Asset+Render+App: Implement render to framebuffer

assets/scene/scene1.json

@@ -44,7 +44,7 @@
 			"id": { "id": 97897897 },
 			"tag": { "tag": "Quad 2" },
 			"transform" : {
-				"translate": [ 1.1, 0.0, 0.0 ],
+				"translate": [ 2.5, 0.0, 0.0 ],
 				"rotate": [ 0.0, 0.0, 0.0 ],
 				"scale": [ 1.0, 1.0, 1.0 ]
 			},
@@ -57,7 +57,7 @@
 			"id": { "id": 3424242 },
 			"tag": { "tag": "Quad 3" },
 			"transform" : {
-				"translate": [ 2.2, 1.0, 0.0 ],
+				"translate": [ 5.0, 1.0, 0.0 ],
 				"rotate": [ 0.0, 0.0, -20.0 ],
 				"scale": [ 1.0, 1.0, 1.0 ]
 			},
@@ -70,7 +70,7 @@
 					"id": { "id": 4345472 },
 					"tag": { "tag": "Quad 4" },
 					"transform" : {
-						"translate": [ 0.85, 0.0, 0.0 ],
+						"translate": [ 1.7, 0.0, 0.0 ],
 						"rotate": [ 0.0, 0.0, 0.0 ],
 						"scale": [ 0.5, 0.5, 1.0 ]
 					},
@@ -83,7 +83,7 @@
 							"id": { "id": 5234723 },
 							"tag": { "tag": "Quad 5" },
 							"transform" : {
-								"translate": [ 1.0, 0.0, 0.0 ],
+								"translate": [ 2.0, 0.0, 0.0 ],
 								"rotate": [ 0.0, 0.0, -20.0 ],
 								"scale": [ 0.5, 0.5, 1.0 ]
 							},

src/inferno/application.cpp

@@ -6,11 +6,13 @@
 
 #include <utility> // std::pair
 
+#include "glm/ext/vector_float3.hpp"
 #include "glm/gtc/type_ptr.hpp" // glm::make_mat4
 #include "ruc/format/log.h"
 #include "ruc/meta/assert.h"
 
 #include "inferno/application.h"
+#include "inferno/component/transformcomponent.h"
 #include "inferno/core.h"
 #include "inferno/event/applicationevent.h"
 #include "inferno/event/event.h"
@@ -20,6 +22,7 @@
 #include "inferno/keycodes.h"
 #include "inferno/render/buffer.h"
 #include "inferno/render/context.h"
+#include "inferno/render/framebuffer.h"
 // #include "inferno/render/gltf.h"
 #include "inferno/asset/shader.h"
 #include "inferno/asset/texture.h"
@@ -50,6 +53,11 @@ Application::Application()
 	Input::initialize();
 	RenderCommand::initialize();
 
+	m_framebuffer = std::make_unique<Framebuffer>(
+		Framebuffer::Properties { .type = Framebuffer::Type::Color | Framebuffer::Type::Depth | Framebuffer::Type::Stencil,
+	                              .width = m_window->getWidth(),
+	                              .height = m_window->getHeight() });
+
 	m_scene = std::make_shared<Scene>();
 	m_scene->initialize();
 
@@ -141,6 +149,10 @@ int Application::run()
 	// offset
 #endif
 
+	constexpr glm::vec4 vectorOne { 1.0f, 1.0f, 1.0f, 1.0f };
+	constexpr glm::mat4 matIdentity { 1.0f };
+	constexpr TransformComponent transformIdentity;
+
 	// m_window->setVSync(false);
 	while (!m_window->shouldClose()) {
 
@@ -149,6 +161,7 @@ int Application::run()
 		m_lastFrameTime = time;
 		// ruc::debug("Frametime {}ms", deltaTime * 1000);
 
+		// ---------------------------------
 		// Update
 
 		update();
@@ -157,12 +170,15 @@ int Application::run()
 		m_window->update();
 		m_scene->update(deltaTime);
 
+		// ---------------------------------
 		// Render
 
+		m_framebuffer->bind();
+
 		render();
 
 		RenderCommand::clearColor({ 0.2f, 0.3f, 0.3f, 1.0f });
-		RenderCommand::clear();
+		RenderCommand::clearColorDepthBit();
 
 		std::pair<glm::mat4, glm::mat4> projectionView = m_scene->cameraProjectionView();
 		RendererCubemap::the().beginScene(projectionView.first, projectionView.second); // camera, lights, environment
@@ -178,6 +194,20 @@ int Application::run()
 		Renderer2D::the().endScene();
 		RendererFont::the().endScene();
 
+		m_framebuffer->unbind();
+
+		// ---------------------------------
+		// Framebuffer
+
+		RenderCommand::clearColor({ 1.0f, 1.0f, 1.0f, 1.0f });
+		RenderCommand::clearColorBit();
+
+		Renderer2D::the().setEnableDepthBuffer(false);
+		Renderer2D::the().beginScene(matIdentity, matIdentity);
+		Renderer2D::the().drawQuad(transformIdentity, vectorOne, m_framebuffer->texture(0));
+		Renderer2D::the().endScene();
+		Renderer2D::the().setEnableDepthBuffer(true);
+
 		m_window->render();
 	}
 
@@ -212,6 +242,7 @@ bool Application::onWindowResize(WindowResizeEvent& e)
 	ruc::info("WindowResizeEvent {}x{}", e.getWidth(), e.getHeight());
 
 	RenderCommand::setViewport(0, 0, e.getWidth(), e.getHeight());
+	m_framebuffer->setSize(e.getWidth(), e.getHeight());
 
 	return true;
 }

src/inferno/application.h

@@ -12,12 +12,14 @@ namespace Inferno {
 
 class Event;
 class Font;
+class Framebuffer;
 class KeyPressEvent;
 class MousePositionEvent;
 class Scene;
 class Window;
 class WindowCloseEvent;
 class WindowResizeEvent;
+struct TransformComponent;
 
 class Application {
 public:
@@ -50,6 +52,7 @@ private:
 
 	std::unique_ptr<Window> m_window;
 	std::shared_ptr<Scene> m_scene;
+	std::unique_ptr<Framebuffer> m_framebuffer;
 
 	//
 	std::shared_ptr<Font> m_font;

src/inferno/asset/asset-manager.cpp

@@ -38,18 +38,22 @@ bool AssetManager::exists(std::string_view path)
 	return m_assetList.find(path.data()) != m_assetList.end();
 }
 
-void AssetManager::remove(std::string_view path)
+std::nullptr_t AssetManager::remove(std::string_view path)
 {
 	if (exists(path)) {
 		m_assetList.erase(path.data());
 	}
+
+	return nullptr;
 }
 
-void AssetManager::remove(std::shared_ptr<Asset> asset)
+std::nullptr_t AssetManager::remove(std::shared_ptr<Asset> asset)
 {
 	if (exists(asset->path())) {
 		m_assetList.erase(asset->path());
 	}
+
+	return nullptr;
 }
 
 } // namespace Inferno

src/inferno/asset/asset-manager.h

@@ -6,10 +6,12 @@
 
 #pragma once
 
-#include <memory> // std::shared_ptr
+#include <cstddef> // std::nullptr_t
+#include <memory>  // std::shared_ptr
 #include <string>
 #include <string_view>
 #include <unordered_map>
+#include <utility> // std::forward
 
 #include "ruc/meta/assert.h"
 #include "ruc/meta/types.h"
@@ -62,8 +64,8 @@ public:
 
 	void add(std::string_view path, std::shared_ptr<Asset> asset);
 	bool exists(std::string_view path);
-	void remove(std::string_view path);
+	std::nullptr_t remove(std::string_view path);
-	void remove(std::shared_ptr<Asset> asset);
+	std::nullptr_t remove(std::shared_ptr<Asset> asset);
 
 	template<IsAsset T>
 	std::shared_ptr<T> get(std::string_view path)
@@ -77,14 +79,14 @@ public:
 		return std::static_pointer_cast<T>(asset);
 	}
 
-	template<IsAsset T>
+	template<IsAsset T, typename... Args>
-	std::shared_ptr<T> load(std::string_view path)
+	std::shared_ptr<T> load(std::string_view path, Args&&... args)
 	{
 		if (exists(path)) {
 			return get<T>(path);
 		}
 
-		auto asset = T::create(path);
+		auto asset = T::create(path, std::forward<Args>(args)...);
 		add(path, asset);
 		return asset;
 	}

src/inferno/asset/texture.cpp

@@ -234,9 +234,11 @@ void TextureCubemap::createImpl()
 
 // -----------------------------------------
 
-std::shared_ptr<TextureFramebuffer> TextureFramebuffer::create(uint32_t width, uint32_t height, uint32_t internalFormat, uint32_t dataFormat, uint32_t dataType)
+std::shared_ptr<TextureFramebuffer> TextureFramebuffer::create(
+	std::string_view path,
+	uint32_t width, uint32_t height, uint32_t internalFormat, uint32_t dataFormat, uint32_t dataType)
 {
-	auto result = std::shared_ptr<TextureFramebuffer>(new TextureFramebuffer(""));
+	auto result = std::shared_ptr<TextureFramebuffer>(new TextureFramebuffer(path));
 
 	result->init(width, height, internalFormat, dataFormat, dataType);
 	result->createImpl();
@@ -244,6 +246,22 @@ std::shared_ptr<TextureFramebuffer> TextureFramebuffer::create(uint32_t width, u
 	return result;
 }
 
+void TextureFramebuffer::bind(uint32_t unit) const
+{
+	// Set active unit
+	glActiveTexture(GL_TEXTURE0 + unit);
+
+	glBindTexture(GL_TEXTURE_2D, m_id);
+
+	// Reset unit
+	glActiveTexture(GL_TEXTURE0);
+}
+
+void TextureFramebuffer::unbind() const
+{
+	glBindTexture(GL_TEXTURE_2D, 0);
+}
+
 void TextureFramebuffer::createImpl()
 {
 	m_id = UINT_MAX;

src/inferno/asset/texture.h

@@ -112,11 +112,11 @@ public:
 
 	// Factory function
 	static std::shared_ptr<TextureFramebuffer> create(
-		uint32_t width, uint32_t height,
+		std::string_view path,
-		uint32_t internalFormat, uint32_t dataFormat, uint32_t dataType = GL_UNSIGNED_BYTE);
+		uint32_t width, uint32_t height, uint32_t internalFormat, uint32_t dataFormat, uint32_t dataType = GL_UNSIGNED_BYTE);
 
-	virtual void bind(uint32_t) const override {}
+	virtual void bind(uint32_t unit) const override;
-	virtual void unbind() const override {}
+	virtual void unbind() const override;
 
 private:
 	TextureFramebuffer(std::string_view path)

src/inferno/render/framebuffer.cpp

@@ -7,7 +7,6 @@
 #include <cstdint> // int8_t
 
 #include "glad/glad.h"
-#include "ruc/format/log.h"
 #include "ruc/meta/assert.h"
 
 #include "inferno/asset/texture.h"
@@ -16,40 +15,17 @@
 namespace Inferno {
 
 Framebuffer::Framebuffer(const Properties& init)
+	: m_type(init.type)
+	, m_width(init.width)
+	, m_height(init.height)
 {
 	VERIFY(static_cast<int8_t>(init.type) != 0,
 	       "malformed framebuffer type: {}", init.type);
 
 	m_id = UINT_MAX;
 	glGenFramebuffers(1, &m_id);
-	bind();
-
-	if (init.type & Type::Color) {
-		ruc::error("color!");
-		// Set color attachment 0 out of 32
-		m_textures[0] = TextureFramebuffer::create(init.width, init.height, GL_RGB, GL_RGB);
-		glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, m_textures[0]->id(), 0);
-	}
-
-	// This combined texture is required for older GPUs
-	if (init.type & Type::Depth && init.type & Stencil) {
-		ruc::error("both!");
-		m_textures[3] = TextureFramebuffer::create(init.width, init.height, GL_DEPTH24_STENCIL8, GL_DEPTH_STENCIL, GL_UNSIGNED_INT_24_8);
-		glFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT, GL_TEXTURE_2D, m_textures[3]->id(), 0);
-	}
-	else if (init.type & Type::Depth) {
-		ruc::error("depth!");
-		m_textures[1] = TextureFramebuffer::create(init.width, init.height, GL_DEPTH_COMPONENT, GL_DEPTH_COMPONENT);
-		glFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, m_textures[1]->id(), 0);
-	}
-	else if (init.type & Type::Stencil) {
-		ruc::error("stencil!");
-		m_textures[2] = TextureFramebuffer::create(init.width, init.height, GL_STENCIL_INDEX, GL_STENCIL_INDEX);
-		glFramebufferTexture2D(GL_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, GL_TEXTURE_2D, m_textures[2]->id(), 0);
-	}
 
-	check();
+	createTextures();
-	unbind();
 }
 
 Framebuffer::~Framebuffer()
@@ -76,4 +52,57 @@ void Framebuffer::unbind() const
 	glBindFramebuffer(GL_FRAMEBUFFER, 0);
 }
 
+void Framebuffer::setSize(uint32_t width, uint32_t height)
+{
+	if (m_width == width && m_height == height) {
+		return;
+	}
+
+	m_width = width;
+	m_height = height;
+
+	createTextures();
+}
+
+// -----------------------------------------
+
+void Framebuffer::createTextures()
+{
+	bind();
+
+	m_textures[0] = AssetManager::the().remove(FRAMEBUFFER_TEXTURE_COLOR);
+	m_textures[1] = AssetManager::the().remove(FRAMEBUFFER_TEXTURE_DEPTH);
+	m_textures[2] = AssetManager::the().remove(FRAMEBUFFER_TEXTURE_STENCIL);
+	m_textures[3] = AssetManager::the().remove(FRAMEBUFFER_TEXTURE_DEPTH_STENCIL);
+
+	if (m_type & Type::Color) {
+		// Set color attachment 0 out of 32
+		m_textures[0] = AssetManager::the().load<TextureFramebuffer>(
+			FRAMEBUFFER_TEXTURE_COLOR, m_width, m_height, GL_RGB, GL_RGB);
+		m_textures[0]->bind(0);
+		glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, m_textures[0]->id(), 0);
+		m_textures[0]->unbind();
+	}
+
+	// This combined texture is required for older GPUs
+	if (m_type & Type::Depth && m_type & Stencil) {
+		m_textures[3] = AssetManager::the().load<TextureFramebuffer>(
+			FRAMEBUFFER_TEXTURE_DEPTH_STENCIL, m_width, m_height, GL_DEPTH24_STENCIL8, GL_DEPTH_STENCIL, GL_UNSIGNED_INT_24_8);
+		glFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT, GL_TEXTURE_2D, m_textures[3]->id(), 0);
+	}
+	else if (m_type & Type::Depth) {
+		m_textures[1] = AssetManager::the().load<TextureFramebuffer>(
+			FRAMEBUFFER_TEXTURE_DEPTH, m_width, m_height, GL_DEPTH_COMPONENT, GL_DEPTH_COMPONENT);
+		glFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, m_textures[1]->id(), 0);
+	}
+	else if (m_type & Type::Stencil) {
+		m_textures[2] = AssetManager::the().load<TextureFramebuffer>(
+			FRAMEBUFFER_TEXTURE_STENCIL, m_width, m_height, GL_STENCIL_INDEX, GL_STENCIL_INDEX);
+		glFramebufferTexture2D(GL_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, GL_TEXTURE_2D, m_textures[2]->id(), 0);
+	}
+
+	check();
+	unbind();
+}
+
 } // namespace Inferno

src/inferno/render/framebuffer.h

@@ -12,6 +12,12 @@
 #include "inferno/asset/texture.h"
 #include "ruc/meta/core.h"
 
+// AssetManager paths to the global framebuffer textures
+#define FRAMEBUFFER_TEXTURE_COLOR "@framebuffer-color"
+#define FRAMEBUFFER_TEXTURE_DEPTH "@framebuffer-depth"
+#define FRAMEBUFFER_TEXTURE_STENCIL "@framebuffer-stencil"
+#define FRAMEBUFFER_TEXTURE_DEPTH_STENCIL "@framebuffer-depth-stencil"
+
 namespace Inferno {
 
 class Framebuffer final { // Frame Buffer Object, FBO
@@ -37,7 +43,21 @@ public:
 	void bind() const;
 	void unbind() const;
 
+	void setSize(uint32_t width, uint32_t height);
+
+	Type type() const { return m_type; }
+	uint32_t width() const { return m_width; }
+	uint32_t height() const { return m_height; }
+	uint32_t id() const { return m_id; }
+	std::shared_ptr<TextureFramebuffer> texture(uint8_t index) const { return m_textures[index]; }
+
+private:
+	void createTextures();
+
 private:
+	Type m_type { None };
+	uint32_t m_width { 0 };
+	uint32_t m_height { 0 };
 	uint32_t m_id { 0 };
 	std::shared_ptr<TextureFramebuffer> m_textures[4] { nullptr, nullptr, nullptr, nullptr };
 };

src/inferno/render/render-command.cpp

@@ -29,11 +29,16 @@ void RenderCommand::destroy()
 {
 }
 
-void RenderCommand::clear()
+void RenderCommand::clearColorDepthBit()
 {
 	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 }
 
+void RenderCommand::clearColorBit()
+{
+	glClear(GL_COLOR_BUFFER_BIT);
+}
+
 void RenderCommand::clearColor(const glm::vec4& color)
 {
 	glClearColor(color.r, color.g, color.b, color.a);

src/inferno/render/render-command.h

@@ -19,7 +19,8 @@ public:
 	static void initialize();
 	static void destroy();
 
-	static void clear();
+	static void clearColorDepthBit();
+	static void clearColorBit();
 	static void clearColor(const glm::vec4& color);
 	static void drawIndexed(std::shared_ptr<VertexArray> vertexArray, uint32_t indexCount = 0);
 

src/inferno/render/renderer.cpp

@@ -124,8 +124,8 @@ void Renderer<T>::unbind()
 template<typename T>
 void Renderer<T>::createElementBuffer()
 {
-	// CPU
 	// ---------------------------------
+	// CPU
 
 	// Generate indices
 
@@ -143,8 +143,8 @@ void Renderer<T>::createElementBuffer()
 		offset += vertexPerQuad;
 	}
 
-	// GPU
 	// ---------------------------------
+	// GPU
 
 	// Create index buffer
 	auto indexBuffer = std::make_shared<IndexBuffer>(elements, sizeof(uint32_t) * maxElements);
@@ -199,21 +199,21 @@ Renderer2D::Renderer2D(s)
 {
 	Renderer::initialize();
 
-	// CPU
 	// ---------------------------------
+	// CPU
 
 	// Create array for storing quads vertices
 	m_vertexBufferBase = new QuadVertex[maxVertices];
 	m_vertexBufferPtr = m_vertexBufferBase;
 
 	// Set default quad vertex positions
-	m_vertexPositions[0] = { -0.5f, -0.5f, 0.0f, 1.0f };
+	m_vertexPositions[0] = { -1.0f, -1.0f, 0.0f, 1.0f };
-	m_vertexPositions[1] = { 0.5f, -0.5f, 0.0f, 1.0f };
+	m_vertexPositions[1] = { 1.0f, -1.0f, 0.0f, 1.0f };
-	m_vertexPositions[2] = { 0.5f, 0.5f, 0.0f, 1.0f };
+	m_vertexPositions[2] = { 1.0f, 1.0f, 0.0f, 1.0f };
-	m_vertexPositions[3] = { -0.5f, 0.5f, 0.0f, 1.0f };
+	m_vertexPositions[3] = { -1.0f, 1.0f, 0.0f, 1.0f };
 
-	// GPU
 	// ---------------------------------
+	// GPU
 
 	// Create vertex buffer
 	auto vertexBuffer = std::make_shared<VertexBuffer>(sizeof(QuadVertex) * maxVertices);
@@ -290,8 +290,8 @@ RendererCubemap::RendererCubemap(s)
 {
 	Renderer::initialize();
 
-	// CPU
 	// ---------------------------------
+	// CPU
 
 	// Create array for storing quads vertices
 	m_vertexBufferBase = new CubemapVertex[maxVertices];
@@ -335,8 +335,8 @@ RendererCubemap::RendererCubemap(s)
 	m_vertexPositions[22] = { 0.5f, -0.5f, 0.5f, 1.0f };
 	m_vertexPositions[23] = { 0.5f, -0.5f, -0.5f, 1.0f };
 
-	// GPU
 	// ---------------------------------
+	// GPU
 
 	m_enableDepthBuffer = false;
 
@@ -405,15 +405,15 @@ RendererFont::RendererFont(s)
 {
 	Renderer::initialize();
 
-	// CPU
 	// ---------------------------------
+	// CPU
 
 	// Create array for storing quads vertices
 	m_vertexBufferBase = new SymbolVertex[maxVertices];
 	m_vertexBufferPtr = m_vertexBufferBase;
 
-	// GPU
 	// ---------------------------------
+	// GPU
 
 	m_enableDepthBuffer = false;
 
@@ -477,15 +477,15 @@ Renderer3D::Renderer3D(s)
 {
 	Renderer::initialize();
 
-	// CPU
 	// ---------------------------------
+	// CPU
 
 	// Create array for storing quads vertices
 	m_vertexBufferBase = new Vertex[maxVertices];
 	m_vertexBufferPtr = m_vertexBufferBase;
 
-	// GPU
 	// ---------------------------------
+	// GPU
 
 	m_enableDepthBuffer = true;
 
@@ -545,15 +545,15 @@ void Renderer3D::beginScene(glm::mat4 cameraProjection, glm::mat4 cameraView)
 
 void Renderer3D::createElementBuffer()
 {
-	// CPU
 	// ---------------------------------
+	// CPU
 
 	// Create array for storing quads vertices
 	m_elementBufferBase = new uint32_t[maxElements];
 	m_elementBufferPtr = m_elementBufferBase;
 
-	// GPU
 	// ---------------------------------
+	// GPU
 
 	// Create index buffer
 	auto indexBuffer = std::make_shared<IndexBuffer>(m_elementBufferBase, sizeof(uint32_t) * maxElements);

src/inferno/render/renderer.h

@@ -76,6 +76,8 @@ public:
 	virtual void beginScene(glm::mat4 cameraProjection, glm::mat4 cameraView);
 	virtual void endScene();
 
+	void setEnableDepthBuffer(bool state) { m_enableDepthBuffer = state; }
+
 protected:
 	Renderer() {}
 	virtual ~Renderer() { destroy(); };