engineer-thesis-WUT/Engine/engine/constants.hpp

// "Copyright [2023] <Krzysztof Rudnicki>"
#ifndef ENGINE_ENGINE_CONSTANTS_HPP_
#define ENGINE_ENGINE_CONSTANTS_HPP_
#include <GLFW/glfw3.h>
#include <iostream>
#include <string_view>


namespace constants {
    inline constexpr int GLFW_MAJOR_VERSION { 3 };
    inline constexpr int GLFW_MINOR_VERSION { 3 };
    // best practice is to use inline constexpr
    // std::string_view but glfwCreateWindow takes only char* as input
    inline const char* MAIN_WINDOW_NAME { "Match" };
    inline constexpr int MAIN_WINDOW_WIDTH { 800 };
    inline constexpr int MAIN_WINDOW_HEIGHT { 600 };
    inline constexpr struct  {
        GLfloat red = 1.0f;
        GLfloat green = 0.0f;
        GLfloat blue = 0.0f;
        GLfloat alpha = 1.0f;
    } RED;

    inline constexpr struct  {
        GLfloat red = 1.0f;
        GLfloat green = 1.0f;
        GLfloat blue = 1.0f;
        GLfloat alpha = 1.0f;
    } WHITE;

    inline constexpr struct  {
        GLfloat red = 0.2f;
        GLfloat green = 0.3f;
        GLfloat blue = 0.3f;
        GLfloat alpha = 1.0f;
    } LEARN_OPEN_GL_COLOR;

    inline const char*  VERTEX_SHADER_COLOR_FILENAME {
        "./Shaders/vertexShaderColor.vs"
    };

    inline const char* VERTEX_SHADER_UPSIDE_DOWN_FILENAME {
        "./Shaders/vertexShaderUpsideDown.vs"
    };

        inline const char* VERTEX_SHADER_OFFSET_FILENAME {
        "./Shaders/vertexShaderOffset.vs"
    };
    // we write vertex shader
    // version of glsl (since ogl 3.3 same as ogl so we pick 330)
    // in this shader we just forward input data to shader output
    // DO NOT REMOVE UNTIL CAN DRAW SQUARE USING CLASS
    inline const char *VERTEX_SHADER_SOURCE { "#version 330 core\n"
    "layout (location = 0) in vec3 aPos;\n"
    "void main()\n"
    "{\n"
    "   gl_Position = vec4(aPos.x, aPos.y, aPos.z, 1.0);\n"
    "}\0" };
    inline const char* VERTEX_SHADER_SOURCE_FILENAME {
        "./Shaders/vertexShaderSource.vs"
    };

    inline const char*  VERTEX_SHADER_VERTICE_COLOR_FILENAME {
        "./Shaders/vertexShaderVerticeColor.vs"
    };

    inline const char* VERTEX_SHADER_TASK_THREE_FILENAME {
        "./Shaders/vertexShaderTaskThree.vs"
    };

    inline const char* VERTEX_SHADER_TEXTURE_FILENAME {
        "./Shaders/vertexShaderTexture.vs"
    };

    inline const char* FRAGMENT_SHADER_TASK_THREE_FILENAME {
        "./Shaders/fragmentShaderTaskThree.fs"
    };

    inline const char*  FRAGMENT_SHADER_COLOR_FROM_VERTEX_FILENAME {
        "./Shaders/fragmentShaderColorFromVertex.fs"
    };

    inline const char*  FRAGMENT_SHADER_UNIFORMS_FILENAME {
        "./Shaders/fragmentShaderUniforms.fs"
    };

    // write fragment shader
    // we set the color of each pixel to be orange
    // DO NOT REMOVE UNTIL CAN DRAW SQUARE USING CLASS
    inline const char *FRAGMENT_SHADER_SOURCE {
        "#version 330 core\n"
        "out vec4 FragColor;\n"
        "void main()\n"
        "{\n"
            "FragColor = vec4(1.0f, 0.5f, 0.2f, 1.0f);\n"
        "}\0"
    };

    inline const char*  FRAGMENT_SHADER_SOURCE_FILENAME {
        "./Shaders/fragmentShaderSource.fs"
    };
    inline const char*  FRAGMENT_SHADER_SOURCE_YELLOW_FILENAME {
        "./Shaders/fragmentShaderSourceYellow.fs"
    };

    inline const char* FRAGMENT_SHADER_TEXTURE_FILENAME {
        "./Shaders/fragmentShaderTexture.fs"
    };

    // we specify three vertices
    // each of them with position in 3d space
    // x y z
    inline constexpr float TRIANGLE_VERTICES[] {
        -0.5f, -0.5f, 0.0f,
        0.5f, -0.5f, 0.0f,
        0.0f,  0.5f, 0.0f
    };

    inline constexpr size_t TRIANGLE_VERTICES_SIZE = {
        sizeof(TRIANGLE_VERTICES)
        };

    inline constexpr float TRIANGLES_VERTICES[] {
        // first triangle
        -0.9f, -0.5f, 0.0f,  // left
        -0.0f, -0.5f, 0.0f,  // right
        -0.45f, 0.5f, 0.0f,  // top
        // second triangle
         0.0f, -0.5f, 0.0f,  // left
         0.9f, -0.5f, 0.0f,  // right
         0.45f, 0.5f, 0.0f   // top
    };

    inline constexpr size_t TRIANGLES_VERTICES_SIZE = {
        sizeof(TRIANGLES_VERTICES) };

    inline constexpr float TRIANGLE_ONE[] {
        // first triangle
        -0.9f, -0.5f, 0.0f,  // left
        -0.0f, -0.5f, 0.0f,  // right
        -0.45f, 0.5f, 0.0f,  // top
    };

    inline constexpr size_t TRIANGLE_ONE_SIZE = { sizeof(TRIANGLE_ONE) };

    inline constexpr float TRIANGLE_TWO[] {
        // second triangle
         0.0f, -0.5f, 0.0f,  // left
         0.9f, -0.5f, 0.0f,  // right
         0.45f, 0.5f, 0.0f   // top
    };

    inline constexpr size_t TRIANGLE_TWO_SIZE = { sizeof(TRIANGLE_TWO) };

    inline constexpr float TRIANGLE_COLORS[] {
        // positions         // colors
        0.5f, -0.5f, 0.0f,  1.0f, 0.0f, 0.0f,   // bottom right
        -0.5f, -0.5f, 0.0f,  0.0f, 1.0f, 0.0f,   // bottom left
        0.0f,  0.5f, 0.0f,  0.0f, 0.0f, 1.0f    // top
    };

    inline constexpr size_t TRIANGLE_COLORS_SIZE = { sizeof(TRIANGLE_COLORS) };

    // compare with square done with only vertices:
    /*
    float vertices[] = {
    // first triangle
     0.5f,  0.5f, 0.0f,  // top right
     0.5f, -0.5f, 0.0f,  // bottom right
    -0.5f,  0.5f, 0.0f,  // top left 
    // second triangle
     0.5f, -0.5f, 0.0f,  // bottom right
    -0.5f, -0.5f, 0.0f,  // bottom left
    -0.5f,  0.5f, 0.0f   // top left
    };
    bottom right and top left is specified twice ! 
    */
    inline constexpr float SQUARE_VERTICES[] {
        0.5f,  0.5f, 0.0f,  // top right
        0.5f, -0.5f, 0.0f,  // bottom right
        -0.25f, -0.5f, 0.0f,  // bottom left
        -0.25f,  0.5f, 0.0f   // top left
    };

    inline constexpr unsigned int SQUARE_INDICES[] {
        0, 1, 3,   // first triangle
        1, 2, 3,    // second triangle
    };

    inline constexpr size_t SQUARE_INDICES_SIZE = { sizeof(SQUARE_INDICES) };

    inline constexpr size_t SQUARE_VERTICES_SIZE = { sizeof(SQUARE_VERTICES) };

    inline constexpr int MAX_DRAW_CALL = { 11 };

    // https://learnopengl.com/img/getting-started/tex_coords.png
    inline constexpr float TEXTURE_VERTICES[] {
        // positions          // colors           // texture coords
         0.5f,  0.5f, 0.0f,   1.0f, 0.0f, 0.0f,   1.0f, 1.0f,  // top right
         0.5f, -0.5f, 0.0f,   0.0f, 1.0f, 0.0f,   1.0f, 0.0f,  // bottom right
        -0.5f, -0.5f, 0.0f,   0.0f, 0.0f, 1.0f,   0.0f, 0.0f,  // bottom left
        -0.5f,  0.5f, 0.0f,   1.0f, 1.0f, 0.0f,   0.0f, 1.0f   // top left
    };

    inline constexpr size_t TEXTURE_VERTICES_SIZE = {
        sizeof(TEXTURE_VERTICES)
        };


    inline constexpr unsigned int TEXTURE_INDICES[] {
        0, 1, 3,  // first triangle
        1, 2, 3   // second triangle
    };

    inline constexpr size_t TEXTURE_INDICES_SIZE = { sizeof(TEXTURE_INDICES) };
}  // namespace constants

#endif  // ENGINE_ENGINE_CONSTANTS_HPP_