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591
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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) 2017-2019 Osimis S.A., Belgium
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6 *
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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 Affero General Public License
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9 * as published by the Free Software Foundation, either version 3 of
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10 * the License, or (at your option) any later version.
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11 *
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12 * This program is distributed in the hope that it will be useful, but
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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 * Affero 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 Affero General Public License
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18 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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19 **/
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20
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21
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22 #include "OpenGLTextureProgram.h"
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23
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24 static const unsigned int COMPONENTS = 2;
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25 static const unsigned int COUNT = 6; // 2 triangles in 2D
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26
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27 static const char* VERTEX_SHADER =
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28 "attribute vec2 a_texcoord; \n"
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29 "attribute vec4 a_position; \n"
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30 "uniform mat4 u_matrix; \n"
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31 "varying vec2 v_texcoord; \n"
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32 "void main() \n"
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33 "{ \n"
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34 " gl_Position = u_matrix * a_position; \n"
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35 " v_texcoord = a_texcoord; \n"
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36 "}";
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37
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38
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39 namespace OrthancStone
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40 {
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41 namespace Internals
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42 {
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43 void OpenGLTextureProgram::InitializeExecution(OpenGL::OpenGLTexture& texture,
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44 const AffineTransform2D& transform)
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45 {
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46 context_.MakeCurrent();
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47 program_->Use();
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48
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49 AffineTransform2D scale = AffineTransform2D::CreateScaling
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50 (texture.GetWidth(), texture.GetHeight());
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51
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52 AffineTransform2D t = AffineTransform2D::Combine(transform, scale);
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53
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54 float m[16];
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55 t.ConvertToOpenGLMatrix(m, context_.GetCanvasWidth(), context_.GetCanvasHeight());
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56
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57 texture.Bind(program_->GetUniformLocation("u_texture"));
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58 glUniformMatrix4fv(program_->GetUniformLocation("u_matrix"), 1, GL_FALSE, m);
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59
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60 glBindBuffer(GL_ARRAY_BUFFER, buffers_[0]);
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61 glEnableVertexAttribArray(positionLocation_);
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62 glVertexAttribPointer(positionLocation_, COMPONENTS, GL_FLOAT, GL_FALSE, 0, 0);
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63
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64 glBindBuffer(GL_ARRAY_BUFFER, buffers_[1]);
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65 glEnableVertexAttribArray(textureLocation_);
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66 glVertexAttribPointer(textureLocation_, COMPONENTS, GL_FLOAT, GL_FALSE, 0, 0);
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67 }
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68
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69
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70 void OpenGLTextureProgram::FinalizeExecution()
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71 {
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72 glDisableVertexAttribArray(positionLocation_);
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73 glDisableVertexAttribArray(textureLocation_);
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74 }
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75
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76
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77 OpenGLTextureProgram::OpenGLTextureProgram(OpenGL::IOpenGLContext& context,
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78 const char* fragmentShader) :
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79 context_(context)
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80 {
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81 static const float POSITIONS[COMPONENTS * COUNT] = {
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82 0, 0,
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83 0, 1,
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84 1, 0,
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85 1, 0,
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86 0, 1,
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87 1, 1
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88 };
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89
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90 context_.MakeCurrent();
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91
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92 program_.reset(new OpenGL::OpenGLProgram);
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93 program_->CompileShaders(VERTEX_SHADER, fragmentShader);
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94
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95 positionLocation_ = program_->GetAttributeLocation("a_position");
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96 textureLocation_ = program_->GetAttributeLocation("a_texcoord");
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97
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98 glGenBuffers(2, buffers_);
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99
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100 glBindBuffer(GL_ARRAY_BUFFER, buffers_[0]);
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101 glBufferData(GL_ARRAY_BUFFER, sizeof(float) * COMPONENTS * COUNT, POSITIONS, GL_STATIC_DRAW);
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102
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103 glBindBuffer(GL_ARRAY_BUFFER, buffers_[1]);
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104 glBufferData(GL_ARRAY_BUFFER, sizeof(float) * COMPONENTS * COUNT, POSITIONS, GL_STATIC_DRAW);
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105 }
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106
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107
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108 OpenGLTextureProgram::~OpenGLTextureProgram()
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109 {
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110 context_.MakeCurrent();
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111 glDeleteBuffers(2, buffers_);
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112 }
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113
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114
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115 void OpenGLTextureProgram::Execution::DrawTriangles()
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116 {
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117 glDrawArrays(GL_TRIANGLES, 0, COUNT);
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118 }
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119 }
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120 }
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