[Feat] (MG_State/RenderBufferState): Initially implement RenderbufferState.

CMakeLists.txt

@@ -188,6 +188,8 @@ set(SOURCE_FILES
     MobileGL/MG_State/GLState/FramebufferState/FramebufferState.cpp
     MobileGL/MG_State/GLState/SamplerState/SamplerObject.cpp
     MobileGL/MG_State/GLState/SamplerState/SamplerState.cpp
+    MobileGL/MG_State/GLState/RenderbufferState/RenderbufferObject.cpp
+    MobileGL/MG_State/GLState/RenderbufferState/RenderbufferState.cpp
 )
 
 add_library(${CMAKE_PROJECT_NAME} SHARED 

MobileGL/MG_State/GLState/RenderbufferState/RenderbufferObject.cpp

@@ -0,0 +1,32 @@
+#include "RenderbufferObject.h"
+
+namespace MobileGL {
+    namespace MG_State {
+        namespace GLState {
+            RenderbufferObject::RenderbufferObject(Uint externalIndex) : m_externalIndex(externalIndex) {}
+
+            void RenderbufferObject::Storage(Int internalFormat, Int width, Int height) {
+                m_internalFormat = internalFormat;
+                m_width = width;
+                m_height = height;
+                m_allocated = true;
+            }
+
+            Int RenderbufferObject::GetWidth() const {
+                return m_width;
+            }
+
+            Int RenderbufferObject::GetHeight() const {
+                return m_height;
+            }
+
+            Int RenderbufferObject::GetInternalFormat() const {
+                return m_internalFormat;
+            }
+
+            Bool RenderbufferObject::IsAllocated() const {
+                return m_allocated;
+            }
+        } // namespace GLState
+    } // namespace MG_State
+} // namespace MobileGL

MobileGL/MG_State/GLState/RenderbufferState/RenderbufferObject.h

@@ -0,0 +1,34 @@
+#pragma once
+#include <Includes.h>
+
+namespace MobileGL {
+    enum class RenderbufferTarget { // fucky stuff in GL spec
+        Renderbuffer,
+        RenderbufferTargetCount,
+        Unknown = -1
+    };
+
+    namespace MG_State {
+        namespace GLState {
+            class RenderbufferObject {
+            public:
+                using TargetEnum = RenderbufferTarget;
+
+                RenderbufferObject(Uint externalIndex);
+
+                void Storage(Int internalFormat, Int width, Int height);
+                Int GetWidth() const;
+                Int GetHeight() const;
+                Int GetInternalFormat() const;
+                Bool IsAllocated() const;
+
+            private:
+                Uint m_externalIndex = 0;
+                Int m_internalFormat = 0;
+                Int m_width = 0;
+                Int m_height = 0;
+                Bool m_allocated = false;
+            };
+        } // namespace GLState
+    } // namespace MG_State
+} // namespace MobileGL

MobileGL/MG_State/GLState/RenderbufferState/RenderbufferState.cpp

@@ -0,0 +1,66 @@
+#include "RenderbufferState.h"
+
+namespace MobileGL {
+    namespace MG_State {
+        namespace GLState {
+            RenderbufferState::RenderbufferState() : m_indexGenerator(1024, 1) {
+                for (SizeT i = 0; i < m_bindingSlots.size(); ++i) {
+                    m_bindingSlots[i] = BindingSlot<RenderbufferObject>(static_cast<RenderbufferTarget>(i));
+                }
+            }
+
+            SharedPtr<RenderbufferObject> RenderbufferState::GetRenderbufferObject(Uint index) {
+                auto it = m_renderbufferObjects.find(index);
+                if (it != m_renderbufferObjects.end()) {
+                    return it->second;
+                }
+                return nullptr;
+            }
+
+            Vector<Uint> RenderbufferState::GenerateNames(Uint number) {
+                Vector<Uint> buffers(number);
+                m_indexGenerator.Generate(number, buffers.data());
+                return buffers;
+            }
+
+            SharedPtr<RenderbufferObject> RenderbufferState::CreateRenderbufferObject(Uint index) {
+                auto bufferObject = MakeShared<RenderbufferObject>(index);
+                m_renderbufferObjects[index] = bufferObject;
+                return bufferObject;
+            }
+
+            BindingSlot<RenderbufferObject>& RenderbufferState::GetBindingSlot(RenderbufferTarget target) {
+                for (SizeT i = 0; i < m_bindingSlots.size(); ++i) {
+                    if (m_bindingSlots[i].GetTarget() == target) {
+                        return m_bindingSlots[i];
+                    }
+                }
+                MOBILEGL_ASSERT(false, "Invalid RenderbufferTarget enum value: %d", static_cast<int>(target));
+                return m_bindingSlots[0];
+            }
+
+            void RenderbufferState::MarkRenderbufferObjectForDeletion(Uint index) {
+                if (m_indexGenerator.IsValid(index)) {
+                    auto it = m_renderbufferObjects.find(index);
+                    if (it != m_renderbufferObjects.end()) {
+                        for (SizeT i = 0; i < m_bindingSlots.size(); ++i) {
+                            if (m_bindingSlots[i].GetBoundObject() == it->second) {
+                                m_bindingSlots[i].Bind(nullptr);
+                            }
+                        }
+                        m_renderbufferObjects.erase(it);
+                    }
+                    m_indexGenerator.Delete(index);
+                }
+            }
+
+            Bool RenderbufferState::ValidateName(Uint index) const {
+                return m_indexGenerator.IsValid(index);
+            }
+
+            Bool RenderbufferState::ValidateRenderbufferObject(Uint index) const {
+                return m_renderbufferObjects.find(index) != m_renderbufferObjects.end();
+            }
+        } // namespace GLState
+    } // namespace MG_State
+} // namespace MobileGL

MobileGL/MG_State/GLState/RenderbufferState/RenderbufferState.h

@@ -0,0 +1,29 @@
+#pragma once
+#include <Includes.h>
+#include <MG_Util/Miscellany/IndexGenerator.h>
+#include "RenderbufferObject.h"
+
+namespace MobileGL {
+    namespace MG_State {
+        namespace GLState {
+            class RenderbufferState {
+            public:
+                RenderbufferState();
+
+                SharedPtr<RenderbufferObject> GetRenderbufferObject(Uint index);
+                Vector<Uint> GenerateNames(Uint number);
+                SharedPtr<RenderbufferObject> CreateRenderbufferObject(Uint index);
+                BindingSlot<RenderbufferObject>& GetBindingSlot(RenderbufferTarget target);
+                void MarkRenderbufferObjectForDeletion(Uint index);
+                Bool ValidateName(Uint index) const;
+                Bool ValidateRenderbufferObject(Uint index) const;
+
+            private:
+                UnorderedMap<Uint, SharedPtr<RenderbufferObject>> m_renderbufferObjects;
+                IndexGenerator<Uint> m_indexGenerator;
+                Array<BindingSlot<RenderbufferObject>, static_cast<SizeT>(RenderbufferTarget::RenderbufferTargetCount)>
+                    m_bindingSlots;
+            };
+        } // namespace GLState
+    } // namespace MG_State
+} // namespace MobileGL