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/texformat.h"
  34 #include "main/texstore.h"
  35 #include "shader/prog_parameter.h"
  36
  37 #include "brw_context.h"
  38 #include "brw_state.h"
  39 #include "brw_defines.h"
  40
  41 /* Creates a new VS constant buffer reflecting the current VS program's
  42  * constants, if needed by the VS program.
  43  *
  44  * Otherwise, constants go through the CURBEs using the brw_constant_buffer
  45  * state atom.
  46  */
  47 static drm_intel_bo *
  48 brw_vs_update_constant_buffer(struct brw_context *brw)
  49 {
  50    struct intel_context *intel = &brw->intel;
  51    struct brw_vertex_program *vp =
  52       (struct brw_vertex_program *) brw->vertex_program;
  53    const struct gl_program_parameter_list *params = vp->program.Base.Parameters;
  54    const int size = params->NumParameters * 4 * sizeof(GLfloat);
  55    drm_intel_bo *const_buffer;
  56
  57    /* BRW_NEW_VERTEX_PROGRAM */
  58    if (!vp->use_const_buffer)
  59       return NULL;
  60
  61    const_buffer = drm_intel_bo_alloc(intel->bufmgr, "vp_const_buffer",
  62                                      size, 64);
  63
  64    /* _NEW_PROGRAM_CONSTANTS */
  65    dri_bo_subdata(const_buffer, 0, size, params->ParameterValues);
  66
  67    return const_buffer;
  68 }
  69
  70 /**
  71  * Update the surface state for a VS constant buffer.
  72  *
  73  * Sets brw->vs.surf_bo[surf] and brw->vp->const_buffer.
  74  */
  75 static void
  76 brw_update_vs_constant_surface( GLcontext *ctx,
  77                                 GLuint surf)
  78 {
  79    struct brw_context *brw = brw_context(ctx);
  80    struct brw_surface_key key;
  81    struct brw_vertex_program *vp =
  82       (struct brw_vertex_program *) brw->vertex_program;
  83    const struct gl_program_parameter_list *params = vp->program.Base.Parameters;
  84
  85    assert(surf == 0);
  86
  87    /* If we're in this state update atom, we need to update VS constants, so
  88     * free the old buffer and create a new one for the new contents.
  89     */
  90    dri_bo_unreference(vp->const_buffer);
  91    vp->const_buffer = brw_vs_update_constant_buffer(brw);
  92
  93    /* If there's no constant buffer, then no surface BO is needed to point at
  94     * it.
  95     */
  96    if (vp->const_buffer == 0) {
  97       drm_intel_bo_unreference(brw->vs.surf_bo[surf]);
  98       brw->vs.surf_bo[surf] = NULL;
  99       return;
 100    }
 101
 102    memset(&key, 0, sizeof(key));
 103
 104    key.format = MESA_FORMAT_RGBA_FLOAT32;
 105    key.internal_format = GL_RGBA;
 106    key.bo = vp->const_buffer;
 107    key.depthmode = GL_NONE;
 108    key.pitch = params->NumParameters;
 109    key.width = params->NumParameters;
 110    key.height = 1;
 111    key.depth = 1;
 112    key.cpp = 16;
 113
 114    /*
 115    printf("%s:\n", __FUNCTION__);
 116    printf("  width %d  height %d  depth %d  cpp %d  pitch %d\n",
 117           key.width, key.height, key.depth, key.cpp, key.pitch);
 118    */
 119
 120    drm_intel_bo_unreference(brw->vs.surf_bo[surf]);
 121    brw->vs.surf_bo[surf] = brw_search_cache(&brw->surface_cache,
 122                                             BRW_SS_SURFACE,
 123                                             &key, sizeof(key),
 124                                             &key.bo, key.bo ? 1 : 0,
 125                                             NULL);
 126    if (brw->vs.surf_bo[surf] == NULL) {
 127       brw->vs.surf_bo[surf] = brw_create_constant_surface(brw, &key);
 128    }
 129 }
 130
 131
 132 /**
 133  * Constructs the binding table for the VS surface state.
 134  */
 135 static dri_bo *
 136 brw_vs_get_binding_table(struct brw_context *brw)
 137 {
 138    dri_bo *bind_bo;
 139
 140    bind_bo = brw_search_cache(&brw->surface_cache, BRW_SS_SURF_BIND,
 141                               NULL, 0,
 142                               brw->vs.surf_bo, BRW_VS_MAX_SURF,
 143                               NULL);
 144
 145    if (bind_bo == NULL) {
 146       GLuint data_size = BRW_VS_MAX_SURF * sizeof(GLuint);
 147       uint32_t *data = malloc(data_size);
 148       int i;
 149
 150       for (i = 0; i < BRW_VS_MAX_SURF; i++)
 151          if (brw->vs.surf_bo[i])
 152             data[i] = brw->vs.surf_bo[i]->offset;
 153          else
 154             data[i] = 0;
 155
 156       bind_bo = brw_upload_cache( &brw->surface_cache, BRW_SS_SURF_BIND,
 157                                   NULL, 0,
 158                                   brw->vs.surf_bo, BRW_VS_MAX_SURF,
 159                                   data, data_size,
 160                                   NULL, NULL);
 161
 162       /* Emit binding table relocations to surface state */
 163       for (i = 0; i < BRW_VS_MAX_SURF; i++) {
 164          if (brw->vs.surf_bo[i] != NULL) {
 165             /* The presumed offsets were set in the data values for
 166              * brw_upload_cache.
 167              */
 168             drm_intel_bo_emit_reloc(bind_bo, i * 4,
 169                                     brw->vs.surf_bo[i], 0,
 170                                     I915_GEM_DOMAIN_INSTRUCTION, 0);
 171          }
 172       }
 173
 174       free(data);
 175    }
 176
 177    return bind_bo;
 178 }
 179
 180 /**
 181  * Vertex shader surfaces (constant buffer).
 182  *
 183  * This consumes the state updates for the constant buffer needing
 184  * to be updated, and produces BRW_NEW_NR_VS_SURFACES for the VS unit and
 185  * CACHE_NEW_SURF_BIND for the binding table upload.
 186  */
 187 static void prepare_vs_surfaces(struct brw_context *brw )
 188 {
 189    GLcontext *ctx = &brw->intel.ctx;
 190    int i;
 191    int nr_surfaces = 0;
 192
 193    brw_update_vs_constant_surface(ctx, SURF_INDEX_VERT_CONST_BUFFER);
 194
 195    for (i = 0; i < BRW_VS_MAX_SURF; i++) {
 196       if (brw->vs.surf_bo[i] != NULL) {
 197          nr_surfaces = i + 1;
 198       }
 199    }
 200
 201    if (brw->vs.nr_surfaces != nr_surfaces) {
 202       brw->state.dirty.brw |= BRW_NEW_NR_VS_SURFACES;
 203       brw->vs.nr_surfaces = nr_surfaces;
 204    }
 205
 206    /* Note that we don't end up updating the bind_bo if we don't have a
 207     * surface to be pointing at.  This should be relatively harmless, as it
 208     * just slightly increases our working set size.
 209     */
 210    if (brw->vs.nr_surfaces != 0) {
 211       dri_bo_unreference(brw->vs.bind_bo);
 212       brw->vs.bind_bo = brw_vs_get_binding_table(brw);
 213    }
 214 }
 215
 216 const struct brw_tracked_state brw_vs_surfaces = {
 217    .dirty = {
 218       .mesa = (_NEW_PROGRAM_CONSTANTS),
 219       .brw = (BRW_NEW_VERTEX_PROGRAM),
 220       .cache = 0
 221    },
 222    .prepare = prepare_vs_surfaces,
 223 };
 224
 225
 226