.mapModel.vertices[LCR_renderer.mapModel.triangles[3 * i + 2] + 2],
-
-LCR_renderer.mapModel.triangles[3 * i],
-LCR_renderer.mapModel.triangles[3 * i + 1],
-LCR_renderer.mapModel.triangles[3 * i + 2]
-
-
-      );
+#if LCR_SETTING_PARTICLES
+  LCR_renderer.particleColor = color;
+#else
+  return;
+#endif
 }
-}
-
-
-
 
 void _LCR_rendererSetModelTransform(S3L_Model3D *model,
   LCR_GameUnit position[3], LCR_GameUnit rotation[3])
@@ -2100,6 +2073,51 @@ void LCR_rendererDraw3D(void)
 
   LCR_renderer.frame++;
 
+#if LCR_SETTING_PARTICLES  
+  if (LCR_renderer.particleColor)
+  {
+    S3L_Vec4 p, r, s;
+
+    S3L_rotationToDirections(LCR_renderer.carModel->transform.rotation,
+      LCR_RENDERER_UNIT / 2,&p,&r,0);
+
+#define LCR_PARTICLE_SIZE (16 << (LCR_EFFECTIVE_RESOLUTION_X / 640))
+
+    p.w = LCR_PARTICLE_SIZE;
+
+    r.x /= 2;
+    r.y /= 2;
+    r.z /= 2;
+      
+    S3L_vec3Add(&p,LCR_renderer.carModel->transform.translation);
+
+    for (int i = 0; i < 2; ++i) // for both wheels
+    {
+      S3L_vec3Add(&p,r);
+
+      S3L_project3DPointToScreen(p,LCR_renderer.scene.camera,&s);
+
+      if (s.w > 0)
+        for (int j = 0; j < 4; ++j) // 4 particles
+        {
+          int pSize =
+            ((LCR_renderer.frame + 4 * j) << 2) % (2 * LCR_PARTICLE_SIZE);
+
+          LCR_rendererDrawRect(
+            s.x - pSize / 2 + ((j % 2) ? -1 * pSize : pSize),
+            s.y - pSize / 2 + ((j / 2) ? -1 * pSize : pSize),
+            pSize,pSize,LCR_renderer.particleColor,1);
+        }
+
+      r.x *= -2;
+      r.y *= -2;
+      r.z *= -2;
+    }
+  }
+#undef LCR_PARTICLE_SIZE
+
+#endif
+
   LCR_LOG2("3D rendering (end)");
   LCR_LOG2("rendering frame (end)");
 }

settings.h

@@ -221,7 +221,7 @@
 
 #ifndef LCR_SETTING_CAR_RENDER_DISTANCE
   /** Distance in blocks at which player and ghost car will be seen. */
-  #define LCR_SETTING_CAR_RENDER_DISTANCE 25
+  #define LCR_SETTING_CAR_RENDER_DISTANCE 30
 #endif
 
 #ifndef LCR_SETTING_CRASH_SOUNDS
@@ -241,6 +241,11 @@
   #define LCR_SETTING_CAR_TINT 0x07
 #endif
 
+#ifndef LCR_SETTING_PARTICLES
+  /** Can turn particle effects on/off. */
+  #define LCR_SETTING_PARTICLES 1
+#endif
+
 #ifndef LCR_SETTING_ONLY_SMALL_MAPS
   /** Turning this on will only include the small maps in the internal data
     file. This option exists for weak devices that couldn't handle big maps