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comparison Framework/OpenGL/OpenGLTexture.cpp @ 579:fadacfbf5538

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OpenGL programs and textures
author Sebastien Jodogne <s.jodogne@gmail.com>
date Fri, 19 Apr 2019 16:06:45 +0200
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children 97926984d5d0
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578:21fd70df3fc9 579:fadacfbf5538
1 /**
2 * Stone of Orthanc
3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
4 * Department, University Hospital of Liege, Belgium
5 * Copyright (C) 2017-2019 Osimis S.A., Belgium
6 *
7 * This program is free software: you can redistribute it and/or
8 * modify it under the terms of the GNU Affero General Public License
9 * as published by the Free Software Foundation, either version 3 of
10 * the License, or (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Affero General Public License for more details.
16 *
17 * You should have received a copy of the GNU Affero General Public License
18 * along with this program. If not, see <http://www.gnu.org/licenses/>.
19 **/
20
21
22 #include "OpenGLTexture.h"
23
24 #include <Core/OrthancException.h>
25
26 namespace OrthancStone
27 {
28 namespace OpenGL
29 {
30 OpenGLTexture::OpenGLTexture() :
31 width_(0),
32 height_(0)
33 {
34 // Generate a texture object
35 glGenTextures(1, &texture_);
36 if (texture_ == 0)
37 {
38 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError,
39 "Cannot create an OpenGL program");
40 }
41 }
42
43
44 OpenGLTexture::~OpenGLTexture()
45 {
46 assert(texture_ != 0);
47 glDeleteTextures(1, &texture_);
48 }
49
50
51 void OpenGLTexture::Load(const Orthanc::ImageAccessor& image,
52 bool isLinearInterpolation)
53 {
54 glPixelStorei(GL_UNPACK_ALIGNMENT, 1); // Disable byte-alignment restriction
55
56 if (image.GetPitch() != image.GetBytesPerPixel() * image.GetWidth())
57 {
58 throw Orthanc::OrthancException(Orthanc::ErrorCode_NotImplemented,
59 "Unsupported non-zero padding");
60 }
61
62 // Bind it
63 glActiveTexture(GL_TEXTURE0);
64 glBindTexture(GL_TEXTURE_2D, texture_);
65
66 GLenum sourceFormat, internalFormat;
67
68 switch (image.GetFormat())
69 {
70 case Orthanc::PixelFormat_Grayscale8:
71 sourceFormat = GL_RED;
72 internalFormat = GL_RED;
73 break;
74
75 case Orthanc::PixelFormat_RGB24:
76 sourceFormat = GL_RGB;
77 internalFormat = GL_RGBA;
78 break;
79
80 case Orthanc::PixelFormat_RGBA32:
81 sourceFormat = GL_RGBA;
82 internalFormat = GL_RGBA;
83 break;
84
85 default:
86 throw Orthanc::OrthancException(Orthanc::ErrorCode_NotImplemented,
87 "No support for this format in OpenGL textures: " +
88 std::string(EnumerationToString(image.GetFormat())));
89 }
90
91 width_ = image.GetWidth();
92 height_ = image.GetHeight();
93
94 GLint interpolation = (isLinearInterpolation ? GL_LINEAR : GL_NEAREST);
95
96 // Load the texture from the image buffer
97 glTexImage2D(GL_TEXTURE_2D, 0, internalFormat, image.GetWidth(), image.GetHeight(),
98 0, sourceFormat, GL_UNSIGNED_BYTE, image.GetBuffer());
99 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, interpolation);
100 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, interpolation);
101 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
102 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
103 }
104
105
106 void OpenGLTexture::Bind(GLint location)
107 {
108 glActiveTexture(GL_TEXTURE0);
109 glBindTexture(GL_TEXTURE_2D, texture_);
110 glUniform1i(location, 0 /* texture unit */);
111 }
112 }
113 }