src/mesa/drivers/dri/i965/brw_state.h

   1 /*
   2  Copyright (C) Intel Corp.  2006.  All Rights Reserved.
   3  Intel funded Tungsten Graphics to
   4  develop this 3D driver.
   5
   6  Permission is hereby granted, free of charge, to any person obtaining
   7  a copy of this software and associated documentation files (the
   8  "Software"), to deal in the Software without restriction, including
   9  without limitation the rights to use, copy, modify, merge, publish,
  10  distribute, sublicense, and/or sell copies of the Software, and to
  11  permit persons to whom the Software is furnished to do so, subject to
  12  the following conditions:
  13
  14  The above copyright notice and this permission notice (including the
  15  next paragraph) shall be included in all copies or substantial
  16  portions of the Software.
  17
  18  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  19  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  21  IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
  22  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  23  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  24  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25
  26  **********************************************************************/
  27  /*
  28   * Authors:
  29   *   Keith Whitwell <keithw@vmware.com>
  30   */
  31
  32
  33 #ifndef BRW_STATE_H
  34 #define BRW_STATE_H
  35
  36 #include "brw_context.h"
  37 #include "brw_defines.h"
  38
  39 #ifdef __cplusplus
  40 extern "C" {
  41 #endif
  42
  43 enum intel_msaa_layout;
  44
  45 extern const struct brw_tracked_state brw_blend_constant_color;
  46 extern const struct brw_tracked_state brw_cc_vp;
  47 extern const struct brw_tracked_state brw_cc_unit;
  48 extern const struct brw_tracked_state brw_clip_unit;
  49 extern const struct brw_tracked_state brw_vs_pull_constants;
  50 extern const struct brw_tracked_state brw_tcs_pull_constants;
  51 extern const struct brw_tracked_state brw_tes_pull_constants;
  52 extern const struct brw_tracked_state brw_gs_pull_constants;
  53 extern const struct brw_tracked_state brw_wm_pull_constants;
  54 extern const struct brw_tracked_state brw_cs_pull_constants;
  55 extern const struct brw_tracked_state brw_constant_buffer;
  56 extern const struct brw_tracked_state brw_curbe_offsets;
  57 extern const struct brw_tracked_state brw_invariant_state;
  58 extern const struct brw_tracked_state brw_fs_samplers;
  59 extern const struct brw_tracked_state brw_gs_unit;
  60 extern const struct brw_tracked_state brw_line_stipple;
  61 extern const struct brw_tracked_state brw_aa_line_parameters;
  62 extern const struct brw_tracked_state brw_binding_table_pointers;
  63 extern const struct brw_tracked_state brw_depthbuffer;
  64 extern const struct brw_tracked_state brw_polygon_stipple_offset;
  65 extern const struct brw_tracked_state brw_polygon_stipple;
  66 extern const struct brw_tracked_state brw_recalculate_urb_fence;
  67 extern const struct brw_tracked_state brw_sf_unit;
  68 extern const struct brw_tracked_state brw_sf_vp;
  69 extern const struct brw_tracked_state brw_vs_samplers;
  70 extern const struct brw_tracked_state brw_tcs_samplers;
  71 extern const struct brw_tracked_state brw_tes_samplers;
  72 extern const struct brw_tracked_state brw_gs_samplers;
  73 extern const struct brw_tracked_state brw_cs_samplers;
  74 extern const struct brw_tracked_state brw_cs_texture_surfaces;
  75 extern const struct brw_tracked_state brw_vs_ubo_surfaces;
  76 extern const struct brw_tracked_state brw_vs_abo_surfaces;
  77 extern const struct brw_tracked_state brw_vs_image_surfaces;
  78 extern const struct brw_tracked_state brw_tcs_ubo_surfaces;
  79 extern const struct brw_tracked_state brw_tcs_abo_surfaces;
  80 extern const struct brw_tracked_state brw_tcs_image_surfaces;
  81 extern const struct brw_tracked_state brw_tes_ubo_surfaces;
  82 extern const struct brw_tracked_state brw_tes_abo_surfaces;
  83 extern const struct brw_tracked_state brw_tes_image_surfaces;
  84 extern const struct brw_tracked_state brw_gs_ubo_surfaces;
  85 extern const struct brw_tracked_state brw_gs_abo_surfaces;
  86 extern const struct brw_tracked_state brw_gs_image_surfaces;
  87 extern const struct brw_tracked_state brw_vs_unit;
  88 extern const struct brw_tracked_state brw_renderbuffer_surfaces;
  89 extern const struct brw_tracked_state brw_texture_surfaces;
  90 extern const struct brw_tracked_state brw_wm_binding_table;
  91 extern const struct brw_tracked_state brw_gs_binding_table;
  92 extern const struct brw_tracked_state brw_tes_binding_table;
  93 extern const struct brw_tracked_state brw_tcs_binding_table;
  94 extern const struct brw_tracked_state brw_vs_binding_table;
  95 extern const struct brw_tracked_state brw_wm_ubo_surfaces;
  96 extern const struct brw_tracked_state brw_wm_abo_surfaces;
  97 extern const struct brw_tracked_state brw_wm_image_surfaces;
  98 extern const struct brw_tracked_state brw_cs_ubo_surfaces;
  99 extern const struct brw_tracked_state brw_cs_abo_surfaces;
 100 extern const struct brw_tracked_state brw_cs_image_surfaces;
 101 extern const struct brw_tracked_state brw_wm_unit;
 102
 103 extern const struct brw_tracked_state brw_psp_urb_cbs;
 104
 105 extern const struct brw_tracked_state brw_drawing_rect;
 106 extern const struct brw_tracked_state brw_indices;
 107 extern const struct brw_tracked_state brw_vertices;
 108 extern const struct brw_tracked_state brw_index_buffer;
 109 extern const struct brw_tracked_state brw_cs_state;
 110 extern const struct brw_tracked_state gen7_cs_push_constants;
 111 extern const struct brw_tracked_state gen6_binding_table_pointers;
 112 extern const struct brw_tracked_state gen6_blend_state;
 113 extern const struct brw_tracked_state gen6_clip_state;
 114 extern const struct brw_tracked_state gen6_clip_vp;
 115 extern const struct brw_tracked_state gen6_color_calc_state;
 116 extern const struct brw_tracked_state gen6_depth_stencil_state;
 117 extern const struct brw_tracked_state gen6_gs_state;
 118 extern const struct brw_tracked_state gen6_gs_push_constants;
 119 extern const struct brw_tracked_state gen6_gs_binding_table;
 120 extern const struct brw_tracked_state gen6_multisample_state;
 121 extern const struct brw_tracked_state gen6_renderbuffer_surfaces;
 122 extern const struct brw_tracked_state gen6_sampler_state;
 123 extern const struct brw_tracked_state gen6_scissor_state;
 124 extern const struct brw_tracked_state gen6_sol_surface;
 125 extern const struct brw_tracked_state gen6_sf_state;
 126 extern const struct brw_tracked_state gen6_sf_vp;
 127 extern const struct brw_tracked_state gen6_urb;
 128 extern const struct brw_tracked_state gen6_viewport_state;
 129 extern const struct brw_tracked_state gen6_vs_push_constants;
 130 extern const struct brw_tracked_state gen6_vs_state;
 131 extern const struct brw_tracked_state gen6_wm_push_constants;
 132 extern const struct brw_tracked_state gen6_wm_state;
 133 extern const struct brw_tracked_state gen7_depthbuffer;
 134 extern const struct brw_tracked_state gen7_clip_state;
 135 extern const struct brw_tracked_state gen7_ds_state;
 136 extern const struct brw_tracked_state gen7_gs_state;
 137 extern const struct brw_tracked_state gen7_tcs_push_constants;
 138 extern const struct brw_tracked_state gen7_hs_state;
 139 extern const struct brw_tracked_state gen7_l3_state;
 140 extern const struct brw_tracked_state gen7_ps_state;
 141 extern const struct brw_tracked_state gen7_push_constant_space;
 142 extern const struct brw_tracked_state gen7_sbe_state;
 143 extern const struct brw_tracked_state gen7_sf_clip_viewport;
 144 extern const struct brw_tracked_state gen7_sf_state;
 145 extern const struct brw_tracked_state gen7_sol_state;
 146 extern const struct brw_tracked_state gen7_te_state;
 147 extern const struct brw_tracked_state gen7_tes_push_constants;
 148 extern const struct brw_tracked_state gen7_urb;
 149 extern const struct brw_tracked_state gen7_vs_state;
 150 extern const struct brw_tracked_state gen7_wm_state;
 151 extern const struct brw_tracked_state gen7_hw_binding_tables;
 152 extern const struct brw_tracked_state haswell_cut_index;
 153 extern const struct brw_tracked_state gen8_blend_state;
 154 extern const struct brw_tracked_state gen8_disable_stages;
 155 extern const struct brw_tracked_state gen8_ds_state;
 156 extern const struct brw_tracked_state gen8_gs_state;
 157 extern const struct brw_tracked_state gen8_hs_state;
 158 extern const struct brw_tracked_state gen8_index_buffer;
 159 extern const struct brw_tracked_state gen8_multisample_state;
 160 extern const struct brw_tracked_state gen8_pma_fix;
 161 extern const struct brw_tracked_state gen8_ps_blend;
 162 extern const struct brw_tracked_state gen8_ps_extra;
 163 extern const struct brw_tracked_state gen8_ps_state;
 164 extern const struct brw_tracked_state gen8_wm_depth_stencil;
 165 extern const struct brw_tracked_state gen8_wm_state;
 166 extern const struct brw_tracked_state gen8_raster_state;
 167 extern const struct brw_tracked_state gen8_sbe_state;
 168 extern const struct brw_tracked_state gen8_sf_state;
 169 extern const struct brw_tracked_state gen8_sf_clip_viewport;
 170 extern const struct brw_tracked_state gen8_vertices;
 171 extern const struct brw_tracked_state gen8_vf_topology;
 172 extern const struct brw_tracked_state gen8_vs_state;
 173 extern const struct brw_tracked_state brw_cs_work_groups_surface;
 174
 175 static inline bool
 176 brw_state_dirty(const struct brw_context *brw,
 177                 GLuint mesa_flags, uint64_t brw_flags)
 178 {
 179    return ((brw->NewGLState & mesa_flags) |
 180            (brw->ctx.NewDriverState & brw_flags)) != 0;
 181 }
 182
 183 /* brw_binding_tables.c */
 184 void brw_upload_binding_table(struct brw_context *brw,
 185                               uint32_t packet_name,
 186                               const struct brw_stage_prog_data *prog_data,
 187                               struct brw_stage_state *stage_state);
 188
 189 /* brw_misc_state.c */
 190 void brw_upload_invariant_state(struct brw_context *brw);
 191 uint32_t
 192 brw_depthbuffer_format(struct brw_context *brw);
 193
 194 void brw_upload_state_base_address(struct brw_context *brw);
 195
 196 /* gen8_depth_state.c */
 197 void gen8_write_pma_stall_bits(struct brw_context *brw,
 198                                uint32_t pma_stall_bits);
 199
 200 /***********************************************************************
 201  * brw_state.c
 202  */
 203 void brw_upload_render_state(struct brw_context *brw);
 204 void brw_render_state_finished(struct brw_context *brw);
 205 void brw_upload_compute_state(struct brw_context *brw);
 206 void brw_compute_state_finished(struct brw_context *brw);
 207 void brw_init_state(struct brw_context *brw);
 208 void brw_destroy_state(struct brw_context *brw);
 209 void brw_emit_select_pipeline(struct brw_context *brw,
 210                               enum brw_pipeline pipeline);
 211
 212 static inline void
 213 brw_select_pipeline(struct brw_context *brw, enum brw_pipeline pipeline)
 214 {
 215    if (unlikely(brw->last_pipeline != pipeline)) {
 216       assert(pipeline < BRW_NUM_PIPELINES);
 217       brw_emit_select_pipeline(brw, pipeline);
 218       brw->last_pipeline = pipeline;
 219    }
 220 }
 221
 222 /***********************************************************************
 223  * brw_state_cache.c
 224  */
 225
 226 void brw_upload_cache(struct brw_cache *cache,
 227                       enum brw_cache_id cache_id,
 228                       const void *key,
 229                       GLuint key_sz,
 230                       const void *data,
 231                       GLuint data_sz,
 232                       const void *aux,
 233                       GLuint aux_sz,
 234                       uint32_t *out_offset, void *out_aux);
 235
 236 bool brw_search_cache(struct brw_cache *cache,
 237                       enum brw_cache_id cache_id,
 238                       const void *key,
 239                       GLuint key_size,
 240                       uint32_t *inout_offset, void *inout_aux);
 241 void brw_state_cache_check_size( struct brw_context *brw );
 242
 243 void brw_init_caches( struct brw_context *brw );
 244 void brw_destroy_caches( struct brw_context *brw );
 245
 246 /***********************************************************************
 247  * brw_state_batch.c
 248  */
 249 #define BRW_BATCH_STRUCT(brw, s) \
 250    intel_batchbuffer_data(brw, (s), sizeof(*(s)), RENDER_RING)
 251
 252 void *__brw_state_batch(struct brw_context *brw,
 253                         enum aub_state_struct_type type,
 254                         int size,
 255                         int alignment,
 256                         int index,
 257                         uint32_t *out_offset);
 258 #define brw_state_batch(brw, type, size, alignment, out_offset) \
 259    __brw_state_batch(brw, type, size, alignment, 0, out_offset)
 260
 261 /* brw_wm_surface_state.c */
 262 void gen4_init_vtable_surface_functions(struct brw_context *brw);
 263 uint32_t brw_get_surface_tiling_bits(uint32_t tiling);
 264 uint32_t brw_get_surface_num_multisamples(unsigned num_samples);
 265
 266 uint32_t brw_format_for_mesa_format(mesa_format mesa_format);
 267
 268 GLuint translate_tex_target(GLenum target);
 269
 270 GLuint translate_tex_format(struct brw_context *brw,
 271                             mesa_format mesa_format,
 272                             GLenum srgb_decode);
 273
 274 int brw_get_texture_swizzle(const struct gl_context *ctx,
 275                             const struct gl_texture_object *t);
 276
 277 void brw_emit_surface_state(struct brw_context *brw,
 278                             struct intel_mipmap_tree *mt,
 279                             const struct isl_view *view,
 280                             uint32_t mocs, bool for_gather,
 281                             uint32_t *surf_offset, int surf_index,
 282                             unsigned read_domains, unsigned write_domains);
 283
 284 void brw_update_texture_surface(struct gl_context *ctx,
 285                                 unsigned unit, uint32_t *surf_offset,
 286                                 bool for_gather, uint32_t plane);
 287
 288 uint32_t brw_update_renderbuffer_surface(struct brw_context *brw,
 289                                          struct gl_renderbuffer *rb,
 290                                          bool layered, unsigned unit,
 291                                          uint32_t surf_index);
 292
 293 void brw_update_renderbuffer_surfaces(struct brw_context *brw,
 294                                       const struct gl_framebuffer *fb,
 295                                       uint32_t render_target_start,
 296                                       uint32_t *surf_offset);
 297
 298 /* gen7_wm_surface_state.c */
 299 uint32_t gen7_surface_tiling_mode(uint32_t tiling);
 300 uint32_t gen7_surface_msaa_bits(unsigned num_samples, enum intel_msaa_layout l);
 301 void gen7_set_surface_mcs_info(struct brw_context *brw,
 302                                uint32_t *surf,
 303                                uint32_t surf_offset,
 304                                const struct intel_mipmap_tree *mcs_mt,
 305                                bool is_render_target);
 306 void gen7_check_surface_setup(uint32_t *surf, bool is_render_target);
 307 void gen7_init_vtable_surface_functions(struct brw_context *brw);
 308
 309 /* gen8_ps_state.c */
 310 void gen8_upload_ps_state(struct brw_context *brw,
 311                           const struct brw_stage_state *stage_state,
 312                           const struct brw_wm_prog_data *prog_data,
 313                           uint32_t fast_clear_op);
 314
 315 void gen8_upload_ps_extra(struct brw_context *brw,
 316                           const struct brw_wm_prog_data *prog_data);
 317
 318 /* gen7_sol_state.c */
 319 void gen7_upload_3dstate_so_decl_list(struct brw_context *brw,
 320                                       const struct brw_vue_map *vue_map);
 321 void gen8_upload_3dstate_so_buffers(struct brw_context *brw);
 322
 323 /* gen8_surface_state.c */
 324
 325 void gen8_init_vtable_surface_functions(struct brw_context *brw);
 326
 327 unsigned gen8_surface_tiling_mode(uint32_t tiling);
 328 unsigned gen8_vertical_alignment(const struct brw_context *brw,
 329                                  const struct intel_mipmap_tree *mt,
 330                                  uint32_t surf_type);
 331 unsigned gen8_horizontal_alignment(const struct brw_context *brw,
 332                                    const struct intel_mipmap_tree *mt,
 333                                    uint32_t surf_type);
 334 uint32_t *gen8_allocate_surface_state(struct brw_context *brw,
 335                                       uint32_t *out_offset, int index);
 336
 337 void gen8_emit_fast_clear_color(const struct brw_context *brw,
 338                                 const struct intel_mipmap_tree *mt,
 339                                 uint32_t *surf);
 340 uint32_t gen8_get_aux_mode(const struct brw_context *brw,
 341                            const struct intel_mipmap_tree *mt);
 342
 343 /* brw_sampler_state.c */
 344 void brw_emit_sampler_state(struct brw_context *brw,
 345                             uint32_t *sampler_state,
 346                             uint32_t batch_offset_for_sampler_state,
 347                             unsigned min_filter,
 348                             unsigned mag_filter,
 349                             unsigned mip_filter,
 350                             unsigned max_anisotropy,
 351                             unsigned address_rounding,
 352                             unsigned wrap_s,
 353                             unsigned wrap_t,
 354                             unsigned wrap_r,
 355                             unsigned min_lod,
 356                             unsigned max_lod,
 357                             int lod_bias,
 358                             unsigned shadow_function,
 359                             bool non_normalized_coordinates,
 360                             uint32_t border_color_offset);
 361
 362 void brw_update_sampler_state(struct brw_context *brw,
 363                               GLenum target, bool tex_cube_map_seamless,
 364                               GLfloat tex_unit_lod_bias,
 365                               mesa_format format, GLenum base_format,
 366                               bool is_integer_format,
 367                               const struct gl_sampler_object *sampler,
 368                               uint32_t *sampler_state,
 369                               uint32_t batch_offset_for_sampler_state);
 370
 371 /* gen6_wm_state.c */
 372 void
 373 gen6_upload_wm_state(struct brw_context *brw,
 374                      const struct brw_wm_prog_data *prog_data,
 375                      const struct brw_stage_state *stage_state,
 376                      bool multisampled_fbo,
 377                      bool dual_source_blend_enable, bool kill_enable,
 378                      bool color_buffer_write_enable, bool msaa_enabled,
 379                      bool line_stipple_enable, bool polygon_stipple_enable,
 380                      bool statistic_enable);
 381
 382 /* gen6_sf_state.c */
 383 void
 384 calculate_attr_overrides(const struct brw_context *brw,
 385                          uint16_t *attr_overrides,
 386                          uint32_t *point_sprite_enables,
 387                          uint32_t *urb_entry_read_length,
 388                          uint32_t *urb_entry_read_offset);
 389
 390 /* gen6_surface_state.c */
 391 void gen6_init_vtable_surface_functions(struct brw_context *brw);
 392
 393 /* brw_vs_surface_state.c */
 394 void
 395 brw_upload_pull_constants(struct brw_context *brw,
 396                           GLbitfield64 brw_new_constbuf,
 397                           const struct gl_program *prog,
 398                           struct brw_stage_state *stage_state,
 399                           const struct brw_stage_prog_data *prog_data);
 400
 401 /* gen7_vs_state.c */
 402 void
 403 gen7_upload_constant_state(struct brw_context *brw,
 404                            const struct brw_stage_state *stage_state,
 405                            bool active, unsigned opcode);
 406
 407 void gen7_rs_control(struct brw_context *brw, int enable);
 408
 409 void gen7_edit_hw_binding_table_entry(struct brw_context *brw,
 410                                       gl_shader_stage stage,
 411                                       uint32_t index,
 412                                       uint32_t surf_offset);
 413 void gen7_update_binding_table_from_array(struct brw_context *brw,
 414                                           gl_shader_stage stage,
 415                                           const uint32_t* binding_table,
 416                                           int num_surfaces);
 417 void gen7_enable_hw_binding_tables(struct brw_context *brw);
 418 void gen7_disable_hw_binding_tables(struct brw_context *brw);
 419 void gen7_reset_hw_bt_pool_offsets(struct brw_context *brw);
 420
 421 /* brw_interpolation_map.c */
 422 void brw_setup_vue_interpolation(struct brw_context *brw);
 423
 424 /* brw_clip.c */
 425 void brw_upload_clip_prog(struct brw_context *brw);
 426
 427 /* brw_sf.c */
 428 void brw_upload_sf_prog(struct brw_context *brw);
 429
 430 /* gen7_l3_state.c */
 431 void
 432 gen7_restore_default_l3_config(struct brw_context *brw);
 433
 434 static inline bool
 435 is_drawing_points(const struct brw_context *brw)
 436 {
 437    /* Determine if the primitives *reaching the SF* are points */
 438    /* _NEW_POLYGON */
 439    if (brw->ctx.Polygon.FrontMode == GL_POINT ||
 440        brw->ctx.Polygon.BackMode == GL_POINT) {
 441       return true;
 442    }
 443
 444    if (brw->geometry_program) {
 445       /* BRW_NEW_GEOMETRY_PROGRAM */
 446       return brw->geometry_program->OutputType == GL_POINTS;
 447    } else if (brw->tes.prog_data) {
 448       /* BRW_NEW_TES_PROG_DATA */
 449       return brw->tes.prog_data->output_topology ==
 450              BRW_TESS_OUTPUT_TOPOLOGY_POINT;
 451    } else {
 452       /* BRW_NEW_PRIMITIVE */
 453       return brw->primitive == _3DPRIM_POINTLIST;
 454    }
 455 }
 456
 457 static inline bool
 458 is_drawing_lines(const struct brw_context *brw)
 459 {
 460    /* Determine if the primitives *reaching the SF* are points */
 461    /* _NEW_POLYGON */
 462    if (brw->ctx.Polygon.FrontMode == GL_LINE ||
 463        brw->ctx.Polygon.BackMode == GL_LINE) {
 464       return true;
 465    }
 466
 467    if (brw->geometry_program) {
 468       /* BRW_NEW_GEOMETRY_PROGRAM */
 469       return brw->geometry_program->OutputType == GL_LINE_STRIP;
 470    } else if (brw->tes.prog_data) {
 471       /* BRW_NEW_TES_PROG_DATA */
 472       return brw->tes.prog_data->output_topology ==
 473              BRW_TESS_OUTPUT_TOPOLOGY_LINE;
 474    } else {
 475       /* BRW_NEW_PRIMITIVE */
 476       switch (brw->primitive) {
 477       case _3DPRIM_LINELIST:
 478       case _3DPRIM_LINESTRIP:
 479       case _3DPRIM_LINELOOP:
 480          return true;
 481       }
 482    }
 483    return false;
 484 }
 485
 486 static inline bool
 487 use_state_point_size(const struct brw_context *brw)
 488 {
 489    const struct gl_context *ctx = &brw->ctx;
 490
 491    /* Section 14.4 (Points) of the OpenGL 4.5 specification says:
 492     *
 493     *    "If program point size mode is enabled, the derived point size is
 494     *     taken from the (potentially clipped) shader built-in gl_PointSize
 495     *     written by:
 496     *
 497     *        * the geometry shader, if active;
 498     *        * the tessellation evaluation shader, if active and no
 499     *          geometry shader is active;
 500     *        * the vertex shader, otherwise
 501     *
 502     *    and clamped to the implementation-dependent point size range.  If
 503     *    the value written to gl_PointSize is less than or equal to zero,
 504     *    or if no value was written to gl_PointSize, results are undefined.
 505     *    If program point size mode is disabled, the derived point size is
 506     *    specified with the command
 507     *
 508     *       void PointSize(float size);
 509     *
 510     *    size specifies the requested size of a point.  The default value
 511     *    is 1.0."
 512     *
 513     * The rules for GLES come from the ES 3.2, OES_geometry_point_size, and
 514     * OES_tessellation_point_size specifications.  To summarize: if the last
 515     * stage before rasterization is a GS or TES, then use gl_PointSize from
 516     * the shader if written.  Otherwise, use 1.0.  If the last stage is a
 517     * vertex shader, use gl_PointSize, or it is undefined.
 518     *
 519     * We can combine these rules into a single condition for both APIs.
 520     * Using the state point size when the last shader stage doesn't write
 521     * gl_PointSize satisfies GL's requirements, as it's undefined.  Because
 522     * ES doesn't have a PointSize() command, the state point size will
 523     * remain 1.0, satisfying the ES default value in the GS/TES case, and
 524     * the VS case (1.0 works for "undefined").  Mesa sets the program point
 525     * mode flag to always-enabled in ES, so we can safely check that, and
 526     * it'll be ignored for ES.
 527     *
 528     * _NEW_PROGRAM | _NEW_POINT
 529     * BRW_NEW_VUE_MAP_GEOM_OUT
 530     */
 531    return (!ctx->VertexProgram.PointSizeEnabled && !ctx->Point._Attenuated) ||
 532           (brw->vue_map_geom_out.slots_valid & VARYING_BIT_PSIZ) == 0;
 533 }
 534
 535
 536 #ifdef __cplusplus
 537 }
 538 #endif
 539
 540 #endif