add horse

.gitignore

@@ -1 +1,2 @@
 build
+progress

src/donut.cpp

@@ -1,32 +1,34 @@
 // Alexander Bass
 // Created 4/16/24
+// Modified 4/17/24
 
 #include "donut.h"
 #include "point.h"
 #include "types.h"
 #include <vector>
 
-#include "rgb.h"
+#include "vec3.h"
 
-rgb sample_rgb(u8 *texture, usize index) {
+vec3 sample_rgb(u8 *texture, usize index) {
-    u8 d_red = texture[index * 3];
+    u8 red = texture[index];
-    u8 d_green = texture[index * 3 + 1];
+    u8 green = texture[index + 1];
-    u8 d_blue = texture[index * 3 + 2];
+    u8 blue = texture[index + 2];
-    f64 d_r = (f64)d_red / 255.0;
+    vec3 color = vec3((f64)red, (f64)green, (f64)blue);
-    f64 d_g = (f64)d_green / 255.0;
+    color *= vec3(1.0 / 255.0, 1.0 / 255.0, 1.0 / 255.0);
-    f64 d_b = (f64)d_blue / 255.0;
+    return color;
-    return rgb(d_r, d_g, d_b);
 };
 
-inline rgb mix_transparency(rgb transparent, rgb solid) {
+inline vec3 mix_transparency(vec3 transparent, vec3 solid) {
-    if (transparent.r == 0.0 && transparent.g == 0.0 && transparent.b == 0.0) {
+    if (transparent.i == 0.0 && transparent.j == 0.0 && transparent.k == 0.0) {
         return solid;
-    }
+    } else {
         return transparent;
+    }
 }
 
 std::vector<Point> generate_cube(u8 *bottom_texture, u8 *top_texture, u8 *side_texture, i32 face_x, i32 face_y) {
     std::vector<Point> out = {};
+    const vec3 grass_color_scale = vec3(0.4, 1.0, 0.4);
     const usize image_size = 16;
     const usize point_count = 22;
     const usize world_width = 16;
@@ -35,46 +37,45 @@ std::vector<Point> generate_cube(u8 *bottom_texture, u8 *top_texture, u8 *side_t
 
             f64 sx = (f64)l_x / (f64)point_count;
             f64 sy = (f64)l_y / (f64)point_count;
-            usize index = (usize)(sx * (f64)(image_size)) + usize(sy * (f64)(image_size)) * image_size;
+            usize index = 3 * ((usize)(sx * (f64)(image_size)) + usize(sy * (f64)(image_size)) * image_size);
-            rgb dirt = sample_rgb(bottom_texture, index);
+            vec3 dirt = sample_rgb(bottom_texture, index);
-            rgb grass = sample_rgb(top_texture, index);
+            vec3 grass = sample_rgb(top_texture, index);
-            rgb sides = sample_rgb(side_texture, index);
+            vec3 side = sample_rgb(side_texture, index);
-            grass.mix(rgb(0.4, 1.0, 0.4));
+            grass *= grass_color_scale;
-            sides.mix(rgb(0.4, 1.0, 0.4));
+            side *= grass_color_scale;
 
-            sides = mix_transparency(sides, dirt);
+            side = mix_transparency(side, dirt);
 
             f64 x_w = sx * (f64)world_width;
             f64 y_w = sy * (f64)world_width;
             f64 w_w = (f64)world_width;
 
             if (face_y == -1 || (face_y == 1 && face_x == 0)) {
-                out.push_back(*Point(x_w, 0, y_w).set_rgb(sides));
+                out.push_back(*Point(x_w, 0, y_w).set_rgb(side));
             }
             if (face_x == -1 || (face_x == 1 && face_y == 0)) {
-                out.push_back(*Point(0, x_w, y_w).set_rgb(sides));
+                out.push_back(*Point(0, x_w, y_w).set_rgb(side));
             }
             if (face_x == 1 || (face_x == -1 && face_y == 0)) {
-                out.push_back(*Point(w_w, x_w, y_w).set_rgb(sides));
+                out.push_back(*Point(w_w, x_w, y_w).set_rgb(side));
             }
             if (face_y == 1 || (face_y == -1 && face_x == 0)) {
-                out.push_back(*Point(x_w, w_w, y_w).set_rgb(sides));
+                out.push_back(*Point(x_w, w_w, y_w).set_rgb(side));
             }
 
             out.push_back(*Point(x_w, y_w, w_w).set_rgb(dirt));
             out.push_back(*Point(x_w, y_w, 0.0).set_rgb(grass));
         }
     }
-    for (usize i = 0; i < out.size(); i++) {
+    for (auto &p : out) {
-        Point *p = &out[i];
+        p.translate_x((f64)face_x * (f64)world_width - (f64)world_width / 2.0);
-        p->translate_x((f64)face_x * (f64)world_width - (f64)world_width / 2.0);
+        p.translate_y((f64)face_y * (f64)world_width - (f64)world_width / 2.0);
-        p->translate_y((f64)face_y * (f64)world_width - (f64)world_width / 2.0);
+        p.translate_z(-(f64)world_width / 2.0);
-        p->translate_z(-(f64)world_width / 2.0);
     }
     return out;
 }
 
-std::vector<Point> generate_donut(u8 *bottom_texture, u8 *top_texture, u8 *side_texture, f64 offset) {
+std::vector<Point> generate_donut(u8 *bottom_texture, u8 *top_texture, u8 *side_texture) {
     std::vector<Point> points = {};
     for (i32 x = -1; x <= 1; x++) {
         for (i32 y = -1; y <= 1; y++) {
@@ -85,10 +86,6 @@ std::vector<Point> generate_donut(u8 *bottom_texture, u8 *top_texture, u8 *side_
             points.insert(points.end(), pt.begin(), pt.end());
         }
     }
-    for (usize i = 0; i < points.size(); i++) {
-        Point *point = &points[i];
-        point->translate_z(offset);
-    }
 
     return points;
 }

src/donut.h

@@ -1,8 +1,9 @@
 // Alexander Bass
 // Created 4/16/24
+// Modified 4/17/24
 #pragma once
 
 #include "point.h"
 #include <vector>
 
-std::vector<Point> generate_donut(u8 *bottom_texture, u8 *top_texture, u8 *side_texture, f64);
+std::vector<Point> generate_donut(u8 *bottom_texture, u8 *top_texture, u8 *side_texture);

src/main.cpp

@@ -1,18 +1,21 @@
 // Alexander Bass
 // Created 4/16/24
+// Modified 4/17/24
+
 #include "donut.h"
 #include "point.h"
 #include "ppm/ppm.h"
+#include "pts.h"
 #include "types.h"
 #include <cassert>
 #include <chrono>
 #include <cmath>
 #include <format>
-#include <fstream>
 #include <iostream>
 #include <string>
 #include <thread>
 #include <vector>
+
 const i32 WIDTH = 120;
 const i32 HEIGHT = 100;
 const i32 DEPTH = WIDTH;
@@ -25,25 +28,24 @@ void update(vector<Point> &points);
 
 int main() {
 
-    ifstream dirt_file("dirt.ppm");
+    u8 *dirt = ppm::from_file("dirt.ppm");
-    u8 *dirt = ppm::load_ppm(dirt_file);
+    u8 *grass = ppm::from_file("grass_top.ppm");
-    dirt_file.close();
+    u8 *grass_side = ppm::from_file("grass_side.ppm");
-    ifstream grass_file("grass_top.ppm");
-    u8 *grass = ppm::load_ppm(grass_file);
-    grass_file.close();
-    ifstream grass_side_file("grass_side.ppm");
-    u8 *grass_side = ppm::load_ppm(grass_side_file);
-    grass_side_file.close();
 
     std::vector<Point> points = {};
-    points.push_back(*Point(0, 0, 0).set_rgb(1.0, 0, 0));
+    points.push_back(*Point().set_rgb(1.0, 0, 0));
+
+    std::vector<Point> horse = pts::load_pts_from_path("horse.pts.txt");
+    for (auto &p : horse) {
+        vec3 a = p.get_xyz();
+        a *= 300.0;
+        p.set_xyz(a);
+    }
+    points.insert(points.end(), horse.begin(), horse.end());
+
+    // std::vector<Point> donut = generate_donut(dirt, grass, grass_side);
+    // points.insert(points.end(), donut.begin(), donut.end());
 
-    std::vector<Point> donut = generate_donut(dirt, grass, grass_side, 0.0);
-    points.insert(points.end(), donut.begin(), donut.end());
-    donut = generate_donut(dirt, grass, grass_side, 32.0);
-    points.insert(points.end(), donut.begin(), donut.end());
-    donut = generate_donut(dirt, grass, grass_side, -32.0);
-    points.insert(points.end(), donut.begin(), donut.end());
     delete[] dirt;
     delete[] grass;
     delete[] grass_side;
@@ -51,20 +53,25 @@ int main() {
     auto grid = new size_t[WIDTH * HEIGHT];
 
     while (true) {
-        std::cout << "\033c";
+        // Move cursor to top left
+        std::cout << "\033[0;0H";
+        // Draw points
         draw(grid, points);
+        // Rotate points
         update(points);
+        // Wait
         std::this_thread::sleep_for(std::chrono::milliseconds(1000 / 60));
+        // Repeat
     }
-
     return 0;
 }
 
 i32 w_x_to_screen(f64 w_x) {
     return static_cast<i32>(std::round(w_x + static_cast<f64>(WIDTH) / 2.0));
 }
+
 i32 w_y_to_screen(f64 w_y) {
-    return static_cast<i32>(std::round(w_y + static_cast<f64>(HEIGHT) / 2.0));
+    return static_cast<i32>(std::round(w_y + static_cast<f64>(HEIGHT) / 2.0 + 10.5));
 }
 
 f64 w_z_to_screen(f64 w_z) {
@@ -72,30 +79,37 @@ f64 w_z_to_screen(f64 w_z) {
 }
 
 void draw(size_t *grid, vector<Point> &points) {
+    // grid is a list of handles to points in the points vector.
+    // these handles can be 0 to indicate that there is no representative point
+    // and therefor no pixel for that position.
+    // the values of grid can also be the index to points to represent a point
+    // being mapped to a pixel. This system also handles depth buffering.
     for (u32 i = 0; i < static_cast<u32>(WIDTH * HEIGHT); i++) {
         grid[i] = 0;
     };
 
+    // Pseudo-rasterization
     for (size_t i = 0; i < points.size(); i++) {
-        Point p = points[i];
+        Point &p = points[i];
         f64 p_x = p.get_x();
         f64 p_y = p.get_y();
         f64 p_z = p.get_z();
 
         i32 s_x = w_x_to_screen(p_x);
         i32 s_y = w_y_to_screen(p_y);
-        f64 s_z = w_z_to_screen(p_z);
         if (0 <= s_x && s_x < HEIGHT && 0 <= s_y && s_y < HEIGHT) {
             size_t index = static_cast<size_t>(s_x + s_y * HEIGHT);
             size_t existing_pixel_handle = grid[index];
             if (existing_pixel_handle == 0) {
                 grid[index] = i + 1;
             } else if (points[existing_pixel_handle - 1].get_z() < p_z) {
+                // Pixel already exists at point on screen. Check its depth.
                 grid[index] = i + 1;
             }
         }
     }
 
+    // Printing
     std::string line = "";
     for (size_t y = 0; y < static_cast<size_t>(WIDTH); y++) {
         for (size_t x = 0; x < static_cast<size_t>(HEIGHT); x++) {
@@ -109,12 +123,10 @@ void draw(size_t *grid, vector<Point> &points) {
             f64 depth = w_z_to_screen(p.get_z());
             assert(depth >= 0.0);
             assert(depth <= 1.0);
-            f64 red = p.get_r() * depth;
+            vec3 rgb = p.get_rgb() * depth * 255.0;
-            f64 green = p.get_g() * depth;
+            u8 r8 = (u8)(round(rgb.i));
-            f64 blue = p.get_b() * depth;
+            u8 g8 = (u8)(round(rgb.j));
-            u8 r8 = static_cast<u8>(round(red * 255.0));
+            u8 b8 = (u8)(round(rgb.k));
-            u8 g8 = static_cast<u8>(round(green * 255.0));
-            u8 b8 = static_cast<u8>(round(blue * 255.0));
             line += format("\033[38;2;{};{};{}m██", r8, g8, b8);
         }
         line += '\n';
@@ -123,10 +135,9 @@ void draw(size_t *grid, vector<Point> &points) {
 }
 
 void update(vector<Point> &points) {
-    for (size_t i = 0; i < points.size(); i++) {
+    for (auto &p : points) {
-        Point *p = &points[i];
+        p.rotate_x(0.02);
-        p->rotate_x(0.02);
+        p.rotate_y(-0.04);
-        p->rotate_y(-0.04);
+        p.rotate_z(0.03);
-        p->rotate_z(0.03);
     }
 }

src/point.h

@@ -1,8 +1,9 @@
 // Alexander Bass
 // Created 4/16/24
+// Modified 4/17/24
 #pragma once
-#include "rgb.h"
 #include "types.h"
+#include "vec3.h"
 class Point {
   private:
     f64 x;
@@ -21,11 +22,24 @@ class Point {
         g = 1.0;
         b = 1.0;
     }
+    Point() {
+        x = 0.0;
+        y = 0.0;
+        z = 0.0;
+        r = 0.0;
+        g = 0.0;
+        b = 0.0;
+    }
     void set_xyz(f64 _x, f64 _y, f64 _z) {
         x = _x;
         y = _y;
         z = _z;
     };
+    void set_xyz(vec3 pos) {
+        x = pos.i;
+        y = pos.j;
+        z = pos.k;
+    };
     void rotate_x(f64 angle);
     void rotate_y(f64 angle);
     void rotate_z(f64 angle);
@@ -46,6 +60,10 @@ class Point {
         return z;
     };
 
+    vec3 get_xyz() const {
+        return vec3(x, y, z);
+    }
+
     f64 get_r() const {
         return r;
     }
@@ -56,6 +74,10 @@ class Point {
         return b;
     }
 
+    vec3 get_rgb() const {
+        return vec3(r, g, b);
+    }
+
     void translate_x(f64 dx) {
         x += dx;
     }
@@ -72,10 +94,10 @@ class Point {
         b = _b;
         return this;
     };
-    Point *set_rgb(rgb col) {
+    Point *set_rgb(vec3 col) {
-        r = col.r;
+        r = col.i;
-        g = col.g;
+        g = col.j;
-        b = col.b;
+        b = col.k;
         return this;
     };
 };

src/ppm/ppm.cpp

@@ -1,8 +1,10 @@
 // Alexander Bass
 // Created 4/16/24
+// Modified 4/17/24
 #include "ppm.h"
 using std::string;
 #include <cassert>
+#include <fstream>
 #include <iostream>
 #include <string>
 u8 *ppm::load_ppm(std::istream &input) {
@@ -19,11 +21,21 @@ u8 *ppm::load_ppm(std::istream &input) {
 
     u8 *buffer = new u8[width * height * 3];
     for (size_t i = 0; i < width * height * 3; i++) {
-        u16 val = 0;
+        // The extraction operator assumes a uint8_t type represents an ascii
-
+        // character and thus grabs the first ascii character of the color value
+        // and places it within the u8.
+        // A u32 is used as the extraction operator understands it to be an integer
+        u32 val = 0;
         input >> val;
-        buffer[i] = val;
+        buffer[i] = (u8)(val);
     }
 
     return buffer;
 }
+
+u8 *ppm::from_file(string path) {
+    std::ifstream in(path);
+    u8 *ppm = ppm::load_ppm(in);
+    in.close();
+    return ppm;
+}

src/ppm/ppm.h

@@ -1,12 +1,14 @@
 // Alexander Bass
 // Created 4/16/24
+// Modified 4/17/24
 #pragma once
 
 #include "../types.h"
 
 #include <istream>
+#include <string>
 
 namespace ppm {
-
     u8 *load_ppm(std::istream &input);
+    u8 *from_file(std::string path);
 } // namespace ppm

src/pts.cpp

@@ -0,0 +1,38 @@
+// Alexander Bass
+// Created 4/19/24
+// Modified 4/19/24
+#include "point.h"
+#include <istream>
+#include <string>
+#include <vector>
+using std::string;
+#include <cassert>
+#include <fstream>
+#include <iostream>
+#include <string>
+
+namespace pts {
+    std::vector<Point> load_pts(std::istream &input) {
+        std::vector<Point> output = {};
+        while (true) {
+            f64 i = 0.0, j = 0.0, k = 0.0;
+            f64 ni = 0.0, nj = 0.0, nk = 0.0;
+            input >> i;
+            input >> j;
+            input >> k;
+            input >> ni;
+            input >> nj;
+            input >> nk;
+            if (input.eof() || input.fail()) {
+                return output;
+            }
+            output.push_back(Point(i, j, k));
+        }
+        return output;
+    }
+    std::vector<Point> load_pts_from_path(std::string path) {
+        std::ifstream input(path);
+        return load_pts(input);
+        input.close();
+    }
+}

src/pts.h

@@ -0,0 +1,13 @@
+#pragma once
+// Alexander Bass
+//  Created 4/19/24
+// Modified 4/19/24
+#include "point.h"
+#include <istream>
+#include <string>
+#include <vector>
+
+namespace pts {
+    std::vector<Point> load_pts(std::istream &);
+    std::vector<Point> load_pts_from_path(std::string);
+}

src/rgb.h

@@ -1,19 +0,0 @@
-// Alexander Bass
-// Created 4/16/24
-#pragma once
-#include "types.h"
-struct rgb {
-    f64 r;
-    f64 g;
-    f64 b;
-    rgb(f64 _r, f64 _g, f64 _b) {
-        r = _r;
-        g = _g;
-        b = _b;
-    }
-    void mix(rgb rhs) {
-        r *= rhs.r;
-        g *= rhs.g;
-        b *= rhs.b;
-    }
-};

src/types.h

@@ -1,18 +1,18 @@
 // Alexander Bass
 // Created  4/15/24
-// Modified 4/14/24
+// Modified 4/17/24
 #pragma once
 #include <cstdint>
 
-typedef uint8_t u8;
+typedef std::uint8_t u8;
-typedef uint16_t u16;
+typedef std::uint16_t u16;
-typedef uint32_t u32;
+typedef std::uint32_t u32;
-typedef uint64_t u64;
+typedef std::uint64_t u64;
 
-typedef int8_t i8;
+typedef std::int8_t i8;
 typedef std::int16_t i16;
-typedef int32_t i32;
+typedef std::int32_t i32;
-typedef int64_t i64;
+typedef std::int64_t i64;
 
 typedef float f32;
 typedef double f64;

src/vec3.h

@@ -0,0 +1,42 @@
+// Alexander Bass
+// Created 4/16/24
+// Modified 4/17/24
+#pragma once
+#include "types.h"
+struct vec3 {
+    f64 i;
+    f64 j;
+    f64 k;
+    vec3(f64 _i, f64 _j, f64 _k) {
+        i = _i;
+        j = _j;
+        k = _k;
+    }
+
+    vec3 &operator*=(const vec3 &rhs) {
+        i *= rhs.i;
+        j *= rhs.j;
+        k *= rhs.k;
+        return *this;
+    }
+    vec3 operator*(const vec3 &rhs) {
+        vec3 copy = *this;
+        copy.i *= rhs.i;
+        copy.j *= rhs.j;
+        copy.k *= rhs.k;
+        return copy;
+    }
+    vec3 &operator*=(const f64 &rhs) {
+        i *= rhs;
+        j *= rhs;
+        k *= rhs;
+        return *this;
+    }
+    vec3 operator*(const f64 &rhs) {
+        vec3 copy = *this;
+        copy.i *= rhs;
+        copy.j *= rhs;
+        copy.k *= rhs;
+        return copy;
+    }
+};