p_state.h revision 683e35f726a182ed9fc6b6d5cb07146eebe14dea
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#include "p_refcnt.h" 47#include "p_screen.h" 48 49 50#ifdef __cplusplus 51extern "C" { 52#endif 53 54 55/** 56 * Implementation limits 57 */ 58#define PIPE_MAX_ATTRIBS 32 59#define PIPE_MAX_CLIP_PLANES 6 60#define PIPE_MAX_COLOR_BUFS 8 61#define PIPE_MAX_CONSTANT 32 62#define PIPE_MAX_SAMPLERS 16 63#define PIPE_MAX_SHADER_INPUTS 16 64#define PIPE_MAX_SHADER_OUTPUTS 16 65#define PIPE_MAX_TEXTURE_LEVELS 16 66 67 68/* fwd decls */ 69struct pipe_surface; 70 71 72/** 73 * The driver will certainly subclass this to include actual memory 74 * management information. 75 */ 76struct pipe_buffer 77{ 78 struct pipe_reference reference; 79 unsigned size; 80 struct pipe_screen *screen; 81 unsigned alignment; 82 unsigned usage; 83}; 84 85 86/** 87 * Primitive (point/line/tri) rasterization info 88 */ 89struct pipe_rasterizer_state 90{ 91 unsigned flatshade:1; 92 unsigned light_twoside:1; 93 unsigned front_winding:2; /**< PIPE_WINDING_x */ 94 unsigned cull_mode:2; /**< PIPE_WINDING_x */ 95 unsigned fill_cw:2; /**< PIPE_POLYGON_MODE_x */ 96 unsigned fill_ccw:2; /**< PIPE_POLYGON_MODE_x */ 97 unsigned offset_cw:1; 98 unsigned offset_ccw:1; 99 unsigned scissor:1; 100 unsigned poly_smooth:1; 101 unsigned poly_stipple_enable:1; 102 unsigned point_smooth:1; 103 unsigned point_sprite:1; 104 unsigned point_size_per_vertex:1; /**< size computed in vertex shader */ 105 unsigned multisample:1; /* XXX maybe more ms state in future */ 106 unsigned line_smooth:1; 107 unsigned line_stipple_enable:1; 108 unsigned line_stipple_factor:8; /**< [1..256] actually */ 109 unsigned line_stipple_pattern:16; 110 unsigned line_last_pixel:1; 111 112 /** 113 * Vertex coordinates are pre-transformed to screen space. Skip 114 * the vertex shader, clipping and viewport processing. Note that 115 * a vertex shader is still needed though, to indicate the mapping 116 * from vertex elements to fragment shader input semantics. 117 * 118 * XXX: considered for removal. 119 */ 120 unsigned bypass_vs_clip_and_viewport:1; 121 122 /** 123 * Use the first vertex of a primitive as the provoking vertex for 124 * flat shading. 125 */ 126 unsigned flatshade_first:1; 127 128 /** 129 * When true, triangle rasterization uses (0.5, 0.5) pixel centers 130 * for determining pixel ownership. 131 * 132 * When false, triangle rasterization uses (0,0) pixel centers for 133 * determining pixel ownership. 134 * 135 * Triangle rasterization always uses a 'top,left' rule for pixel 136 * ownership, this just alters which point we consider the pixel 137 * center for that test. 138 */ 139 unsigned gl_rasterization_rules:1; 140 141 float line_width; 142 float point_size; /**< used when no per-vertex size */ 143 float point_size_min; /* XXX - temporary, will go away */ 144 float point_size_max; /* XXX - temporary, will go away */ 145 float offset_units; 146 float offset_scale; 147 ubyte sprite_coord_mode[PIPE_MAX_SHADER_OUTPUTS]; /**< PIPE_SPRITE_COORD_ */ 148}; 149 150 151struct pipe_poly_stipple 152{ 153 unsigned stipple[32]; 154}; 155 156 157struct pipe_viewport_state 158{ 159 float scale[4]; 160 float translate[4]; 161}; 162 163 164struct pipe_scissor_state 165{ 166 unsigned minx:16; 167 unsigned miny:16; 168 unsigned maxx:16; 169 unsigned maxy:16; 170}; 171 172 173struct pipe_clip_state 174{ 175 float ucp[PIPE_MAX_CLIP_PLANES][4]; 176 unsigned nr; 177}; 178 179 180/** 181 * Constants for vertex/fragment shaders 182 */ 183struct pipe_constant_buffer 184{ 185 struct pipe_buffer *buffer; 186}; 187 188 189struct pipe_shader_state 190{ 191 const struct tgsi_token *tokens; 192}; 193 194 195struct pipe_depth_state 196{ 197 unsigned enabled:1; /**< depth test enabled? */ 198 unsigned writemask:1; /**< allow depth buffer writes? */ 199 unsigned func:3; /**< depth test func (PIPE_FUNC_x) */ 200}; 201 202 203struct pipe_stencil_state 204{ 205 unsigned enabled:1; /**< stencil[0]: stencil enabled, stencil[1]: two-side enabled */ 206 unsigned func:3; /**< PIPE_FUNC_x */ 207 unsigned fail_op:3; /**< PIPE_STENCIL_OP_x */ 208 unsigned zpass_op:3; /**< PIPE_STENCIL_OP_x */ 209 unsigned zfail_op:3; /**< PIPE_STENCIL_OP_x */ 210 ubyte ref_value; 211 ubyte valuemask; 212 ubyte writemask; 213}; 214 215 216struct pipe_alpha_state 217{ 218 unsigned enabled:1; 219 unsigned func:3; /**< PIPE_FUNC_x */ 220 float ref_value; /**< reference value */ 221}; 222 223 224struct pipe_depth_stencil_alpha_state 225{ 226 struct pipe_depth_state depth; 227 struct pipe_stencil_state stencil[2]; /**< [0] = front, [1] = back */ 228 struct pipe_alpha_state alpha; 229}; 230 231 232struct pipe_blend_state 233{ 234 unsigned blend_enable:1; 235 236 unsigned rgb_func:3; /**< PIPE_BLEND_x */ 237 unsigned rgb_src_factor:5; /**< PIPE_BLENDFACTOR_x */ 238 unsigned rgb_dst_factor:5; /**< PIPE_BLENDFACTOR_x */ 239 240 unsigned alpha_func:3; /**< PIPE_BLEND_x */ 241 unsigned alpha_src_factor:5; /**< PIPE_BLENDFACTOR_x */ 242 unsigned alpha_dst_factor:5; /**< PIPE_BLENDFACTOR_x */ 243 244 unsigned logicop_enable:1; 245 unsigned logicop_func:4; /**< PIPE_LOGICOP_x */ 246 247 unsigned colormask:4; /**< bitmask of PIPE_MASK_R/G/B/A */ 248 unsigned dither:1; 249}; 250 251 252struct pipe_blend_color 253{ 254 float color[4]; 255}; 256 257 258struct pipe_framebuffer_state 259{ 260 unsigned width, height; 261 262 /** multiple colorbuffers for multiple render targets */ 263 unsigned nr_cbufs; 264 struct pipe_surface *cbufs[PIPE_MAX_COLOR_BUFS]; 265 266 struct pipe_surface *zsbuf; /**< Z/stencil buffer */ 267}; 268 269 270/** 271 * Texture sampler state. 272 */ 273struct pipe_sampler_state 274{ 275 unsigned wrap_s:3; /**< PIPE_TEX_WRAP_x */ 276 unsigned wrap_t:3; /**< PIPE_TEX_WRAP_x */ 277 unsigned wrap_r:3; /**< PIPE_TEX_WRAP_x */ 278 unsigned min_img_filter:2; /**< PIPE_TEX_FILTER_x */ 279 unsigned min_mip_filter:2; /**< PIPE_TEX_MIPFILTER_x */ 280 unsigned mag_img_filter:2; /**< PIPE_TEX_FILTER_x */ 281 unsigned compare_mode:1; /**< PIPE_TEX_COMPARE_x */ 282 unsigned compare_func:3; /**< PIPE_FUNC_x */ 283 unsigned normalized_coords:1; /**< Are coords normalized to [0,1]? */ 284 unsigned prefilter:4; /**< Wierd sampling state exposed by some api's */ 285 float lod_bias; /**< LOD/lambda bias */ 286 float min_lod, max_lod; /**< LOD clamp range, after bias */ 287 float border_color[4]; 288 float max_anisotropy; 289}; 290 291 292/** 293 * 2D surface. This is basically a view into a memory buffer. 294 * May be a renderbuffer, texture mipmap level, etc. 295 */ 296struct pipe_surface 297{ 298 struct pipe_reference reference; 299 enum pipe_format format; /**< PIPE_FORMAT_x */ 300 unsigned width; /**< logical width in pixels */ 301 unsigned height; /**< logical height in pixels */ 302 unsigned layout; /**< PIPE_SURFACE_LAYOUT_x */ 303 unsigned offset; /**< offset from start of buffer, in bytes */ 304 unsigned usage; /**< PIPE_BUFFER_USAGE_* */ 305 306 unsigned zslice; 307 struct pipe_texture *texture; /**< texture into which this is a view */ 308 unsigned face; 309 unsigned level; 310}; 311 312 313/** 314 * Transfer object. For data transfer to/from a texture. 315 */ 316struct pipe_transfer 317{ 318 enum pipe_format format; /**< PIPE_FORMAT_x */ 319 unsigned x; /**< x offset from start of texture image */ 320 unsigned y; /**< y offset from start of texture image */ 321 unsigned width; /**< logical width in pixels */ 322 unsigned height; /**< logical height in pixels */ 323 struct pipe_format_block block; 324 unsigned nblocksx; /**< allocated width in blocks */ 325 unsigned nblocksy; /**< allocated height in blocks */ 326 unsigned stride; /**< stride in bytes between rows of blocks */ 327 enum pipe_transfer_usage usage; /**< PIPE_TRANSFER_* */ 328 329 struct pipe_texture *texture; /**< texture to transfer to/from */ 330 unsigned face; 331 unsigned level; 332 unsigned zslice; 333}; 334 335 336/** 337 * Texture object. 338 */ 339struct pipe_texture 340{ 341 struct pipe_reference reference; 342 343 enum pipe_texture_target target; /**< PIPE_TEXTURE_x */ 344 enum pipe_format format; /**< PIPE_FORMAT_x */ 345 346 unsigned width0; 347 unsigned height0; 348 unsigned depth0; 349 350 struct pipe_format_block block; 351 unsigned nblocksx[PIPE_MAX_TEXTURE_LEVELS]; /**< allocated width in blocks */ 352 unsigned nblocksy[PIPE_MAX_TEXTURE_LEVELS]; /**< allocated height in blocks */ 353 354 unsigned last_level:8; /**< Index of last mipmap level present/defined */ 355 356 unsigned nr_samples:8; /**< for multisampled surfaces, nr of samples */ 357 358 unsigned tex_usage; /* PIPE_TEXTURE_USAGE_* */ 359 360 struct pipe_screen *screen; /**< screen that this texture belongs to */ 361}; 362 363 364/** 365 * A vertex buffer. Typically, all the vertex data/attributes for 366 * drawing something will be in one buffer. But it's also possible, for 367 * example, to put colors in one buffer and texcoords in another. 368 */ 369struct pipe_vertex_buffer 370{ 371 unsigned stride; /**< stride to same attrib in next vertex, in bytes */ 372 unsigned max_index; /**< number of vertices in this buffer */ 373 unsigned buffer_offset; /**< offset to start of data in buffer, in bytes */ 374 struct pipe_buffer *buffer; /**< the actual buffer */ 375}; 376 377 378/** 379 * Information to describe a vertex attribute (position, color, etc) 380 */ 381struct pipe_vertex_element 382{ 383 /** Offset of this attribute, in bytes, from the start of the vertex */ 384 unsigned src_offset; 385 386 /** Which vertex_buffer (as given to pipe->set_vertex_buffer()) does 387 * this attribute live in? 388 */ 389 unsigned vertex_buffer_index:8; 390 unsigned nr_components:8; 391 392 enum pipe_format src_format; /**< PIPE_FORMAT_* */ 393}; 394 395 396/* Reference counting helper functions */ 397static INLINE void 398pipe_buffer_reference(struct pipe_buffer **ptr, struct pipe_buffer *buf) 399{ 400 struct pipe_buffer *old_buf = *ptr; 401 402 if (pipe_reference((struct pipe_reference **)ptr, &buf->reference)) 403 old_buf->screen->buffer_destroy(old_buf); 404} 405 406static INLINE void 407pipe_surface_reference(struct pipe_surface **ptr, struct pipe_surface *surf) 408{ 409 struct pipe_surface *old_surf = *ptr; 410 411 if (pipe_reference((struct pipe_reference **)ptr, &surf->reference)) 412 old_surf->texture->screen->tex_surface_destroy(old_surf); 413} 414 415static INLINE void 416pipe_texture_reference(struct pipe_texture **ptr, struct pipe_texture *tex) 417{ 418 struct pipe_texture *old_tex = *ptr; 419 420 if (pipe_reference((struct pipe_reference **)ptr, &tex->reference)) 421 old_tex->screen->texture_destroy(old_tex); 422} 423 424 425#ifdef __cplusplus 426} 427#endif 428 429#endif 430