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mesa: fix mipmap generation for immutable, compressed textures

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If the immutable compressed texture didn't have the full mip pyramid,
this didn't work, because it tried to generate mip levels for non-existing
levels. _mesa_prepare_mipmap_level() would correctly handle this by returning
FALSE if the mip level didn't exist, however we actually created the
non-existing mip level right before that because we used _mesa_get_tex_image()
before calling _mesa_prepare_mipmap_level(). It would then proceed to crash
(we allocated the mip level, which is a bad idea on an immutable texture,
but didn't initialize the values, leading to assertion failures or segfaults).
Fix this by using _mesa_select_tex_image() instead and call it after
_mesa_prepare_mipmap_level(), as that function will allocate missing mip levels
for non-immutable textures already.
This fixes a (2 year old) crash with astromenace which was hack-fixed in ubuntu
packages instead: http://bugs.debian.org/718680 (I guess most apps do full mip
chains - I believe this app not doing it is actually unintentional, always one
level less than full mip chain...).

Cc: "10.6 11.0" <mesa-stable@lists.freedesktop.org>
Reviewed-by: Brian Paul <brianp@vmware.com>
(cherry picked from commit 19604d30e1)
This commit is contained in:
Roland Scheidegger 2015-09-20 01:33:17 +02:00 • committed by Emil Velikov
parent 1805e64739
commit 41b44abdcb
1 changed files with 15 additions and 21 deletions
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36
src/mesa/main/mipmap.c
View file

@ -1922,11 +1922,8 @@ generate_mipmap_uncompressed(struct gl_context *ctx, GLenum target,
}
/* get dest gl_texture_image */
dstImage = _mesa_get_tex_image(ctx, texObj, target, level + 1);
if (!dstImage) {
_mesa_error(ctx, GL_OUT_OF_MEMORY, "generating mipmaps");
return;
}
dstImage = _mesa_select_tex_image(texObj, target, level + 1);
assert(dstImage);
if (target == GL_TEXTURE_1D_ARRAY) {
srcDepth = srcHeight;
@ -2107,7 +2104,19 @@ generate_mipmap_compressed(struct gl_context *ctx, GLenum target,
srcWidth, srcHeight, srcDepth,
&dstWidth, &dstHeight, &dstDepth);
if (!nextLevel)
break;
goto end;
if (!_mesa_prepare_mipmap_level(ctx, texObj, level + 1,
dstWidth, dstHeight, dstDepth,
border, srcImage->InternalFormat,
srcImage->TexFormat)) {
/* all done */
goto end;
}
/* get dest gl_texture_image */
dstImage = _mesa_select_tex_image(texObj, target, level + 1);
assert(dstImage);
/* Compute dst image strides and alloc memory on first iteration */
temp_dst_row_stride = _mesa_format_row_stride(temp_format, dstWidth);
@ -2121,13 +2130,6 @@ generate_mipmap_compressed(struct gl_context *ctx, GLenum target,
}
}
/* get dest gl_texture_image */
dstImage = _mesa_get_tex_image(ctx, texObj, target, level + 1);
if (!dstImage) {
_mesa_error(ctx, GL_OUT_OF_MEMORY, "generating mipmaps");
goto end;
}
/* for 2D arrays, setup array[depth] of slice pointers */
for (i = 0; i < srcDepth; i++) {
temp_src_slices[i] = temp_src + temp_src_img_stride * i;
@ -2146,14 +2148,6 @@ generate_mipmap_compressed(struct gl_context *ctx, GLenum target,
dstWidth, dstHeight, dstDepth,
temp_dst_slices, temp_dst_row_stride);
if (!_mesa_prepare_mipmap_level(ctx, texObj, level + 1,
dstWidth, dstHeight, dstDepth,
border, srcImage->InternalFormat,
srcImage->TexFormat)) {
/* all done */
goto end;
}
/* The image space was allocated above so use glTexSubImage now */
ctx->Driver.TexSubImage(ctx, 2, dstImage,
0, 0, 0, dstWidth, dstHeight, dstDepth,