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