st_gen_mipmap.c revision 7bcc228beb754a8f1586590d2c5b1786be281531 
1/**************************************************************************
2 *
3 * Copyright 2008 Tungsten Graphics, Inc., Cedar Park, Texas.
4 * All Rights Reserved.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * 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, sub license, 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 portions
16 * of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
21 * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
22 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
23 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
24 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
25 *
26 **************************************************************************/
27
28
29#include "main/imports.h"
30#include "main/mipmap.h"
31#include "main/teximage.h"
32
33#include "pipe/p_context.h"
34#include "pipe/p_defines.h"
35#include "util/u_inlines.h"
36#include "util/u_format.h"
37#include "util/u_gen_mipmap.h"
38
39#include "st_debug.h"
40#include "st_context.h"
41#include "st_texture.h"
42#include "st_gen_mipmap.h"
43#include "st_cb_texture.h"
44
45
46/**
47 * one-time init for generate mipmap
48 * XXX Note: there may be other times we need no-op/simple state like this.
49 * In that case, some code refactoring would be good.
50 */
51void
52st_init_generate_mipmap(struct st_context *st)
53{
54   st->gen_mipmap = util_create_gen_mipmap(st->pipe, st->cso_context);
55}
56
57
58void
59st_destroy_generate_mipmap(struct st_context *st)
60{
61   util_destroy_gen_mipmap(st->gen_mipmap);
62   st->gen_mipmap = NULL;
63}
64
65
66/**
67 * Generate mipmap levels using hardware rendering.
68 * \return TRUE if successful, FALSE if not possible
69 */
70static boolean
71st_render_mipmap(struct st_context *st,
72                 GLenum target,
73                 struct st_texture_object *stObj,
74                 uint baseLevel, uint lastLevel)
75{
76   struct pipe_context *pipe = st->pipe;
77   struct pipe_screen *screen = pipe->screen;
78   struct pipe_sampler_view *psv;
79   const uint face = _mesa_tex_target_to_face(target);
80
81#if 0
82   assert(target != GL_TEXTURE_3D); /* implemented but untested */
83#endif
84
85   /* check if we can render in the texture's format */
86   /* XXX should probably kill this and always use util_gen_mipmap
87      since this implements a sw fallback as well */
88   if (!screen->is_format_supported(screen, stObj->pt->format,
89                                    stObj->pt->target,
90                                    0, PIPE_BIND_RENDER_TARGET)) {
91      return FALSE;
92   }
93
94   psv = st_create_texture_sampler_view(pipe, stObj->pt);
95
96   /* Disable conditional rendering. */
97   if (st->render_condition) {
98      pipe->render_condition(pipe, NULL, 0);
99   }
100
101   util_gen_mipmap(st->gen_mipmap, psv, face, baseLevel, lastLevel,
102                   PIPE_TEX_FILTER_LINEAR);
103
104   if (st->render_condition) {
105      pipe->render_condition(pipe, st->render_condition, st->condition_mode);
106   }
107
108   pipe_sampler_view_reference(&psv, NULL);
109
110   return TRUE;
111}
112
113/**
114 * Compute the expected number of mipmap levels in the texture given
115 * the width/height/depth of the base image and the GL_TEXTURE_BASE_LEVEL/
116 * GL_TEXTURE_MAX_LEVEL settings.  This will tell us how many mipmap
117 * levels should be generated.
118 */
119static GLuint
120compute_num_levels(struct gl_context *ctx,
121                   struct gl_texture_object *texObj,
122                   GLenum target)
123{
124   const struct gl_texture_image *baseImage;
125   GLuint numLevels;
126
127   baseImage = _mesa_get_tex_image(ctx, texObj, target, texObj->BaseLevel);
128
129   numLevels = texObj->BaseLevel + baseImage->MaxNumLevels;
130   numLevels = MIN2(numLevels, texObj->MaxLevel + 1);
131   assert(numLevels >= 1);
132
133   return numLevels;
134}
135
136
137/**
138 * Called via ctx->Driver.GenerateMipmap().
139 */
140void
141st_generate_mipmap(struct gl_context *ctx, GLenum target,
142                   struct gl_texture_object *texObj)
143{
144   struct st_context *st = st_context(ctx);
145   struct st_texture_object *stObj = st_texture_object(texObj);
146   struct pipe_resource *pt = st_get_texobj_resource(texObj);
147   const uint baseLevel = texObj->BaseLevel;
148   uint lastLevel;
149   uint dstLevel;
150
151   if (!pt)
152      return;
153
154   /* not sure if this ultimately actually should work,
155      but we're not supporting multisampled textures yet. */
156   assert(pt->nr_samples < 2);
157
158   /* find expected last mipmap level to generate*/
159   lastLevel = compute_num_levels(ctx, texObj, target) - 1;
160
161   if (lastLevel == 0)
162      return;
163
164   /* The texture isn't in a "complete" state yet so set the expected
165    * lastLevel here, since it won't get done in st_finalize_texture().
166    */
167   stObj->lastLevel = lastLevel;
168
169   if (pt->last_level < lastLevel) {
170      /* The current gallium texture doesn't have space for all the
171       * mipmap levels we need to generate.  So allocate a new texture.
172       */
173      struct pipe_resource *oldTex = stObj->pt;
174
175      /* create new texture with space for more levels */
176      stObj->pt = st_texture_create(st,
177                                    oldTex->target,
178                                    oldTex->format,
179                                    lastLevel,
180                                    oldTex->width0,
181                                    oldTex->height0,
182                                    oldTex->depth0,
183                                    oldTex->array_size,
184                                    oldTex->bind);
185
186      /* This will copy the old texture's base image into the new texture
187       * which we just allocated.
188       */
189      st_finalize_texture(ctx, st->pipe, texObj);
190
191      /* release the old tex (will likely be freed too) */
192      pipe_resource_reference(&oldTex, NULL);
193      pipe_sampler_view_reference(&stObj->sampler_view, NULL);
194   }
195   else {
196      /* Make sure that the base texture image data is present in the
197       * texture buffer.
198       */
199      st_finalize_texture(ctx, st->pipe, texObj);
200   }
201
202   pt = stObj->pt;
203
204   assert(pt->last_level >= lastLevel);
205
206   /* Try to generate the mipmap by rendering/texturing.  If that fails,
207    * use the software fallback.
208    */
209   if (!st_render_mipmap(st, target, stObj, baseLevel, lastLevel)) {
210      /* since the util code actually also has a fallback, should
211         probably make it never fail and kill this */
212      _mesa_generate_mipmap(ctx, target, texObj);
213   }
214
215   /* Fill in the Mesa gl_texture_image fields */
216   for (dstLevel = baseLevel + 1; dstLevel <= lastLevel; dstLevel++) {
217      const uint srcLevel = dstLevel - 1;
218      const struct gl_texture_image *srcImage
219         = _mesa_get_tex_image(ctx, texObj, target, srcLevel);
220      struct gl_texture_image *dstImage;
221      struct st_texture_image *stImage;
222      uint border = srcImage->Border;
223      uint dstWidth, dstHeight, dstDepth;
224
225      dstWidth = u_minify(pt->width0, dstLevel);
226      if (texObj->Target == GL_TEXTURE_1D_ARRAY) {
227         dstHeight = pt->array_size;
228      }
229      else {
230         dstHeight = u_minify(pt->height0, dstLevel);
231      }
232      if (texObj->Target == GL_TEXTURE_2D_ARRAY) {
233         dstDepth = pt->array_size;
234      }
235      else {
236         dstDepth = u_minify(pt->depth0, dstLevel);
237      }
238
239      dstImage = _mesa_get_tex_image(ctx, texObj, target, dstLevel);
240      if (!dstImage) {
241         _mesa_error(ctx, GL_OUT_OF_MEMORY, "generating mipmaps");
242         return;
243      }
244
245      /* Free old image data */
246      ctx->Driver.FreeTextureImageBuffer(ctx, dstImage);
247
248      /* initialize new image */
249      _mesa_init_teximage_fields(ctx, dstImage, dstWidth, dstHeight,
250                                 dstDepth, border, srcImage->InternalFormat,
251                                 srcImage->TexFormat);
252
253      stImage = st_texture_image(dstImage);
254
255      pipe_resource_reference(&stImage->pt, pt);
256   }
257}
258