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mesa: added _mesa_format_image_size64()

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This commit is contained in:
Brian Paul 2010-11-24 12:00:16 -07:00
parent 7bfbd88d2c
commit 74c324fdba
2 changed files with 34 additions and 0 deletions
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30
src/mesa/main/formats.c
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@ -1073,6 +1073,36 @@ _mesa_format_image_size(gl_format format, GLsizei width,
}
/**
* Same as _mesa_format_image_size() but returns a 64-bit value to
* accomodate very large textures.
*/
uint64_t
_mesa_format_image_size64(gl_format format, GLsizei width,
GLsizei height, GLsizei depth)
{
const struct gl_format_info *info = _mesa_get_format_info(format);
/* Strictly speaking, a conditional isn't needed here */
if (info->BlockWidth > 1 || info->BlockHeight > 1) {
/* compressed format (2D only for now) */
const uint64_t bw = info->BlockWidth, bh = info->BlockHeight;
const uint64_t wblocks = (width + bw - 1) / bw;
const uint64_t hblocks = (height + bh - 1) / bh;
const uint64_t sz = wblocks * hblocks * info->BytesPerBlock;
assert(depth == 1);
return sz;
}
else {
/* non-compressed */
const uint64_t sz = ((uint64_t) width *
(uint64_t) height *
(uint64_t) depth *
info->BytesPerBlock);
return sz;
}
}
GLint
_mesa_format_row_stride(gl_format format, GLsizei width)

4
src/mesa/main/formats.h
View file

@ -209,6 +209,10 @@ extern GLuint
_mesa_format_image_size(gl_format format, GLsizei width,
GLsizei height, GLsizei depth);
extern uint64_t
_mesa_format_image_size64(gl_format format, GLsizei width,
GLsizei height, GLsizei depth);
extern GLint
_mesa_format_row_stride(gl_format format, GLsizei width);