src/gallium/include/pipe/p_state.h

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * All Rights Reserved.
   5  *
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   7  * copy of this software and associated documentation files (the
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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.
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  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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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       6
  58 #define PIPE_MAX_COLOR_BUFS        8
  59 #define PIPE_MAX_CONSTANT         32
  60 #define PIPE_MAX_SAMPLERS         16
  61 #define PIPE_MAX_SHADER_INPUTS    16
  62 #define PIPE_MAX_SHADER_OUTPUTS   16
  63 #define PIPE_MAX_TEXTURE_LEVELS   16
  64
  65
  66 /* fwd decls */
  67 struct pipe_screen;
  68 struct pipe_surface;
  69 struct pipe_winsys;
  70
  71
  72
  73 /**
  74  * The driver will certainly subclass this to include actual memory
  75  * management information.
  76  */
  77 struct pipe_buffer
  78 {
  79    unsigned alignment;
  80    unsigned usage;
  81    unsigned size;
  82
  83    /** Reference count */
  84    unsigned refcount;
  85 };
  86
  87
  88 /**
  89  * Primitive (point/line/tri) rasterization info
  90  */
  91 struct pipe_rasterizer_state
  92 {
  93    unsigned flatshade:1;
  94    unsigned light_twoside:1;
  95    unsigned front_winding:2;  /**< PIPE_WINDING_x */
  96    unsigned cull_mode:2;      /**< PIPE_WINDING_x */
  97    unsigned fill_cw:2;        /**< PIPE_POLYGON_MODE_x */
  98    unsigned fill_ccw:2;       /**< PIPE_POLYGON_MODE_x */
  99    unsigned offset_cw:1;
 100    unsigned offset_ccw:1;
 101    unsigned scissor:1;
 102    unsigned poly_smooth:1;
 103    unsigned poly_stipple_enable:1;
 104    unsigned point_smooth:1;
 105    unsigned point_sprite:1;
 106    unsigned point_size_per_vertex:1; /**< size computed in vertex shader */
 107    unsigned multisample:1;         /* XXX maybe more ms state in future */
 108    unsigned line_smooth:1;
 109    unsigned line_stipple_enable:1;
 110    unsigned line_stipple_factor:8;  /**< [1..256] actually */
 111    unsigned line_stipple_pattern:16;
 112    unsigned line_last_pixel:1;
 113    unsigned bypass_clipping:1;
 114    unsigned bypass_vs:1; /**< Skip the vertex shader.  Note that the shader is
 115                             still needed though, to indicate inputs/outputs */
 116    unsigned origin_lower_left:1;  /**< Is (0,0) the lower-left corner? */
 117    unsigned flatshade_first:1;   /**< take color attribute from the first vertex of a primitive */
 118    unsigned gl_rasterization_rules:1; /**< enable tweaks for GL rasterization?  */
 119
 120    float line_width;
 121    float point_size;           /**< used when no per-vertex size */
 122    float point_size_min;        /* XXX - temporary, will go away */
 123    float point_size_max;        /* XXX - temporary, will go away */
 124    float offset_units;
 125    float offset_scale;
 126    ubyte sprite_coord_mode[PIPE_MAX_SHADER_OUTPUTS]; /**< PIPE_SPRITE_COORD_ */
 127 };
 128
 129
 130 struct pipe_poly_stipple
 131 {
 132    unsigned stipple[32];
 133 };
 134
 135
 136 struct pipe_viewport_state
 137 {
 138    float scale[4];
 139    float translate[4];
 140 };
 141
 142
 143 struct pipe_scissor_state
 144 {
 145    unsigned minx:16;
 146    unsigned miny:16;
 147    unsigned maxx:16;
 148    unsigned maxy:16;
 149 };
 150
 151
 152 struct pipe_clip_state
 153 {
 154    float ucp[PIPE_MAX_CLIP_PLANES][4];
 155    unsigned nr;
 156 };
 157
 158
 159 /**
 160  * Constants for vertex/fragment shaders
 161  */
 162 struct pipe_constant_buffer
 163 {
 164    struct pipe_buffer *buffer;
 165    unsigned size;    /** in bytes (XXX: redundant!) */
 166 };
 167
 168
 169 struct pipe_shader_state
 170 {
 171    const struct tgsi_token *tokens;
 172 };
 173
 174
 175 struct pipe_depth_state {
 176    unsigned enabled:1;         /**< depth test enabled? */
 177    unsigned writemask:1;       /**< allow depth buffer writes? */
 178    unsigned func:3;            /**< depth test func (PIPE_FUNC_x) */
 179    unsigned occlusion_count:1; /**< do occlusion counting? */
 180 };
 181
 182
 183 struct pipe_stencil_state {
 184    unsigned enabled:1;  /**< stencil[0]: stencil enabled, stencil[1]: two-side enabled */
 185    unsigned func:3;     /**< PIPE_FUNC_x */
 186    unsigned fail_op:3;  /**< PIPE_STENCIL_OP_x */
 187    unsigned zpass_op:3; /**< PIPE_STENCIL_OP_x */
 188    unsigned zfail_op:3; /**< PIPE_STENCIL_OP_x */
 189    ubyte ref_value;
 190    ubyte value_mask;
 191    ubyte write_mask;
 192 };
 193
 194
 195 struct pipe_alpha_state {
 196    unsigned enabled:1;
 197    unsigned func:3;     /**< PIPE_FUNC_x */
 198    float ref;           /**< reference value */
 199 };
 200
 201
 202 struct pipe_depth_stencil_alpha_state
 203 {
 204    struct pipe_depth_state depth;
 205    struct pipe_stencil_state stencil[2]; /**< [0] = front, [1] = back */
 206    struct pipe_alpha_state alpha;
 207 };
 208
 209
 210 struct pipe_blend_state
 211 {
 212    unsigned blend_enable:1;
 213
 214    unsigned rgb_func:3;          /**< PIPE_BLEND_x */
 215    unsigned rgb_src_factor:5;    /**< PIPE_BLENDFACTOR_x */
 216    unsigned rgb_dst_factor:5;    /**< PIPE_BLENDFACTOR_x */
 217
 218    unsigned alpha_func:3;        /**< PIPE_BLEND_x */
 219    unsigned alpha_src_factor:5;  /**< PIPE_BLENDFACTOR_x */
 220    unsigned alpha_dst_factor:5;  /**< PIPE_BLENDFACTOR_x */
 221
 222    unsigned logicop_enable:1;
 223    unsigned logicop_func:4;      /**< PIPE_LOGICOP_x */
 224
 225    unsigned colormask:4;         /**< bitmask of PIPE_MASK_R/G/B/A */
 226    unsigned dither:1;
 227 };
 228
 229
 230 struct pipe_blend_color
 231 {
 232    float color[4];
 233 };
 234
 235
 236 struct pipe_framebuffer_state
 237 {
 238    unsigned width, height;
 239
 240    /** multiple colorbuffers for multiple render targets */
 241    unsigned num_cbufs;
 242    struct pipe_surface *cbufs[PIPE_MAX_COLOR_BUFS];
 243
 244    struct pipe_surface *zsbuf;      /**< Z/stencil buffer */
 245 };
 246
 247
 248 /**
 249  * Texture sampler state.
 250  */
 251 struct pipe_sampler_state
 252 {
 253    unsigned wrap_s:3;            /**< PIPE_TEX_WRAP_x */
 254    unsigned wrap_t:3;            /**< PIPE_TEX_WRAP_x */
 255    unsigned wrap_r:3;            /**< PIPE_TEX_WRAP_x */
 256    unsigned min_img_filter:2;    /**< PIPE_TEX_FILTER_x */
 257    unsigned min_mip_filter:2;    /**< PIPE_TEX_MIPFILTER_x */
 258    unsigned mag_img_filter:2;    /**< PIPE_TEX_FILTER_x */
 259    unsigned compare_mode:1;      /**< PIPE_TEX_COMPARE_x */
 260    unsigned compare_func:3;      /**< PIPE_FUNC_x */
 261    unsigned normalized_coords:1; /**< Are coords normalized to [0,1]? */
 262    unsigned prefilter:4;         /**< Wierd sampling state exposed by some api's */
 263    float shadow_ambient;         /**< shadow test fail color/intensity */
 264    float lod_bias;               /**< LOD/lambda bias */
 265    float min_lod, max_lod;       /**< LOD clamp range, after bias */
 266    float border_color[4];
 267    float max_anisotropy;
 268 };
 269
 270
 271 /**
 272  * 2D surface.  This is basically a view into a memory buffer.
 273  * May be a renderbuffer, texture mipmap level, etc.
 274  */
 275 struct pipe_surface
 276 {
 277    struct pipe_buffer *buffer;   /**< surface's buffer/memory */
 278    enum pipe_format format;      /**< PIPE_FORMAT_x */
 279    unsigned status;              /**< PIPE_SURFACE_STATUS_x */
 280    unsigned clear_value;         /**< XXX may be temporary */
 281    unsigned width;               /**< logical width in pixels */
 282    unsigned height;              /**< logical height in pixels */
 283    struct pipe_format_block block;
 284    unsigned nblocksx;            /**< allocated width in blocks */
 285    unsigned nblocksy;            /**< allocated height in blocks */
 286    unsigned stride;              /**< stride in bytes between rows of blocks */
 287    unsigned layout;              /**< PIPE_SURFACE_LAYOUT_x */
 288    unsigned offset;              /**< offset from start of buffer, in bytes */
 289    unsigned refcount;
 290    unsigned usage;               /**< PIPE_BUFFER_USAGE_*  */
 291
 292    struct pipe_winsys *winsys;   /**< winsys which owns/created the surface */
 293
 294    struct pipe_texture *texture; /**< optional texture into which this is a view  */
 295    unsigned face;
 296    unsigned level;
 297    unsigned zslice;
 298 };
 299
 300
 301 /**
 302  * Texture object.
 303  */
 304 struct pipe_texture
 305 {
 306    enum pipe_texture_target target; /**< PIPE_TEXTURE_x */
 307    enum pipe_format format;         /**< PIPE_FORMAT_x */
 308
 309    unsigned width[PIPE_MAX_TEXTURE_LEVELS];
 310    unsigned height[PIPE_MAX_TEXTURE_LEVELS];
 311    unsigned depth[PIPE_MAX_TEXTURE_LEVELS];
 312
 313    struct pipe_format_block block;
 314    unsigned nblocksx[PIPE_MAX_TEXTURE_LEVELS]; /**< allocated width in blocks */
 315    unsigned nblocksy[PIPE_MAX_TEXTURE_LEVELS]; /**< allocated height in blocks */
 316
 317    unsigned last_level:8;    /**< Index of last mipmap level present/defined */
 318    unsigned compressed:1;
 319
 320    unsigned nr_samples:8;          /**< for multisampled surfaces, nr of samples */
 321
 322    unsigned tex_usage;          /* PIPE_TEXTURE_USAGE_* */
 323
 324    /* These are also refcounted:
 325     */
 326    unsigned refcount;
 327
 328    struct pipe_screen *screen; /**< screen that this texture belongs to */
 329 };
 330
 331
 332 /**
 333  * A vertex buffer.  Typically, all the vertex data/attributes for
 334  * drawing something will be in one buffer.  But it's also possible, for
 335  * example, to put colors in one buffer and texcoords in another.
 336  */
 337 struct pipe_vertex_buffer
 338 {
 339    unsigned pitch;    /**< stride to same attrib in next vertex, in bytes */
 340    unsigned max_index;   /**< number of vertices in this buffer */
 341    unsigned buffer_offset;  /**< offset to start of data in buffer, in bytes */
 342    struct pipe_buffer *buffer;  /**< the actual buffer */
 343 };
 344
 345
 346 /**
 347  * Information to describe a vertex attribute (position, color, etc)
 348  */
 349 struct pipe_vertex_element
 350 {
 351    /** Offset of this attribute, in bytes, from the start of the vertex */
 352    unsigned src_offset;
 353
 354    /** Which vertex_buffer (as given to pipe->set_vertex_buffer()) does
 355     * this attribute live in?
 356     */
 357    unsigned vertex_buffer_index:8;
 358    unsigned nr_components:8;
 359
 360    enum pipe_format src_format;            /**< PIPE_FORMAT_* */
 361 };
 362
 363
 364 #ifdef __cplusplus
 365 }
 366 #endif
 367
 368 #endif