src/mesa/state_tracker/st_gen_mipmap.c

   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/macros.h"
  31 #include "main/mipmap.h"
  32 #include "main/teximage.h"
  33 #include "main/texformat.h"
  34
  35 #include "shader/prog_instruction.h"
  36
  37 #include "pipe/p_context.h"
  38 #include "pipe/p_defines.h"
  39 #include "pipe/p_inlines.h"
  40 #include "util/u_gen_mipmap.h"
  41
  42 #include "cso_cache/cso_cache.h"
  43 #include "cso_cache/cso_context.h"
  44
  45 #include "st_context.h"
  46 #include "st_draw.h"
  47 #include "st_gen_mipmap.h"
  48 #include "st_program.h"
  49 #include "st_texture.h"
  50 #include "st_cb_texture.h"
  51 #include "st_inlines.h"
  52
  53
  54 /**
  55  * one-time init for generate mipmap
  56  * XXX Note: there may be other times we need no-op/simple state like this.
  57  * In that case, some code refactoring would be good.
  58  */
  59 void
  60 st_init_generate_mipmap(struct st_context *st)
  61 {
  62    st->gen_mipmap = util_create_gen_mipmap(st->pipe, st->cso_context);
  63 }
  64
  65
  66 void
  67 st_destroy_generate_mipmap(struct st_context *st)
  68 {
  69    util_destroy_gen_mipmap(st->gen_mipmap);
  70    st->gen_mipmap = NULL;
  71 }
  72
  73
  74 /**
  75  * Generate mipmap levels using hardware rendering.
  76  * \return TRUE if successful, FALSE if not possible
  77  */
  78 static boolean
  79 st_render_mipmap(struct st_context *st,
  80                  GLenum target,
  81                  struct pipe_texture *pt,
  82                  uint baseLevel, uint lastLevel)
  83 {
  84    struct pipe_context *pipe = st->pipe;
  85    struct pipe_screen *screen = pipe->screen;
  86    const uint face = _mesa_tex_target_to_face(target);
  87
  88    assert(target != GL_TEXTURE_3D); /* not done yet */
  89
  90    /* check if we can render in the texture's format */
  91    if (!screen->is_format_supported(screen, pt->format, pt->target,
  92                                     PIPE_TEXTURE_USAGE_RENDER_TARGET, 0)) {
  93       return FALSE;
  94    }
  95
  96    util_gen_mipmap(st->gen_mipmap, pt, face, baseLevel, lastLevel,
  97                    PIPE_TEX_FILTER_LINEAR);
  98
  99    return TRUE;
 100 }
 101
 102
 103 static void
 104 fallback_generate_mipmap(GLcontext *ctx, GLenum target,
 105                          struct gl_texture_object *texObj)
 106 {
 107    struct pipe_context *pipe = ctx->st->pipe;
 108    struct pipe_screen *screen = pipe->screen;
 109    struct pipe_texture *pt = st_get_texobj_texture(texObj);
 110    const uint baseLevel = texObj->BaseLevel;
 111    const uint lastLevel = pt->last_level;
 112    const uint face = _mesa_tex_target_to_face(target), zslice = 0;
 113    uint dstLevel;
 114    GLenum datatype;
 115    GLuint comps;
 116
 117    assert(target != GL_TEXTURE_3D); /* not done yet */
 118
 119    _mesa_format_to_type_and_comps(texObj->Image[face][baseLevel]->TexFormat,
 120                                   &datatype, &comps);
 121
 122    for (dstLevel = baseLevel + 1; dstLevel <= lastLevel; dstLevel++) {
 123       const uint srcLevel = dstLevel - 1;
 124       struct pipe_transfer *srcTrans, *dstTrans;
 125       const ubyte *srcData;
 126       ubyte *dstData;
 127       int srcStride, dstStride;
 128
 129       srcTrans = st_cond_flush_get_tex_transfer(st_context(ctx), pt, face,
 130                                                 srcLevel, zslice,
 131                                                 PIPE_TRANSFER_READ, 0, 0,
 132                                                 pt->width[srcLevel],
 133                                                 pt->height[srcLevel]);
 134
 135       dstTrans = st_cond_flush_get_tex_transfer(st_context(ctx), pt, face,
 136                                                 dstLevel, zslice,
 137                                                 PIPE_TRANSFER_WRITE, 0, 0,
 138                                                 pt->width[dstLevel],
 139                                                 pt->height[dstLevel]);
 140
 141       srcData = (ubyte *) screen->transfer_map(screen, srcTrans);
 142       dstData = (ubyte *) screen->transfer_map(screen, dstTrans);
 143
 144       srcStride = srcTrans->stride / srcTrans->block.size;
 145       dstStride = dstTrans->stride / dstTrans->block.size;
 146
 147       _mesa_generate_mipmap_level(target, datatype, comps,
 148                    0 /*border*/,
 149                    pt->width[srcLevel], pt->height[srcLevel], pt->depth[srcLevel],
 150                    srcData,
 151                    srcStride, /* stride in texels */
 152                    pt->width[dstLevel], pt->height[dstLevel], pt->depth[dstLevel],
 153                    dstData,
 154                    dstStride); /* stride in texels */
 155
 156       screen->transfer_unmap(screen, srcTrans);
 157       screen->transfer_unmap(screen, dstTrans);
 158
 159       screen->tex_transfer_destroy(srcTrans);
 160       screen->tex_transfer_destroy(dstTrans);
 161    }
 162 }
 163
 164
 165 /**
 166  * Compute the expected number of mipmap levels in the texture given
 167  * the width/height/depth of the base image and the GL_TEXTURE_BASE_LEVEL/
 168  * GL_TEXTURE_MAX_LEVEL settings.  This will tell us how many mipmap
 169  * level should be generated.
 170  */
 171 static GLuint
 172 compute_num_levels(GLcontext *ctx,
 173                    struct gl_texture_object *texObj,
 174                    GLenum target)
 175 {
 176    if (target == GL_TEXTURE_RECTANGLE_ARB) {
 177       return 1;
 178    }
 179    else {
 180       const GLuint maxLevels = texObj->MaxLevel - texObj->BaseLevel + 1;
 181       const struct gl_texture_image *baseImage =
 182          _mesa_get_tex_image(ctx, texObj, target, texObj->BaseLevel);
 183       GLuint size, numLevels;
 184
 185       size = MAX2(baseImage->Width2, baseImage->Height2);
 186       size = MAX2(size, baseImage->Depth2);
 187
 188       numLevels = 0;
 189
 190       while (size > 0) {
 191          numLevels++;
 192          size >>= 1;
 193       }
 194
 195       numLevels = MIN2(numLevels, maxLevels);
 196
 197       return numLevels;
 198    }
 199 }
 200
 201
 202 void
 203 st_generate_mipmap(GLcontext *ctx, GLenum target,
 204                    struct gl_texture_object *texObj)
 205 {
 206    struct st_context *st = ctx->st;
 207    struct pipe_texture *pt = st_get_texobj_texture(texObj);
 208    const uint baseLevel = texObj->BaseLevel;
 209    uint lastLevel;
 210    uint dstLevel;
 211
 212    if (!pt)
 213       return;
 214
 215    /* find expected last mipmap level */
 216    lastLevel = compute_num_levels(ctx, texObj, target) - 1;
 217
 218    if (lastLevel == 0)
 219       return;
 220
 221    if (pt->last_level < lastLevel) {
 222       /* The current gallium texture doesn't have space for all the
 223        * mipmap levels we need to generate.  So allocate a new texture.
 224        */
 225       struct st_texture_object *stObj = st_texture_object(texObj);
 226       struct pipe_texture *oldTex = stObj->pt;
 227       GLboolean needFlush;
 228
 229       /* create new texture with space for more levels */
 230       stObj->pt = st_texture_create(st,
 231                                     oldTex->target,
 232                                     oldTex->format,
 233                                     lastLevel,
 234                                     oldTex->width[0],
 235                                     oldTex->height[0],
 236                                     oldTex->depth[0],
 237                                     oldTex->tex_usage);
 238
 239       /* The texture isn't in a "complete" state yet so set the expected
 240        * lastLevel here, since it won't get done in st_finalize_texture().
 241        */
 242       stObj->lastLevel = lastLevel;
 243
 244       /* This will copy the old texture's base image into the new texture
 245        * which we just allocated.
 246        */
 247       st_finalize_texture(ctx, st->pipe, texObj, &needFlush);
 248
 249       /* release the old tex (will likely be freed too) */
 250       pipe_texture_reference(&oldTex, NULL);
 251
 252       pt = stObj->pt;
 253    }
 254
 255    assert(lastLevel <= pt->last_level);
 256
 257    /* Recall that the Mesa BaseLevel image is stored in the gallium
 258     * texture's level[0] position.  So pass baseLevel=0 here.
 259     */
 260    if (!st_render_mipmap(st, target, pt, 0, lastLevel)) {
 261       fallback_generate_mipmap(ctx, target, texObj);
 262    }
 263
 264    /* Fill in the Mesa gl_texture_image fields */
 265    for (dstLevel = baseLevel + 1; dstLevel <= lastLevel; dstLevel++) {
 266       const uint srcLevel = dstLevel - 1;
 267       const struct gl_texture_image *srcImage
 268          = _mesa_get_tex_image(ctx, texObj, target, srcLevel);
 269       struct gl_texture_image *dstImage;
 270       struct st_texture_image *stImage;
 271       uint dstWidth = pt->width[dstLevel];
 272       uint dstHeight = pt->height[dstLevel];
 273       uint dstDepth = pt->depth[dstLevel];
 274       uint border = srcImage->Border;
 275
 276       dstImage = _mesa_get_tex_image(ctx, texObj, target, dstLevel);
 277       if (!dstImage) {
 278          _mesa_error(ctx, GL_OUT_OF_MEMORY, "generating mipmaps");
 279          return;
 280       }
 281
 282       /* Free old image data */
 283       if (dstImage->Data)
 284          ctx->Driver.FreeTexImageData(ctx, dstImage);
 285
 286       /* initialize new image */
 287       _mesa_init_teximage_fields(ctx, target, dstImage, dstWidth, dstHeight,
 288                                  dstDepth, border, srcImage->InternalFormat);
 289
 290       dstImage->TexFormat = srcImage->TexFormat;
 291
 292       stImage = (struct st_texture_image *) dstImage;
 293       pipe_texture_reference(&stImage->pt, pt);
 294    }
 295 }