feat: pbr (#20)

* feat: add pbr texture

* feat(rendering): add normal mapping support for blocks

* fix: normal map load

* feat(scripts): add batch nearest neighbor upscale script

include/Cubed/primitive_data.hpp

@@ -136,6 +136,50 @@ constexpr float NORMALS[6][6][3] = {
      {0.0f, -1.0f, 0.0f},
      {0.0f, -1.0f, 0.0f}}};
 
+constexpr float TANGENTS[6][6][3] = {
+    // ===== front (z = +1) =====
+    {{1.0f, 0.0f, 0.0f},
+     {1.0f, 0.0f, 0.0f},
+     {1.0f, 0.0f, 0.0f},
+     {1.0f, 0.0f, 0.0f},
+     {1.0f, 0.0f, 0.0f},
+     {1.0f, 0.0f, 0.0f}},
+    // ===== right (x = +1) =====
+    {{0.0f, 0.0f, -1.0f},
+     {0.0f, 0.0f, -1.0f},
+     {0.0f, 0.0f, -1.0f},
+     {0.0f, 0.0f, -1.0f},
+     {0.0f, 0.0f, -1.0f},
+     {0.0f, 0.0f, -1.0f}},
+    // ===== back (z = -1) =====
+    {{-1.0f, 0.0f, 0.0f},
+     {-1.0f, 0.0f, 0.0f},
+     {-1.0f, 0.0f, 0.0f},
+     {-1.0f, 0.0f, 0.0f},
+     {-1.0f, 0.0f, 0.0f},
+     {-1.0f, 0.0f, 0.0f}},
+    // ===== left (x = -1) =====
+    {{0.0f, 0.0f, 1.0f},
+     {0.0f, 0.0f, 1.0f},
+     {0.0f, 0.0f, 1.0f},
+     {0.0f, 0.0f, 1.0f},
+     {0.0f, 0.0f, 1.0f},
+     {0.0f, 0.0f, 1.0f}},
+    // ===== top (y = +1) =====
+    {{1.0f, 0.0f, 0.0f},
+     {1.0f, 0.0f, 0.0f},
+     {1.0f, 0.0f, 0.0f},
+     {1.0f, 0.0f, 0.0f},
+     {1.0f, 0.0f, 0.0f},
+     {1.0f, 0.0f, 0.0f}},
+    // ===== bottom (y = -1) =====
+    {{1.0f, 0.0f, 0.0f},
+     {1.0f, 0.0f, 0.0f},
+     {1.0f, 0.0f, 0.0f},
+     {1.0f, 0.0f, 0.0f},
+     {1.0f, 0.0f, 0.0f},
+     {1.0f, 0.0f, 0.0f}}};
+
 #pragma endregion
 constexpr float CUBE_VER[24] = {0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 1.0, 1.0,
                                 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 1.0, 1.0,
@@ -211,6 +255,22 @@ constexpr float CROSS_NORMALS[2][6][3] = {
      {0.0f, 1.0f, 0.0f},
      {0.0f, 1.0f, 0.0f}}};
 
+constexpr float CROSS_TANGENTS[2][6][3] = {
+    // ===== Plane 1 =====
+    {{0.7071f, 0.0f, 0.7071f},
+     {0.7071f, 0.0f, 0.7071f},
+     {0.7071f, 0.0f, 0.7071f},
+     {0.7071f, 0.0f, 0.7071f},
+     {0.7071f, 0.0f, 0.7071f},
+     {0.7071f, 0.0f, 0.7071f}},
+    // ===== Plane 2 =====
+    {{-0.7071f, 0.0f, 0.7071f},
+     {-0.7071f, 0.0f, 0.7071f},
+     {-0.7071f, 0.0f, 0.7071f},
+     {-0.7071f, 0.0f, 0.7071f},
+     {-0.7071f, 0.0f, 0.7071f},
+     {-0.7071f, 0.0f, 0.7071f}}};
+
 #pragma endregion
 // [-1, 1]
 constexpr float QUAD_VERTICES[] = {
@@ -225,6 +285,7 @@ struct Vertex3D {
     float layer = 0.0f;
     float nx = 0.0f, ny = 0.0f, nz = 0.0f;
     float roughness = 1.0f;
+    float tx = 0.0f, ty = 0.0f, tz = 0.0f;
 };
 
 struct Vertex2D {

include/Cubed/renderer.hpp

@@ -34,6 +34,8 @@ public:
     bool& shader_on();
     bool& water_perturb();
     bool& water_depth_fade();
+    bool& pbr();
+    bool& flip_y();
     int& shadow_mode();
     int& light_cull_face();
     int& light_size_uv();
@@ -95,6 +97,8 @@ private:
     bool m_shader_on = true;
     bool m_water_perturb = true;
     bool m_water_depth_fade = true;
+    bool m_pbr = true;
+    bool m_flip_y = false;
     int m_shadow_mode = 0;
     int m_light_cull_face = 0;
     float m_aspect = 0.0f;

include/Cubed/texture_manager.hpp

@@ -12,7 +12,9 @@ private:
     GLuint m_texture_array = 0;
     GLuint m_cross_plane_array = 0;
     GLuint m_ui_array = 0;
+    GLuint m_pbr_texture_array = 0;
     GLfloat m_max_aniso = 0.0f;
+
     int m_aniso = 1;
 
     std::vector<GLuint> m_item_textures;
@@ -22,6 +24,7 @@ private:
     void load_block_item_texture(unsigned id);
     void load_cross_plane_texture(unsigned id);
     void load_ui_texture(unsigned id);
+    void load_pbr_texture(unsigned id);
     void init_item();
     void init_block();
     void init_ui();
@@ -36,6 +39,7 @@ public:
     GLuint get_texture_array() const;
     GLuint get_cross_plane_array() const;
     GLuint get_ui_array() const;
+    GLuint get_pbr_texture() const;
     const std::vector<GLuint>& item_textures() const;
     // Must call after MapTable::init_map() and glfwMakeContextCurrent(window);
     void init_texture();

include/Cubed/tools/shader_tools.hpp

@@ -14,7 +14,8 @@ void print_program_info(int prog);
 bool check_opengl_error();
 std::string read_shader_source(const std::string& file_path);
 void delete_image_data(unsigned char* data);
-unsigned char* load_image_data(const std::string& tex_image_path);
+unsigned char* load_image_data(const std::string& tex_image_path,
+                               bool check_exist = true);
 
 } // namespace Tools