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 #include "p_screen.h"
  47
  48
  49 #ifdef __cplusplus
  50 extern "C" {
  51 #endif
  52
  53
  54 /**
  55  * Implementation limits
  56  */
  57 #define PIPE_MAX_ATTRIBS          32
  58 #define PIPE_MAX_CLIP_PLANES       6
  59 #define PIPE_MAX_COLOR_BUFS        8
  60 #define PIPE_MAX_CONSTANT_BUFFERS 32
  61 #define PIPE_MAX_SAMPLERS         16
  62 #define PIPE_MAX_VERTEX_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 struct pipe_reference
  69 {
  70    int32_t count; /* atomic */
  71 };
  72
  73
  74 /**
  75  * The driver will certainly subclass this to include actual memory
  76  * management information.
  77  */
  78 struct pipe_buffer
  79 {
  80    struct pipe_reference  reference;
  81    unsigned               size;
  82    struct pipe_screen    *screen;
  83    unsigned               alignment;
  84    unsigned               usage;
  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 sprite_coord_enable:PIPE_MAX_SHADER_OUTPUTS;
 106    unsigned sprite_coord_mode:1;     /**< PIPE_SPRITE_COORD_ */
 107    unsigned point_quad_rasterization:1; /** points rasterized as quads or points */
 108    unsigned point_size_per_vertex:1; /**< size computed in vertex shader */
 109    unsigned multisample:1;         /* XXX maybe more ms state in future */
 110    unsigned line_smooth:1;
 111    unsigned line_stipple_enable:1;
 112    unsigned line_stipple_factor:8;  /**< [1..256] actually */
 113    unsigned line_stipple_pattern:16;
 114    unsigned line_last_pixel:1;
 115
 116    /**
 117     * Use the first vertex of a primitive as the provoking vertex for
 118     * flat shading.
 119     */
 120    unsigned flatshade_first:1;
 121
 122    /**
 123     * When true, triangle rasterization uses (0.5, 0.5) pixel centers
 124     * for determining pixel ownership.
 125     *
 126     * When false, triangle rasterization uses (0,0) pixel centers for
 127     * determining pixel ownership.
 128     *
 129     * Triangle rasterization always uses a 'top,left' rule for pixel
 130     * ownership, this just alters which point we consider the pixel
 131     * center for that test.
 132     */
 133    unsigned gl_rasterization_rules:1;
 134
 135    float line_width;
 136    float point_size;           /**< used when no per-vertex size */
 137    float offset_units;
 138    float offset_scale;
 139 };
 140
 141
 142 struct pipe_poly_stipple
 143 {
 144    unsigned stipple[32];
 145 };
 146
 147
 148 struct pipe_viewport_state
 149 {
 150    float scale[4];
 151    float translate[4];
 152 };
 153
 154
 155 struct pipe_scissor_state
 156 {
 157    unsigned minx:16;
 158    unsigned miny:16;
 159    unsigned maxx:16;
 160    unsigned maxy:16;
 161 };
 162
 163
 164 struct pipe_clip_state
 165 {
 166    float ucp[PIPE_MAX_CLIP_PLANES][4];
 167    unsigned nr;
 168 };
 169
 170
 171 struct pipe_shader_state
 172 {
 173    const struct tgsi_token *tokens;
 174 };
 175
 176
 177 struct pipe_depth_state
 178 {
 179    unsigned enabled:1;         /**< depth test enabled? */
 180    unsigned writemask:1;       /**< allow depth buffer writes? */
 181    unsigned func:3;            /**< depth test func (PIPE_FUNC_x) */
 182 };
 183
 184
 185 struct pipe_stencil_state
 186 {
 187    unsigned enabled:1;  /**< stencil[0]: stencil enabled, stencil[1]: two-side enabled */
 188    unsigned func:3;     /**< PIPE_FUNC_x */
 189    unsigned fail_op:3;  /**< PIPE_STENCIL_OP_x */
 190    unsigned zpass_op:3; /**< PIPE_STENCIL_OP_x */
 191    unsigned zfail_op:3; /**< PIPE_STENCIL_OP_x */
 192    unsigned valuemask:8;
 193    unsigned writemask:8;
 194 };
 195
 196
 197 struct pipe_alpha_state
 198 {
 199    unsigned enabled:1;
 200    unsigned func:3;     /**< PIPE_FUNC_x */
 201    float ref_value;     /**< reference value */
 202 };
 203
 204
 205 struct pipe_depth_stencil_alpha_state
 206 {
 207    struct pipe_depth_state depth;
 208    struct pipe_stencil_state stencil[2]; /**< [0] = front, [1] = back */
 209    struct pipe_alpha_state alpha;
 210 };
 211
 212
 213 struct pipe_rt_blend_state
 214 {
 215    unsigned blend_enable:1;
 216
 217    unsigned rgb_func:3;          /**< PIPE_BLEND_x */
 218    unsigned rgb_src_factor:5;    /**< PIPE_BLENDFACTOR_x */
 219    unsigned rgb_dst_factor:5;    /**< PIPE_BLENDFACTOR_x */
 220
 221    unsigned alpha_func:3;        /**< PIPE_BLEND_x */
 222    unsigned alpha_src_factor:5;  /**< PIPE_BLENDFACTOR_x */
 223    unsigned alpha_dst_factor:5;  /**< PIPE_BLENDFACTOR_x */
 224
 225    unsigned colormask:4;         /**< bitmask of PIPE_MASK_R/G/B/A */
 226 };
 227
 228 struct pipe_blend_state
 229 {
 230    unsigned independent_blend_enable:1;
 231    unsigned logicop_enable:1;
 232    unsigned logicop_func:4;      /**< PIPE_LOGICOP_x */
 233    unsigned dither:1;
 234    struct pipe_rt_blend_state rt[PIPE_MAX_COLOR_BUFS];
 235 };
 236
 237
 238 struct pipe_blend_color
 239 {
 240    float color[4];
 241 };
 242
 243 struct pipe_stencil_ref
 244 {
 245    ubyte ref_value[2];
 246 };
 247
 248 struct pipe_framebuffer_state
 249 {
 250    unsigned width, height;
 251
 252    /** multiple color buffers for multiple render targets */
 253    unsigned nr_cbufs;
 254    struct pipe_surface *cbufs[PIPE_MAX_COLOR_BUFS];
 255
 256    struct pipe_surface *zsbuf;      /**< Z/stencil buffer */
 257 };
 258
 259
 260 /**
 261  * Texture sampler state.
 262  */
 263 struct pipe_sampler_state
 264 {
 265    unsigned wrap_s:3;            /**< PIPE_TEX_WRAP_x */
 266    unsigned wrap_t:3;            /**< PIPE_TEX_WRAP_x */
 267    unsigned wrap_r:3;            /**< PIPE_TEX_WRAP_x */
 268    unsigned min_img_filter:2;    /**< PIPE_TEX_FILTER_x */
 269    unsigned min_mip_filter:2;    /**< PIPE_TEX_MIPFILTER_x */
 270    unsigned mag_img_filter:2;    /**< PIPE_TEX_FILTER_x */
 271    unsigned compare_mode:1;      /**< PIPE_TEX_COMPARE_x */
 272    unsigned compare_func:3;      /**< PIPE_FUNC_x */
 273    unsigned normalized_coords:1; /**< Are coords normalized to [0,1]? */
 274    unsigned max_anisotropy:6;
 275    float lod_bias;               /**< LOD/lambda bias */
 276    float min_lod, max_lod;       /**< LOD clamp range, after bias */
 277    float border_color[4];
 278 };
 279
 280
 281 /**
 282  * 2D surface.  This is basically a view into a memory buffer.
 283  * May be a renderbuffer, texture mipmap level, etc.
 284  */
 285 struct pipe_surface
 286 {
 287    struct pipe_reference reference;
 288    enum pipe_format format;
 289    unsigned width;               /**< logical width in pixels */
 290    unsigned height;              /**< logical height in pixels */
 291    unsigned layout;              /**< PIPE_SURFACE_LAYOUT_x */
 292    unsigned offset;              /**< offset from start of buffer, in bytes */
 293    unsigned usage;               /**< bitmask of PIPE_BUFFER_USAGE_x */
 294
 295    unsigned zslice;
 296    struct pipe_texture *texture; /**< texture into which this is a view  */
 297    unsigned face;
 298    unsigned level;
 299 };
 300
 301
 302 /**
 303  * Transfer object.  For data transfer to/from a texture.
 304  */
 305 struct pipe_transfer
 306 {
 307    unsigned x;                   /**< x offset from start of texture image */
 308    unsigned y;                   /**< y offset from start of texture image */
 309    unsigned width;               /**< logical width in pixels */
 310    unsigned height;              /**< logical height in pixels */
 311    unsigned stride;              /**< stride in bytes between rows of blocks */
 312    enum pipe_transfer_usage usage; /**< PIPE_TRANSFER_*  */
 313
 314    struct pipe_texture *texture; /**< texture to transfer to/from  */
 315    unsigned face;
 316    unsigned level;
 317    unsigned zslice;
 318 };
 319
 320
 321 /**
 322  * Texture object.
 323  */
 324 struct pipe_texture
 325 {
 326    struct pipe_reference reference;
 327
 328    enum pipe_texture_target target; /**< PIPE_TEXTURE_x */
 329    enum pipe_format format;         /**< PIPE_FORMAT_x */
 330
 331    unsigned width0;
 332    unsigned height0;
 333    unsigned depth0;
 334
 335    unsigned last_level:8;    /**< Index of last mipmap level present/defined */
 336
 337    unsigned nr_samples:8;    /**< for multisampled surfaces, nr of samples */
 338
 339    unsigned tex_usage;       /**< bitmask of PIPE_TEXTURE_USAGE_* */
 340
 341    struct pipe_screen *screen; /**< screen that this texture belongs to */
 342 };
 343
 344
 345 /**
 346  * A vertex buffer.  Typically, all the vertex data/attributes for
 347  * drawing something will be in one buffer.  But it's also possible, for
 348  * example, to put colors in one buffer and texcoords in another.
 349  */
 350 struct pipe_vertex_buffer
 351 {
 352    unsigned stride;    /**< stride to same attrib in next vertex, in bytes */
 353    unsigned max_index;   /**< number of vertices in this buffer */
 354    unsigned buffer_offset;  /**< offset to start of data in buffer, in bytes */
 355    struct pipe_buffer *buffer;  /**< the actual buffer */
 356 };
 357
 358
 359 /**
 360  * Information to describe a vertex attribute (position, color, etc)
 361  */
 362 struct pipe_vertex_element
 363 {
 364    /** Offset of this attribute, in bytes, from the start of the vertex */
 365    unsigned src_offset;
 366
 367    /** Instance data rate divisor. 0 means this is per-vertex data,
 368     *  n means per-instance data used for n consecutive instances (n > 0).
 369     */
 370    unsigned instance_divisor;
 371
 372    /** Which vertex_buffer (as given to pipe->set_vertex_buffer()) does
 373     * this attribute live in?
 374     */
 375    unsigned vertex_buffer_index:8;
 376
 377    enum pipe_format src_format;
 378 };
 379
 380
 381 #ifdef __cplusplus
 382 }
 383 #endif
 384
 385 #endif