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

   1 /*
   2  Copyright (C) Intel Corp.  2006.  All Rights Reserved.
   3  Intel funded Tungsten Graphics (http://www.tungstengraphics.com) 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 <keith@tungstengraphics.com>
  30   */
  31
  32
  33 #ifndef BRW_WM_H
  34 #define BRW_WM_H
  35
  36 #include <stdbool.h>
  37
  38 #include "program/prog_instruction.h"
  39 #include "brw_context.h"
  40 #include "brw_eu.h"
  41
  42 #define SATURATE (1<<5)
  43
  44 /* A big lookup table is used to figure out which and how many
  45  * additional regs will inserted before the main payload in the WM
  46  * program execution.  These mainly relate to depth and stencil
  47  * processing and the early-depth-test optimization.
  48  */
  49 #define IZ_PS_KILL_ALPHATEST_BIT    0x1
  50 #define IZ_PS_COMPUTES_DEPTH_BIT    0x2
  51 #define IZ_DEPTH_WRITE_ENABLE_BIT   0x4
  52 #define IZ_DEPTH_TEST_ENABLE_BIT    0x8
  53 #define IZ_STENCIL_WRITE_ENABLE_BIT 0x10
  54 #define IZ_STENCIL_TEST_ENABLE_BIT  0x20
  55 #define IZ_BIT_MAX                  0x40
  56
  57 #define AA_NEVER     0
  58 #define AA_SOMETIMES 1
  59 #define AA_ALWAYS    2
  60
  61 struct brw_wm_prog_key {
  62    GLuint stats_wm:1;
  63    GLuint flat_shade:1;
  64    GLuint linear_color:1;  /**< linear interpolation vs perspective interp */
  65    GLuint nr_color_regions:5;
  66    GLuint render_to_fbo:1;
  67
  68    GLbitfield proj_attrib_mask; /**< one bit per fragment program attribute */
  69    GLuint shadowtex_mask:16;
  70    GLuint yuvtex_mask:16;
  71    GLuint yuvtex_swap_mask:16;  /* UV swaped */
  72
  73    GLushort tex_swizzles[BRW_MAX_TEX_UNIT];
  74
  75    GLushort drawable_height;
  76    GLbitfield64 vp_outputs_written;
  77    GLuint iz_lookup;
  78    GLuint line_aa;
  79    GLuint program_string_id:32;
  80 };
  81
  82
  83 /* A bit of a glossary:
  84  *
  85  * brw_wm_value: A computed value or program input.  Values are
  86  * constant, they are created once and are never modified.  When a
  87  * fragment program register is written or overwritten, new values are
  88  * created fresh, preserving the rule that values are constant.
  89  *
  90  * brw_wm_ref: A reference to a value.  Wherever a value used is by an
  91  * instruction or as a program output, that is tracked with an
  92  * instance of this struct.  All references to a value occur after it
  93  * is created.  After the last reference, a value is dead and can be
  94  * discarded.
  95  *
  96  * brw_wm_grf: Represents a physical hardware register.  May be either
  97  * empty or hold a value.  Register allocation is the process of
  98  * assigning values to grf registers.  This occurs in pass2 and the
  99  * brw_wm_grf struct is not used before that.
 100  *
 101  * Fragment program registers: These are time-varying constructs that
 102  * are hard to reason about and which we translate away in pass0.  A
 103  * single fragment program register element (eg. temp[0].x) will be
 104  * translated to one or more brw_wm_value structs, one for each time
 105  * that temp[0].x is written to during the program.
 106  */
 107
 108
 109
 110 /* Used in pass2 to track register allocation.
 111  */
 112 struct brw_wm_grf {
 113    struct brw_wm_value *value;
 114    GLuint nextuse;
 115 };
 116
 117 struct brw_wm_value {
 118    struct brw_reg hw_reg;       /* emitted to this reg, may not always be there */
 119    struct brw_wm_ref *lastuse;
 120    struct brw_wm_grf *resident;
 121    GLuint contributes_to_output:1;
 122    GLuint spill_slot:16;        /* if non-zero, spill immediately after calculation */
 123 };
 124
 125 struct brw_wm_ref {
 126    struct brw_reg hw_reg;       /* nr filled in in pass2, everything else, pass0 */
 127    struct brw_wm_value *value;
 128    struct brw_wm_ref *prevuse;
 129    GLuint unspill_reg:7;        /* unspill to reg */
 130    GLuint emitted:1;
 131    GLuint insn:24;
 132 };
 133
 134 struct brw_wm_constref {
 135    const struct brw_wm_ref *ref;
 136    GLfloat constval;
 137 };
 138
 139
 140 struct brw_wm_instruction {
 141    struct brw_wm_value *dst[4];
 142    struct brw_wm_ref *src[3][4];
 143    GLuint opcode:8;
 144    GLuint saturate:1;
 145    GLuint writemask:4;
 146    GLuint tex_unit:4;   /* texture unit for TEX, TXD, TXP instructions */
 147    GLuint tex_idx:3;    /* TEXTURE_1D,2D,3D,CUBE,RECT_INDEX source target */
 148    GLuint tex_shadow:1; /* do shadow comparison? */
 149    GLuint eot:1;        /* End of thread indicator for FB_WRITE*/
 150    GLuint target:10;    /* target binding table index for FB_WRITE*/
 151 };
 152
 153
 154 #define BRW_WM_MAX_INSN  (MAX_PROGRAM_INSTRUCTIONS*3 + FRAG_ATTRIB_MAX + 3)
 155 #define BRW_WM_MAX_GRF   128            /* hardware limit */
 156 #define BRW_WM_MAX_VREG  (BRW_WM_MAX_INSN * 4)
 157 #define BRW_WM_MAX_REF   (BRW_WM_MAX_INSN * 12)
 158 #define BRW_WM_MAX_PARAM 256
 159 #define BRW_WM_MAX_CONST 256
 160 #define BRW_WM_MAX_SUBROUTINE 16
 161
 162 /* used in masks next to WRITEMASK_*. */
 163 #define SATURATE (1<<5)
 164
 165
 166 /* New opcodes to track internal operations required for WM unit.
 167  * These are added early so that the registers used can be tracked,
 168  * freed and reused like those of other instructions.
 169  */
 170 #define WM_PIXELXY        (MAX_OPCODE)
 171 #define WM_DELTAXY        (MAX_OPCODE + 1)
 172 #define WM_PIXELW         (MAX_OPCODE + 2)
 173 #define WM_LINTERP        (MAX_OPCODE + 3)
 174 #define WM_PINTERP        (MAX_OPCODE + 4)
 175 #define WM_CINTERP        (MAX_OPCODE + 5)
 176 #define WM_WPOSXY         (MAX_OPCODE + 6)
 177 #define WM_FB_WRITE       (MAX_OPCODE + 7)
 178 #define WM_FRONTFACING    (MAX_OPCODE + 8)
 179 #define MAX_WM_OPCODE     (MAX_OPCODE + 9)
 180
 181 #define PROGRAM_PAYLOAD   (PROGRAM_FILE_MAX)
 182 #define NUM_FILES         (PROGRAM_PAYLOAD + 1)
 183
 184 #define PAYLOAD_DEPTH     (FRAG_ATTRIB_MAX)
 185 #define PAYLOAD_W         (FRAG_ATTRIB_MAX + 1)
 186 #define PAYLOAD_FP_REG_MAX (FRAG_ATTRIB_MAX + 2)
 187
 188 struct brw_wm_compile {
 189    struct brw_compile func;
 190    struct brw_wm_prog_key key;
 191    struct brw_wm_prog_data prog_data;
 192
 193    struct brw_fragment_program *fp;
 194
 195    GLfloat (*env_param)[4];
 196
 197    enum {
 198       START,
 199       PASS2_DONE
 200    } state;
 201
 202    GLuint source_depth_reg:3;
 203    GLuint source_w_reg:3;
 204    GLuint aa_dest_stencil_reg:3;
 205    GLuint dest_depth_reg:3;
 206    GLuint nr_payload_regs:4;
 207    GLuint computes_depth:1;     /* could be derived from program string */
 208    GLuint source_depth_to_render_target:1;
 209    GLuint runtime_check_aads_emit:1;
 210
 211    /* Initial pass - translate fp instructions to fp instructions,
 212     * simplifying and adding instructions for interpolation and
 213     * framebuffer writes.
 214     */
 215    struct prog_instruction *prog_instructions;
 216    GLuint nr_fp_insns;
 217    GLuint fp_temp;
 218    GLuint fp_interp_emitted;
 219    GLuint fp_fragcolor_emitted;
 220
 221    struct prog_src_register pixel_xy;
 222    struct prog_src_register delta_xy;
 223    struct prog_src_register pixel_w;
 224
 225
 226    struct brw_wm_value *vreg;
 227    GLuint nr_vreg;
 228
 229    struct brw_wm_value creg[BRW_WM_MAX_PARAM];
 230    GLuint nr_creg;
 231
 232    struct {
 233       struct brw_wm_value depth[4]; /* includes r0/r1 */
 234       struct brw_wm_value input_interp[FRAG_ATTRIB_MAX];
 235    } payload;
 236
 237
 238    const struct brw_wm_ref *pass0_fp_reg[NUM_FILES][256][4];
 239
 240    struct brw_wm_ref undef_ref;
 241    struct brw_wm_value undef_value;
 242
 243    struct brw_wm_ref *refs;
 244    GLuint nr_refs;
 245
 246    struct brw_wm_instruction *instruction;
 247    GLuint nr_insns;
 248
 249    struct brw_wm_constref constref[BRW_WM_MAX_CONST];
 250    GLuint nr_constrefs;
 251
 252    struct brw_wm_grf pass2_grf[BRW_WM_MAX_GRF/2];
 253
 254    GLuint grf_limit;
 255    GLuint max_wm_grf;
 256    GLuint last_scratch;
 257
 258    GLuint cur_inst;  /**< index of current instruction */
 259
 260    GLboolean out_of_regs;  /**< ran out of GRF registers? */
 261
 262    /** Mapping from Mesa registers to hardware registers */
 263    struct {
 264       GLboolean inited;
 265       struct brw_reg reg;
 266    } wm_regs[NUM_FILES][256][4];
 267
 268    GLboolean used_grf[BRW_WM_MAX_GRF];
 269    GLuint first_free_grf;
 270    struct brw_reg stack;
 271    struct brw_reg emit_mask_reg;
 272    GLuint tmp_regs[BRW_WM_MAX_GRF];
 273    GLuint tmp_index;
 274    GLuint tmp_max;
 275    GLuint subroutines[BRW_WM_MAX_SUBROUTINE];
 276    GLuint dispatch_width;
 277
 278    /** we may need up to 3 constants per instruction (if use_const_buffer) */
 279    struct {
 280       GLint index;
 281       struct brw_reg reg;
 282    } current_const[3];
 283 };
 284
 285
 286 /** Bits for prog_instruction::Aux field */
 287 #define INST_AUX_EOT      0x1
 288 #define INST_AUX_TARGET(T)  (T << 1)
 289 #define INST_AUX_GET_TARGET(AUX) ((AUX) >> 1)
 290
 291
 292 GLuint brw_wm_nr_args( GLuint opcode );
 293 GLuint brw_wm_is_scalar_result( GLuint opcode );
 294
 295 void brw_wm_pass_fp( struct brw_wm_compile *c );
 296 void brw_wm_pass0( struct brw_wm_compile *c );
 297 void brw_wm_pass1( struct brw_wm_compile *c );
 298 void brw_wm_pass2( struct brw_wm_compile *c );
 299 void brw_wm_emit( struct brw_wm_compile *c );
 300 GLboolean brw_wm_arg_can_be_immediate(enum prog_opcode, int arg);
 301 void brw_wm_print_value( struct brw_wm_compile *c,
 302                          struct brw_wm_value *value );
 303
 304 void brw_wm_print_ref( struct brw_wm_compile *c,
 305                        struct brw_wm_ref *ref );
 306
 307 void brw_wm_print_insn( struct brw_wm_compile *c,
 308                         struct brw_wm_instruction *inst );
 309
 310 void brw_wm_print_program( struct brw_wm_compile *c,
 311                            const char *stage );
 312
 313 void brw_wm_lookup_iz(struct intel_context *intel,
 314                       struct brw_wm_compile *c);
 315
 316 GLboolean brw_wm_fs_emit(struct brw_context *brw, struct brw_wm_compile *c);
 317
 318 /* brw_wm_emit.c */
 319 void emit_alu1(struct brw_compile *p,
 320                struct brw_instruction *(*func)(struct brw_compile *,
 321                                                struct brw_reg,
 322                                                struct brw_reg),
 323                const struct brw_reg *dst,
 324                GLuint mask,
 325                const struct brw_reg *arg0);
 326 void emit_alu2(struct brw_compile *p,
 327                struct brw_instruction *(*func)(struct brw_compile *,
 328                                                struct brw_reg,
 329                                                struct brw_reg,
 330                                                struct brw_reg),
 331                const struct brw_reg *dst,
 332                GLuint mask,
 333                const struct brw_reg *arg0,
 334                const struct brw_reg *arg1);
 335 void emit_cinterp(struct brw_compile *p,
 336                   const struct brw_reg *dst,
 337                   GLuint mask,
 338                   const struct brw_reg *arg0);
 339 void emit_cmp(struct brw_compile *p,
 340               const struct brw_reg *dst,
 341               GLuint mask,
 342               const struct brw_reg *arg0,
 343               const struct brw_reg *arg1,
 344               const struct brw_reg *arg2);
 345 void emit_ddxy(struct brw_compile *p,
 346                const struct brw_reg *dst,
 347                GLuint mask,
 348                GLboolean is_ddx,
 349                const struct brw_reg *arg0);
 350 void emit_delta_xy(struct brw_compile *p,
 351                    const struct brw_reg *dst,
 352                    GLuint mask,
 353                    const struct brw_reg *arg0);
 354 void emit_dp2(struct brw_compile *p,
 355               const struct brw_reg *dst,
 356               GLuint mask,
 357               const struct brw_reg *arg0,
 358               const struct brw_reg *arg1);
 359 void emit_dp3(struct brw_compile *p,
 360               const struct brw_reg *dst,
 361               GLuint mask,
 362               const struct brw_reg *arg0,
 363               const struct brw_reg *arg1);
 364 void emit_dp4(struct brw_compile *p,
 365               const struct brw_reg *dst,
 366               GLuint mask,
 367               const struct brw_reg *arg0,
 368               const struct brw_reg *arg1);
 369 void emit_dph(struct brw_compile *p,
 370               const struct brw_reg *dst,
 371               GLuint mask,
 372               const struct brw_reg *arg0,
 373               const struct brw_reg *arg1);
 374 void emit_fb_write(struct brw_wm_compile *c,
 375                    struct brw_reg *arg0,
 376                    struct brw_reg *arg1,
 377                    struct brw_reg *arg2,
 378                    GLuint target,
 379                    GLuint eot);
 380 void emit_frontfacing(struct brw_compile *p,
 381                       const struct brw_reg *dst,
 382                       GLuint mask);
 383 void emit_linterp(struct brw_compile *p,
 384                   const struct brw_reg *dst,
 385                   GLuint mask,
 386                   const struct brw_reg *arg0,
 387                   const struct brw_reg *deltas);
 388 void emit_lrp(struct brw_compile *p,
 389               const struct brw_reg *dst,
 390               GLuint mask,
 391               const struct brw_reg *arg0,
 392               const struct brw_reg *arg1,
 393               const struct brw_reg *arg2);
 394 void emit_mad(struct brw_compile *p,
 395               const struct brw_reg *dst,
 396               GLuint mask,
 397               const struct brw_reg *arg0,
 398               const struct brw_reg *arg1,
 399               const struct brw_reg *arg2);
 400 void emit_math1(struct brw_wm_compile *c,
 401                 GLuint function,
 402                 const struct brw_reg *dst,
 403                 GLuint mask,
 404                 const struct brw_reg *arg0);
 405 void emit_math2(struct brw_wm_compile *c,
 406                 GLuint function,
 407                 const struct brw_reg *dst,
 408                 GLuint mask,
 409                 const struct brw_reg *arg0,
 410                 const struct brw_reg *arg1);
 411 void emit_min(struct brw_compile *p,
 412               const struct brw_reg *dst,
 413               GLuint mask,
 414               const struct brw_reg *arg0,
 415               const struct brw_reg *arg1);
 416 void emit_max(struct brw_compile *p,
 417               const struct brw_reg *dst,
 418               GLuint mask,
 419               const struct brw_reg *arg0,
 420               const struct brw_reg *arg1);
 421 void emit_pinterp(struct brw_compile *p,
 422                   const struct brw_reg *dst,
 423                   GLuint mask,
 424                   const struct brw_reg *arg0,
 425                   const struct brw_reg *deltas,
 426                   const struct brw_reg *w);
 427 void emit_pixel_xy(struct brw_wm_compile *c,
 428                    const struct brw_reg *dst,
 429                    GLuint mask);
 430 void emit_pixel_w(struct brw_wm_compile *c,
 431                   const struct brw_reg *dst,
 432                   GLuint mask,
 433                   const struct brw_reg *arg0,
 434                   const struct brw_reg *deltas);
 435 void emit_sop(struct brw_compile *p,
 436               const struct brw_reg *dst,
 437               GLuint mask,
 438               GLuint cond,
 439               const struct brw_reg *arg0,
 440               const struct brw_reg *arg1);
 441 void emit_sign(struct brw_compile *p,
 442                const struct brw_reg *dst,
 443                GLuint mask,
 444                const struct brw_reg *arg0);
 445 void emit_tex(struct brw_wm_compile *c,
 446               struct brw_reg *dst,
 447               GLuint dst_flags,
 448               struct brw_reg *arg,
 449               struct brw_reg depth_payload,
 450               GLuint tex_idx,
 451               GLuint sampler,
 452               GLboolean shadow);
 453 void emit_txb(struct brw_wm_compile *c,
 454               struct brw_reg *dst,
 455               GLuint dst_flags,
 456               struct brw_reg *arg,
 457               struct brw_reg depth_payload,
 458               GLuint tex_idx,
 459               GLuint sampler);
 460 void emit_wpos_xy(struct brw_wm_compile *c,
 461                   const struct brw_reg *dst,
 462                   GLuint mask,
 463                   const struct brw_reg *arg0);
 464 void emit_xpd(struct brw_compile *p,
 465               const struct brw_reg *dst,
 466               GLuint mask,
 467               const struct brw_reg *arg0,
 468               const struct brw_reg *arg1);
 469
 470 GLboolean brw_compile_shader(struct gl_context *ctx,
 471                              struct gl_shader *shader);
 472 GLboolean brw_link_shader(struct gl_context *ctx, struct gl_shader_program *prog);
 473 struct gl_shader *brw_new_shader(struct gl_context *ctx, GLuint name, GLuint type);
 474 struct gl_shader_program *brw_new_shader_program(struct gl_context *ctx, GLuint name);
 475
 476 bool brw_color_buffer_write_enabled(struct brw_context *brw);
 477 bool brw_render_target_supported(gl_format format);
 478
 479 #endif