1 /*
2 * Copyright (C) 2009 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26 #include "third_party/blink/renderer/modules/webgl/webgl_texture.h"
27
28 #include "gpu/command_buffer/client/gles2_interface.h"
29 #include "third_party/blink/renderer/modules/webgl/webgl_rendering_context_base.h"
30
31 namespace blink {
32
WebGLTexture(WebGLRenderingContextBase * ctx)33 WebGLTexture::WebGLTexture(WebGLRenderingContextBase* ctx)
34 : WebGLSharedPlatform3DObject(ctx), target_(0) {
35 GLuint texture;
36 ctx->ContextGL()->GenTextures(1, &texture);
37 SetObject(texture);
38 }
39
40 WebGLTexture::~WebGLTexture() = default;
41
SetTarget(GLenum target)42 void WebGLTexture::SetTarget(GLenum target) {
43 if (!Object())
44 return;
45 // Target is finalized the first time bindTexture() is called.
46 if (target_)
47 return;
48 target_ = target;
49 }
50
DeleteObjectImpl(gpu::gles2::GLES2Interface * gl)51 void WebGLTexture::DeleteObjectImpl(gpu::gles2::GLES2Interface* gl) {
52 gl->DeleteTextures(1, &object_);
53 object_ = 0;
54 }
55
MapTargetToIndex(GLenum target) const56 int WebGLTexture::MapTargetToIndex(GLenum target) const {
57 if (target_ == GL_TEXTURE_2D) {
58 if (target == GL_TEXTURE_2D)
59 return 0;
60 } else if (target_ == GL_TEXTURE_CUBE_MAP) {
61 switch (target) {
62 case GL_TEXTURE_CUBE_MAP_POSITIVE_X:
63 return 0;
64 case GL_TEXTURE_CUBE_MAP_NEGATIVE_X:
65 return 1;
66 case GL_TEXTURE_CUBE_MAP_POSITIVE_Y:
67 return 2;
68 case GL_TEXTURE_CUBE_MAP_NEGATIVE_Y:
69 return 3;
70 case GL_TEXTURE_CUBE_MAP_POSITIVE_Z:
71 return 4;
72 case GL_TEXTURE_CUBE_MAP_NEGATIVE_Z:
73 return 5;
74 }
75 } else if (target_ == GL_TEXTURE_3D) {
76 if (target == GL_TEXTURE_3D)
77 return 0;
78 } else if (target_ == GL_TEXTURE_2D_ARRAY) {
79 if (target == GL_TEXTURE_2D_ARRAY)
80 return 0;
81 }
82 return -1;
83 }
84
ComputeLevelCount(GLsizei width,GLsizei height,GLsizei depth)85 GLint WebGLTexture::ComputeLevelCount(GLsizei width,
86 GLsizei height,
87 GLsizei depth) {
88 // return 1 + log2Floor(std::max(width, height));
89 GLsizei n = std::max(std::max(width, height), depth);
90 if (n <= 0)
91 return 0;
92 GLint log = 0;
93 GLsizei value = n;
94 for (int ii = 4; ii >= 0; --ii) {
95 int shift = (1 << ii);
96 GLsizei x = (value >> shift);
97 if (x) {
98 value = x;
99 log += shift;
100 }
101 }
102 DCHECK_EQ(value, 1);
103 return log + 1;
104 }
105
106 } // namespace blink
107