4 files changed, 192 insertions, 13 deletions

diff --git a/src/Framebuffer.cpp b/src/Framebuffer.cpp
new file mode 100644
index 0000000..7127a57
--- /dev/null
+++ b/src/Framebuffer.cpp
@@ -0,0 +1,125 @@
+#include "Framebuffer.hpp"
+#include "Shader.hpp"
+#include <string>
+#include "Utility.hpp"
+
+GLuint quadVao, quadVbo;
+Shader *quadShader = nullptr;
+
+Framebuffer::Framebuffer(unsigned int width, unsigned int height, bool createDepthStencilBuffer) : width(width), height(height) {
+	if (quadShader == nullptr) {
+		float quadVertices[] = {
+			// positions   // texCoords
+			-1.0f,  1.0f,  0.0f, 1.0f,
+			-1.0f, -1.0f,  0.0f, 0.0f,
+			 1.0f, -1.0f,  1.0f, 0.0f,
+
+			-1.0f,  1.0f,  0.0f, 1.0f,
+			 1.0f, -1.0f,  1.0f, 0.0f,
+			 1.0f,  1.0f,  1.0f, 1.0f
+		};
+
+		glGenVertexArrays(1, &quadVao);
+		glGenBuffers(1, &quadVbo);
+		glBindVertexArray(quadVao);
+		glBindBuffer(GL_ARRAY_BUFFER, quadVbo);
+		glBufferData(GL_ARRAY_BUFFER, sizeof(quadVertices), &quadVertices, GL_STATIC_DRAW);
+		glEnableVertexAttribArray(0);
+		glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 4 * sizeof(float), (void*)0);
+		glEnableVertexAttribArray(1);
+		glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 4 * sizeof(float), (void*)(2 * sizeof(float)));
+		quadShader = new Shader("./shaders/fbo.vs", "./shaders/fbo.fs");
+		quadShader->Use();
+		glUniform1i(glGetUniformLocation(quadShader->Program, "inputTexture"), 1);
+		glActiveTexture(GL_TEXTURE1);
+		glCheckError();
+	}
+
+	glGenTextures(1, &texColor);
+	glBindTexture(GL_TEXTURE_2D, texColor);
+	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, NULL);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+	glCheckError();
+
+	if (createDepthStencilBuffer) {
+		glGenRenderbuffers(1, &rboDepthStencil);
+		glBindRenderbuffer(GL_RENDERBUFFER, rboDepthStencil);
+		glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH24_STENCIL8, width, height);
+	}
+
+	glGenFramebuffers(1, &fbo);
+	glBindFramebuffer(GL_FRAMEBUFFER, fbo);
+	glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texColor, 0);
+	if(createDepthStencilBuffer)
+		glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT, GL_RENDERBUFFER, rboDepthStencil);
+	glCheckError();
+
+	GLenum framebufferStatus = glCheckFramebufferStatus(GL_FRAMEBUFFER);
+	if (framebufferStatus != GL_FRAMEBUFFER_COMPLETE)
+		throw std::runtime_error("Failed to initialize framebuffer: " + std::to_string(framebufferStatus));	
+}
+
+Framebuffer::~Framebuffer() {
+	if (rboDepthStencil)
+		glDeleteRenderbuffers(1, &rboDepthStencil);
+	if (texColor)
+		glDeleteTextures(1, &texColor);
+
+	glDeleteFramebuffers(1, &fbo);
+}
+
+void Framebuffer::Activate() {
+	glViewport(0, 0, width, height);
+	glBindFramebuffer(GL_FRAMEBUFFER, fbo);
+}
+
+void Framebuffer::RenderTo(Framebuffer &target) {
+	glBindFramebuffer(GL_FRAMEBUFFER, target.fbo);
+	glViewport(0, 0, target.width, target.height);
+	glBindVertexArray(quadVao);
+	glUseProgram(quadShader->Program);
+	glBindTexture(GL_TEXTURE_2D, texColor);
+	glDrawArrays(GL_TRIANGLES, 0, 6);
+}
+
+void Framebuffer::Resize(unsigned int newWidth, unsigned int newHeight) {
+	width = newWidth;
+	height = newHeight;
+	if (texColor) {
+		glBindTexture(GL_TEXTURE_2D, texColor);
+		glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, newWidth, newHeight, 0, GL_RGB, GL_UNSIGNED_BYTE, NULL);
+	}	
+	if (rboDepthStencil) {
+		glBindRenderbuffer(GL_RENDERBUFFER, rboDepthStencil);
+		glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH24_STENCIL8, width, height);
+	}
+}
+
+Framebuffer &Framebuffer::GetDefault()
+{
+	static char fboDefaultData[sizeof(Framebuffer)];
+	static Framebuffer *fboDefault = nullptr;
+	if (fboDefault == nullptr) {
+		fboDefault = reinterpret_cast<Framebuffer*>(fboDefaultData);
+		fboDefault->fbo = 0;
+		fboDefault->width = 1;
+		fboDefault->height = 1;
+		fboDefault->texColor = 0;
+		fboDefault->rboDepthStencil = 0;
+	}
+	return *fboDefault;
+}
+
+void Framebuffer::Clear(bool color, bool depth, bool stencil)
+{
+	Activate();
+	GLbitfield clearBits = 0;
+	if (color)
+		clearBits |= GL_COLOR_BUFFER_BIT;
+	if (depth)
+		clearBits |= GL_DEPTH_BUFFER_BIT;
+	if (stencil)
+		clearBits |= GL_STENCIL_BUFFER_BIT;
+	glClear(clearBits);
+}
diff --git a/src/Framebuffer.hpp b/src/Framebuffer.hpp
new file mode 100644
index 0000000..6e0d33e
--- /dev/null
+++ b/src/Framebuffer.hpp
@@ -0,0 +1,29 @@
+#pragma once
+
+#include <gl/glew.h>
+
+class Framebuffer {
+	unsigned int width, height;
+	GLuint fbo, texColor = 0, rboDepthStencil = 0;
+public:
+	Framebuffer(unsigned int width, unsigned int height, bool createDepthStencilBuffer);
+	~Framebuffer();	
+	Framebuffer(const Framebuffer&) = delete;
+	Framebuffer(Framebuffer &&) = delete;
+	Framebuffer &operator=(const Framebuffer &) = delete;
+	Framebuffer &operator=(Framebuffer &&) = delete;
+
+	void Activate();
+
+	void RenderTo(Framebuffer &target);
+
+	void Resize(unsigned int newWidth, unsigned int newHeight);
+
+	inline GLuint GetColor() {
+		return texColor;
+	}
+
+	static Framebuffer &GetDefault();
+
+	void Clear(bool color = true, bool depth = true, bool stencil = true);
+};
\ No newline at end of file
diff --git a/src/Render.cpp b/src/Render.cpp
index 21e815c..41f2c7e 100644
--- a/src/Render.cpp
+++ b/src/Render.cpp
@@ -13,6 +13,7 @@
 #include "GameState.hpp"
 #include "RendererWorld.hpp"
 #include "Settings.hpp"
+#include "Framebuffer.hpp"
 
 Render::Render(unsigned int windowWidth, unsigned int windowHeight,
                std::string windowTitle)
@@ -40,6 +41,7 @@ Render::Render(unsigned int windowWidth, unsigned int windowHeight,
 	fieldWireframe = Settings::ReadBool("wireframe", false);
 	fieldFlight = Settings::ReadBool("flight", false);
 	fieldBrightness = Settings::ReadDouble("brightness", 0.2f);
+	fieldResolutionScale = Settings::ReadDouble("resolutionScale", 1.0f);
 
 	//Apply settings
 	if (fieldSensetivity != sensetivity)
@@ -52,6 +54,7 @@ Render::Render(unsigned int windowWidth, unsigned int windowHeight,
 	}
 	else
 		SDL_GL_SetSwapInterval(0);
+	framebuffer->Resize(renderState.WindowWidth * fieldResolutionScale, renderState.WindowHeight * fieldResolutionScale);
 
     LOG(INFO) << "Supported threads: " << std::thread::hardware_concurrency();
 }
@@ -66,8 +69,10 @@ Render::~Render() {
 	Settings::WriteBool("wireframe", fieldWireframe);
 	Settings::WriteBool("flight", fieldFlight);
 	Settings::WriteDouble("brightness", fieldBrightness);
+	Settings::WriteDouble("resolutionScale", fieldResolutionScale);
 	Settings::Save();
-
+	
+	framebuffer.reset();
     ImGui_ImplSdlGL3_Shutdown();
     SDL_GL_DeleteContext(glContext);
     SDL_DestroyWindow(window);
@@ -115,7 +120,7 @@ void Render::InitGlew() {
     int width, height;
     SDL_GL_GetDrawableSize(window, &width, &height);
     glViewport(0, 0, width, height);
-    glClearColor(0.8,0.8,0.8, 1.0f);
+	glClearColor(0.8,0.8,0.8, 1.0f);
     glEnable(GL_DEPTH_TEST);
 
     glEnable(GL_CULL_FACE);
@@ -136,6 +141,12 @@ void Render::PrepareToRendering() {
 	glBindTexture(GL_TEXTURE_2D_ARRAY, AssetManager::GetTextureAtlasId());
 
     ImGui_ImplSdlGL3_Init(window);
+
+	int width, height;
+	SDL_GL_GetDrawableSize(window, &width, &height);
+	framebuffer = std::make_unique<Framebuffer>(width, height, true);
+	Framebuffer::GetDefault().Activate();
+	Framebuffer::GetDefault().Resize(width, height);
 }
 
 void Render::UpdateKeyboard() {
@@ -160,20 +171,25 @@ void Render::UpdateKeyboard() {
 }
 
 void Render::RenderFrame() {
-    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+	framebuffer->Clear();
+	Framebuffer::GetDefault().Clear();	
 
+	if (renderWorld)
+		framebuffer->Activate();
     if (isWireframe)
         glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
     if (renderWorld)
         world->Render(renderState);
     if (isWireframe)
-        glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
+        glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);	
+	if (renderWorld)
+		framebuffer->RenderTo(Framebuffer::GetDefault());
 
-    if (world) {
-        world->Update(timer.RemainTimeMs());
-    }
+	RenderGui();
 
-    RenderGui();
+	if (world) {
+		world->Update(timer.RemainTimeMs());
+	}
 
     SDL_GL_SwapWindow(window);
 }
@@ -196,9 +212,10 @@ void Render::HandleEvents() {
                     case SDL_WINDOWEVENT_RESIZED: {
                         int width, height;
                         SDL_GL_GetDrawableSize(window, &width, &height);
-                        glViewport(0, 0, width, height);
                         renderState.WindowWidth = width;
                         renderState.WindowHeight = height;
+						framebuffer->Resize(width * fieldResolutionScale, height * fieldResolutionScale);
+						Framebuffer::GetDefault().Resize(width, height);
                         break;
                     }
 
@@ -581,6 +598,8 @@ void Render::RenderGui() {
 
 			ImGui::SliderFloat("Target FPS", &fieldTargetFps, 1.0f, 300.0f);
 
+			ImGui::SliderFloat("Resolution scale", &fieldResolutionScale, 0.1f, 2.0f);
+
 			ImGui::Checkbox("Wireframe", &fieldWireframe);
 
             ImGui::Checkbox("VSync", &fieldVsync);
@@ -608,6 +627,9 @@ void Render::RenderGui() {
 
 				PUSH_EVENT("SetMinLightLevel", fieldBrightness);
 
+				int width, height;
+				SDL_GL_GetDrawableSize(window, &width, &height);
+				framebuffer->Resize(width * fieldResolutionScale, height * fieldResolutionScale);
             }
             ImGui::Separator();
 
@@ -648,7 +670,7 @@ void Render::InitEvents() {
         stateString = "Playing";
         renderWorld = true;
         GlobalState::SetState(State::Playing);
-        glClearColor(0, 0, 0, 1.0f);
+		glClearColor(0, 0, 0, 1.0f);
 		world->GameStatePtr()->player->isFlying = this->fieldFlight;
 		PUSH_EVENT("SetMinLightLevel", fieldBrightness);
     });
@@ -658,7 +680,7 @@ void Render::InitEvents() {
         renderWorld = false;
         world.reset();
         GlobalState::SetState(State::MainMenu);
-        glClearColor(0.8, 0.8, 0.8, 1.0f);
+		glClearColor(0.8, 0.8, 0.8, 1.0f);
     });
 
     listener.RegisterHandler("Disconnected", [this](const Event& eventData) {
@@ -666,7 +688,7 @@ void Render::InitEvents() {
         renderWorld = false;
         world.reset();
         GlobalState::SetState(State::MainMenu);
-        glClearColor(0.8, 0.8, 0.8, 1.0f);
+		glClearColor(0.8, 0.8, 0.8, 1.0f);
     });
 
     listener.RegisterHandler("Connecting", [this](const Event&) {
diff --git a/src/Render.hpp b/src/Render.hpp
index adb0547..eea5450 100644
--- a/src/Render.hpp
+++ b/src/Render.hpp
@@ -12,6 +12,7 @@
 #include "Event.hpp"
 
 class RendererWorld;
+class Framebuffer;
 
 class Render {
     SDL_Window *window;
@@ -28,7 +29,8 @@ class Render {
     std::map<SDL_Scancode, bool> isKeyPressed;
     bool HasFocus=true;
     float sensetivity = 0.1f;
-    bool isWireframe = false;
+    bool isWireframe = false;	
+	std::unique_ptr<Framebuffer> framebuffer;
     std::vector<std::string> chatMessages;
 	EventListener listener;
     std::string stateString;
@@ -41,6 +43,7 @@ class Render {
 	bool fieldVsync;
 	bool fieldFlight;
 	float fieldBrightness;
+	float fieldResolutionScale;
 
 	void SetMouseCapture(bool IsCaptured);