qtk/lib/mesh.cpp

/*##############################################################################
## Author: Shaun Reed                                                         ##
## Legal: All Content (c) 2022 Shaun Reed, all rights reserved                ##
## About: Collection of static mesh data for quick initialization             ##
##                                                                            ##
## Contact: shaunrd0@gmail.com  | URL: www.shaunreed.com | GitHub: shaunrd0   ##
##############################################################################*/

#include <mesh.h>


Cube::Cube(DrawMode mode)
{
  mDrawMode = mode;
  switch(mode) {
    // Cube data for use with glDrawArrays
    case QTK_DRAW_ARRAYS:
      mIndices = { /* No indices needed for glDrawArrays */ };

      mNormals =
          {FACE_FRONT, FACE_BACK, FACE_TOP, FACE_BOTTOM, FACE_LEFT, FACE_RIGHT};

      mVertices = {
          // Face 1 (Front)
          VERTEX_FTR, VERTEX_FTL, VERTEX_FBL,
          VERTEX_FBL, VERTEX_FBR, VERTEX_FTR,
          // Face 2 (Back)
          VERTEX_BBR, VERTEX_BTL, VERTEX_BTR,
          VERTEX_BTL, VERTEX_BBR, VERTEX_BBL,
          // Face 3 (Top)
          VERTEX_FTR, VERTEX_BTR, VERTEX_BTL,
          VERTEX_BTL, VERTEX_FTL, VERTEX_FTR,
          // Face 4 (Bottom)
          VERTEX_FBR, VERTEX_FBL, VERTEX_BBL,
          VERTEX_BBL, VERTEX_BBR, VERTEX_FBR,
          // Face 5 (Left)
          VERTEX_FBL, VERTEX_FTL, VERTEX_BTL,
          VERTEX_FBL, VERTEX_BTL, VERTEX_BBL,
          // Face 6 (Right)
          VERTEX_FTR, VERTEX_FBR, VERTEX_BBR,
          VERTEX_BBR, VERTEX_BTR, VERTEX_FTR
      };

      mColors = {
          // Face 1 (Front)
          RED, GREEN, BLUE,
          BLUE, WHITE, RED,
          // Face 2 (Back)
          YELLOW, CYAN, MAGENTA,
          CYAN, YELLOW, BLACK,
          // Face 3 (Top)
          RED, MAGENTA, CYAN,
          CYAN, GREEN, RED,
          // Face 4 (Bottom)
          WHITE, BLUE, BLACK,
          BLACK, YELLOW, WHITE,
          // Face 5 (Left)
          BLUE, GREEN, CYAN,
          BLUE, CYAN, BLACK,
          // Face 6 (Right)
          RED, WHITE, YELLOW,
          YELLOW, MAGENTA, RED
      };

      mTexCoords = {
          // Face 1 (Front)
          UV_TOP, UV_ORIGIN, UV_RIGHT,
          UV_RIGHT, UV_CORNER, UV_TOP,
          // Face 2 (Back)
          UV_TOP, UV_RIGHT, UV_CORNER,
          UV_RIGHT, UV_TOP, UV_ORIGIN,
          // Face 3 (Top)
          UV_CORNER, UV_TOP, UV_ORIGIN,
          UV_ORIGIN, UV_RIGHT, UV_CORNER,
          // Face 4 (Bottom)
          UV_TOP, UV_ORIGIN, UV_RIGHT,
          UV_RIGHT, UV_CORNER, UV_TOP,
          // Face 5 (Left)
          UV_TOP, UV_CORNER, UV_RIGHT,
          UV_TOP, UV_RIGHT, UV_ORIGIN,
          // Face 6 (Right)
          UV_TOP, UV_CORNER, UV_RIGHT,
          UV_RIGHT, UV_ORIGIN, UV_TOP
      };

      break;


      // Cube data for use with glDrawElements
    case QTK_DRAW_ELEMENTS:
      mNormals =
          {/* For normals and glDrawElements, see QTK_DRAW_ELEMENTS_NORMALS */};
      mTexCoords =
          { /* For UVs and glDrawElements, see QTK_DRAW_ELEMENTS_NORMALS */ };

      mColors = {RED, GREEN, BLUE, WHITE, YELLOW, CYAN, MAGENTA, BLACK};

      mVertices = {
          //       0           1           2           3
          VERTEX_FTR, VERTEX_FTL, VERTEX_FBL, VERTEX_FBR,
          //       4           5           6           7
          VERTEX_BTR, VERTEX_BTL, VERTEX_BBL, VERTEX_BBR
      };
      mIndices = {
          // Face 1 (Front)
          0, 1, 2,    2, 3, 0,
          // Face 2 (Back)
          7, 5, 4,    5, 7, 6,
          // Face 3 (Top)
          0, 4, 5,    5, 1, 0,
          // Face 4 (Bottom)
          3, 2, 6,    6, 7, 3,
          // Face 5 (Left)
          2, 1, 5,    2, 5, 6,
          // Face 6 (Right)
          0, 3, 7,    7, 4, 0
      };
      break;

      // Cube shape data for using normals and UVs with glDrawElements
    case QTK_DRAW_ELEMENTS_NORMALS:
      mColors = {RED, GREEN, BLUE, WHITE, YELLOW, CYAN, MAGENTA, BLACK};

      mVertices = {
          // Face 1 (Front)
          //       0           1           2           3
          VERTEX_FTL, VERTEX_FBL, VERTEX_FBR, VERTEX_FTR,
          // Face 2 (Back)
          //       4           5           6           7
          VERTEX_BTL, VERTEX_BBL, VERTEX_BBR, VERTEX_BTR,
          // Face 3 (Top)
          //       8           9          10          11
          VERTEX_FTL, VERTEX_BTL, VERTEX_BTR, VERTEX_FTR,
          // Face 4 (Bottom)
          //      12          13          14          15
          VERTEX_FBL, VERTEX_BBL, VERTEX_BBR, VERTEX_FBR,
          // Face 5 (Left)
          //      16          17          18          19
          VERTEX_FBL, VERTEX_BBL, VERTEX_BTL, VERTEX_FTL,
          // Face 6 (Right)
          //      20          21          22          23
          VERTEX_FBR, VERTEX_BBR, VERTEX_BTR, VERTEX_FTR
      };

      mIndices = {
          // Face 1 (Front)
          0, 1, 2,    2, 3, 0,
          // Face 2 (Back)
          4, 5, 6,    6, 7, 4,
          // Face 3 (Top)
          8, 9, 10,    10, 11, 8,
          // Face 4 (Bottom)
          12, 13, 14,    14, 15, 12,

          // Face 5 (Left)
          16, 17, 18,    18, 19, 16,
          // Face 6 (Right)
          20, 21, 22,    22, 23, 20
      };

      mNormals = {
          VECTOR_FORWARD, VECTOR_FORWARD, VECTOR_FORWARD, VECTOR_FORWARD,
          VECTOR_BACK, VECTOR_BACK, VECTOR_BACK, VECTOR_BACK,
          VECTOR_UP, VECTOR_UP, VECTOR_UP, VECTOR_UP,
          VECTOR_DOWN, VECTOR_DOWN, VECTOR_DOWN, VECTOR_DOWN,
          VECTOR_LEFT, VECTOR_LEFT, VECTOR_LEFT, VECTOR_LEFT,
          VECTOR_RIGHT, VECTOR_RIGHT, VECTOR_RIGHT, VECTOR_RIGHT,
      };

      mTexCoords = {
          // Face 1 (Front)
          UV_TOP, UV_RIGHT, UV_CORNER,
          UV_RIGHT, UV_TOP, UV_ORIGIN,
          // Face 2 (Back)
          UV_TOP, UV_RIGHT, UV_CORNER,
          UV_RIGHT, UV_TOP, UV_ORIGIN,
          // Face 3 (Top)
          UV_TOP, UV_RIGHT, UV_CORNER,
          UV_RIGHT, UV_TOP, UV_ORIGIN,
          // Face 4 (Bottom)
          UV_TOP, UV_RIGHT, UV_CORNER,
          UV_RIGHT, UV_TOP, UV_ORIGIN,
          // Face 5 (Left)
          UV_TOP, UV_RIGHT, UV_CORNER,
          UV_RIGHT, UV_TOP, UV_ORIGIN,
          // Face 6 (Right)
          UV_TOP, UV_RIGHT, UV_CORNER,
          UV_RIGHT, UV_TOP, UV_ORIGIN,
      };

      break;
  }
}

Triangle::Triangle(DrawMode mode)
{
  mDrawMode = mode;
  const QVector3D triangleTop = QVector3D(0.0f, 0.5f, 0.0f);
  switch(mode) {
    case QTK_DRAW_ARRAYS:
      mIndices = { /* No indices needed for glDrawArrays */ };

      mColors = { RED, GREEN, BLUE, WHITE, YELLOW, CYAN, MAGENTA, BLACK };

      mVertices = {
          // Bottom face (Base of the pyramid)
          VERTEX_BBL, VERTEX_BBR, VERTEX_FBR,
          VERTEX_FBR, VERTEX_FBL, VERTEX_BBL,

          // Front face
          VERTEX_FBL, VERTEX_FBR, triangleTop,
          // Back face
          VERTEX_BBR, VERTEX_BBL, triangleTop,
          // Left face
          VERTEX_BBL, VERTEX_FBL, triangleTop,
          // Right face
          VERTEX_FBR, VERTEX_BBR, triangleTop,
      };

      // Find normals for each triangle of the mesh
      for (int i = 0; i < mVertices.size(); i += 3) {
        QVector3D vertexNormal =
            QVector3D::normal(mVertices[i], mVertices[i+1], mVertices[i+2]);
        // Three points share this normal
        for (int j = 0; j < 3; j++) {
          mNormals.push_back(vertexNormal);
        }
      }

      mTexCoords = {
          // Bottom face (Base of the pyramid)
          UV_ORIGIN, UV_RIGHT, UV_CORNER,
          UV_CORNER, UV_TOP, UV_ORIGIN,

          // Front face
          UV_ORIGIN, UV_RIGHT, UV_CORNER,
          // Back face
          UV_ORIGIN, UV_RIGHT, UV_CORNER,
          // Left face
          UV_ORIGIN, UV_RIGHT, UV_CORNER,
          // Right face
          UV_ORIGIN, UV_RIGHT, UV_CORNER,
      };

      break;

      // Triangle shape data for using glDrawElements
    case QTK_DRAW_ELEMENTS:
      mColors = { RED, GREEN, BLUE, WHITE, YELLOW, CYAN, MAGENTA, BLACK };

      mVertices = {VERTEX_FBL, VERTEX_FBR, VERTEX_BBL, VERTEX_BBR, triangleTop};

      mIndices = {
          // Bottom face (Base of the pyramid)
          2, 3, 1, // Use customVertexes[2], then 3, 1...
          1, 0, 2, // Use customVertexes[1], then 0, 2

          0, 1, 4, // Front face
          3, 2, 4, // Back face
          2, 0, 4, // Left face
          1, 3, 4, // Right face
      };

      mNormals =
          {/* Use QTK_DRAW_ELEMENTS_NORMALS for normals with glDrawElements */};

      mTexCoords = { /* No UVs for triangle with glDrawElements */ };

      break;

      // Triangle shape data for using normals and UVs with glDrawElements
    case QTK_DRAW_ELEMENTS_NORMALS:
      mColors = { RED, GREEN, BLUE, WHITE, YELLOW, CYAN, MAGENTA, BLACK };

      mVertices = {
          // Bottom face
          //       0           1           2
          VERTEX_FBL, VERTEX_FBR, VERTEX_BBL,
          //       3            4          5
          VERTEX_BBR, VERTEX_FBR, VERTEX_BBL,

          // Front face
          //       6           7           8
          VERTEX_FBL, VERTEX_FBR, triangleTop,
          // Back face
          //       9           10        11
          VERTEX_BBR, VERTEX_BBL, triangleTop,
          // Left face
          //      12          13          14
          VERTEX_BBL, VERTEX_FBL, triangleTop,
          // Right face
          //      15           16         17
          VERTEX_FBR, VERTEX_BBR, triangleTop,
      };

      mIndices = {
          // Bottom face (Base of the pyramid)
          0, 1, 2, // Use customVertexes[2], then 3, 1...
          3, 4, 5, // Use customVertexes[1], then 0, 2

          6, 7, 8, // Front face
          9, 10, 11, // Back face
          12, 13, 14, // Left face
          15, 16, 17, // Right face
      };

      // Find normals for each triangle of the mesh
      for (int i = 0; i < mVertices.size(); i += 3) {
        QVector3D vertexNormal =
            QVector3D::normal(mVertices[mIndices[i]],
                              mVertices[mIndices[i+1]],
                              mVertices[mIndices[i+2]]);
        // Three points share this normal
        for (int j = 0; j < 3; j++) {
          mNormals.push_back(vertexNormal);
        }
      }

      mTexCoords = {
          // Bottom face
          UV_ORIGIN, UV_RIGHT, UV_TOP,
          UV_CORNER, UV_RIGHT, UV_TOP,

          // Front face
          UV_ORIGIN, UV_RIGHT, UV_CORNER,
          // Back face
          UV_ORIGIN, UV_RIGHT, UV_CORNER,
          // Left face
          UV_ORIGIN, UV_RIGHT, UV_CORNER,
          // Right face
          UV_ORIGIN, UV_RIGHT, UV_CORNER,
      };
      break;
  }

}