public static Texture Checkerboard(int w, int h, int cellbits, uint oddColor, uint evenColor)
{
Texture t = new Texture(w,h);
int pos = 0;
for(int y = 0; y < h; y++)
for(int x = 0; x < w; x++)
t.Pixel[pos++] = (((((x>>cellbits)+(y>>cellbits))&1)==0) ? evenColor : oddColor );
return t;
}
public static Texture Perlin(int w, int h, float persistency, float density, int samples, int scale)
{
TextureFactory.initNoiseBuffer();
Texture t = new Texture(w,h);
int pos = 0;
float wavelength = (float) ((w > h) ? w : h )/density;
for(int y = 0; y < h; y++)
for(int x = 0; x < w; x++)
t.Pixel[pos++] = (uint)((float) scale*TextureFactory.perlin2d(x,y,wavelength,persistency,samples));
return t;
}
public static Texture BlendTopDown(Texture top, Texture down)
{
down.Resize(top.Width,top.Height);
Texture t = new Texture(top.Width,top.Height);
int pos = 0;
int alpha;
for(int y = 0; y < top.Height; y++) {
alpha = 255*y/(top.Height-1);
for(int x = 0; x < top.Width; x++) {
t.Pixel[pos] = Colors.Transparency(down.Pixel[pos],top.Pixel[pos],alpha);
pos++;
}
}
return t;
}
public Texture Add(Texture additive)
{
for(int i = this.Width*this.Height-1; i >= 0; i--)
this.Pixel[i] = Colors.Add(this.Pixel[i],additive.Pixel[i]);
return this;
}
public Texture Sub(Texture subtractive)
{
for(int i = this.Width*this.Height-1; i >= 0; i--)
this.Pixel[i] = Colors.Sub(this.Pixel[i],subtractive.Pixel[i]);
return this;
}
public Texture Put(Texture newData)
{
Array.Copy(newData.Pixel,0,this.Pixel,0,this.Width*this.Height);
return this;
}
public Texture Multiply(Texture multiplicative)
{
for(int i = this.Width*this.Height-1; i >= 0; i--)
this.Pixel[i] = Colors.Multiply(this.Pixel[i],multiplicative.Pixel[i]);
return this;
}
public Texture Mix(Texture newData)
{
for(int i = this.Width*this.Height-1; i >= 0; i--)
this.Pixel[i] = Colors.Mix(this.Pixel[i],newData.Pixel[i]);
return this;
}
public Texture GetClone()
{
Texture t = new Texture(this.Width,this.Height);
for(int i = 0; i < this.Pixel.Length; i++)
t.Pixel[i] = this.Pixel[i];
return t;
}
public static int GenerateHeightMap(Texture texture, float dxz, float dy, int granularity, out int idBuffer, out int idN)
{
int w = texture.Width;
int h = texture.Height;
int lnx = (w/granularity);
int lnz = (h/granularity);
idN = (lnx*(lnz-0x01))<<0x01;
int[] idData = new int[idN];
dxz *= granularity;
int k = 0x00;
for(int i = (lnz-0x01)*lnx-0x01, j = i+lnx; i >= 0x00;) {
idData[k++] = j--;
idData[k++] = i--;
}
GL.GenBuffers(0x01, out idBuffer);
GL.BindBuffer(BufferTarget.ElementArrayBuffer, idBuffer);
GL.BufferData(BufferTarget.ElementArrayBuffer, new IntPtr(sizeof(int)*idData.Length), idData, BufferUsageHint.StaticDraw);
float[] xntData = new float[(lnx*lnz)<<0x03];
float vy, ty, dyx, dyz, ntx = 1.0f/(lnx-0x01), nty = 1.0f/(lnz-0x01), nn, dxzsq = 4.0f*dxz*dxz;
uint[] pixel = texture.Pixel;
float factor = dy/255.0f;
k = 0x00;
int l = 0x00;
float x0 = -0.5f*dxz*(lnx-0x01), z0 = -0.5f*dxz*(lnz-0x01);
for(int i = 0x00; i < lnz; i++) {
vy = dxz*i+z0;
ty = nty*i;
l = w*i*granularity;
for(int j = 0x00; j < lnx; j++) {
xntData[k++] = dxz*j+x0;
xntData[k++] = (pixel[l]&0xff)*factor;
xntData[k++] = vy;
if(i > 0x00 && j > 0x00 && i < (lnz-0x01) && j < (lnx-0x01)) {
//fill
dyx = (pixel[l-0x01]&0xff)-(pixel[l+0x01]&0xff)*factor;
dyz = (pixel[l-w]&0xff)-(pixel[l+w]&0xff)*factor;
nn = (float)(1.0d/Math.Sqrt(dxzsq+dyx*dyx+dyz*dyz));
xntData[k++] = dyx*nn;
xntData[k++] = 2.0f*dxz*nn;
xntData[k++] = dyz*nn;
}
else {
//border
xntData[k++] = 0.0f;
xntData[k++] = 1.0f;
xntData[k++] = 0.0f;
}
xntData[k++] = ntx*j;
xntData[k++] = ty;
l += granularity;
}
}
int xntBuff;
GL.GenBuffers(0x01, out xntBuff);
GL.BindBuffer(BufferTarget.ArrayBuffer, xntBuff);
GL.BufferData(BufferTarget.ArrayBuffer, new IntPtr(sizeof(float)*xntData.Length), xntData, BufferUsageHint.StaticDraw);
return xntBuff;
}
