mirror of
https://git.coom.tech/drummyfish/small3dlib.git
synced 2024-11-21 20:39:57 +01:00
340 lines
7.9 KiB
C
340 lines
7.9 KiB
C
/*
|
|
author: Miloslav Ciz
|
|
license: CC0
|
|
*/
|
|
|
|
#include <SDL2/SDL.h>
|
|
#include <stdio.h>
|
|
#include <math.h>
|
|
#include <time.h>
|
|
#include <stdlib.h>
|
|
|
|
#define S3L_FLAT 0
|
|
#define S3L_STRICT_NEAR_CULLING 0
|
|
#define S3L_PERSPECTIVE_CORRECTION 2
|
|
#define S3L_SORT 0
|
|
#define S3L_STENCIL_BUFFER 0
|
|
#define S3L_Z_BUFFER 1
|
|
|
|
#define S3L_PIXEL_FUNCTION drawPixel
|
|
|
|
#define S3L_RESOLUTION_X 800
|
|
#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
|
|
|
|
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()
|
|
{
|
|
memset(pixels,255,S3L_RESOLUTION_X * S3L_RESOLUTION_Y * sizeof(uint32_t));
|
|
}
|
|
|
|
static inline void setPixel(int x, int y, uint8_t red, uint8_t green, uint8_t blue)
|
|
{
|
|
if (x < 0 || x >= S3L_RESOLUTION_X || y < 0 || y >= S3L_RESOLUTION_Y)
|
|
return;
|
|
|
|
uint32_t r = red & 0x000000FF;
|
|
r = r << 24;
|
|
|
|
uint32_t g = green & 0x000000FF;
|
|
g = g << 16;
|
|
|
|
uint32_t b = blue & 0x000000FF;
|
|
b = b << 8;
|
|
|
|
pixels[y * S3L_RESOLUTION_X + x] = r | g | b;
|
|
}
|
|
|
|
void sampleTexture(uint8_t *texture, int32_t u, int32_t v, uint8_t *r, uint8_t *g, uint8_t *b)
|
|
{
|
|
u = S3L_clamp(u,0,TEXTURE_W - 1);
|
|
v = S3L_clamp(v,0,TEXTURE_H - 1);
|
|
|
|
int32_t index = (v * TEXTURE_W + u) * 3;
|
|
|
|
*r = texture[index];
|
|
index++;
|
|
*g = texture[index];
|
|
index++;
|
|
*b = texture[index];
|
|
}
|
|
|
|
uint32_t previousTriangle = -1;
|
|
S3L_Unit uv0[2], uv1[2], uv2[2];
|
|
|
|
void drawPixel(S3L_PixelInfo *p)
|
|
{
|
|
if (p->triangleID != previousTriangle)
|
|
{
|
|
S3L_Index *uvIndices;
|
|
S3L_Unit *uvs;
|
|
|
|
if (p->modelIndex == 0)
|
|
{
|
|
uvIndices = cityUVIndices;
|
|
uvs = cityUVs;
|
|
}
|
|
else
|
|
{
|
|
uvIndices = carUVIndices;
|
|
uvs = carUVs;
|
|
}
|
|
|
|
int16_t index;
|
|
|
|
index = p->triangleIndex * 3;
|
|
|
|
int16_t i0 = uvIndices[index];
|
|
int16_t i1 = uvIndices[index + 1];
|
|
int16_t i2 = uvIndices[index + 2];
|
|
|
|
index = i0 * 2;
|
|
|
|
uv0[0] = uvs[index];
|
|
uv0[1] = uvs[index + 1];
|
|
|
|
index = i1 * 2;
|
|
|
|
uv1[0] = uvs[index];
|
|
uv1[1] = uvs[index + 1];
|
|
|
|
index = i2 * 2;
|
|
|
|
uv2[0] = uvs[index];
|
|
uv2[1] = uvs[index + 1];
|
|
|
|
previousTriangle = p->triangleID;
|
|
}
|
|
|
|
uint8_t r,g,b;
|
|
|
|
S3L_Unit uv[2];
|
|
|
|
uv[0] = S3L_interpolateBarycentric(uv0[0],uv1[0],uv2[0],p->barycentric);
|
|
uv[1] = S3L_interpolateBarycentric(uv0[1],uv1[1],uv2[1],p->barycentric);
|
|
|
|
sampleTexture(cityTexture,uv[0] / 2,uv[1] / 2,&r,&g,&b);
|
|
|
|
setPixel(p->x,p->y,r,g,b);
|
|
}
|
|
|
|
void draw()
|
|
{
|
|
S3L_newFrame();
|
|
|
|
clearScreen();
|
|
|
|
S3L_drawScene(scene);
|
|
}
|
|
|
|
static inline uint32_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];
|
|
}
|
|
|
|
int16_t fps = 0;
|
|
|
|
int main()
|
|
{
|
|
SDL_Window *window = SDL_CreateWindow("model viewer", 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();
|
|
|
|
carModel.transform.translation.x += 7 * (S3L_FRACTIONS_PER_UNIT / 2);
|
|
carModel.transform.translation.z += -7 * (S3L_FRACTIONS_PER_UNIT / 2);
|
|
|
|
models[0] = cityModel;
|
|
models[1] = carModel;
|
|
|
|
S3L_initScene(models,2,&scene);
|
|
|
|
scene.camera.transform.translation.z = -S3L_FRACTIONS_PER_UNIT * 8;
|
|
|
|
int running = 1;
|
|
|
|
clock_t nextPrintT;
|
|
|
|
nextPrintT = clock();
|
|
|
|
S3L_Vec4 carDirection;
|
|
|
|
S3L_initVec4(&carDirection);
|
|
|
|
scene.camera.transform.translation.y = S3L_FRACTIONS_PER_UNIT / 3;
|
|
scene.camera.transform.rotation.x = -S3L_FRACTIONS_PER_UNIT / 32;
|
|
|
|
int16_t velocity = 0;
|
|
|
|
while (running)
|
|
{
|
|
clock_t frameStartT = clock();
|
|
|
|
draw();
|
|
|
|
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;
|
|
|
|
if (timeDiff >= 1.0)
|
|
{
|
|
nextPrintT = nowT;
|
|
printf("FPS: %d\n",fps);
|
|
fps = 0;
|
|
}
|
|
|
|
while (SDL_PollEvent(&event))
|
|
{
|
|
if (event.type == SDL_QUIT)
|
|
running = 0;
|
|
}
|
|
|
|
uint8_t *state = SDL_GetKeyboardState(NULL);
|
|
|
|
int16_t step = velocity * frameDiff;
|
|
int16_t stepFriction = 300 * frameDiff;
|
|
int16_t stepRotation = 200 * frameDiff * S3L_abs(velocity) / ((float) MAX_VELOCITY);
|
|
int16_t stepVelocity = S3L_nonZero(1000 * frameDiff);
|
|
|
|
if (stepRotation == 0 && S3L_abs(velocity) >= 200)
|
|
stepRotation = 1;
|
|
|
|
if (velocity < 0)
|
|
stepRotation *= -1;
|
|
|
|
if (state[SDL_SCANCODE_LEFT])
|
|
{
|
|
models[1].transform.rotation.y += stepRotation;
|
|
models[1].transform.rotation.z = S3L_min(velocity / 64, models[1].transform.rotation.z + stepRotation);
|
|
}
|
|
else if (state[SDL_SCANCODE_RIGHT])
|
|
{
|
|
models[1].transform.rotation.y -= stepRotation;
|
|
models[1].transform.rotation.z = S3L_max(-velocity / 64, models[1].transform.rotation.z - stepRotation);
|
|
}
|
|
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 previousPos = models[1].transform.translation;
|
|
|
|
int16_t friction = 0;
|
|
|
|
if (state[SDL_SCANCODE_UP])
|
|
velocity = S3L_min(MAX_VELOCITY,velocity + (velocity < 0 ? (2 * stepVelocity) : stepVelocity));
|
|
else if (state[SDL_SCANCODE_DOWN])
|
|
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)
|
|
{
|
|
S3L_Vec4 newPos = models[1].transform.translation;
|
|
newPos.x = previousPos.x;
|
|
|
|
friction = 8;
|
|
|
|
if (collision(newPos))
|
|
{
|
|
newPos = models[1].transform.translation;
|
|
newPos.z = previousPos.z;
|
|
|
|
if (collision(newPos))
|
|
{
|
|
newPos = previousPos;
|
|
velocity = 0;
|
|
}
|
|
}
|
|
|
|
models[1].transform.translation = newPos;
|
|
}
|
|
else if (coll == 2)
|
|
{
|
|
models[1].transform.translation.x += 5 * S3L_FRACTIONS_PER_UNIT;
|
|
models[1].transform.translation.z += 2 * S3L_FRACTIONS_PER_UNIT;
|
|
}
|
|
else
|
|
{
|
|
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);
|
|
|
|
S3L_Unit cameraDistance =
|
|
S3L_FRACTIONS_PER_UNIT / 2 + (S3L_abs(velocity) * (S3L_FRACTIONS_PER_UNIT / 2) / MAX_VELOCITY);
|
|
|
|
scene.camera.transform.translation.x =
|
|
scene.models[1].transform.translation.x - (carDirection.x * cameraDistance) / S3L_FRACTIONS_PER_UNIT;
|
|
|
|
scene.camera.transform.translation.z =
|
|
scene.models[1].transform.translation.z - (carDirection.z * cameraDistance) / 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;
|
|
}
|