1 files changed, 336 insertions, 0 deletions
diff --git a/src/city/city.c b/src/city/city.c
new file mode 100644
index 0000000..3ba25cb
--- /dev/null
+++ b/src/city/city.c
@@ -0,0 +1,336 @@
+/*
+  Example program for small3dlib -- a GTA-like game demo.
+
+  author: Miloslav Ciz
+  license: CC0 1.0
+*/
+
+#include <SDL2/SDL.h>
+#include <SDL2/SDL_scancode.h>
+#include <stdio.h>
+#include <time.h>
+
+#define S3L_FLAT 0
+#define S3L_NEAR_CROSS_STRATEGY 3
+#define S3L_PERSPECTIVE_CORRECTION 2
+#define S3L_SORT 0
+#define S3L_STENCIL_BUFFER 0
+#define S3L_Z_BUFFER 2
+
+#define S3L_PIXEL_FUNCTION drawPixel
+
+#define S3L_RESOLUTION_X 1000
+#define S3L_RESOLUTION_Y 600
+
+#include "small3dlib.h"
+
+#include "cityModel.h"
+#include "cityTexture.h"
+#include "carModel.h"
+
+#define TEXTURE_W 256
+#define TEXTURE_H 256
+
+#define MAX_VELOCITY 1000
+#define ACCELERATION 700
+#define TURN_SPEED 300
+#define FRICTION 600
+
+S3L_Model3D models[2];
+
+const uint8_t collisionMap[8 * 10] =
+{
+  1,1,1,1,1,1,1,1,
+  1,1,1,1,0,0,0,1,
+  1,1,1,1,0,1,0,1,
+  2,2,1,0,0,0,0,3,
+  1,2,1,0,1,1,3,1,
+  2,0,0,0,1,1,3,3,
+  1,0,1,0,0,1,1,1,
+  1,0,0,0,1,1,1,1,
+  1,1,1,1,1,1,1,1,
+  1,1,1,1,1,1,1,1
+};
+
+S3L_Scene scene;
+
+uint32_t pixels[S3L_RESOLUTION_X * S3L_RESOLUTION_Y];
+
+uint32_t frame = 0;
+
+void clearScreen()
+{
+  uint32_t index = 0;
+
+  for (uint16_t y = 0; y < S3L_RESOLUTION_Y; ++y)
+  {
+    S3L_Unit t = S3L_min(S3L_FRACTIONS_PER_UNIT,((y * S3L_FRACTIONS_PER_UNIT) / S3L_RESOLUTION_Y) * 4);
+
+    uint32_t r = S3L_interpolateByUnit(200,242,t);
+    uint32_t g = S3L_interpolateByUnit(102,255,t);
+    uint32_t b = S3L_interpolateByUnit(255,230,t);
+
+    uint32_t color = (r << 24) | (g << 16 ) | (b << 8);
+
+    for (uint16_t x = 0; x < S3L_RESOLUTION_X; ++x)
+    {
+      pixels[index] = color;
+      index++;
+    }
+  }
+}
+
+static inline void setPixel(int x, int y, uint8_t red, uint8_t green, uint8_t blue)
+{
+  uint8_t *p = ((uint8_t *) pixels) + (y * S3L_RESOLUTION_X + x) * 4 + 1;
+
+  *p = blue;
+  ++p;
+  *p = green;
+  ++p;
+  *p = red;
+}
+
+void sampleTexture(int32_t u, int32_t v, uint8_t *r, uint8_t *g, uint8_t *b)
+{
+  u = S3L_clamp(u,0,CITY_TEXTURE_WIDTH - 1);
+  v = S3L_clamp(v,0,CITY_TEXTURE_HEIGHT - 1);
+
+  const uint8_t *t = cityTexture + (v * CITY_TEXTURE_WIDTH + u) * 3;
+
+  *r = *t;
+  t++;
+  *g = *t;
+  t++;
+  *b = *t;
+}
+
+uint32_t previousTriangle = -1;
+S3L_Vec4 uv0, uv1, uv2;
+
+void drawPixel(S3L_PixelInfo *p)
+{
+  if (p->triangleID != previousTriangle)
+  {
+    const S3L_Index *uvIndices;
+    const S3L_Unit *uvs;
+
+    if (p->modelIndex == 0)
+    {
+      uvIndices = cityUVIndices;
+      uvs = cityUVs;
+    }
+    else
+    {
+      uvIndices = carUVIndices;
+      uvs = carUVs;
+    }
+
+    S3L_getIndexedTriangleValues(p->triangleIndex,uvIndices,uvs,2,&uv0,&uv1,&uv2);
+
+    previousTriangle = p->triangleID;
+  }
+
+  uint8_t r, g, b;
+
+  S3L_Unit uv[2];
+
+  uv[0] = S3L_interpolateBarycentric(uv0.x,uv1.x,uv2.x,p->barycentric);
+  uv[1] = S3L_interpolateBarycentric(uv0.y,uv1.y,uv2.y,p->barycentric);
+
+  sampleTexture(uv[0] >> 1,uv[1] >> 1,&r,&g,&b);
+  
+  setPixel(p->x,p->y,r,g,b); 
+}
+
+void draw()
+{
+  S3L_newFrame();
+  clearScreen();
+  S3L_drawScene(scene);
+}
+
+static inline uint8_t collision(S3L_Vec4 worldPosition)
+{
+  worldPosition.x /= S3L_FRACTIONS_PER_UNIT;
+  worldPosition.z /= -S3L_FRACTIONS_PER_UNIT;    
+
+  uint16_t index = worldPosition.z * 8 + worldPosition.x;
+
+  return collisionMap[index];
+}
+
+static inline void handleCollision(S3L_Vec4 *pos, S3L_Vec4 previousPos)
+{
+  S3L_Vec4 newPos = *pos;
+  newPos.x = previousPos.x;
+    
+  if (collision(newPos))
+  {
+    newPos = *pos;
+    newPos.z = previousPos.z;
+
+    if (collision(newPos))
+      newPos = previousPos;
+  }
+
+  *pos = newPos;
+}
+
+int16_t fps = 0;
+
+int main()
+{
+  SDL_Window *window = SDL_CreateWindow("city demo", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, S3L_RESOLUTION_X, S3L_RESOLUTION_Y, SDL_WINDOW_SHOWN); 
+  SDL_Renderer *renderer = SDL_CreateRenderer(window,-1,0);
+  SDL_Texture *textureSDL = SDL_CreateTexture(renderer,SDL_PIXELFORMAT_RGBX8888, SDL_TEXTUREACCESS_STATIC, S3L_RESOLUTION_X, S3L_RESOLUTION_Y);
+  SDL_Surface *screenSurface = SDL_GetWindowSurface(window);
+  SDL_Event event;
+
+  cityModelInit();
+  carModelInit();
+
+  models[0] = cityModel;
+  models[1] = carModel;
+
+  S3L_sceneInit(models,2,&scene);
+
+  S3L_transform3DSet(1909,16,-3317,0,-510,0,512,512,512,&(models[1].transform));
+
+  int running = 1;
+
+  clock_t nextPrintT;
+
+  nextPrintT = clock();
+
+  S3L_Vec4 carDirection;
+
+  S3L_vec4Init(&carDirection);
+  
+  scene.camera.transform.translation.x = 0;
+  scene.camera.transform.translation.y = S3L_FRACTIONS_PER_UNIT / 4;
+  scene.camera.transform.rotation.x = 1;
+
+  int16_t velocity = 0;
+
+  while (running) // main loop
+  {
+    clock_t frameStartT = clock();
+
+    models[1].transform.rotation.y += models[1].transform.rotation.z; // overturn the car for the rendering
+
+    draw();
+
+    models[1].transform.rotation.y -= models[1].transform.rotation.z; // turn the car back for the physics
+
+    fps++;
+
+    SDL_UpdateTexture(textureSDL,NULL,pixels,S3L_RESOLUTION_X * sizeof(uint32_t));
+
+    clock_t nowT = clock();
+
+    double timeDiff = ((double) (nowT - nextPrintT)) / CLOCKS_PER_SEC;
+    double frameDiff = ((double) (nowT - frameStartT)) / CLOCKS_PER_SEC;
+    int16_t frameDiffMs = frameDiff * 1000;
+
+    if (timeDiff >= 1.0)
+    {
+      nextPrintT = nowT;
+      printf("FPS: %d\n",fps);
+      fps = 0;
+    }
+
+    while (SDL_PollEvent(&event))
+      if (event.type == SDL_QUIT)
+        running = 0;
+
+    const uint8_t *state = SDL_GetKeyboardState(NULL);
+
+    int16_t step = (velocity * frameDiffMs) / 1000;
+    int16_t stepFriction = (FRICTION * frameDiffMs) / 1000;
+    int16_t stepRotation = TURN_SPEED * frameDiffMs * S3L_max(0,velocity - 200) / (MAX_VELOCITY * 1000);
+
+    int16_t stepVelocity = S3L_nonZero((ACCELERATION * frameDiffMs) / 1000);
+
+    if (stepRotation == 0 && S3L_abs(velocity) >= 200)
+      stepRotation = 1;
+
+    if (velocity < 0)
+      stepRotation *= -1;
+
+    if (state[SDL_SCANCODE_LEFT] || state[SDL_SCANCODE_A])
+    {
+      models[1].transform.rotation.y += stepRotation;
+      models[1].transform.rotation.z =
+        S3L_min(S3L_abs(velocity) / 64, models[1].transform.rotation.z + 1);
+    }
+    else if (state[SDL_SCANCODE_RIGHT] || state[SDL_SCANCODE_D])
+    {
+      models[1].transform.rotation.y -= stepRotation;
+      models[1].transform.rotation.z =
+        S3L_max(-S3L_abs(velocity) / 64, models[1].transform.rotation.z - 1);
+    }
+    else
+      models[1].transform.rotation.z = (models[1].transform.rotation.z * 3) / 4;
+
+    S3L_rotationToDirections(models[1].transform.rotation,S3L_FRACTIONS_PER_UNIT,&carDirection,0,0);
+
+    S3L_Vec4 previousCarPos = models[1].transform.translation;
+
+    int16_t friction = 0;
+
+    if (state[SDL_SCANCODE_UP] || state[SDL_SCANCODE_W])
+      velocity = S3L_min(MAX_VELOCITY,velocity + (velocity < 0 ? (2 * stepVelocity) : stepVelocity));
+    else if (state[SDL_SCANCODE_DOWN] || state[SDL_SCANCODE_S])
+      velocity = S3L_max(-MAX_VELOCITY,velocity - (velocity > 0 ? (2 * stepVelocity) : stepVelocity));
+    else
+      friction = 1;
+
+    models[1].transform.translation.x += (carDirection.x * step) / S3L_FRACTIONS_PER_UNIT;
+    models[1].transform.translation.z += (carDirection.z * step) / S3L_FRACTIONS_PER_UNIT;
+
+    uint8_t coll = collision(models[1].transform.translation);
+
+    if (coll != 0)
+    {
+      if (coll == 1)
+      {
+        handleCollision(&(models[1].transform.translation),previousCarPos);
+        friction = 2;
+      }
+      else if (coll == 2)
+      {
+        // teleport the car
+        models[1].transform.translation.x += 5 * S3L_FRACTIONS_PER_UNIT;
+        models[1].transform.translation.z += 2 * S3L_FRACTIONS_PER_UNIT;
+      }
+      else
+      {
+        // teleport the car
+        models[1].transform.translation.x -= 5 * S3L_FRACTIONS_PER_UNIT;
+        models[1].transform.translation.z -= 2 * S3L_FRACTIONS_PER_UNIT;
+      }
+    }
+
+    if (velocity > 0)
+      velocity = S3L_max(0,velocity - stepFriction * friction);
+    else
+      velocity = S3L_min(0,velocity + stepFriction * friction);
+
+    scene.camera.transform.translation.x =
+      scene.models[1].transform.translation.x - (carDirection.x) / S3L_FRACTIONS_PER_UNIT;
+
+    scene.camera.transform.translation.z =
+      scene.models[1].transform.translation.z - (carDirection.z) / S3L_FRACTIONS_PER_UNIT;
+
+    scene.camera.transform.rotation.y = models[1].transform.rotation.y;
+
+    SDL_RenderClear(renderer);
+    SDL_RenderCopy(renderer,textureSDL,NULL,NULL);
+    SDL_RenderPresent(renderer);
+
+    frame++;
+  }
+
+  return 0;
+}