williamjcm/small3dlib
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Add fog

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This commit is contained in:
Miloslav Číž 2019-06-07 11:56:42 +02:00
parent 2164c46fa1
commit 42d3c2107c
1 changed files with 14 additions and 0 deletions
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14
programs/modelViewer.c
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@ -88,6 +88,7 @@ S3L_Unit uv0[2], uv1[2], uv2[2];
uint16_t l0, l1, l2;
S3L_Vec4 toLight;
int8_t light = 1;
int8_t fog = 0;
int8_t mode = 0;
S3L_Vec4 n0, n1, n2;
@ -209,6 +210,17 @@ void drawPixel(S3L_PixelInfo *p)
b = S3L_clamp((((int16_t) b) * l) / S3L_FRACTIONS_PER_UNIT,0,255);
}
if (fog)
{
int16_t f = ((p->depth - S3L_NEAR) * 255) / (S3L_FRACTIONS_PER_UNIT * 64);
f *= 2;
r = S3L_clamp(((int16_t) r) + f,0,255);
g = S3L_clamp(((int16_t) g) + f,0,255);
b = S3L_clamp(((int16_t) b) + f,0,255);
}
setPixel(p->x,p->y,r,g,b);
}
@ -313,6 +325,8 @@ int main()
{
if (event.key.keysym.scancode == SDL_SCANCODE_L)
light = !light;
else if (event.key.keysym.scancode == SDL_SCANCODE_F)
fog = !fog;
else if (event.key.keysym.scancode == SDL_SCANCODE_SPACE)
{
modelIndex = (modelIndex + 1) % modelsTotal;