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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 "ColorTextureOpenGLProgram.h"
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23
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24 namespace OrthancStone
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25 {
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26 namespace OpenGL
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27 {
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28 ColorTextureOpenGLProgram::ColorTextureOpenGLProgram(IOpenGLContext& context) :
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29 context_(context)
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30 {
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31 static const char* VERTEX_SHADER =
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32 "attribute vec2 a_texcoord; \n"
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33 "attribute vec4 a_position; \n"
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34 "uniform mat4 u_matrix; \n"
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35 "varying vec2 v_texcoord; \n"
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36 "void main() \n"
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37 "{ \n"
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38 " gl_Position = u_matrix * a_position; \n"
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39 " v_texcoord = a_texcoord; \n"
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40 "}";
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41
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42 static const char* FRAGMENT_SHADER =
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43 "uniform sampler2D u_texture; \n"
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44 "varying vec2 v_texcoord; \n"
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45 "void main() \n"
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46 "{ \n"
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47 " gl_FragColor = texture2D(u_texture, v_texcoord); \n"
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48 "}";
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49
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50 static const float POSITIONS[COMPONENTS * COUNT] = {
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51 0, 0,
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52 0, 1,
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53 1, 0,
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54 1, 0,
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55 0, 1,
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56 1, 1
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57 };
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58
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59 context_.MakeCurrent();
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60
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61 program_.reset(new OpenGLProgram);
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62 program_->CompileShaders(VERTEX_SHADER, FRAGMENT_SHADER);
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63
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64 positionLocation_ = program_->GetAttributeLocation("a_position");
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65 textureLocation_ = program_->GetAttributeLocation("a_texcoord");
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66
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67 glGenBuffers(2, buffers_);
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68
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69 glBindBuffer(GL_ARRAY_BUFFER, buffers_[0]);
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70 glBufferData(GL_ARRAY_BUFFER, sizeof(float) * COMPONENTS * COUNT, POSITIONS, GL_STATIC_DRAW);
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71
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72 glBindBuffer(GL_ARRAY_BUFFER, buffers_[1]);
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73 glBufferData(GL_ARRAY_BUFFER, sizeof(float) * COMPONENTS * COUNT, POSITIONS, GL_STATIC_DRAW);
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74 }
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75
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76
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77 ColorTextureOpenGLProgram::~ColorTextureOpenGLProgram()
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78 {
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79 context_.MakeCurrent();
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80 glDeleteBuffers(2, buffers_);
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81 }
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82
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83
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84 void ColorTextureOpenGLProgram::Apply(OpenGLTexture& texture,
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85 const AffineTransform2D& transform,
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86 bool useAlpha)
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87 {
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88 context_.MakeCurrent();
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89 program_->Use();
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90
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91 AffineTransform2D scale = AffineTransform2D::CreateScaling
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92 (texture.GetWidth(), texture.GetHeight());
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93
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94 AffineTransform2D t = AffineTransform2D::Combine(transform, scale);
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95
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96 float m[16];
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97 t.ConvertToOpenGLMatrix(m, context_.GetCanvasWidth(), context_.GetCanvasHeight());
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98
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99 texture.Bind(program_->GetUniformLocation("u_texture"));
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100 glUniformMatrix4fv(program_->GetUniformLocation("u_matrix"), 1, GL_FALSE, m);
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101
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102 glBindBuffer(GL_ARRAY_BUFFER, buffers_[0]);
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103 glEnableVertexAttribArray(positionLocation_);
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104 glVertexAttribPointer(positionLocation_, COMPONENTS, GL_FLOAT, GL_FALSE, 0, 0);
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105
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106 glBindBuffer(GL_ARRAY_BUFFER, buffers_[1]);
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107 glEnableVertexAttribArray(textureLocation_);
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108 glVertexAttribPointer(textureLocation_, COMPONENTS, GL_FLOAT, GL_FALSE, 0, 0);
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109
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110 if (useAlpha)
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111 {
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112 glEnable(GL_BLEND);
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113 glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
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114 glDrawArrays(GL_TRIANGLES, 0, COUNT);
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115 glDisable(GL_BLEND);
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116 }
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117 else
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118 {
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119 glDrawArrays(GL_TRIANGLES, 0, COUNT);
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120 }
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121
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122 glDisableVertexAttribArray(positionLocation_);
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123 glDisableVertexAttribArray(textureLocation_);
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124 }
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125 }
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126 }
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