src/gallium/include/pipe/p_state.h

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * 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, sub license, 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 portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28
  29 /**
  30  * @file
  31  *
  32  * Abstract graphics pipe state objects.
  33  *
  34  * Basic notes:
  35  *   1. Want compact representations, so we use bitfields.
  36  *   2. Put bitfields before other (GLfloat) fields.
  37  */
  38
  39
  40 #ifndef PIPE_STATE_H
  41 #define PIPE_STATE_H
  42
  43 #include "p_compiler.h"
  44 #include "p_defines.h"
  45 #include "p_format.h"
  46
  47
  48 #ifdef __cplusplus
  49 extern "C" {
  50 #endif
  51
  52
  53 /**
  54  * Implementation limits
  55  */
  56 #define PIPE_MAX_ATTRIBS          32
  57 #define PIPE_MAX_CLIP_PLANES       8
  58 #define PIPE_MAX_COLOR_BUFS        8
  59 #define PIPE_MAX_CONSTANT_BUFFERS 32
  60 #define PIPE_MAX_SAMPLERS         16
  61 #define PIPE_MAX_VERTEX_SAMPLERS  16
  62 #define PIPE_MAX_GEOMETRY_SAMPLERS  16
  63 #define PIPE_MAX_SHADER_INPUTS    32
  64 #define PIPE_MAX_SHADER_OUTPUTS   32
  65 #define PIPE_MAX_SHADER_SAMPLER_VIEWS 32
  66 #define PIPE_MAX_SHADER_RESOURCES 32
  67 #define PIPE_MAX_TEXTURE_LEVELS   16
  68 #define PIPE_MAX_SO_BUFFERS        4
  69
  70
  71 struct pipe_reference
  72 {
  73    int32_t count; /* atomic */
  74 };
  75
  76
  77
  78 /**
  79  * Primitive (point/line/tri) rasterization info
  80  */
  81 struct pipe_rasterizer_state
  82 {
  83    unsigned flatshade:1;
  84    unsigned light_twoside:1;
  85    unsigned clamp_vertex_color:1;
  86    unsigned clamp_fragment_color:1;
  87    unsigned front_ccw:1;
  88    unsigned cull_face:2;      /**< PIPE_FACE_x */
  89    unsigned fill_front:2;     /**< PIPE_POLYGON_MODE_x */
  90    unsigned fill_back:2;      /**< PIPE_POLYGON_MODE_x */
  91    unsigned offset_point:1;
  92    unsigned offset_line:1;
  93    unsigned offset_tri:1;
  94    unsigned scissor:1;
  95    unsigned poly_smooth:1;
  96    unsigned poly_stipple_enable:1;
  97    unsigned point_smooth:1;
  98    unsigned sprite_coord_mode:1;     /**< PIPE_SPRITE_COORD_ */
  99    unsigned point_quad_rasterization:1; /** points rasterized as quads or points */
 100    unsigned point_size_per_vertex:1; /**< size computed in vertex shader */
 101    unsigned multisample:1;         /* XXX maybe more ms state in future */
 102    unsigned line_smooth:1;
 103    unsigned line_stipple_enable:1;
 104    unsigned line_last_pixel:1;
 105
 106    /**
 107     * Use the first vertex of a primitive as the provoking vertex for
 108     * flat shading.
 109     */
 110    unsigned flatshade_first:1;
 111
 112    /**
 113     * When true, triangle rasterization uses (0.5, 0.5) pixel centers
 114     * for determining pixel ownership.
 115     *
 116     * When false, triangle rasterization uses (0,0) pixel centers for
 117     * determining pixel ownership.
 118     *
 119     * Triangle rasterization always uses a 'top,left' rule for pixel
 120     * ownership, this just alters which point we consider the pixel
 121     * center for that test.
 122     */
 123    unsigned gl_rasterization_rules:1;
 124
 125    /**
 126     * When true, rasterization is disabled and no pixels are written.
 127     * This only makes sense with the Stream Out functionality.
 128     */
 129    unsigned rasterizer_discard:1;
 130
 131    /**
 132     * When false, depth clipping is disabled and the depth value will be
 133     * clamped later at the per-pixel level before depth testing.
 134     * This depends on PIPE_CAP_DEPTH_CLIP_DISABLE.
 135     */
 136    unsigned depth_clip:1;
 137
 138    /**
 139     * Enable bits for clipping half-spaces.
 140     * This applies to both user clip planes and shader clip distances.
 141     * Note that if the bound shader exports any clip distances, these
 142     * replace all user clip planes, and clip half-spaces enabled here
 143     * but not written by the shader count as disabled.
 144     */
 145    unsigned clip_plane_enable:PIPE_MAX_CLIP_PLANES;
 146
 147    unsigned line_stipple_factor:8;  /**< [1..256] actually */
 148    unsigned line_stipple_pattern:16;
 149
 150    unsigned sprite_coord_enable:PIPE_MAX_SHADER_OUTPUTS;
 151
 152    float line_width;
 153    float point_size;           /**< used when no per-vertex size */
 154    float offset_units;
 155    float offset_scale;
 156    float offset_clamp;
 157 };
 158
 159
 160 struct pipe_poly_stipple
 161 {
 162    unsigned stipple[32];
 163 };
 164
 165
 166 struct pipe_viewport_state
 167 {
 168    float scale[4];
 169    float translate[4];
 170 };
 171
 172
 173 struct pipe_scissor_state
 174 {
 175    unsigned minx:16;
 176    unsigned miny:16;
 177    unsigned maxx:16;
 178    unsigned maxy:16;
 179 };
 180
 181
 182 struct pipe_clip_state
 183 {
 184    float ucp[PIPE_MAX_CLIP_PLANES][4];
 185 };
 186
 187
 188 /**
 189  * Stream output for vertex transform feedback.
 190  */
 191 struct pipe_stream_output_info
 192 {
 193    unsigned num_outputs;
 194    /** stride for an entire vertex for each buffer in dwords */
 195    unsigned stride[PIPE_MAX_SO_BUFFERS];
 196
 197    /**
 198     * Array of stream outputs, in the order they are to be written in.
 199     * Selected components are tightly packed into the output buffer.
 200     */
 201    struct {
 202       unsigned register_index:8;  /**< 0 to PIPE_MAX_SHADER_OUTPUTS */
 203       unsigned start_component:2; /** 0 to 3 */
 204       unsigned num_components:3;  /** 1 to 4 */
 205       unsigned output_buffer:3;   /**< 0 to PIPE_MAX_SO_BUFFERS */
 206       unsigned dst_offset:16;     /**< offset into the buffer in dwords */
 207    } output[PIPE_MAX_SHADER_OUTPUTS];
 208 };
 209
 210
 211 struct pipe_shader_state
 212 {
 213    const struct tgsi_token *tokens;
 214    struct pipe_stream_output_info stream_output;
 215 };
 216
 217
 218 struct pipe_depth_state
 219 {
 220    unsigned enabled:1;         /**< depth test enabled? */
 221    unsigned writemask:1;       /**< allow depth buffer writes? */
 222    unsigned func:3;            /**< depth test func (PIPE_FUNC_x) */
 223 };
 224
 225
 226 struct pipe_stencil_state
 227 {
 228    unsigned enabled:1;  /**< stencil[0]: stencil enabled, stencil[1]: two-side enabled */
 229    unsigned func:3;     /**< PIPE_FUNC_x */
 230    unsigned fail_op:3;  /**< PIPE_STENCIL_OP_x */
 231    unsigned zpass_op:3; /**< PIPE_STENCIL_OP_x */
 232    unsigned zfail_op:3; /**< PIPE_STENCIL_OP_x */
 233    unsigned valuemask:8;
 234    unsigned writemask:8;
 235 };
 236
 237
 238 struct pipe_alpha_state
 239 {
 240    unsigned enabled:1;
 241    unsigned func:3;     /**< PIPE_FUNC_x */
 242    float ref_value;     /**< reference value */
 243 };
 244
 245
 246 struct pipe_depth_stencil_alpha_state
 247 {
 248    struct pipe_depth_state depth;
 249    struct pipe_stencil_state stencil[2]; /**< [0] = front, [1] = back */
 250    struct pipe_alpha_state alpha;
 251 };
 252
 253
 254 struct pipe_rt_blend_state
 255 {
 256    unsigned blend_enable:1;
 257
 258    unsigned rgb_func:3;          /**< PIPE_BLEND_x */
 259    unsigned rgb_src_factor:5;    /**< PIPE_BLENDFACTOR_x */
 260    unsigned rgb_dst_factor:5;    /**< PIPE_BLENDFACTOR_x */
 261
 262    unsigned alpha_func:3;        /**< PIPE_BLEND_x */
 263    unsigned alpha_src_factor:5;  /**< PIPE_BLENDFACTOR_x */
 264    unsigned alpha_dst_factor:5;  /**< PIPE_BLENDFACTOR_x */
 265
 266    unsigned colormask:4;         /**< bitmask of PIPE_MASK_R/G/B/A */
 267 };
 268
 269 struct pipe_blend_state
 270 {
 271    unsigned independent_blend_enable:1;
 272    unsigned logicop_enable:1;
 273    unsigned logicop_func:4;      /**< PIPE_LOGICOP_x */
 274    unsigned dither:1;
 275    unsigned alpha_to_coverage:1;
 276    unsigned alpha_to_one:1;
 277    struct pipe_rt_blend_state rt[PIPE_MAX_COLOR_BUFS];
 278 };
 279
 280
 281 struct pipe_blend_color
 282 {
 283    float color[4];
 284 };
 285
 286 struct pipe_stencil_ref
 287 {
 288    ubyte ref_value[2];
 289 };
 290
 291 struct pipe_framebuffer_state
 292 {
 293    unsigned width, height;
 294
 295    /** multiple color buffers for multiple render targets */
 296    unsigned nr_cbufs;
 297    struct pipe_surface *cbufs[PIPE_MAX_COLOR_BUFS];
 298
 299    struct pipe_surface *zsbuf;      /**< Z/stencil buffer */
 300 };
 301
 302
 303 /**
 304  * Texture sampler state.
 305  */
 306 struct pipe_sampler_state
 307 {
 308    unsigned wrap_s:3;            /**< PIPE_TEX_WRAP_x */
 309    unsigned wrap_t:3;            /**< PIPE_TEX_WRAP_x */
 310    unsigned wrap_r:3;            /**< PIPE_TEX_WRAP_x */
 311    unsigned min_img_filter:2;    /**< PIPE_TEX_FILTER_x */
 312    unsigned min_mip_filter:2;    /**< PIPE_TEX_MIPFILTER_x */
 313    unsigned mag_img_filter:2;    /**< PIPE_TEX_FILTER_x */
 314    unsigned compare_mode:1;      /**< PIPE_TEX_COMPARE_x */
 315    unsigned compare_func:3;      /**< PIPE_FUNC_x */
 316    unsigned normalized_coords:1; /**< Are coords normalized to [0,1]? */
 317    unsigned max_anisotropy:6;
 318    unsigned seamless_cube_map:1;
 319    float lod_bias;               /**< LOD/lambda bias */
 320    float min_lod, max_lod;       /**< LOD clamp range, after bias */
 321    union pipe_color_union border_color;
 322 };
 323
 324
 325 /**
 326  * A view into a texture that can be bound to a color render target /
 327  * depth stencil attachment point.
 328  */
 329 struct pipe_surface
 330 {
 331    struct pipe_reference reference;
 332    struct pipe_resource *texture; /**< resource into which this is a view  */
 333    struct pipe_context *context; /**< context this surface belongs to */
 334    enum pipe_format format;
 335
 336    /* XXX width/height should be removed */
 337    unsigned width;               /**< logical width in pixels */
 338    unsigned height;              /**< logical height in pixels */
 339
 340    unsigned usage;               /**< bitmask of PIPE_BIND_x */
 341    unsigned writable:1;          /**< writable shader resource */
 342
 343    union {
 344       struct {
 345          unsigned level;
 346          unsigned first_layer:16;
 347          unsigned last_layer:16;
 348       } tex;
 349       struct {
 350          unsigned first_element;
 351          unsigned last_element;
 352       } buf;
 353    } u;
 354 };
 355
 356
 357 /**
 358  * A view into a texture that can be bound to a shader stage.
 359  */
 360 struct pipe_sampler_view
 361 {
 362    struct pipe_reference reference;
 363    enum pipe_format format;      /**< typed PIPE_FORMAT_x */
 364    struct pipe_resource *texture; /**< texture into which this is a view  */
 365    struct pipe_context *context; /**< context this view belongs to */
 366    union {
 367       struct {
 368          unsigned first_layer:16;     /**< first layer to use for array textures */
 369          unsigned last_layer:16;      /**< last layer to use for array textures */
 370          unsigned first_level:8;      /**< first mipmap level to use */
 371          unsigned last_level:8;       /**< last mipmap level to use */
 372       } tex;
 373       struct {
 374          unsigned first_element;
 375          unsigned last_element;
 376       } buf;
 377    } u;
 378    unsigned swizzle_r:3;         /**< PIPE_SWIZZLE_x for red component */
 379    unsigned swizzle_g:3;         /**< PIPE_SWIZZLE_x for green component */
 380    unsigned swizzle_b:3;         /**< PIPE_SWIZZLE_x for blue component */
 381    unsigned swizzle_a:3;         /**< PIPE_SWIZZLE_x for alpha component */
 382 };
 383
 384
 385 /**
 386  * Subregion of 1D/2D/3D image resource.
 387  */
 388 struct pipe_box
 389 {
 390    unsigned x;
 391    unsigned y;
 392    unsigned z;
 393    unsigned width;
 394    unsigned height;
 395    unsigned depth;
 396 };
 397
 398
 399 /**
 400  * A memory object/resource such as a vertex buffer or texture.
 401  */
 402 struct pipe_resource
 403 {
 404    struct pipe_reference reference;
 405    struct pipe_screen *screen; /**< screen that this texture belongs to */
 406    enum pipe_texture_target target; /**< PIPE_TEXTURE_x */
 407    enum pipe_format format;         /**< PIPE_FORMAT_x */
 408
 409    unsigned width0;
 410    unsigned height0;
 411    unsigned depth0;
 412    unsigned array_size;
 413
 414    unsigned last_level:8;    /**< Index of last mipmap level present/defined */
 415    unsigned nr_samples:8;    /**< for multisampled surfaces, nr of samples */
 416    unsigned usage:8;         /**< PIPE_USAGE_x (not a bitmask) */
 417
 418    unsigned bind;            /**< bitmask of PIPE_BIND_x */
 419    unsigned flags;           /**< bitmask of PIPE_RESOURCE_FLAG_x */
 420 };
 421
 422
 423 /**
 424  * Transfer object.  For data transfer to/from a resource.
 425  */
 426 struct pipe_transfer
 427 {
 428    struct pipe_resource *resource; /**< resource to transfer to/from  */
 429    unsigned level;                 /**< texture mipmap level */
 430    enum pipe_transfer_usage usage;
 431    struct pipe_box box;            /**< region of the resource to access */
 432    unsigned stride;                /**< row stride in bytes */
 433    unsigned layer_stride;          /**< image/layer stride in bytes */
 434    void *data;
 435 };
 436
 437
 438
 439 /**
 440  * A vertex buffer.  Typically, all the vertex data/attributes for
 441  * drawing something will be in one buffer.  But it's also possible, for
 442  * example, to put colors in one buffer and texcoords in another.
 443  */
 444 struct pipe_vertex_buffer
 445 {
 446    unsigned stride;    /**< stride to same attrib in next vertex, in bytes */
 447    unsigned buffer_offset;  /**< offset to start of data in buffer, in bytes */
 448    struct pipe_resource *buffer;  /**< the actual buffer */
 449    const void *user_buffer;  /**< pointer to a user buffer if buffer == NULL */
 450 };
 451
 452
 453 /**
 454  * A constant buffer.  A subrange of an existing buffer can be set
 455  * as a constant buffer.
 456  */
 457 struct pipe_constant_buffer {
 458    struct pipe_resource *buffer; /**< the actual buffer */
 459    unsigned buffer_offset; /**< offset to start of data in buffer, in bytes */
 460    unsigned buffer_size;   /**< how much data can be read in shader */
 461    const void *user_buffer;  /**< pointer to a user buffer if buffer == NULL */
 462 };
 463
 464
 465 /**
 466  * A stream output target. The structure specifies the range vertices can
 467  * be written to.
 468  *
 469  * In addition to that, the structure should internally maintain the offset
 470  * into the buffer, which should be incremented everytime something is written
 471  * (appended) to it. The internal offset is buffer_offset + how many bytes
 472  * have been written. The internal offset can be stored on the device
 473  * and the CPU actually doesn't have to query it.
 474  *
 475  * Use PIPE_QUERY_SO_STATISTICS to know how many primitives have
 476  * actually been written.
 477  */
 478 struct pipe_stream_output_target
 479 {
 480    struct pipe_reference reference;
 481    struct pipe_resource *buffer; /**< the output buffer */
 482    struct pipe_context *context; /**< context this SO target belongs to */
 483
 484    unsigned buffer_offset;  /**< offset where data should be written, in bytes */
 485    unsigned buffer_size;    /**< how much data is allowed to be written */
 486 };
 487
 488
 489 /**
 490  * Information to describe a vertex attribute (position, color, etc)
 491  */
 492 struct pipe_vertex_element
 493 {
 494    /** Offset of this attribute, in bytes, from the start of the vertex */
 495    unsigned src_offset;
 496
 497    /** Instance data rate divisor. 0 means this is per-vertex data,
 498     *  n means per-instance data used for n consecutive instances (n > 0).
 499     */
 500    unsigned instance_divisor;
 501
 502    /** Which vertex_buffer (as given to pipe->set_vertex_buffer()) does
 503     * this attribute live in?
 504     */
 505    unsigned vertex_buffer_index;
 506
 507    enum pipe_format src_format;
 508 };
 509
 510
 511 /**
 512  * An index buffer.  When an index buffer is bound, all indices to vertices
 513  * will be looked up in the buffer.
 514  */
 515 struct pipe_index_buffer
 516 {
 517    unsigned index_size;  /**< size of an index, in bytes */
 518    unsigned offset;  /**< offset to start of data in buffer, in bytes */
 519    struct pipe_resource *buffer; /**< the actual buffer */
 520    const void *user_buffer;  /**< pointer to a user buffer if buffer == NULL */
 521 };
 522
 523
 524 /**
 525  * Information to describe a draw_vbo call.
 526  */
 527 struct pipe_draw_info
 528 {
 529    boolean indexed;  /**< use index buffer */
 530
 531    unsigned mode;  /**< the mode of the primitive */
 532    unsigned start;  /**< the index of the first vertex */
 533    unsigned count;  /**< number of vertices */
 534
 535    unsigned start_instance; /**< first instance id */
 536    unsigned instance_count; /**< number of instances */
 537
 538    /**
 539     * For indexed drawing, these fields apply after index lookup.
 540     */
 541    int index_bias; /**< a bias to be added to each index */
 542    unsigned min_index; /**< the min index */
 543    unsigned max_index; /**< the max index */
 544
 545    /**
 546     * Primitive restart enable/index (only applies to indexed drawing)
 547     */
 548    boolean primitive_restart;
 549    unsigned restart_index;
 550
 551    /**
 552     * Stream output target. If not NULL, it's used to provide the 'count'
 553     * parameter based on the number vertices captured by the stream output
 554     * stage. (or generally, based on the number of bytes captured)
 555     *
 556     * Only 'mode', 'start_instance', and 'instance_count' are taken into
 557     * account, all the other variables from pipe_draw_info are ignored.
 558     *
 559     * 'start' is implicitly 0 and 'count' is set as discussed above.
 560     * The draw command is non-indexed.
 561     *
 562     * Note that this only provides the count. The vertex buffers must
 563     * be set via set_vertex_buffers manually.
 564     */
 565    struct pipe_stream_output_target *count_from_stream_output;
 566 };
 567
 568
 569 /**
 570  * Information to describe a resource_resolve call.
 571  */
 572 struct pipe_resolve_info
 573 {
 574    struct {
 575       struct pipe_resource *res;
 576       unsigned level;
 577       unsigned layer;
 578       int x0; /**< always left */
 579       int y0; /**< always top */
 580       int x1; /**< determines scale if PIPE_CAP_SCALED_RESOLVE is supported */
 581       int y1; /**< determines scale if PIPE_CAP_SCALED_RESOLVE is supported */
 582    } dst;
 583
 584    struct {
 585       struct pipe_resource *res;
 586       unsigned layer;
 587       int x0;
 588       int y0;
 589       int x1; /**< may be < x0 only if PIPE_CAP_SCALED_RESOLVE is supported */
 590       int y1; /**< may be < y1 even if PIPE_CAP_SCALED_RESOLVE not supported */
 591    } src;
 592
 593    unsigned mask; /**< PIPE_MASK_RGBA, Z, S or ZS */
 594 };
 595
 596 struct pipe_compute_state
 597 {
 598    const void *prog; /**< Compute program to be executed. */
 599    unsigned req_local_mem; /**< Required size of the LOCAL resource. */
 600    unsigned req_private_mem; /**< Required size of the PRIVATE resource. */
 601    unsigned req_input_mem; /**< Required size of the INPUT resource. */
 602 };
 603
 604 #ifdef __cplusplus
 605 }
 606 #endif
 607
 608 #endif