feat: changed fov

fastmath.hpp

@@ -44,6 +44,8 @@ struct decimal {
         return {MUL_F(d1.i, d2.i)};
     }
 
+    decimal &operator*=(const decimal &d) { return (*this) = {MUL_F(i, d.i)}; }
+
     friend decimal operator/(const decimal &d1, const decimal &d2) {
         return {DIV_F(d1.i, d2.i)};
     }
@@ -55,6 +57,12 @@ struct decimal {
     friend bool operator>(const decimal &d1, const decimal &d2) {
         return d1.i > d2.i;
     }
+    friend bool operator<=(const decimal &d1, const decimal &d2) {
+        return d1.i <= d2.i;
+    }
+    friend bool operator>=(const decimal &d1, const decimal &d2) {
+        return d1.i >= d2.i;
+    }
 
     friend bool operator==(const decimal &d1, const decimal &d2) {
         return d1.i == d2.i;
@@ -62,7 +70,6 @@ struct decimal {
     friend bool operator!=(const decimal &d1, const decimal &d2) {
         return d1.i != d2.i;
     }
-
     decimal &operator=(decimal const &in) {
         if (this != &in) {
             std::destroy_at(this);
@@ -74,6 +81,7 @@ struct decimal {
     decimal sqrt() { return {((int32_t)sqrtf(i)) << HALF_SHIFT}; }
 
     float to_float() { return TO_FLOAT(i); }
+    bool isSmall() { return (abs(i) < (1 << (HALF_SHIFT - 1))); }
 };
 
 template <int n, class Dev> struct vec {
@@ -155,6 +163,13 @@ template <int n, class Dev> struct vec {
         }
         return res;
     }
+    bool isSmall() {
+        for (int i = 0; i < n; i++) {
+            if (!v[i].isSmall())
+                return false;
+        }
+        return true;
+    }
     decimal &operator[](const int &i) { return v[i]; }
 
     decimal len_sq() { return *this * *this; }

main.cpp

@@ -2,10 +2,12 @@
 #include "polygon.hpp"
 #include "renderer.hpp"
 #include "rendertarget.hpp"
+#include "testModel.hpp"
 #include <QApplication>
 #include <QImage>
 #include <QLabel>
 #include <QPixmap>
+#include <chrono>
 #include <functional>
 #include <math.h>
 #include <stdio.h>
@@ -74,9 +76,19 @@ int main(int argc, char *argv[]) {
     renderer.target = &target;
 
     polygon poly =
-        polygon(vec3(0.9, 0.9, 0.0), vec3(0.5, 0.1, 0.0), vec3(0.1, 0.9, 0.0));
+        polygon(vec3(0.9, 0.9, 1.0), vec3(0.5, 0.1, 1.0), vec3(0.1, 0.9, 1.0));
 
-    renderer.render(&poly);
+    std::chrono::steady_clock::time_point begin =
+        std::chrono::steady_clock::now();
+    renderer.render(&testModel);
+    std::chrono::steady_clock::time_point end =
+        std::chrono::steady_clock::now();
+
+    std::cout << "Time difference = "
+              << std::chrono::duration_cast<std::chrono::milliseconds>(end -
+                                                                       begin)
+                     .count()
+              << "[ms]" << std::endl;
     QApplication a(argc, argv);
 
     uint8_t *pixel = new uint8_t[64 * 64 * 3];
@@ -98,9 +110,8 @@ int main(int argc, char *argv[]) {
             addTo((target.width * y * 2 + (x * 2 + 1)) * 3, result);
             addTo((target.width * (y * 2 + 1) + (x * 2 + 1)) * 3, result);
             for (int c = 0; c < 3; c++) {
-                pixel[(WIDTH * y + x) * 3 + c] = result[c] >> 2; /*
+                pixel[(WIDTH * (WIDTH - y - 1) + WIDTH - x - 1) * 3 + c] =
-                     target.pixels[(target.width * y * 2 + x * 2) * 3 + c].i >>
+                    result[c] >> 2;
-                     SHIFT_AMOUNT;*/
             }
         }
     }

model.hpp

@@ -0,0 +1,16 @@
+
+#ifndef MODEL_H
+#define MODEL_H
+
+#include "fastmath.hpp"
+#include <tuple>
+#include <vector>
+struct model {
+    std::vector<vec3> verts;
+    // At 0 vertecie index, at 1 normal index
+    std::vector<std::tuple<uint16_t, uint16_t>> faces;
+    std::vector<vec3> normals;
+    std::vector<vec3> colors;
+};
+
+#endif

parseObj.py

@@ -0,0 +1,50 @@
+# Open the file in read mode
+file = open("test.obj", "r")
+
+# Read the entire content of the file
+content = file.read().split("\n")
+
+file.close()
+
+startVerts = 0
+verts = []
+for index,line in enumerate(content):
+    if line[0] == 'o':
+        startVerts = index + 1
+        content = content[startVerts:]
+        break
+
+for index,line in enumerate(content):
+    if "vn" in line:
+        endVerts = index
+        verts = content[:endVerts]
+        content = content[endVerts:]
+        break
+
+
+normals = []
+for index,line in enumerate(content):
+    if "vt" in line:
+        normals = content[:index]
+        content = content[index:]
+        break
+
+startFaces = 0;
+faces = []
+for index,line in enumerate(content):
+    if line[0] == 'f':
+        startFaces = index
+        faces = content[startFaces:-1]
+        break
+
+colors = ["vec3(" +",".join(vert.split(" ")[4:7]) + ")" for vert in verts]
+verts = ["vec3(" +",".join(vert.split(" ")[1:4]) + ")" for vert in verts]
+faces = [ ",".join(["{" + str(int((d.split("/")[0])) - 1) + "," +  str(int((d.split("/")[2])) - 1) + "}" for d in face.split(" ")[1:4]]) for face in faces]
+normals = ["vec3(" + ",".join(normal.split(" ")[1:4]) + ")" for normal in normals]
+
+out = "#include \"model.hpp\" \n const model testModel({" + ",".join(verts) +"},{" + ",".join(faces) + "},{" + ",".join(normals) + "},{"+ ",".join(colors)+"});"
+
+with open("testModel.hpp", "w") as f:
+  f.write(out)
+print(out)
+# Close the file

polygon.hpp

@@ -4,25 +4,110 @@
 #include "fastmath.hpp"
 struct polygon {
 
-    const vec3 points[3];
+    vec3 points[3];
+    decimal delta[9];
+    bool small = false;
+    decimal baryFactor;
+
+    decimal bounding[4]; // min x, max x, min y, max y
+    vec3 normals[3];
+    vec3 colors[3];
 
     polygon(const vec3 &v1, const vec3 &v2, const vec3 &v3)
-        : points{v1, v2, v3} {}
+        : points{v1, v2, v3}, delta{} {}
+    polygon() : points{}, delta{} {}
+
+    void calcDelta() {
 
-    bool contains(const vec3 &p) {
         for (int i = 0; i < 3; i++) {
             int n = (i + 1) % 3;
 
-            vec3 d = points[n] - points[i];
+            delta[i * 3] = points[i].y() - points[n].y();
-            d = vec3(d.y(), -d.x(), d.z());
+            delta[i * 3 + 1] = points[n].x() - points[i].x();
+            delta[i * 3 + 2] =
+                points[i].x() * points[n].y() - points[i].y() * points[n].x();
+            if (delta[i * 3].i == 0 && delta[i * 3 + 1].i == 0)
+                small = true;
+        }
+        bounding[0] = points[0].x();
+        bounding[1] = points[0].x();
+        bounding[2] = points[0].y();
+        bounding[3] = points[0].y();
+        for (int i = 1; i < 3; i++) {
+            if (bounding[0] > points[i].x())
+                bounding[0] = points[i].x();
+            if (bounding[1] < points[i].x())
+                bounding[1] = points[i].x();
+            if (bounding[2] > points[i].y())
+                bounding[2] = points[i].y();
+            if (bounding[3] < points[i].y())
+                bounding[3] = points[i].y();
+        }
 
-            vec3 s = p - points[n];
+        baryFactor =
+            (points[1].x() - points[0].x()) * (points[2].y() - points[1].y()) -
+            (points[1].y() - points[0].y()) * (points[2].x() - points[1].x());
 
-            if (s * d < decimal(0.0))
+        if (baryFactor.isSmall()) {
+            small = true;
+        } else
+            baryFactor = decimal(1.0) / baryFactor;
+        // std::cout << baryFactor << std::endl;
+        /*if ((bounding[1].i - bounding[0].i < 1 << HALF_SHIFT) &&
+            (bounding[3].i - bounding[2].i < 1 << HALF_SHIFT))
+            small = true;*/
+    }
+
+    const bool contains(const vec3 &p) {
+        // if (skip)
+        //    return false;
+        for (int i = 0; i < 3; i++) {
+            if (small)
+                return true;
+            vec3 d = p;
+            if ((d.x() * delta[i * 3] + d.y() * delta[i * 3 + 1] +
+                 delta[i * 3 + 2]) > decimal(0.2))
                 return false;
         }
         return true;
     }
+    friend std::ostream &operator<<(std::ostream &os, const polygon &p) {
+        for (int i = 0; i < 3; i++) {
+            os << p.points[i];
+        }
+        return os;
+    }
+
+    vec3 calcNormal(vec3 barycentrics) {
+        vec3 result = normals[0] * barycentrics[0] +
+                      normals[1] * barycentrics[1] +
+                      normals[2] * barycentrics[2];
+        return result.normalize();
+    }
+
+    vec3 calcColor(vec3 barycentrics) {
+        return colors[0] * barycentrics[0] + colors[1] * barycentrics[1] +
+               colors[2] * barycentrics[2];
+    }
+
+    decimal calcDepth(vec3 barycentrics) {
+        return points[0].z() * barycentrics[0] +
+               points[1].z() * barycentrics[1] +
+               points[2].z() * barycentrics[2];
+    }
+
+    vec3 calcBarycentric(vec3 s) {
+        if (small)
+            return vec3(decimal(0.333), decimal(0.333), decimal(0.333));
+        vec3 result;
+        result[0] = (points[1].x() - s.x()) * (points[2].y() - s.y()) -
+                    (points[2].x() - s.x()) * (points[1].y() - s.y());
+        result[1] = (points[2].x() - s.x()) * (points[0].y() - s.y()) -
+                    (points[0].x() - s.x()) * (points[2].y() - s.y());
+        result = result * baryFactor;
+        result[2] = decimal(1.0) - result[1] - result[0];
+        return result;
+    }
 };
 
 #endif

renderer.hpp

@@ -3,38 +3,115 @@
 #define RENDERER_H
 
 #include "fastmath.hpp"
+#include "model.hpp"
 #include "polygon.hpp"
 #include "rendertarget.hpp"
+#include <bits/stdc++.h>
+#include <cstring>
 #include <memory.h>
 
+#define SCREEN_SPACE_SIZE 8.0
+
 class Renderer {
 
   public:
     Rendertarget *target;
 
     bool clearTarget = true;
-    Renderer() : clearTarget(false) {}
 
-    void render(polygon *p) {
+    void toScreenSpace(vec3 *p) {
-        decimal widthScale = decimal(1.0) / decimal((float)target->width);
+        p->x() = p->x() / p->z() * decimal(2.0) * decimal(SCREEN_SPACE_SIZE) +
-        decimal heightScale = decimal(1.0) / decimal((float)target->height);
+                 decimal(SCREEN_SPACE_SIZE);
-        // std::cout << widthScale << std::endl;
+        p->y() = p->y() / p->z() * decimal(2.0) * decimal(SCREEN_SPACE_SIZE) +
-        vec3 pos = vec3();
+                 decimal(SCREEN_SPACE_SIZE);
+        p->z() = p->z();
+    }
 
+    void render(const model *model) {
+        decimal widthScale =
+            decimal(SCREEN_SPACE_SIZE * 2) / decimal((float)target->width);
+        decimal heightScale =
+            decimal(SCREEN_SPACE_SIZE * 2) / decimal((float)target->height);
+
+        decimal invWidthScale =
+            decimal((float)(target->width / SCREEN_SPACE_SIZE / 2));
+        decimal invHeightScale =
+            decimal((float)(target->height / SCREEN_SPACE_SIZE / 2));
+
+        // TODO clear target with memset
         if (clearTarget) {
-            memset((wchar_t *)target->pixels, 0,
+            // memset((wchar_t *)target->pixels, 0,
-                   target->height * target->width * sizeof(target[0]));
+            //        target->height * target->width * sizeof(target[0]));
+            target->clearDepth();
         }
 
-        for (int x = 0; x < target->height; x++) {
+        vec3 verts[model->verts.size()] = {};
-            for (int y = 0; y < target->height; y++) {
+
-                if (p->contains(pos)) {
+        std::copy(model->verts.begin(), model->verts.end(), verts);
-                    target->set(x, y, vec3(0.0, 255.0, 0.0));
+
-                }
+        for (int i = 0; i < model->verts.size(); i++) {
-                pos.y() += heightScale;
+            toScreenSpace(verts + i);
+        }
+
+        polygon testP;
+
+        for (int f = 0; f < model->faces.size(); f += 3) {
+            for (int p = 0; p < 3; p++) {
+                testP.points[p] = verts[std::get<0>(model->faces[f + p])];
+                testP.colors[p] =
+                    model->colors[std::get<0>(model->faces[f + p])];
+                testP.normals[p] =
+                    model->normals[std::get<1>(model->faces[f + p])];
+            }
+
+            testP.calcDelta();
+
+            int startX = std::max(
+                (testP.bounding[0] * invWidthScale).i >> SHIFT_AMOUNT, 0);
+            int endX =
+                std::min((testP.bounding[1] * invWidthScale).i >> SHIFT_AMOUNT,
+                         target->width - 1);
+            int startY = std::max(
+                (testP.bounding[2] * invHeightScale).i >> SHIFT_AMOUNT, 0);
+            int endY =
+                std::min((testP.bounding[3] * invHeightScale).i >> SHIFT_AMOUNT,
+                         target->height - 1);
+
+            vec3 pos = vec3(testP.bounding[0], testP.bounding[2], 0.0);
+            for (int x = startX; x < endX; x++) {
+                for (int y = startY; y < endY; y++) {
+                    if (testP.contains(pos)) {
+                        vec3 factors = testP.calcBarycentric(pos);
+                        factors = factors.normalize();
+                        decimal depth = testP.calcDepth(factors);
+                        if (depth < target->getDepth(x, y)) {
+                            // std::cout << factors << std::endl;
+                            vec3 normal = testP.calcNormal(factors);
+                            vec3 color = testP.calcColor(factors);
+                            decimal lightFac =
+                                std::max(
+                                    normal *
+                                        (-vec3(1.0, -1.0, 1.0).normalize()),
+                                    decimal(0.0)) +
+                                decimal(0.5);
+                            target->setDepth(x, y, depth);
+                            target->set(x, y,
+                                        (color * decimal(120.0)) * lightFac);
+
+                            // target->set(x, y,
+                            //             (normals + vec3(1.0, 1.0, 1.0)) *
+                            //                 decimal(120.0));
+                            // target->set(x, y, factors * decimal(200.0));
+                            // if (!factors.isSmall())
+                            //   target->set(x, y, vec3(0., 255.0, 0.));
+                        }
+                        // target->set(x, y, vec3(0.0, 255.0, 0.0));
+                    }
+                    pos.y() += heightScale;
+                }
+                pos.y() = decimal(testP.bounding[2]);
+                pos.x() += widthScale;
             }
-            pos.y() = decimal(0);
-            pos.x() += widthScale;
         }
     }
 };

rendertarget.hpp

@@ -11,6 +11,7 @@ class Rendertarget {
 
     Rendertarget(int width, int height) : width(width), height(height) {
         pixels = new decimal[width * height * 3];
+        depth = new decimal[width * height];
     }
 
     void set(int x, int y, vec3 val) {
@@ -25,8 +26,17 @@ class Rendertarget {
             (*val)[i] = pixels[start + i];
         }
     }
+    decimal getDepth(int x, int y) { return depth[width * y + x]; }
+    void setDepth(int x, int y, decimal val) { depth[width * y + x] = val; }
+
+    void clearDepth() {
+        for (int i = 0; i < width * height; i++) {
+            depth[i].i = std::numeric_limits<int32_t>::max();
+        }
+    }
 
     decimal *pixels;
+    decimal *depth;
 };
 
 #endif