src/mesa/main/genmipmap.c

   1 /*
   2  * Mesa 3-D graphics library
   3  *
   4  * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.
   5  * Copyright (C) 1999-2013  VMware, Inc.  All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included
  15  * in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  21  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  22  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  23  * OTHER DEALINGS IN THE SOFTWARE.
  24  */
  25
  26
  27 /*
  28  * glGenerateMipmap function
  29  */
  30
  31 #include "context.h"
  32 #include "enums.h"
  33 #include "genmipmap.h"
  34 #include "glformats.h"
  35 #include "macros.h"
  36 #include "mtypes.h"
  37 #include "teximage.h"
  38 #include "texobj.h"
  39 #include "hash.h"
  40
  41 /**
  42  * Implements glGenerateMipmap and glGenerateTextureMipmap.
  43  * Generates all the mipmap levels below the base level.
  44  */
  45 void
  46 _mesa_generate_texture_mipmap(struct gl_context *ctx,
  47                               struct gl_texture_object *texObj, GLenum target,
  48                               bool dsa)
  49 {
  50    struct gl_texture_image *srcImage;
  51    GLboolean error;
  52    const char *suffix = dsa ? "Texture" : "";
  53
  54    FLUSH_VERTICES(ctx, 0);
  55
  56    switch (target) {
  57    case GL_TEXTURE_1D:
  58       error = _mesa_is_gles(ctx);
  59       break;
  60    case GL_TEXTURE_2D:
  61       error = GL_FALSE;
  62       break;
  63    case GL_TEXTURE_3D:
  64       error = ctx->API == API_OPENGLES;
  65       break;
  66    case GL_TEXTURE_CUBE_MAP:
  67       error = !ctx->Extensions.ARB_texture_cube_map;
  68       break;
  69    case GL_TEXTURE_1D_ARRAY:
  70       error = _mesa_is_gles(ctx) || !ctx->Extensions.EXT_texture_array;
  71       break;
  72    case GL_TEXTURE_2D_ARRAY:
  73       error = (_mesa_is_gles(ctx) && ctx->Version < 30)
  74          || !ctx->Extensions.EXT_texture_array;
  75       break;
  76    case GL_TEXTURE_CUBE_MAP_ARRAY:
  77       error = _mesa_is_gles(ctx) ||
  78               !ctx->Extensions.ARB_texture_cube_map_array;
  79       break;
  80    default:
  81       error = GL_TRUE;
  82    }
  83
  84    if (error) {
  85       _mesa_error(ctx, GL_INVALID_ENUM, "glGenerate%sMipmap(target=%s)",
  86                   suffix, _mesa_enum_to_string(target));
  87       return;
  88    }
  89
  90    if (texObj->BaseLevel >= texObj->MaxLevel) {
  91       /* nothing to do */
  92       return;
  93    }
  94
  95    if (texObj->Target == GL_TEXTURE_CUBE_MAP &&
  96        !_mesa_cube_complete(texObj)) {
  97       _mesa_error(ctx, GL_INVALID_OPERATION,
  98                   "glGenerate%sMipmap(incomplete cube map)", suffix);
  99       return;
 100    }
 101
 102    _mesa_lock_texture(ctx, texObj);
 103
 104    srcImage = _mesa_select_tex_image(texObj, target, texObj->BaseLevel);
 105    if (!srcImage) {
 106       _mesa_unlock_texture(ctx, texObj);
 107       _mesa_error(ctx, GL_INVALID_OPERATION,
 108                   "glGenerate%sMipmap(zero size base image)", suffix);
 109       return;
 110    }
 111
 112    if (_mesa_is_enum_format_integer(srcImage->InternalFormat) ||
 113        _mesa_is_depthstencil_format(srcImage->InternalFormat) ||
 114        _mesa_is_astc_format(srcImage->InternalFormat) ||
 115        _mesa_is_stencil_format(srcImage->InternalFormat)) {
 116       _mesa_unlock_texture(ctx, texObj);
 117       _mesa_error(ctx, GL_INVALID_OPERATION,
 118                   "glGenerate%sMipmap(invalid internal format)", suffix);
 119       return;
 120    }
 121
 122    if (target == GL_TEXTURE_CUBE_MAP) {
 123       GLuint face;
 124       for (face = 0; face < 6; face++) {
 125          ctx->Driver.GenerateMipmap(ctx,
 126                       GL_TEXTURE_CUBE_MAP_POSITIVE_X_ARB + face, texObj);
 127       }
 128    }
 129    else {
 130       ctx->Driver.GenerateMipmap(ctx, target, texObj);
 131    }
 132    _mesa_unlock_texture(ctx, texObj);
 133 }
 134
 135 /**
 136  * Generate all the mipmap levels below the base level.
 137  * Note: this GL function would be more useful if one could specify a
 138  * cube face, a set of array slices, etc.
 139  */
 140 void GLAPIENTRY
 141 _mesa_GenerateMipmap(GLenum target)
 142 {
 143    struct gl_texture_object *texObj;
 144    GET_CURRENT_CONTEXT(ctx);
 145
 146    texObj = _mesa_get_current_tex_object(ctx, target);
 147    if (!texObj)
 148       return;
 149
 150    _mesa_generate_texture_mipmap(ctx, texObj, target, false);
 151 }
 152
 153 /**
 154  * Generate all the mipmap levels below the base level.
 155  */
 156 void GLAPIENTRY
 157 _mesa_GenerateTextureMipmap(GLuint texture)
 158 {
 159    struct gl_texture_object *texObj;
 160    GET_CURRENT_CONTEXT(ctx);
 161
 162    texObj = _mesa_lookup_texture_err(ctx, texture, "glGenerateTextureMipmap");
 163    if (!texObj)
 164       return;
 165
 166    _mesa_generate_texture_mipmap(ctx, texObj, texObj->Target, true);
 167 }