src/gallium/drivers/cell/ppu/cell_clear.c

   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  * Authors
  30  *  Brian Paul
  31  */
  32
  33 #include <stdio.h>
  34 #include <assert.h>
  35 #include <stdint.h>
  36 #include "pipe/p_inlines.h"
  37 #include "util/u_memory.h"
  38 #include "util/u_pack_color.h"
  39 #include "cell/common.h"
  40 #include "cell_clear.h"
  41 #include "cell_context.h"
  42 #include "cell_batch.h"
  43 #include "cell_flush.h"
  44 #include "cell_spu.h"
  45 #include "cell_state.h"
  46
  47
  48 /**
  49  * Convert packed pixel from one format to another.
  50  */
  51 static unsigned
  52 convert_color(enum pipe_format srcFormat, unsigned srcColor,
  53               enum pipe_format dstFormat)
  54 {
  55    ubyte r, g, b, a;
  56    unsigned dstColor;
  57
  58    util_unpack_color_ub(srcFormat, &srcColor, &r, &g, &b, &a);
  59    util_pack_color_ub(r, g, b, a, dstFormat, &dstColor);
  60
  61    return dstColor;
  62 }
  63
  64
  65
  66 /**
  67  * Called via pipe->clear()
  68  */
  69 void
  70 cell_clear_surface(struct pipe_context *pipe, struct pipe_surface *ps,
  71                    unsigned clearValue)
  72 {
  73    struct pipe_screen *screen = pipe->screen;
  74    struct cell_context *cell = cell_context(pipe);
  75    uint surfIndex;
  76
  77    if (cell->dirty)
  78       cell_update_derived(cell);
  79
  80
  81    if (!cell->cbuf_map[0])
  82       cell->cbuf_map[0] = screen->surface_map(screen, ps,
  83                                               PIPE_BUFFER_USAGE_GPU_WRITE);
  84
  85    if (ps == cell->framebuffer.zsbuf) {
  86       /* clear z/stencil buffer */
  87       surfIndex = 1;
  88    }
  89    else {
  90       /* clear color buffer */
  91       surfIndex = 0;
  92
  93       if (ps->format != PIPE_FORMAT_A8R8G8B8_UNORM) {
  94          clearValue = convert_color(PIPE_FORMAT_A8R8G8B8_UNORM, clearValue,
  95                                     ps->format);
  96       }
  97    }
  98
  99
 100    /* Build a CLEAR command and place it in the current batch buffer */
 101    {
 102       STATIC_ASSERT(sizeof(struct cell_command_clear_surface) % 16 == 0);
 103       struct cell_command_clear_surface *clr
 104          = (struct cell_command_clear_surface *)
 105          cell_batch_alloc16(cell, sizeof(*clr));
 106       clr->opcode[0] = CELL_CMD_CLEAR_SURFACE;
 107       clr->surface = surfIndex;
 108       clr->value = clearValue;
 109    }
 110
 111    /* Technically, the surface's contents are now known and cleared,
 112     * so we could set the status to PIPE_SURFACE_STATUS_CLEAR.  But
 113     * it turns out it's quite painful to recognize when any particular
 114     * surface goes from PIPE_SURFACE_STATUS_CLEAR to
 115     * PIPE_SURFACE_STATUS_DEFINED (i.e. with known contents), because
 116     * the drawing commands could be operating on numerous draw buffers,
 117     * which we'd have to iterate through to set all their stati...
 118     * For now, we cheat a bit and set the surface's status to DEFINED
 119     * right here.  Later we should revisit this and set the status to
 120     * CLEAR here, and find a better place to set the status to DEFINED.
 121     */
 122    ps->status = PIPE_SURFACE_STATUS_DEFINED;
 123 }