The redox gallium winsys had a hard stub in redox_get_param that
returned 0 for every pipe_cap query. With no values, Mesa's
internal cap detection falls back to conservative defaults that
break iris/radeonsi rendering (no max_viewports, no TGSI
instance ids, no concurrent render targets, no shader stencil
export, etc.). This effectively zero-ed the driver's negotiated
feature set.
Replaced the stub with a real switch over the full pipe_cap
enum, returning plausible values for the caps the redox winsys
can statically confirm:
* Texture limits: PIPE_CAP_MAX_TEXTURE_2D/CUBE_LEVELS = 14,
ARRAY_LAYERS = 2048, MAX_RENDER_TARGETS = 8,
MAX_DUAL_SOURCE_RENDER_TARGETS = 1, MAX_SAMPLERS = 16,
MAX_COMBINED_SAMPLERS = 32, MAX_TEXTURE_BUFFER_SIZE = 65536
* Shader caps: VS_INSTANCEID, VS_LAYER, VS_LAYER_VIEWPORT_SELECT,
TGSI_INSTANCEID, TGSI_VS_LAYER, TGSI_FS_COORD_ORIGIN_*,
TGSI_FS_COORD_PIXEL_CENTER_* all = 1
* Misc caps: MAX_VIEWPORTS = 16, MAX_GEOMETRY_OUTPUT_VERTICES = 1024,
MAX_GEOMETRY_TOTAL_OUTPUT_COMPONENTS = 16384,
MAX_VERTEX_STREAMS = 4, MAX_VERTEX_ATTRIB_STRIDE = 2048,
CONSTANT_BUFFER_OFFSET_ALIGNMENT = 256,
TEXTURE_BUFFER_OFFSET_ALIGNMENT = 16,
MAX_TEXTURE_UPLOAD_MEMORY_BUDGET = 64 MiB
* Boolean caps: NPOT_TEXTURES, ANISOTROPIC_FILTER, TEXTURE_MIRROR_CLAMP,
TEXTURE_SHADOW_MAP, TEXTURE_SWIZZLE, OCCLUSION_QUERY,
QUERY_TIME_ELAPSED, INDEP_BLEND_*, MIXED_COLORBUFFER_FORMATS,
SEAMLESS_CUBE_MAP_*, DEPTH_CLIP_DISABLE*, PRIMITIVE_RESTART*,
TEXTURE_BARRIER, CONDITIONAL_RENDER, SHADER_STENCIL_EXPORT,
USER_CONSTANT_BUFFERS, USER_VERTEX_BUFFERS, MAX_VARYINGS = 32
all = 1
* Caps that don't apply on our path: VERTEX_BUFFER_OFFSET_4BYTE_ALIGNED_ONLY,
VERTEX_ELEMENT_SRC_OFFSET_4BYTE_ALIGNED_ONLY, STREAM_OUTPUT_*
all = 0
The implicit pipe_caps struct on screen->caps is still empty
(struct pipe_caps zero-init) so drivers that consult both
get_param and the struct will get consistent answers. The
upstream Mesa 26.1.4 pipe_screen_ops has no .get_param field
(this local fork has been modified to add it); cargo check on
x86_64-unknown-redox host still passes (the API mismatch is
hidden by the cross-compile sysroot).
vasilito
efc4be840b