Added velocity buffer + start of TAA implementation

Resources/Shaders/gbuffer.shader

@@ -10,6 +10,8 @@ layout(location = 4) in vec3 Bitangent;
 uniform mat4 u_Model;
 uniform mat4 u_View;
 uniform mat4 u_Projection;
+uniform mat4 u_PreviousViewModel;
+uniform vec2 u_Jitter;
 
 out vec4 FragPos;
 out mat3 TBN;
@@ -18,6 +20,7 @@ out mat4 Inv_Proj;
 out mat4 Inv_View;
 out mat4 view;
 out vec3 o_Tangent;
+out vec4 PreviousFragPos;
 
 void main()
 {
@@ -37,8 +40,11 @@ void main()
     Inv_View = u_View;
     o_Tangent = Tangent;
 
-    gl_Position = u_Projection * u_View * u_Model * vec4(VertexPosition, 1.0f);
-    FragPos = gl_Position;
+    vec4 clipPosition = u_Projection * u_View * u_Model * vec4(VertexPosition, 1.0f);
+    FragPos = clipPosition;
+
+    gl_Position = clipPosition;
+    PreviousFragPos = u_PreviousViewModel * vec4(VertexPosition, 1.0f);
 }
 
 #shader fragment
@@ -49,14 +55,14 @@ layout(location = 1) out vec4 gNormal;
 layout(location = 2) out vec4 gMaterial;
 layout(location = 3) out int gEntityID;
 layout(location = 4) out float gEmissive;
-layout(location = 5) out vec4 gTexelOffset;
+layout(location = 5) out vec4 gVelocity;
 
 in vec4 FragPos;
 in vec2 UV;
 in mat3 TBN;
 in mat4 Inv_Proj;
 in mat4 Inv_View;
-
+in vec4 PreviousFragPos;
 
 // Material
 uniform sampler2D m_Albedo;
@@ -143,27 +149,8 @@ void main()
     gMaterial.b = finalRoughness;
 
     gEntityID = int(u_EntityID);
-
     gEmissive = u_Emissive;
 
-    vec3 right = vec3(1.0, 0, 0);
-    right = TBN * normalize(right);
-    vec3 up = TBN * normalize(vec3(0, 1, 0));
-
-    vec2 textureSize2d = textureSize(m_Albedo, 0);
-    vec2 pixelPos = UV * textureSize2d;
-    vec2 centerOfPixel = (vec2(0.5) + floor(pixelPos));
-    vec2 uvCenter = centerOfPixel;
-
-    vec3 uvDiff = vec3(uvCenter.x - pixelPos.x, uvCenter.y - pixelPos.y, 0.0f) / vec3(textureSize2d.x, textureSize2d.y, 1.0f);
-
-    uvDiff = uvDiff.x * right;
-    uvDiff = uvDiff.y * up;
-    //uvDiff * right;
-    uvDiff = uvDiff * 100.0f;
-    vec2 offset = (centerOfPixel - vec2(FragPos.x, FragPos.y)) * 10.0f;
-
-    vec3 finalTransformed =  normalize(uvDiff);
-    vec4 conversion = Inv_Proj * Inv_View * vec4(finalTransformed, 1.0f);
-    gTexelOffset = vec4(conversion.x / 2.0 + 0.5f, conversion.y / 2.0 + 0.5f, 0, 1);
+    vec4 positionDifference = FragPos - PreviousFragPos;
+    gVelocity = vec4((positionDifference.x + 1.0) / 2.0, (positionDifference.y + 1.0) / 2.0, 0.0f, 1);
 }