feat: add ui renderer

include/Cubed/app.hpp

@@ -20,15 +20,16 @@ public:
     
 private:
     Camera m_camera;
+    TextureManager m_texture_manager;
     World m_world;
-    Renderer m_renderer{m_camera, m_world};
+    Renderer m_renderer{m_camera, m_world, m_texture_manager};
 
     Window m_window{m_renderer};
     
     
     GLuint m_texture_array;
     
-    TextureManager m_texture_manager;
+    
     
     
     void init();

include/Cubed/config.hpp

@@ -3,7 +3,7 @@ constexpr int WORLD_SIZE_X = 32;
 constexpr int WORLD_SIZE_Z = 32;
 constexpr int WORLD_SIZE_Y = 16;
 constexpr int MAX_BLOCK_NUM = 2;
-
+constexpr int MAX_UI_NUM = 1;
 
 constexpr int CHUCK_SIZE = 16;
 constexpr int DISTANCE = 8;
@@ -82,4 +82,34 @@ constexpr int OUTLINE_CUBE_INDICES[24] = {
         0,1, 1,2, 2,3, 3,0,
         4,5, 5,6, 6,7, 7,4,
         0,4, 1,5, 2,6, 3,7
-    };
+    };
+
+constexpr float SQUARE_VERTICES[6][2] = {
+        -0.5f, -0.5f,  // bottom left
+        -0.5f,  0.5f,  // top left
+        0.5f,  0.5f,  // top right
+        0.5f,  0.5f,  // top right
+        0.5f, -0.5f,  // bottom right
+        -0.5f, -0.5f   // bottom left
+    };
+
+constexpr float SQUARE_TEXTURE_POS[6][2] = {
+        0.0f, 0.0f,
+        0.0f, 1.0f,
+        1.0f, 1.0f,
+        1.0f, 1.0f,
+        1.0f, 0.0f,
+        0.0f, 0.0f,
+    };
+
+struct Vertex {
+    float x, y, z;
+    float s, t;
+    float layer;
+};
+
+struct Vertex2D {
+    float x, y;
+    float s, t;
+    float layer;
+};

include/Cubed/gameplay/chunk_status.hpp

@@ -13,8 +13,4 @@ struct ChunkPos {
     };
 };
 
-struct Vertex {
+
-    float x, y, z;
-    float s, t;
-    float layer;
-};

include/Cubed/renderer.hpp

@@ -1,22 +1,27 @@
 #pragma once
+
+#include <Cubed/config.hpp>
+
 #include <glad/glad.h>
 #include <glm/glm.hpp>
 #include <vector>
 
 class Camera;
+class TextureManager;
 class World;
 class Renderer {
 public:
     constexpr static int NUM_VAO = 1;
 
-    Renderer(const Camera& camera, World& world);
+    Renderer(const Camera& camera, World& world, const TextureManager& texture_manager);
     ~Renderer();
     void init();
-    void render(GLuint texture_array);
+    void render();
-    void update_proj_matrix(float aspect);
+    void update_proj_matrix(float aspect, float width, float height);
 private:
     
     const Camera& m_camera;
+    const TextureManager& m_texture_manager;
     World& m_world;
 
     glm::mat4 m_p_mat, m_v_mat, m_m_mat, m_mv_mat, m_mvp_mat;
@@ -27,13 +32,20 @@ private:
     GLuint m_sky_vbo;
     GLuint m_outline_indices_vbo;
     GLuint m_outline_vbo;
+    GLuint m_ui_vbo;
 
     GLuint m_sky_program;
     GLuint m_outline_program;
+    GLuint m_ui_program;
     GLuint m_world_program;
     
+
+    glm::mat4 m_ui_proj;
+    glm::mat4 m_ui_m_matrix;
+
     std::vector<GLuint> m_vao;
-    
+    std::vector<Vertex2D> m_ui;
     void render_outline();
     void render_sky();
+    void render_ui();
 };

include/Cubed/texture_manager.hpp

@@ -6,19 +6,20 @@
 
 class TextureManager {
 private:
-    GLuint m_texture_array;
     GLuint m_block_status_array;
-    void load_block_status(int status_id);
+    GLuint m_texture_array; 
+    GLuint m_ui_array;
+    void load_block_status(unsigned status_id);
     void load_block_texture(unsigned block_id);
-    
+    void load_ui_texture(unsigned id);
 public:
     TextureManager();
     ~TextureManager();
 
     void delet_texture(); 
-    GLuint get_block_status_array();
+    GLuint get_block_status_array() const;
-    GLuint get_texture_array();
+    GLuint get_texture_array() const;
-    
+    GLuint get_ui_array() const;
     // Must call after MapTable::init_map() and glfwMakeContextCurrent(window);
     void init_texture();
 };

src/app.cpp

@@ -36,7 +36,7 @@ void App::init() {
    
     m_renderer.init();
     m_window.update_viewport();
-    MapTable::init_map();
+    //MapTable::init_map();
     m_texture_manager.init_texture();
     m_world.init_world();
     m_texture_array = m_texture_manager.get_texture_array();
@@ -98,7 +98,7 @@ void App::window_reshape_callback(GLFWwindow* window, int new_width, int new_hei
 
 void App::render() {
 
-    m_renderer.render(m_texture_array);
+    m_renderer.render();
 
     glfwSwapBuffers(m_window.get_glfw_window());
 

src/renderer.cpp

@@ -1,6 +1,7 @@
 #include <Cubed/camera.hpp>
 #include <Cubed/config.hpp>
 #include <Cubed/gameplay/world.hpp>
+#include <Cubed/texture_manager.hpp>
 #include <Cubed/renderer.hpp>
 #include <Cubed/tools/cubed_assert.hpp>
 #include <Cubed/tools/log.hpp>
@@ -8,8 +9,9 @@
 
 #include <GLFW/glfw3.h>
 #include <glm/gtc/type_ptr.hpp>
-Renderer::Renderer(const Camera& camera, World& world):
+Renderer::Renderer(const Camera& camera, World& world, const TextureManager& texture_manager):
     m_camera(camera),
+    m_texture_manager(texture_manager),
     m_world(world)
 {
     
@@ -20,11 +22,13 @@ Renderer::~Renderer() {
     glDeleteBuffers(1, &m_outline_vbo);
     glDeleteBuffers(1, &m_outline_indices_vbo);
     glDeleteBuffers(1, &m_sky_vbo);
+    glDeleteBuffers(1, &m_ui_vbo);
     glBindVertexArray(0);
     glDeleteVertexArrays(NUM_VAO, m_vao.data());
     glDeleteProgram(m_world_program);
     glDeleteProgram(m_outline_program);
     glDeleteProgram(m_sky_program);
+    glDeleteProgram(m_ui_program);
 }
 
 
@@ -40,10 +44,12 @@ void Renderer::init() {
     m_world_program = Shader::create_shader_program("shaders/block_v_shader.glsl", "shaders/block_f_shader.glsl");
     m_outline_program = Shader::create_shader_program("shaders/outline_v_shader.glsl", "shaders/outline_f_shader.glsl");
     m_sky_program = Shader::create_shader_program("shaders/sky_v_shader.glsl", "shaders/sky_f_shader.glsl");
-
+    m_ui_program = Shader::create_shader_program("shaders/ui_v_shader.glsl", "shaders/ui_f_shader.glsl");
+    
     glEnable(GL_DEPTH_TEST);
     glDepthFunc(GL_LEQUAL);
-
+    glEnable(GL_BLEND);
+    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
     #ifndef NDEBUG    
     glEnable(GL_DEBUG_OUTPUT);
     glDebugMessageCallback([](GLenum source, GLenum type, GLuint id, GLenum severity, GLsizei length, const GLchar* message, const void* user_param) {
@@ -69,14 +75,26 @@ void Renderer::init() {
     glBindBuffer(GL_ARRAY_BUFFER, m_sky_vbo);
     glBufferData(GL_ARRAY_BUFFER, sizeof(VERTICES_POS), VERTICES_POS, GL_STATIC_DRAW);
 
+    glGenBuffers(1, &m_ui_vbo);
+    glBindBuffer(GL_ARRAY_BUFFER, m_ui_vbo);
+
+    for (int i = 0; i < 6; i++) {
+        Vertex2D vex {
+            SQUARE_VERTICES[i][0],
+            SQUARE_VERTICES[i][1],
+            SQUARE_TEXTURE_POS[i][0],
+            SQUARE_TEXTURE_POS[i][1],
+            0
+        };
+        m_ui.emplace_back(vex);
+    }
+
+    glBufferData(GL_ARRAY_BUFFER, m_ui.size() * sizeof(Vertex2D), m_ui.data(), GL_STATIC_DRAW);
+
     glBindBuffer(GL_ARRAY_BUFFER, 0);
-
-
-
-
 }
 
-void Renderer::render(GLuint texture_array) {
+void Renderer::render() {
     glClearColor(0.0, 0.0, 0.0, 1.0);
     glClear(GL_COLOR_BUFFER_BIT);
     glClear(GL_DEPTH_BUFFER_BIT);
@@ -88,7 +106,7 @@ void Renderer::render(GLuint texture_array) {
     m_proj_loc = glGetUniformLocation(m_world_program, "proj_matrix");
     glActiveTexture(GL_TEXTURE0);
 
-    glBindTexture(GL_TEXTURE_2D_ARRAY, texture_array);
+    glBindTexture(GL_TEXTURE_2D_ARRAY, m_texture_manager.get_texture_array());
     m_m_mat = glm::translate(glm::mat4(1.0f), glm::vec3(0.0f, 0.0f, 0.0f));
     m_v_mat = m_camera.get_camera_lookat();
     m_mv_mat = m_v_mat * m_m_mat;  
@@ -98,6 +116,8 @@ void Renderer::render(GLuint texture_array) {
     m_world.render(m_mvp_mat);
     
     render_outline();
+
+    render_ui();
 }
 
 void Renderer::render_outline() {
@@ -150,6 +170,41 @@ void Renderer::render_sky() {
     
 }
 
-void Renderer::update_proj_matrix(float aspect) {
+void Renderer::render_ui() {
+    glUseProgram(m_ui_program);
+    glDisable(GL_DEPTH_TEST);
+
+    m_mv_loc = glGetUniformLocation(m_ui_program, "m_matrix");
+    m_proj_loc = glGetUniformLocation(m_ui_program, "proj_matrix");
+
+    glUniformMatrix4fv(m_mv_loc, 1, GL_FALSE, glm::value_ptr(m_ui_m_matrix));
+    glUniformMatrix4fv(m_proj_loc, 1, GL_FALSE, glm::value_ptr(m_ui_proj));
+
+    glBindBuffer(GL_ARRAY_BUFFER, m_ui_vbo);
+    glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex2D), (void*)0);
+    glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex2D), (void*)offsetof(Vertex2D, s));
+    glVertexAttribPointer(2, 1, GL_FLOAT, GL_FALSE, sizeof(Vertex2D), (void*)offsetof(Vertex2D, layer));
+
+    glEnableVertexAttribArray(0);
+    glEnableVertexAttribArray(1);
+    glEnableVertexAttribArray(2);
+
+    glActiveTexture(GL_TEXTURE0);
+    glBindTexture(GL_TEXTURE_2D_ARRAY, m_texture_manager.get_ui_array());
+
+    glDrawArrays(GL_TRIANGLES, 0, 6);
+    Shader::check_opengl_error();
+    glBindBuffer(GL_ARRAY_BUFFER, 0);
+
+    glEnable(GL_DEPTH_TEST);
+
+}
+
+void Renderer::update_proj_matrix(float aspect, float width, float height) {
     m_p_mat = glm::perspective(glm::radians(FOV), aspect, 0.1f, 1000.0f); 
+    m_ui_proj = glm::ortho(0.0f, width, height, 0.0f, -1.0f, 1.0f);
+    // scale and then translate
+    m_ui_m_matrix = glm::translate(glm::mat4(1.0f), glm::vec3(width / 2.0f, height / 2.0f, 0.0)) *
+                glm::scale(glm::mat4(1.0f), glm::vec3(50.0f, 50.0f, 1.0f));
+    
 }

src/shaders/ui_f_shader.glsl

@@ -0,0 +1,12 @@
+#version 460
+
+in vec2 tc;
+flat in int tex_layer;
+
+out vec4 color;
+
+layout (binding = 0) uniform sampler2DArray samp;
+
+void main(void) {
+    color = texture(samp, vec3(tc, tex_layer));
+}

src/shaders/ui_v_shader.glsl

@@ -0,0 +1,18 @@
+#version 460
+
+layout (location = 0) in vec2 pos;
+layout (location = 1) in vec2 texCoord;
+layout (location = 2) in float layer;
+
+out vec2 tc;
+
+flat out int tex_layer;
+
+uniform mat4 m_matrix;
+uniform mat4 proj_matrix;
+
+void main(void) {
+    gl_Position = proj_matrix * m_matrix * vec4(pos, 0.0, 1.0);
+    tc = texCoord;
+    tex_layer = int(layer);
+}

src/texture_manager.cpp

@@ -17,14 +17,19 @@ void TextureManager::delet_texture() {
     LOG::info("Successfully delete all texture");
 }
 
-GLuint TextureManager::get_block_status_array() {
+GLuint TextureManager::get_block_status_array() const{
     return m_block_status_array;
 }
 
-GLuint TextureManager::get_texture_array() {
+GLuint TextureManager::get_texture_array() const{
     return m_texture_array;
 }
-void TextureManager::load_block_status(int id) {
+
+GLuint TextureManager::get_ui_array() const{
+    return m_ui_array;
+}
+
+void TextureManager::load_block_status(unsigned id) {
 
     CUBED_ASSERT_MSG(id < MAX_BLOCK_STATUS, "Exceed the max status sum limit");
     std::string path = "assets/texture/status/" + std::to_string(id) + ".png";
@@ -39,6 +44,7 @@ void TextureManager::load_block_status(int id) {
                     );
     Shader::delete_image_data(image_data);
 }
+
 void TextureManager::load_block_texture(unsigned id) {
     CUBED_ASSERT_MSG(id < MAX_BLOCK_NUM, "Exceed the max block sum limit");
     const std::string& name = MapTable::get_name_from_id(id);
@@ -71,6 +77,23 @@ void TextureManager::load_block_texture(unsigned id) {
 
 }
 
+void TextureManager::load_ui_texture(unsigned id) {
+    CUBED_ASSERT_MSG(id < MAX_UI_NUM, "Exceed the max ui sum limit");
+
+    std::string path = "assets/texture/ui/" + std::to_string(id) + ".png";
+    unsigned char* image_data = nullptr;
+    image_data = (Shader::load_image_data(path));
+    glBindTexture(GL_TEXTURE_2D_ARRAY, m_ui_array);
+    glTexSubImage3D(GL_TEXTURE_2D_ARRAY, 0,
+                        0 ,0, id,
+                        16, 16, 1,
+                        GL_RGBA, GL_UNSIGNED_BYTE,
+                        image_data
+                    );
+    Shader::delete_image_data(image_data);
+
+}
+
 void TextureManager::init_texture() {
 
     MapTable::init_map();
@@ -133,6 +156,26 @@ void TextureManager::init_texture() {
     if (max_aniso > 0.0f) {
         LOG::info("Support anisotropic filtering max_aniso is {}", max_aniso);
         glTexParameterf(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_MAX_ANISOTROPY, max_aniso);
-    }    
+    }
+    
+    glGenTextures(1, &m_ui_array);
+    Shader::check_opengl_error();
+    glBindTexture(GL_TEXTURE_2D_ARRAY, m_ui_array);
+    Shader::check_opengl_error();
+    glTexImage3D(GL_TEXTURE_2D_ARRAY,
+        0, GL_RGBA,
+        16, 16,
+        MAX_UI_NUM,
+        0, GL_RGBA,
+        GL_UNSIGNED_BYTE, nullptr);
+    Shader::check_opengl_error();
+    for (int i = 0; i < MAX_UI_NUM; i++) {
+        load_ui_texture(i);
+    }
+
+    glBindTexture(GL_TEXTURE_2D_ARRAY, m_ui_array);
+    glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+    glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_MIN_FILTER, GL_NEAREST); 
+
 
 }

src/window.cpp

@@ -27,7 +27,7 @@ void Window::update_viewport() {
     glfwGetFramebufferSize(m_window, &m_width, &m_height);
     m_aspect = (float)m_width / (float)m_height;
     glViewport(0, 0, m_width, m_height);
-    m_renderer.update_proj_matrix(m_aspect);
+    m_renderer.update_proj_matrix(m_aspect, m_width, m_height) ;
 
 }