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comparison OrthancStone/Sources/Scene2D/Internals/OpenGLTextProgram.cpp @ 1512:244ad1e4e76a

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reorganization of folders
author Sebastien Jodogne <s.jodogne@gmail.com>
date Tue, 07 Jul 2020 16:21:02 +0200
parents Framework/Scene2D/Internals/OpenGLTextProgram.cpp@30deba7bc8e2
children 92fca2b3ba3d
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1511:9dfeee74c1e6 1512:244ad1e4e76a
1 /**
2 * Stone of Orthanc
3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
4 * Department, University Hospital of Liege, Belgium
5 * Copyright (C) 2017-2020 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 "OpenGLTextProgram.h"
23 #include "OpenGLShaderVersionDirective.h"
24
25 #include "../../Fonts/OpenGLTextCoordinates.h"
26
27 #include <OrthancException.h>
28
29
30 static const unsigned int COMPONENTS = 2;
31
32 static const char* VERTEX_SHADER =
33 ORTHANC_STONE_OPENGL_SHADER_VERSION_DIRECTIVE
34 "attribute vec2 a_texcoord; \n"
35 "attribute vec4 a_position; \n"
36 "uniform mat4 u_matrix; \n"
37 "varying vec2 v_texcoord; \n"
38 "void main() \n"
39 "{ \n"
40 " gl_Position = u_matrix * a_position; \n"
41 " v_texcoord = a_texcoord; \n"
42 "}";
43
44 static const char* FRAGMENT_SHADER =
45 ORTHANC_STONE_OPENGL_SHADER_VERSION_DIRECTIVE
46 "uniform sampler2D u_texture; \n"
47 "uniform vec3 u_color; \n"
48 "varying vec2 v_texcoord; \n"
49 "void main() \n"
50 "{ \n"
51 " vec4 v = texture2D(u_texture, v_texcoord); \n"
52 " gl_FragColor = vec4(u_color * v.w, v.w); \n" // Premultiplied alpha
53 "}";
54
55
56 namespace OrthancStone
57 {
58 namespace Internals
59 {
60 OpenGLTextProgram::OpenGLTextProgram(OpenGL::IOpenGLContext& context) :
61 context_(context)
62 {
63 if (!context_.IsContextLost())
64 {
65 context_.MakeCurrent();
66
67 program_.reset(new OpenGL::OpenGLProgram(context_));
68 program_->CompileShaders(VERTEX_SHADER, FRAGMENT_SHADER);
69
70 positionLocation_ = program_->GetAttributeLocation("a_position");
71 textureLocation_ = program_->GetAttributeLocation("a_texcoord");
72 }
73 }
74
75
76 OpenGLTextProgram::Data::Data(OpenGL::IOpenGLContext& context,
77 const GlyphTextureAlphabet& alphabet,
78 const TextSceneLayer& layer) :
79 context_(context),
80 red_(layer.GetColor().GetRedAsFloat()),
81 green_(layer.GetColor().GetGreenAsFloat()),
82 blue_(layer.GetColor().GetBlueAsFloat()),
83 x_(layer.GetX()),
84 y_(layer.GetY()),
85 border_(layer.GetBorder()),
86 anchor_(layer.GetAnchor())
87 {
88 OpenGL::OpenGLTextCoordinates coordinates(alphabet, layer.GetText());
89 textWidth_ = coordinates.GetTextWidth();
90 textHeight_ = coordinates.GetTextHeight();
91
92 if (coordinates.IsEmpty())
93 {
94 coordinatesCount_ = 0;
95 }
96 else
97 {
98 coordinatesCount_ = coordinates.GetRenderingCoords().size();
99
100 if (!context_.IsContextLost())
101 {
102 context_.MakeCurrent();
103 glGenBuffers(2, buffers_);
104 ORTHANC_OPENGL_CHECK("glGenBuffers");
105
106 glBindBuffer(GL_ARRAY_BUFFER, buffers_[0]);
107 ORTHANC_OPENGL_CHECK("glBindBuffer");
108 glBufferData(GL_ARRAY_BUFFER, sizeof(float) * coordinatesCount_,
109 &coordinates.GetRenderingCoords()[0], GL_STATIC_DRAW);
110 ORTHANC_OPENGL_CHECK("glBufferData");
111
112 glBindBuffer(GL_ARRAY_BUFFER, buffers_[1]);
113 ORTHANC_OPENGL_CHECK("glBindBuffer");
114 glBufferData(GL_ARRAY_BUFFER, sizeof(float) * coordinatesCount_,
115 &coordinates.GetTextureCoords()[0], GL_STATIC_DRAW);
116 ORTHANC_OPENGL_CHECK("glBufferData");
117 }
118 }
119 }
120
121
122 OpenGLTextProgram::Data::~Data()
123 {
124 if (!context_.IsContextLost() && !IsEmpty())
125 {
126 try
127 {
128 context_.MakeCurrent();
129 ORTHANC_OPENGL_TRACE_CURRENT_CONTEXT("About to call glDeleteBuffers");
130 glDeleteBuffers(2, buffers_);
131 ORTHANC_OPENGL_CHECK("glDeleteBuffers");
132 }
133 catch (const Orthanc::OrthancException& e)
134 {
135 if (e.HasDetails())
136 {
137 LOG(ERROR) << "OrthancException in ~Data: " << e.What() << " Details: " << e.GetDetails();
138 }
139 else
140 {
141 LOG(ERROR) << "OrthancException in ~Data: " << e.What();
142 }
143 }
144 catch (const std::exception& e)
145 {
146 LOG(ERROR) << "std::exception in ~Data: " << e.what();
147 }
148 catch (...)
149 {
150 LOG(ERROR) << "Unknown exception in ~Data";
151 }
152 }
153 }
154
155
156 GLuint OpenGLTextProgram::Data::GetSceneLocationsBuffer() const
157 {
158 if (IsEmpty())
159 {
160 LOG(ERROR) << "OpenGLTextProgram::Data::GetSceneLocationsBuffer(): (IsEmpty())";
161 throw Orthanc::OrthancException(Orthanc::ErrorCode_BadSequenceOfCalls);
162 }
163 else
164 {
165 return buffers_[0];
166 }
167 }
168
169 GLuint OpenGLTextProgram::Data::GetTextureLocationsBuffer() const
170 {
171 if (IsEmpty())
172 {
173 LOG(ERROR) << "OpenGLTextProgram::Data::GetTextureLocationsBuffer(): (IsEmpty())";
174 throw Orthanc::OrthancException(Orthanc::ErrorCode_BadSequenceOfCalls);
175 }
176 else
177 {
178 return buffers_[1];
179 }
180 }
181
182 void OpenGLTextProgram::Apply(OpenGL::OpenGLTexture& fontTexture,
183 const Data& data,
184 const AffineTransform2D& transform)
185 {
186 if (!context_.IsContextLost() && !data.IsEmpty())
187 {
188 context_.MakeCurrent();
189 program_->Use();
190
191 double dx, dy; // In pixels
192 ComputeAnchorTranslation(dx, dy, data.GetAnchor(),
193 data.GetTextWidth(), data.GetTextHeight(),
194 static_cast<unsigned int>(data.GetBorder()));
195
196 double x = data.GetX();
197 double y = data.GetY();
198 transform.Apply(x, y);
199
200 const AffineTransform2D t = AffineTransform2D::CreateOffset(x + dx, y + dy);
201
202 float m[16];
203 t.ConvertToOpenGLMatrix(m, context_.GetCanvasWidth(), context_.GetCanvasHeight());
204
205 fontTexture.Bind(program_->GetUniformLocation("u_texture"));
206 glUniformMatrix4fv(program_->GetUniformLocation("u_matrix"), 1, GL_FALSE, m);
207 glUniform3f(program_->GetUniformLocation("u_color"),
208 data.GetRed(), data.GetGreen(), data.GetBlue());
209
210 glBindBuffer(GL_ARRAY_BUFFER, data.GetSceneLocationsBuffer());
211 glEnableVertexAttribArray(positionLocation_);
212 glVertexAttribPointer(positionLocation_, COMPONENTS, GL_FLOAT, GL_FALSE, 0, 0);
213
214 glBindBuffer(GL_ARRAY_BUFFER, data.GetTextureLocationsBuffer());
215 glEnableVertexAttribArray(textureLocation_);
216 glVertexAttribPointer(textureLocation_, COMPONENTS, GL_FLOAT, GL_FALSE, 0, 0);
217
218 glEnable(GL_BLEND);
219 glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
220 glDrawArrays(GL_TRIANGLES, 0,
221 static_cast<GLsizei>(data.GetCoordinatesCount() / COMPONENTS));
222 glDisable(GL_BLEND);
223
224 glDisableVertexAttribArray(positionLocation_);
225 glDisableVertexAttribArray(textureLocation_);
226 }
227 }
228 }
229 }