src/gallium/auxiliary/util/u_screen.c

   1 /*
   2  * Copyright © 2018 Broadcom
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21  * IN THE SOFTWARE.
  22  */
  23
  24 #include "pipe/p_screen.h"
  25 #include "util/u_screen.h"
  26
  27 /**
  28  * Helper to use from a pipe_screen->get_param() implementation to return
  29  * default values for unsupported PIPE_CAPs.
  30  *
  31  * Call this function from your pipe_screen->get_param() implementation's
  32  * default case, so that implementors of new pipe caps don't need to
  33  */
  34 int
  35 u_pipe_screen_get_param_defaults(struct pipe_screen *pscreen,
  36                                  enum pipe_cap param)
  37 {
  38    /* Let's keep these sorted by position in p_defines.h. */
  39    switch (param) {
  40    case PIPE_CAP_NPOT_TEXTURES:
  41    case PIPE_CAP_MAX_DUAL_SOURCE_RENDER_TARGETS:
  42    case PIPE_CAP_ANISOTROPIC_FILTER:
  43    case PIPE_CAP_POINT_SPRITE:
  44       return 0;
  45
  46    case PIPE_CAP_GRAPHICS:
  47    case PIPE_CAP_MAX_RENDER_TARGETS:
  48       return 1;
  49
  50    case PIPE_CAP_OCCLUSION_QUERY:
  51    case PIPE_CAP_QUERY_TIME_ELAPSED:
  52    case PIPE_CAP_TEXTURE_SWIZZLE:
  53       return 0;
  54
  55    case PIPE_CAP_MAX_TEXTURE_2D_SIZE:
  56    case PIPE_CAP_MAX_TEXTURE_3D_LEVELS:
  57    case PIPE_CAP_MAX_TEXTURE_CUBE_LEVELS:
  58       unreachable("driver must implement these.");
  59
  60    case PIPE_CAP_TEXTURE_MIRROR_CLAMP:
  61    case PIPE_CAP_BLEND_EQUATION_SEPARATE:
  62    case PIPE_CAP_FRAGMENT_SHADER_TEXTURE_LOD:
  63    case PIPE_CAP_FRAGMENT_SHADER_DERIVATIVES:
  64    case PIPE_CAP_VERTEX_SHADER_SATURATE:
  65    case PIPE_CAP_MAX_STREAM_OUTPUT_BUFFERS: /* enables EXT_transform_feedback */
  66    case PIPE_CAP_PRIMITIVE_RESTART:
  67    case PIPE_CAP_PRIMITIVE_RESTART_FIXED_INDEX:
  68    case PIPE_CAP_INDEP_BLEND_ENABLE:
  69    case PIPE_CAP_INDEP_BLEND_FUNC:
  70    case PIPE_CAP_MAX_TEXTURE_ARRAY_LAYERS: /* Enables GL_EXT_texture_array */
  71    case PIPE_CAP_TGSI_FS_COORD_ORIGIN_UPPER_LEFT:
  72    case PIPE_CAP_TGSI_FS_COORD_ORIGIN_LOWER_LEFT:
  73    case PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_HALF_INTEGER:
  74    case PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_INTEGER:
  75    case PIPE_CAP_DEPTH_CLIP_DISABLE:
  76    case PIPE_CAP_DEPTH_CLIP_DISABLE_SEPARATE:
  77    case PIPE_CAP_SHADER_STENCIL_EXPORT:
  78    case PIPE_CAP_TGSI_INSTANCEID:
  79    case PIPE_CAP_VERTEX_ELEMENT_INSTANCE_DIVISOR:
  80    case PIPE_CAP_FRAGMENT_COLOR_CLAMPED:
  81    case PIPE_CAP_MIXED_COLORBUFFER_FORMATS:
  82    case PIPE_CAP_SEAMLESS_CUBE_MAP:
  83    case PIPE_CAP_SEAMLESS_CUBE_MAP_PER_TEXTURE:
  84    case PIPE_CAP_RGB_OVERRIDE_DST_ALPHA_BLEND:
  85       return 0;
  86
  87    case PIPE_CAP_MIN_TEXEL_OFFSET:
  88       /* GL 3.x minimum value. */
  89       return -8;
  90    case PIPE_CAP_MAX_TEXEL_OFFSET:
  91       return 7;
  92
  93    case PIPE_CAP_CONDITIONAL_RENDER:
  94    case PIPE_CAP_TEXTURE_BARRIER:
  95       return 0;
  96
  97    case PIPE_CAP_MAX_STREAM_OUTPUT_SEPARATE_COMPONENTS:
  98       /* GL_EXT_transform_feedback minimum value. */
  99       return 4;
 100    case PIPE_CAP_MAX_STREAM_OUTPUT_INTERLEAVED_COMPONENTS:
 101       return 64;
 102
 103    case PIPE_CAP_STREAM_OUTPUT_PAUSE_RESUME:
 104    case PIPE_CAP_TGSI_CAN_COMPACT_CONSTANTS:
 105    case PIPE_CAP_VERTEX_COLOR_UNCLAMPED:
 106    case PIPE_CAP_VERTEX_COLOR_CLAMPED:
 107       return 0;
 108
 109    case PIPE_CAP_GLSL_FEATURE_LEVEL:
 110    case PIPE_CAP_GLSL_FEATURE_LEVEL_COMPATIBILITY:
 111       /* Minimum GLSL level implemented by gallium drivers. */
 112       return 120;
 113
 114    case PIPE_CAP_ESSL_FEATURE_LEVEL:
 115       /* Tell gallium frontend to fallback to PIPE_CAP_GLSL_FEATURE_LEVEL */
 116       return 0;
 117
 118    case PIPE_CAP_QUADS_FOLLOW_PROVOKING_VERTEX_CONVENTION:
 119    case PIPE_CAP_USER_VERTEX_BUFFERS:
 120    case PIPE_CAP_VERTEX_BUFFER_OFFSET_4BYTE_ALIGNED_ONLY:
 121    case PIPE_CAP_VERTEX_BUFFER_STRIDE_4BYTE_ALIGNED_ONLY:
 122    case PIPE_CAP_VERTEX_ELEMENT_SRC_OFFSET_4BYTE_ALIGNED_ONLY:
 123    case PIPE_CAP_COMPUTE:
 124       return 0;
 125
 126    case PIPE_CAP_CONSTANT_BUFFER_OFFSET_ALIGNMENT:
 127       /* GL_UNIFORM_BUFFER_OFFSET_ALIGNMENT default value. */
 128       return 1;
 129
 130    case PIPE_CAP_START_INSTANCE:
 131    case PIPE_CAP_QUERY_TIMESTAMP:
 132    case PIPE_CAP_TEXTURE_MULTISAMPLE:
 133       return 0;
 134
 135    case PIPE_CAP_MIN_MAP_BUFFER_ALIGNMENT:
 136       /* GL_ARB_map_buffer_alignment minimum value. All drivers expose the
 137        * extension.
 138        */
 139       return 64;
 140
 141    case PIPE_CAP_CUBE_MAP_ARRAY:
 142    case PIPE_CAP_TEXTURE_BUFFER_OBJECTS:
 143       return 0;
 144
 145    case PIPE_CAP_TEXTURE_BUFFER_OFFSET_ALIGNMENT:
 146       /* GL_EXT_texture_buffer minimum value. */
 147       return 256;
 148
 149    case PIPE_CAP_BUFFER_SAMPLER_VIEW_RGBA_ONLY:
 150    case PIPE_CAP_TGSI_TEXCOORD:
 151       return 0;
 152
 153    case PIPE_CAP_PREFER_BLIT_BASED_TEXTURE_TRANSFER:
 154       return 1;
 155
 156    case PIPE_CAP_QUERY_PIPELINE_STATISTICS:
 157    case PIPE_CAP_QUERY_PIPELINE_STATISTICS_SINGLE:
 158    case PIPE_CAP_TEXTURE_BORDER_COLOR_QUIRK:
 159       return 0;
 160
 161    case PIPE_CAP_MAX_TEXTURE_BUFFER_SIZE:
 162       /* GL_EXT_texture_buffer minimum value. */
 163       return 65536;
 164
 165    case PIPE_CAP_MAX_VIEWPORTS:
 166       return 1;
 167
 168    case PIPE_CAP_ENDIANNESS:
 169       return PIPE_ENDIAN_LITTLE;
 170
 171    case PIPE_CAP_MIXED_FRAMEBUFFER_SIZES:
 172    case PIPE_CAP_TGSI_VS_LAYER_VIEWPORT:
 173    case PIPE_CAP_MAX_GEOMETRY_OUTPUT_VERTICES:
 174    case PIPE_CAP_MAX_GEOMETRY_TOTAL_OUTPUT_COMPONENTS:
 175    case PIPE_CAP_MAX_TEXTURE_GATHER_COMPONENTS: /* Enables ARB_texture_gather */
 176    case PIPE_CAP_TEXTURE_GATHER_SM5:
 177    case PIPE_CAP_BUFFER_MAP_PERSISTENT_COHERENT:
 178    case PIPE_CAP_FAKE_SW_MSAA:
 179    case PIPE_CAP_TEXTURE_QUERY_LOD:
 180       return 0;
 181
 182    case PIPE_CAP_MIN_TEXTURE_GATHER_OFFSET:
 183       return -8;
 184    case PIPE_CAP_MAX_TEXTURE_GATHER_OFFSET:
 185       return 7;
 186
 187    case PIPE_CAP_SAMPLE_SHADING:
 188    case PIPE_CAP_TEXTURE_GATHER_OFFSETS:
 189    case PIPE_CAP_TGSI_VS_WINDOW_SPACE_POSITION:
 190    case PIPE_CAP_MAX_VERTEX_STREAMS:
 191    case PIPE_CAP_DRAW_INDIRECT:
 192    case PIPE_CAP_TGSI_FS_FINE_DERIVATIVE:
 193       return 0;
 194
 195    case PIPE_CAP_VENDOR_ID:
 196    case PIPE_CAP_DEVICE_ID:
 197       return 0xffffffff;
 198
 199    case PIPE_CAP_ACCELERATED:
 200    case PIPE_CAP_VIDEO_MEMORY:
 201    case PIPE_CAP_UMA:
 202       unreachable("driver must implement these.");
 203
 204    case PIPE_CAP_CONDITIONAL_RENDER_INVERTED:
 205       return 0;
 206
 207    case PIPE_CAP_MAX_VERTEX_ATTRIB_STRIDE:
 208       /* GL minimum value */
 209       return 2048;
 210
 211    case PIPE_CAP_SAMPLER_VIEW_TARGET:
 212    case PIPE_CAP_CLIP_HALFZ:
 213    case PIPE_CAP_VERTEXID_NOBASE:
 214    case PIPE_CAP_POLYGON_OFFSET_CLAMP:
 215    case PIPE_CAP_MULTISAMPLE_Z_RESOLVE:
 216    case PIPE_CAP_RESOURCE_FROM_USER_MEMORY:
 217    case PIPE_CAP_RESOURCE_FROM_USER_MEMORY_COMPUTE_ONLY:
 218    case PIPE_CAP_DEVICE_RESET_STATUS_QUERY:
 219    case PIPE_CAP_MAX_SHADER_PATCH_VARYINGS:
 220    case PIPE_CAP_TEXTURE_FLOAT_LINEAR:
 221    case PIPE_CAP_TEXTURE_HALF_FLOAT_LINEAR:
 222    case PIPE_CAP_DEPTH_BOUNDS_TEST:
 223    case PIPE_CAP_TGSI_TXQS:
 224    case PIPE_CAP_FORCE_PERSAMPLE_INTERP:
 225    case PIPE_CAP_SHAREABLE_SHADERS:
 226    case PIPE_CAP_COPY_BETWEEN_COMPRESSED_AND_PLAIN_FORMATS:
 227    case PIPE_CAP_CLEAR_TEXTURE:
 228    case PIPE_CAP_CLEAR_SCISSORED:
 229    case PIPE_CAP_DRAW_PARAMETERS:
 230    case PIPE_CAP_TGSI_PACK_HALF_FLOAT:
 231    case PIPE_CAP_MULTI_DRAW_INDIRECT:
 232    case PIPE_CAP_MULTI_DRAW_INDIRECT_PARAMS:
 233    case PIPE_CAP_TGSI_FS_POSITION_IS_SYSVAL:
 234    case PIPE_CAP_TGSI_FS_POINT_IS_SYSVAL:
 235    case PIPE_CAP_TGSI_FS_FACE_IS_INTEGER_SYSVAL:
 236       return 0;
 237
 238    case PIPE_CAP_SHADER_BUFFER_OFFSET_ALIGNMENT:
 239       /* Enables GL_ARB_shader_storage_buffer_object */
 240       return 0;
 241
 242    case PIPE_CAP_INVALIDATE_BUFFER:
 243    case PIPE_CAP_GENERATE_MIPMAP:
 244    case PIPE_CAP_STRING_MARKER:
 245    case PIPE_CAP_SURFACE_REINTERPRET_BLOCKS:
 246    case PIPE_CAP_QUERY_BUFFER_OBJECT:
 247    case PIPE_CAP_QUERY_MEMORY_INFO: /* Enables GL_ATI_meminfo */
 248       return 0;
 249
 250    case PIPE_CAP_PCI_GROUP:
 251    case PIPE_CAP_PCI_BUS:
 252    case PIPE_CAP_PCI_DEVICE:
 253    case PIPE_CAP_PCI_FUNCTION:
 254       unreachable("driver must implement these.");
 255
 256    case PIPE_CAP_FRAMEBUFFER_NO_ATTACHMENT:
 257    case PIPE_CAP_ROBUST_BUFFER_ACCESS_BEHAVIOR:
 258    case PIPE_CAP_CULL_DISTANCE:
 259    case PIPE_CAP_PRIMITIVE_RESTART_FOR_PATCHES:
 260    case PIPE_CAP_TGSI_VOTE:
 261    case PIPE_CAP_MAX_WINDOW_RECTANGLES: /* Enables EXT_window_rectangles */
 262    case PIPE_CAP_POLYGON_OFFSET_UNITS_UNSCALED:
 263    case PIPE_CAP_VIEWPORT_SUBPIXEL_BITS:
 264    case PIPE_CAP_VIEWPORT_SWIZZLE:
 265    case PIPE_CAP_VIEWPORT_MASK:
 266    case PIPE_CAP_MIXED_COLOR_DEPTH_BITS:
 267    case PIPE_CAP_TGSI_ARRAY_COMPONENTS:
 268    case PIPE_CAP_STREAM_OUTPUT_INTERLEAVE_BUFFERS:
 269    case PIPE_CAP_TGSI_CAN_READ_OUTPUTS:
 270    case PIPE_CAP_NATIVE_FENCE_FD:
 271       return 0;
 272
 273    case PIPE_CAP_RASTERIZER_SUBPIXEL_BITS:
 274       return 4; /* GLES 2.0 minimum value */
 275
 276    case PIPE_CAP_GLSL_OPTIMIZE_CONSERVATIVELY:
 277       return 1;
 278
 279    case PIPE_CAP_GLSL_TESS_LEVELS_AS_INPUTS:
 280       return 0;
 281
 282    case PIPE_CAP_FBFETCH:
 283    case PIPE_CAP_FBFETCH_COHERENT:
 284    case PIPE_CAP_TGSI_MUL_ZERO_WINS:
 285    case PIPE_CAP_DOUBLES:
 286    case PIPE_CAP_INT64:
 287    case PIPE_CAP_INT64_DIVMOD:
 288    case PIPE_CAP_TGSI_TEX_TXF_LZ:
 289    case PIPE_CAP_TGSI_CLOCK:
 290    case PIPE_CAP_POLYGON_MODE_FILL_RECTANGLE:
 291    case PIPE_CAP_SPARSE_BUFFER_PAGE_SIZE:
 292    case PIPE_CAP_TGSI_BALLOT:
 293    case PIPE_CAP_TGSI_TES_LAYER_VIEWPORT:
 294    case PIPE_CAP_CAN_BIND_CONST_BUFFER_AS_VERTEX:
 295    case PIPE_CAP_TGSI_DIV:
 296       return 0;
 297
 298    case PIPE_CAP_ALLOW_MAPPED_BUFFERS_DURING_EXECUTION:
 299       /* Drivers generally support this, and it reduces GL overhead just to
 300        * throw an error when buffers are mapped.
 301        */
 302       return 1;
 303
 304    case PIPE_CAP_PREFER_IMM_ARRAYS_AS_CONSTBUF:
 305       /* Don't unset this unless your driver can do better */
 306       return 1;
 307
 308    case PIPE_CAP_POST_DEPTH_COVERAGE:
 309    case PIPE_CAP_BINDLESS_TEXTURE:
 310    case PIPE_CAP_NIR_SAMPLERS_AS_DEREF:
 311    case PIPE_CAP_NIR_COMPACT_ARRAYS:
 312    case PIPE_CAP_QUERY_SO_OVERFLOW:
 313    case PIPE_CAP_MEMOBJ:
 314    case PIPE_CAP_LOAD_CONSTBUF:
 315    case PIPE_CAP_TGSI_ANY_REG_AS_ADDRESS:
 316    case PIPE_CAP_TILE_RASTER_ORDER:
 317       return 0;
 318
 319    case PIPE_CAP_MAX_COMBINED_SHADER_OUTPUT_RESOURCES:
 320       /* nonzero overrides defaults */
 321       return 0;
 322
 323    case PIPE_CAP_FRAMEBUFFER_MSAA_CONSTRAINTS:
 324    case PIPE_CAP_SIGNED_VERTEX_BUFFER_OFFSET:
 325    case PIPE_CAP_CONTEXT_PRIORITY_MASK:
 326    case PIPE_CAP_FENCE_SIGNAL:
 327    case PIPE_CAP_CONSTBUF0_FLAGS:
 328    case PIPE_CAP_PACKED_UNIFORMS:
 329    case PIPE_CAP_CONSERVATIVE_RASTER_POST_SNAP_TRIANGLES:
 330    case PIPE_CAP_CONSERVATIVE_RASTER_POST_SNAP_POINTS_LINES:
 331    case PIPE_CAP_CONSERVATIVE_RASTER_PRE_SNAP_TRIANGLES:
 332    case PIPE_CAP_CONSERVATIVE_RASTER_PRE_SNAP_POINTS_LINES:
 333    case PIPE_CAP_MAX_CONSERVATIVE_RASTER_SUBPIXEL_PRECISION_BIAS:
 334    case PIPE_CAP_CONSERVATIVE_RASTER_POST_DEPTH_COVERAGE:
 335    case PIPE_CAP_CONSERVATIVE_RASTER_INNER_COVERAGE:
 336    case PIPE_CAP_PROGRAMMABLE_SAMPLE_LOCATIONS:
 337    case PIPE_CAP_MAX_COMBINED_SHADER_BUFFERS:
 338    case PIPE_CAP_MAX_COMBINED_HW_ATOMIC_COUNTERS:
 339    case PIPE_CAP_MAX_COMBINED_HW_ATOMIC_COUNTER_BUFFERS:
 340    case PIPE_CAP_TGSI_ATOMFADD:
 341    case PIPE_CAP_TGSI_SKIP_SHRINK_IO_ARRAYS:
 342    case PIPE_CAP_IMAGE_LOAD_FORMATTED:
 343    case PIPE_CAP_PREFER_COMPUTE_FOR_MULTIMEDIA:
 344    case PIPE_CAP_FRAGMENT_SHADER_INTERLOCK:
 345    case PIPE_CAP_CS_DERIVED_SYSTEM_VALUES_SUPPORTED:
 346    case PIPE_CAP_ATOMIC_FLOAT_MINMAX:
 347    case PIPE_CAP_SHADER_SAMPLES_IDENTICAL:
 348    case PIPE_CAP_TGSI_ATOMINC_WRAP:
 349    case PIPE_CAP_TGSI_TG4_COMPONENT_IN_SWIZZLE:
 350    case PIPE_CAP_GLSL_ZERO_INIT:
 351       return 0;
 352
 353    case PIPE_CAP_MAX_GS_INVOCATIONS:
 354       return 32;
 355
 356    case PIPE_CAP_MAX_SHADER_BUFFER_SIZE:
 357       return 1 << 27;
 358
 359    case PIPE_CAP_TEXTURE_MIRROR_CLAMP_TO_EDGE:
 360    case PIPE_CAP_MAX_TEXTURE_UPLOAD_MEMORY_BUDGET:
 361       return 0;
 362
 363    case PIPE_CAP_MAX_VERTEX_ELEMENT_SRC_OFFSET:
 364       return 2047;
 365
 366    case PIPE_CAP_SURFACE_SAMPLE_COUNT:
 367       return 0;
 368    case PIPE_CAP_DEST_SURFACE_SRGB_CONTROL:
 369       return 1;
 370
 371    case PIPE_CAP_MAX_VARYINGS:
 372       return 8;
 373
 374    case PIPE_CAP_COMPUTE_GRID_INFO_LAST_BLOCK:
 375       return 0;
 376
 377    case PIPE_CAP_COMPUTE_SHADER_DERIVATIVES:
 378       return 0;
 379
 380    case PIPE_CAP_THROTTLE:
 381       return 1;
 382
 383    case PIPE_CAP_TEXTURE_SHADOW_LOD:
 384       return 0;
 385
 386    case PIPE_CAP_GL_SPIRV:
 387    case PIPE_CAP_GL_SPIRV_VARIABLE_POINTERS:
 388       return 0;
 389
 390    case PIPE_CAP_DEMOTE_TO_HELPER_INVOCATION:
 391       return 0;
 392
 393    case PIPE_CAP_DMABUF:
 394 #if defined(PIPE_OS_LINUX) || defined(PIPE_OS_BSD)
 395       return 1;
 396 #else
 397       return 0;
 398 #endif
 399
 400    case PIPE_CAP_TEXTURE_SHADOW_MAP: /* Enables ARB_shadow */
 401       return 1;
 402
 403    case PIPE_CAP_FLATSHADE:
 404    case PIPE_CAP_ALPHA_TEST:
 405    case PIPE_CAP_POINT_SIZE_FIXED:
 406    case PIPE_CAP_TWO_SIDED_COLOR:
 407    case PIPE_CAP_CLIP_PLANES:
 408       return 1;
 409
 410    case PIPE_CAP_MAX_VERTEX_BUFFERS:
 411       return 16;
 412
 413    case PIPE_CAP_OPENCL_INTEGER_FUNCTIONS:
 414    case PIPE_CAP_INTEGER_MULTIPLY_32X16:
 415    case PIPE_CAP_DRAW_INFO_START_WITH_USER_INDICES:
 416       return 0;
 417    case PIPE_CAP_NIR_IMAGES_AS_DEREF:
 418       return 1;
 419
 420    case PIPE_CAP_FRONTEND_NOOP:
 421       /* Enables INTEL_blackhole_render */
 422       return 0;
 423
 424    case PIPE_CAP_PACKED_STREAM_OUTPUT:
 425       return 1;
 426
 427    case PIPE_CAP_VIEWPORT_TRANSFORM_LOWERED:
 428    case PIPE_CAP_PSIZ_CLAMPED:
 429    case PIPE_CAP_MAP_UNSYNCHRONIZED_THREAD_SAFE:
 430       return 0;
 431
 432    case PIPE_CAP_GL_BEGIN_END_BUFFER_SIZE:
 433       return 512 * 1024;
 434
 435    case PIPE_CAP_SYSTEM_SVM:
 436    case PIPE_CAP_ALPHA_TO_COVERAGE_DITHER_CONTROL:
 437       return 0;
 438
 439    default:
 440       unreachable("bad PIPE_CAP_*");
 441    }
 442 }