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
  30 #include "pipe/p_state.h"
  31
  32 #include "brw_batchbuffer.h"
  33 #include "brw_screen.h"
  34 #include "brw_context.h"
  35
  36 #define MASK16 0xffff
  37 #define MASK24 0xffffff
  38
  39
  40 /**
  41  * Use blitting to clear the renderbuffers named by 'flags'.
  42  * Note: we can't use the ctx->DrawBuffer->_ColorDrawBufferIndexes field
  43  * since that might include software renderbuffers or renderbuffers
  44  * which we're clearing with triangles.
  45  * \param mask  bitmask of BUFFER_BIT_* values indicating buffers to clear
  46  */
  47 static enum pipe_error
  48 try_clear( struct brw_context *brw,
  49            struct brw_surface *surface,
  50            unsigned value )
  51 {
  52    uint32_t BR13, CMD;
  53    int x1 = 0;
  54    int y1 = 0;
  55    int x2 = surface->base.width;
  56    int y2 = surface->base.height;
  57    int pitch = surface->pitch;
  58    int cpp = surface->cpp;
  59
  60    if (x2 == 0 || y2 == 0)
  61       return 0;
  62
  63    debug_printf("%s dst:buf(%p)/%d+%d %d,%d sz:%dx%d\n",
  64                 __FUNCTION__,
  65                 (void *)surface->bo, pitch * cpp,
  66                 surface->base.offset,
  67                 x1, y1, x2 - x1, y2 - y1);
  68
  69    BR13 = 0xf0 << 16;
  70    CMD = XY_COLOR_BLT_CMD | XY_BLT_WRITE_RGB | XY_BLT_WRITE_ALPHA;
  71
  72    /* Setup the blit command */
  73    if (cpp == 4) {
  74       BR13 |= BR13_8888;
  75       CMD |= XY_BLT_WRITE_ALPHA | XY_BLT_WRITE_RGB;
  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->base.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
 126    if (ret != 0) {
 127       brw_context_flush( brw );
 128       ret = try_clear( brw, bsurface, value.ui );
 129       assert( ret == 0 );
 130    }
 131 }
 132
 133 static void zstencil_clear(struct brw_context *brw,
 134                            struct brw_surface *bsurface,
 135                            double depth,
 136                            unsigned stencil )
 137 {
 138    enum pipe_error ret;
 139    unsigned value;
 140
 141    switch (bsurface->base.format) {
 142    case PIPE_FORMAT_Z24X8_UNORM:
 143    case PIPE_FORMAT_Z24S8_UNORM:
 144       value = ((unsigned)(depth * MASK24) & MASK24);
 145       break;
 146    case PIPE_FORMAT_Z16_UNORM:
 147       value = ((unsigned)(depth * MASK16) & MASK16);
 148       break;
 149    default:
 150       assert(0);
 151       return;
 152    }
 153
 154    switch (bsurface->base.format) {
 155    case PIPE_FORMAT_Z24X8_UNORM:
 156    case PIPE_FORMAT_Z24S8_UNORM:
 157       value = value | (stencil << 24);
 158       break;
 159
 160    case PIPE_FORMAT_Z16_UNORM:
 161       value = value | (value << 16);
 162       break;
 163
 164    default:
 165       break;
 166    }
 167
 168    ret = try_clear( brw, bsurface, value );
 169
 170    if (ret != 0) {
 171       brw_context_flush( brw );
 172       ret = try_clear( brw, bsurface, value );
 173       assert( ret == 0 );
 174    }
 175 }
 176
 177
 178
 179 /**
 180  * Clear the given surface to the specified value.
 181  * No masking, no scissor (clear entire buffer).
 182  */
 183 static void brw_clear(struct pipe_context *pipe,
 184                       unsigned buffers,
 185                       const float *rgba,
 186                       double depth,
 187                       unsigned stencil)
 188 {
 189    struct brw_context *brw = brw_context( pipe );
 190    int i;
 191
 192    if (buffers & PIPE_CLEAR_COLOR) {
 193       for (i = 0; i < brw->curr.fb.nr_cbufs; i++) {
 194          color_clear( brw,
 195                       brw_surface(brw->curr.fb.cbufs[i]),
 196                       rgba );
 197       }
 198    }
 199
 200    if (buffers & PIPE_CLEAR_DEPTHSTENCIL) {
 201       if (brw->curr.fb.zsbuf) {
 202          zstencil_clear( brw,
 203                          brw_surface(brw->curr.fb.zsbuf),
 204                          depth, stencil );
 205       }
 206    }
 207 }
 208
 209
 210 void brw_pipe_clear_init( struct brw_context *brw )
 211 {
 212    brw->base.clear = brw_clear;
 213 }
 214
 215
 216 void brw_pipe_clear_cleanup( struct brw_context *brw )
 217 {
 218 }