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 bool
  42 _mesa_is_valid_generate_texture_mipmap_target(struct gl_context *ctx,
  43                                               GLenum target)
  44 {
  45    GLboolean error;
  46
  47    switch (target) {
  48    case GL_TEXTURE_1D:
  49       error = _mesa_is_gles(ctx);
  50       break;
  51    case GL_TEXTURE_2D:
  52       error = GL_FALSE;
  53       break;
  54    case GL_TEXTURE_3D:
  55       error = ctx->API == API_OPENGLES;
  56       break;
  57    case GL_TEXTURE_CUBE_MAP:
  58       error = !ctx->Extensions.ARB_texture_cube_map;
  59       break;
  60    case GL_TEXTURE_1D_ARRAY:
  61       error = _mesa_is_gles(ctx) || !ctx->Extensions.EXT_texture_array;
  62       break;
  63    case GL_TEXTURE_2D_ARRAY:
  64       error = (_mesa_is_gles(ctx) && ctx->Version < 30)
  65          || !ctx->Extensions.EXT_texture_array;
  66       break;
  67    case GL_TEXTURE_CUBE_MAP_ARRAY:
  68       error = _mesa_is_gles(ctx) ||
  69               !ctx->Extensions.ARB_texture_cube_map_array;
  70       break;
  71    default:
  72       error = GL_TRUE;
  73    }
  74
  75    return (error != GL_TRUE);
  76 }
  77
  78 bool
  79 _mesa_is_valid_generate_texture_mipmap_internalformat(struct gl_context *ctx,
  80                                                       GLenum internalformat)
  81 {
  82    return (!_mesa_is_enum_format_integer(internalformat) &&
  83            !_mesa_is_depthstencil_format(internalformat) &&
  84            !_mesa_is_astc_format(internalformat) &&
  85            !_mesa_is_stencil_format(internalformat));
  86 }
  87
  88 /**
  89  * Implements glGenerateMipmap and glGenerateTextureMipmap.
  90  * Generates all the mipmap levels below the base level.
  91  */
  92 void
  93 _mesa_generate_texture_mipmap(struct gl_context *ctx,
  94                               struct gl_texture_object *texObj, GLenum target,
  95                               bool dsa)
  96 {
  97    struct gl_texture_image *srcImage;
  98    const char *suffix = dsa ? "Texture" : "";
  99
 100    FLUSH_VERTICES(ctx, 0);
 101
 102    if (!_mesa_is_valid_generate_texture_mipmap_target(ctx, target)) {
 103       _mesa_error(ctx, GL_INVALID_ENUM, "glGenerate%sMipmap(target=%s)",
 104                   suffix, _mesa_enum_to_string(target));
 105       return;
 106    }
 107
 108    if (texObj->BaseLevel >= texObj->MaxLevel) {
 109       /* nothing to do */
 110       return;
 111    }
 112
 113    if (texObj->Target == GL_TEXTURE_CUBE_MAP &&
 114        !_mesa_cube_complete(texObj)) {
 115       _mesa_error(ctx, GL_INVALID_OPERATION,
 116                   "glGenerate%sMipmap(incomplete cube map)", suffix);
 117       return;
 118    }
 119
 120    _mesa_lock_texture(ctx, texObj);
 121
 122    srcImage = _mesa_select_tex_image(texObj, target, texObj->BaseLevel);
 123    if (!srcImage) {
 124       _mesa_unlock_texture(ctx, texObj);
 125       _mesa_error(ctx, GL_INVALID_OPERATION,
 126                   "glGenerate%sMipmap(zero size base image)", suffix);
 127       return;
 128    }
 129
 130    if (!_mesa_is_valid_generate_texture_mipmap_internalformat(ctx,
 131                                                               srcImage->InternalFormat)) {
 132       _mesa_unlock_texture(ctx, texObj);
 133       _mesa_error(ctx, GL_INVALID_OPERATION,
 134                   "glGenerate%sMipmap(invalid internal format)", suffix);
 135       return;
 136    }
 137
 138    if (target == GL_TEXTURE_CUBE_MAP) {
 139       GLuint face;
 140       for (face = 0; face < 6; face++) {
 141          ctx->Driver.GenerateMipmap(ctx,
 142                       GL_TEXTURE_CUBE_MAP_POSITIVE_X + face, texObj);
 143       }
 144    }
 145    else {
 146       ctx->Driver.GenerateMipmap(ctx, target, texObj);
 147    }
 148    _mesa_unlock_texture(ctx, texObj);
 149 }
 150
 151 /**
 152  * Generate all the mipmap levels below the base level.
 153  * Note: this GL function would be more useful if one could specify a
 154  * cube face, a set of array slices, etc.
 155  */
 156 void GLAPIENTRY
 157 _mesa_GenerateMipmap(GLenum target)
 158 {
 159    struct gl_texture_object *texObj;
 160    GET_CURRENT_CONTEXT(ctx);
 161
 162    texObj = _mesa_get_current_tex_object(ctx, target);
 163    if (!texObj)
 164       return;
 165
 166    _mesa_generate_texture_mipmap(ctx, texObj, target, false);
 167 }
 168
 169 /**
 170  * Generate all the mipmap levels below the base level.
 171  */
 172 void GLAPIENTRY
 173 _mesa_GenerateTextureMipmap(GLuint texture)
 174 {
 175    struct gl_texture_object *texObj;
 176    GET_CURRENT_CONTEXT(ctx);
 177
 178    texObj = _mesa_lookup_texture_err(ctx, texture, "glGenerateTextureMipmap");
 179    if (!texObj)
 180       return;
 181
 182    _mesa_generate_texture_mipmap(ctx, texObj, texObj->Target, true);
 183 }