From a6c8d0c9550f16f179567ac842661544a47c5acb Mon Sep 17 00:00:00 2001
From: PS <slattery.peter.j@gmail.com>
Date: Sat, 14 Nov 2020 12:47:51 -0800
Subject: [PATCH] refactored layer blending

---
 src/app/engine/animation/foldhaus_animation.h | 13 +++++++++
 .../animation/foldhaus_animation_renderer.cpp | 28 +++++++++++++------
 src/app/engine/assembly/foldhaus_assembly.h   | 11 ++++++++
 3 files changed, 44 insertions(+), 8 deletions(-)

diff --git a/src/app/engine/animation/foldhaus_animation.h b/src/app/engine/animation/foldhaus_animation.h
index 80117db..85173d5 100644
--- a/src/app/engine/animation/foldhaus_animation.h
+++ b/src/app/engine/animation/foldhaus_animation.h
@@ -41,6 +41,7 @@ enum blend_mode
     BlendMode_Count,
 };
 
+// TODO(pjs): Add Opacity to this
 typedef pixel led_blend_proc(pixel PixelA, pixel PixelB);
 
 global gs_const_string BlendModeStrings[] = {
@@ -84,10 +85,22 @@ struct animation_array
     u32 CountMax;
 };
 
+struct animation_layer_frame
+{
+    animation_block Hot;
+    animation_block NextHot;
+    bool HasNextHot;
+};
+
 // NOTE(pjs): This is an evaluated frame - across all layers in an
 // animation, these are the blocks that need to be run
 struct animation_frame
 {
+    animation_layer_frame* Layers;
+    b8* LayersFilled;
+    u32 LayersCount;
+    u32 LayersCountMax;
+    
     // NOTE(pjs): These are all parallel arrays of equal length
     animation_block* Blocks;
     b8*              BlocksFilled;
diff --git a/src/app/engine/animation/foldhaus_animation_renderer.cpp b/src/app/engine/animation/foldhaus_animation_renderer.cpp
index dfd8ab6..7839da6 100644
--- a/src/app/engine/animation/foldhaus_animation_renderer.cpp
+++ b/src/app/engine/animation/foldhaus_animation_renderer.cpp
@@ -77,35 +77,47 @@ AnimationSystem_RenderToLedBuffers(animation_system* System, assembly_array Asse
     s32 CurrentFrame = System->CurrentFrame;
     r32 FrameTime = CurrentFrame * System->SecondsPerFrame;
     
+    animation* ActiveAnim = AnimationSystem_GetActiveAnimation(System);
     animation_frame CurrFrame = AnimationSystem_CalculateAnimationFrame(System, Transient);
     
-    led_buffer* LayerLEDBuffers = PushArray(Transient, led_buffer, CurrFrame.BlocksCountMax);
+    led_buffer* LayerLedBuffers = PushArray(Transient, led_buffer, CurrFrame.BlocksCountMax);
+    
     for (u32 AssemblyIndex = 0; AssemblyIndex < Assemblies.Count; AssemblyIndex++)
     {
         assembly* Assembly = &Assemblies.Values[AssemblyIndex];
         led_buffer* AssemblyLedBuffer = LedSystemGetBuffer(LedSystem, Assembly->LedBufferIndex);
         
+        // Create the LayerLEDBuffers
         for (u32 Layer = 0; Layer < CurrFrame.BlocksCountMax; Layer++)
         {
+            led_buffer TempBuffer = {};
+            TempBuffer.LedCount = AssemblyLedBuffer->LedCount;
+            TempBuffer.Positions = AssemblyLedBuffer->Positions;
+            TempBuffer.Colors = PushArray(Transient, pixel, TempBuffer.LedCount);
+            LedBuffer_ClearToBlack(&TempBuffer);
+            
+            LayerLedBuffers[Layer] = TempBuffer;
+        }
+        
+        // Render Each layer's block to the appropriate temp buffer
+        for (u32 Layer = 0; Layer < CurrFrame.BlocksCountMax; Layer++)
+        {
+            led_buffer TempBuffer = LayerLedBuffers[Layer];
+            
             if (!CurrFrame.BlocksFilled[Layer]) { continue; }
             animation_block Block = CurrFrame.Blocks[Layer];
             
-            // Prep Temp Buffer
-            LayerLEDBuffers[Layer] = *AssemblyLedBuffer;
-            LayerLEDBuffers[Layer].Colors = PushArray(Transient, pixel, AssemblyLedBuffer->LedCount);
-            
             u32 FramesIntoBlock = CurrentFrame - Block.Range.Min;
             r32 SecondsIntoBlock = FramesIntoBlock * System->SecondsPerFrame;
             
             // :AnimProcHandle
             u32 AnimationProcIndex = Block.AnimationProcHandle - 1;
             animation_proc* AnimationProc = Patterns[AnimationProcIndex].Proc;
-            AnimationProc(&LayerLEDBuffers[Layer], *Assembly, SecondsIntoBlock, Transient);
+            AnimationProc(&TempBuffer, *Assembly, SecondsIntoBlock, Transient);
         }
         
         // Consolidate Temp Buffers
         // We do this in reverse order so that they go from top to bottom
-        animation* ActiveAnim = AnimationSystem_GetActiveAnimation(System);
         for (u32 Layer = 0; Layer < CurrFrame.BlocksCountMax; Layer++)
         {
             if (!CurrFrame.BlocksFilled[Layer]) { continue; }
@@ -115,7 +127,7 @@ AnimationSystem_RenderToLedBuffers(animation_system* System, assembly_array Asse
             for (u32 LED = 0; LED < AssemblyLedBuffer->LedCount; LED++)
             {
                 pixel A = AssemblyLedBuffer->Colors[LED];
-                pixel B = LayerLEDBuffers[Layer].Colors[LED];
+                pixel B = LayerLedBuffers[Layer].Colors[LED];
                 AssemblyLedBuffer->Colors[LED] = Blend(A, B);
             }
         }
diff --git a/src/app/engine/assembly/foldhaus_assembly.h b/src/app/engine/assembly/foldhaus_assembly.h
index 94982a5..f1d7ba9 100644
--- a/src/app/engine/assembly/foldhaus_assembly.h
+++ b/src/app/engine/assembly/foldhaus_assembly.h
@@ -168,6 +168,17 @@ LedSystemGetBuffer(led_system* System, u32 Index)
     return Result;
 }
 
+internal void
+LedBuffer_ClearToBlack(led_buffer* Buffer)
+{
+    for (u32 i = 0; i < Buffer->LedCount; i++)
+    {
+        Buffer->Colors[i].R = 0;
+        Buffer->Colors[i].G = 0;
+        Buffer->Colors[i].B = 0;
+    }
+}
+
 internal u32
 StripGenData_CountLeds(strip_gen_data Data)
 {