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    bool 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 = 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 = true;
  73    }
  74
  75    return !error;
  76 }
  77
  78 bool
  79 _mesa_is_valid_generate_texture_mipmap_internalformat(struct gl_context *ctx,
  80                                                       GLenum internalformat)
  81 {
  82    if (_mesa_is_gles3(ctx)) {
  83       /* From the ES 3.2 specification's description of GenerateMipmap():
  84        * "An INVALID_OPERATION error is generated if the levelbase array was
  85        *  not specified with an unsized internal format from table 8.3 or a
  86        *  sized internal format that is both color-renderable and
  87        *  texture-filterable according to table 8.10."
  88        *
  89        * GL_EXT_texture_format_BGRA8888 adds a GL_BGRA_EXT unsized internal
  90        * format, and includes it in a very similar looking table.  So we
  91        * include it here as well.
  92        */
  93       return internalformat == GL_RGBA || internalformat == GL_RGB ||
  94              internalformat == GL_LUMINANCE_ALPHA ||
  95              internalformat == GL_LUMINANCE || internalformat == GL_ALPHA ||
  96              internalformat == GL_BGRA_EXT ||
  97              (_mesa_is_es3_color_renderable(internalformat) &&
  98               _mesa_is_es3_texture_filterable(ctx, internalformat));
  99    }
 100
 101    return (!_mesa_is_enum_format_integer(internalformat) &&
 102            !_mesa_is_depthstencil_format(internalformat) &&
 103            !_mesa_is_astc_format(internalformat) &&
 104            !_mesa_is_stencil_format(internalformat));
 105 }
 106
 107 /**
 108  * Implements glGenerateMipmap and glGenerateTextureMipmap.
 109  * Generates all the mipmap levels below the base level.
 110  */
 111 void
 112 _mesa_generate_texture_mipmap(struct gl_context *ctx,
 113                               struct gl_texture_object *texObj, GLenum target,
 114                               bool dsa)
 115 {
 116    struct gl_texture_image *srcImage;
 117    const char *suffix = dsa ? "Texture" : "";
 118
 119    FLUSH_VERTICES(ctx, 0);
 120
 121    if (texObj->BaseLevel >= texObj->MaxLevel) {
 122       /* nothing to do */
 123       return;
 124    }
 125
 126    if (texObj->Target == GL_TEXTURE_CUBE_MAP &&
 127        !_mesa_cube_complete(texObj)) {
 128       _mesa_error(ctx, GL_INVALID_OPERATION,
 129                   "glGenerate%sMipmap(incomplete cube map)", suffix);
 130       return;
 131    }
 132
 133    _mesa_lock_texture(ctx, texObj);
 134
 135    srcImage = _mesa_select_tex_image(texObj, target, texObj->BaseLevel);
 136    if (!srcImage) {
 137       _mesa_unlock_texture(ctx, texObj);
 138       _mesa_error(ctx, GL_INVALID_OPERATION,
 139                   "glGenerate%sMipmap(zero size base image)", suffix);
 140       return;
 141    }
 142
 143    if (!_mesa_is_valid_generate_texture_mipmap_internalformat(ctx,
 144                                                               srcImage->InternalFormat)) {
 145       _mesa_unlock_texture(ctx, texObj);
 146       _mesa_error(ctx, GL_INVALID_OPERATION,
 147                   "glGenerate%sMipmap(invalid internal format %s)", suffix,
 148                   _mesa_enum_to_string(srcImage->InternalFormat));
 149       return;
 150    }
 151
 152    if (srcImage->Width == 0 || srcImage->Height == 0) {
 153       _mesa_unlock_texture(ctx, texObj);
 154       return;
 155    }
 156
 157    if (target == GL_TEXTURE_CUBE_MAP) {
 158       GLuint face;
 159       for (face = 0; face < 6; face++) {
 160          ctx->Driver.GenerateMipmap(ctx,
 161                       GL_TEXTURE_CUBE_MAP_POSITIVE_X + face, texObj);
 162       }
 163    }
 164    else {
 165       ctx->Driver.GenerateMipmap(ctx, target, texObj);
 166    }
 167    _mesa_unlock_texture(ctx, texObj);
 168 }
 169
 170 /**
 171  * Generate all the mipmap levels below the base level.
 172  * Note: this GL function would be more useful if one could specify a
 173  * cube face, a set of array slices, etc.
 174  */
 175 void GLAPIENTRY
 176 _mesa_GenerateMipmap(GLenum target)
 177 {
 178    struct gl_texture_object *texObj;
 179    GET_CURRENT_CONTEXT(ctx);
 180
 181    if (!_mesa_is_valid_generate_texture_mipmap_target(ctx, target)) {
 182       _mesa_error(ctx, GL_INVALID_ENUM, "glGenerateMipmap(target=%s)",
 183                   _mesa_enum_to_string(target));
 184       return;
 185    }
 186
 187    texObj = _mesa_get_current_tex_object(ctx, target);
 188    if (!texObj)
 189       return;
 190
 191    _mesa_generate_texture_mipmap(ctx, texObj, target, false);
 192 }
 193
 194 /**
 195  * Generate all the mipmap levels below the base level.
 196  */
 197 void GLAPIENTRY
 198 _mesa_GenerateTextureMipmap(GLuint texture)
 199 {
 200    struct gl_texture_object *texObj;
 201    GET_CURRENT_CONTEXT(ctx);
 202
 203    texObj = _mesa_lookup_texture_err(ctx, texture, "glGenerateTextureMipmap");
 204    if (!texObj)
 205       return;
 206
 207    if (!_mesa_is_valid_generate_texture_mipmap_target(ctx, texObj->Target)) {
 208       _mesa_error(ctx, GL_INVALID_ENUM, "glGenerateTextureMipmap(target=%s)",
 209                   _mesa_enum_to_string(texObj->Target));
 210       return;
 211    }
 212
 213    _mesa_generate_texture_mipmap(ctx, texObj, texObj->Target, true);
 214 }