st/mesa: fix mipmap image size computation w.r.t. texture arrays
[mesa.git] / src / mesa / state_tracker / st_gen_mipmap.c
1 /**************************************************************************
2 *
3 * Copyright 2008 Tungsten Graphics, Inc., Cedar Park, Texas.
4 * All Rights Reserved.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sub license, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
13 *
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
16 * of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
21 * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
22 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
23 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
24 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
25 *
26 **************************************************************************/
27
28
29 #include "main/imports.h"
30 #include "main/mipmap.h"
31 #include "main/teximage.h"
32
33 #include "pipe/p_context.h"
34 #include "pipe/p_defines.h"
35 #include "util/u_inlines.h"
36 #include "util/u_format.h"
37 #include "util/u_gen_mipmap.h"
38
39 #include "st_debug.h"
40 #include "st_context.h"
41 #include "st_texture.h"
42 #include "st_gen_mipmap.h"
43 #include "st_cb_texture.h"
44
45
46 /**
47 * one-time init for generate mipmap
48 * XXX Note: there may be other times we need no-op/simple state like this.
49 * In that case, some code refactoring would be good.
50 */
51 void
52 st_init_generate_mipmap(struct st_context *st)
53 {
54 st->gen_mipmap = util_create_gen_mipmap(st->pipe, st->cso_context);
55 }
56
57
58 void
59 st_destroy_generate_mipmap(struct st_context *st)
60 {
61 util_destroy_gen_mipmap(st->gen_mipmap);
62 st->gen_mipmap = NULL;
63 }
64
65
66 /**
67 * Generate mipmap levels using hardware rendering.
68 * \return TRUE if successful, FALSE if not possible
69 */
70 static boolean
71 st_render_mipmap(struct st_context *st,
72 GLenum target,
73 struct st_texture_object *stObj,
74 uint baseLevel, uint lastLevel)
75 {
76 struct pipe_context *pipe = st->pipe;
77 struct pipe_screen *screen = pipe->screen;
78 struct pipe_sampler_view *psv;
79 const uint face = _mesa_tex_target_to_face(target);
80
81 #if 0
82 assert(target != GL_TEXTURE_3D); /* implemented but untested */
83 #endif
84
85 /* check if we can render in the texture's format */
86 /* XXX should probably kill this and always use util_gen_mipmap
87 since this implements a sw fallback as well */
88 if (!screen->is_format_supported(screen, stObj->pt->format,
89 stObj->pt->target,
90 0, PIPE_BIND_RENDER_TARGET)) {
91 return FALSE;
92 }
93
94 psv = st_create_texture_sampler_view(pipe, stObj->pt);
95
96 /* Disable conditional rendering. */
97 if (st->render_condition) {
98 pipe->render_condition(pipe, NULL, 0);
99 }
100
101 util_gen_mipmap(st->gen_mipmap, psv, face, baseLevel, lastLevel,
102 PIPE_TEX_FILTER_LINEAR);
103
104 if (st->render_condition) {
105 pipe->render_condition(pipe, st->render_condition, st->condition_mode);
106 }
107
108 pipe_sampler_view_reference(&psv, NULL);
109
110 return TRUE;
111 }
112
113 /**
114 * Compute the expected number of mipmap levels in the texture given
115 * the width/height/depth of the base image and the GL_TEXTURE_BASE_LEVEL/
116 * GL_TEXTURE_MAX_LEVEL settings. This will tell us how many mipmap
117 * levels should be generated.
118 */
119 static GLuint
120 compute_num_levels(struct gl_context *ctx,
121 struct gl_texture_object *texObj,
122 GLenum target)
123 {
124 if (target == GL_TEXTURE_RECTANGLE_ARB) {
125 return 1;
126 }
127 else {
128 const struct gl_texture_image *baseImage =
129 _mesa_get_tex_image(ctx, texObj, target, texObj->BaseLevel);
130 GLuint size, numLevels;
131
132 size = MAX2(baseImage->Width2, baseImage->Height2);
133 size = MAX2(size, baseImage->Depth2);
134
135 numLevels = texObj->BaseLevel;
136
137 while (size > 0) {
138 numLevels++;
139 size >>= 1;
140 }
141
142 numLevels = MIN2(numLevels, texObj->MaxLevel + 1);
143
144 assert(numLevels >= 1);
145
146 return numLevels;
147 }
148 }
149
150
151 /**
152 * Called via ctx->Driver.GenerateMipmap().
153 */
154 void
155 st_generate_mipmap(struct gl_context *ctx, GLenum target,
156 struct gl_texture_object *texObj)
157 {
158 struct st_context *st = st_context(ctx);
159 struct st_texture_object *stObj = st_texture_object(texObj);
160 struct pipe_resource *pt = st_get_texobj_resource(texObj);
161 const uint baseLevel = texObj->BaseLevel;
162 uint lastLevel;
163 uint dstLevel;
164
165 if (!pt)
166 return;
167
168 /* not sure if this ultimately actually should work,
169 but we're not supporting multisampled textures yet. */
170 assert(pt->nr_samples < 2);
171
172 /* find expected last mipmap level to generate*/
173 lastLevel = compute_num_levels(ctx, texObj, target) - 1;
174
175 if (lastLevel == 0)
176 return;
177
178 /* The texture isn't in a "complete" state yet so set the expected
179 * lastLevel here, since it won't get done in st_finalize_texture().
180 */
181 stObj->lastLevel = lastLevel;
182
183 if (pt->last_level < lastLevel) {
184 /* The current gallium texture doesn't have space for all the
185 * mipmap levels we need to generate. So allocate a new texture.
186 */
187 struct pipe_resource *oldTex = stObj->pt;
188
189 /* create new texture with space for more levels */
190 stObj->pt = st_texture_create(st,
191 oldTex->target,
192 oldTex->format,
193 lastLevel,
194 oldTex->width0,
195 oldTex->height0,
196 oldTex->depth0,
197 oldTex->array_size,
198 oldTex->bind);
199
200 /* This will copy the old texture's base image into the new texture
201 * which we just allocated.
202 */
203 st_finalize_texture(ctx, st->pipe, texObj);
204
205 /* release the old tex (will likely be freed too) */
206 pipe_resource_reference(&oldTex, NULL);
207 pipe_sampler_view_reference(&stObj->sampler_view, NULL);
208 }
209 else {
210 /* Make sure that the base texture image data is present in the
211 * texture buffer.
212 */
213 st_finalize_texture(ctx, st->pipe, texObj);
214 }
215
216 pt = stObj->pt;
217
218 assert(pt->last_level >= lastLevel);
219
220 /* Try to generate the mipmap by rendering/texturing. If that fails,
221 * use the software fallback.
222 */
223 if (!st_render_mipmap(st, target, stObj, baseLevel, lastLevel)) {
224 /* since the util code actually also has a fallback, should
225 probably make it never fail and kill this */
226 _mesa_generate_mipmap(ctx, target, texObj);
227 }
228
229 /* Fill in the Mesa gl_texture_image fields */
230 for (dstLevel = baseLevel + 1; dstLevel <= lastLevel; dstLevel++) {
231 const uint srcLevel = dstLevel - 1;
232 const struct gl_texture_image *srcImage
233 = _mesa_get_tex_image(ctx, texObj, target, srcLevel);
234 struct gl_texture_image *dstImage;
235 struct st_texture_image *stImage;
236 uint border = srcImage->Border;
237 uint dstWidth, dstHeight, dstDepth;
238
239 dstWidth = u_minify(pt->width0, dstLevel);
240 if (texObj->Target == GL_TEXTURE_1D_ARRAY) {
241 dstHeight = pt->array_size;
242 }
243 else {
244 dstHeight = u_minify(pt->height0, dstLevel);
245 }
246 if (texObj->Target == GL_TEXTURE_2D_ARRAY) {
247 dstDepth = pt->array_size;
248 }
249 else {
250 dstDepth = u_minify(pt->depth0, dstLevel);
251 }
252
253 dstImage = _mesa_get_tex_image(ctx, texObj, target, dstLevel);
254 if (!dstImage) {
255 _mesa_error(ctx, GL_OUT_OF_MEMORY, "generating mipmaps");
256 return;
257 }
258
259 /* Free old image data */
260 ctx->Driver.FreeTextureImageBuffer(ctx, dstImage);
261
262 /* initialize new image */
263 _mesa_init_teximage_fields(ctx, dstImage, dstWidth, dstHeight,
264 dstDepth, border, srcImage->InternalFormat,
265 srcImage->TexFormat);
266
267 stImage = st_texture_image(dstImage);
268
269 pipe_resource_reference(&stImage->pt, pt);
270 }
271 }