boost::optional< PowerOf2 > makePowerOf2(uint64_t n) {
uint64_t x = n;
if (x == 0) return boost::optional< PowerOf2 >();
while (x % 2 == 0) x /= 2;
if (x > 1) return boost::optional< PowerOf2 >();
else return boost::optional< PowerOf2 >(PowerOf2(n));
}
T NearestPowerOf2(T val)
{
if (val < 1)
{
return 1;
}
// Find position of the most significant bit
T k = BinaryLogarithm(val);
// Return result depending on the next bit
if (!Algo::Bits::IsBitSet(val, T(k - 1)))
{
return PowerOf2(k);
}
// Check overflow
if (k + 1 == (sizeof(T) << 3))
{
throw OverflowException(SAF_SOURCE_LOCATION, Text::String("Overflow."));
}
return PowerOf2(k + 1);
}
void initTextures() {
gliGenericImage *image[num_textures];
int n=0;
image[n++] = readImage("/Users/nate/school/3600/Maze/Maze/hedge.tga");
image[n++] = readImage("/Users/nate/school/3600/Maze/Maze/snow.tga");
image[n++] = readImage("/Users/nate/school/3600/Maze/Maze/sky.tga");
image[n++] = readImage("/Users/nate/school/3600/Maze/Maze/johnny.tga");
if(n!=num_textures)
{
printf("Error: Wrong number of textures\n");
exit(1);;
}
glGenTextures(num_textures, texName);
for(int i=0; i<num_textures; i++)
{
glBindTexture(GL_TEXTURE_2D, texName[i]);
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL);
int repeats = i == 1 || i == 3;
int needs_border = false; // i == 3; // Needed if clamping and not filling the whole polygon.
if(repeats)
{
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
}
else
{
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
}
if(needs_border)
{
// set a border.
SetBorder(image[i]);
}
bool mipmaps = false;
if(!PowerOf2(image[i]->height) || !PowerOf2(image[i]->width))
{
// WARNING: Images that do not have width and height as
// powers of 2 MUST use mipmaps.
mipmaps = true;
}
if (mipmaps)
{
gluBuild2DMipmaps(GL_TEXTURE_2D, image[i]->components,
image[i]->width, image[i]->height,
image[i]->format, GL_UNSIGNED_BYTE, image[i]->pixels);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
//GL_LINEAR_MIPMAP_LINEAR);
GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER,
//GL_LINEAR);
GL_NEAREST);
}
else
{
glTexImage2D(GL_TEXTURE_2D, 0, image[i]->components,
image[i]->width, image[i]->height, 0,
image[i]->format, GL_UNSIGNED_BYTE, image[i]->pixels);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
}
}
}