brw_vs_surface_state.c revision 3e34a2a2b97e7c93955deedb7c12b73bccd6662d 
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 */
46static drm_intel_bo *
47brw_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 */
74static void
75brw_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 */
134static dri_bo *
135brw_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 */
186static 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
215const 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
226