src/gallium/auxiliary/util/u_blitter.h

   1 /**************************************************************************
   2  *
   3  * Copyright 2009 Marek Olšák <maraeo@gmail.com>
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the
   7  * "Software"), to deal in the Software without restriction, including
   8  * without limitation the rights to use, copy, modify, merge, publish,
   9  * distribute, sub license, and/or sell copies of the Software, and to
  10  * permit persons to whom the Software is furnished to do so, subject to
  11  * the following conditions:
  12  *
  13  * The above copyright notice and this permission notice (including the
  14  * next paragraph) shall be included in all copies or substantial portions
  15  * of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  19  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  20  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  21  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  22  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  23  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  24  *
  25  **************************************************************************/
  26
  27 #ifndef U_BLITTER_H
  28 #define U_BLITTER_H
  29
  30 #include "util/u_framebuffer.h"
  31 #include "util/u_inlines.h"
  32 #include "util/u_memory.h"
  33
  34 #include "pipe/p_state.h"
  35
  36
  37 #ifdef __cplusplus
  38 extern "C" {
  39 #endif
  40
  41 struct pipe_context;
  42
  43 enum blitter_attrib_type {
  44    UTIL_BLITTER_ATTRIB_NONE,
  45    UTIL_BLITTER_ATTRIB_COLOR,
  46    UTIL_BLITTER_ATTRIB_TEXCOORD
  47 };
  48
  49 struct blitter_context
  50 {
  51    /**
  52     * Draw a rectangle.
  53     *
  54     * \param x1      An X coordinate of the top-left corner.
  55     * \param y1      A Y coordinate of the top-left corner.
  56     * \param x2      An X coordinate of the bottom-right corner.
  57     * \param y2      A Y coordinate of the bottom-right corner.
  58     * \param depth   A depth which the rectangle is rendered at.
  59     *
  60     * \param type   Semantics of the attributes "attrib".
  61     *               If type is UTIL_BLITTER_ATTRIB_NONE, ignore them.
  62     *               If type is UTIL_BLITTER_ATTRIB_COLOR, the attributes
  63     *               make up a constant RGBA color, and should go
  64     *               to the GENERIC0 varying slot of a fragment shader.
  65     *               If type is UTIL_BLITTER_ATTRIB_TEXCOORD, {a1, a2} and
  66     *               {a3, a4} specify top-left and bottom-right texture
  67     *               coordinates of the rectangle, respectively, and should go
  68     *               to the GENERIC0 varying slot of a fragment shader.
  69     *
  70     * \param attrib See type.
  71     *
  72     * \note A driver may optionally override this callback to implement
  73     *       a specialized hardware path for drawing a rectangle, e.g. using
  74     *       a rectangular point sprite.
  75     */
  76    void (*draw_rectangle)(struct blitter_context *blitter,
  77                           unsigned x1, unsigned y1, unsigned x2, unsigned y2,
  78                           float depth,
  79                           enum blitter_attrib_type type,
  80                           const float attrib[4]);
  81
  82    /* Private members, really. */
  83    struct pipe_context *pipe; /**< pipe context */
  84
  85    void *saved_blend_state;   /**< blend state */
  86    void *saved_dsa_state;     /**< depth stencil alpha state */
  87    void *saved_velem_state;   /**< vertex elements state */
  88    void *saved_rs_state;      /**< rasterizer state */
  89    void *saved_fs, *saved_vs; /**< fragment shader, vertex shader */
  90
  91    struct pipe_framebuffer_state saved_fb_state;  /**< framebuffer state */
  92    struct pipe_stencil_ref saved_stencil_ref;     /**< stencil ref */
  93    struct pipe_viewport_state saved_viewport;
  94    struct pipe_clip_state saved_clip;
  95
  96    int saved_num_sampler_states;
  97    void *saved_sampler_states[PIPE_MAX_SAMPLERS];
  98
  99    int saved_num_sampler_views;
 100    struct pipe_sampler_view *saved_sampler_views[PIPE_MAX_SAMPLERS];
 101
 102    int saved_num_vertex_buffers;
 103    struct pipe_vertex_buffer saved_vertex_buffers[PIPE_MAX_ATTRIBS];
 104 };
 105
 106 /**
 107  * Create a blitter context.
 108  */
 109 struct blitter_context *util_blitter_create(struct pipe_context *pipe);
 110
 111 /**
 112  * Destroy a blitter context.
 113  */
 114 void util_blitter_destroy(struct blitter_context *blitter);
 115
 116 /**
 117  * Return the pipe context associated with a blitter context.
 118  */
 119 static INLINE
 120 struct pipe_context *util_blitter_get_pipe(struct blitter_context *blitter)
 121 {
 122    return blitter->pipe;
 123 }
 124
 125 /*
 126  * These CSOs must be saved before any of the following functions is called:
 127  * - blend state
 128  * - depth stencil alpha state
 129  * - rasterizer state
 130  * - vertex shader
 131  * - fragment shader
 132  */
 133
 134 /**
 135  * Clear a specified set of currently bound buffers to specified values.
 136  */
 137 void util_blitter_clear(struct blitter_context *blitter,
 138                         unsigned width, unsigned height,
 139                         unsigned num_cbufs,
 140                         unsigned clear_buffers,
 141                         const float *rgba,
 142                         double depth, unsigned stencil);
 143
 144 void util_blitter_clear_depth_custom(struct blitter_context *blitter,
 145                                      unsigned width, unsigned height,
 146                                      double depth, void *custom_dsa);
 147
 148 /**
 149  * Copy a block of pixels from one surface to another.
 150  *
 151  * You can copy from any color format to any other color format provided
 152  * the former can be sampled and the latter can be rendered to. Otherwise,
 153  * a software fallback path is taken and both surfaces must be of the same
 154  * format.
 155  *
 156  * The same holds for depth-stencil formats with the exception that stencil
 157  * cannot be copied unless you set ignore_stencil to FALSE. In that case,
 158  * a software fallback path is taken and both surfaces must be of the same
 159  * format.
 160  *
 161  * Use pipe_screen->is_format_supported to know your options.
 162  *
 163  * These states must be saved in the blitter in addition to the state objects
 164  * already required to be saved:
 165  * - framebuffer state
 166  * - fragment sampler states
 167  * - fragment sampler textures
 168  */
 169 void util_blitter_copy_region(struct blitter_context *blitter,
 170                               struct pipe_resource *dst,
 171                               unsigned dstlevel,
 172                               unsigned dstx, unsigned dsty, unsigned dstz,
 173                               struct pipe_resource *src,
 174                               unsigned srclevel,
 175                               const struct pipe_box *srcbox,
 176                               boolean ignore_stencil);
 177
 178 /**
 179  * Clear a region of a (color) surface to a constant value.
 180  *
 181  * These states must be saved in the blitter in addition to the state objects
 182  * already required to be saved:
 183  * - framebuffer state
 184  */
 185 void util_blitter_clear_render_target(struct blitter_context *blitter,
 186                                       struct pipe_surface *dst,
 187                                       const float *rgba,
 188                                       unsigned dstx, unsigned dsty,
 189                                       unsigned width, unsigned height);
 190
 191 /**
 192  * Clear a region of a depth-stencil surface, both stencil and depth
 193  * or only one of them if this is a combined depth-stencil surface.
 194  *
 195  * These states must be saved in the blitter in addition to the state objects
 196  * already required to be saved:
 197  * - framebuffer state
 198  */
 199 void util_blitter_clear_depth_stencil(struct blitter_context *blitter,
 200                                       struct pipe_surface *dst,
 201                                       unsigned clear_flags,
 202                                       double depth,
 203                                       unsigned stencil,
 204                                       unsigned dstx, unsigned dsty,
 205                                       unsigned width, unsigned height);
 206
 207 void util_blitter_custom_depth_stencil(struct blitter_context *blitter,
 208                                        struct pipe_surface *zsurf,
 209                                        struct pipe_surface *cbsurf,
 210                                        void *dsa_stage, float depth);
 211
 212 /* The functions below should be used to save currently bound constant state
 213  * objects inside a driver. The objects are automatically restored at the end
 214  * of the util_blitter_{clear, copy_region, fill_region} functions and then
 215  * forgotten.
 216  *
 217  * CSOs not listed here are not affected by util_blitter. */
 218
 219 static INLINE
 220 void util_blitter_save_blend(struct blitter_context *blitter,
 221                              void *state)
 222 {
 223    blitter->saved_blend_state = state;
 224 }
 225
 226 static INLINE
 227 void util_blitter_save_depth_stencil_alpha(struct blitter_context *blitter,
 228                                            void *state)
 229 {
 230    blitter->saved_dsa_state = state;
 231 }
 232
 233 static INLINE
 234 void util_blitter_save_vertex_elements(struct blitter_context *blitter,
 235                                        void *state)
 236 {
 237    blitter->saved_velem_state = state;
 238 }
 239
 240 static INLINE
 241 void util_blitter_save_stencil_ref(struct blitter_context *blitter,
 242                                    const struct pipe_stencil_ref *state)
 243 {
 244    blitter->saved_stencil_ref = *state;
 245 }
 246
 247 static INLINE
 248 void util_blitter_save_rasterizer(struct blitter_context *blitter,
 249                                   void *state)
 250 {
 251    blitter->saved_rs_state = state;
 252 }
 253
 254 static INLINE
 255 void util_blitter_save_fragment_shader(struct blitter_context *blitter,
 256                                        void *fs)
 257 {
 258    blitter->saved_fs = fs;
 259 }
 260
 261 static INLINE
 262 void util_blitter_save_vertex_shader(struct blitter_context *blitter,
 263                                      void *vs)
 264 {
 265    blitter->saved_vs = vs;
 266 }
 267
 268 static INLINE
 269 void util_blitter_save_framebuffer(struct blitter_context *blitter,
 270                                    const struct pipe_framebuffer_state *state)
 271 {
 272    blitter->saved_fb_state.nr_cbufs = 0; /* It's ~0 now, meaning it's unsaved. */
 273    util_copy_framebuffer_state(&blitter->saved_fb_state, state);
 274 }
 275
 276 static INLINE
 277 void util_blitter_save_viewport(struct blitter_context *blitter,
 278                                 struct pipe_viewport_state *state)
 279 {
 280    blitter->saved_viewport = *state;
 281 }
 282
 283 static INLINE
 284 void util_blitter_save_clip(struct blitter_context *blitter,
 285                             struct pipe_clip_state *state)
 286 {
 287    blitter->saved_clip = *state;
 288 }
 289
 290 static INLINE
 291 void util_blitter_save_fragment_sampler_states(
 292                   struct blitter_context *blitter,
 293                   int num_sampler_states,
 294                   void **sampler_states)
 295 {
 296    assert(num_sampler_states <= Elements(blitter->saved_sampler_states));
 297
 298    blitter->saved_num_sampler_states = num_sampler_states;
 299    memcpy(blitter->saved_sampler_states, sampler_states,
 300           num_sampler_states * sizeof(void *));
 301 }
 302
 303 static INLINE void
 304 util_blitter_save_fragment_sampler_views(struct blitter_context *blitter,
 305                                          int num_views,
 306                                          struct pipe_sampler_view **views)
 307 {
 308    unsigned i;
 309    assert(num_views <= Elements(blitter->saved_sampler_views));
 310
 311    blitter->saved_num_sampler_views = num_views;
 312    for (i = 0; i < num_views; i++)
 313       pipe_sampler_view_reference(&blitter->saved_sampler_views[i],
 314                                   views[i]);
 315 }
 316
 317 static INLINE void
 318 util_blitter_save_vertex_buffers(struct blitter_context *blitter,
 319                                          int num_vertex_buffers,
 320                                          struct pipe_vertex_buffer *vertex_buffers)
 321 {
 322    assert(num_vertex_buffers <= Elements(blitter->saved_vertex_buffers));
 323
 324    blitter->saved_num_vertex_buffers = 0;
 325    util_copy_vertex_buffers(blitter->saved_vertex_buffers,
 326                             (unsigned*)&blitter->saved_num_vertex_buffers,
 327                             vertex_buffers,
 328                             num_vertex_buffers);
 329 }
 330
 331 #ifdef __cplusplus
 332 }
 333 #endif
 334
 335 #endif