invisible ambient color

shadersrc/rainbow_lit.frag

@@ -0,0 +1,19 @@
+#version 450
+
+// shader input
+layout(location = 0) in vec4 fragColor;
+
+// output write
+layout(location = 0) out vec4 outColor;
+
+layout(set = 0, binding = 1) uniform  SceneData{
+  vec4 fogColor; // w is for exponent
+  vec4 fogDistances; //x for min, y for max, zw unused.
+  vec4 ambientColor;
+  vec4 sunlightDirection; //w for sun power
+  vec4 sunlightColor;
+} sceneData;
+
+void main() {
+    outColor = vec4(fragColor.xyz + sceneData.ambientColor.xyz, 1.0f);
+}

src/CommandBuffer.hs

@@ -24,7 +24,7 @@ import qualified VulkanMemoryAllocator as VMA
 import Devices
 import Types
 import Memory
-import Util (getFrame)
+import Util
 
 frameOverlap :: Int
 frameOverlap = 2
@@ -41,6 +41,8 @@ createFrames physicalDevice logicalDevice allocator descriptorPool setLayout = d
 
   queueFamilyIndex <- getQueueFamily physicalDevice Vk.QUEUE_GRAPHICS_BIT
 
+  deviceProperties <- Vk.getPhysicalDeviceProperties physicalDevice
+
   let poolCreateInfo = Vk.zero
         { Vk.flags            = Vk.COMMAND_POOL_CREATE_RESET_COMMAND_BUFFER_BIT
         , Vk.queueFamilyIndex = queueFamilyIndex
@@ -49,7 +51,7 @@ createFrames physicalDevice logicalDevice allocator descriptorPool setLayout = d
   graphicsQueue <- Vk.getDeviceQueue logicalDevice queueFamilyIndex 0
 
   frames <- V.mapM
-    (\_ -> do
+    (\index -> do
 
       commandPool <- snd <$> allocate
         (Vk.createCommandPool logicalDevice poolCreateInfo Nothing)
@@ -87,7 +89,6 @@ createFrames physicalDevice logicalDevice allocator descriptorPool setLayout = d
           )
 
       cameraBuffer <- createAllocatedBuffer
-        logicalDevice
         allocator
         (sizeOf (GPUCameraData identity identity identity))
         Vk.BUFFER_USAGE_UNIFORM_BUFFER_BIT
@@ -101,20 +102,35 @@ createFrames physicalDevice logicalDevice allocator descriptorPool setLayout = d
 
       globalDescriptor <- Vk.allocateDescriptorSets logicalDevice allocationInfo
 
-      let bufferInfo = Vk.zero
+      let cameraInfo = Vk.zero
             { Vk.buffer = allocatedBuffer cameraBuffer
             , Vk.offset = 0
             , Vk.range  = fromIntegral $ sizeOf (GPUCameraData identity identity identity)
             } :: Vk.DescriptorBufferInfo
-          setWrite = Vk.zero
-            { Vk.dstBinding      = 0
-            , Vk.dstSet          = V.head globalDescriptor
-            , Vk.descriptorCount = 1
-            , Vk.descriptorType  = Vk.DESCRIPTOR_TYPE_UNIFORM_BUFFER
-            , Vk.bufferInfo      = V.singleton bufferInfo
-            }
+          sceneInfo = Vk.zero
+            { Vk.buffer = allocatedBuffer cameraBuffer
+            , Vk.offset = padUniformBufferSize
+              (fromIntegral $ sizeOf (undefinedGPUSceneData) * fromIntegral index)
+              deviceProperties
+            , Vk.range  = fromIntegral $ sizeOf (undefinedGPUSceneData)
+            } :: Vk.DescriptorBufferInfo
+          cameraWrite = writeDescriptorBuffer
+            Vk.DESCRIPTOR_TYPE_UNIFORM_BUFFER
+            (V.head globalDescriptor)
+            cameraInfo
+            0
+          sceneWrite = writeDescriptorBuffer
+            Vk.DESCRIPTOR_TYPE_UNIFORM_BUFFER
+            (V.head globalDescriptor)
+            sceneInfo
+            1
+          setWrites = V.fromList
+            [ cameraWrite
+            , sceneWrite
+            ]
 
-      Vk.updateDescriptorSets logicalDevice (V.singleton (Vk.SomeStruct setWrite)) V.empty
+
+      Vk.updateDescriptorSets logicalDevice setWrites V.empty
 
       return FrameData
         { framePresentSemaphore  = presentSemaphore
@@ -140,6 +156,9 @@ recordCommandBuffer
   -> Vk.Pipeline
   -> Vk.PipelineLayout
   -> VMA.Allocator
+  -> GPUSceneData
+  -> AllocatedBuffer
+  -> Vk.PhysicalDeviceProperties
   -> FrameData
   -> Int
   -> m ()
@@ -151,6 +170,9 @@ recordCommandBuffer
   graphicsPipeline
   meshLayout
   allocator
+  sceneParameters
+  sceneParameterBuffer
+  deviceProps
   frame
   frameNumber
   = do
@@ -204,6 +226,24 @@ recordCommandBuffer
     Vk.cmdSetViewport commandBuffer 0 (V.singleton viewport)
     Vk.cmdSetScissor commandBuffer 0 (V.singleton scissor)
 
+    let framed = fromIntegral frameNumber / 120
+        ambient = V4 (sin framed) 0 (cos framed) 1
+        frameIndex = frameNumber `mod` frameOverlap
+
+    scenePointer <- VMA.mapMemory allocator (bufferAllocation sceneParameterBuffer)
+
+    liftIO $ poke
+      (castPtr scenePointer `plusPtr`
+        (fromIntegral $
+          padUniformBufferSize (fromIntegral $ sizeOf (undefinedGPUSceneData)) deviceProps *
+            fromIntegral frameIndex))
+      (sceneParameters
+        { ambientColor = ambient
+        }
+        )
+
+    VMA.unmapMemory allocator (bufferAllocation sceneParameterBuffer)
+ 
     renderObjects <- (liftIO . STM.atomically . STM.readTMVar) =<< asks renderables
     meshMap <- (liftIO . STM.atomically . STM.readTMVar) =<< asks meshLibrary
     materialMap <- (liftIO . STM.atomically . STM.readTMVar) =<< asks materialLibrary

src/Draw.hs

@@ -63,6 +63,9 @@ drawFrame engineData frameNumber = do
     (materialPipeline $  matLibrary M.! "defaultMesh")
     (meshPipelineLayout engineData)
     (engineAllocator engineData)
+    (engineSceneParameters engineData)
+    (engineSceneParameterBuffer engineData)
+    (enginePhysicalDeviceProperties engineData)
     frame
     frameNumber
 

src/Init.hs

@@ -10,17 +10,18 @@ import Control.Monad
 import Control.Monad.IO.Class
 import Control.Monad.Reader
 import Control.Monad.Trans.Resource
-import Data.Bits (Bits(bit))
+import Data.Bits ((.|.))
 import qualified Data.Vector as V
 import qualified SDL hiding (V2)
 import qualified SDL.Video.Vulkan as SDL
+import Foreign (sizeOf)
 import Foreign.Ptr
 import Linear as L
+import qualified VulkanMemoryAllocator as VMA
 import qualified Vulkan.Core10 as Vk
 import qualified Vulkan.Extensions.VK_KHR_swapchain as Khr
 import qualified Vulkan.Extensions.VK_KHR_surface as Khr
 import qualified Vulkan.Zero as Vk
-import qualified VulkanMemoryAllocator as VMA
 
 -- internal imports
 
@@ -32,6 +33,7 @@ import Memory
 import Types
 import Mesh
 import CommandBuffer
+import Util
 
 initEngine
   :: Render EngineData
@@ -99,7 +101,7 @@ initVulkan window = do
     createSwapchain vulkanSurface surfaceFormats dimensions vulkanLogicalDevice allocator
   imageViews <- getImageViewHandles swapchain surfaceFormat vulkanLogicalDevice
   meshVertexShader <- loadShader vulkanLogicalDevice "shadersrc/mesh.vert" "vert"
-  meshFragmentShader <- loadShader vulkanLogicalDevice "shadersrc/rainbow.frag" "frag"
+  meshFragmentShader <- loadShader vulkanLogicalDevice "shadersrc/rainbow_lit.frag" "frag"
   renderPass <- createRenderPass vulkanLogicalDevice (Khr.format surfaceFormat) Vk.FORMAT_D32_SFLOAT
   meshLayout <- createMeshPipelineLayout vulkanLogicalDevice descriptorSetLayout
   let meshContainer = ShaderContainer (Just meshVertexShader) (Just meshFragmentShader)
@@ -138,6 +140,19 @@ initVulkan window = do
     descriptorSetLayout
     descriptorPool
     <$> Vk.getPhysicalDeviceProperties vulkanPhysicalDevice
+    <*> pure (GPUSceneData
+      (V4 0 0 0 0)
+      (V4 0 0 0 0)
+      (V4 0 0 0 0)
+      (V4 0 0 0 0)
+      (V4 0 0 0 0)
+      )
+    <*> createAllocatedBuffer
+      allocator
+      (sizeOf (undefinedGPUSceneData))
+      Vk.BUFFER_USAGE_UNIFORM_BUFFER_BIT
+      VMA.MEMORY_USAGE_CPU_TO_GPU
+
 
 initScene :: (MonadReader ReadState m, MonadIO m) => m ()
 initScene = do
@@ -175,15 +190,20 @@ initDescriptors
   => Vk.Device
   -> m (Vk.DescriptorSetLayout, Vk.DescriptorPool)
 initDescriptors device = do
-  let cameraBufferBinding = Vk.zero
-        { Vk.binding         = 0
-        , Vk.descriptorCount = 1
-        , Vk.descriptorType  = Vk.DESCRIPTOR_TYPE_UNIFORM_BUFFER
-        , Vk.stageFlags      = Vk.SHADER_STAGE_VERTEX_BIT
-        }
+  let cameraBind = descriptorsetLayoutBinding
+        Vk.DESCRIPTOR_TYPE_UNIFORM_BUFFER
+        Vk.SHADER_STAGE_VERTEX_BIT
+        0
+      sceneBind = descriptorsetLayoutBinding
+        Vk.DESCRIPTOR_TYPE_UNIFORM_BUFFER_DYNAMIC
+        (Vk.SHADER_STAGE_VERTEX_BIT .|. Vk.SHADER_STAGE_FRAGMENT_BIT)
+        1
       setInfo = Vk.zero
         { Vk.flags = Vk.DESCRIPTOR_SET_LAYOUT_CREATE_UPDATE_AFTER_BIND_POOL_BIT
-        , Vk.bindings = V.singleton cameraBufferBinding
+        , Vk.bindings = V.fromList
+          [ cameraBind
+          , sceneBind
+          ]
         }
       poolInfo = Vk.zero
         { Vk.flags     = Vk.DESCRIPTOR_POOL_CREATE_UPDATE_AFTER_BIND_BIT

src/Memory.hs

@@ -49,13 +49,12 @@ initAllocator physicalDevice device instance' = do
 
 createAllocatedBuffer
   :: (MonadResource m, MonadIO m)
-  => Vk.Device
-  -> VMA.Allocator
+  => VMA.Allocator
   -> Int
   -> Vk.BufferUsageFlags
   -> VMA.MemoryUsage
   -> m AllocatedBuffer
-createAllocatedBuffer device allocator allocationSize usage memoryUsage = do
+createAllocatedBuffer allocator allocationSize usage memoryUsage = do
   let bufferInfo = Vk.zero
         { Vk.size  = fromIntegral allocationSize
         , Vk.usage = usage

src/Types.hs

@@ -42,6 +42,8 @@ data EngineData = EngineData
   , engineGlobalSetLayout          :: Vk.DescriptorSetLayout
   , engineDescriptorPool           :: Vk.DescriptorPool
   , enginePhysicalDeviceProperties :: Vk.PhysicalDeviceProperties
+  , engineSceneParameters          :: GPUSceneData
+  , engineSceneParameterBuffer     :: AllocatedBuffer
   } 
 
 data AllocatedBuffer = AllocatedBuffer
@@ -200,14 +202,46 @@ data GPUCameraData = GPUCameraData
 
 instance Storable GPUCameraData where
 
-  sizeOf (GPUCameraData view projection viewProjection) =
-    sizeOf view + sizeOf projection + sizeOf viewProjection
+  sizeOf (GPUCameraData pview pprojection pviewProjection) =
+    sizeOf pview + sizeOf pprojection + sizeOf pviewProjection
 
   alignment = undefined
 
   peek _ = undefined
 
-  poke ptr (GPUCameraData view projection viewProjection) = do
-    poke (castPtr ptr) view
-    poke (castPtr ptr `plusPtr` sizeOf view) projection
-    poke (castPtr ptr `plusPtr` sizeOf view `plusPtr` sizeOf projection) viewProjection
+  poke ptr (GPUCameraData pview pprojection pviewProjection) = do
+    poke (castPtr ptr) pview
+    poke (castPtr ptr `plusPtr` sizeOf pview) pprojection
+    poke (castPtr ptr `plusPtr` sizeOf pview `plusPtr` sizeOf pprojection) pviewProjection
+
+data GPUSceneData = GPUSceneData
+  { fogColor     :: V4 Float
+  , fogDistance  :: V4 Float
+  , ambientColor :: V4 Float
+  , sunDirection :: V4 Float
+  , sunColor     :: V4 Float
+  }
+
+undefinedGPUSceneData :: GPUSceneData
+undefinedGPUSceneData = GPUSceneData
+  (V4 0 0 0 0)
+  (V4 0 0 0 0)
+  (V4 0 0 0 0)
+  (V4 0 0 0 0)
+  (V4 0 0 0 0)
+
+instance Storable GPUSceneData where
+
+  sizeOf (GPUSceneData fogCol fogDist ambCol sunDir sunCol) =
+    sizeOf fogCol + sizeOf fogDist + sizeOf ambCol + sizeOf sunDir + sizeOf sunCol
+
+  alignment = undefined
+
+  peek _ = undefined
+
+  poke ptr (GPUSceneData fogCol fogDist ambCol sunDir sunCol) = do
+    poke (castPtr ptr) fogCol
+    poke (castPtr ptr `plusPtr` sizeOf fogCol) fogDist
+    poke (castPtr ptr `plusPtr` sizeOf fogCol `plusPtr` sizeOf fogDist) ambCol
+    poke (castPtr ptr `plusPtr` sizeOf fogCol `plusPtr` sizeOf fogDist `plusPtr` sizeOf ambCol) sunDir
+    poke (castPtr ptr `plusPtr` sizeOf fogCol `plusPtr` sizeOf fogDist `plusPtr` sizeOf ambCol `plusPtr` sizeOf sunDir) sunCol

src/Util.hs

@@ -1,7 +1,17 @@
+{-# LANGUAGE DuplicateRecordFields #-}
+{-# LANGUAGE DataKinds #-}
 module Util where
 
+import Data.Bits
+
 import qualified Data.Vector as V
 
+import Data.Word (Word32)
+
+import qualified Vulkan as Vk
+import qualified Vulkan.CStruct.Extends as Vk
+import qualified Vulkan.Zero as Vk
+
 -- internal imports
 
 import Types
@@ -11,3 +21,43 @@ getFrame engineData frame =
   let frameVector = engineFrames engineData
   in
     frameVector V.! (frame `mod` V.length frameVector)
+
+padUniformBufferSize
+  :: Vk.DeviceSize
+  -> Vk.PhysicalDeviceProperties
+  -> Vk.DeviceSize
+padUniformBufferSize origSize gpuProperties =
+  let minUBOAlignment = Vk.minUniformBufferOffsetAlignment $ Vk.limits gpuProperties
+  in
+    if minUBOAlignment > 0
+    then (origSize + minUBOAlignment - 1) .&. complement (minUBOAlignment - 1)
+    else origSize
+
+descriptorsetLayoutBinding
+  :: Vk.DescriptorType
+  -> Vk.ShaderStageFlags
+  -> Word32
+  -> Vk.DescriptorSetLayoutBinding
+descriptorsetLayoutBinding type' stageFlags binding =
+  Vk.zero
+    { Vk.binding           = binding
+    , Vk.descriptorCount   = 1
+    , Vk.descriptorType    = type'
+    , Vk.immutableSamplers = V.empty
+    , Vk.stageFlags        = stageFlags
+    }
+
+writeDescriptorBuffer
+  :: Vk.DescriptorType
+  -> Vk.DescriptorSet
+  -> Vk.DescriptorBufferInfo
+  -> Word32
+  -> Vk.SomeStruct Vk.WriteDescriptorSet
+writeDescriptorBuffer type' dstSet bufferInfo binding = Vk.SomeStruct $
+  Vk.zero
+    { Vk.dstBinding      = binding
+    , Vk.dstSet          = dstSet
+    , Vk.descriptorCount = 1
+    , Vk.descriptorType  = type'
+    , Vk.bufferInfo      = V.singleton bufferInfo
+    }