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scale down over-large textures (slow but effective)

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git-svn-id: http://svn.berlios.de/svnroot/repos/oolite-linux/trunk@737 127b21dd-08f5-0310-b4b7-95ae10353056
This commit is contained in:
Giles Williams 2006-08-20 12:18:56 +00:00
parent c32455a497
commit fd5785b3c8
1 changed files with 45 additions and 1 deletions
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46
src/Core/TextureStore.m
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@ -272,6 +272,50 @@ GLuint max_texture_dimension = 512; // conservative start
freeTexBytes = NO;
}
if ((texture_w > max_d)||(texture_h > max_d)) // we need to scale the texture down to the maximum texture dimensions
{
NSLog(@"INFORMATION: texture '%@' is %d x %d - too large for this version of OpenGL, it will be scaled down.",
filename, image_w, image_h);
int tex_w = (texture_w > max_d)? max_d : texture_w;
int tex_h = (texture_h > max_d)? max_d : texture_h;
//
unsigned char *texBytes2 = malloc( tex_w * tex_h * n_planes);
//
int x, y, n, ix, iy;
//
int sx = texture_w / tex_w; // samples per x
int sy = texture_h / tex_h; // samples per x
//
float ds = 1.0 / (sx * sy);
//
texi = 0;
//
// do sample based scaling
for ( y = 0; y < tex_h; y++)
{
for ( x = 0; x < tex_w; x++)
{
for (n = 0; n < n_planes; n++)
{
float acc = 0;
for (iy = 0; iy < sy; iy++) for (ix = 0; ix < sx; ix++)
acc += ds * texBytes[ ((y * sy + iy) * texture_w + (x * sx + ix)) * n_planes + n ];
//
texBytes2[ texi++] = (char)acc;
}
}
}
//
if (freeTexBytes)
free((void*)texBytes);
texBytes = texBytes2;
texture_w = tex_w;
texture_h = tex_h;
//
}
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
glGenTextures(1, &texName); // get a new unique texture name
glBindTexture(GL_TEXTURE_2D, texName);
@ -582,7 +626,7 @@ GLuint max_texture_dimension = 512; // conservative start
NSLog(@"genning normal map for land_fraction %.5f", land_fraction);
// fillRanNoiseBuffer();
fillSquareImageWithPlanetNMap( imageBuffer, texture_w, 4, 1.0, sea_bias, 64.0);
fillSquareImageWithPlanetNMap( imageBuffer, texture_w, 4, 1.0, sea_bias, 24.0);
texBytes = imageBuffer;