Graphics: Move skinning to a separate module

src/Nazara/Graphics/Graphics.cpp

@@ -53,6 +53,14 @@ namespace Nz
 			#include <Nazara/Graphics/Resources/Shaders/Modules/Engine/SkeletalData.nzslb.h>
 		};
 
+		const UInt8 r_skinningDataModule[] = {
+			#include <Nazara/Graphics/Resources/Shaders/Modules/Engine/SkinningData.nzslb.h>
+		};
+
+		const UInt8 r_skinningLinearModule[] = {
+			#include <Nazara/Graphics/Resources/Shaders/Modules/Engine/SkinningLinear.nzslb.h>
+		};
+
 		const UInt8 r_viewerDataModule[] = {
 			#include <Nazara/Graphics/Resources/Shaders/Modules/Engine/ViewerData.nzslb.h>
 		};
@@ -321,6 +329,8 @@ namespace Nz
 		RegisterEmbedShaderModule(r_mathCookTorrancePBRModule);
 		RegisterEmbedShaderModule(r_phongMaterialShader);
 		RegisterEmbedShaderModule(r_physicallyBasedMaterialShader);
+		RegisterEmbedShaderModule(r_skinningDataModule);
+		RegisterEmbedShaderModule(r_skinningLinearModule);
 		RegisterEmbedShaderModule(r_skeletalDataModule);
 		RegisterEmbedShaderModule(r_textureBlitShader);
 		RegisterEmbedShaderModule(r_viewerDataModule);

src/Nazara/Graphics/Resources/Shaders/BasicMaterial.nzsl

@@ -4,6 +4,7 @@ module BasicMaterial;
 import InstanceData from Engine.InstanceData;
 import SkeletalData from Engine.SkeletalData;
 import ViewerData from Engine.ViewerData;
+import SkinLinearPosition from Engine.SkinningLinear;
 
 // Pass-specific options
 option DepthPass: bool = false;
@@ -175,23 +176,24 @@ fn billboardMain(input: VertIn) -> VertOut
 fn main(input: VertIn) -> VertOut
 {
 	let pos: vec3[f32];
+
 	const if (HasSkinning)
 	{
-		pos = vec3[f32](0.0, 0.0, 0.0);
+		let jointMatrices = array[mat4[f32]](
+			skeletalData.jointMatrices[input.jointIndices[0]],
+			skeletalData.jointMatrices[input.jointIndices[1]],
+			skeletalData.jointMatrices[input.jointIndices[2]],
+			skeletalData.jointMatrices[input.jointIndices[3]]
+		);
 
-		[unroll]
-		for i in 0 -> 4
-		{
-			let jointIndex = input.jointIndices[i];
-			let jointWeight = input.jointWeights[i];
-
-			let jointMatrix = skeletalData.JointMatrices[jointIndex];
-			pos += (jointMatrix * vec4[f32](input.pos, 1.0)).xyz * jointWeight;
-		}
+		let skinningOutput = SkinLinearPosition(jointMatrices, input.jointWeights, input.pos);
+		pos = skinningOutput.position;
 	}
 	else
 		pos = input.pos;
 
+	let worldPosition = instanceData.worldMatrix * vec4[f32](pos, 1.0);
+
 	let output: VertOut;
 	output.position = viewerData.viewProjMatrix * instanceData.worldMatrix * vec4[f32](pos, 1.0);
 

src/Nazara/Graphics/Resources/Shaders/Modules/Engine/SkeletalData.nzsl

@@ -9,5 +9,5 @@ const MaxJointCount: u32 = u32(256); //< FIXME: Fix integral value types
 [layout(std140)]
 struct SkeletalData
 {
-	JointMatrices: array[mat4[f32], MaxJointCount]
+	jointMatrices: array[mat4[f32], MaxJointCount]
 }

src/Nazara/Graphics/Resources/Shaders/Modules/Engine/SkinningData.nzsl

@@ -0,0 +1,23 @@
+[nzsl_version("1.0")]
+module Engine.SkinningData;
+
+[export]
+struct SkinPositionOutput
+{
+    position: vec3[f32]
+}
+
+[export]
+struct SkinPositionNormalOutput
+{
+    position: vec3[f32],
+    normal: vec3[f32]
+}
+
+[export]
+struct SkinPositionNormalTangentOutput
+{
+    position: vec3[f32],
+    normal: vec3[f32],
+    tangent: vec3[f32]
+}

src/Nazara/Graphics/Resources/Shaders/Modules/Engine/SkinningLinear.nzsl

@@ -0,0 +1,35 @@
+[nzsl_version("1.0")]
+module Engine.SkinningLinear;
+
+import * from Engine.SkinningData;
+
+[export]
+fn SkinLinearPosition(jointMatrices: array[mat4[f32], 4], jointWeights: vec4[f32], position: vec3[f32]) -> SkinPositionOutput
+{
+    let skinMatrix = mat4[f32](0.0);
+
+    [unroll]
+    for i in 0 -> 4
+        skinMatrix += jointMatrices[i] * jointWeights[i];
+
+    let output: SkinPositionOutput;
+    output.position = (skinMatrix * vec4[f32](position, 1.0)).xyz;
+    return output;
+}
+
+[export]
+fn SkinLinearPositionNormal(jointMatrices: array[mat4[f32], 4], jointWeights: vec4[f32], position: vec3[f32], normal: vec3[f32]) -> SkinPositionNormalOutput
+{
+    let skinMatrix = mat4[f32](0.0);
+
+    [unroll]
+    for i in 0 -> 4
+        skinMatrix += jointMatrices[i] * jointWeights[i];
+
+    let inverseTransposeSkinMatrix = transpose(inverse(mat3[f32](skinMatrix)));
+
+    let output: SkinPositionNormalOutput;
+    output.position = (skinMatrix * vec4[f32](position, 1.0)).xyz;
+    output.normal = inverseTransposeSkinMatrix * normal;
+    return output;
+}

src/Nazara/Graphics/Resources/Shaders/PhongMaterial.nzsl

@@ -6,6 +6,8 @@ import LightData from Engine.LightData;
 import SkeletalData from Engine.SkeletalData;
 import ViewerData from Engine.ViewerData;
 
+import SkinLinearPosition, SkinLinearPositionNormal from Engine.SkinningLinear;
+
 // Pass-specific options
 option DepthPass: bool = false;
 
@@ -33,13 +35,16 @@ option VertexPositionLoc: i32;
 option VertexTangentLoc: i32 = -1;
 option VertexUvLoc: i32 = -1;
 
+option VertexJointIndicesLoc: i32 = -1;
+option VertexJointWeightsLoc: i32 = -1;
+
 const HasNormal = (VertexNormalLoc >= 0);
 const HasVertexColor = (VertexColorLoc >= 0);
 const HasColor = (HasVertexColor || Billboard);
 const HasTangent = (VertexTangentLoc >= 0);
 const HasUV = (VertexUvLoc >= 0);
 const HasNormalMapping = HasNormalTexture && HasNormal && HasTangent && !DepthPass;
-
+const HasSkinning = (VertexJointIndicesLoc >= 0 && VertexJointWeightsLoc >= 0);
 
 [layout(std140)]
 struct MaterialSettings
@@ -272,6 +277,12 @@ struct VertIn
 	[cond(HasTangent), location(VertexTangentLoc)]
 	tangent: vec3[f32],
 
+	[cond(HasSkinning), location(VertexJointIndicesLoc)]
+	jointIndices: vec4[i32],
+
+	[cond(HasSkinning), location(VertexJointWeightsLoc)]
+	jointWeights: vec4[f32],
+
 	[cond(Billboard), location(BillboardCenterLocation)]
 	billboardCenter: vec3[f32],
 
@@ -316,7 +327,38 @@ fn billboardMain(input: VertIn) -> VertToFrag
 [entry(vert), cond(!Billboard)]
 fn main(input: VertIn) -> VertToFrag
 {
-	let worldPosition = instanceData.worldMatrix * vec4[f32](input.pos, 1.0);
+	let pos: vec3[f32];
+	const if (HasNormal) let normal: vec3[f32];
+
+	const if (HasSkinning)
+	{
+		let jointMatrices = array[mat4[f32]](
+			skeletalData.jointMatrices[input.jointIndices[0]],
+			skeletalData.jointMatrices[input.jointIndices[1]],
+			skeletalData.jointMatrices[input.jointIndices[2]],
+			skeletalData.jointMatrices[input.jointIndices[3]]
+		);
+
+		const if (HasNormal)
+		{
+			let skinningOutput = SkinLinearPositionNormal(jointMatrices, input.jointWeights, input.pos, input.normal);
+			pos = skinningOutput.position;
+			normal = skinningOutput.normal;
+		}
+		else
+		{
+			let skinningOutput = SkinLinearPosition(jointMatrices, input.jointWeights, input.pos);
+			pos = skinningOutput.position;
+		}
+	}
+	else
+	{
+		pos = input.pos;
+		const if (HasNormal)
+			normal = input.normal;
+	}
+
+	let worldPosition = instanceData.worldMatrix * vec4[f32](pos, 1.0);
 
 	let output: VertToFrag;
 	output.worldPos = worldPosition.xyz;
@@ -328,7 +370,7 @@ fn main(input: VertIn) -> VertToFrag
 		output.color = input.color;
 
 	const if (HasNormal)
-		output.normal = rotationMatrix * input.normal;
+		output.normal = rotationMatrix * normal;
 
 	const if (HasUV)
 		output.uv = input.uv;

src/Nazara/Graphics/Resources/Shaders/PhysicallyBasedMaterial.nzsl

@@ -6,6 +6,8 @@ import LightData from Engine.LightData;
 import SkeletalData from Engine.SkeletalData;
 import ViewerData from Engine.ViewerData;
 
+import SkinLinearPosition, SkinLinearPositionNormal from Engine.SkinningLinear;
+
 // Pass-specific options
 option DepthPass: bool = false;
 
@@ -35,12 +37,16 @@ option VertexPositionLoc: i32;
 option VertexTangentLoc: i32 = -1;
 option VertexUvLoc: i32 = -1;
 
+option VertexJointIndicesLoc: i32 = -1;
+option VertexJointWeightsLoc: i32 = -1;
+
 const HasNormal = (VertexNormalLoc >= 0);
 const HasVertexColor = (VertexColorLoc >= 0);
 const HasColor = (HasVertexColor || Billboard);
 const HasTangent = (VertexTangentLoc >= 0);
 const HasUV = (VertexUvLoc >= 0);
 const HasNormalMapping = HasNormalTexture && HasNormal && HasTangent && !DepthPass;
+const HasSkinning = (VertexJointIndicesLoc >= 0 && VertexJointWeightsLoc >= 0);
 
 [layout(std140)]
 struct MaterialSettings
@@ -260,6 +266,12 @@ struct VertIn
 	[cond(HasTangent), location(VertexTangentLoc)]
 	tangent: vec3[f32],
 
+	[cond(HasSkinning), location(VertexJointIndicesLoc)]
+	jointIndices: vec4[i32],
+
+	[cond(HasSkinning), location(VertexJointWeightsLoc)]
+	jointWeights: vec4[f32],
+
 	[cond(Billboard), location(BillboardCenterLocation)]
 	billboardCenter: vec3[f32],
 
@@ -304,7 +316,38 @@ fn billboardMain(input: VertIn) -> VertToFrag
 [entry(vert), cond(!Billboard)]
 fn main(input: VertIn) -> VertToFrag
 {
-	let worldPosition = instanceData.worldMatrix * vec4[f32](input.pos, 1.0);
+	let pos: vec3[f32];
+	const if (HasNormal) let normal: vec3[f32];
+
+	const if (HasSkinning)
+	{
+		let jointMatrices = array[mat4[f32]](
+			skeletalData.jointMatrices[input.jointIndices[0]],
+			skeletalData.jointMatrices[input.jointIndices[1]],
+			skeletalData.jointMatrices[input.jointIndices[2]],
+			skeletalData.jointMatrices[input.jointIndices[3]]
+		);
+
+		const if (HasNormal)
+		{
+			let skinningOutput = SkinLinearPositionNormal(jointMatrices, input.jointWeights, input.pos, input.normal);
+			pos = skinningOutput.position;
+			normal = skinningOutput.normal;
+		}
+		else
+		{
+			let skinningOutput = SkinLinearPosition(jointMatrices, input.jointWeights, input.pos);
+			pos = skinningOutput.position;
+		}
+	}
+	else
+	{
+		pos = input.pos;
+		const if (HasNormal)
+			normal = input.normal;
+	}
+
+	let worldPosition = instanceData.worldMatrix * vec4[f32](pos, 1.0);
 
 	let output: VertToFrag;
 	output.worldPos = worldPosition.xyz;