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
  40
  41 /**
  42  * Generate all the mipmap levels below the base level.
  43  * Note: this GL function would be more useful if one could specify a
  44  * cube face, a set of array slices, etc.
  45  */
  46 void GLAPIENTRY
  47 _mesa_GenerateMipmap(GLenum target)
  48 {
  49    struct gl_texture_image *srcImage;
  50    struct gl_texture_object *texObj;
  51    GLboolean error;
  52
  53    GET_CURRENT_CONTEXT(ctx);
  54
  55    FLUSH_VERTICES(ctx, 0);
  56
  57    switch (target) {
  58    case GL_TEXTURE_1D:
  59       error = _mesa_is_gles(ctx);
  60       break;
  61    case GL_TEXTURE_2D:
  62       error = GL_FALSE;
  63       break;
  64    case GL_TEXTURE_3D:
  65       error = ctx->API == API_OPENGLES;
  66       break;
  67    case GL_TEXTURE_CUBE_MAP:
  68       error = !ctx->Extensions.ARB_texture_cube_map;
  69       break;
  70    case GL_TEXTURE_1D_ARRAY:
  71       error = _mesa_is_gles(ctx) || !ctx->Extensions.EXT_texture_array;
  72       break;
  73    case GL_TEXTURE_2D_ARRAY:
  74       error = (_mesa_is_gles(ctx) && ctx->Version < 30)
  75          || !ctx->Extensions.EXT_texture_array;
  76       break;
  77    default:
  78       error = GL_TRUE;
  79    }
  80
  81    if (error) {
  82       _mesa_error(ctx, GL_INVALID_ENUM, "glGenerateMipmapEXT(target=%s)",
  83                   _mesa_lookup_enum_by_nr(target));
  84       return;
  85    }
  86
  87    texObj = _mesa_get_current_tex_object(ctx, target);
  88
  89    if (texObj->BaseLevel >= texObj->MaxLevel) {
  90       /* nothing to do */
  91       return;
  92    }
  93
  94    if (texObj->Target == GL_TEXTURE_CUBE_MAP &&
  95        !_mesa_cube_complete(texObj)) {
  96       _mesa_error(ctx, GL_INVALID_OPERATION,
  97                   "glGenerateMipmap(incomplete cube map)");
  98       return;
  99    }
 100
 101    _mesa_lock_texture(ctx, texObj);
 102
 103    srcImage = _mesa_select_tex_image(ctx, texObj, target, texObj->BaseLevel);
 104    if (!srcImage) {
 105       _mesa_unlock_texture(ctx, texObj);
 106       _mesa_error(ctx, GL_INVALID_OPERATION,
 107                   "glGenerateMipmap(zero size base image)");
 108       return;
 109    }
 110
 111    if (_mesa_is_enum_format_integer(srcImage->InternalFormat) ||
 112        _mesa_is_depthstencil_format(srcImage->InternalFormat) ||
 113        _mesa_is_stencil_format(srcImage->InternalFormat)) {
 114       _mesa_unlock_texture(ctx, texObj);
 115       _mesa_error(ctx, GL_INVALID_OPERATION,
 116                   "glGenerateMipmap(invalid internal format)");
 117       return;
 118    }
 119
 120    if (target == GL_TEXTURE_CUBE_MAP) {
 121       GLuint face;
 122       for (face = 0; face < 6; face++)
 123          ctx->Driver.GenerateMipmap(ctx,
 124                                     GL_TEXTURE_CUBE_MAP_POSITIVE_X_ARB + face,
 125                                     texObj);
 126    }
 127    else {
 128       ctx->Driver.GenerateMipmap(ctx, target, texObj);
 129    }
 130    _mesa_unlock_texture(ctx, texObj);
 131 }