Add texture class and texture test

assets/glsl/texture.frag

@@ -0,0 +1,12 @@
+#version 450 core
+
+layout(location = 0) out vec4 color;
+
+in vec2 v_texCoord;
+
+uniform sampler2D u_texture;
+
+void main()
+{
+	color = texture(u_texture, v_texCoord);
+}

assets/glsl/texture.vert

@@ -0,0 +1,12 @@
+#version 450 core
+
+layout(location = 0) in vec3 a_position;
+layout(location = 1) in vec2 a_texCoord;
+
+out vec2 v_texCoord;
+
+void main()
+{
+	v_texCoord = a_texCoord;
+	gl_Position = vec4(a_position, 1.0f);
+}

inferno/src/inferno/application.cpp

@@ -12,6 +12,7 @@
 #include "inferno/render/context.h"
 #include "inferno/render/renderer.h"
 #include "inferno/render/shader.h"
+#include "inferno/render/texture.h"
 #include "inferno/window.h"
 
 namespace Inferno {
@@ -29,32 +30,68 @@ namespace Inferno {
 		m_window = std::make_unique<Window>();
 		m_window->setEventCallback(NF_BIND_EVENT(Application::onEvent));
 
-		float vertices[] = {
+		TextureManager textureManager;
+		m_texture = textureManager.load("assets/gfx/test.png");
+
+// -----------------------------------------
+
+		float verticesColor[] = {
 			-0.5f, -0.5f, 0.0f, 1.0f, 0.0f, 1.0f, 1.0f,
 			 0.5f, -0.5f, 0.0f, 1.0f, 1.0f, 0.0f, 1.0f,
 			 0.5f,  0.5f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f,
 			-0.5f,  0.5f, 0.0f, 1.0f, 1.0f, 1.0f, 1.0f,
 		};
 
-		uint32_t indices[] = {
+		uint32_t indicesColor[] = {
 			0, 1, 2, 2, 3, 0
 		};
 
-		m_vertexArray = std::make_shared<VertexArray>();
+		m_vertexArrayColor = std::make_shared<VertexArray>();
 
-		std::shared_ptr<VertexBuffer> vertexBuffer = std::make_shared<VertexBuffer>(vertices, sizeof(vertices));
-		vertexBuffer->setLayout({
+		std::shared_ptr<VertexBuffer> vertexBufferColor = std::make_shared<VertexBuffer>(verticesColor, sizeof(verticesColor));
+		vertexBufferColor->setLayout({
 			{ BufferElementType::Vec3, "a_position" },
 			{ BufferElementType::Vec4, "a_color" },
 		});
 
-		m_vertexArray->addVertexBuffer(vertexBuffer);
+		m_vertexArrayColor->addVertexBuffer(vertexBufferColor);
 
-		std::shared_ptr<IndexBuffer> indexBuffer = std::make_shared<IndexBuffer>(indices, sizeof(indices));
+		std::shared_ptr<IndexBuffer> indexBufferColor = std::make_shared<IndexBuffer>(indicesColor, sizeof(indicesColor));
 
-		m_vertexArray->setIndexBuffer(indexBuffer);
+		m_vertexArrayColor->setIndexBuffer(indexBufferColor);
 
-		m_shader = std::make_unique<Shader>("assets/glsl/simple.vert", "assets/glsl/simple.frag");
+// -----------------------------------------
+
+		m_vertexArrayTexture = std::make_shared<VertexArray>();
+
+		float verticesTexture[] = {
+			-0.5f, -0.5f, 0.0f, 0.0f, 0.0f,
+			 0.5f, -0.5f, 0.0f, 1.0f, 0.0f,
+			 0.5f,  0.5f, 0.0f, 1.0f, 1.0f,
+			-0.5f,  0.5f, 0.0f, 0.0f, 1.0f,
+		};
+
+		uint32_t indicesTexture[] = {
+			0, 1, 2, 2, 3, 0
+		};
+
+		std::shared_ptr<VertexBuffer> vertexBufferTexture = std::make_shared<VertexBuffer>(verticesTexture, sizeof(verticesTexture));
+		vertexBufferTexture->setLayout({
+			{ BufferElementType::Vec3, "a_position" },
+			{ BufferElementType::Vec2, "a_texCoord" },
+		});
+
+		m_vertexArrayTexture->addVertexBuffer(vertexBufferTexture);
+
+		std::shared_ptr<IndexBuffer> indexBufferTexture = std::make_shared<IndexBuffer>(indicesTexture, sizeof(indicesTexture));
+
+		m_vertexArrayTexture->setIndexBuffer(indexBufferTexture);
+
+// -----------------------------------------
+
+		m_shaderSimple = std::make_shared<Shader>("assets/glsl/simple.vert", "assets/glsl/simple.frag");
+		m_shaderTexture = std::make_shared<Shader>("assets/glsl/texture.vert", "assets/glsl/texture.frag");
+		m_shaderTexture->setInt("u_texture", m_texture->id());
 	}
 
 	Application::~Application()
@@ -74,10 +111,19 @@ namespace Inferno {
 			Command::clearColor({ 0.2f, 0.3f, 0.3f, 1.0f });
 			Command::clear();
 
-			Renderer::beginScene(); // camera, lights, environment
-			m_shader->bind();
-			Renderer::submit(m_vertexArray);
-			Renderer::endScene();
+			// Renderer::beginScene(); // camera, lights, environment
+
+			// m_shaderSimple->bind();
+			// Renderer::submit(m_vertexArrayColor);
+			// m_shaderSimple->unbind();
+
+			m_shaderTexture->bind();
+			m_texture->bind();
+			Renderer::submit(m_vertexArrayTexture);
+			m_texture->unbind();
+			m_shaderTexture->unbind();
+
+			// Renderer::endScene();
 
 			m_window->update();
 		}

inferno/src/inferno/application.h

@@ -6,9 +6,11 @@
 namespace Inferno {
 
 	class Event;
+	class Texture;
+	class TextureManager;
+	class Window;
 	class WindowCloseEvent;
 	class WindowResizeEvent;
-	class Window;
 
 	class VertexArray;
 	class Shader;
@@ -26,7 +28,7 @@ namespace Inferno {
 
 // -----------------------------------------
 
-		inline Window &getWindow() { return *m_window; }
+		inline Window& getWindow() const { return *m_window; }
 
 		static inline Application& get() { return *s_instance; }
 
@@ -34,8 +36,11 @@ namespace Inferno {
 		std::unique_ptr<Window> m_window;
 
 		//
-		std::shared_ptr<VertexArray> m_vertexArray;
-		std::unique_ptr<Shader> m_shader;
+		std::shared_ptr<VertexArray> m_vertexArrayColor;
+		std::shared_ptr<VertexArray> m_vertexArrayTexture;
+		std::shared_ptr<Shader> m_shaderSimple;
+		std::shared_ptr<Shader> m_shaderTexture;
+		std::shared_ptr<Texture> m_texture;
 		//
 
 		static Application* s_instance;

inferno/src/inferno/render/texture.cpp

@@ -0,0 +1,139 @@
+#include <climits> // UINT_MAX
+#include <memory>
+
+#include <glad/glad.h>
+#define STB_IMAGE_IMPLEMENTATION
+#include <stb_image.h>
+
+#include "inferno/assertions.h"
+#include "inferno/render/texture.h"
+
+namespace Inferno {
+
+	Texture::Texture(const std::string& path)
+	{
+		int width;
+		int height;
+		int channels;
+
+		// Load image data
+		stbi_set_flip_vertically_on_load(1);
+		unsigned char* data = stbi_load(path.c_str(), &width, &height, &channels, STBI_default);
+
+		ASSERT(data, "Failed to load image: '{}'", path);
+
+		m_width = width;
+		m_height = height;
+
+		if (channels == 4) {
+			m_internalFormat = GL_RGBA8;
+			m_dataFormat = GL_RGBA;
+		}
+		else if (channels == 3) {
+			m_internalFormat = GL_RGB8;
+			m_dataFormat = GL_RGB;
+		}
+
+		create(data);
+
+		// Clean resources
+		stbi_image_free(data);
+	}
+
+	Texture::~Texture()
+	{
+		glDeleteTextures(1, &m_id);
+	}
+
+	void Texture::bind() const
+	{
+		glBindTexture(GL_TEXTURE_2D, m_id);
+	}
+
+	void Texture::unbind() const
+	{
+		glBindTexture(GL_TEXTURE_2D, 0);
+	}
+
+	void Texture::create(unsigned char* data)
+	{
+		m_id = UINT_MAX;
+
+		// Create texture object
+		glGenTextures(1, &m_id);
+
+		// Bind texture object
+		glBindTexture(GL_TEXTURE_2D, m_id);
+
+		// Set unpacking of pixel data to byte-alignment,
+		// this prevents alignment issues when using a single byte for color
+		glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+
+		// Generate texture
+		glTexImage2D(
+			GL_TEXTURE_2D,     // Texture target
+			0,                 // Midmap level, base starts at level 0
+			m_internalFormat,  // Texture format
+			m_width, m_height, // Image width/height
+			0,                 // Always 0 (legacy)
+			m_dataFormat,      // Texture source format
+			GL_UNSIGNED_BYTE,  // Texture source datatype
+			data);             // Image data
+
+		// Set the texture wrapping / filtering options
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT); // X
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT); // Y
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); // Minify
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); // Magnify
+
+		// Automatically generate all mipmap levels
+		glGenerateMipmap(GL_TEXTURE_2D);
+
+		// Unbind texture object
+		glBindTexture(GL_TEXTURE_2D, 0);
+	}
+
+// -----------------------------------------
+
+	void TextureManager::add(const std::string& path, const std::shared_ptr<Texture>& texture)
+	{
+		// Construct (key, value) pair and insert it into the unordered_map
+		m_textureList.emplace(path, texture);
+	}
+
+	std::shared_ptr<Texture> TextureManager::load(const std::string& path)
+	{
+		if (exists(path)) {
+			return get(path);
+		}
+
+		std::shared_ptr<Texture> texture = std::make_shared<Texture>(path);
+		add(path, texture);
+		return get(path);
+	}
+
+	std::shared_ptr<Texture> TextureManager::get(const std::string& path)
+	{
+		return exists(path) ? m_textureList.at(path) : nullptr;
+	}
+
+	bool TextureManager::exists(const std::string& path)
+	{
+		return m_textureList.find(path) != m_textureList.end();
+	}
+
+	void TextureManager::remove(const std::string& path)
+	{
+		if (exists(path)) {
+			m_textureList.erase(path);
+		}
+	}
+
+	void TextureManager::remove(const std::shared_ptr<Texture>& texture)
+	{
+		if (exists(texture->path())) {
+			m_textureList.erase(texture->path());
+		}
+	}
+
+}

inferno/src/inferno/render/texture.h

@@ -0,0 +1,56 @@
+#ifndef TEXTURE_H
+#define TEXTURE_H
+
+#include <cstdint>  	 // std::uint32_t
+#include <memory>        // std::shared_ptr
+#include <string>		 // std::string
+#include <unordered_map> // std::unordered_map
+
+namespace Inferno {
+
+	class Texture {
+	public:
+		Texture(const std::string& path);
+		virtual ~Texture();
+
+		void bind() const;
+		void unbind() const;
+
+		inline std::string path() const { return m_path; }
+		inline uint32_t width() const { return m_width; }
+		inline uint32_t height() const { return m_height; }
+		inline uint32_t id() const { return m_id; }
+		inline uint32_t internalFormat() const { return m_internalFormat; }
+		inline uint32_t dataFormat() const { return m_dataFormat; }
+
+	protected:
+		void create(unsigned char* data);
+
+	private:
+		std::string m_path;
+		uint32_t m_width;
+		uint32_t m_height;
+		uint32_t m_id;
+		uint32_t m_internalFormat;
+		uint32_t m_dataFormat;
+	};
+
+// -----------------------------------------
+
+	class TextureManager {
+	public:
+		void add(const std::string& path, const std::shared_ptr<Texture>& texture);
+		std::shared_ptr<Texture> load(const std::string& path);
+		std::shared_ptr<Texture> get(const std::string& path);
+		bool exists(const std::string& path);
+
+		void remove(const std::string& path);
+		void remove(const std::shared_ptr<Texture>& texture);
+
+	private:
+		std::unordered_map<std::string, std::shared_ptr<Texture>> m_textureList;
+	};
+
+}
+
+#endif // TEXTURE_H