docs: add release notes for 21.1.2

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/11148>

docs/relnotes/21.1.2.rst

@@ -0,0 +1,176 @@
+Mesa 21.1.2 Release Notes / 2021-06-02
+======================================
+
+Mesa 21.1.2 is a bug fix release which fixes bugs found since the 21.1.1 release.
+
+Mesa 21.1.2 implements the OpenGL 4.6 API, but the version reported by
+glGetString(GL_VERSION) or glGetIntegerv(GL_MAJOR_VERSION) /
+glGetIntegerv(GL_MINOR_VERSION) depends on the particular driver being used.
+Some drivers don't support all the features required in OpenGL 4.6. OpenGL
+4.6 is **only** available if requested at context creation.
+Compatibility contexts may report a lower version depending on each driver.
+
+Mesa 21.1.2 implements the Vulkan 1.2 API, but the version reported by
+the apiVersion property of the VkPhysicalDeviceProperties struct
+depends on the particular driver being used.
+
+SHA256 checksum
+---------------
+
+::
+
+    23b4b63760561f3a4f98b5be12c6de621e9a6bdf355e087a83d9184cd4e2825f  mesa-21.1.2.tar.xz
+
+
+New features
+------------
+
+- None
+
+
+Bug fixes
+---------
+
+- zink: regression for primitive-restart on ANV
+- zink: Expected Image Operand ConstOffset to be a const object
+- [RADV] - Path of Exile (238960) - Ground decals are missing or corrupted using the Vulkan renderer.
+- [ADL-S / TGL-U / TGL-H] Pixels missing / flickering when render some app on weston
+- panfrost ff9a0000.gpu: Unhandled Page fault in AS1 at VA 0x0000000009801200
+- mesa-21.1.1/src/gallium/drivers/vc4/vc4_resource.c:790: reading from uninitialised array
+- [iris,i965][hsw,ivb,snb,bdw][bisected][regression] wflinfo crashes
+- [iris,i965][hsw,ivb,snb,bdw][bisected][regression] wflinfo crashes
+- piglit test 'spec.glsl-1_30.execution.range_analysis_fsat_of_nan' failure
+
+
+Changes
+-------
+
+Adam Jackson (1):
+
+- zink/ntv: Don't call free() on ralloc'd memory
+
+Alyssa Rosenzweig (3):
+
+- panfrost: Fix the reads_dest prototype
+- panfrost: Fix is_opaque prototype
+- panfrost: Increase tiler_heap max allocation to 64MB
+
+Anuj Phogat (1):
+
+- intel/gfx12+: Add Wa_14013840143
+
+Charmaine Lee (1):
+
+- svga: fix texture rectangle sampling when no sampler view declaration is defined
+
+Emma Anholt (2):
+
+- i915g: Disable 3D-pipeline clears.
+- i915g: Add support for the .Absolute flag on TGSI srcs.
+
+Eric Anholt (1):
+
+- i915g: Stop advertising support for indirect addressing in the FS.
+
+Eric Engestrom (7):
+
+- .pick_status.json: Update to 17861aff9614abfea3b8a8f111a114b26b351915
+- pick-ui & .pick_status.json: rename \`master_sha` to \`main_sha`
+- .pick_status.json: Update to b663c544177e9547793ee405887f0d41c50e6d1d
+- .pick_status.json: Update to 507e8907af913ab7b89211240568b8002b3475f1
+- .pick_status.json: Update to 3179daf61393ee8a0fac943b94335b114e34873b
+- .pick_status.json: Update to 761383720617b46617bd278ec6015c9520f43f5c
+- .pick_status.json: Update to 1199d86b2cccc38a101e63bdf9b60a7391f96092
+
+Erik Faye-Lund (2):
+
+- zink: use actual const for const offset
+- util/prim_restart: revert part of bad fix
+
+Erik Kurzinger (1):
+
+- vulkan/device_select: avoid segfault on Wayland if wl_drm is unavailable
+
+Georg Lehmann (1):
+
+- radv: Fix compatible image handle type for dmabufs.
+
+Ian Romanick (2):
+
+- nir/algebraic: Remove some optimizations of comparisons with fsat
+- nir/algebraic: Invert comparisons less often
+
+Icecream95 (1):
+
+- panfrost: Fix polygon list size computations
+
+Italo Nicola (1):
+
+- panfrost: fix GL_EXT_multisampled_render_to_texture regression
+
+Jason Ekstrand (3):
+
+- anv: Plumb the shader into push constant helpers
+- anv: Support pushing shader constants
+- intel/vec4: Don't spill fp64 registers more than once
+
+José Fonseca (1):
+
+- draw: Allocate extra padding for extra shader outputs.
+
+Juan A. Suarez Romero (1):
+
+- vc4: initialize array
+
+Kenneth Graunke (2):
+
+- i965: Don't advertise Y-tiled modifiers for scanout buffers on Gfx8-
+- iris: Don't advertise Y-tiled modifiers for scanout buffers on Gfx8
+
+Marek Olšák (3):
+
+- ac/gpu_info: set has_zero_index_buffer_bug for Navi12 too
+- radeonsi: add a gfx10 hw bug workaround with the barrier before gs_alloc_req
+- radeonsi: disable DFSM on gfx9 by default because it decreases performance a lot
+
+Mike Blumenkrantz (4):
+
+- util/prim_restart: fix util_translate_prim_restart_ib
+- aux/vbuf: prevent uint underflow and assert if no vbs are dirty
+- aux/trace: fix set_inlinable_constants hook
+- zink: remove weird lod hack for texturing
+
+Nanley Chery (2):
+
+- anv,iris: Port the D16 workaround stalls to BLORP
+- intel/isl: Fix HiZ+CCS comment about ambiguates
+
+Neha Bhende (2):
+
+- svga: Add target and sampler_return_type info into shader key
+- svga: Use shader_key info to declare resources if TGSI shader is missing it
+
+Rhys Perry (3):
+
+- aco: disallow SGPRs on DPP instructions
+- radv: add radv_absolute_depth_bias
+- radv: workaround incorrect depthBiasConstantFactor by Path of Exile
+
+Robert Tarasov (1):
+
+- iris: Check data alignment for copy_mem_mem
+
+Samuel Pitoiset (4):
+
+- aco: fix derivatives/intrinsics with SGPR sources
+- radv: fix fast clearing DCC if one level can't be compressed on GFX10+
+- aco: fix emitting discard when the program just ends
+- radv: enable RADV_DEBUG=invariantgeom for Monster Hunter World
+
+SureshGuttula (1):
+
+- frontends/va/picture:Fix wrong reallocation even surface is protected
+
+cheyang (1):
+
+- virgl:Fix the leak of hw_res used as fence