src/gallium/drivers/i965/brw_wm_constant_buffer.c

   1 /* XXX: Constant buffers disabled
   2  */
   3
   4
   5 /**
   6  * Create the constant buffer surface.  Vertex/fragment shader constants will be
   7  * read from this buffer with Data Port Read instructions/messages.
   8  */
   9 enum pipe_error
  10 brw_create_constant_surface( struct brw_context *brw,
  11                              struct brw_surface_key *key,
  12                              struct brw_winsys_buffer **bo_out )
  13 {
  14    const GLint w = key->width - 1;
  15    struct brw_winsys_buffer *bo;
  16    struct brw_winsys_reloc reloc[1];
  17    enum pipe_error ret;
  18
  19       /* Emit relocation to surface contents */
  20    make_reloc(&reloc[0],
  21               BRW_USAGE_SAMPLER,
  22               0,
  23               offsetof(struct brw_surface_state, ss1),
  24               key->bo);
  25
  26
  27    memset(&surf, 0, sizeof(surf));
  28
  29    surf.ss0.mipmap_layout_mode = BRW_SURFACE_MIPMAPLAYOUT_BELOW;
  30    surf.ss0.surface_type = BRW_SURFACE_BUFFER;
  31    surf.ss0.surface_format = BRW_SURFACEFORMAT_R32G32B32A32_FLOAT;
  32
  33    surf.ss1.base_addr = 0; /* reloc */
  34
  35    surf.ss2.width = w & 0x7f;            /* bits 6:0 of size or width */
  36    surf.ss2.height = (w >> 7) & 0x1fff;  /* bits 19:7 of size or width */
  37    surf.ss3.depth = (w >> 20) & 0x7f;    /* bits 26:20 of size or width */
  38    surf.ss3.pitch = (key->pitch * key->cpp) - 1; /* ignored?? */
  39    brw_set_surface_tiling(&surf, key->tiling); /* tiling now allowed */
  40
  41    ret = brw_upload_cache(&brw->surface_cache, BRW_SS_SURFACE,
  42                           key, sizeof(*key),
  43                           reloc, Elements(reloc),
  44                           &surf, sizeof(surf),
  45                           NULL, NULL,
  46                           &bo_out);
  47    if (ret)
  48       return ret;
  49
  50    return PIPE_OK;
  51 }
  52
  53
  54
  55 /**
  56  * Update the surface state for a WM constant buffer.
  57  * The constant buffer will be (re)allocated here if needed.
  58  */
  59 static enum pipe_error
  60 brw_update_wm_constant_surface( struct brw_context *brw,
  61                                 GLuint surf)
  62 {
  63    struct brw_surface_key key;
  64    struct brw_fragment_shader *fp = brw->curr.fragment_shader;
  65    struct pipe_buffer *cbuf = brw->curr.fragment_constants;
  66    int pitch = cbuf->size / (4 * sizeof(float));
  67    enum pipe_error ret;
  68
  69    /* If we're in this state update atom, we need to update WM constants, so
  70     * free the old buffer and create a new one for the new contents.
  71     */
  72    ret = brw_wm_update_constant_buffer(brw, &fp->const_buffer);
  73    if (ret)
  74       return ret;
  75
  76    /* If there's no constant buffer, then no surface BO is needed to point at
  77     * it.
  78     */
  79    if (cbuf == NULL) {
  80       bo_reference(&brw->wm.surf_bo[surf], NULL);
  81       return PIPE_OK;
  82    }
  83
  84    memset(&key, 0, sizeof(key));
  85
  86    key.ss0.mipmap_layout_mode = BRW_SURFACE_MIPMAPLAYOUT_BELOW;
  87    key.ss0.surface_type = BRW_SURFACE_BUFFER;
  88    key.ss0.surface_format = BRW_SURFACEFORMAT_R32G32B32A32_FLOAT;
  89
  90    key.bo = brw_buffer(cbuf)->bo;
  91
  92    key.ss2.width = (pitch-1) & 0x7f;            /* bits 6:0 of size or width */
  93    key.ss2.height = ((pitch-1) >> 7) & 0x1fff;  /* bits 19:7 of size or width */
  94    key.ss3.depth = ((pitch-1) >> 20) & 0x7f;    /* bits 26:20 of size or width */
  95    key.ss3.pitch = (pitch * 4 * sizeof(float)) - 1; /* ignored?? */
  96    brw_set_surface_tiling(&surf, key->tiling); /* tiling now allowed */
  97
  98
  99    /*
 100    printf("%s:\n", __FUNCTION__);
 101    printf("  width %d  height %d  depth %d  cpp %d  pitch %d\n",
 102           key.width, key.height, key.depth, key.cpp, key.pitch);
 103    */
 104
 105    if (brw_search_cache(&brw->surface_cache,
 106                         BRW_SS_SURFACE,
 107                         &key, sizeof(key),
 108                         &key.bo, 1,
 109                         NULL,
 110                         &brw->wm.surf_bo[surf]))
 111       return PIPE_OK;
 112
 113    ret = brw_create_constant_surface(brw, &key, &brw->wm.surf_bo[surf]);
 114    if (ret)
 115       return ret;
 116
 117    brw->state.dirty.brw |= BRW_NEW_WM_SURFACES;
 118    return PIPE_OK;
 119 }
 120
 121 /**
 122  * Updates surface / buffer for fragment shader constant buffer, if
 123  * one is required.
 124  *
 125  * This consumes the state updates for the constant buffer, and produces
 126  * BRW_NEW_WM_SURFACES to get picked up by brw_prepare_wm_surfaces for
 127  * inclusion in the binding table.
 128  */
 129 static enum pipe_error prepare_wm_constant_surface(struct brw_context *brw )
 130 {
 131    struct brw_fragment_program *fp =
 132       (struct brw_fragment_program *) brw->fragment_program;
 133    GLuint surf = SURF_INDEX_FRAG_CONST_BUFFER;
 134
 135    ret = brw_wm_update_constant_buffer(brw,
 136                                        &fp->const_buffer);
 137    if (ret)
 138       return ret;
 139
 140    /* If there's no constant buffer, then no surface BO is needed to point at
 141     * it.
 142     */
 143    if (fp->const_buffer == 0) {
 144       if (brw->wm.surf_bo[surf] != NULL) {
 145          bo_reference(&brw->wm.surf_bo[surf], NULL);
 146          brw->state.dirty.brw |= BRW_NEW_WM_SURFACES;
 147       }
 148       return PIPE_OK;
 149    }
 150
 151    ret = brw_update_wm_constant_surface(ctx, surf);
 152    if (ret)
 153       return ret;
 154
 155    return PIPE_OK
 156 }
 157
 158 const struct brw_tracked_state brw_wm_constant_surface = {
 159    .dirty = {
 160       .mesa = (_NEW_PROGRAM_CONSTANTS),
 161       .brw = (BRW_NEW_FRAGMENT_PROGRAM),
 162       .cache = 0
 163    },
 164    .prepare = prepare_wm_constant_surface,
 165 };