[add]: frame exporting

3 files changed, 91 insertions, 0 deletions

diff --git a/src/Rendering/Framebuffer.cpp b/src/Rendering/Framebuffer.cpp
new file mode 100644
index 0000000..1e95c6d
--- /dev/null
+++ b/src/Rendering/Framebuffer.cpp
@@ -0,0 +1,17 @@
+#include "Framebuffer.h"
+#include "Renderer.h"
+
+#include "Platform/OpenGL/OpenGLFramebuffer.h"
+
+namespace Donut
+{
+    Ref<Framebuffer> Framebuffer::Create(const FramebufferSpecification& spec)
+    {
+        switch (Renderer::GetAPI())
+        {
+            case RendererAPI::API::OpenGL:  return CreateRef<OpenGLFramebuffer>(spec);
+        }
+
+        return nullptr;
+    }
+};
diff --git a/src/Rendering/Framebuffer.h b/src/Rendering/Framebuffer.h
new file mode 100644
index 0000000..e4c1481
--- /dev/null
+++ b/src/Rendering/Framebuffer.h
@@ -0,0 +1,65 @@
+#pragma once
+
+#include "Core/Memory.h"
+#include "Texture.h"
+
+namespace Donut
+{
+    enum class FramebufferTextureFormat
+    {
+        None = 0,
+        
+        RGBA8,
+        RED_INTEGER,
+        
+        DEPTH24STENCIL8,
+        
+        Depth = DEPTH24STENCIL8
+    };
+
+    struct FramebufferTextureSpecification
+    {
+        FramebufferTextureSpecification() = default;
+        FramebufferTextureSpecification(FramebufferTextureFormat format)
+            : TextureFormat(format) {}
+
+        FramebufferTextureFormat TextureFormat = FramebufferTextureFormat::None;
+    };
+
+    struct FramebufferAttachmentSpecification
+    {
+        FramebufferAttachmentSpecification() = default;
+        FramebufferAttachmentSpecification(std::initializer_list<FramebufferTextureSpecification> attachments)
+            : Attachments(attachments) {}
+
+        std::vector<FramebufferTextureSpecification> Attachments;
+    };
+
+    struct FramebufferSpecification
+    {
+        uint32_t Width = 0, Height = 0;
+        FramebufferAttachmentSpecification Attachments;
+        uint32_t Samples = 1;
+
+        bool SwapChainTarget = false;
+    };
+
+    class Framebuffer
+    {
+    public:
+        virtual ~Framebuffer() = default;
+
+        virtual void Bind()   = 0;
+        virtual void Unbind() = 0;
+
+        virtual void Resize(uint32_t width, uint32_t height)           = 0;
+        virtual int  ReadPixel(uint32_t attachmentIndex, int x, int y) = 0;
+
+        virtual void ClearAttachment(uint32_t attachmentIndex, int value)       = 0;
+        virtual uint32_t GetColorAttachmentRendererID(uint32_t index = 0) const = 0;
+
+        virtual const FramebufferSpecification& GetSpecification() const = 0;
+
+        static Ref<Framebuffer> Create(const FramebufferSpecification& spec);
+    };
+};
diff --git a/src/Rendering/Renderer.h b/src/Rendering/Renderer.h
index d6c4154..6e87411 100644
--- a/src/Rendering/Renderer.h
+++ b/src/Rendering/Renderer.h
@@ -3,6 +3,7 @@
 #include "Core/Memory.h"
 #include "VertexArray.h"
 #include "Shader.h"
+#include "Framebuffer.h"
 
 #include <glm/glm.hpp>
 
@@ -41,6 +42,8 @@ namespace Donut
         virtual void BindImageTexture(uint32_t textureID, 
                                       uint32_t slot = 0, 
                                       bool readOnly = false)              = 0;
+        virtual void ReadPixels(uint32_t x, uint32_t y, uint32_t width, uint32_t height, 
+                                uint32_t format, uint32_t type, void* pixels) = 0;
 
         inline static API GetAPI()         { return s_API; }
         inline static void SetAPI(API api) { s_API = api;  }
@@ -122,6 +125,12 @@ namespace Donut
             s_RendererAPI->BindImageTexture(textureID, slot, readOnly);
         }
 
+        inline static void ReadPixels(uint32_t x, uint32_t y, uint32_t width, uint32_t height, 
+                                      uint32_t format, uint32_t type, void* pixels)
+        {
+            s_RendererAPI->ReadPixels(x, y, width, height, format, type, pixels);
+        }
+
     private:
         static Scope<RendererAPI> s_RendererAPI;
     };