1 /*
2 * Copyright © 2016 Intel Corporation
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
13 * Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
21 * IN THE SOFTWARE.
22 */
23
24 #include "main/mipmap.h"
25 #include "main/teximage.h"
26 #include "brw_blorp.h"
27 #include "brw_context.h"
28 #include "intel_tex.h"
29 #include "drivers/common/meta.h"
30
31 #define FILE_DEBUG_FLAG DEBUG_BLORP
32
33
34 /**
35 * The GenerateMipmap() driver hook.
36 */
37 void
brw_generate_mipmap(struct gl_context * ctx,GLenum target,struct gl_texture_object * tex_obj)38 brw_generate_mipmap(struct gl_context *ctx, GLenum target,
39 struct gl_texture_object *tex_obj)
40 {
41 struct brw_context *brw = brw_context(ctx);
42 struct gen_device_info *devinfo = &brw->screen->devinfo;
43 struct intel_texture_object *intel_obj = intel_texture_object(tex_obj);
44 const unsigned base_level = tex_obj->BaseLevel;
45 unsigned last_level, first_layer, last_layer;
46
47 /* Blorp doesn't handle combined depth/stencil surfaces on Gen4-5 yet. */
48 if (devinfo->gen <= 5 &&
49 (tex_obj->Image[0][base_level]->_BaseFormat == GL_DEPTH_COMPONENT ||
50 tex_obj->Image[0][base_level]->_BaseFormat == GL_DEPTH_STENCIL)) {
51 _mesa_meta_GenerateMipmap(ctx, target, tex_obj);
52 return;
53 }
54
55 /* find expected last mipmap level to generate */
56 last_level = _mesa_compute_num_levels(ctx, tex_obj, target) - 1;
57
58 if (last_level == 0)
59 return;
60
61 /* The texture isn't in a "complete" state yet so set the expected
62 * last_level here; we're not going through normal texture validation.
63 */
64 intel_obj->_MaxLevel = last_level;
65
66 if (!tex_obj->Immutable) {
67 _mesa_prepare_mipmap_levels(ctx, tex_obj, base_level, last_level);
68
69 /* At this point, memory for all the texture levels has been
70 * allocated. However, the base level image may be in one resource
71 * while the subsequent/smaller levels may be in another resource.
72 * Finalizing the texture will copy the base images from the former
73 * resource to the latter.
74 *
75 * After this, we'll have all mipmap levels in one resource.
76 */
77 intel_finalize_mipmap_tree(brw, tex_obj);
78 }
79
80 struct intel_mipmap_tree *mt = intel_obj->mt;
81 if (!mt) {
82 _mesa_error(ctx, GL_OUT_OF_MEMORY, "mipmap generation");
83 return;
84 }
85
86 const mesa_format format = intel_obj->_Format;
87
88 /* Fall back to the CPU for non-renderable cases.
89 *
90 * TODO: 3D textures require blending data from multiple slices,
91 * which means we need custom shaders. For now, fall back.
92 */
93 if (!brw->mesa_format_supports_render[format] || target == GL_TEXTURE_3D) {
94 _mesa_generate_mipmap(ctx, target, tex_obj);
95 return;
96 }
97
98 const struct isl_extent4d *base_size = &mt->surf.logical_level0_px;
99
100 if (mt->target == GL_TEXTURE_CUBE_MAP) {
101 first_layer = _mesa_tex_target_to_face(target);
102 last_layer = first_layer;
103 } else {
104 first_layer = 0;
105 last_layer = base_size->array_len - 1;
106 }
107
108 /* The GL_EXT_texture_sRGB_decode extension's issues section says:
109 *
110 * "10) How is mipmap generation of sRGB textures affected by the
111 * TEXTURE_SRGB_DECODE_EXT parameter?
112 *
113 * RESOLVED: When the TEXTURE_SRGB_DECODE parameter is DECODE_EXT
114 * for an sRGB texture, mipmap generation should decode sRGB texels
115 * to a linear RGB color space, perform downsampling, then encode
116 * back to an sRGB color space. (Issue 24 in the EXT_texture_sRGB
117 * specification provides a rationale for why.) When the parameter
118 * is SKIP_DECODE_EXT instead, mipmap generation skips the encode
119 * and decode steps during mipmap generation. By skipping the
120 * encode and decode steps, sRGB mipmap generation should match
121 * the mipmap generation for a non-sRGB texture."
122 */
123 bool do_srgb = tex_obj->Sampler.sRGBDecode == GL_DECODE_EXT;
124
125 for (unsigned dst_level = base_level + 1;
126 dst_level <= last_level;
127 dst_level++) {
128
129 const unsigned src_level = dst_level - 1;
130
131 for (unsigned layer = first_layer; layer <= last_layer; layer++) {
132 brw_blorp_blit_miptrees(brw, mt, src_level, layer, format,
133 SWIZZLE_XYZW, mt, dst_level, layer, format,
134 0, 0,
135 minify(base_size->width, src_level),
136 minify(base_size->height, src_level),
137 0, 0,
138 minify(base_size->width, dst_level),
139 minify(base_size->height, dst_level),
140 GL_LINEAR, false, false,
141 do_srgb, do_srgb);
142 }
143 }
144 }
145