src/gallium/include/pipe/p_state.h

   1 /**************************************************************************
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   3  * Copyright 2007 VMware, Inc.
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  11  * permit persons to whom the Software is furnished to do so, subject to
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  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
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  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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  25  *
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  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_SHADER_INPUTS    32
  62 #define PIPE_MAX_SHADER_OUTPUTS   48 /* 32 GENERICs + POS, PSIZE, FOG, etc. */
  63 #define PIPE_MAX_SHADER_SAMPLER_VIEWS 32
  64 #define PIPE_MAX_SHADER_RESOURCES 32
  65 #define PIPE_MAX_TEXTURE_LEVELS   16
  66 #define PIPE_MAX_SO_BUFFERS        4
  67 #define PIPE_MAX_SO_OUTPUTS       64
  68 #define PIPE_MAX_VIEWPORTS        16
  69 #define PIPE_MAX_CLIP_OR_CULL_DISTANCE_COUNT 8
  70 #define PIPE_MAX_CLIP_OR_CULL_DISTANCE_ELEMENT_COUNT 2
  71
  72
  73 struct pipe_reference
  74 {
  75    int32_t count; /* atomic */
  76 };
  77
  78
  79
  80 /**
  81  * Primitive (point/line/tri) rasterization info
  82  */
  83 struct pipe_rasterizer_state
  84 {
  85    unsigned flatshade:1;
  86    unsigned light_twoside:1;
  87    unsigned clamp_vertex_color:1;
  88    unsigned clamp_fragment_color:1;
  89    unsigned front_ccw:1;
  90    unsigned cull_face:2;      /**< PIPE_FACE_x */
  91    unsigned fill_front:2;     /**< PIPE_POLYGON_MODE_x */
  92    unsigned fill_back:2;      /**< PIPE_POLYGON_MODE_x */
  93    unsigned offset_point:1;
  94    unsigned offset_line:1;
  95    unsigned offset_tri:1;
  96    unsigned scissor:1;
  97    unsigned poly_smooth:1;
  98    unsigned poly_stipple_enable:1;
  99    unsigned point_smooth:1;
 100    unsigned sprite_coord_mode:1;     /**< PIPE_SPRITE_COORD_ */
 101    unsigned point_quad_rasterization:1; /** points rasterized as quads or points */
 102    unsigned point_tri_clip:1; /** large points clipped as tris or points */
 103    unsigned point_size_per_vertex:1; /**< size computed in vertex shader */
 104    unsigned multisample:1;         /* XXX maybe more ms state in future */
 105    unsigned line_smooth:1;
 106    unsigned line_stipple_enable:1;
 107    unsigned line_last_pixel:1;
 108
 109    /**
 110     * Use the first vertex of a primitive as the provoking vertex for
 111     * flat shading.
 112     */
 113    unsigned flatshade_first:1;
 114
 115    unsigned half_pixel_center:1;
 116    unsigned bottom_edge_rule:1;
 117
 118    /**
 119     * When true, rasterization is disabled and no pixels are written.
 120     * This only makes sense with the Stream Out functionality.
 121     */
 122    unsigned rasterizer_discard:1;
 123
 124    /**
 125     * When false, depth clipping is disabled and the depth value will be
 126     * clamped later at the per-pixel level before depth testing.
 127     * This depends on PIPE_CAP_DEPTH_CLIP_DISABLE.
 128     */
 129    unsigned depth_clip:1;
 130
 131    /**
 132     * When true clip space in the z axis goes from [0..1] (D3D).  When false
 133     * [-1, 1] (GL).
 134     *
 135     * NOTE: D3D will always use depth clamping.
 136     */
 137    unsigned clip_halfz:1;
 138
 139    /**
 140     * Enable bits for clipping half-spaces.
 141     * This applies to both user clip planes and shader clip distances.
 142     * Note that if the bound shader exports any clip distances, these
 143     * replace all user clip planes, and clip half-spaces enabled here
 144     * but not written by the shader count as disabled.
 145     */
 146    unsigned clip_plane_enable:PIPE_MAX_CLIP_PLANES;
 147
 148    unsigned line_stipple_factor:8;  /**< [1..256] actually */
 149    unsigned line_stipple_pattern:16;
 150
 151    uint32_t sprite_coord_enable; /* referring to 32 TEXCOORD/GENERIC inputs */
 152
 153    float line_width;
 154    float point_size;           /**< used when no per-vertex size */
 155    float offset_units;
 156    float offset_scale;
 157    float offset_clamp;
 158 };
 159
 160
 161 struct pipe_poly_stipple
 162 {
 163    unsigned stipple[32];
 164 };
 165
 166
 167 struct pipe_viewport_state
 168 {
 169    float scale[3];
 170    float translate[3];
 171 };
 172
 173
 174 struct pipe_scissor_state
 175 {
 176    unsigned minx:16;
 177    unsigned miny:16;
 178    unsigned maxx:16;
 179    unsigned maxy:16;
 180 };
 181
 182
 183 struct pipe_clip_state
 184 {
 185    float ucp[PIPE_MAX_CLIP_PLANES][4];
 186 };
 187
 188
 189 /**
 190  * Stream output for vertex transform feedback.
 191  */
 192 struct pipe_stream_output_info
 193 {
 194    unsigned num_outputs;
 195    /** stride for an entire vertex for each buffer in dwords */
 196    unsigned stride[PIPE_MAX_SO_BUFFERS];
 197
 198    /**
 199     * Array of stream outputs, in the order they are to be written in.
 200     * Selected components are tightly packed into the output buffer.
 201     */
 202    struct {
 203       unsigned register_index:8;  /**< 0 to PIPE_MAX_SHADER_OUTPUTS */
 204       unsigned start_component:2; /** 0 to 3 */
 205       unsigned num_components:3;  /** 1 to 4 */
 206       unsigned output_buffer:3;   /**< 0 to PIPE_MAX_SO_BUFFERS */
 207       unsigned dst_offset:16;     /**< offset into the buffer in dwords */
 208       unsigned stream:2;          /**< 0 to 3 */
 209    } output[PIPE_MAX_SO_OUTPUTS];
 210 };
 211
 212
 213 struct pipe_shader_state
 214 {
 215    const struct tgsi_token *tokens;
 216    struct pipe_stream_output_info stream_output;
 217 };
 218
 219
 220 struct pipe_depth_state
 221 {
 222    unsigned enabled:1;         /**< depth test enabled? */
 223    unsigned writemask:1;       /**< allow depth buffer writes? */
 224    unsigned func:3;            /**< depth test func (PIPE_FUNC_x) */
 225 };
 226
 227
 228 struct pipe_stencil_state
 229 {
 230    unsigned enabled:1;  /**< stencil[0]: stencil enabled, stencil[1]: two-side enabled */
 231    unsigned func:3;     /**< PIPE_FUNC_x */
 232    unsigned fail_op:3;  /**< PIPE_STENCIL_OP_x */
 233    unsigned zpass_op:3; /**< PIPE_STENCIL_OP_x */
 234    unsigned zfail_op:3; /**< PIPE_STENCIL_OP_x */
 235    unsigned valuemask:8;
 236    unsigned writemask:8;
 237 };
 238
 239
 240 struct pipe_alpha_state
 241 {
 242    unsigned enabled:1;
 243    unsigned func:3;     /**< PIPE_FUNC_x */
 244    float ref_value;     /**< reference value */
 245 };
 246
 247
 248 struct pipe_depth_stencil_alpha_state
 249 {
 250    struct pipe_depth_state depth;
 251    struct pipe_stencil_state stencil[2]; /**< [0] = front, [1] = back */
 252    struct pipe_alpha_state alpha;
 253 };
 254
 255
 256 struct pipe_rt_blend_state
 257 {
 258    unsigned blend_enable:1;
 259
 260    unsigned rgb_func:3;          /**< PIPE_BLEND_x */
 261    unsigned rgb_src_factor:5;    /**< PIPE_BLENDFACTOR_x */
 262    unsigned rgb_dst_factor:5;    /**< PIPE_BLENDFACTOR_x */
 263
 264    unsigned alpha_func:3;        /**< PIPE_BLEND_x */
 265    unsigned alpha_src_factor:5;  /**< PIPE_BLENDFACTOR_x */
 266    unsigned alpha_dst_factor:5;  /**< PIPE_BLENDFACTOR_x */
 267
 268    unsigned colormask:4;         /**< bitmask of PIPE_MASK_R/G/B/A */
 269 };
 270
 271 struct pipe_blend_state
 272 {
 273    unsigned independent_blend_enable:1;
 274    unsigned logicop_enable:1;
 275    unsigned logicop_func:4;      /**< PIPE_LOGICOP_x */
 276    unsigned dither:1;
 277    unsigned alpha_to_coverage:1;
 278    unsigned alpha_to_one:1;
 279    struct pipe_rt_blend_state rt[PIPE_MAX_COLOR_BUFS];
 280 };
 281
 282
 283 struct pipe_blend_color
 284 {
 285    float color[4];
 286 };
 287
 288 struct pipe_stencil_ref
 289 {
 290    ubyte ref_value[2];
 291 };
 292
 293 struct pipe_framebuffer_state
 294 {
 295    unsigned width, height;
 296
 297    /** multiple color buffers for multiple render targets */
 298    unsigned nr_cbufs;
 299    struct pipe_surface *cbufs[PIPE_MAX_COLOR_BUFS];
 300
 301    struct pipe_surface *zsbuf;      /**< Z/stencil buffer */
 302 };
 303
 304
 305 /**
 306  * Texture sampler state.
 307  */
 308 struct pipe_sampler_state
 309 {
 310    unsigned wrap_s:3;            /**< PIPE_TEX_WRAP_x */
 311    unsigned wrap_t:3;            /**< PIPE_TEX_WRAP_x */
 312    unsigned wrap_r:3;            /**< PIPE_TEX_WRAP_x */
 313    unsigned min_img_filter:2;    /**< PIPE_TEX_FILTER_x */
 314    unsigned min_mip_filter:2;    /**< PIPE_TEX_MIPFILTER_x */
 315    unsigned mag_img_filter:2;    /**< PIPE_TEX_FILTER_x */
 316    unsigned compare_mode:1;      /**< PIPE_TEX_COMPARE_x */
 317    unsigned compare_func:3;      /**< PIPE_FUNC_x */
 318    unsigned normalized_coords:1; /**< Are coords normalized to [0,1]? */
 319    unsigned max_anisotropy:6;
 320    unsigned seamless_cube_map:1;
 321    float lod_bias;               /**< LOD/lambda bias */
 322    float min_lod, max_lod;       /**< LOD clamp range, after bias */
 323    union pipe_color_union border_color;
 324 };
 325
 326
 327 /**
 328  * A view into a texture that can be bound to a color render target /
 329  * depth stencil attachment point.
 330  */
 331 struct pipe_surface
 332 {
 333    struct pipe_reference reference;
 334    struct pipe_resource *texture; /**< resource into which this is a view  */
 335    struct pipe_context *context; /**< context this surface belongs to */
 336    enum pipe_format format;
 337
 338    /* XXX width/height should be removed */
 339    unsigned width;               /**< logical width in pixels */
 340    unsigned height;              /**< logical height in pixels */
 341
 342    unsigned writable:1;          /**< writable shader resource */
 343
 344    union {
 345       struct {
 346          unsigned level;
 347          unsigned first_layer:16;
 348          unsigned last_layer:16;
 349       } tex;
 350       struct {
 351          unsigned first_element;
 352          unsigned last_element;
 353       } buf;
 354    } u;
 355 };
 356
 357
 358 /**
 359  * A view into a texture that can be bound to a shader stage.
 360  */
 361 struct pipe_sampler_view
 362 {
 363    struct pipe_reference reference;
 364    enum pipe_texture_target target; /**< PIPE_TEXTURE_x */
 365    enum pipe_format format;      /**< typed PIPE_FORMAT_x */
 366    struct pipe_resource *texture; /**< texture into which this is a view  */
 367    struct pipe_context *context; /**< context this view belongs to */
 368    union {
 369       struct {
 370          unsigned first_layer:16;     /**< first layer to use for array textures */
 371          unsigned last_layer:16;      /**< last layer to use for array textures */
 372          unsigned first_level:8;      /**< first mipmap level to use */
 373          unsigned last_level:8;       /**< last mipmap level to use */
 374       } tex;
 375       struct {
 376          unsigned first_element;
 377          unsigned last_element;
 378       } buf;
 379    } u;
 380    unsigned swizzle_r:3;         /**< PIPE_SWIZZLE_x for red component */
 381    unsigned swizzle_g:3;         /**< PIPE_SWIZZLE_x for green component */
 382    unsigned swizzle_b:3;         /**< PIPE_SWIZZLE_x for blue component */
 383    unsigned swizzle_a:3;         /**< PIPE_SWIZZLE_x for alpha component */
 384 };
 385
 386
 387 /**
 388  * Subregion of 1D/2D/3D image resource.
 389  */
 390 struct pipe_box
 391 {
 392    int x;
 393    int y;
 394    int z;
 395    int width;
 396    int height;
 397    int depth;
 398 };
 399
 400
 401 /**
 402  * A memory object/resource such as a vertex buffer or texture.
 403  */
 404 struct pipe_resource
 405 {
 406    struct pipe_reference reference;
 407    struct pipe_screen *screen; /**< screen that this texture belongs to */
 408    enum pipe_texture_target target; /**< PIPE_TEXTURE_x */
 409    enum pipe_format format;         /**< PIPE_FORMAT_x */
 410
 411    unsigned width0;
 412    unsigned height0;
 413    unsigned depth0;
 414    unsigned array_size;
 415
 416    unsigned last_level:8;    /**< Index of last mipmap level present/defined */
 417    unsigned nr_samples:8;    /**< for multisampled surfaces, nr of samples */
 418    unsigned usage:8;         /**< PIPE_USAGE_x (not a bitmask) */
 419
 420    unsigned bind;            /**< bitmask of PIPE_BIND_x */
 421    unsigned flags;           /**< bitmask of PIPE_RESOURCE_FLAG_x */
 422 };
 423
 424
 425 /**
 426  * Transfer object.  For data transfer to/from a resource.
 427  */
 428 struct pipe_transfer
 429 {
 430    struct pipe_resource *resource; /**< resource to transfer to/from  */
 431    unsigned level;                 /**< texture mipmap level */
 432    enum pipe_transfer_usage usage;
 433    struct pipe_box box;            /**< region of the resource to access */
 434    unsigned stride;                /**< row stride in bytes */
 435    unsigned layer_stride;          /**< image/layer stride in bytes */
 436 };
 437
 438
 439
 440 /**
 441  * A vertex buffer.  Typically, all the vertex data/attributes for
 442  * drawing something will be in one buffer.  But it's also possible, for
 443  * example, to put colors in one buffer and texcoords in another.
 444  */
 445 struct pipe_vertex_buffer
 446 {
 447    unsigned stride;    /**< stride to same attrib in next vertex, in bytes */
 448    unsigned buffer_offset;  /**< offset to start of data in buffer, in bytes */
 449    struct pipe_resource *buffer;  /**< the actual buffer */
 450    const void *user_buffer;  /**< pointer to a user buffer if buffer == NULL */
 451 };
 452
 453
 454 /**
 455  * A constant buffer.  A subrange of an existing buffer can be set
 456  * as a constant buffer.
 457  */
 458 struct pipe_constant_buffer {
 459    struct pipe_resource *buffer; /**< the actual buffer */
 460    unsigned buffer_offset; /**< offset to start of data in buffer, in bytes */
 461    unsigned buffer_size;   /**< how much data can be read in shader */
 462    const void *user_buffer;  /**< pointer to a user buffer if buffer == NULL */
 463 };
 464
 465
 466 /**
 467  * A stream output target. The structure specifies the range vertices can
 468  * be written to.
 469  *
 470  * In addition to that, the structure should internally maintain the offset
 471  * into the buffer, which should be incremented everytime something is written
 472  * (appended) to it. The internal offset is buffer_offset + how many bytes
 473  * have been written. The internal offset can be stored on the device
 474  * and the CPU actually doesn't have to query it.
 475  *
 476  * Note that the buffer_size variable is actually specifying the available
 477  * space in the buffer, not the size of the attached buffer.
 478  * In other words in majority of cases buffer_size would simply be
 479  * 'buffer->width0 - buffer_offset', so buffer_size refers to the size
 480  * of the buffer left, after accounting for buffer offset, for stream output
 481  * to write to.
 482  *
 483  * Use PIPE_QUERY_SO_STATISTICS to know how many primitives have
 484  * actually been written.
 485  */
 486 struct pipe_stream_output_target
 487 {
 488    struct pipe_reference reference;
 489    struct pipe_resource *buffer; /**< the output buffer */
 490    struct pipe_context *context; /**< context this SO target belongs to */
 491
 492    unsigned buffer_offset;  /**< offset where data should be written, in bytes */
 493    unsigned buffer_size;    /**< how much data is allowed to be written */
 494 };
 495
 496
 497 /**
 498  * Information to describe a vertex attribute (position, color, etc)
 499  */
 500 struct pipe_vertex_element
 501 {
 502    /** Offset of this attribute, in bytes, from the start of the vertex */
 503    unsigned src_offset;
 504
 505    /** Instance data rate divisor. 0 means this is per-vertex data,
 506     *  n means per-instance data used for n consecutive instances (n > 0).
 507     */
 508    unsigned instance_divisor;
 509
 510    /** Which vertex_buffer (as given to pipe->set_vertex_buffer()) does
 511     * this attribute live in?
 512     */
 513    unsigned vertex_buffer_index;
 514
 515    enum pipe_format src_format;
 516 };
 517
 518
 519 /**
 520  * An index buffer.  When an index buffer is bound, all indices to vertices
 521  * will be looked up in the buffer.
 522  */
 523 struct pipe_index_buffer
 524 {
 525    unsigned index_size;  /**< size of an index, in bytes */
 526    unsigned offset;  /**< offset to start of data in buffer, in bytes */
 527    struct pipe_resource *buffer; /**< the actual buffer */
 528    const void *user_buffer;  /**< pointer to a user buffer if buffer == NULL */
 529 };
 530
 531
 532 /**
 533  * Information to describe a draw_vbo call.
 534  */
 535 struct pipe_draw_info
 536 {
 537    boolean indexed;  /**< use index buffer */
 538
 539    unsigned mode;  /**< the mode of the primitive */
 540    unsigned start;  /**< the index of the first vertex */
 541    unsigned count;  /**< number of vertices */
 542
 543    unsigned start_instance; /**< first instance id */
 544    unsigned instance_count; /**< number of instances */
 545
 546    /**
 547     * For indexed drawing, these fields apply after index lookup.
 548     */
 549    int index_bias; /**< a bias to be added to each index */
 550    unsigned min_index; /**< the min index */
 551    unsigned max_index; /**< the max index */
 552
 553    /**
 554     * Primitive restart enable/index (only applies to indexed drawing)
 555     */
 556    boolean primitive_restart;
 557    unsigned restart_index;
 558
 559    /**
 560     * Stream output target. If not NULL, it's used to provide the 'count'
 561     * parameter based on the number vertices captured by the stream output
 562     * stage. (or generally, based on the number of bytes captured)
 563     *
 564     * Only 'mode', 'start_instance', and 'instance_count' are taken into
 565     * account, all the other variables from pipe_draw_info are ignored.
 566     *
 567     * 'start' is implicitly 0 and 'count' is set as discussed above.
 568     * The draw command is non-indexed.
 569     *
 570     * Note that this only provides the count. The vertex buffers must
 571     * be set via set_vertex_buffers manually.
 572     */
 573    struct pipe_stream_output_target *count_from_stream_output;
 574
 575    /* Indirect parameters resource: If not NULL, most values are taken
 576     * from this buffer instead, which is laid out as follows:
 577     *
 578     * if indexed is TRUE:
 579     *  struct {
 580     *     uint32_t count;
 581     *     uint32_t instance_count;
 582     *     uint32_t start;
 583     *     int32_t index_bias;
 584     *     uint32_t start_instance;
 585     *  };
 586     * otherwise:
 587     *  struct {
 588     *     uint32_t count;
 589     *     uint32_t instance_count;
 590     *     uint32_t start;
 591     *     uint32_t start_instance;
 592     *  };
 593     */
 594    struct pipe_resource *indirect;
 595    unsigned indirect_offset; /**< must be 4 byte aligned */
 596 };
 597
 598
 599 /**
 600  * Information to describe a blit call.
 601  */
 602 struct pipe_blit_info
 603 {
 604    struct {
 605       struct pipe_resource *resource;
 606       unsigned level;
 607       struct pipe_box box; /**< negative width, height only legal for src */
 608       /* For pipe_surface-like format casting: */
 609       enum pipe_format format; /**< must be supported for sampling (src)
 610                                or rendering (dst), ZS is always supported */
 611    } dst, src;
 612
 613    unsigned mask; /**< bitmask of PIPE_MASK_R/G/B/A/Z/S */
 614    unsigned filter; /**< PIPE_TEX_FILTER_* */
 615
 616    boolean scissor_enable;
 617    struct pipe_scissor_state scissor;
 618
 619    boolean render_condition_enable; /**< whether the blit should honor the
 620                                     current render condition */
 621 };
 622
 623
 624 /**
 625  * Structure used as a header for serialized LLVM programs.
 626  */
 627 struct pipe_llvm_program_header
 628 {
 629    uint32_t num_bytes; /**< Number of bytes in the LLVM bytecode program. */
 630 };
 631
 632 struct pipe_compute_state
 633 {
 634    const void *prog; /**< Compute program to be executed. */
 635    unsigned req_local_mem; /**< Required size of the LOCAL resource. */
 636    unsigned req_private_mem; /**< Required size of the PRIVATE resource. */
 637    unsigned req_input_mem; /**< Required size of the INPUT resource. */
 638 };
 639
 640 #ifdef __cplusplus
 641 }
 642 #endif
 643
 644 #endif