src/glsl/nir/shader_enums.h

   1 /*
   2  * Mesa 3-D graphics library
   3  *
   4  * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.
   5  * Copyright (C) 2009  VMware, Inc.  All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included
  15  * in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  21  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  22  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  23  * OTHER DEALINGS IN THE SOFTWARE.
  24  */
  25
  26 #ifndef SHADER_ENUMS_H
  27 #define SHADER_ENUMS_H
  28
  29 /**
  30  * Shader stages. Note that these will become 5 with tessellation.
  31  *
  32  * The order must match how shaders are ordered in the pipeline.
  33  * The GLSL linker assumes that if i<j, then the j-th shader is
  34  * executed later than the i-th shader.
  35  */
  36 typedef enum
  37 {
  38    MESA_SHADER_VERTEX = 0,
  39    MESA_SHADER_TESS_CTRL = 1,
  40    MESA_SHADER_TESS_EVAL = 2,
  41    MESA_SHADER_GEOMETRY = 3,
  42    MESA_SHADER_FRAGMENT = 4,
  43    MESA_SHADER_COMPUTE = 5,
  44 } gl_shader_stage;
  45
  46 const char * gl_shader_stage_name(gl_shader_stage stage);
  47
  48 #define MESA_SHADER_STAGES (MESA_SHADER_COMPUTE + 1)
  49
  50
  51 /**
  52  * Indexes for vertex program attributes.
  53  * GL_NV_vertex_program aliases generic attributes over the conventional
  54  * attributes.  In GL_ARB_vertex_program shader the aliasing is optional.
  55  * In GL_ARB_vertex_shader / OpenGL 2.0 the aliasing is disallowed (the
  56  * generic attributes are distinct/separate).
  57  */
  58 typedef enum
  59 {
  60    VERT_ATTRIB_POS = 0,
  61    VERT_ATTRIB_WEIGHT = 1,
  62    VERT_ATTRIB_NORMAL = 2,
  63    VERT_ATTRIB_COLOR0 = 3,
  64    VERT_ATTRIB_COLOR1 = 4,
  65    VERT_ATTRIB_FOG = 5,
  66    VERT_ATTRIB_COLOR_INDEX = 6,
  67    VERT_ATTRIB_EDGEFLAG = 7,
  68    VERT_ATTRIB_TEX0 = 8,
  69    VERT_ATTRIB_TEX1 = 9,
  70    VERT_ATTRIB_TEX2 = 10,
  71    VERT_ATTRIB_TEX3 = 11,
  72    VERT_ATTRIB_TEX4 = 12,
  73    VERT_ATTRIB_TEX5 = 13,
  74    VERT_ATTRIB_TEX6 = 14,
  75    VERT_ATTRIB_TEX7 = 15,
  76    VERT_ATTRIB_POINT_SIZE = 16,
  77    VERT_ATTRIB_GENERIC0 = 17,
  78    VERT_ATTRIB_GENERIC1 = 18,
  79    VERT_ATTRIB_GENERIC2 = 19,
  80    VERT_ATTRIB_GENERIC3 = 20,
  81    VERT_ATTRIB_GENERIC4 = 21,
  82    VERT_ATTRIB_GENERIC5 = 22,
  83    VERT_ATTRIB_GENERIC6 = 23,
  84    VERT_ATTRIB_GENERIC7 = 24,
  85    VERT_ATTRIB_GENERIC8 = 25,
  86    VERT_ATTRIB_GENERIC9 = 26,
  87    VERT_ATTRIB_GENERIC10 = 27,
  88    VERT_ATTRIB_GENERIC11 = 28,
  89    VERT_ATTRIB_GENERIC12 = 29,
  90    VERT_ATTRIB_GENERIC13 = 30,
  91    VERT_ATTRIB_GENERIC14 = 31,
  92    VERT_ATTRIB_GENERIC15 = 32,
  93    VERT_ATTRIB_MAX = 33
  94 } gl_vert_attrib;
  95
  96 const char * gl_vert_attrib_name(gl_vert_attrib attrib);
  97
  98 /**
  99  * Symbolic constats to help iterating over
 100  * specific blocks of vertex attributes.
 101  *
 102  * VERT_ATTRIB_FF
 103  *   includes all fixed function attributes as well as
 104  *   the aliased GL_NV_vertex_program shader attributes.
 105  * VERT_ATTRIB_TEX
 106  *   include the classic texture coordinate attributes.
 107  *   Is a subset of VERT_ATTRIB_FF.
 108  * VERT_ATTRIB_GENERIC
 109  *   include the OpenGL 2.0+ GLSL generic shader attributes.
 110  *   These alias the generic GL_ARB_vertex_shader attributes.
 111  */
 112 #define VERT_ATTRIB_FF(i)           (VERT_ATTRIB_POS + (i))
 113 #define VERT_ATTRIB_FF_MAX          VERT_ATTRIB_GENERIC0
 114
 115 #define VERT_ATTRIB_TEX(i)          (VERT_ATTRIB_TEX0 + (i))
 116 #define VERT_ATTRIB_TEX_MAX         MAX_TEXTURE_COORD_UNITS
 117
 118 #define VERT_ATTRIB_GENERIC(i)      (VERT_ATTRIB_GENERIC0 + (i))
 119 #define VERT_ATTRIB_GENERIC_MAX     MAX_VERTEX_GENERIC_ATTRIBS
 120
 121 /**
 122  * Bitflags for vertex attributes.
 123  * These are used in bitfields in many places.
 124  */
 125 /*@{*/
 126 #define VERT_BIT_POS             BITFIELD64_BIT(VERT_ATTRIB_POS)
 127 #define VERT_BIT_WEIGHT          BITFIELD64_BIT(VERT_ATTRIB_WEIGHT)
 128 #define VERT_BIT_NORMAL          BITFIELD64_BIT(VERT_ATTRIB_NORMAL)
 129 #define VERT_BIT_COLOR0          BITFIELD64_BIT(VERT_ATTRIB_COLOR0)
 130 #define VERT_BIT_COLOR1          BITFIELD64_BIT(VERT_ATTRIB_COLOR1)
 131 #define VERT_BIT_FOG             BITFIELD64_BIT(VERT_ATTRIB_FOG)
 132 #define VERT_BIT_COLOR_INDEX     BITFIELD64_BIT(VERT_ATTRIB_COLOR_INDEX)
 133 #define VERT_BIT_EDGEFLAG        BITFIELD64_BIT(VERT_ATTRIB_EDGEFLAG)
 134 #define VERT_BIT_TEX0            BITFIELD64_BIT(VERT_ATTRIB_TEX0)
 135 #define VERT_BIT_TEX1            BITFIELD64_BIT(VERT_ATTRIB_TEX1)
 136 #define VERT_BIT_TEX2            BITFIELD64_BIT(VERT_ATTRIB_TEX2)
 137 #define VERT_BIT_TEX3            BITFIELD64_BIT(VERT_ATTRIB_TEX3)
 138 #define VERT_BIT_TEX4            BITFIELD64_BIT(VERT_ATTRIB_TEX4)
 139 #define VERT_BIT_TEX5            BITFIELD64_BIT(VERT_ATTRIB_TEX5)
 140 #define VERT_BIT_TEX6            BITFIELD64_BIT(VERT_ATTRIB_TEX6)
 141 #define VERT_BIT_TEX7            BITFIELD64_BIT(VERT_ATTRIB_TEX7)
 142 #define VERT_BIT_POINT_SIZE      BITFIELD64_BIT(VERT_ATTRIB_POINT_SIZE)
 143 #define VERT_BIT_GENERIC0        BITFIELD64_BIT(VERT_ATTRIB_GENERIC0)
 144
 145 #define VERT_BIT(i)              BITFIELD64_BIT(i)
 146 #define VERT_BIT_ALL             BITFIELD64_RANGE(0, VERT_ATTRIB_MAX)
 147
 148 #define VERT_BIT_FF(i)           VERT_BIT(i)
 149 #define VERT_BIT_FF_ALL          BITFIELD64_RANGE(0, VERT_ATTRIB_FF_MAX)
 150 #define VERT_BIT_TEX(i)          VERT_BIT(VERT_ATTRIB_TEX(i))
 151 #define VERT_BIT_TEX_ALL         \
 152    BITFIELD64_RANGE(VERT_ATTRIB_TEX(0), VERT_ATTRIB_TEX_MAX)
 153
 154 #define VERT_BIT_GENERIC(i)      VERT_BIT(VERT_ATTRIB_GENERIC(i))
 155 #define VERT_BIT_GENERIC_ALL     \
 156    BITFIELD64_RANGE(VERT_ATTRIB_GENERIC(0), VERT_ATTRIB_GENERIC_MAX)
 157 /*@}*/
 158
 159
 160 /**
 161  * Indexes for vertex shader outputs, geometry shader inputs/outputs, and
 162  * fragment shader inputs.
 163  *
 164  * Note that some of these values are not available to all pipeline stages.
 165  *
 166  * When this enum is updated, the following code must be updated too:
 167  * - vertResults (in prog_print.c's arb_output_attrib_string())
 168  * - fragAttribs (in prog_print.c's arb_input_attrib_string())
 169  * - _mesa_varying_slot_in_fs()
 170  */
 171 typedef enum
 172 {
 173    VARYING_SLOT_POS,
 174    VARYING_SLOT_COL0, /* COL0 and COL1 must be contiguous */
 175    VARYING_SLOT_COL1,
 176    VARYING_SLOT_FOGC,
 177    VARYING_SLOT_TEX0, /* TEX0-TEX7 must be contiguous */
 178    VARYING_SLOT_TEX1,
 179    VARYING_SLOT_TEX2,
 180    VARYING_SLOT_TEX3,
 181    VARYING_SLOT_TEX4,
 182    VARYING_SLOT_TEX5,
 183    VARYING_SLOT_TEX6,
 184    VARYING_SLOT_TEX7,
 185    VARYING_SLOT_PSIZ, /* Does not appear in FS */
 186    VARYING_SLOT_BFC0, /* Does not appear in FS */
 187    VARYING_SLOT_BFC1, /* Does not appear in FS */
 188    VARYING_SLOT_EDGE, /* Does not appear in FS */
 189    VARYING_SLOT_CLIP_VERTEX, /* Does not appear in FS */
 190    VARYING_SLOT_CLIP_DIST0,
 191    VARYING_SLOT_CLIP_DIST1,
 192    VARYING_SLOT_PRIMITIVE_ID, /* Does not appear in VS */
 193    VARYING_SLOT_LAYER, /* Appears as VS or GS output */
 194    VARYING_SLOT_VIEWPORT, /* Appears as VS or GS output */
 195    VARYING_SLOT_FACE, /* FS only */
 196    VARYING_SLOT_PNTC, /* FS only */
 197    VARYING_SLOT_TESS_LEVEL_OUTER, /* Only appears as TCS output. */
 198    VARYING_SLOT_TESS_LEVEL_INNER, /* Only appears as TCS output. */
 199    VARYING_SLOT_VAR0, /* First generic varying slot */
 200    /* the remaining are simply for the benefit of gl_varying_slot_name()
 201     * and not to be construed as an upper bound:
 202     */
 203    VARYING_SLOT_VAR1,
 204    VARYING_SLOT_VAR2,
 205    VARYING_SLOT_VAR3,
 206    VARYING_SLOT_VAR4,
 207    VARYING_SLOT_VAR5,
 208    VARYING_SLOT_VAR6,
 209    VARYING_SLOT_VAR7,
 210    VARYING_SLOT_VAR8,
 211    VARYING_SLOT_VAR9,
 212    VARYING_SLOT_VAR10,
 213    VARYING_SLOT_VAR11,
 214    VARYING_SLOT_VAR12,
 215    VARYING_SLOT_VAR13,
 216    VARYING_SLOT_VAR14,
 217    VARYING_SLOT_VAR15,
 218    VARYING_SLOT_VAR16,
 219    VARYING_SLOT_VAR17,
 220    VARYING_SLOT_VAR18,
 221    VARYING_SLOT_VAR19,
 222    VARYING_SLOT_VAR20,
 223    VARYING_SLOT_VAR21,
 224    VARYING_SLOT_VAR22,
 225    VARYING_SLOT_VAR23,
 226    VARYING_SLOT_VAR24,
 227    VARYING_SLOT_VAR25,
 228    VARYING_SLOT_VAR26,
 229    VARYING_SLOT_VAR27,
 230    VARYING_SLOT_VAR28,
 231    VARYING_SLOT_VAR29,
 232    VARYING_SLOT_VAR30,
 233    VARYING_SLOT_VAR31,
 234 } gl_varying_slot;
 235
 236
 237 #define VARYING_SLOT_MAX        (VARYING_SLOT_VAR0 + MAX_VARYING)
 238 #define VARYING_SLOT_PATCH0     (VARYING_SLOT_MAX)
 239 #define VARYING_SLOT_TESS_MAX   (VARYING_SLOT_PATCH0 + MAX_VARYING)
 240
 241 const char * gl_varying_slot_name(gl_varying_slot slot);
 242
 243 /**
 244  * Bitflags for varying slots.
 245  */
 246 /*@{*/
 247 #define VARYING_BIT_POS BITFIELD64_BIT(VARYING_SLOT_POS)
 248 #define VARYING_BIT_COL0 BITFIELD64_BIT(VARYING_SLOT_COL0)
 249 #define VARYING_BIT_COL1 BITFIELD64_BIT(VARYING_SLOT_COL1)
 250 #define VARYING_BIT_FOGC BITFIELD64_BIT(VARYING_SLOT_FOGC)
 251 #define VARYING_BIT_TEX0 BITFIELD64_BIT(VARYING_SLOT_TEX0)
 252 #define VARYING_BIT_TEX1 BITFIELD64_BIT(VARYING_SLOT_TEX1)
 253 #define VARYING_BIT_TEX2 BITFIELD64_BIT(VARYING_SLOT_TEX2)
 254 #define VARYING_BIT_TEX3 BITFIELD64_BIT(VARYING_SLOT_TEX3)
 255 #define VARYING_BIT_TEX4 BITFIELD64_BIT(VARYING_SLOT_TEX4)
 256 #define VARYING_BIT_TEX5 BITFIELD64_BIT(VARYING_SLOT_TEX5)
 257 #define VARYING_BIT_TEX6 BITFIELD64_BIT(VARYING_SLOT_TEX6)
 258 #define VARYING_BIT_TEX7 BITFIELD64_BIT(VARYING_SLOT_TEX7)
 259 #define VARYING_BIT_TEX(U) BITFIELD64_BIT(VARYING_SLOT_TEX0 + (U))
 260 #define VARYING_BITS_TEX_ANY BITFIELD64_RANGE(VARYING_SLOT_TEX0, \
 261                                               MAX_TEXTURE_COORD_UNITS)
 262 #define VARYING_BIT_PSIZ BITFIELD64_BIT(VARYING_SLOT_PSIZ)
 263 #define VARYING_BIT_BFC0 BITFIELD64_BIT(VARYING_SLOT_BFC0)
 264 #define VARYING_BIT_BFC1 BITFIELD64_BIT(VARYING_SLOT_BFC1)
 265 #define VARYING_BIT_EDGE BITFIELD64_BIT(VARYING_SLOT_EDGE)
 266 #define VARYING_BIT_CLIP_VERTEX BITFIELD64_BIT(VARYING_SLOT_CLIP_VERTEX)
 267 #define VARYING_BIT_CLIP_DIST0 BITFIELD64_BIT(VARYING_SLOT_CLIP_DIST0)
 268 #define VARYING_BIT_CLIP_DIST1 BITFIELD64_BIT(VARYING_SLOT_CLIP_DIST1)
 269 #define VARYING_BIT_PRIMITIVE_ID BITFIELD64_BIT(VARYING_SLOT_PRIMITIVE_ID)
 270 #define VARYING_BIT_LAYER BITFIELD64_BIT(VARYING_SLOT_LAYER)
 271 #define VARYING_BIT_VIEWPORT BITFIELD64_BIT(VARYING_SLOT_VIEWPORT)
 272 #define VARYING_BIT_FACE BITFIELD64_BIT(VARYING_SLOT_FACE)
 273 #define VARYING_BIT_PNTC BITFIELD64_BIT(VARYING_SLOT_PNTC)
 274 #define VARYING_BIT_TESS_LEVEL_OUTER BITFIELD64_BIT(VARYING_SLOT_TESS_LEVEL_OUTER)
 275 #define VARYING_BIT_TESS_LEVEL_INNER BITFIELD64_BIT(VARYING_SLOT_TESS_LEVEL_INNER)
 276 #define VARYING_BIT_VAR(V) BITFIELD64_BIT(VARYING_SLOT_VAR0 + (V))
 277 /*@}*/
 278
 279 /**
 280  * Bitflags for system values.
 281  */
 282 #define SYSTEM_BIT_SAMPLE_ID ((uint64_t)1 << SYSTEM_VALUE_SAMPLE_ID)
 283 #define SYSTEM_BIT_SAMPLE_POS ((uint64_t)1 << SYSTEM_VALUE_SAMPLE_POS)
 284 #define SYSTEM_BIT_SAMPLE_MASK_IN ((uint64_t)1 << SYSTEM_VALUE_SAMPLE_MASK_IN)
 285 #define SYSTEM_BIT_LOCAL_INVOCATION_ID ((uint64_t)1 << SYSTEM_VALUE_LOCAL_INVOCATION_ID)
 286
 287 /**
 288  * If the gl_register_file is PROGRAM_SYSTEM_VALUE, the register index will be
 289  * one of these values.  If a NIR variable's mode is nir_var_system_value, it
 290  * will be one of these values.
 291  */
 292 typedef enum
 293 {
 294    /**
 295     * \name Vertex shader system values
 296     */
 297    /*@{*/
 298    /**
 299     * OpenGL-style vertex ID.
 300     *
 301     * Section 2.11.7 (Shader Execution), subsection Shader Inputs, of the
 302     * OpenGL 3.3 core profile spec says:
 303     *
 304     *     "gl_VertexID holds the integer index i implicitly passed by
 305     *     DrawArrays or one of the other drawing commands defined in section
 306     *     2.8.3."
 307     *
 308     * Section 2.8.3 (Drawing Commands) of the same spec says:
 309     *
 310     *     "The commands....are equivalent to the commands with the same base
 311     *     name (without the BaseVertex suffix), except that the ith element
 312     *     transferred by the corresponding draw call will be taken from
 313     *     element indices[i] + basevertex of each enabled array."
 314     *
 315     * Additionally, the overview in the GL_ARB_shader_draw_parameters spec
 316     * says:
 317     *
 318     *     "In unextended GL, vertex shaders have inputs named gl_VertexID and
 319     *     gl_InstanceID, which contain, respectively the index of the vertex
 320     *     and instance. The value of gl_VertexID is the implicitly passed
 321     *     index of the vertex being processed, which includes the value of
 322     *     baseVertex, for those commands that accept it."
 323     *
 324     * gl_VertexID gets basevertex added in.  This differs from DirectX where
 325     * SV_VertexID does \b not get basevertex added in.
 326     *
 327     * \note
 328     * If all system values are available, \c SYSTEM_VALUE_VERTEX_ID will be
 329     * equal to \c SYSTEM_VALUE_VERTEX_ID_ZERO_BASE plus
 330     * \c SYSTEM_VALUE_BASE_VERTEX.
 331     *
 332     * \sa SYSTEM_VALUE_VERTEX_ID_ZERO_BASE, SYSTEM_VALUE_BASE_VERTEX
 333     */
 334    SYSTEM_VALUE_VERTEX_ID,
 335
 336    /**
 337     * Instanced ID as supplied to gl_InstanceID
 338     *
 339     * Values assigned to gl_InstanceID always begin with zero, regardless of
 340     * the value of baseinstance.
 341     *
 342     * Section 11.1.3.9 (Shader Inputs) of the OpenGL 4.4 core profile spec
 343     * says:
 344     *
 345     *     "gl_InstanceID holds the integer instance number of the current
 346     *     primitive in an instanced draw call (see section 10.5)."
 347     *
 348     * Through a big chain of pseudocode, section 10.5 describes that
 349     * baseinstance is not counted by gl_InstanceID.  In that section, notice
 350     *
 351     *     "If an enabled vertex attribute array is instanced (it has a
 352     *     non-zero divisor as specified by VertexAttribDivisor), the element
 353     *     index that is transferred to the GL, for all vertices, is given by
 354     *
 355     *         floor(instance/divisor) + baseinstance
 356     *
 357     *     If an array corresponding to an attribute required by a vertex
 358     *     shader is not enabled, then the corresponding element is taken from
 359     *     the current attribute state (see section 10.2)."
 360     *
 361     * Note that baseinstance is \b not included in the value of instance.
 362     */
 363    SYSTEM_VALUE_INSTANCE_ID,
 364
 365    /**
 366     * DirectX-style vertex ID.
 367     *
 368     * Unlike \c SYSTEM_VALUE_VERTEX_ID, this system value does \b not include
 369     * the value of basevertex.
 370     *
 371     * \sa SYSTEM_VALUE_VERTEX_ID, SYSTEM_VALUE_BASE_VERTEX
 372     */
 373    SYSTEM_VALUE_VERTEX_ID_ZERO_BASE,
 374
 375    /**
 376     * Value of \c basevertex passed to \c glDrawElementsBaseVertex and similar
 377     * functions.
 378     *
 379     * \sa SYSTEM_VALUE_VERTEX_ID, SYSTEM_VALUE_VERTEX_ID_ZERO_BASE
 380     */
 381    SYSTEM_VALUE_BASE_VERTEX,
 382    /*@}*/
 383
 384    /**
 385     * \name Geometry shader system values
 386     */
 387    /*@{*/
 388    SYSTEM_VALUE_INVOCATION_ID,  /**< (Also in Tessellation Control shader) */
 389    /*@}*/
 390
 391    /**
 392     * \name Fragment shader system values
 393     */
 394    /*@{*/
 395    SYSTEM_VALUE_FRONT_FACE,     /**< (not done yet) */
 396    SYSTEM_VALUE_SAMPLE_ID,
 397    SYSTEM_VALUE_SAMPLE_POS,
 398    SYSTEM_VALUE_SAMPLE_MASK_IN,
 399    /*@}*/
 400
 401    /**
 402     * \name Tessellation Evaluation shader system values
 403     */
 404    /*@{*/
 405    SYSTEM_VALUE_TESS_COORD,
 406    SYSTEM_VALUE_VERTICES_IN,    /**< Tessellation vertices in input patch */
 407    SYSTEM_VALUE_PRIMITIVE_ID,
 408    SYSTEM_VALUE_TESS_LEVEL_OUTER, /**< TES input */
 409    SYSTEM_VALUE_TESS_LEVEL_INNER, /**< TES input */
 410    /*@}*/
 411
 412    /**
 413     * \name Compute shader system values
 414     */
 415    /*@{*/
 416    SYSTEM_VALUE_LOCAL_INVOCATION_ID,
 417    SYSTEM_VALUE_WORK_GROUP_ID,
 418    SYSTEM_VALUE_NUM_WORK_GROUPS,
 419    /*@}*/
 420
 421    /**
 422     * Driver internal vertex-count, used (for example) for drivers to
 423     * calculate stride for stream-out outputs.  Not externally visible.
 424     */
 425    SYSTEM_VALUE_VERTEX_CNT,
 426
 427    SYSTEM_VALUE_MAX             /**< Number of values */
 428 } gl_system_value;
 429
 430 const char * gl_system_value_name(gl_system_value sysval);
 431
 432 /**
 433  * The possible interpolation qualifiers that can be applied to a fragment
 434  * shader input in GLSL.
 435  *
 436  * Note: INTERP_QUALIFIER_NONE must be 0 so that memsetting the
 437  * gl_fragment_program data structure to 0 causes the default behavior.
 438  */
 439 enum glsl_interp_qualifier
 440 {
 441    INTERP_QUALIFIER_NONE = 0,
 442    INTERP_QUALIFIER_SMOOTH,
 443    INTERP_QUALIFIER_FLAT,
 444    INTERP_QUALIFIER_NOPERSPECTIVE,
 445    INTERP_QUALIFIER_COUNT /**< Number of interpolation qualifiers */
 446 };
 447
 448 const char * glsl_interp_qualifier_name(enum glsl_interp_qualifier qual);
 449
 450 /**
 451  * Fragment program results
 452  */
 453 typedef enum
 454 {
 455    FRAG_RESULT_DEPTH = 0,
 456    FRAG_RESULT_STENCIL = 1,
 457    /* If a single color should be written to all render targets, this
 458     * register is written.  No FRAG_RESULT_DATAn will be written.
 459     */
 460    FRAG_RESULT_COLOR = 2,
 461    FRAG_RESULT_SAMPLE_MASK = 3,
 462
 463    /* FRAG_RESULT_DATAn are the per-render-target (GLSL gl_FragData[n]
 464     * or ARB_fragment_program fragment.color[n]) color results.  If
 465     * any are written, FRAG_RESULT_COLOR will not be written.
 466     * FRAG_RESULT_DATA1 and up are simply for the benefit of
 467     * gl_frag_result_name() and not to be construed as an upper bound
 468     */
 469    FRAG_RESULT_DATA0 = 4,
 470    FRAG_RESULT_DATA1,
 471    FRAG_RESULT_DATA2,
 472    FRAG_RESULT_DATA3,
 473    FRAG_RESULT_DATA4,
 474    FRAG_RESULT_DATA5,
 475    FRAG_RESULT_DATA6,
 476    FRAG_RESULT_DATA7,
 477 } gl_frag_result;
 478
 479 const char * gl_frag_result_name(gl_frag_result result);
 480
 481 #define FRAG_RESULT_MAX         (FRAG_RESULT_DATA0 + MAX_DRAW_BUFFERS)
 482
 483 /**
 484  * \brief Layout qualifiers for gl_FragDepth.
 485  *
 486  * Extension AMD_conservative_depth allows gl_FragDepth to be redeclared with
 487  * a layout qualifier.
 488  *
 489  * \see enum ir_depth_layout
 490  */
 491 enum gl_frag_depth_layout
 492 {
 493    FRAG_DEPTH_LAYOUT_NONE, /**< No layout is specified. */
 494    FRAG_DEPTH_LAYOUT_ANY,
 495    FRAG_DEPTH_LAYOUT_GREATER,
 496    FRAG_DEPTH_LAYOUT_LESS,
 497    FRAG_DEPTH_LAYOUT_UNCHANGED
 498 };
 499
 500 #endif /* SHADER_ENUMS_H */