add simple render, add simple pbr shader(from hazel)

Sandbox/Sandbox/Layer/DemoLayer.h

@@ -6,6 +6,9 @@
 #define DEMOLAYER_H
 
 #include "Prism.h"
+#include "Prism/Renderer/Camera.h"
+#include "Prism/Renderer/FrameBuffer.h"
+#include "Prism/Renderer/Mesh.h"
 
 class DemoLayer : public Prism::Layer
 {
@@ -20,12 +23,80 @@ public:
     virtual void OnEvent(Prism::Event& e) override;
 
 private:
-    float m_ClearColor[4] = { 0.2f, 0.2f, 0.2f, 1.0f };
-    glm::vec4 m_TriangleColor = { 0.4f, 0.5f, 0.6f, 1.0f };
+    float m_ClearColor[4];
+
+	std::unique_ptr<Prism::Shader> m_Shader;
+    std::unique_ptr<Prism::Shader> m_PBRShader;
+    std::unique_ptr<Prism::Shader> m_SimplePBRShader;
+    std::unique_ptr<Prism::Shader> m_QuadShader;
+    std::unique_ptr<Prism::Shader> m_HDRShader;
+    std::unique_ptr<Prism::Mesh> m_Mesh;
+    std::unique_ptr<Prism::Mesh> m_SphereMesh;
+    std::unique_ptr<Prism::Texture2D> m_BRDFLUT;
+
+    struct AlbedoInput
+    {
+        glm::vec3 Color = { 0.972f, 0.96f, 0.915f }; // Silver, from https://docs.unrealengine.com/en-us/Engine/Rendering/Materials/PhysicallyBased
+        std::unique_ptr<Prism::Texture2D> TextureMap;
+        bool SRGB = true;
+        bool UseTexture = false;
+    };
+    AlbedoInput m_AlbedoInput;
+
+    struct NormalInput
+    {
+        std::unique_ptr<Prism::Texture2D> TextureMap;
+        bool UseTexture = false;
+    };
+    NormalInput m_NormalInput;
+
+    struct MetalnessInput
+    {
+        float Value = 1.0f;
+        std::unique_ptr<Prism::Texture2D> TextureMap;
+        bool UseTexture = false;
+    };
+    MetalnessInput m_MetalnessInput;
+
+    struct RoughnessInput
+    {
+        float Value = 0.5f;
+        std::unique_ptr<Prism::Texture2D> TextureMap;
+        bool UseTexture = false;
+    };
+    RoughnessInput m_RoughnessInput;
+
+    std::unique_ptr<Prism::FrameBuffer> m_Framebuffer, m_FinalPresentBuffer;
 
     std::unique_ptr<Prism::VertexBuffer> m_VertexBuffer;
     std::unique_ptr<Prism::IndexBuffer> m_IndexBuffer;
-    std::unique_ptr<Prism::Shader> m_Shader;
+    std::unique_ptr<Prism::TextureCube> m_EnvironmentCubeMap, m_EnvironmentIrradiance;
+
+    Prism::Camera m_Camera;
+
+    struct Light
+    {
+        glm::vec3 Direction;
+        glm::vec3 Radiance;
+    };
+    Light m_Light;
+    float m_LightMultiplier = 0.3f;
+
+    // PBR params
+    float m_Exposure = 1.0f;
+
+    bool m_RadiancePrefilter = false;
+
+    float m_EnvMapRotation = 0.0f;
+
+    enum class Scene : uint32_t
+    {
+        Spheres = 0, Model = 1
+    };
+    Scene m_Scene;
+
+    // Editor resources
+    std::unique_ptr<Prism::Texture2D> m_CheckerboardTex;
 };