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,
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  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,
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  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28
  29 /**
  30  * Abstract graphics pipe state objects.
  31  *
  32  * Basic notes:
  33  *   1. Want compact representations, so we use bitfields.
  34  *   2. Put bitfields before other (GLfloat) fields.
  35  */
  36
  37
  38 #ifndef PIPE_STATE_H
  39 #define PIPE_STATE_H
  40
  41 #include "p_compiler.h"
  42 #include "p_defines.h"
  43 #include "p_format.h"
  44
  45
  46 #ifdef __cplusplus
  47 extern "C" {
  48 #endif
  49
  50
  51 /**
  52  * Implementation limits
  53  */
  54 #define PIPE_MAX_ATTRIBS          32
  55 #define PIPE_MAX_CLIP_PLANES       6
  56 #define PIPE_MAX_COLOR_BUFS        8
  57 #define PIPE_MAX_CONSTANT         32
  58 #define PIPE_MAX_SAMPLERS         16
  59 #define PIPE_MAX_SHADER_INPUTS    16
  60 #define PIPE_MAX_SHADER_OUTPUTS   16
  61 #define PIPE_MAX_TEXTURE_LEVELS   16
  62
  63
  64 /* fwd decls */
  65 struct pipe_screen;
  66 struct pipe_surface;
  67 struct pipe_winsys;
  68
  69
  70
  71 /**
  72  * The driver will certainly subclass this to include actual memory
  73  * management information.
  74  */
  75 struct pipe_buffer
  76 {
  77    unsigned alignment;
  78    unsigned usage;
  79    unsigned size;
  80
  81    /** Reference count */
  82    unsigned refcount;
  83 };
  84
  85
  86 /**
  87  * Primitive (point/line/tri) rasterization info
  88  */
  89 struct 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    unsigned bypass_clipping:1;
 112    unsigned bypass_vs:1; /**< Skip the vertex shader.  Note that the shader is
 113                             still needed though, to indicate inputs/outputs */
 114    unsigned origin_lower_left:1;  /**< Is (0,0) the lower-left corner? */
 115    unsigned flatshade_first:1;   /**< take color attribute from the first vertex of a primitive */
 116    unsigned gl_rasterization_rules:1; /**< enable tweaks for GL rasterization?  */
 117
 118    float line_width;
 119    float point_size;           /**< used when no per-vertex size */
 120    float point_size_min;        /* XXX - temporary, will go away */
 121    float point_size_max;        /* XXX - temporary, will go away */
 122    float offset_units;
 123    float offset_scale;
 124    ubyte sprite_coord_mode[PIPE_MAX_SHADER_OUTPUTS]; /**< PIPE_SPRITE_COORD_ */
 125 };
 126
 127
 128 struct pipe_poly_stipple
 129 {
 130    unsigned stipple[32];
 131 };
 132
 133
 134 struct pipe_viewport_state
 135 {
 136    float scale[4];
 137    float translate[4];
 138 };
 139
 140
 141 struct pipe_scissor_state
 142 {
 143    unsigned minx:16;
 144    unsigned miny:16;
 145    unsigned maxx:16;
 146    unsigned maxy:16;
 147 };
 148
 149
 150 struct pipe_clip_state
 151 {
 152    float ucp[PIPE_MAX_CLIP_PLANES][4];
 153    unsigned nr;
 154 };
 155
 156
 157 /**
 158  * Constants for vertex/fragment shaders
 159  */
 160 struct pipe_constant_buffer
 161 {
 162    struct pipe_buffer *buffer;
 163    unsigned size;    /** in bytes (XXX: redundant!) */
 164 };
 165
 166
 167 struct pipe_shader_state
 168 {
 169    const struct tgsi_token *tokens;
 170 };
 171
 172
 173 struct pipe_depth_state {
 174    unsigned enabled:1;         /**< depth test enabled? */
 175    unsigned writemask:1;       /**< allow depth buffer writes? */
 176    unsigned func:3;            /**< depth test func (PIPE_FUNC_x) */
 177    unsigned occlusion_count:1; /**< do occlusion counting? */
 178 };
 179
 180
 181 struct pipe_stencil_state {
 182    unsigned enabled:1;  /**< stencil[0]: stencil enabled, stencil[1]: two-side enabled */
 183    unsigned func:3;     /**< PIPE_FUNC_x */
 184    unsigned fail_op:3;  /**< PIPE_STENCIL_OP_x */
 185    unsigned zpass_op:3; /**< PIPE_STENCIL_OP_x */
 186    unsigned zfail_op:3; /**< PIPE_STENCIL_OP_x */
 187    ubyte ref_value;
 188    ubyte value_mask;
 189    ubyte write_mask;
 190 };
 191
 192
 193 struct pipe_alpha_state {
 194    unsigned enabled:1;
 195    unsigned func:3;     /**< PIPE_FUNC_x */
 196    float ref;           /**< reference value */
 197 };
 198
 199
 200 struct pipe_depth_stencil_alpha_state
 201 {
 202    struct pipe_depth_state depth;
 203    struct pipe_stencil_state stencil[2]; /**< [0] = front, [1] = back */
 204    struct pipe_alpha_state alpha;
 205 };
 206
 207
 208 struct pipe_blend_state
 209 {
 210    unsigned blend_enable:1;
 211
 212    unsigned rgb_func:3;          /**< PIPE_BLEND_x */
 213    unsigned rgb_src_factor:5;    /**< PIPE_BLENDFACTOR_x */
 214    unsigned rgb_dst_factor:5;    /**< PIPE_BLENDFACTOR_x */
 215
 216    unsigned alpha_func:3;        /**< PIPE_BLEND_x */
 217    unsigned alpha_src_factor:5;  /**< PIPE_BLENDFACTOR_x */
 218    unsigned alpha_dst_factor:5;  /**< PIPE_BLENDFACTOR_x */
 219
 220    unsigned logicop_enable:1;
 221    unsigned logicop_func:4;      /**< PIPE_LOGICOP_x */
 222
 223    unsigned colormask:4;         /**< bitmask of PIPE_MASK_R/G/B/A */
 224    unsigned dither:1;
 225 };
 226
 227
 228 struct pipe_blend_color
 229 {
 230    float color[4];
 231 };
 232
 233
 234 struct pipe_framebuffer_state
 235 {
 236    unsigned width, height;
 237
 238    /** multiple colorbuffers for multiple render targets */
 239    unsigned num_cbufs;
 240    struct pipe_surface *cbufs[PIPE_MAX_COLOR_BUFS];
 241
 242    struct pipe_surface *zsbuf;      /**< Z/stencil buffer */
 243 };
 244
 245
 246 /**
 247  * Texture sampler state.
 248  */
 249 struct pipe_sampler_state
 250 {
 251    unsigned wrap_s:3;            /**< PIPE_TEX_WRAP_x */
 252    unsigned wrap_t:3;            /**< PIPE_TEX_WRAP_x */
 253    unsigned wrap_r:3;            /**< PIPE_TEX_WRAP_x */
 254    unsigned min_img_filter:2;    /**< PIPE_TEX_FILTER_x */
 255    unsigned min_mip_filter:2;    /**< PIPE_TEX_MIPFILTER_x */
 256    unsigned mag_img_filter:2;    /**< PIPE_TEX_FILTER_x */
 257    unsigned compare_mode:1;      /**< PIPE_TEX_COMPARE_x */
 258    unsigned compare_func:3;      /**< PIPE_FUNC_x */
 259    unsigned normalized_coords:1; /**< Are coords normalized to [0,1]? */
 260    unsigned prefilter:4;         /**< Wierd sampling state exposed by some api's */
 261    float shadow_ambient;         /**< shadow test fail color/intensity */
 262    float lod_bias;               /**< LOD/lambda bias */
 263    float min_lod, max_lod;       /**< LOD clamp range, after bias */
 264    float border_color[4];
 265    float max_anisotropy;
 266 };
 267
 268
 269 /**
 270  * 2D surface.  This is basically a view into a memory buffer.
 271  * May be a renderbuffer, texture mipmap level, etc.
 272  */
 273 struct pipe_surface
 274 {
 275    struct pipe_buffer *buffer;   /**< surface's buffer/memory */
 276    enum pipe_format format;      /**< PIPE_FORMAT_x */
 277    unsigned status;              /**< PIPE_SURFACE_STATUS_x */
 278    unsigned clear_value;         /**< XXX may be temporary */
 279    unsigned width;               /**< logical width in pixels */
 280    unsigned height;              /**< logical height in pixels */
 281    struct pipe_format_block block;
 282    unsigned nblocksx;            /**< allocated width in blocks */
 283    unsigned nblocksy;            /**< allocated height in blocks */
 284    unsigned stride;              /**< stride in bytes between rows of blocks */
 285    unsigned layout;              /**< PIPE_SURFACE_LAYOUT_x */
 286    unsigned offset;              /**< offset from start of buffer, in bytes */
 287    unsigned refcount;
 288    unsigned usage;               /**< PIPE_BUFFER_USAGE_*  */
 289
 290    struct pipe_winsys *winsys;   /**< winsys which owns/created the surface */
 291
 292    struct pipe_texture *texture; /**< optional texture into which this is a view  */
 293    unsigned face;
 294    unsigned level;
 295    unsigned zslice;
 296 };
 297
 298
 299 /**
 300  * Texture object.
 301  */
 302 struct pipe_texture
 303 {
 304    enum pipe_texture_target target; /**< PIPE_TEXTURE_x */
 305    enum pipe_format format;         /**< PIPE_FORMAT_x */
 306
 307    unsigned width[PIPE_MAX_TEXTURE_LEVELS];
 308    unsigned height[PIPE_MAX_TEXTURE_LEVELS];
 309    unsigned depth[PIPE_MAX_TEXTURE_LEVELS];
 310
 311    struct pipe_format_block block;
 312    unsigned nblocksx[PIPE_MAX_TEXTURE_LEVELS]; /**< allocated width in blocks */
 313    unsigned nblocksy[PIPE_MAX_TEXTURE_LEVELS]; /**< allocated height in blocks */
 314
 315    unsigned last_level:8;    /**< Index of last mipmap level present/defined */
 316    unsigned compressed:1;
 317
 318    unsigned nr_samples:8;          /**< for multisampled surfaces, nr of samples */
 319
 320    unsigned tex_usage;          /* PIPE_TEXTURE_USAGE_* */
 321
 322    /* These are also refcounted:
 323     */
 324    unsigned refcount;
 325
 326    struct pipe_screen *screen; /**< screen that this texture belongs to */
 327 };
 328
 329
 330 /**
 331  * A vertex buffer.  Typically, all the vertex data/attributes for
 332  * drawing something will be in one buffer.  But it's also possible, for
 333  * example, to put colors in one buffer and texcoords in another.
 334  */
 335 struct pipe_vertex_buffer
 336 {
 337    unsigned pitch;    /**< stride to same attrib in next vertex, in bytes */
 338    unsigned max_index;   /**< number of vertices in this buffer */
 339    unsigned buffer_offset;  /**< offset to start of data in buffer, in bytes */
 340    struct pipe_buffer *buffer;  /**< the actual buffer */
 341 };
 342
 343
 344 /**
 345  * Information to describe a vertex attribute (position, color, etc)
 346  */
 347 struct pipe_vertex_element
 348 {
 349    /** Offset of this attribute, in bytes, from the start of the vertex */
 350    unsigned src_offset;
 351
 352    /** Which vertex_buffer (as given to pipe->set_vertex_buffer()) does
 353     * this attribute live in?
 354     */
 355    unsigned vertex_buffer_index:8;
 356    unsigned nr_components:8;
 357
 358    enum pipe_format src_format;            /**< PIPE_FORMAT_* */
 359 };
 360
 361
 362 #ifdef __cplusplus
 363 }
 364 #endif
 365
 366 #endif