src/gallium/drivers/i965/brw_pipe_clear.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2003 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 #include "util/u_pack_color.h"
  29 #include "util/u_math.h"
  30
  31 #include "pipe/p_state.h"
  32
  33 #include "brw_batchbuffer.h"
  34 #include "brw_screen.h"
  35 #include "brw_context.h"
  36
  37 #define MASK16 0xffff
  38 #define MASK24 0xffffff
  39
  40
  41 /**
  42  * Use blitting to clear the renderbuffers named by 'flags'.
  43  * Note: we can't use the ctx->DrawBuffer->_ColorDrawBufferIndexes field
  44  * since that might include software renderbuffers or renderbuffers
  45  * which we're clearing with triangles.
  46  */
  47 static enum pipe_error
  48 try_clear( struct brw_context *brw,
  49            struct brw_surface *surface,
  50            unsigned value,
  51            unsigned rgba_mask)
  52 {
  53    uint32_t BR13, CMD;
  54    int x1 = 0;
  55    int y1 = 0;
  56    int x2 = surface->base.width;
  57    int y2 = surface->base.height;
  58    int pitch = surface->pitch;
  59    int cpp = surface->cpp;
  60
  61    if (x2 == 0 || y2 == 0)
  62       return 0;
  63
  64    debug_printf("%s dst:buf(%p)/%d+%d %d,%d sz:%dx%d\n",
  65                 __FUNCTION__,
  66                 (void *)surface->bo, pitch * cpp,
  67                 surface->offset,
  68                 x1, y1, x2 - x1, y2 - y1);
  69
  70    BR13 = 0xf0 << 16;
  71    CMD = XY_COLOR_BLT_CMD | rgba_mask;
  72
  73    /* Setup the blit command */
  74    if (cpp == 4) {
  75       BR13 |= BR13_8888;
  76    }
  77    else {
  78       assert(cpp == 2);
  79       BR13 |= BR13_565;
  80    }
  81
  82    /* XXX: nasty hack for clearing depth buffers
  83     */
  84    if (surface->tiling == BRW_TILING_Y) {
  85       x2 = pitch;
  86    }
  87
  88    if (surface->tiling == BRW_TILING_X) {
  89       CMD |= XY_DST_TILED;
  90       pitch /= 4;
  91    }
  92
  93    BR13 |= (pitch * cpp);
  94
  95    BEGIN_BATCH(6, 0);
  96    OUT_BATCH(CMD);
  97    OUT_BATCH(BR13);
  98    OUT_BATCH((y1 << 16) | x1);
  99    OUT_BATCH((y2 << 16) | x2);
 100    OUT_RELOC(surface->bo,
 101              BRW_USAGE_BLIT_DEST,
 102              surface->offset);
 103    OUT_BATCH(value);
 104    ADVANCE_BATCH();
 105
 106    return 0;
 107 }
 108
 109
 110
 111
 112 static void color_clear(struct brw_context *brw,
 113                         struct brw_surface *bsurface,
 114                         const float *rgba )
 115 {
 116    enum pipe_error ret;
 117    union util_color value;
 118
 119    util_pack_color( rgba, bsurface->base.format, &value );
 120
 121    if (bsurface->cpp == 2)
 122       value.ui |= value.ui << 16;
 123
 124    ret = try_clear( brw, bsurface, value.ui,
 125                     XY_BLT_WRITE_RGB | XY_BLT_WRITE_ALPHA );
 126
 127    if (ret != 0) {
 128       brw_context_flush( brw );
 129       ret = try_clear( brw, bsurface, value.ui,
 130                        XY_BLT_WRITE_RGB | XY_BLT_WRITE_ALPHA );
 131       assert( ret == 0 );
 132    }
 133 }
 134
 135 static void zstencil_clear(struct brw_context *brw,
 136                            struct brw_surface *bsurface,
 137                            unsigned clear_flags,
 138                            double depth,
 139                            unsigned stencil )
 140 {
 141    enum pipe_error ret;
 142    unsigned value;
 143    unsigned mask = 0;
 144    union fi tmp;
 145
 146    if (clear_flags & PIPE_CLEAR_DEPTH)
 147       mask |= XY_BLT_WRITE_RGB;
 148
 149    switch (bsurface->base.format) {
 150    case PIPE_FORMAT_Z32_FLOAT:
 151       tmp.f = (float)depth;
 152       value = tmp.ui;
 153       break;
 154    case PIPE_FORMAT_Z24X8_UNORM:
 155    case PIPE_FORMAT_Z24_UNORM_S8_USCALED:
 156       value = ((unsigned)(depth * MASK24) & MASK24);
 157       break;
 158    case PIPE_FORMAT_Z16_UNORM:
 159       value = ((unsigned)(depth * MASK16) & MASK16);
 160       break;
 161    default:
 162       assert(0);
 163       return;
 164    }
 165
 166    switch (bsurface->base.format) {
 167    case PIPE_FORMAT_Z32_FLOAT:
 168       mask |= XY_BLT_WRITE_ALPHA;
 169       break;
 170    case PIPE_FORMAT_Z24X8_UNORM:
 171       value = value | (stencil << 24);
 172       mask |= XY_BLT_WRITE_ALPHA;
 173       break;
 174    case PIPE_FORMAT_Z24_UNORM_S8_USCALED:
 175       value = value | (stencil << 24);
 176       if (clear_flags & PIPE_CLEAR_STENCIL)
 177          mask |= XY_BLT_WRITE_ALPHA;
 178       break;
 179    case PIPE_FORMAT_Z16_UNORM:
 180       value = value | (value << 16);
 181       mask |= XY_BLT_WRITE_ALPHA;
 182       break;
 183    default:
 184       break;
 185    }
 186
 187    ret = try_clear( brw, bsurface, value, mask );
 188
 189    if (ret != 0) {
 190       brw_context_flush( brw );
 191       ret = try_clear( brw, bsurface, value, mask );
 192       assert( ret == 0 );
 193    }
 194 }
 195
 196
 197
 198 /**
 199  * Clear the given surface to the specified value.
 200  * No masking, no scissor (clear entire buffer).
 201  */
 202 static void brw_clear(struct pipe_context *pipe,
 203                       unsigned buffers,
 204                       const union pipe_color_union *color,
 205                       double depth,
 206                       unsigned stencil)
 207 {
 208    struct brw_context *brw = brw_context( pipe );
 209    int i;
 210
 211    if (buffers & PIPE_CLEAR_COLOR) {
 212       for (i = 0; i < brw->curr.fb.nr_cbufs; i++) {
 213          color_clear( brw,
 214                       brw_surface(brw->curr.fb.cbufs[i]),
 215                       color->f );
 216       }
 217    }
 218
 219    if (buffers & PIPE_CLEAR_DEPTHSTENCIL) {
 220       if (brw->curr.fb.zsbuf) {
 221          zstencil_clear( brw,
 222                          brw_surface(brw->curr.fb.zsbuf),
 223                          buffers & PIPE_CLEAR_DEPTHSTENCIL,
 224                          depth, stencil );
 225       }
 226    }
 227 }
 228
 229 /* XXX should respect region */
 230 static void brw_clear_render_target(struct pipe_context *pipe,
 231                                     struct pipe_surface *dst,
 232                                     const union pipe_color_union *color,
 233                                     unsigned dstx, unsigned dsty,
 234                                     unsigned width, unsigned height)
 235 {
 236    struct brw_context *brw = brw_context( pipe );
 237
 238    color_clear( brw,
 239                 brw_surface(dst),
 240                 color->f );
 241 }
 242
 243 /* XXX should respect region */
 244 static void brw_clear_depth_stencil(struct pipe_context *pipe,
 245                                     struct pipe_surface *dst,
 246                                     unsigned clear_flags,
 247                                     double depth,
 248                                     unsigned stencil,
 249                                     unsigned dstx, unsigned dsty,
 250                                     unsigned width, unsigned height)
 251 {
 252    struct brw_context *brw = brw_context( pipe );
 253
 254    zstencil_clear( brw,
 255                    brw_surface(dst),
 256                    clear_flags,
 257                    depth, stencil );
 258 }
 259
 260 void brw_pipe_clear_init( struct brw_context *brw )
 261 {
 262    brw->base.clear = brw_clear;
 263    brw->base.clear_render_target = brw_clear_render_target;
 264    brw->base.clear_depth_stencil = brw_clear_depth_stencil;
 265 }
 266
 267
 268 void brw_pipe_clear_cleanup( struct brw_context *brw )
 269 {
 270 }