src/mesa/drivers/dri/i965/brw_vs_surface_state.c

   1 /*
   2  Copyright (C) Intel Corp.  2006.  All Rights Reserved.
   3  Intel funded Tungsten Graphics (http://www.tungstengraphics.com) to
   4  develop this 3D driver.
   5
   6  Permission is hereby granted, free of charge, to any person obtaining
   7  a 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, sublicense, 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
  16  portions of the Software.
  17
  18  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  19  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  21  IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
  22  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  23  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  24  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25
  26  **********************************************************************/
  27  /*
  28   * Authors:
  29   *   Keith Whitwell <keith@tungstengraphics.com>
  30   */
  31
  32 #include "main/mtypes.h"
  33 #include "main/texstore.h"
  34 #include "shader/prog_parameter.h"
  35
  36 #include "brw_context.h"
  37 #include "brw_state.h"
  38 #include "brw_defines.h"
  39
  40 /* Creates a new VS constant buffer reflecting the current VS program's
  41  * constants, if needed by the VS program.
  42  *
  43  * Otherwise, constants go through the CURBEs using the brw_constant_buffer
  44  * state atom.
  45  */
  46 static drm_intel_bo *
  47 brw_vs_update_constant_buffer(struct brw_context *brw)
  48 {
  49    struct intel_context *intel = &brw->intel;
  50    struct brw_vertex_program *vp =
  51       (struct brw_vertex_program *) brw->vertex_program;
  52    const struct gl_program_parameter_list *params = vp->program.Base.Parameters;
  53    const int size = params->NumParameters * 4 * sizeof(GLfloat);
  54    drm_intel_bo *const_buffer;
  55
  56    /* BRW_NEW_VERTEX_PROGRAM */
  57    if (!vp->use_const_buffer)
  58       return NULL;
  59
  60    const_buffer = drm_intel_bo_alloc(intel->bufmgr, "vp_const_buffer",
  61                                      size, 64);
  62
  63    /* _NEW_PROGRAM_CONSTANTS */
  64    dri_bo_subdata(const_buffer, 0, size, params->ParameterValues);
  65
  66    return const_buffer;
  67 }
  68
  69 /**
  70  * Update the surface state for a VS constant buffer.
  71  *
  72  * Sets brw->vs.surf_bo[surf] and brw->vp->const_buffer.
  73  */
  74 static void
  75 brw_update_vs_constant_surface( GLcontext *ctx,
  76                                 GLuint surf)
  77 {
  78    struct brw_context *brw = brw_context(ctx);
  79    struct brw_surface_key key;
  80    struct brw_vertex_program *vp =
  81       (struct brw_vertex_program *) brw->vertex_program;
  82    const struct gl_program_parameter_list *params = vp->program.Base.Parameters;
  83
  84    assert(surf == 0);
  85
  86    /* If we're in this state update atom, we need to update VS constants, so
  87     * free the old buffer and create a new one for the new contents.
  88     */
  89    dri_bo_unreference(vp->const_buffer);
  90    vp->const_buffer = brw_vs_update_constant_buffer(brw);
  91
  92    /* If there's no constant buffer, then no surface BO is needed to point at
  93     * it.
  94     */
  95    if (vp->const_buffer == 0) {
  96       drm_intel_bo_unreference(brw->vs.surf_bo[surf]);
  97       brw->vs.surf_bo[surf] = NULL;
  98       return;
  99    }
 100
 101    memset(&key, 0, sizeof(key));
 102
 103    key.format = MESA_FORMAT_RGBA_FLOAT32;
 104    key.internal_format = GL_RGBA;
 105    key.bo = vp->const_buffer;
 106    key.depthmode = GL_NONE;
 107    key.pitch = params->NumParameters;
 108    key.width = params->NumParameters;
 109    key.height = 1;
 110    key.depth = 1;
 111    key.cpp = 16;
 112
 113    /*
 114    printf("%s:\n", __FUNCTION__);
 115    printf("  width %d  height %d  depth %d  cpp %d  pitch %d\n",
 116           key.width, key.height, key.depth, key.cpp, key.pitch);
 117    */
 118
 119    drm_intel_bo_unreference(brw->vs.surf_bo[surf]);
 120    brw->vs.surf_bo[surf] = brw_search_cache(&brw->surface_cache,
 121                                             BRW_SS_SURFACE,
 122                                             &key, sizeof(key),
 123                                             &key.bo, key.bo ? 1 : 0,
 124                                             NULL);
 125    if (brw->vs.surf_bo[surf] == NULL) {
 126       brw->vs.surf_bo[surf] = brw_create_constant_surface(brw, &key);
 127    }
 128 }
 129
 130
 131 /**
 132  * Constructs the binding table for the VS surface state.
 133  */
 134 static dri_bo *
 135 brw_vs_get_binding_table(struct brw_context *brw)
 136 {
 137    dri_bo *bind_bo;
 138
 139    bind_bo = brw_search_cache(&brw->surface_cache, BRW_SS_SURF_BIND,
 140                               NULL, 0,
 141                               brw->vs.surf_bo, BRW_VS_MAX_SURF,
 142                               NULL);
 143
 144    if (bind_bo == NULL) {
 145       GLuint data_size = BRW_VS_MAX_SURF * sizeof(GLuint);
 146       uint32_t *data = malloc(data_size);
 147       int i;
 148
 149       for (i = 0; i < BRW_VS_MAX_SURF; i++)
 150          if (brw->vs.surf_bo[i])
 151             data[i] = brw->vs.surf_bo[i]->offset;
 152          else
 153             data[i] = 0;
 154
 155       bind_bo = brw_upload_cache( &brw->surface_cache, BRW_SS_SURF_BIND,
 156                                   NULL, 0,
 157                                   brw->vs.surf_bo, BRW_VS_MAX_SURF,
 158                                   data, data_size,
 159                                   NULL, NULL);
 160
 161       /* Emit binding table relocations to surface state */
 162       for (i = 0; i < BRW_VS_MAX_SURF; i++) {
 163          if (brw->vs.surf_bo[i] != NULL) {
 164             /* The presumed offsets were set in the data values for
 165              * brw_upload_cache.
 166              */
 167             drm_intel_bo_emit_reloc(bind_bo, i * 4,
 168                                     brw->vs.surf_bo[i], 0,
 169                                     I915_GEM_DOMAIN_INSTRUCTION, 0);
 170          }
 171       }
 172
 173       free(data);
 174    }
 175
 176    return bind_bo;
 177 }
 178
 179 /**
 180  * Vertex shader surfaces (constant buffer).
 181  *
 182  * This consumes the state updates for the constant buffer needing
 183  * to be updated, and produces BRW_NEW_NR_VS_SURFACES for the VS unit and
 184  * CACHE_NEW_SURF_BIND for the binding table upload.
 185  */
 186 static void prepare_vs_surfaces(struct brw_context *brw )
 187 {
 188    GLcontext *ctx = &brw->intel.ctx;
 189    int i;
 190    int nr_surfaces = 0;
 191
 192    brw_update_vs_constant_surface(ctx, SURF_INDEX_VERT_CONST_BUFFER);
 193
 194    for (i = 0; i < BRW_VS_MAX_SURF; i++) {
 195       if (brw->vs.surf_bo[i] != NULL) {
 196          nr_surfaces = i + 1;
 197       }
 198    }
 199
 200    if (brw->vs.nr_surfaces != nr_surfaces) {
 201       brw->state.dirty.brw |= BRW_NEW_NR_VS_SURFACES;
 202       brw->vs.nr_surfaces = nr_surfaces;
 203    }
 204
 205    /* Note that we don't end up updating the bind_bo if we don't have a
 206     * surface to be pointing at.  This should be relatively harmless, as it
 207     * just slightly increases our working set size.
 208     */
 209    if (brw->vs.nr_surfaces != 0) {
 210       dri_bo_unreference(brw->vs.bind_bo);
 211       brw->vs.bind_bo = brw_vs_get_binding_table(brw);
 212    }
 213 }
 214
 215 const struct brw_tracked_state brw_vs_surfaces = {
 216    .dirty = {
 217       .mesa = (_NEW_PROGRAM_CONSTANTS),
 218       .brw = (BRW_NEW_VERTEX_PROGRAM),
 219       .cache = 0
 220    },
 221    .prepare = prepare_vs_surfaces,
 222 };
 223
 224
 225