genmipmap.c revision 01e04c3f 
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
41bool
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_has_texture_cube_map_array(ctx);
69      break;
70   default:
71      error = true;
72   }
73
74   return !error;
75}
76
77bool
78_mesa_is_valid_generate_texture_mipmap_internalformat(struct gl_context *ctx,
79                                                      GLenum internalformat)
80{
81   if (_mesa_is_gles3(ctx)) {
82      /* From the ES 3.2 specification's description of GenerateMipmap():
83       * "An INVALID_OPERATION error is generated if the levelbase array was
84       *  not specified with an unsized internal format from table 8.3 or a
85       *  sized internal format that is both color-renderable and
86       *  texture-filterable according to table 8.10."
87       *
88       * GL_EXT_texture_format_BGRA8888 adds a GL_BGRA_EXT unsized internal
89       * format, and includes it in a very similar looking table.  So we
90       * include it here as well.
91       */
92      return internalformat == GL_RGBA || internalformat == GL_RGB ||
93             internalformat == GL_LUMINANCE_ALPHA ||
94             internalformat == GL_LUMINANCE || internalformat == GL_ALPHA ||
95             internalformat == GL_BGRA_EXT ||
96             (_mesa_is_es3_color_renderable(ctx, internalformat) &&
97              _mesa_is_es3_texture_filterable(ctx, internalformat));
98   }
99
100   return (!_mesa_is_enum_format_integer(internalformat) &&
101           !_mesa_is_depthstencil_format(internalformat) &&
102           !_mesa_is_astc_format(internalformat) &&
103           !_mesa_is_stencil_format(internalformat));
104}
105
106/**
107 * Implements glGenerateMipmap and glGenerateTextureMipmap.
108 * Generates all the mipmap levels below the base level.
109 */
110static ALWAYS_INLINE void
111generate_texture_mipmap(struct gl_context *ctx,
112                        struct gl_texture_object *texObj, GLenum target,
113                        bool dsa, bool no_error)
114{
115   struct gl_texture_image *srcImage;
116   const char *suffix = dsa ? "Texture" : "";
117
118   FLUSH_VERTICES(ctx, 0);
119
120   if (texObj->BaseLevel >= texObj->MaxLevel) {
121      /* nothing to do */
122      return;
123   }
124
125   if (!no_error && texObj->Target == GL_TEXTURE_CUBE_MAP &&
126       !_mesa_cube_complete(texObj)) {
127      _mesa_error(ctx, GL_INVALID_OPERATION,
128                  "glGenerate%sMipmap(incomplete cube map)", suffix);
129      return;
130   }
131
132   _mesa_lock_texture(ctx, texObj);
133
134   srcImage = _mesa_select_tex_image(texObj, target, texObj->BaseLevel);
135   if (!no_error) {
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
153   if (srcImage->Width == 0 || srcImage->Height == 0) {
154      _mesa_unlock_texture(ctx, texObj);
155      return;
156   }
157
158   if (target == GL_TEXTURE_CUBE_MAP) {
159      GLuint face;
160      for (face = 0; face < 6; face++) {
161         ctx->Driver.GenerateMipmap(ctx,
162                      GL_TEXTURE_CUBE_MAP_POSITIVE_X + face, texObj);
163      }
164   }
165   else {
166      ctx->Driver.GenerateMipmap(ctx, target, texObj);
167   }
168   _mesa_unlock_texture(ctx, texObj);
169}
170
171static void
172generate_texture_mipmap_error(struct gl_context *ctx,
173                              struct gl_texture_object *texObj, GLenum target,
174                              bool dsa)
175{
176   generate_texture_mipmap(ctx, texObj, target, dsa, false);
177}
178
179static void
180generate_texture_mipmap_no_error(struct gl_context *ctx,
181                                 struct gl_texture_object *texObj,
182                                 GLenum target, bool dsa)
183{
184   generate_texture_mipmap(ctx, texObj, target, dsa, true);
185}
186
187/**
188 * Generate all the mipmap levels below the base level.
189 * Note: this GL function would be more useful if one could specify a
190 * cube face, a set of array slices, etc.
191 */
192void GLAPIENTRY
193_mesa_GenerateMipmap_no_error(GLenum target)
194{
195   GET_CURRENT_CONTEXT(ctx);
196
197   struct gl_texture_object *texObj = _mesa_get_current_tex_object(ctx, target);
198   generate_texture_mipmap_no_error(ctx, texObj, target, false);
199}
200
201void GLAPIENTRY
202_mesa_GenerateMipmap(GLenum target)
203{
204   struct gl_texture_object *texObj;
205   GET_CURRENT_CONTEXT(ctx);
206
207   if (!_mesa_is_valid_generate_texture_mipmap_target(ctx, target)) {
208      _mesa_error(ctx, GL_INVALID_ENUM, "glGenerateMipmap(target=%s)",
209                  _mesa_enum_to_string(target));
210      return;
211   }
212
213   texObj = _mesa_get_current_tex_object(ctx, target);
214   if (!texObj)
215      return;
216
217   generate_texture_mipmap_error(ctx, texObj, target, false);
218}
219
220/**
221 * Generate all the mipmap levels below the base level.
222 */
223void GLAPIENTRY
224_mesa_GenerateTextureMipmap_no_error(GLuint texture)
225{
226   GET_CURRENT_CONTEXT(ctx);
227
228   struct gl_texture_object *texObj = _mesa_lookup_texture(ctx, texture);
229   generate_texture_mipmap_no_error(ctx, texObj, texObj->Target, true);
230}
231
232void GLAPIENTRY
233_mesa_GenerateTextureMipmap(GLuint texture)
234{
235   struct gl_texture_object *texObj;
236   GET_CURRENT_CONTEXT(ctx);
237
238   texObj = _mesa_lookup_texture_err(ctx, texture, "glGenerateTextureMipmap");
239   if (!texObj)
240      return;
241
242   if (!_mesa_is_valid_generate_texture_mipmap_target(ctx, texObj->Target)) {
243      _mesa_error(ctx, GL_INVALID_ENUM, "glGenerateTextureMipmap(target=%s)",
244                  _mesa_enum_to_string(texObj->Target));
245      return;
246   }
247
248   generate_texture_mipmap_error(ctx, texObj, texObj->Target, true);
249}
250