78 lines
1.7 KiB
C++
78 lines
1.7 KiB
C++
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#include "particle.hpp"
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#include "polygon.hpp"
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void
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ParticleEngineCreate(ParticleEngine* pe, int n, float x, float y, float z)
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{
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memset(pe, 0, sizeof(ParticleEngine));
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VectorCreate(pe->origin, x, y, z);
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pe->n = n;
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pe->life = (int*) calloc(n, sizeof(int));
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pe->pos = (Vector*) calloc(n, sizeof(Vector));
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pe->vel = (Vector*) calloc(n, sizeof(Vector));
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assert(pe->life && pe->pos && pe->vel);
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}
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void
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ParticleEngineUpdate(ParticleEngine* pe)
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{
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for (int i = 0; i < pe->n; i++)
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{
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if (pe->life[i] == 0)
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{
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pe->life[i] = rand() % 1000;
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v3dcpy(pe->pos[i], pe->origin);
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VectorCreate(pe->vel[i],
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(rand() % 100 - 50) / 100.0f,
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(rand() % 100 - 50) / 100.0f,
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(rand() % 100 - 50) / 100.0f);
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}
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else
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{
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pe->life[i]--;
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}
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VectorAddition(pe->pos[i], pe->pos[i], pe->vel[i]);
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pe->vel[i][1] -= 0.001f;
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}
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}
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void
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ParticleEngineRender(ParticleEngine* pe, Camera* camera)
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{
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Vector tmp[1000];
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Pixel** fb;
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Pixel** zb;
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unsigned x, y, z, width, height;
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width = camera->fb->width;
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height = camera->fb->height;
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fb = camera->fb->pixels;
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zb = camera->zb->pixels;
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PolygonTransform(tmp, pe->pos, pe->n, camera->matrix);
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PolygonProject(tmp, pe->n, camera);
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for (int i = 0; i < pe->n; i++)
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{
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z = Round(tmp[i][2]);
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if (z > 0)
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{
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x = Round(tmp[i][0]);
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y = Round(tmp[i][1]);
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if (x < width && y < height && z < zb[y][x])
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{
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fb[y][x] = PIXEL_GREEN;
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}
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}
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}
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}
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