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annotate OrthancStone/Sources/Scene2D/Internals/OpenGLTextureProgram.cpp @ 1870:3889ae96d2e9

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added copyright UCLouvain
author Sebastien Jodogne <s.jodogne@gmail.com>
date Tue, 11 Jan 2022 11:04:09 +0100
parents 9ac2a65d4172
children 7053b8a0aaec
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1 /**
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2 * Stone of Orthanc
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3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
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4 * Department, University Hospital of Liege, Belgium
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5 * Copyright (C) 2017-2021 Osimis S.A., Belgium
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6 * Copyright (C) 2021-2021 Sebastien Jodogne, ICTEAM UCLouvain, Belgium
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7 *
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8 * This program is free software: you can redistribute it and/or
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9 * modify it under the terms of the GNU Lesser General Public License
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10 * as published by the Free Software Foundation, either version 3 of
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11 * the License, or (at your option) any later version.
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12 *
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13 * This program is distributed in the hope that it will be useful, but
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14 * WITHOUT ANY WARRANTY; without even the implied warranty of
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15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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16 * Lesser General Public License for more details.
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17 *
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18 * You should have received a copy of the GNU Lesser General Public
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19 * License along with this program. If not, see
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20 * <http://www.gnu.org/licenses/>.
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21 **/
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22
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24 #include "OpenGLTextureProgram.h"
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25 #include "OpenGLShaderVersionDirective.h"
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26
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27 #include <OrthancException.h>
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28
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29 static const unsigned int COMPONENTS = 2;
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30 static const unsigned int COUNT = 6; // 2 triangles in 2D
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31
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32 static const char* VERTEX_SHADER =
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33 ORTHANC_STONE_OPENGL_SHADER_VERSION_DIRECTIVE
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34 "attribute vec2 a_texcoord; \n"
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35 "attribute vec4 a_position; \n"
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36 "uniform mat4 u_matrix; \n"
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37 "varying vec2 v_texcoord; \n"
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38 "void main() \n"
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39 "{ \n"
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40 " gl_Position = u_matrix * a_position; \n"
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41 " v_texcoord = a_texcoord; \n"
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42 "}";
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43
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44
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45 namespace OrthancStone
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46 {
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47 namespace Internals
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48 {
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49 void OpenGLTextureProgram::InitializeExecution(OpenGL::OpenGLTexture& texture,
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50 const AffineTransform2D& transform,
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51 unsigned int canvasWidth,
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52 unsigned int canvasHeight)
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53 {
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54 if (!context_.IsContextLost())
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55 {
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56 context_.MakeCurrent();
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57 program_->Use();
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58
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59 AffineTransform2D scale = AffineTransform2D::CreateScaling
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60 (texture.GetWidth(), texture.GetHeight());
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61
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62 AffineTransform2D t = AffineTransform2D::Combine(transform, scale);
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64 float m[16];
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65 t.ConvertToOpenGLMatrix(m, canvasWidth, canvasHeight);
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66
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67 texture.Bind(program_->GetUniformLocation("u_texture"));
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68 glUniformMatrix4fv(program_->GetUniformLocation("u_matrix"), 1, GL_FALSE, m);
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69
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70 glBindBuffer(GL_ARRAY_BUFFER, buffers_[0]);
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71 glEnableVertexAttribArray(positionLocation_);
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72 glVertexAttribPointer(positionLocation_, COMPONENTS, GL_FLOAT, GL_FALSE, 0, 0);
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73
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74 glBindBuffer(GL_ARRAY_BUFFER, buffers_[1]);
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75 glEnableVertexAttribArray(textureLocation_);
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76 glVertexAttribPointer(textureLocation_, COMPONENTS, GL_FLOAT, GL_FALSE, 0, 0);
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77 }
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78 }
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79
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80 void OpenGLTextureProgram::FinalizeExecution()
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81 {
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82 if (!context_.IsContextLost())
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83 {
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84 glDisableVertexAttribArray(positionLocation_);
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85 glDisableVertexAttribArray(textureLocation_);
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86 }
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87 }
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88
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89 OpenGLTextureProgram::OpenGLTextureProgram(OpenGL::IOpenGLContext& context,
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90 const char* fragmentShader) :
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91 context_(context)
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92 {
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93 static const float POSITIONS[COMPONENTS * COUNT] = {
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94 0, 0,
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95 0, 1,
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96 1, 0,
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97 1, 0,
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98 0, 1,
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99 1, 1
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100 };
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101
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102 if (!context_.IsContextLost())
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103 {
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104 context_.MakeCurrent();
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105
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106 program_.reset(new OpenGL::OpenGLProgram(context_));
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107 program_->CompileShaders(VERTEX_SHADER, fragmentShader);
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108
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109 positionLocation_ = program_->GetAttributeLocation("a_position");
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110 textureLocation_ = program_->GetAttributeLocation("a_texcoord");
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111
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112 glGenBuffers(2, buffers_);
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113
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114 glBindBuffer(GL_ARRAY_BUFFER, buffers_[0]);
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115 glBufferData(GL_ARRAY_BUFFER, sizeof(float) * COMPONENTS * COUNT, POSITIONS, GL_STATIC_DRAW);
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116
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117 glBindBuffer(GL_ARRAY_BUFFER, buffers_[1]);
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118 glBufferData(GL_ARRAY_BUFFER, sizeof(float) * COMPONENTS * COUNT, POSITIONS, GL_STATIC_DRAW);
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119 }
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120 }
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121
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122 OpenGLTextureProgram::~OpenGLTextureProgram()
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123 {
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124 if (!context_.IsContextLost())
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125 {
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126 ORTHANC_OPENGL_TRACE_CURRENT_CONTEXT("OpenGLTextureProgram::~OpenGLTextureProgram() | About to call glDeleteBuffers");
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127 context_.MakeCurrent();
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128 glDeleteBuffers(2, buffers_);
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129 }
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130 }
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132
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133 void OpenGLTextureProgram::Execution::DrawTriangles()
b66ced2c43d4 OpenGLTextureProgram
Sebastien Jodogne <s.jodogne@gmail.com>
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134 {
947
1091b2adeb5a Fixed animation frame stopping when returning false + big work on the OpenGL
Benjamin Golinvaux <bgo@osimis.io>
parents: 611
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135 if (!that_.context_.IsContextLost())
1091b2adeb5a Fixed animation frame stopping when returning false + big work on the OpenGL
Benjamin Golinvaux <bgo@osimis.io>
parents: 611
diff changeset
136 {
1091b2adeb5a Fixed animation frame stopping when returning false + big work on the OpenGL
Benjamin Golinvaux <bgo@osimis.io>
parents: 611
diff changeset
137 glDrawArrays(GL_TRIANGLES, 0, COUNT);
1091b2adeb5a Fixed animation frame stopping when returning false + big work on the OpenGL
Benjamin Golinvaux <bgo@osimis.io>
parents: 611
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138 }
591
b66ced2c43d4 OpenGLTextureProgram
Sebastien Jodogne <s.jodogne@gmail.com>
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139 }
b66ced2c43d4 OpenGLTextureProgram
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
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140 }
b66ced2c43d4 OpenGLTextureProgram
Sebastien Jodogne <s.jodogne@gmail.com>
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141 }