v5.228.0-rc1 This is a major release, bumping up the major version to v5 and dropping all APIs deprecated in v3.x. The other major breaking change of this release is a switch away from the external `libepoxy` OpenGL dependency in favor of the (optionally bundled) `glad` version 2. This is now included, along with various other build-time dependencies, as git submodules. Users are advised to clone with `git clone --recursive` in order to satisfy these dependencies automatically, while distros maintainers are nonetheless encouraged to continue packaging them. In addition, this release brings with it a number of new features and changes - including support for fully automatic GPU deinterlacing, error diffusion dithering, gamma-aware dithering, and a number of improvements to the handling of HDR sources and output displays, as well as several notable bug fixes and performance enhancements. Additions: - add `pl_gpu_limits.array_size_constants` to indicate whether or not push constants can be used to size arrays - add PL_HANDLE_MTL_TEX, PL_HANDLE_IOSURFACE and `pl_shared_mem.plane` to improve interop with MoltenVK - add the informational fields `pl_opengl.major, `pl_opengl.minor`, `pl_opengl_extensions` and the `pl_opengl_has_ext` utility function - add `pl_opengl_params.get_proc_addr` and `get_proc_addr_ex` - add `pl_deband_params.grain_neutral`, the effect of which is to scale down / disable adding noise near this value - add <libplacebo/shaders/deinterlacing.h>, containing a basic implementation of yadif, bob and weave - add support for deinterlacing metadata to `pl_render_params`, `pl_frame`, and `pl_source_frame` - add <libplacebo/shaders/dithering.h>, splitting this off from its previous location inside <libplacebo/shaders/colorspace.h> - add `pl_shader_error_diffusion` and related helper functions, as well as `pl_render_params.error_diffusion` - add `pl_dither_params.transfer` to support gamma-aware dithering - add `pl_icc_params.force_bpc` to help work around black point compensation issues on "broken" v4 and v2 profiles Changes: - fields and functions deprecated in libplacebo v3 have been removed - `python3-mako` is now bundled as a submodule to make resolving this dependency easier - drop `libepoxy` as a dependency, and require `glad` v2 instead, the latter of which is added as a submodule to make building easier - drop the `PL_STRUCT` transitional macro, and switch to a consistent API where e.g. `pl_tex` is a typedef of `const struct pl_tex_t *`. - `PL_LUT_CONVERSION` now explicitly overrides ICC profiles as well - HDR color spaces no longer default to having a black point of 0.005 nits, instead now defaulting to "true" black (1e-7 nits) - BT.1886 sources are now automatically tuned to match the swapchain / detected target contrast, rather than defaulting to 1000:1 - move `pl_queue_params.frame_duration` to `pl_source_frame.duration` - the `vulkan-link` and `opengl-loader` boolean meson options have been removed in favor of the `vk-proc-addr` and `gl-proc-addr` feature flags, defaulting to `auto` instead of `yes` - a copy of `vulkan.h` and `vk.xml` have been bundled as submodules to make satisfying these dependencies easier - `<libplacebo/opengl.h>`, `<libplacebo/vulkan.h>` and `<libplacebo/d3d11.h`> are now installed unconditonally, with stubs for `pl_vulkan_create` etc. available even if these features are disabled at compile time - `pl_render_info.index` no longer indicates the number of frames being mixed on PL_RENDER_STAGE_BLEND, instead being relegated to the new field `pl_render_info.count` Fixes and performance enhancements: - fix a bug where shaders with dynamically sized arrays would fail to compile on MoltenVK - reduce the frequency at which polar compute shaders need to be recompiled - fix compilation issues with MSVC - fix an issue where vulkan portability extensions were not correctly detected - fix a possible deadlock when using a multi-threaded opengl context - specify the correct calling convention for EGL debug callbacks - fix a bug where PL_INTENT_ABSOLUTE_COLORIMETRIC broke ICC profiles - improve the handling of perceptual ICC profiles, especially on "broken" v4 or v2 profiles - fix undefined behavior on 32-bit vulkan systems - fix bugs in the vulkan swapchain recreation - fix an issue where HDR metadata was not correctly reflected back to the renderer on vulkan swapchains - fix a bug where d3d11 swapchains failed being created on older versions of windows where high-bit-depth swapchains are unavailable - fix a bug where HDR metadata sent to the swapchain was not correctly inferred to valid values - `pl_shader_deband` has been rewritten to slightly improve performance, especially when the texture has more channels than necessary - `pl_shader_deband` no longer raises the black point due to clipping - fix build issues on GCC < 6 - improve validity of partially set `pl_color_space` structs - fix `pl_find_tone_map_function` not having an implementation - fix a bug where cubic spline frame mixing did not work in `plplay` - fix a memory leak in `pl_queue_destroy` - fix a bug where changing `pl_icc_params.max_luma` or `intent` did not correctly invalidate the ICC 3DLUT and renderer cache - greatly improve the performance and accuracy of 3DLUTs (ICC, .cube) - fix compilation on newer glslang and make this code forward-compatible - fix an issue where `pl_shader_dither` raised the apparent brightness of the image when dithering to low bit depths - fix compilation on vulkan systems with `vulkan.h` available but no vulkan loader - fix an issue where DV metadata requiring an EL was partially applied - fix an issue where PQ HDR sources were incorrectly assumed to have a black point scaled to the mastering display, rather than absolute zero - fix an issue where disabling `async_compute` led to undefined behavior on systems with async compute queues available - fix an issue where debanding was applied *after* user shaders, causing massive performance/quality loss in the case of user shaders that upscaled the input planes somehow - in exchange for a slight performance penalty when rendering a heavily cropped source image with debanding enabled - fix an issue where plane shaders were sometimes not correctly merged with the following image combination shader - fix an issue where inverse tone mapping did not work with `pl_tone_map_auto` - fix a massive performance regression in the non-compute fallback polar shader, especially on nvidia and apple systems - in exchange for a slight performance penalty on AMD systems - slightly boost the performance of shader LUTs in some very specific circumstances - fix an issue where nonlinear shader LUTs did not work on GLSL < 130