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
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  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
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  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  */
  51 void
  52 st_init_generate_mipmap(struct st_context *st)
  53 {
  54    st->gen_mipmap = util_create_gen_mipmap(st->pipe, st->cso_context);
  55 }
  56
  57
  58 void
  59 st_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  */
  70 static boolean
  71 st_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  */
 119 static GLuint
 120 compute_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  */
 140 void
 141 st_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 }