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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 "OpenGLTextProgram.h"
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23
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24 #include "../../Fonts/OpenGLTextCoordinates.h"
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25
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26 #include <Core/OrthancException.h>
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27
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28
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29 static const unsigned int COMPONENTS = 2;
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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 "uniform vec3 u_color; \n"
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45 "varying vec2 v_texcoord; \n"
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46 "void main() \n"
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47 "{ \n"
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48 " vec4 v = texture2D(u_texture, v_texcoord); \n"
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49 " gl_FragColor = vec4(u_color * v.w, v.w); \n" // Premultiplied alpha
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50 "}";
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51
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52
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53 namespace OrthancStone
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54 {
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55 namespace Internals
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56 {
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57 OpenGLTextProgram::OpenGLTextProgram(OpenGL::IOpenGLContext& context) :
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58 context_(context)
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59 {
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60
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61 context_.MakeCurrent();
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62
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63 program_.reset(new OpenGL::OpenGLProgram);
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64 program_->CompileShaders(VERTEX_SHADER, FRAGMENT_SHADER);
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65
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66 positionLocation_ = program_->GetAttributeLocation("a_position");
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67 textureLocation_ = program_->GetAttributeLocation("a_texcoord");
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68 }
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69
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70
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71 OpenGLTextProgram::Data::Data(OpenGL::IOpenGLContext& context,
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72 const GlyphTextureAlphabet& alphabet,
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73 const TextSceneLayer& layer) :
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74 context_(context),
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75 red_(layer.GetRedAsFloat()),
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76 green_(layer.GetGreenAsFloat()),
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77 blue_(layer.GetBlueAsFloat()),
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78 x_(layer.GetX()),
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79 y_(layer.GetY()),
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80 border_(layer.GetBorder()),
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81 anchor_(layer.GetAnchor())
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82 {
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83 OpenGL::OpenGLTextCoordinates coordinates(alphabet, layer.GetText());
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84 textWidth_ = coordinates.GetTextWidth();
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85 textHeight_ = coordinates.GetTextHeight();
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86
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87 if (coordinates.IsEmpty())
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88 {
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89 coordinatesCount_ = 0;
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90 }
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91 else
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92 {
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93 coordinatesCount_ = coordinates.GetRenderingCoords().size();
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94
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95 context_.MakeCurrent();
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96 glGenBuffers(2, buffers_);
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97
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98 glBindBuffer(GL_ARRAY_BUFFER, buffers_[0]);
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99 glBufferData(GL_ARRAY_BUFFER, sizeof(float) * coordinatesCount_,
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100 &coordinates.GetRenderingCoords() [0], GL_STATIC_DRAW);
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101
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102 glBindBuffer(GL_ARRAY_BUFFER, buffers_[1]);
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103 glBufferData(GL_ARRAY_BUFFER, sizeof(float) * coordinatesCount_,
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104 &coordinates.GetTextureCoords() [0], GL_STATIC_DRAW);
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105 }
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106 }
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107
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108
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109 OpenGLTextProgram::Data::~Data()
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110 {
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111 if (!IsEmpty())
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112 {
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113 context_.MakeCurrent();
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114 glDeleteBuffers(2, buffers_);
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115 }
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116 }
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117
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118
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119 GLuint OpenGLTextProgram::Data::GetSceneLocationsBuffer() const
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120 {
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121 if (IsEmpty())
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122 {
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123 throw Orthanc::OrthancException(Orthanc::ErrorCode_BadSequenceOfCalls);
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124 }
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125 else
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126 {
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127 return buffers_[0];
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128 }
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129 }
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130
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131
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132 GLuint OpenGLTextProgram::Data::GetTextureLocationsBuffer() const
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133 {
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134 if (IsEmpty())
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135 {
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136 throw Orthanc::OrthancException(Orthanc::ErrorCode_BadSequenceOfCalls);
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137 }
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138 else
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139 {
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140 return buffers_[1];
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141 }
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142 }
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143
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144
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145 void OpenGLTextProgram::Apply(OpenGL::OpenGLTexture& fontTexture,
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146 const Data& data,
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147 const AffineTransform2D& transform)
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148 {
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149 if (!data.IsEmpty())
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150 {
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151 context_.MakeCurrent();
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152 program_->Use();
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153
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154 double dx, dy; // In pixels
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155 ComputeAnchorTranslation(dx, dy, data.GetAnchor(),
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156 data.GetTextWidth(), data.GetTextHeight(), data.GetBorder());
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157
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158 double x = data.GetX();
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159 double y = data.GetY();
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160 transform.Apply(x, y);
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161
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162 const AffineTransform2D t = AffineTransform2D::CreateOffset(x + dx, y + dy);
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163
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164 float m[16];
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165 t.ConvertToOpenGLMatrix(m, context_.GetCanvasWidth(), context_.GetCanvasHeight());
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166
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167 fontTexture.Bind(program_->GetUniformLocation("u_texture"));
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168 glUniformMatrix4fv(program_->GetUniformLocation("u_matrix"), 1, GL_FALSE, m);
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169 glUniform3f(program_->GetUniformLocation("u_color"),
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170 data.GetRed(), data.GetGreen(), data.GetBlue());
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171
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172 glBindBuffer(GL_ARRAY_BUFFER, data.GetSceneLocationsBuffer());
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173 glEnableVertexAttribArray(positionLocation_);
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174 glVertexAttribPointer(positionLocation_, COMPONENTS, GL_FLOAT, GL_FALSE, 0, 0);
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175
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176 glBindBuffer(GL_ARRAY_BUFFER, data.GetTextureLocationsBuffer());
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177 glEnableVertexAttribArray(textureLocation_);
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178 glVertexAttribPointer(textureLocation_, COMPONENTS, GL_FLOAT, GL_FALSE, 0, 0);
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179
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180 glEnable(GL_BLEND);
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181 glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
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182 glDrawArrays(GL_TRIANGLES, 0, data.GetCoordinatesCount() / COMPONENTS);
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183 glDisable(GL_BLEND);
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184
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185 glDisableVertexAttribArray(positionLocation_);
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186 glDisableVertexAttribArray(textureLocation_);
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187 }
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188 }
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189 }
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190 }
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