MipMap is working. But no gain :C

resources/Shaders/SSAO.frag.glsl

@@ -99,12 +99,14 @@ void main() {
 		radius = uRadius;
 	}
 
+
 	float radius2 = radius * radius;
 
 	vec3 originNormal = getVSFaceNormal(origin);
 
 	//screenSpaceSampleRadius is in pixels
-	float screenSpaceSampleRadius = uProjScale * radius / origin.z;
+	float screenSpaceSampleRadius = -uProjScale * radius / origin.z;
+	//screenSpaceSampleRadius = clamp(screenSpaceSampleRadius, 0.0f, -uProjScale * radius);
 
 	float rotationAngleOffset = 30 * originScreenCoord.x ^ originScreenCoord.y + 10 * originScreenCoord.x * originScreenCoord.y;
 
@@ -116,5 +118,6 @@ void main() {
     //float A = max(0.0, 1.0 - sum * (2.0f / uNumOfSamples));
     float A = 1.0f - sum * (2.0f * uIntensityScale / float(uNumOfSamples));
     AO = clamp(pow(A, uContrast), 0.0f, 1.0f);
+    //AO = screenSpaceSampleRadius;
 	//AO = vec4(originNormal, 1.0f);
 }

resources/Shaders/SSAOMipMappedZ.frag.glsl

@@ -1,8 +1,8 @@
 #version 430
 
-#define MIP_MAPS_LEVELS (3)
+#define MIP_MAPS_LEVELS (5)
 
-#define MAX_PIXEL_BEFOR_LOWER_MIP_LEVEL (3)
+#define LOWER_MIP_LEVEL (2)
 //Number of samples per pixel
 uniform int           uNumOfSamples;
 //#define uNumOfSamples (11)
@@ -32,7 +32,7 @@ uniform float           uIntensityScale;
 out float				AO;
 
 vec3 getVSPosition(ivec2 ScreenSpaceCoord, int mipmaplevel) {
-    float z = texelFetch(ViewSpaceZ, ScreenSpaceCoord, 0).r;
+    float z = texelFetch(ViewSpaceZ, ScreenSpaceCoord, mipmaplevel).r;
     //Get the xy view space coordinates and add the z value from ViewSpaceZ buffer.
     return vec3((uProjInfo[0] + (ScreenSpaceCoord.x * uProjInfo[1])) * z, (uProjInfo[2] + (ScreenSpaceCoord.y * uProjInfo[3])) * z, z);
 }
@@ -56,8 +56,7 @@ vec3 getSampleViewSpacePos(ivec2 ScreenSpaceCoord, int SampleIndex, float Rotati
 
     vec2 screenSpaceSampleOffsetVecor = vec2(cos(angle), sin(angle));
 
-    int mipmapLevel = clamp(int(floor(log2(-ScreenSpaceSampleRadius))) - MAX_PIXEL_BEFOR_LOWER_MIP_LEVEL, 0, MIP_MAPS_LEVELS);
-
+    int mipmapLevel = clamp(int(floor(log2(-ScreenSpaceSampleRadius))) - LOWER_MIP_LEVEL, 0, MIP_MAPS_LEVELS);
     // Get texel coordinate on where to sample by going screenSpaceSampleOffsetVecor direction in ScreenSpaceSampleRadius units from ScreenSpaceCoord (the point being shaded);
     ivec2 screenSpaceSampleTexel = (ivec2(ScreenSpaceSampleRadius * screenSpaceSampleOffsetVecor) + ScreenSpaceCoord) >> mipmapLevel;
 
@@ -80,8 +79,6 @@ float sampleAO(ivec2 ScreenSpaceCoord, vec3 Origin, vec3 OriginNormal, float Scr
 	// vn - bias, offset the angle to reduse self occlusion. 
 	// epsilon is here to make divison by 0 impossible.
 	return float(vv < Radius2) * max((vn - uBias) / (epsilon + vv), 0.0);
-	//float f = max(radius2 - vv, 0.0); 
-	//return f * f * f * max((vn - uBias) / (epsilon + vv), 0.0);
 }
 
 
@@ -102,9 +99,15 @@ void main() {
 	float radius2 = radius * radius;
 
 	vec3 originNormal = getVSFaceNormal(origin);
+	//AO = originNormal;
+	//return;
 
 	//screenSpaceSampleRadius is in pixels
-	float screenSpaceSampleRadius = uProjScale * radius / origin.z;
+	float screenSpaceSampleRadius = -uProjScale * radius / origin.z;
+
+	//screenSpaceSampleRadius = clamp(screenSpaceSampleRadius, 0.0f, pow(2, MIP_MAPS_LEVELS * LOWER_MIP_LEVEL + 1));
+	//AO = clamp(int(floor(log2(screenSpaceSampleRadius))) - LOWER_MIP_LEVEL, 0, MIP_MAPS_LEVELS);
+	//return;
 
 	float rotationAngleOffset = 30 * originScreenCoord.x ^ originScreenCoord.y + 10 * originScreenCoord.x * originScreenCoord.y;
 

src/Engine/Rendering/SSAOPass.cpp

@@ -38,6 +38,8 @@ void SSAOPass::InitializeBuffer()
 	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 	glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, m_Renderer->GetViewportSize().Width, m_Renderer->GetViewportSize().Height, 0, GL_RED, GL_FLOAT, nullptr);
+	//glTexImage2D(GL_TEXTURE_2D, 0, GL_R32I, m_Renderer->GetViewportSize().Width, m_Renderer->GetViewportSize().Height, 0, GL_RED_INTEGER, GL_INT, nullptr);
+	//glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB32F, m_Renderer->GetViewportSize().Width, m_Renderer->GetViewportSize().Height, 0, GL_RGB, GL_FLOAT, nullptr);
 
 	m_SSAOFramBuffer.AddResource(std::shared_ptr<BufferResource>(new Texture2D(&m_SSAOTexture, GL_COLOR_ATTACHMENT0)));
 	m_SSAOFramBuffer.Generate();
@@ -129,7 +131,7 @@ void SSAOPass::Draw(GLuint depthBuffer, Camera* camera)
 	glBindTexture(GL_TEXTURE_2D, m_SSAOViewSpaceZTexture);
 
 	// How many pixel there are in a 1m long object 1m away from the camera
-	glUniform1f(glGetUniformLocation(SSAOShaderHandle, "uProjScale"), m_Renderer->GetViewportSize().Height / (2.0f * glm::tan(glm::radians(camera->FOV() * 0.5f))));
+	glUniform1f(glGetUniformLocation(SSAOShaderHandle, "uProjScale"), m_Renderer->GetViewportSize().Height / (-2.0f * glm::tan(glm::radians(camera->FOV()) * 0.5f)));
 
 	glUniform1f(glGetUniformLocation(SSAOShaderHandle, "uRadius"), m_Radius);
 	glUniform1f(glGetUniformLocation(SSAOShaderHandle, "uBias"), m_Bias);
@@ -145,7 +147,3 @@ void SSAOPass::Draw(GLuint depthBuffer, Camera* camera)
 	m_DrawBloomPass->ClearBuffer();
 	m_DrawBloomPass->Draw(m_SSAOTexture);
 }
-
-void ComputeAO(GLuint depthBuffer, Camera* camera) {
-
-}