mesa/st: add support for dynamic sampler offsets

Replace the plain sampler index with a register reference to a sampler.
We also need to keep track of the sampler array size when there is a
relative reference so that we can mark the whole array used.

To facilitate implementation, we add a separate ADDR register that
exclusively handles the sampler relative address. Other approaches would
be more invasive.

Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Acked-by: Marek Olšák <marek.olsak@amd.com>
Reviewed-by: Roland Scheidegger <sroland@vmware.com>
mesa/st: Move declaration to top of block.

To fix MSVC build failure.

Trivial.
svga: Add a limit to the maximum surface size

This patch adds a limit to the maximum surface size which is
based on the maximum size of a single mob. If this value is not
available, the maximum surface size is by default set to 128 MB.

Reviewed-by: Thomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: Brian Paul <brianp@vmware.com>
mesa: update glext.h to version 20140810

This brings in the new OpenGL 4.5 features.

Reviewed-by: Ilia Mirkin <imirkin@alum.mit.edu>
mesa: update glxext.h to version 20140810

Reviewed-by: Ilia Mirkin <imirkin@alum.mit.edu>
mesa: update wglext.h to version 20140810

Reviewed-by: Ilia Mirkin <imirkin@alum.mit.edu>
mesa: regenerate gl_mangle.h

Reviewed-by: Ilia Mirkin <imirkin@alum.mit.edu>
winsys/radeon: fix nop packet padding for hawaii

The initial firmware for hawaii does not support type3 nop packet.
Detect the new hawaii firmware with query RADEON_INFO_ACCEL_WORKING2.
If the returned value is 3, then the new firmware is used.

This patch uses type2 for the old firmware and type3 for the new firmware.

It fixes the cases when the old firmware is used and the user wants to
manually enable acceleration.
The two possible scenarios are:
 - the kernel has no support for the new firmware.
 - the kernel has support for the new firmware but only the old firmware
   is available.

Additionaly this patch disables GPU acceleration on hawaii if the kernel
returns a value < 2. In this case the kernel hasn't the required fixes
for proper acceleration.

v2:
 - Fix indentation
 - Use private struct radeon_drm_winsys instead of public struct radeon_info
 - Rename r600_accel_working2 to accel_working2

v3:
 - Use type2 nop packet for returned value < 3

v4:
 - Fail to initialize winsys for returned value < 2

Cc: mesa-stable@lists.freedesktop.org
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: Jérôme Glisse <jglisse@redhat.com>
Cc: Marek Olšák <marek.olsak@amd.com>
Cc: Michel Dänzer <michel.daenzer@amd.com>
Signed-off-by: Andreas Boll <andreas.boll.dev@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
mesa: Add the GL_ARB_texture_compression_bptc extension

This adds a boolean in the gl_extensions struct for
GL_ARB_texture_compression_bptc as well as an entry in extension_table.

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
mesa: Fix the base format for GL_COMPRESSED_RGB_BPTC_*_FLOAT_ARB

The signed and unsigned half-float BPTC-compressed formats were being reported
as having a base format of GL_RGBA but they don't store an alpha channel so it
should be GL_RGB.

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
mesa/format_info: Add support for compressed floating-point formats

If the name of a compressed texture format has ‘FLOAT’ in it it will now set
the data type of the format to GL_FLOAT. This will be needed for the BPTC
half-float formats.

Reviewed-by: Jason Ekstrand <jason.ekstrand@intel.com>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
mesa/format_info: Add support for the BPTC layout

Adds the ‘bptc’ layout to get_channel_bits. The channel bits for BPTC depend
on the mode but as it only has to be an approximation this sets it to 8 for
the two UNORM formats and 16 for the two half-float formats. These represent
the minimum number of bits of variation that can be generated by the
interpolation of the two formats.

This doesn't quite match what we do for S3TC which only returns 4 even though
it can similarly generate 8 bits from the interpolation. However it does match
what we return for ETC2. For reference, NVidia seems to return 8 bits for the
UNORM formats and 32 bits for the half-float formats.

v2: Change the number of bits to 8/8/8/8 for the UNORM formats and 16/16/16
    for the half-float formats.

Reviewed-by: Jason Ekstrand <jason.ekstrand@intel.com>
mesa: Add the format enums for BPTC-compressed images

This adds the following four Mesa image format enums which correspond to the
four BPTC compressed texture formats:

 MESA_FORMAT_BPTC_RGBA_UNORM
 MESA_FORMAT_BPTC_SRGB_ALPHA_UNORM
 MESA_FORMAT_BPTC_RGB_SIGNED_FLOAT
 MESA_FORMAT_BPTC_RGB_UNSIGNED_FLOAT

It also updates the format information functions to handle these and the
corresponding GL enums.

v2: Also modify _mesa_get_format_color_encoding, _mesa_get_srgb_format_linear
    and _mesa_get_uncompressed_format

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
mesa: Add texel fetch functions for BPTC-compressed textures

Adds functions to fetch from any of the four BPTC-compressed formats.

v2: Set the alpha component to 1.0 when fetching from the half-float formats
    instead of leaving it uninitialised. Don't linearize the alpha component
    when fetching from sRGB.

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
mesa: Add texstore functions for BPTC-compressed textures

This adds compressors for all four of the BPTC compressed-texture formats. The
compressor is written from scratch and takes a very simple approach. It always
uses a single mode of the BPTC format (4 for unorm and 3 for half-floats) and
picks the two endpoints by dividing the texels into those which have more or
less than the average luminance of the block and then calculating an average
color of the texels within each division.

It's probably not really sensible to try to use BPTC compression at runtime
because for example with the Nvidia offline compression tool it can take in
the order of an hour to compress a full-screen image. With that in mind I
don't think it's worth having a proper compressor in Mesa and this approach
gives reasonable results for a usage that is basically a corner case.

v2: Always use the custom compressor, even for the unorm formats. Fix the
    quantization step for the half-float format compressor. Fixed a typo which
    was breaking the right-hand edge of half-float textures with a width that
    isn't a multiple of four.

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
mesa/main: Modify generate_mipmap_compressed to cope with float textures

Once we add BPTC texture support we will need to generate mipmaps for
compressed floating point textures too. Most of the code seems to already be
there but it just needs a few extra lines to get it to use GL_FLOAT instead of
GL_UNSIGNED_BYTE as the type for the temporary buffers.

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
i965: Enable the GL_ARB_texture_compression_bptc extension

Enables the BPTC extension on Gen>=7 and adds the necessary format mappings to
get the right surface type value.

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
swrast: Enable GL_ARB_texture_compression_bptc

Enables BPTC texture compression on the software rasterizer.

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
mesa/meta: Support decompressing floating-point formats

Previously the Meta implementation of glGetTexImage would fall back to
_mesa_get_teximage if the texturing is not using an unsigned normalised
format. However in order to support the half-float formats of BPTC textures we
can make it render to a floating-point renderbuffer instead. This patch makes
decompression_state have two FBOs, one for the GL_RGBA format and one for
GL_RGBA32F. If a floating-point texture is encountered it will try setting up
a floating-point FBO. It will now also check the status of the FBO and fall
back to _mesa_get_teximage if the FBO is not complete.

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
docs: Update release notes and GL3.txt for GL_ARB_texture_compression_bptc

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>