up down is broken

include/entity.hpp

@@ -1,16 +1,21 @@
 #ifndef DELTA_ENTITY
 #define DELTA_ENTITY
 
+#include <SDL3/SDL.h>
+#include <SDL3/SDL_main.h>
+
 #include "renderer/camera.hpp"
 #include "math.hpp"
 
 class DeltaEntity {
     public:
         DeltaVector3 pos;
+        DeltaVector3 velocity;
         DeltaVector2 angle;
 
-        DeltaEntity(float x, float y, float z);
-        void draw(DeltaCamera camera);
+        DeltaEntity() {pos.x = 0; pos.y = 0; pos.z = 0; velocity = DeltaVector3(); angle = DeltaVector2();};
+        DeltaEntity(float x, float y, float z) {pos.x = x; pos.y = y; pos.z = z; velocity = DeltaVector3(); angle = DeltaVector2(); };
+        void draw(SDL_Renderer *renderer);
         void update(float deltaTime);
 };
 

include/math.hpp

@@ -23,6 +23,11 @@ class DeltaVector3 {
         float x, y, z;
         DeltaVector3(float xval, float yval, float zval);
         DeltaVector3();
+        DeltaVector3 operator+(const DeltaVector3& other) const;
+        DeltaVector3 operator-(const DeltaVector3& other) const;
+        DeltaVector3 operator*(float a) const;
+        DeltaVector3& operator+=(const DeltaVector3& other);
+        DeltaVector3& operator-=(const DeltaVector3& other);
         float distanceToVector(const DeltaVector3 &vec) const;
         float distanceToPos(float x, float y) const;
         float dotProduct(const DeltaVector3 &vec) const;

include/player.hpp

@@ -0,0 +1,23 @@
+#ifndef DELTA_PLAYER
+#define DELTA_PLAYER
+
+#include <SDL3/SDL.h>
+#include <SDL3/SDL_main.h>
+
+#include "renderer/camera.hpp"
+#include "entity.hpp"
+#include "math.hpp"
+
+class Player: public DeltaEntity {
+    public:
+        DeltaCamera camera;
+        DeltaVector2 direction;
+
+        Player() {pos.x = 0; pos.y = 0; pos.z = 0; velocity = DeltaVector3(); angle = DeltaVector2(); camera = DeltaCamera(0, 0, 0);};
+        Player(float x, float y, float z) {pos.x = x; pos.y = y; pos.z = z; velocity = DeltaVector3(); angle = DeltaVector2(); camera = DeltaCamera(0,0,0);};
+
+        void draw(SDL_Renderer *renderer);
+        void update(float deltaTime);
+};
+
+#endif

include/renderer/camera.hpp

@@ -8,6 +8,7 @@ class DeltaCamera {
         DeltaVector3 pos;
         DeltaVector2 angle;
 
+        DeltaCamera() {pos = DeltaVector3(); angle = DeltaVector2();};
         DeltaCamera(float x, float y, float z);
         DeltaVector2 projectPointVec(const DeltaVector3 &worldPos);
         DeltaVector2 projectPoint(float worldX, float worldY, float worldZ);

src/main.cpp

@@ -3,12 +3,14 @@
 #include <SDL3/SDL.h>
 #include <SDL3/SDL_main.h>
 #include <cmath>
+#include <string>
 #include <algorithm>
 
 #include "globals.hpp"
 #include "math.hpp"
 #include "renderer/camera.hpp"
 #include "renderer/calls.hpp"
+#include "player.hpp"
 
 static SDL_Window *window = NULL;
 static SDL_Renderer *renderer = NULL;
@@ -16,6 +18,10 @@ static SDL_Renderer *renderer = NULL;
 DeltaVector2 temp1(125, 150), temp2(150, 120), temp3(100, 100);
 DeltaVector2 topleft, bottomright, p;
 
+Player player = Player(70, 110, 20);
+
+double prev = 0, now = 0, deltaTime;
+
 SDL_AppResult SDL_AppInit(void **appstate, int argc, char *argv[])
 {
     SDL_SetAppMetadata("delta engine game", "0.0", "com.miletici.game");
@@ -39,21 +45,44 @@ SDL_AppResult SDL_AppEvent(void *appstate, SDL_Event *event)
     if (event->type == SDL_EVENT_QUIT) {
         return SDL_APP_SUCCESS;
     }
+
+    if (event->type == SDL_EVENT_KEY_DOWN) {
+        if (event->key.scancode == SDL_SCANCODE_ESCAPE) return SDL_APP_SUCCESS;
+    }
+
     return SDL_APP_CONTINUE;
 }
 
 SDL_AppResult SDL_AppIterate(void *appstate)
 {
-    const double now = ((double)SDL_GetTicks()) / 1000.0;
+    now = ((double)SDL_GetTicks()) / 1000.0;
+    deltaTime = now - prev;
+
+    SDL_SetWindowTitle(window, std::to_string((int)(1 / deltaTime)).c_str());
+    
+    player.update(deltaTime);
+
+    // drawing starts here
 
     SDL_SetRenderDrawColor(renderer, 0, 0, 0, SDL_ALPHA_OPAQUE_FLOAT);
     SDL_RenderClear(renderer);
 
     SDL_SetRenderDrawColor(renderer, 255, 0, 255, SDL_ALPHA_OPAQUE);
-    rasterizeTriangle(renderer, temp1, temp2, temp3);
+    // rasterizeTriangle(renderer, temp1, temp2, temp3);
+
+    DeltaVector2 rendered = player.camera.projectPointVec({ 40, 10, 30 });
+    SDL_RenderPoint(renderer, rendered.x, rendered.y);
+    rendered = player.camera.projectPointVec({ 40, 210, 30 });
+    SDL_RenderPoint(renderer, rendered.x, rendered.y);
+    rendered = player.camera.projectPointVec({ 40, 10, -170 });
+    SDL_RenderPoint(renderer, rendered.x, rendered.y);
+    rendered = player.camera.projectPointVec({ 40, 210, -170 });
+    SDL_RenderPoint(renderer, rendered.x, rendered.y);
 
     SDL_RenderPresent(renderer);
 
+    prev = now;
+
     return SDL_APP_CONTINUE;
 }
 

src/math.cpp

@@ -67,6 +67,33 @@ DeltaVector3::DeltaVector3(float xval, float yval, float zval) {
     z = zval;
 }
 
+DeltaVector3 DeltaVector3::operator+(const DeltaVector3& other) const {
+    return DeltaVector3(x + other.x, y + other.y, z + other.y);
+}
+
+DeltaVector3 DeltaVector3::operator-(const DeltaVector3& other) const {
+    return DeltaVector3(x - other.x, y - other.y, z - other.z);
+}
+
+DeltaVector3 DeltaVector3::operator*(float a) const {
+    return DeltaVector3(x * a, y * a, z * a);
+}
+
+DeltaVector3& DeltaVector3::operator+=(const DeltaVector3& other) {
+    x += other.x;
+    y += other.y;
+    z += other.z;
+
+    return *this;
+}
+DeltaVector3& DeltaVector3::operator-=(const DeltaVector3& other) {
+    x -= other.x;
+    y -= other.y;
+    z -= other.z;
+
+    return *this;
+}
+
 float DeltaVector3::length() const {
     return std::sqrt(x * x + y * y + z * z);
 }

src/player.cpp

@@ -0,0 +1,48 @@
+#include <SDL3/SDL.h>
+#include <SDL3/SDL_main.h>
+#include <cmath>
+#include <string>
+
+#include "player.hpp"
+
+void Player::draw(SDL_Renderer *renderer) {
+
+}
+
+void Player::update(float deltaTime) {
+    const bool *key_states = SDL_GetKeyboardState(NULL);
+    direction = {(float)(key_states[SDL_SCANCODE_D] - key_states[SDL_SCANCODE_A]), (float)(key_states[SDL_SCANCODE_W] - key_states[SDL_SCANCODE_S])};
+
+    DeltaVector2 angleChange;
+    angleChange.x = (float)(key_states[SDL_SCANCODE_RIGHT] - key_states[SDL_SCANCODE_LEFT]);
+    angleChange.y = (float)(key_states[SDL_SCANCODE_UP] - key_states[SDL_SCANCODE_DOWN]);
+
+    float dx = std::sin(angle.x), dy = std::cos(angle.x);
+
+    // if (key_states[SDL_SCANCODE_W])
+    velocity = DeltaVector3();
+    if (direction.y == 1) { velocity.x += dx * 200; velocity.y += dy * 200; }
+    if (direction.y == -1) { velocity.x -= dx * 200; velocity.y -= dy * 200; }
+
+    if (direction.x == 1) { velocity.x += dy * 200; velocity.y -= dx * 200; }
+    if (direction.x == -1) { velocity.x -= dy * 200; velocity.y += dx * 200; }
+
+    if (key_states[SDL_SCANCODE_SPACE]) {
+        velocity.z = 200;
+    }
+    if (key_states[SDL_SCANCODE_LSHIFT]) {
+        velocity.z = -200;
+    }
+
+    SDL_Log(std::to_string(pos.x).c_str());
+    SDL_Log(std::to_string(pos.y).c_str());
+    SDL_Log(std::to_string(pos.z).c_str());
+
+    angle.x += angleChange.x * 3.14 * deltaTime;
+    angle.y += angleChange.y * 3.14 * deltaTime;
+
+    pos += velocity * deltaTime;
+
+    camera.pos = pos;
+    camera.angle = angle;
+}

src/renderer/camera.cpp

@@ -33,12 +33,14 @@ DeltaVector2 DeltaCamera::projectPointVec(const DeltaVector3 &worldPos) {
 
     // pitch translate
 
-    calculatedPos.y = calculatedPos.y * cosineY - calculatedPos.z * sineY;
-    calculatedPos.z = calculatedPos.y * sineY + calculatedPos.z * cosineY;
+    float tempY = calculatedPos.y, tempZ = calculatedPos.z;
+
+    calculatedPos.y = tempY * cosineY - tempZ * sineY;
+    calculatedPos.z = tempY * sineY + tempZ * cosineY;
     // dont touch calculatedPos.x
 
     projected.x = calculatedPos.x * FOCAL / calculatedPos.y + SIMULATED_WIDTH / 2;
-    projected.y = calculatedPos.y * FOCAL / calculatedPos.y + SIMULATED_HEIGHT / 2;
+    projected.y = calculatedPos.z * FOCAL / calculatedPos.y + SIMULATED_HEIGHT / 2;
 
     // now gotta convert y to our y
     projected.y = SIMULATED_HEIGHT - projected.y;