brw_vs_surface_state.c revision ec2b92f98c2e7f161521b447cc1d9a36bce3707c 
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 "program/prog_parameter.h"
35
36#include "brw_context.h"
37#include "brw_state.h"
38
39/* Creates a new VS constant buffer reflecting the current VS program's
40 * constants, if needed by the VS program.
41 *
42 * Otherwise, constants go through the CURBEs using the brw_constant_buffer
43 * state atom.
44 */
45static drm_intel_bo *
46brw_vs_update_constant_buffer(struct brw_context *brw)
47{
48   struct intel_context *intel = &brw->intel;
49   struct brw_vertex_program *vp =
50      (struct brw_vertex_program *) brw->vertex_program;
51   const struct gl_program_parameter_list *params = vp->program.Base.Parameters;
52   const int size = params->NumParameters * 4 * sizeof(GLfloat);
53   drm_intel_bo *const_buffer;
54   int i;
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
65   /* Updates the ParamaterValues[i] pointers for all parameters of the
66    * basic type of PROGRAM_STATE_VAR.
67    */
68   _mesa_load_state_parameters(&brw->intel.ctx, vp->program.Base.Parameters);
69
70   drm_intel_gem_bo_map_gtt(const_buffer);
71   for (i = 0; i < params->NumParameters; i++) {
72      memcpy(const_buffer->virtual + i * 4 * sizeof(float),
73	     params->ParameterValues[i],
74	     4 * sizeof(float));
75   }
76   drm_intel_gem_bo_unmap_gtt(const_buffer);
77
78   return const_buffer;
79}
80
81/**
82 * Update the surface state for a VS constant buffer.
83 *
84 * Sets brw->vs.surf_bo[surf] and brw->vp->const_buffer.
85 */
86static void
87brw_update_vs_constant_surface( GLcontext *ctx,
88                                GLuint surf)
89{
90   struct brw_context *brw = brw_context(ctx);
91   struct brw_surface_key key;
92   struct brw_vertex_program *vp =
93      (struct brw_vertex_program *) brw->vertex_program;
94   const struct gl_program_parameter_list *params = vp->program.Base.Parameters;
95
96   assert(surf == 0);
97
98   /* If we're in this state update atom, we need to update VS constants, so
99    * free the old buffer and create a new one for the new contents.
100    */
101   drm_intel_bo_unreference(vp->const_buffer);
102   vp->const_buffer = brw_vs_update_constant_buffer(brw);
103
104   /* If there's no constant buffer, then no surface BO is needed to point at
105    * it.
106    */
107   if (vp->const_buffer == NULL) {
108      drm_intel_bo_unreference(brw->vs.surf_bo[surf]);
109      brw->vs.surf_bo[surf] = NULL;
110      return;
111   }
112
113   memset(&key, 0, sizeof(key));
114
115   key.format = MESA_FORMAT_RGBA_FLOAT32;
116   key.internal_format = GL_RGBA;
117   key.bo = vp->const_buffer;
118   key.depthmode = GL_NONE;
119   key.pitch = params->NumParameters;
120   key.width = params->NumParameters;
121   key.height = 1;
122   key.depth = 1;
123   key.cpp = 16;
124
125   /*
126   printf("%s:\n", __FUNCTION__);
127   printf("  width %d  height %d  depth %d  cpp %d  pitch %d\n",
128          key.width, key.height, key.depth, key.cpp, key.pitch);
129   */
130
131   drm_intel_bo_unreference(brw->vs.surf_bo[surf]);
132   brw->vs.surf_bo[surf] = brw_search_cache(&brw->surface_cache,
133                                            BRW_SS_SURFACE,
134                                            &key, sizeof(key),
135                                            &key.bo, 1,
136                                            NULL);
137   if (brw->vs.surf_bo[surf] == NULL) {
138      brw->vs.surf_bo[surf] = brw_create_constant_surface(brw, &key);
139   }
140}
141
142
143/**
144 * Constructs the binding table for the VS surface state.
145 */
146static drm_intel_bo *
147brw_vs_get_binding_table(struct brw_context *brw)
148{
149   drm_intel_bo *bind_bo;
150
151   bind_bo = brw_search_cache(&brw->surface_cache, BRW_SS_SURF_BIND,
152			      NULL, 0,
153			      brw->vs.surf_bo, BRW_VS_MAX_SURF,
154			      NULL);
155
156   if (bind_bo == NULL) {
157      GLuint data_size = BRW_VS_MAX_SURF * sizeof(GLuint);
158      uint32_t data[BRW_VS_MAX_SURF];
159      int i;
160
161      for (i = 0; i < BRW_VS_MAX_SURF; i++)
162         if (brw->vs.surf_bo[i])
163            data[i] = brw->vs.surf_bo[i]->offset;
164         else
165            data[i] = 0;
166
167      bind_bo = brw_upload_cache( &brw->surface_cache, BRW_SS_SURF_BIND,
168				  NULL, 0,
169				  brw->vs.surf_bo, BRW_VS_MAX_SURF,
170				  data, data_size);
171
172      /* Emit binding table relocations to surface state */
173      for (i = 0; i < BRW_VS_MAX_SURF; i++) {
174	 if (brw->vs.surf_bo[i] != NULL) {
175	    /* The presumed offsets were set in the data values for
176	     * brw_upload_cache.
177	     */
178	    drm_intel_bo_emit_reloc(bind_bo, i * 4,
179				    brw->vs.surf_bo[i], 0,
180				    I915_GEM_DOMAIN_INSTRUCTION, 0);
181	 }
182      }
183   }
184
185   return bind_bo;
186}
187
188/**
189 * Vertex shader surfaces (constant buffer).
190 *
191 * This consumes the state updates for the constant buffer needing
192 * to be updated, and produces BRW_NEW_NR_VS_SURFACES for the VS unit and
193 * CACHE_NEW_SURF_BIND for the binding table upload.
194 */
195static void prepare_vs_surfaces(struct brw_context *brw )
196{
197   GLcontext *ctx = &brw->intel.ctx;
198   int i;
199   int nr_surfaces = 0;
200
201   brw_update_vs_constant_surface(ctx, SURF_INDEX_VERT_CONST_BUFFER);
202
203   for (i = 0; i < BRW_VS_MAX_SURF; i++) {
204      if (brw->vs.surf_bo[i] != NULL) {
205	 nr_surfaces = i + 1;
206      }
207   }
208
209   if (brw->vs.nr_surfaces != nr_surfaces) {
210      brw->state.dirty.brw |= BRW_NEW_NR_VS_SURFACES;
211      brw->vs.nr_surfaces = nr_surfaces;
212   }
213
214   /* Note that we don't end up updating the bind_bo if we don't have a
215    * surface to be pointing at.  This should be relatively harmless, as it
216    * just slightly increases our working set size.
217    */
218   if (brw->vs.nr_surfaces != 0) {
219      drm_intel_bo_unreference(brw->vs.bind_bo);
220      brw->vs.bind_bo = brw_vs_get_binding_table(brw);
221   }
222}
223
224const struct brw_tracked_state brw_vs_surfaces = {
225   .dirty = {
226      .mesa = (_NEW_PROGRAM_CONSTANTS),
227      .brw = (BRW_NEW_VERTEX_PROGRAM),
228      .cache = 0
229   },
230   .prepare = prepare_vs_surfaces,
231};
232
233
234
235