p_state.h revision 5184b02b0793136a15b7edf309d79a1efe1bc73d
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_VERTEX_SAMPLERS 16 64#define PIPE_MAX_SHADER_INPUTS 16 65#define PIPE_MAX_SHADER_OUTPUTS 16 66#define PIPE_MAX_TEXTURE_LEVELS 16 67 68 69/** 70 * The driver will certainly subclass this to include actual memory 71 * management information. 72 */ 73struct pipe_buffer 74{ 75 struct pipe_reference reference; 76 unsigned size; 77 struct pipe_screen *screen; 78 unsigned alignment; 79 unsigned usage; 80}; 81 82 83/** 84 * Primitive (point/line/tri) rasterization info 85 */ 86struct pipe_rasterizer_state 87{ 88 unsigned flatshade:1; 89 unsigned light_twoside:1; 90 unsigned front_winding:2; /**< PIPE_WINDING_x */ 91 unsigned cull_mode:2; /**< PIPE_WINDING_x */ 92 unsigned fill_cw:2; /**< PIPE_POLYGON_MODE_x */ 93 unsigned fill_ccw:2; /**< PIPE_POLYGON_MODE_x */ 94 unsigned offset_cw:1; 95 unsigned offset_ccw:1; 96 unsigned scissor:1; 97 unsigned poly_smooth:1; 98 unsigned poly_stipple_enable:1; 99 unsigned point_smooth:1; 100 unsigned point_sprite:1; 101 unsigned point_size_per_vertex:1; /**< size computed in vertex shader */ 102 unsigned multisample:1; /* XXX maybe more ms state in future */ 103 unsigned line_smooth:1; 104 unsigned line_stipple_enable:1; 105 unsigned line_stipple_factor:8; /**< [1..256] actually */ 106 unsigned line_stipple_pattern:16; 107 unsigned line_last_pixel:1; 108 109 /** 110 * Vertex coordinates are pre-transformed to screen space. Skip 111 * the vertex shader, clipping and viewport processing. Note that 112 * a vertex shader is still needed though, to indicate the mapping 113 * from vertex elements to fragment shader input semantics. 114 * 115 * XXX: considered for removal. 116 */ 117 unsigned bypass_vs_clip_and_viewport:1; 118 119 /** 120 * Use the first vertex of a primitive as the provoking vertex for 121 * flat shading. 122 */ 123 unsigned flatshade_first:1; 124 125 /** 126 * When true, triangle rasterization uses (0.5, 0.5) pixel centers 127 * for determining pixel ownership. 128 * 129 * When false, triangle rasterization uses (0,0) pixel centers for 130 * determining pixel ownership. 131 * 132 * Triangle rasterization always uses a 'top,left' rule for pixel 133 * ownership, this just alters which point we consider the pixel 134 * center for that test. 135 */ 136 unsigned gl_rasterization_rules:1; 137 138 float line_width; 139 float point_size; /**< used when no per-vertex size */ 140 float point_size_min; /* XXX - temporary, will go away */ 141 float point_size_max; /* XXX - temporary, will go away */ 142 float offset_units; 143 float offset_scale; 144 ubyte sprite_coord_mode[PIPE_MAX_SHADER_OUTPUTS]; /**< PIPE_SPRITE_COORD_ */ 145}; 146 147 148struct pipe_poly_stipple 149{ 150 unsigned stipple[32]; 151}; 152 153 154struct pipe_viewport_state 155{ 156 float scale[4]; 157 float translate[4]; 158}; 159 160 161struct pipe_scissor_state 162{ 163 unsigned minx:16; 164 unsigned miny:16; 165 unsigned maxx:16; 166 unsigned maxy:16; 167}; 168 169 170struct pipe_clip_state 171{ 172 float ucp[PIPE_MAX_CLIP_PLANES][4]; 173 unsigned nr; 174}; 175 176 177/** 178 * Constants for vertex/fragment shaders 179 */ 180struct pipe_constant_buffer 181{ 182 struct pipe_buffer *buffer; 183}; 184 185 186struct pipe_shader_state 187{ 188 const struct tgsi_token *tokens; 189}; 190 191 192struct pipe_depth_state 193{ 194 unsigned enabled:1; /**< depth test enabled? */ 195 unsigned writemask:1; /**< allow depth buffer writes? */ 196 unsigned func:3; /**< depth test func (PIPE_FUNC_x) */ 197}; 198 199 200struct pipe_stencil_state 201{ 202 unsigned enabled:1; /**< stencil[0]: stencil enabled, stencil[1]: two-side enabled */ 203 unsigned func:3; /**< PIPE_FUNC_x */ 204 unsigned fail_op:3; /**< PIPE_STENCIL_OP_x */ 205 unsigned zpass_op:3; /**< PIPE_STENCIL_OP_x */ 206 unsigned zfail_op:3; /**< PIPE_STENCIL_OP_x */ 207 ubyte ref_value; 208 ubyte valuemask; 209 ubyte writemask; 210}; 211 212 213struct pipe_alpha_state 214{ 215 unsigned enabled:1; 216 unsigned func:3; /**< PIPE_FUNC_x */ 217 float ref_value; /**< reference value */ 218}; 219 220 221struct pipe_depth_stencil_alpha_state 222{ 223 struct pipe_depth_state depth; 224 struct pipe_stencil_state stencil[2]; /**< [0] = front, [1] = back */ 225 struct pipe_alpha_state alpha; 226}; 227 228 229struct pipe_blend_state 230{ 231 unsigned blend_enable:1; 232 233 unsigned rgb_func:3; /**< PIPE_BLEND_x */ 234 unsigned rgb_src_factor:5; /**< PIPE_BLENDFACTOR_x */ 235 unsigned rgb_dst_factor:5; /**< PIPE_BLENDFACTOR_x */ 236 237 unsigned alpha_func:3; /**< PIPE_BLEND_x */ 238 unsigned alpha_src_factor:5; /**< PIPE_BLENDFACTOR_x */ 239 unsigned alpha_dst_factor:5; /**< PIPE_BLENDFACTOR_x */ 240 241 unsigned logicop_enable:1; 242 unsigned logicop_func:4; /**< PIPE_LOGICOP_x */ 243 244 unsigned colormask:4; /**< bitmask of PIPE_MASK_R/G/B/A */ 245 unsigned dither:1; 246}; 247 248 249struct pipe_blend_color 250{ 251 float color[4]; 252}; 253 254 255struct pipe_framebuffer_state 256{ 257 unsigned width, height; 258 259 /** multiple colorbuffers for multiple render targets */ 260 unsigned nr_cbufs; 261 struct pipe_surface *cbufs[PIPE_MAX_COLOR_BUFS]; 262 263 struct pipe_surface *zsbuf; /**< Z/stencil buffer */ 264}; 265 266 267/** 268 * Texture sampler state. 269 */ 270struct pipe_sampler_state 271{ 272 unsigned wrap_s:3; /**< PIPE_TEX_WRAP_x */ 273 unsigned wrap_t:3; /**< PIPE_TEX_WRAP_x */ 274 unsigned wrap_r:3; /**< PIPE_TEX_WRAP_x */ 275 unsigned min_img_filter:2; /**< PIPE_TEX_FILTER_x */ 276 unsigned min_mip_filter:2; /**< PIPE_TEX_MIPFILTER_x */ 277 unsigned mag_img_filter:2; /**< PIPE_TEX_FILTER_x */ 278 unsigned compare_mode:1; /**< PIPE_TEX_COMPARE_x */ 279 unsigned compare_func:3; /**< PIPE_FUNC_x */ 280 unsigned normalized_coords:1; /**< Are coords normalized to [0,1]? */ 281 unsigned prefilter:4; /**< Wierd sampling state exposed by some api's */ 282 float lod_bias; /**< LOD/lambda bias */ 283 float min_lod, max_lod; /**< LOD clamp range, after bias */ 284 float border_color[4]; 285 float max_anisotropy; 286}; 287 288 289/** 290 * 2D surface. This is basically a view into a memory buffer. 291 * May be a renderbuffer, texture mipmap level, etc. 292 */ 293struct pipe_surface 294{ 295 struct pipe_reference reference; 296 enum pipe_format format; /**< PIPE_FORMAT_x */ 297 unsigned width; /**< logical width in pixels */ 298 unsigned height; /**< logical height in pixels */ 299 unsigned layout; /**< PIPE_SURFACE_LAYOUT_x */ 300 unsigned offset; /**< offset from start of buffer, in bytes */ 301 unsigned usage; /**< PIPE_BUFFER_USAGE_* */ 302 303 unsigned zslice; 304 struct pipe_texture *texture; /**< texture into which this is a view */ 305 unsigned face; 306 unsigned level; 307}; 308 309 310/** 311 * Transfer object. For data transfer to/from a texture. 312 */ 313struct pipe_transfer 314{ 315 unsigned x; /**< x offset from start of texture image */ 316 unsigned y; /**< y offset from start of texture image */ 317 unsigned width; /**< logical width in pixels */ 318 unsigned height; /**< logical height in pixels */ 319 unsigned stride; /**< stride in bytes between rows of blocks */ 320 enum pipe_transfer_usage usage; /**< PIPE_TRANSFER_* */ 321 322 struct pipe_texture *texture; /**< texture to transfer to/from */ 323 unsigned face; 324 unsigned level; 325 unsigned zslice; 326}; 327 328 329/** 330 * Texture object. 331 */ 332struct pipe_texture 333{ 334 struct pipe_reference reference; 335 336 enum pipe_texture_target target; /**< PIPE_TEXTURE_x */ 337 enum pipe_format format; /**< PIPE_FORMAT_x */ 338 339 unsigned width0; 340 unsigned height0; 341 unsigned depth0; 342 343 unsigned last_level:8; /**< Index of last mipmap level present/defined */ 344 345 unsigned nr_samples:8; /**< for multisampled surfaces, nr of samples */ 346 347 unsigned tex_usage; /* PIPE_TEXTURE_USAGE_* */ 348 349 struct pipe_screen *screen; /**< screen that this texture belongs to */ 350}; 351 352 353/** 354 * A vertex buffer. Typically, all the vertex data/attributes for 355 * drawing something will be in one buffer. But it's also possible, for 356 * example, to put colors in one buffer and texcoords in another. 357 */ 358struct pipe_vertex_buffer 359{ 360 unsigned stride; /**< stride to same attrib in next vertex, in bytes */ 361 unsigned max_index; /**< number of vertices in this buffer */ 362 unsigned buffer_offset; /**< offset to start of data in buffer, in bytes */ 363 struct pipe_buffer *buffer; /**< the actual buffer */ 364}; 365 366 367/** 368 * Information to describe a vertex attribute (position, color, etc) 369 */ 370struct pipe_vertex_element 371{ 372 /** Offset of this attribute, in bytes, from the start of the vertex */ 373 unsigned src_offset; 374 375 /** Instance data rate divisor. 0 means this is per-vertex data, 376 * n means per-instance data used for n consecutive instances (n > 0). 377 */ 378 unsigned instance_divisor; 379 380 /** Which vertex_buffer (as given to pipe->set_vertex_buffer()) does 381 * this attribute live in? 382 */ 383 unsigned vertex_buffer_index:8; 384 unsigned nr_components:8; 385 386 enum pipe_format src_format; /**< PIPE_FORMAT_* */ 387}; 388 389 390/* Reference counting helper functions */ 391static INLINE void 392pipe_buffer_reference(struct pipe_buffer **ptr, struct pipe_buffer *buf) 393{ 394 struct pipe_buffer *old_buf = *ptr; 395 396 if (pipe_reference(&(*ptr)->reference, &buf->reference)) 397 old_buf->screen->buffer_destroy(old_buf); 398 *ptr = buf; 399} 400 401static INLINE void 402pipe_surface_reference(struct pipe_surface **ptr, struct pipe_surface *surf) 403{ 404 struct pipe_surface *old_surf = *ptr; 405 406 if (pipe_reference(&(*ptr)->reference, &surf->reference)) 407 old_surf->texture->screen->tex_surface_destroy(old_surf); 408 *ptr = surf; 409} 410 411static INLINE void 412pipe_texture_reference(struct pipe_texture **ptr, struct pipe_texture *tex) 413{ 414 struct pipe_texture *old_tex = *ptr; 415 416 if (pipe_reference(&(*ptr)->reference, &tex->reference)) 417 old_tex->screen->texture_destroy(old_tex); 418 *ptr = tex; 419} 420 421 422#ifdef __cplusplus 423} 424#endif 425 426#endif 427