st_gen_mipmap.c revision e0304180c32227342dbb67b707bfae446543bb48 
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 = st_get_texture_sampler_view(stObj, pipe);
79   const uint face = _mesa_tex_target_to_face(target);
80
81   assert(psv->texture == stObj->pt);
82#if 0
83   assert(target != GL_TEXTURE_3D); /* implemented but untested */
84#endif
85
86   /* check if we can render in the texture's format */
87   /* XXX should probably kill this and always use util_gen_mipmap
88      since this implements a sw fallback as well */
89   if (!screen->is_format_supported(screen, psv->format, psv->texture->target,
90                                    0, PIPE_BIND_RENDER_TARGET)) {
91      return FALSE;
92   }
93
94   /* Disable conditional rendering. */
95   if (st->render_condition) {
96      pipe->render_condition(pipe, NULL, 0);
97   }
98
99   util_gen_mipmap(st->gen_mipmap, psv, face, baseLevel, lastLevel,
100                   PIPE_TEX_FILTER_LINEAR);
101
102   if (st->render_condition) {
103      pipe->render_condition(pipe, st->render_condition, st->condition_mode);
104   }
105
106   return TRUE;
107}
108
109/**
110 * Compute the expected number of mipmap levels in the texture given
111 * the width/height/depth of the base image and the GL_TEXTURE_BASE_LEVEL/
112 * GL_TEXTURE_MAX_LEVEL settings.  This will tell us how many mipmap
113 * levels should be generated.
114 */
115static GLuint
116compute_num_levels(struct gl_context *ctx,
117                   struct gl_texture_object *texObj,
118                   GLenum target)
119{
120   if (target == GL_TEXTURE_RECTANGLE_ARB) {
121      return 1;
122   }
123   else {
124      const struct gl_texture_image *baseImage =
125         _mesa_get_tex_image(ctx, texObj, target, texObj->BaseLevel);
126      GLuint size, numLevels;
127
128      size = MAX2(baseImage->Width2, baseImage->Height2);
129      size = MAX2(size, baseImage->Depth2);
130
131      numLevels = texObj->BaseLevel;
132
133      while (size > 0) {
134         numLevels++;
135         size >>= 1;
136      }
137
138      numLevels = MIN2(numLevels, texObj->MaxLevel + 1);
139
140      assert(numLevels >= 1);
141
142      return numLevels;
143   }
144}
145
146
147/**
148 * Called via ctx->Driver.GenerateMipmap().
149 */
150void
151st_generate_mipmap(struct gl_context *ctx, GLenum target,
152                   struct gl_texture_object *texObj)
153{
154   struct st_context *st = st_context(ctx);
155   struct st_texture_object *stObj = st_texture_object(texObj);
156   struct pipe_resource *pt = st_get_texobj_resource(texObj);
157   const uint baseLevel = texObj->BaseLevel;
158   uint lastLevel;
159   uint dstLevel;
160
161   if (!pt)
162      return;
163
164   /* not sure if this ultimately actually should work,
165      but we're not supporting multisampled textures yet. */
166   assert(pt->nr_samples < 2);
167
168   /* find expected last mipmap level to generate*/
169   lastLevel = compute_num_levels(ctx, texObj, target) - 1;
170
171   if (lastLevel == 0)
172      return;
173
174   /* The texture isn't in a "complete" state yet so set the expected
175    * lastLevel here, since it won't get done in st_finalize_texture().
176    */
177   stObj->lastLevel = lastLevel;
178
179   if (pt->last_level < lastLevel) {
180      /* The current gallium texture doesn't have space for all the
181       * mipmap levels we need to generate.  So allocate a new texture.
182       */
183      struct pipe_resource *oldTex = stObj->pt;
184
185      /* create new texture with space for more levels */
186      stObj->pt = st_texture_create(st,
187                                    oldTex->target,
188                                    oldTex->format,
189                                    lastLevel,
190                                    oldTex->width0,
191                                    oldTex->height0,
192                                    oldTex->depth0,
193                                    oldTex->array_size,
194                                    oldTex->bind);
195
196      /* This will copy the old texture's base image into the new texture
197       * which we just allocated.
198       */
199      st_finalize_texture(ctx, st->pipe, texObj);
200
201      /* release the old tex (will likely be freed too) */
202      pipe_resource_reference(&oldTex, NULL);
203      pipe_sampler_view_reference(&stObj->sampler_view, NULL);
204   }
205   else {
206      /* Make sure that the base texture image data is present in the
207       * texture buffer.
208       */
209      st_finalize_texture(ctx, st->pipe, texObj);
210   }
211
212   pt = stObj->pt;
213
214   assert(pt->last_level >= lastLevel);
215
216   /* Try to generate the mipmap by rendering/texturing.  If that fails,
217    * use the software fallback.
218    */
219   if (!st_render_mipmap(st, target, stObj, baseLevel, lastLevel)) {
220      /* since the util code actually also has a fallback, should
221         probably make it never fail and kill this */
222      _mesa_generate_mipmap(ctx, target, texObj);
223   }
224
225   /* Fill in the Mesa gl_texture_image fields */
226   for (dstLevel = baseLevel + 1; dstLevel <= lastLevel; dstLevel++) {
227      const uint srcLevel = dstLevel - 1;
228      const struct gl_texture_image *srcImage
229         = _mesa_get_tex_image(ctx, texObj, target, srcLevel);
230      struct gl_texture_image *dstImage;
231      struct st_texture_image *stImage;
232      uint dstWidth = u_minify(pt->width0, dstLevel);
233      uint dstHeight = u_minify(pt->height0, dstLevel);
234      uint dstDepth = u_minify(pt->depth0, dstLevel);
235      uint border = srcImage->Border;
236
237      dstImage = _mesa_get_tex_image(ctx, texObj, target, dstLevel);
238      if (!dstImage) {
239         _mesa_error(ctx, GL_OUT_OF_MEMORY, "generating mipmaps");
240         return;
241      }
242
243      /* Free old image data */
244      ctx->Driver.FreeTextureImageBuffer(ctx, dstImage);
245
246      /* initialize new image */
247      _mesa_init_teximage_fields(ctx, target, dstImage, dstWidth, dstHeight,
248                                 dstDepth, border, srcImage->InternalFormat,
249                                 srcImage->TexFormat);
250
251      stImage = st_texture_image(dstImage);
252
253      pipe_resource_reference(&stImage->pt, pt);
254   }
255}
256