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https://git.coom.tech/drummyfish/small3dlib.git
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305 lines
7.1 KiB
C
305 lines
7.1 KiB
C
/*
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Example program for small3dlib -- a GTA-like game demo.
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author: Miloslav Ciz
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license: CC0 1.0
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*/
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#include <stdio.h>
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#include <time.h>
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#define S3L_FLAT 0
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#define S3L_NEAR_CROSS_STRATEGY 3
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#define S3L_PERSPECTIVE_CORRECTION 2
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#define S3L_SORT 0
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#define S3L_STENCIL_BUFFER 0
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#define S3L_Z_BUFFER 2
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#define S3L_PIXEL_FUNCTION drawPixel
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#define S3L_RESOLUTION_X 640
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#define S3L_RESOLUTION_Y 480
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#include "../small3dlib.h"
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#include "cityModel.h"
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#include "cityTexture.h"
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#include "carModel.h"
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#define TEXTURE_W 256
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#define TEXTURE_H 256
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#include "sdl_helper.h"
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#define MAX_VELOCITY 1000
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#define ACCELERATION 700
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#define TURN_SPEED 300
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#define FRICTION 600
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S3L_Model3D models[2];
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const uint8_t collisionMap[8 * 10] =
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{
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1,1,1,1,1,1,1,1,
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1,1,1,1,0,0,0,1,
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1,1,1,1,0,1,0,1,
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2,2,1,0,0,0,0,3,
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1,2,1,0,1,1,3,1,
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2,0,0,0,1,1,3,3,
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1,0,1,0,0,1,1,1,
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1,0,0,0,1,1,1,1,
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1,1,1,1,1,1,1,1,
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1,1,1,1,1,1,1,1
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};
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S3L_Scene scene;
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uint32_t frame = 0;
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void clearScreenBlue()
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{
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uint32_t index = 0;
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for (uint16_t y = 0; y < S3L_RESOLUTION_Y; ++y)
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{
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S3L_Unit t = S3L_min(S3L_FRACTIONS_PER_UNIT,((y * S3L_FRACTIONS_PER_UNIT) / S3L_RESOLUTION_Y) * 4);
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uint32_t r = S3L_interpolateByUnit(200,242,t);
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uint32_t g = S3L_interpolateByUnit(102,255,t);
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uint32_t b = S3L_interpolateByUnit(255,230,t);
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uint32_t color = (r << 24) | (g << 16 ) | (b << 8);
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for (uint16_t x = 0; x < S3L_RESOLUTION_X; ++x)
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{
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pixels[index] = color;
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index++;
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}
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}
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}
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uint32_t previousTriangle = -1;
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S3L_Vec4 uv0, uv1, uv2;
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void drawPixel(S3L_PixelInfo *p)
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{
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if (p->triangleID != previousTriangle)
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{
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const S3L_Index *uvIndices;
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const S3L_Unit *uvs;
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if (p->modelIndex == 0)
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{
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uvIndices = cityUVIndices;
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uvs = cityUVs;
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}
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else
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{
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uvIndices = carUVIndices;
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uvs = carUVs;
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}
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S3L_getIndexedTriangleValues(p->triangleIndex,uvIndices,uvs,2,&uv0,&uv1,&uv2);
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previousTriangle = p->triangleID;
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}
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uint8_t r, g, b;
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S3L_Unit uv[2];
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uv[0] = S3L_interpolateBarycentric(uv0.x,uv1.x,uv2.x,p->barycentric);
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uv[1] = S3L_interpolateBarycentric(uv0.y,uv1.y,uv2.y,p->barycentric);
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sampleTexture(cityTexture,uv[0] >> 1,uv[1] >> 1,&r,&g,&b);
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setPixel(p->x,p->y,r,g,b);
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}
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void draw()
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{
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S3L_newFrame();
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clearScreenBlue();
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S3L_drawScene(scene);
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}
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static inline uint8_t collision(S3L_Vec4 worldPosition)
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{
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worldPosition.x /= S3L_FRACTIONS_PER_UNIT;
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worldPosition.z /= -S3L_FRACTIONS_PER_UNIT;
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uint16_t index = worldPosition.z * 8 + worldPosition.x;
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return collisionMap[index];
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}
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static inline void handleCollision(S3L_Vec4 *pos, S3L_Vec4 previousPos)
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{
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S3L_Vec4 newPos = *pos;
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newPos.x = previousPos.x;
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if (collision(newPos))
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{
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newPos = *pos;
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newPos.z = previousPos.z;
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if (collision(newPos))
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newPos = previousPos;
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}
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*pos = newPos;
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}
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int16_t fps = 0;
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int main(void)
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{
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sdlInit();
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cityModelInit();
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carModelInit();
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models[0] = cityModel;
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models[1] = carModel;
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S3L_sceneInit(models,2,&scene);
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S3L_transform3DSet(1909,16,-3317,0,-510,0,512,512,512,&(models[1].transform));
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int running = 1;
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clock_t nextPrintT;
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nextPrintT = clock();
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S3L_Vec4 carDirection;
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S3L_vec4Init(&carDirection);
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scene.camera.transform.translation.y = S3L_FRACTIONS_PER_UNIT / 2;
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scene.camera.transform.rotation.x = -S3L_FRACTIONS_PER_UNIT / 16;
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int16_t velocity = 0;
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while (running) // main loop
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{
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clock_t frameStartT = clock();
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models[1].transform.rotation.y += models[1].transform.rotation.z; // overturn the car for the rendering
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draw();
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models[1].transform.rotation.y -= models[1].transform.rotation.z; // turn the car back for the physics
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fps++;
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clock_t nowT = clock();
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double timeDiff = ((double) (nowT - nextPrintT)) / CLOCKS_PER_SEC;
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double frameDiff = ((double) (nowT - frameStartT)) / CLOCKS_PER_SEC;
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int16_t frameDiffMs = frameDiff * 1000;
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if (timeDiff >= 1.0)
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{
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nextPrintT = nowT;
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printf("FPS: %d\n",fps);
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fps = 0;
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}
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while (SDL_PollEvent(&event))
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if (event.type == SDL_QUIT)
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running = 0;
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const uint8_t *state = SDL_GetKeyboardState(NULL);
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int16_t step = (velocity * frameDiffMs) / 1000;
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int16_t stepFriction = (FRICTION * frameDiffMs) / 1000;
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int16_t stepRotation = TURN_SPEED * frameDiffMs * S3L_max(0,velocity - 200) / (MAX_VELOCITY * 1000);
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int16_t stepVelocity = S3L_nonZero((ACCELERATION * frameDiffMs) / 1000);
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if (stepRotation == 0 && S3L_abs(velocity) >= 200)
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stepRotation = 1;
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if (velocity < 0)
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stepRotation *= -1;
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if (state[SDL_SCANCODE_ESCAPE])
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running = 0;
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else if (state[SDL_SCANCODE_LEFT])
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{
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models[1].transform.rotation.y += stepRotation;
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models[1].transform.rotation.z =
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S3L_min(S3L_abs(velocity) / 64, models[1].transform.rotation.z + 1);
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}
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else if (state[SDL_SCANCODE_RIGHT])
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{
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models[1].transform.rotation.y -= stepRotation;
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models[1].transform.rotation.z =
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S3L_max(-S3L_abs(velocity) / 64, models[1].transform.rotation.z - 1);
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}
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else
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models[1].transform.rotation.z = (models[1].transform.rotation.z * 3) / 4;
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S3L_rotationToDirections(models[1].transform.rotation,S3L_FRACTIONS_PER_UNIT,&carDirection,0,0);
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S3L_Vec4 previousCarPos = models[1].transform.translation;
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int16_t friction = 0;
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if (state[SDL_SCANCODE_UP])
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velocity = S3L_min(MAX_VELOCITY,velocity + (velocity < 0 ? (2 * stepVelocity) : stepVelocity));
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else if (state[SDL_SCANCODE_DOWN])
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velocity = S3L_max(-MAX_VELOCITY,velocity - (velocity > 0 ? (2 * stepVelocity) : stepVelocity));
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else
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friction = 1;
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models[1].transform.translation.x += (carDirection.x * step) / S3L_FRACTIONS_PER_UNIT;
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models[1].transform.translation.z += (carDirection.z * step) / S3L_FRACTIONS_PER_UNIT;
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uint8_t coll = collision(models[1].transform.translation);
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if (coll != 0)
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{
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if (coll == 1)
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{
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handleCollision(&(models[1].transform.translation),previousCarPos);
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friction = 2;
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}
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else if (coll == 2)
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{
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// teleport the car
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models[1].transform.translation.x += 5 * S3L_FRACTIONS_PER_UNIT;
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models[1].transform.translation.z += 2 * S3L_FRACTIONS_PER_UNIT;
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}
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else
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{
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// teleport the car
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models[1].transform.translation.x -= 5 * S3L_FRACTIONS_PER_UNIT;
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models[1].transform.translation.z -= 2 * S3L_FRACTIONS_PER_UNIT;
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}
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}
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if (velocity > 0)
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velocity = S3L_max(0,velocity - stepFriction * friction);
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else
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velocity = S3L_min(0,velocity + stepFriction * friction);
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S3L_Unit cameraDistance =
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S3L_interpolate(S3L_FRACTIONS_PER_UNIT / 2,(3 * S3L_FRACTIONS_PER_UNIT) / 4,S3L_abs(velocity),MAX_VELOCITY);
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scene.camera.transform.translation.x =
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scene.models[1].transform.translation.x - (carDirection.x * cameraDistance) / S3L_FRACTIONS_PER_UNIT;
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scene.camera.transform.translation.z =
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scene.models[1].transform.translation.z - (carDirection.z * cameraDistance) / S3L_FRACTIONS_PER_UNIT;
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scene.camera.transform.rotation.y = models[1].transform.rotation.y;
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sdlUpdate();
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frame++;
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}
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return 0;
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}
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