int main(int ArgumentCount, char **Arguments) {
glutInit(&ArgumentCount, Arguments);
SetupGraphics();
float frequency = 0.05f;
float amplitude = 64;
float Max = 0, Min = 0;
for(int y = 0; y < 512; y++) {
for(int x = 0; x < 512; x++) {
//float N = InterpolatedNoise(x);
float Scale = 0.02f;
float N = PerlinNoise_2D(x * Scale, y * Scale, 0.8f, 8, 0.3f);
if(N > Max)
Max = N;
if(N < Min)
Min = N;
u8 c = (u8)(N * 100.0f) + 128;
DrawPixel(x + 50, y + 50, Color(c, c, c));
}
}
printf("%f %f\n", Min, Max);
// Main
glutMainLoop();
return 0;
}
/* Procedural texture function */
int ptex_fun(float u, float v, GzColor color)
{
int xs=64;
int ys=64;
int i,j;
if (reset)
{
image = (GzColor*)malloc(sizeof(GzColor)*(xs+1)*(ys+1));
for(j=0;j<ys;j++)
{
for(i=0;i<xs;i++)
{
// image[i+j*xs][RED]=(PerlinNoise_2D(i*3,j)+1)/2;
// image[i+j*xs][GREEN]=(PerlinNoise_2D(2*i,3*j)+1)/2;
// image[i+j*xs][BLUE]=(PerlinNoise_2D(i+3*j,j+j)+1)/2;
// image[i+j*xs][RED]=2*PerlinNoise_2D(i*3,j)+3;
// image[i+j*xs][GREEN]=0.5*PerlinNoise_2D(2*i,3*j)+i;
// image[i+j*xs][BLUE]=1.3*PerlinNoise_2D(i+3*j,j+j);
image[i+j*xs][RED]=((2*PerlinNoise_2D(i*3,j)+3)-1)/4;
image[i+j*xs][GREEN]=((0.5*PerlinNoise_2D(2*i,3*j)+i)-i+0.5);
image[i+j*xs][BLUE]=(1.3*PerlinNoise_2D(i+3*j,j+j)+1.3)/2.6;
}
}
reset = 0;
}/* init is done */
/* bounds-test u,v to make sure nothing will overflow image array bounds */
if(u<0){u=0;}
else if(u>1){u=1;}
if(v<0){v=0;}
else if(v>1){v=1;}
/* determine texture cell corner values and perform bilinear interpolation */
u=u*(xs-1);
v=v*(ys-1);
int uf,uc,vf,vc;
float s,t;
GzColor exactcolor;
uf=floor(u);
uc=ceil(u);
vf=floor(v);
vc=ceil(v);
s=u-uf;
t=v-vf;
exactcolor[RED]=s*t*image[uc+(vc*xs)][RED]+(1-s)*t*image[uf+(vc*xs)][RED]+s*(1-t)*image[uc+(vf*xs)][RED]+(1-s)*(1-t)*image[uf+(vf*xs)][RED];
exactcolor[GREEN]=s*t*image[uc+(vc*xs)][GREEN]+(1-s)*t*image[uf+(vc*xs)][GREEN]+s*(1-t)*image[uc+(vf*xs)][GREEN]+(1-s)*(1-t)*image[uf+(vf*xs)][GREEN];
exactcolor[BLUE]=s*t*image[uc+(vc*xs)][BLUE]+(1-s)*t*image[uf+(vc*xs)][BLUE]+s*(1-t)*image[uc+(vf*xs)][BLUE]+(1-s)*(1-t)*image[uf+(vf*xs)][BLUE];
/* set color to interpolated GzColor value and return */
/*
if(exactcolor[RED]<0){exactcolor[RED]=0;}
else if(exactcolor[RED]>1){exactcolor[RED]=1;}
if(exactcolor[GREEN]<0){exactcolor[GREEN]=0;}
else if(exactcolor[GREEN]>1){exactcolor[GREEN]=1;}
if(exactcolor[BLUE]<0){exactcolor[BLUE]=0;}
else if(exactcolor[BLUE]>1){exactcolor[BLUE]=1;}
*/
color[RED]=exactcolor[RED];
color[GREEN]=exactcolor[GREEN];
color[BLUE]=exactcolor[BLUE];
return GZ_SUCCESS;// write by me
}
