Merge pull request #145 from teamfisk/Shadows

Shadows

include/Engine/Rendering/DrawFinalPass.h

@@ -11,11 +11,12 @@
 #include "Util/UnorderedMapVec2.h"
 #include "Util/CommonFunctions.h"
 #include "Texture.h"
+#include "ShadowPass.h"
 
 class DrawFinalPass
 {
 public:
-    DrawFinalPass(IRenderer* renderer, LightCullingPass* lightCullingPass, CubeMapPass* cubeMapPass, SSAOPass* ssaoPass);
+    DrawFinalPass(IRenderer* renderer, LightCullingPass* lightCullingPass, CubeMapPass* cubeMapPass, SSAOPass* ssaoPass, ShadowPass* shadowPass);
     ~DrawFinalPass() { }
     void InitializeTextures();
     void InitializeFrameBuffers();
@@ -65,6 +66,7 @@ private:
     const LightCullingPass* m_LightCullingPass;
     const CubeMapPass* m_CubeMapPass;
 	const SSAOPass* m_SSAOPass;
+	const ShadowPass* m_ShadowPass;
 
     ShaderProgram* m_ForwardPlusProgram;
     ShaderProgram* m_ExplosionEffectProgram;

include/Engine/Rendering/Renderer.h

@@ -26,6 +26,7 @@
 #include "TextPass.h"
 #include "Util/CommonFunctions.h"
 #include "Core/PerformanceTimer.h"
+#include "ShadowPass.h"
 
 class Renderer : public IRenderer
 {
@@ -75,6 +76,7 @@ private:
     DrawColorCorrectionPass* m_DrawColorCorrectionPass;
 	SSAOPass* m_SSAOPass;
     CubeMapPass* m_CubeMapPass;
+	ShadowPass* m_ShadowPass;
 
     //----------------------Functions----------------------//
     void InitializeWindow();

include/Engine/Rendering/ShadowPass.h

@@ -0,0 +1,87 @@
+#ifndef ShadowPass_h__
+#define ShadowPass_h__
+
+#include "IRenderer.h"
+#include "FrameBuffer.h"
+#include "ShaderProgram.h"
+#include "../Core/EventBroker.h"
+#include "../Core/World.h"
+#include "ShadowPassState.h"
+#include "imgui/imgui.h"
+
+#define MAX_SPLITS 4
+
+enum NearFar { NEAR = 0, FAR = 1 };
+enum LRBT { LEFT = 0, RIGHT = 1, BOTTOM = 2, TOP = 3 };
+
+struct ShadowFrustum
+{
+	float NearClip;
+	float FarClip;
+	float FOV;
+	float AspectRatio;
+	glm::vec3 MiddlePoint;
+	float Radius;
+	std::array<float, 4> LRBT;
+	std::array<glm::vec3, 8> CornerPoint;
+};
+
+class ShadowPass
+{
+public:
+	ShadowPass(IRenderer* renderer);
+	ShadowPass(IRenderer * renderer, int ShadowResX, int ShadowResY);
+	~ShadowPass();
+
+	void InitializeFrameBuffers();
+	void InitializeShaderPrograms();
+	void ClearBuffer();
+	void Draw(RenderScene& scene);
+
+	void DebugGUI();
+
+	GLuint DepthMap() const { return m_DepthMap; }
+	std::array<glm::mat4, MAX_SPLITS> LightP() const { return m_LightProjection; }
+	std::array<glm::mat4, MAX_SPLITS> LightV() const { return m_LightView; }
+	std::array<float, MAX_SPLITS> FarDistance() const { std::array<float, MAX_SPLITS> f; for (int i = 0; i < MAX_SPLITS; i++) f[i] = m_shadowFrusta[i].FarClip; return f; }
+	int CurrentNrOfSplits() const { return m_CurrentNrOfSplits; }
+
+	void SetSplitWeight(float split_weight) { m_SplitWeight = split_weight; };
+private:
+	void InitializeCameras(RenderScene & scene);
+	void UpdateSplitDist(std::array<ShadowFrustum, MAX_SPLITS>& frusta, float near_distance, float far_distance);
+	void UpdateFrustumPoints(ShadowFrustum& frustum, glm::vec3 camera_position, glm::vec3 view_dir);
+	void UpdateFrustumPoints(ShadowFrustum& frustum, glm::mat4 p, glm::mat4 v);
+
+	void PointsToLightspace(ShadowFrustum& frustum, glm::mat4 v);
+
+	float FindRadius(ShadowFrustum& frustum);
+	void RadiusToLightspace(ShadowFrustum& frustum);
+
+	EventBroker* m_EventBroker;
+	const IRenderer* m_Renderer;
+
+	GLuint m_DepthMap;
+	FrameBuffer m_DepthBuffer;
+	ShaderProgram* m_ShadowProgram;
+
+	std::array<glm::mat4, MAX_SPLITS> m_LightProjection;
+	std::array<glm::mat4, MAX_SPLITS> m_LightView;
+
+	GLfloat m_NearFarPlane[2] = { -34.f, 27.f };
+	GLuint m_ResolutionSizeWidth = 1024 * 2;
+	GLuint m_ResolutionSizeHeight = 1024 * 2;
+
+	bool m_TransparentObjects = false;
+	bool m_TexturedShadows = false;
+	bool m_EnableShadows = true;
+
+	int m_CurrentNrOfSplits = 4;
+	float m_SplitWeight = 0.962f;
+
+	std::array<ShadowFrustum, MAX_SPLITS> m_shadowFrusta;
+
+	Texture* m_WhiteTexture = ResourceManager::Load<Texture>("Textures/Core/White.png");
+};
+
+#endif

include/Engine/Rendering/ShadowPassState.h

@@ -0,0 +1,15 @@
+#ifndef ShadowPassState_h_
+#define ShadowPassState_h_
+
+#include "Rendering/RenderState.h"
+
+class ShadowPassState : public RenderState
+{
+public:
+	ShadowPassState(GLuint frameBuffer);
+	~ShadowPassState();
+
+private:
+};
+
+#endif

resources/Schema/Entities/GameMap.xml

@@ -245,6 +245,13 @@
         </Entity>
       </Children>
     </Entity>
+    <Entity name="Ambient">
+      <Components>
+        <c:SceneLight/>
+        <c:Transform/>
+      </Components>
+      <Children/>
+    </Entity>
   </Children>
 
 </Entity>

resources/Schema/Entities/QualityAssurance.xml

@@ -559,8 +559,8 @@
         <Entity name="Cube1">
           <Components>
             <c:Model>
-              <Resource>Models/Core/UnitCube.mesh</Resource>
+              <Resource>Models/BushAlive.mesh</Resource>
-              <Color A="0.505882382" B="0" G="1" R="0"/>
+              <Color A="1" B="0" G="1" R="0"/>
               <Transparent>true</Transparent>
             </c:Model>
             <c:Transform>

resources/Shaders/ExplosionEffect.geom.glsl

@@ -1,5 +1,7 @@
 #version 430
 
+#define MAX_SPLITS 4
+
 uniform mat4 M;
 uniform mat4 V;
 uniform mat4 P;
@@ -22,6 +24,7 @@ in VertexData{
 	vec2 TextureCoordinate;
 	vec4 ExplosionColor;
 	float ExplosionPercentageElapsed;
+	vec4 PositionLightSpace[MAX_SPLITS];
 }Input[];
 
 out VertexData{
@@ -32,6 +35,7 @@ out VertexData{
 	vec2 TextureCoordinate;
 	vec4 ExplosionColor;
 	float ExplosionPercentageElapsed;
+	vec4 PositionLightSpace[MAX_SPLITS];
 }Output;
 
 layout(triangles) in;
@@ -145,6 +149,7 @@ void main()
 			Output.TextureCoordinate = Input[i].TextureCoordinate;
 			Output.Tangent = Input[i].Tangent;
 			Output.BiTangent = Input[i].BiTangent;
+			Output.PositionLightSpace = Input[i].PositionLightSpace;
 			
 			// convert to model space for the gravity to always be in -y
 			vec4 ExplodedPositionInModelSpace = M * vec4(ExplodedPosition, 1.0);
@@ -186,6 +191,7 @@ void main()
 			Output.TextureCoordinate = Input[i].TextureCoordinate;
 			Output.Tangent = Input[i].Tangent;
 			Output.BiTangent = Input[i].BiTangent;
+			Output.PositionLightSpace = Input[i].PositionLightSpace;
 
 			// no change in position, pass through vertex
 			gl_Position = gl_in[i].gl_Position;

resources/Shaders/ForwardPlus.frag.glsl

@@ -1,6 +1,7 @@
 #version 430
 
 #define MIN_AMBIENT_LIGHT 0.3
+#define MAX_SPLITS 4
 
 uniform mat4 M;
 uniform mat4 V;
@@ -14,6 +15,7 @@ uniform float FillPercentage;
 uniform float GlowIntensity = 10;
 uniform vec3 CameraPosition;
 uniform int SSAOQuality;
+uniform float FarDistance[MAX_SPLITS];
 
 uniform vec2 DiffuseUVRepeat;
 uniform vec2 NormalUVRepeat;
@@ -25,6 +27,7 @@ layout (binding = 2) uniform sampler2D NormalMapTexture;
 layout (binding = 3) uniform sampler2D SpecularMapTexture;
 layout (binding = 4) uniform sampler2D GlowMapTexture;
 layout (binding = 5) uniform samplerCube CubeMap;
+layout (binding = 13) uniform sampler2DArrayShadow DepthMap;
 
 #define TILE_SIZE 16
 
@@ -59,7 +62,6 @@ layout (std430, binding = 4) buffer LightIndexBuffer
 	float LightIndex[];
 };
 
-
 in VertexData{
 	vec3 Position;
 	vec3 Normal;
@@ -68,6 +70,7 @@ in VertexData{
 	vec2 TextureCoordinate;
 	vec4 ExplosionColor;
 	float ExplosionPercentageElapsed;
+	vec4 PositionLightSpace[MAX_SPLITS];
 }Input;
 
 out vec4 sceneColor;
@@ -78,6 +81,25 @@ struct LightResult {
 	vec4 Specular;
 };
 
+vec2 poissonDisk[16] = vec2[]( 
+	vec2( -0.94201624, -0.39906216 ), 
+	vec2( 0.94558609, -0.76890725 ), 
+	vec2( -0.094184101, -0.92938870 ), 
+	vec2( 0.34495938, 0.29387760 ), 
+	vec2( -0.91588581, 0.45771432 ), 
+	vec2( -0.81544232, -0.87912464 ), 
+	vec2( -0.38277543, 0.27676845 ), 
+	vec2( 0.97484398, 0.75648379 ), 
+	vec2( 0.44323325, -0.97511554 ), 
+	vec2( 0.53742981, -0.47373420 ), 
+	vec2( -0.26496911, -0.41893023 ), 
+	vec2( 0.79197514, 0.19090188 ), 
+	vec2( -0.24188840, 0.99706507 ), 
+	vec2( -0.81409955, 0.91437590 ), 
+	vec2( 0.19984126, 0.78641367 ), 
+	vec2( 0.14383161, -0.14100790 ) 
+	);
+
 float CalcAttenuation(float radius, float dist, float falloff) {
 	return 1.0 - smoothstep(radius * falloff, radius, dist);
 }
@@ -124,6 +146,154 @@ vec4 CalcNormalMappedValue(vec3 normal, vec3 tangent, vec3 bitangent, vec2 textu
 	return vec4(TBN * normalize(NormalMap), 0.0);
 }
 
+// Returns a "random" value.
+float Random(vec3 seed, int i)
+{
+	vec4 seed4 = vec4(seed, i);
+	float dot_product = dot(seed4, vec4(12.9898, 78.233, 45.164, 94.673));
+	return fract(sin(dot_product) * 43758.5453);
+}
+
+int getShadowIndex(float far_distance[1])
+{
+	return 0;
+}
+
+int getShadowIndex(float far_distance[2])
+{
+	float depth = gl_FragCoord.z / gl_FragCoord.w;
+	
+	int index = 1;
+	if ( depth < far_distance[0] )
+	{
+		index = 0;
+	}
+
+	return index;
+}
+
+int getShadowIndex(float far_distance[3])
+{
+	float depth = gl_FragCoord.z / gl_FragCoord.w;
+	
+	int index = 2;
+	if ( depth < far_distance[0] )
+	{
+		index = 0;
+	}
+	else if ( depth < far_distance[1] && depth > far_distance[0] )
+	{
+		index = 1;
+	}
+
+	return index;
+}
+
+int getShadowIndex(float far_distance[4])
+{
+	float depth = gl_FragCoord.z / gl_FragCoord.w;
+	
+	int index = 3;
+	if ( depth < far_distance[0] )
+	{
+		index = 0;
+	}
+	else if ( depth < far_distance[1] && depth > far_distance[0] )
+	{
+		index = 1;
+	}
+	else if ( depth < far_distance[2] && depth > far_distance[1] )
+	{
+		index = 2;
+	}
+
+	return index;
+}
+
+// Standard hardware-calculated PCF method
+float PCFShadow(sampler2DArrayShadow depth_texture_array, vec3 projection_coords, int layer_index)
+{
+	return texture(depth_texture_array, vec4(projection_coords.xy, layer_index, projection_coords.z));
+}
+
+// PCF + Poisson model method
+float PoissonShadow(sampler2DArrayShadow depth_texture_array, vec3 projection_coords, int layer_index, int taps, float spread)
+{
+	int loop;
+	float multiplier = 1.0 / float(taps);
+	float shadowMapDepth;
+	
+    for (int i = 0; i < taps; i++)
+	{
+		loop = i;
+		vec3 newProjCoords = projection_coords + vec3(poissonDisk[loop], 0.0) / (spread * (1.0 + layer_index));
+		shadowMapDepth += multiplier * texture(depth_texture_array, vec4(newProjCoords.xy, layer_index, newProjCoords.z));
+	}
+	
+	return shadowMapDepth;
+}
+
+// PCF + Poisson + RandomSample model method
+float PoissonDotShadow(sampler2DArrayShadow depth_texture_array, vec3 projection_coords, int layer_index, int taps, float spread)
+{
+	int loop;
+	float multiplier = 1.0 / float(taps);
+	float shadowMapDepth;
+	
+    for (int i = 0; i < taps; i++)
+	{
+		loop = int(16.0 * Random(gl_FragCoord.xyy, i)) % 16;
+		vec3 newProjCoords = projection_coords + vec3(poissonDisk[loop], 0.0) / (spread * (1.0 + layer_index));
+		shadowMapDepth += multiplier * texture(depth_texture_array, vec4(newProjCoords.xy, layer_index, newProjCoords.z));
+	}
+	
+	return shadowMapDepth;
+}
+
+// Hardware PCF + Additional software PCF method
+float SoftwarePCF(sampler2DArrayShadow depth_texture_array, vec3 projection_coords, int layer_index, float bias)
+{
+	float shadow = 0.0;
+	
+	vec3 texelSize = 1.0 / textureSize(depth_texture_array, 0);
+	for(int x = -1; x <= 1; x++)
+	{
+		for(int y = -1; y <= 1; y++)
+		{
+			shadow += texture(depth_texture_array, vec4(projection_coords.xy + vec2(x, y) * texelSize.xy / (1.0 + layer_index), layer_index, projection_coords.z)); 
+		}    
+	}
+	
+	return shadow / 9.0;
+}
+
+float CalcShadowValue(vec4 light_space_pos, vec3 normal, vec3 light_dir, sampler2DArrayShadow depth_texture_array, int layer_index)
+{
+	float shadowMapDepth;
+	float bias = 0.005;
+	
+	// Various bias methods.
+	
+	//bias = max(0.05 * (1.0 - dot(normal, light_dir)), bias);
+	//bias = bias * tan(acos(clamp(dot(normal, -light_dir), 0.0, 1.0)));
+	bias = bias + bias * tan(acos(clamp(dot(normal, -light_dir), 0.0, 1.0)));
+	
+	// Calculate coordinates in projection space.
+	
+    vec3 projCoords = vec3(light_space_pos.xy, light_space_pos.z + bias) / light_space_pos.w;
+    projCoords = projCoords * 0.5 + 0.5;
+	//projCoords = (floor(projCoords * 255.0)) / 255.0;
+	
+	// Various methods for shadow calculation in fastest to slowest order.
+	
+	//shadowMapDepth = PCFShadow(depth_texture_array, projCoords, layer_index);
+	//shadowMapDepth = PoissonShadow(depth_texture_array, projCoords, layer_index, 4, 25.0 * FarDistance[MAX_SPLITS - 1]);
+	//shadowMapDepth = PoissonDotShadow(depth_texture_array, projCoords, layer_index, 4, 25.0 * FarDistance[MAX_SPLITS - 1]);
+	shadowMapDepth = SoftwarePCF(depth_texture_array, projCoords, layer_index, bias);
+
+    return shadowMapDepth;
+}
+
 void main()
 {
 	float ao = texelFetch(AOTexture, ivec2(gl_FragCoord.xy) >> int(SSAOQuality), 0).r;
@@ -152,6 +322,8 @@ void main()
 	int start = int(LightGrids.Data[currentTile].Start);
 	int amount = int(LightGrids.Data[currentTile].Amount);
 	
+	float shadowFactor = 0.0;
+
 	for(int i = start; i < start + amount; i++) {
 
 		int l = int(LightIndex[i]);
@@ -162,12 +334,17 @@ void main()
 		if(light.Type == 1) { // point
 			light_result = CalcPointLightSource(V * light.Position, light.Radius, light.Color, light.Intensity, viewVec, position, normal, light.Falloff);
 		} else if (light.Type == 2) { //Directional
+			int DepthMapIndex = getShadowIndex(FarDistance);
 			light_result = CalcDirectionalLightSource(V * light.Direction, light.Color, light.Intensity, viewVec, normal);
+			shadowFactor = CalcShadowValue(Input.PositionLightSpace[DepthMapIndex], Input.Normal, vec3(light.Direction), DepthMap, DepthMapIndex);
 		}
 		totalLighting.Diffuse += vec4(light_result.Diffuse.rgb * ao, light_result.Diffuse.a);
 		totalLighting.Specular += vec4(light_result.Specular.rgb * ao, light_result.Specular.a);
 	}
 	
+	totalLighting.Diffuse *= vec4(min(vec3(shadowFactor) + AmbientColor.xyz, vec3(1.0)), 1.0);
+	totalLighting.Specular *= vec4(min(vec3(shadowFactor) + AmbientColor.xyz, vec3(1.0)), 1.0);
+
 	vec4 color_result = mix((Color * diffuseTexel * DiffuseColor), Input.ExplosionColor, Input.ExplosionPercentageElapsed);
 	color_result = color_result * (totalLighting.Diffuse + (totalLighting.Specular * specularTexel));
 	float specularResult = (specularTexel.r + specularTexel.g + specularTexel.b)/3.0;

resources/Shaders/ForwardPlus.vert.glsl

@@ -1,8 +1,12 @@
 #version 430
 
+#define MAX_SPLITS 4
+
 uniform mat4 M;
 uniform mat4 V;
 uniform mat4 P;
+uniform mat4 LightV[MAX_SPLITS];
+uniform mat4 LightP[MAX_SPLITS];
 
 layout(location = 0) in vec3 Position;
 layout(location = 1) in vec3 Normal;
@@ -18,6 +22,7 @@ out VertexData{
 	vec2 TextureCoordinate;
 	vec4 ExplosionColor;
 	float ExplosionPercentageElapsed;
+	vec4 PositionLightSpace[MAX_SPLITS];
 }Output;
 
 void main()
@@ -31,4 +36,9 @@ void main()
  	Output.BiTangent = vec3(TIM * vec4(BiTangent, 0.0));
 	Output.ExplosionColor = vec4(1.0);
 	Output.ExplosionPercentageElapsed = 0.0;
+	
+	for(int i = 0; i < MAX_SPLITS; i++)
+	{
+		Output.PositionLightSpace[i] = LightP[i] * LightV[i] * M * vec4(Position, 1.0);
+	}
 }

resources/Shaders/ForwardPlusShieldCheck.frag.glsl

@@ -1,6 +1,7 @@
 #version 430
 
 #define MIN_AMBIENT_LIGHT 0.3
+#define MAX_SPLITS 4
 
 uniform mat4 M;
 uniform mat4 V;
@@ -69,6 +70,7 @@ in VertexData{
 	vec2 TextureCoordinate;
 	vec4 ExplosionColor;
 	float ExplosionPercentageElapsed;
+	vec4 PositionLightSpace[MAX_SPLITS];
 }Input;
 
 out vec4 sceneColor;

resources/Shaders/ForwardPlusSkinned.vert.glsl

@@ -1,9 +1,13 @@
 #version 430
 
+#define MAX_SPLITS 4
+
 uniform mat4 M;
 uniform mat4 V;
 uniform mat4 P;
 uniform mat4 Bones[100];
+uniform mat4 LightV[MAX_SPLITS];
+uniform mat4 LightP[MAX_SPLITS];
 
 layout(location = 0) in vec3 Position;
 layout(location = 1) in vec3 Normal;
@@ -21,6 +25,7 @@ out VertexData{
 	vec2 TextureCoordinate;
 	vec4 ExplosionColor;
 	float ExplosionPercentageElapsed;
+	vec4 PositionLightSpace[MAX_SPLITS];
 }Output;
 
 void main()
@@ -43,4 +48,9 @@ void main()
  	Output.BiTangent = vec3(M * vec4(BiTangent, 0.0));
 	Output.ExplosionColor = vec4(1.0);
 	Output.ExplosionPercentageElapsed = 0.0;
+	
+	for(int i = 0; i < MAX_SPLITS; i++)
+	{
+		Output.PositionLightSpace[i] = LightP[i] * LightV[i] * M * boneTransform * vec4(Position, 1.0);
+	}
 }

resources/Shaders/ForwardPlusSplatMap.frag.glsl

@@ -1,5 +1,7 @@
 #version 430
 
+#define MAX_SPLITS 4
+
 uniform mat4 M;
 uniform mat4 V;
 uniform mat4 P;
@@ -95,6 +97,7 @@ in VertexData{
 	vec2 TextureCoordinate;
 	vec4 ExplosionColor;
 	float ExplosionPercentageElapsed;
+	vec4 PositionLightSpace[MAX_SPLITS];
 }Input;
 
 out vec4 sceneColor;

resources/Shaders/ForwardPlusSplatMapRGB.frag.glsl

@@ -1,6 +1,7 @@
 #version 430
 
 #define MIN_AMBIENT_LIGHT 0.3
+#define MAX_SPLITS 4
 
 uniform mat4 M;
 uniform mat4 V;
@@ -83,6 +84,7 @@ in VertexData{
 	vec2 TextureCoordinate;
 	vec4 ExplosionColor;
 	float ExplosionPercentageElapsed;
+	vec4 PositionLightSpace[MAX_SPLITS];
 }Input;
 
 out vec4 sceneColor;

resources/Shaders/Shadow.frag.glsl

@@ -0,0 +1,22 @@
+#version 430
+
+#define ALPHA_CUTOFF 0.3
+
+layout (binding = 24) uniform sampler2D DiffuseTexture;
+uniform float Alpha;
+
+in VertexData{
+	vec2 TextureCoordinate;
+}Input;
+
+layout (location = 0) out float ShadowMap;
+
+void main()
+{
+	vec4 diffuseTexel = texture(DiffuseTexture, Input.TextureCoordinate) * Alpha;
+	
+	if (diffuseTexel.a < ALPHA_CUTOFF)
+	{
+		discard;
+	}
+}

resources/Shaders/Shadow.vert.glsl

@@ -0,0 +1,18 @@
+#version 430
+
+uniform mat4 M;
+uniform mat4 V;
+uniform mat4 P;
+
+layout (location = 0) in vec3 Position;
+layout (location = 4) in vec2 TextureCoords;
+
+out VertexData{
+	vec2 TextureCoordinate;
+}Output;
+
+void main()
+{	
+	gl_Position = P * V * M * vec4(Position, 1.0);
+	Output.TextureCoordinate = TextureCoords;
+}

src/Engine/Rendering/DrawFinalPass.cpp

@@ -1,9 +1,10 @@
 #include "Rendering/DrawFinalPass.h"
-DrawFinalPass::DrawFinalPass(IRenderer* renderer, LightCullingPass* lightCullingPass, CubeMapPass* cubeMapPass, SSAOPass* ssaoPass)
+DrawFinalPass::DrawFinalPass(IRenderer* renderer, LightCullingPass* lightCullingPass, CubeMapPass* cubeMapPass, SSAOPass* ssaoPass, ShadowPass* shadowPass)
 	: m_Renderer(renderer)
 	, m_LightCullingPass(lightCullingPass)
 	, m_CubeMapPass(cubeMapPass)
 	, m_SSAOPass(ssaoPass)
+	, m_ShadowPass(shadowPass)
 {
     //TODO: Make sure that uniforms are not sent into shader if not needed.
     m_ShieldPixelRate = 8;
@@ -343,6 +344,14 @@ void DrawFinalPass::DrawModelRenderQueues(std::list<std::shared_ptr<RenderJob>>&
 	glActiveTexture(GL_TEXTURE0);
 	glBindTexture(GL_TEXTURE_2D, m_SSAOPass->SSAOTexture());
 
+	glActiveTexture(GL_TEXTURE13);
+	if (m_ShadowPass->DepthMap() != NULL) {
+		glBindTexture(GL_TEXTURE_2D_ARRAY, m_ShadowPass->DepthMap());
+	}
+	else {
+		glBindTexture(GL_TEXTURE_2D_ARRAY, m_WhiteTexture->m_Texture);
+	}
+
     for (auto &job : jobs) {
         auto explosionEffectJob = std::dynamic_pointer_cast<ExplosionEffectJob>(job);
         if (explosionEffectJob) {
@@ -1083,6 +1092,10 @@ void DrawFinalPass::BindExplosionUniforms(GLuint shaderHandle, std::shared_ptr<E
     glUniform4fv(glGetUniformLocation(shaderHandle, "AmbientColor"), 1, glm::value_ptr(scene.AmbientColor));
     GLERROR("Bind 20 uniform");
     glUniform1f(glGetUniformLocation(shaderHandle, "GlowIntensity"), job->GlowIntensity);
+
+	glUniformMatrix4fv(glGetUniformLocation(shaderHandle, "LightP"), MAX_SPLITS, GL_FALSE, glm::value_ptr(*m_ShadowPass->LightP().data()));
+	glUniformMatrix4fv(glGetUniformLocation(shaderHandle, "LightV"), MAX_SPLITS, GL_FALSE, glm::value_ptr(*m_ShadowPass->LightV().data()));
+	glUniform1fv(glGetUniformLocation(shaderHandle, "FarDistance"), MAX_SPLITS, m_ShadowPass->FarDistance().data());
     GLERROR("END");
 }
 
@@ -1121,8 +1134,11 @@ void DrawFinalPass::BindModelUniforms(GLuint shaderHandle, std::shared_ptr<Model
 
     GLERROR("Bind 10 uniform");
     GLint Location_GlowIntensity = glGetUniformLocation(shaderHandle, "GlowIntensity");
+	glUniform1f(Location_GlowIntensity, job->GlowIntensity);
 
-    glUniform1f(Location_GlowIntensity, job->GlowIntensity);
+	glUniformMatrix4fv(glGetUniformLocation(shaderHandle, "LightP"), MAX_SPLITS, GL_FALSE, glm::value_ptr(*m_ShadowPass->LightP().data()));
+	glUniformMatrix4fv(glGetUniformLocation(shaderHandle, "LightV"), MAX_SPLITS, GL_FALSE, glm::value_ptr(*m_ShadowPass->LightV().data()));
+	glUniform1fv(glGetUniformLocation(shaderHandle, "FarDistance"), MAX_SPLITS, m_ShadowPass->FarDistance().data());
 
 	GLERROR("END");
 }

src/Engine/Rendering/FrameBuffer.cpp

@@ -53,16 +53,20 @@ void FrameBuffer::Generate()
 		case GL_TEXTURE_2D:
 			glFramebufferTexture2D(GL_FRAMEBUFFER, (*it)->m_Attachment, (*it)->m_ResourceType, *(*it)->m_ResourceHandle, 0);
 			GLERROR("FrameBuffer generate: glFramebufferTexture2D");
-
 			break;
 		case GL_RENDERBUFFER:
 			glFramebufferRenderbuffer(GL_FRAMEBUFFER, (*it)->m_Attachment, (*it)->m_ResourceType, *(*it)->m_ResourceHandle);
 			GLERROR("FrameBuffer generate: glFramebufferRenderbuffer");
 			break;
+		case GL_TEXTURE_2D_ARRAY:
+			glFramebufferTexture(GL_FRAMEBUFFER, (*it)->m_Attachment, *(*it)->m_ResourceHandle, 0);
+			GLERROR("FrameBuffer generate: glFramebufferTexture2DArray");
+			break;
 		}
 		GLERROR("2");
 
-		if ((*it)->m_Attachment != GL_DEPTH_ATTACHMENT && (*it)->m_Attachment != GL_STENCIL_ATTACHMENT && (*it)->m_Attachment != GL_DEPTH_STENCIL_ATTACHMENT) {
+		// Need GL_DEPTH_ATTACHMENT for shadows
+		if (/*(*it)->m_Attachment != GL_DEPTH_ATTACHMENT &&*/ (*it)->m_Attachment != GL_STENCIL_ATTACHMENT && (*it)->m_Attachment != GL_DEPTH_STENCIL_ATTACHMENT) {
 			attachments.push_back((*it)->m_Attachment);
 		}
 		GLERROR("Attachment");

src/Engine/Rendering/Renderer.cpp

@@ -133,6 +133,8 @@ void Renderer::Draw(RenderFrame& frame)
     m_DrawFinalPass->ClearBuffer();
     m_DrawBloomPass->ClearBuffer();
 	m_SSAOPass->ClearBuffer();
+	m_ShadowPass->ClearBuffer();
+	m_ShadowPass->DebugGUI();
     PerformanceTimer::StopTimer("Renderer-ClearBuffers");
     GLERROR("ClearBuffers");
 	for (auto scene : frame.RenderScenes) {
@@ -148,6 +150,9 @@ void Renderer::Draw(RenderFrame& frame)
         PerformanceTimer::StartTimer("Renderer-Depth");
         SortRenderJobsByDepth(*scene);
         GLERROR("SortByDepth");
+		PerformanceTimer::StartTimerAndStopPrevious("Draw shadow maps");
+		m_ShadowPass->Draw(*scene);
+		GLERROR("Draw shadow maps");
         PerformanceTimer::StartTimerAndStopPrevious("Renderer-Generate Frustrums");
         m_LightCullingPass->GenerateNewFrustum(*scene);
         GLERROR("Generate frustums");
@@ -244,7 +249,8 @@ void Renderer::InitializeRenderPasses()
     m_LightCullingPass = new LightCullingPass(this);
     m_CubeMapPass = new CubeMapPass(this);
 	m_SSAOPass = new SSAOPass(this, m_Config);
-    m_DrawFinalPass = new DrawFinalPass(this, m_LightCullingPass, m_CubeMapPass, m_SSAOPass);
+	m_ShadowPass = new ShadowPass(this);
+    m_DrawFinalPass = new DrawFinalPass(this, m_LightCullingPass, m_CubeMapPass, m_SSAOPass, m_ShadowPass);
     m_DrawScreenQuadPass = new DrawScreenQuadPass(this);
     m_DrawBloomPass = new DrawBloomPass(this, m_Config);
     m_DrawColorCorrectionPass = new DrawColorCorrectionPass(this);

src/Engine/Rendering/ShadowPass.cpp

@@ -0,0 +1,305 @@
+#include "Rendering/ShadowPass.h"
+
+ShadowPass::ShadowPass(IRenderer * renderer, int shadow_res_x, int shadow_res_y)
+{
+	m_Renderer = renderer;
+	m_ResolutionSizeWidth = shadow_res_x;
+	m_ResolutionSizeHeight = shadow_res_y;
+
+	InitializeFrameBuffers();
+	InitializeShaderPrograms();
+}
+
+ShadowPass::ShadowPass(IRenderer * renderer)
+{
+	m_Renderer = renderer;
+
+	InitializeFrameBuffers();
+	InitializeShaderPrograms();
+}
+
+ShadowPass::~ShadowPass()
+{
+
+}
+
+void ShadowPass::DebugGUI()
+{
+	ImGui::Checkbox("EnableShadows", &m_EnableShadows);
+	ImGui::DragFloat2("ShadowMapNearFar", m_NearFarPlane, 1.f, -1000.f, 1000.f);
+	ImGui::DragFloat("ShadowClippingWeight", &m_SplitWeight, 0.001f, 0.f, 1.f);
+	ImGui::Checkbox("ShadowTransparentObjects", &m_TransparentObjects);
+	ImGui::Checkbox("ShadowOnTextureAlphas", &m_TexturedShadows);
+}
+
+void ShadowPass::InitializeCameras(RenderScene & scene)
+{
+	for (int i = 0; i < m_CurrentNrOfSplits; i++) {
+		m_shadowFrusta[i].AspectRatio = scene.Camera->AspectRatio();
+		m_shadowFrusta[i].FOV = scene.Camera->FOV();
+	}
+}
+
+// UpdateSplitDist computes the near and far distances for every frustum slice
+// in camera eye space - that is, at what distance does a slice start and end
+void ShadowPass::UpdateSplitDist(std::array<ShadowFrustum, MAX_SPLITS>& frusta, float near_distance, float far_distance)
+{
+	float lambda = m_SplitWeight;
+	float ratio = far_distance / near_distance;
+
+	frusta[0].NearClip = near_distance;
+
+	for (int i = 1; i < m_CurrentNrOfSplits; i++) {
+		float si = i / static_cast<float>(m_CurrentNrOfSplits);
+
+		frusta[i].NearClip = lambda * (near_distance * powf(ratio, si)) + (1 - lambda) * (near_distance + (far_distance - near_distance) * si);
+		frusta[i - 1].FarClip = frusta[i].NearClip * 1.005f;
+	}
+
+	frusta[m_CurrentNrOfSplits - 1].FarClip = far_distance;
+}
+
+void ShadowPass::UpdateFrustumPoints(ShadowFrustum& frustum, glm::mat4 p, glm::mat4 v)
+{
+	std::array<glm::vec4, 8> CornerPoint = {
+		glm::vec4(-1.f, -1.f,	-1.f,	1.f),
+		glm::vec4(-1.f, 1.f,	-1.f,	1.f),
+		glm::vec4(1.f,	1.f,	-1.f,	1.f),
+		glm::vec4(1.f,	-1.f,	-1.f,	1.f),
+		glm::vec4(-1.f,	-1.f,	1.f,	1.f),
+		glm::vec4(-1.f,	1.f,	1.f,	1.f),
+		glm::vec4(1.f,	1.f,	1.f,	1.f),
+		glm::vec4(1.f,	-1.f,	1.f,	1.f)
+	};
+
+	for (int i = 0; i < 8; i++) {
+		glm::vec4 NDC = glm::inverse(p) * CornerPoint[i];
+		NDC = NDC / NDC.w;
+		frustum.CornerPoint[i] = glm::vec3(glm::inverse(v) * NDC);
+	}
+}
+
+// Compute the 8 corner points of the current view frustum in world space
+void ShadowPass::UpdateFrustumPoints(ShadowFrustum& frustum, glm::vec3 camera_position, glm::vec3 view_dir)
+{
+	glm::vec3 up = glm::vec3(0.f, 1.f, 0.f);
+	glm::vec3 right = glm::normalize(glm::cross(view_dir, up));
+
+	glm::vec3 far_center = camera_position + glm::normalize(view_dir) * frustum.FarClip;
+	glm::vec3 near_center = camera_position + glm::normalize(view_dir) * frustum.NearClip;
+	frustum.MiddlePoint = near_center + (far_center - near_center) * 0.5f;
+
+	up = glm::normalize(glm::cross(right, view_dir));
+
+	// these heights and widths are half the heights and widths of the near and far plane rectangles.
+	float near_height = tan(frustum.FOV / 2.f) * frustum.NearClip;
+	float near_width = near_height * frustum.AspectRatio;
+	float far_height = tan(frustum.FOV / 2.f) * frustum.FarClip;
+	float far_width = far_height * frustum.AspectRatio;
+
+	frustum.CornerPoint[0] = near_center - up * near_height - right * near_width;
+	frustum.CornerPoint[1] = near_center + up * near_height - right * near_width;
+	frustum.CornerPoint[2] = near_center + up * near_height + right * near_width;
+	frustum.CornerPoint[3] = near_center - up * near_height + right * near_width;
+
+	frustum.CornerPoint[4] = far_center - up * far_height - right * far_width;
+	frustum.CornerPoint[5] = far_center + up * far_height - right * far_width;
+	frustum.CornerPoint[6] = far_center + up * far_height + right * far_width;
+	frustum.CornerPoint[7] = far_center - up * far_height + right * far_width;
+}
+
+float ShadowPass::FindRadius(ShadowFrustum& frustum)
+{
+	float radius = 0.f;
+
+	for (int i = 0; i < 8; i++) {
+		float distance = glm::distance(frustum.MiddlePoint, frustum.CornerPoint[i]);
+		if (distance > radius) {
+			radius = distance;
+		}
+	}
+
+	frustum.Radius = radius;
+	return radius;
+}
+
+void ShadowPass::InitializeFrameBuffers()
+{
+	// Depth texture
+	glGenTextures(1, &m_DepthMap);
+
+	glBindTexture(GL_TEXTURE_2D_ARRAY, m_DepthMap);
+	glTexStorage3D(GL_TEXTURE_2D_ARRAY, 1, GL_DEPTH_COMPONENT16, m_ResolutionSizeWidth, m_ResolutionSizeHeight, m_CurrentNrOfSplits);
+
+	glTexSubImage3D(GL_TEXTURE_2D_ARRAY, 0, 0, 0, 0, m_ResolutionSizeWidth, m_ResolutionSizeHeight, m_CurrentNrOfSplits, GL_DEPTH_COMPONENT, GL_UNSIGNED_INT, nullptr);
+
+	glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+	glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+	glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_BORDER);
+	glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_BORDER);
+	glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_COMPARE_MODE, GL_COMPARE_R_TO_TEXTURE);
+	glTexParameterfv(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_BORDER_COLOR, glm::vec4(1.f).data);
+	glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_COMPARE_FUNC, GL_LEQUAL);
+
+	m_DepthBuffer.AddResource(std::shared_ptr<BufferResource>(new Texture2D(&m_DepthMap, GL_DEPTH_ATTACHMENT)));
+	m_DepthBuffer.Generate();
+
+	GLERROR("depthMap failed END");
+}
+
+void ShadowPass::InitializeShaderPrograms()
+{
+	m_ShadowProgram = ResourceManager::Load<ShaderProgram>("#ShadowProgram");
+	m_ShadowProgram->AddShader(std::shared_ptr<Shader>(new VertexShader("Shaders/Shadow.vert.glsl")));
+	m_ShadowProgram->AddShader(std::shared_ptr<Shader>(new FragmentShader("Shaders/Shadow.frag.glsl")));
+	m_ShadowProgram->Compile();
+	m_ShadowProgram->BindFragDataLocation(0, "ShadowMap");
+	m_ShadowProgram->Link();
+
+
+}
+
+void ShadowPass::ClearBuffer()
+{
+	m_DepthBuffer.Bind();
+
+	for (int i = 0; i < m_CurrentNrOfSplits; i++) {
+		glFramebufferTextureLayer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, m_DepthMap, 0, i);
+
+		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+	}
+
+	m_DepthBuffer.Unbind();
+}
+
+void ShadowPass::PointsToLightspace(ShadowFrustum& frustum, glm::mat4 v)
+{
+	float left = INFINITY;
+	float right = -INFINITY;
+	float bottom = INFINITY;
+	float top = -INFINITY;
+
+	for (int i = 0; i < 8; i++)
+	{
+		glm::vec3 tempPoint = glm::vec3(v * glm::vec4(frustum.CornerPoint[i], 1.f));
+
+		if (tempPoint.x < left) { left = tempPoint.x; }
+		if (tempPoint.x > right) { right = tempPoint.x; }
+		if (tempPoint.y < bottom) { bottom = tempPoint.y; }
+		if (tempPoint.y > top) { top = tempPoint.y; }
+	}
+
+	frustum.LRBT = { left, right, bottom, top };
+}
+
+void ShadowPass::RadiusToLightspace(ShadowFrustum& frustum)
+{
+	float quantizationStep = 1.0f / m_ResolutionSizeHeight;
+
+	float left = -frustum.Radius;
+	float right = frustum.Radius;
+	float bottom = -frustum.Radius;
+	float top = frustum.Radius;
+
+	frustum.LRBT = { left, right, bottom, top };
+}
+
+void ShadowPass::Draw(RenderScene & scene)
+{
+	if (m_EnableShadows) {
+		InitializeCameras(scene);
+		UpdateSplitDist(m_shadowFrusta, scene.Camera->NearClip(), scene.Camera->FarClip());
+
+		ShadowPassState* state = new ShadowPassState(m_DepthBuffer.GetHandle());
+
+		m_ShadowProgram->Bind();
+		GLuint shaderHandle = m_ShadowProgram->GetHandle();
+		glViewport(0, 0, m_ResolutionSizeWidth, m_ResolutionSizeHeight);
+
+		for (int i = 0; i < m_CurrentNrOfSplits; i++) {
+			UpdateFrustumPoints(m_shadowFrusta[i], scene.Camera->Position(), scene.Camera->Forward());
+
+			glFramebufferTextureLayer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, m_DepthMap, 0, i);
+
+			for (auto &job : scene.Jobs.DirectionalLight) {
+				auto directionalLightJob = std::dynamic_pointer_cast<DirectionalLightJob>(job);
+
+				if (directionalLightJob) {
+					m_LightView[i] = glm::lookAt(glm::vec3(-directionalLightJob->Direction) + m_shadowFrusta[i].MiddlePoint, m_shadowFrusta[i].MiddlePoint, glm::vec3(0.f, 1.f, 0.f));
+
+					PointsToLightspace(m_shadowFrusta[i], m_LightView[i]);
+					//FindRadius(m_shadowFrusta[i]);
+					//RadiusToLightspace(m_shadowFrusta[i]);
+					m_LightProjection[i] = glm::ortho(m_shadowFrusta[i].LRBT[LEFT], m_shadowFrusta[i].LRBT[RIGHT], m_shadowFrusta[i].LRBT[BOTTOM], m_shadowFrusta[i].LRBT[TOP], m_NearFarPlane[NEAR], m_NearFarPlane[FAR]);
+
+					glUniformMatrix4fv(glGetUniformLocation(shaderHandle, "P"), 1, GL_FALSE, glm::value_ptr(m_LightProjection[i]));
+					glUniformMatrix4fv(glGetUniformLocation(shaderHandle, "V"), 1, GL_FALSE, glm::value_ptr(m_LightView[i]));
+
+					GLERROR("ShadowLight ERROR");
+
+					for (auto &objectJob : scene.Jobs.OpaqueObjects) {
+						if (!std::dynamic_pointer_cast<ExplosionEffectJob>(objectJob)) {
+							auto modelJob = std::dynamic_pointer_cast<ModelJob>(objectJob);
+
+							glUniformMatrix4fv(glGetUniformLocation(shaderHandle, "M"), 1, GL_FALSE, glm::value_ptr(modelJob->Matrix));
+							glUniform1f(glGetUniformLocation(shaderHandle, "Alpha"), 1.f);
+
+							glBindVertexArray(modelJob->Model->VAO);
+							glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, modelJob->Model->ElementBuffer);
+							glDrawElements(GL_TRIANGLES, modelJob->EndIndex - modelJob->StartIndex + 1, GL_UNSIGNED_INT, (void*)(modelJob->StartIndex * sizeof(unsigned int)));
+
+							GLERROR("Shadow Draw ERROR");
+						}
+					}
+					if (m_TransparentObjects) {
+						state->CullFace(GL_BACK);
+						for (auto &objectJob : scene.Jobs.TransparentObjects) {
+							if (!std::dynamic_pointer_cast<ExplosionEffectJob>(objectJob)) {
+								auto modelJob = std::dynamic_pointer_cast<ModelJob>(objectJob);
+
+								glUniformMatrix4fv(glGetUniformLocation(shaderHandle, "M"), 1, GL_FALSE, glm::value_ptr(modelJob->Matrix));
+								glUniform1f(glGetUniformLocation(shaderHandle, "Alpha"), modelJob->Color.a);
+
+								if (m_TexturedShadows) {
+									switch (modelJob->Type) {
+									case RawModel::MaterialType::SingleTextures:
+									case RawModel::MaterialType::Basic:
+									{
+										glActiveTexture(GL_TEXTURE24);
+										if (modelJob->DiffuseTexture.size() > 0 && modelJob->DiffuseTexture[0]->Texture != nullptr) {
+											glBindTexture(GL_TEXTURE_2D, modelJob->DiffuseTexture[0]->Texture->m_Texture);
+											glUniform2fv(glGetUniformLocation(shaderHandle, "DiffuseUVRepeat"), 1, glm::value_ptr(modelJob->DiffuseTexture[0]->UVRepeat));
+										}
+										else {
+											glBindTexture(GL_TEXTURE_2D, m_WhiteTexture->m_Texture);
+											glUniform2fv(glGetUniformLocation(shaderHandle, "DiffuseUVRepeat"), 1, glm::value_ptr(glm::vec2(1.0f, 1.0f)));
+										}
+										break;
+									}
+									case RawModel::MaterialType::SplatMapping:
+									{
+										glActiveTexture(GL_TEXTURE24);
+										glBindTexture(GL_TEXTURE_2D, m_WhiteTexture->m_Texture);
+										glUniform2fv(glGetUniformLocation(shaderHandle, "DiffuseUVRepeat"), 1, glm::value_ptr(glm::vec2(1.0f, 1.0f)));
+										break;
+									}
+									}
+								}
+
+								glBindVertexArray(modelJob->Model->VAO);
+								glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, modelJob->Model->ElementBuffer);
+								glDrawElements(GL_TRIANGLES, modelJob->EndIndex - modelJob->StartIndex + 1, GL_UNSIGNED_INT, (void*)(modelJob->StartIndex * sizeof(unsigned int)));
+
+								GLERROR("Shadow Draw ERROR");
+							}
+						}
+						state->CullFace(GL_FRONT);
+					}
+				}
+			}
+		}
+		glViewport(0, 0, m_Renderer->GetViewportSize().Width, m_Renderer->GetViewportSize().Height);
+		m_DepthBuffer.Unbind();
+		delete state;
+	}
+}

src/Engine/Rendering/ShadowPassState.cpp

@@ -0,0 +1,19 @@
+#include "Rendering/ShadowPassState.h"
+
+ShadowPassState::ShadowPassState(GLuint frameBuffer)
+{
+	BindFramebuffer(frameBuffer);
+	Enable(GL_DEPTH_TEST);
+	Enable(GL_CULL_FACE);
+	Disable(GL_BLEND);
+	Disable(GL_TEXTURE_2D);
+	CullFace(GL_FRONT);
+	ClearColor(glm::vec4(0.f, 0.f, 0.f, 0.f));
+	//Enable(GL_ALPHA_TEST);
+	//glAlphaFunc(GL_GREATER, 0.9f);
+}
+
+ShadowPassState::~ShadowPassState()
+{
+
+}