Shadow WIP stage 2

-  Soft shadow

include/Engine/Rendering/ShadowPass.h

@@ -32,8 +32,8 @@ public:
     glm::mat4 lightSpaceMatrix() const { return m_LightSpaceMatrix; }
     glm::mat4 lightP() const { return m_LightProjection; }
     glm::mat4 lightV() const { return m_LightView; }
-    //glm::mat4 lightV() const { return m_LightProjection; } //swapped m_P -> m_V
-    //glm::mat4 lightP() const { return m_LightView; } // swapped m_V -> m_P
+
+    void setResolution(GLuint width, GLuint height) { resolutionSizeWidth = width; resolutionSizeHeigth = height; }
 
 private:
 
@@ -57,6 +57,10 @@ private:
     glm::mat4 m_LightProjection;
     glm::mat4 m_LightView;
     glm::mat4 m_LightSpaceMatrix;
+
+    GLuint resolutionSizeWidth = 2048;
+    GLuint resolutionSizeHeigth = 2048;
+
 };
 
 #endif

resources/Shaders/ForwardPlus.frag.glsl

@@ -114,6 +114,13 @@ vec4 CalcNormalMappedValue(vec3 normal, vec3 tangent, vec3 bitangent, vec2 textu
 	return vec4(TBN * normalize(NormalMap), 0.0);
 }
 
+vec2 poissonDisk[4] = vec2[](
+   vec2( -0.94201624, -0.39906216 ),
+   vec2( 0.94558609, -0.76890725 ),
+   vec2( -0.094184101, -0.92938870 ),
+   vec2( 0.34495938, 0.29387760 )
+ );
+
 float CalcShadowValue(vec4 positionLightSpace, vec4 normal, vec4 lightDir, sampler2D depthTexture)
 {
 	
@@ -129,9 +136,22 @@ float CalcShadowValue(vec4 positionLightSpace, vec4 normal, vec4 lightDir, sampl
 	//float currentDepth = positionLightSpace.z;
     float currentDepth = projCoords.z;
     // Check whether current frag pos is in shadow
-	float shadow = currentDepth /*- bias*/ > closestDepth ? 1.0 : 0.0;
+	//float shadow = currentDepth - bias > closestDepth ? 1.0 : 0.0;
    // float shadow = currentDepth > closestDepth ? 1.0 : 0.0;
    
+   float shadow = 0.0;
+   //soft shadow - using percentage-closer filtering (PCF) is to simply sample the surrounding texels of the depth map and average the results:
+   vec2 texelSize = 1.0 / textureSize(depthTexture, 0);
+	for(int x = -1; x <= 1; ++x)
+	{
+		for(int y = -1; y <= 1; ++y)
+		{
+			float pcfDepth = texture(depthTexture, projCoords.xy + vec2(x, y) * texelSize).r; 
+			shadow += currentDepth - bias > pcfDepth ? 1.0 : 0.0;        
+		}    
+	}
+	shadow /= 9.0;
+
     return shadow;
 	
 } 

src/Engine/Rendering/ShadowPass.cpp

@@ -25,7 +25,7 @@ void ShadowPass::InitializeFrameBuffers()
     // Depth texture
     glGenTextures(1, &m_DepthMap);
     glBindTexture(GL_TEXTURE_2D, m_DepthMap);
-    glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT, m_Renderer->GetViewportSize().Width, m_Renderer->GetViewportSize().Height, 0, GL_DEPTH_COMPONENT, GL_FLOAT, nullptr);
+    glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT, resolutionSizeWidth, resolutionSizeHeigth, 0, GL_DEPTH_COMPONENT, GL_FLOAT, nullptr);
     //glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB16F, m_Renderer->GetViewportSize().Width, m_Renderer->GetViewportSize().Height, 0, GL_RGB, GL_FLOAT, 0);
     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
@@ -65,9 +65,9 @@ void ShadowPass::Draw(RenderScene & scene)
     GLuint shaderHandle = m_ShadowProgram->GetHandle();
     m_ShadowProgram->Bind();
 
-    //if (scene.ClearDepth) {
-    //    glClear(GL_COLOR_BUFFER_BIT);
-    //}
+    glViewport(0, 0, resolutionSizeWidth, resolutionSizeHeigth);
+    glCullFace(GL_FRONT);
+
 
     ImGui::DragFloat4("ShadowMapCam", m_LRBT, 1.f, -1000.f, 1000.f);
     ImGui::DragFloat2("ShadowMapNearFar", m_NearFarPlane, 1.f, -1000.f, 1000.f);
@@ -111,8 +111,9 @@ void ShadowPass::Draw(RenderScene & scene)
 
 
 
-
-    //m_ShadowProgram->Unbind();
+    glViewport(0, 0, m_Renderer->GetViewportSize().Width, m_Renderer->GetViewportSize().Height);
+    glCullFace(GL_BACK);
+    m_ShadowProgram->Unbind();