On Mon, May 3, 2010 at 1:57 PM, José Fonseca <jfons...@vmware.com> wrote:
> On Mon, 2010-05-03 at 01:36 -0700, Xavier Chantry wrote: > > I am trying to understand the s3tc init code as nv50 gallium has a > > problem with that. > > > > It looks like some drivers (r300g and llvmpipe) actually inits s3tc in > > two places : > > ./src/mesa/main/texcompress_s3tc.c _mesa_init_texture_s3tc() > > ./src/gallium/auxiliary/util/u_format_s3tc.c util_format_s3tc_init() > > > > Here is an extract of the backtrace calls while loading fgfs on llvmpipe > : > > driCreateScreen -> llvmpipe_create_screen -> util_format_s3tc_init > > driCreateContext -> st_create_context -> _mesa_create_context_for_api > > -> init_attrib_groups -> _mesa_init_texture_s3tc > > > > These two functions seem to do more or less the same job, and > > apparently, the classic mesa init is unused for a gallium driver. > > So I suppose that init is not necessary, but it happens because > > gallium and mesa are tightly tied together, and create context is > > handled similarly, but it shouldn't hurt ? > > Both inits are necessary. The same .so is used for both paths, but given > that gallium and mesa do not depend on each other that's the way to do > it. Gallium and mesa also have seperate format translation functions. > > At least until we start factoring code into a separate library. (I said > I'd do it, but stuff came up and I couldn't do when I thought, and I > don't know when I'll be able to do it...) > > > Additionally r300g and llvmpipe added util_format_s3tc_init to their > > create_screen functions, and util/u_format_s3tc.c apparently contains > > all the functions that a gallium driver uses. > > So I suppose that nvfx and nv50 should do the same ? > > > > If that's correct, the patch below might not be completely wrong. > > > > On Mon, May 3, 2010 at 12:44 AM, Xavier Chantry > > <chantry.xav...@gmail.com> wrote: > > > flightgear now dies with : > > > Mesa warning: external dxt library not available: texstore_rgba_dxt3 > > > util/u_format_s3tc.c:66:util_format_dxt3_rgba_fetch_stub: Assertion `0' > failed. > > > > > > I don't really understand what these stubs are about, they were > > > introduced by following commit : > > > commit d96e87c3c513f8ed350ae24425edb74b6d6fcc13 > > > Author: José Fonseca <jfons...@vmware.com> > > > Date: Wed Apr 7 20:47:38 2010 +0100 > > > > > > util: Use stubs for the dynamically loaded S3TC functions. > > > > > > Loosely based on Luca Barbieri's commit > > > 52e9b990a192a9329006d5f7dd2ac222effea5a5. > > > > > > Looking at llvm and r300 code and trying to guess, I came up with the > > > following patch that allows flightgear to start again. But I don't > > > really understand that stuff so it could be wrong. > > > nvfx is probably affected as well. > > > > > > > > > diff --git a/src/gallium/drivers/nouveau/nouveau_screen.c > > > b/src/gallium/drivers/nouveau/nouveau_screen.c > > > index 233a91a..a91b00b 100644 > > > --- a/src/gallium/drivers/nouveau/nouveau_screen.c > > > +++ b/src/gallium/drivers/nouveau/nouveau_screen.c > > > @@ -5,6 +5,7 @@ > > > #include "util/u_memory.h" > > > #include "util/u_inlines.h" > > > #include "util/u_format.h" > > > +#include "util/u_format_s3tc.h" > > > > > > #include <stdio.h> > > > #include <errno.h> > > > @@ -248,6 +249,8 @@ nouveau_screen_init(struct nouveau_screen *screen, > > > struct nouveau_device *dev) > > > pscreen->fence_signalled = nouveau_screen_fence_signalled; > > > pscreen->fence_finish = nouveau_screen_fence_finish; > > > > > > + util_format_s3tc_init(); > > > + > > > return 0; > > > } > > > > > > diff --git a/src/gallium/drivers/nv50/nv50_screen.c > > > b/src/gallium/drivers/nv50/nv50_screen.c > > > index 2dd1042..0d74c90 100644 > > > --- a/src/gallium/drivers/nv50/nv50_screen.c > > > +++ b/src/gallium/drivers/nv50/nv50_screen.c > > > @@ -20,6 +20,7 @@ > > > * SOFTWARE. > > > */ > > > > > > +#include "util/u_format_s3tc.h" > > > #include "pipe/p_screen.h" > > > > > > #include "nv50_context.h" > > > @@ -72,10 +73,6 @@ nv50_screen_is_format_supported(struct pipe_screen > *pscreen, > > > case PIPE_FORMAT_A8_UNORM: > > > case PIPE_FORMAT_I8_UNORM: > > > case PIPE_FORMAT_L8A8_UNORM: > > > - case PIPE_FORMAT_DXT1_RGB: > > > - case PIPE_FORMAT_DXT1_RGBA: > > > - case PIPE_FORMAT_DXT3_RGBA: > > > - case PIPE_FORMAT_DXT5_RGBA: > > > case PIPE_FORMAT_S8_USCALED_Z24_UNORM: > > > case PIPE_FORMAT_Z24_UNORM_S8_USCALED: > > > case PIPE_FORMAT_Z32_FLOAT: > > > @@ -85,6 +82,11 @@ nv50_screen_is_format_supported(struct pipe_screen > *pscreen, > > > case PIPE_FORMAT_R16G16_SNORM: > > > case PIPE_FORMAT_R16G16_UNORM: > > > return TRUE; > > > + case PIPE_FORMAT_DXT1_RGB: > > > + case PIPE_FORMAT_DXT1_RGBA: > > > + case PIPE_FORMAT_DXT3_RGBA: > > > + case PIPE_FORMAT_DXT5_RGBA: > > > + return util_format_s3tc_enabled; > > > default: > > > break; > > > } > > > > > You should only advertise PIPE_FORMAT_DXT* for BIND_SAMPLER_VIEW, or you > may end up in very weird paths. Same for YUV. > I think my hw supports rendering to YUV textures, it's been even implemented in r300g but not tested. I am not sure who's gonna use such a feature. Should I disable it then? -Marek
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