Mercurial > hg > orthanc-stone
annotate OrthancStone/Sources/Scene2D/Internals/OpenGLFloatTextureProgram.cpp @ 2129:169e2e586ef7 StoneWebViewer-2.2
closing StoneWebViewer-2.2
author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Thu, 30 May 2024 17:08:21 +0200 |
parents | 9ac2a65d4172 |
children | 3889ae96d2e9 |
rev | line source |
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591 | 1 /** |
2 * Stone of Orthanc | |
3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics | |
4 * Department, University Hospital of Liege, Belgium | |
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5 * Copyright (C) 2017-2021 Osimis S.A., Belgium |
591 | 6 * |
7 * This program is free software: you can redistribute it and/or | |
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8 * modify it under the terms of the GNU Lesser General Public License |
591 | 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 | |
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14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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15 * Lesser General Public License for more details. |
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16 * |
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17 * You should have received a copy of the GNU Lesser General Public |
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18 * License along with this program. If not, see |
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19 * <http://www.gnu.org/licenses/>. |
591 | 20 **/ |
21 | |
22 | |
23 #include "OpenGLFloatTextureProgram.h" | |
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24 #include "OpenGLShaderVersionDirective.h" |
591 | 25 |
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26 #include <OrthancException.h> |
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27 #include <Images/Image.h> |
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28 #include <Images/ImageProcessing.h> |
591 | 29 |
30 | |
31 static const char* FRAGMENT_SHADER = | |
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32 ORTHANC_STONE_OPENGL_SHADER_VERSION_DIRECTIVE |
771 | 33 "uniform float u_offset; \n" |
34 "uniform float u_slope; \n" | |
35 "uniform float u_windowCenter; \n" | |
36 "uniform float u_windowWidth; \n" | |
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37 "uniform bool u_invert; \n" |
771 | 38 "uniform sampler2D u_texture; \n" |
39 "varying vec2 v_texcoord; \n" | |
40 "void main() \n" | |
41 "{ \n" | |
42 " vec4 t = texture2D(u_texture, v_texcoord); \n" | |
43 " float v = (t.r * 256.0 + t.g) * 256.0; \n" | |
44 " v = v * u_slope + u_offset; \n" // (*) | |
45 " float a = u_windowCenter - u_windowWidth / 2.0; \n" | |
46 " float dy = 1.0 / u_windowWidth; \n" | |
47 " if (v <= a) \n" | |
48 " v = 0.0; \n" | |
49 " else \n" | |
50 " { \n" | |
51 " v = (v - a) * dy; \n" | |
52 " if (v >= 1.0) \n" | |
53 " v = 1.0; \n" | |
54 " } \n" | |
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55 " if (u_invert) \n" |
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56 " v = 1.0 - v; \n" |
771 | 57 " gl_FragColor = vec4(v, v, v, 1); \n" |
591 | 58 "}"; |
59 | |
60 | |
61 namespace OrthancStone | |
62 { | |
63 namespace Internals | |
64 { | |
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65 OpenGLFloatTextureProgram::Data::Data( |
1571 | 66 OpenGL::IOpenGLContext& context, |
67 const Orthanc::ImageAccessor& texture, | |
68 bool isLinearInterpolation) : | |
69 texture_(context), | |
70 offset_(0.0f), | |
71 slope_(0.0f) | |
591 | 72 { |
73 if (texture.GetFormat() != Orthanc::PixelFormat_Float32) | |
74 { | |
75 throw Orthanc::OrthancException(Orthanc::ErrorCode_IncompatibleImageFormat); | |
76 } | |
77 | |
78 float minValue, maxValue; | |
79 Orthanc::ImageProcessing::GetMinMaxFloatValue(minValue, maxValue, texture); | |
80 | |
81 offset_ = minValue; | |
82 | |
83 if (LinearAlgebra::IsCloseToZero(maxValue - minValue)) | |
84 { | |
85 slope_ = 1; | |
86 } | |
87 else | |
88 { | |
89 slope_ = (maxValue - minValue) / 65536.0f; | |
90 assert(!LinearAlgebra::IsCloseToZero(slope_)); | |
91 } | |
92 | |
93 const unsigned int width = texture.GetWidth(); | |
94 const unsigned int height = texture.GetHeight(); | |
95 | |
96 Orthanc::Image converted(Orthanc::PixelFormat_RGB24, width, height, true); | |
97 | |
98 for (unsigned int y = 0; y < height; y++) | |
99 { | |
100 const float *p = reinterpret_cast<const float*>(texture.GetConstRow(y)); | |
101 uint8_t *q = reinterpret_cast<uint8_t*>(converted.GetRow(y)); | |
102 | |
103 for (unsigned int x = 0; x < width; x++) | |
104 { | |
105 /** | |
106 * At (*), the floating-point "value" is reconstructed as | |
107 * "value = texture * slope + offset". | |
108 * <=> texture = (value - offset) / slope | |
109 **/ | |
110 | |
1571 | 111 float value = (*p - offset_) / slope_; |
112 if (value < 0) | |
591 | 113 { |
1571 | 114 value = 0; |
591 | 115 } |
1571 | 116 else if (value >= 65535.0f) |
591 | 117 { |
1571 | 118 value = 65535.0f; |
591 | 119 } |
120 | |
1571 | 121 uint16_t t = static_cast<uint16_t>(value); |
591 | 122 |
123 q[0] = t / 256; // red | |
124 q[1] = t % 256; // green | |
125 q[2] = 0; // blue is unused | |
126 | |
127 p++; | |
128 q += 3; | |
129 } | |
130 } | |
131 | |
132 texture_.Load(converted, isLinearInterpolation); | |
133 } | |
134 | |
135 | |
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136 OpenGLFloatTextureProgram::OpenGLFloatTextureProgram(OpenGL::IOpenGLContext& context) |
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137 : program_(context, FRAGMENT_SHADER) |
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138 , context_(context) |
592 | 139 { |
140 } | |
141 | |
142 | |
591 | 143 void OpenGLFloatTextureProgram::Apply(Data& data, |
144 const AffineTransform2D& transform, | |
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145 unsigned int canvasWidth, |
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146 unsigned int canvasHeight, |
591 | 147 float windowCenter, |
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148 float windowWidth, |
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149 bool invert) |
591 | 150 { |
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151 if (!context_.IsContextLost()) |
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152 { |
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153 OpenGLTextureProgram::Execution execution( |
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154 program_, data.GetTexture(), transform, canvasWidth, canvasHeight); |
591 | 155 |
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156 glUniform1f(execution.GetUniformLocation("u_slope"), data.GetSlope()); |
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157 glUniform1f(execution.GetUniformLocation("u_offset"), data.GetOffset()); |
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158 glUniform1f(execution.GetUniformLocation("u_windowCenter"), windowCenter); |
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159 glUniform1f(execution.GetUniformLocation("u_windowWidth"), windowWidth); |
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160 glUniform1f(execution.GetUniformLocation("u_invert"), invert); |
591 | 161 |
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162 execution.DrawTriangles(); |
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163 } |
591 | 164 } |
165 } | |
166 } |