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585
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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 "TextOpenGLProgram.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 namespace OrthancStone
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30 {
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31 namespace OpenGL
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32 {
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33 TextOpenGLProgram::TextOpenGLProgram(IOpenGLContext& context) :
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34 context_(context)
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35 {
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36 static const char* VERTEX_SHADER =
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37 "attribute vec2 a_texcoord; \n"
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38 "attribute vec4 a_position; \n"
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39 "uniform mat4 u_matrix; \n"
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40 "varying vec2 v_texcoord; \n"
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41 "void main() \n"
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42 "{ \n"
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43 " gl_Position = u_matrix * a_position; \n"
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44 " v_texcoord = a_texcoord; \n"
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45 "}";
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46
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47 static const char* FRAGMENT_SHADER =
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48 "uniform sampler2D u_texture; \n"
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49 "uniform vec3 u_color; \n"
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50 "varying vec2 v_texcoord; \n"
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51 "void main() \n"
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52 "{ \n"
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53 " vec4 v = texture2D(u_texture, v_texcoord); \n"
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54 " gl_FragColor = vec4(u_color * v.w, v.w); \n" // Premultiplied alpha
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55 "}";
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56
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57 context_.MakeCurrent();
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58
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59 program_.reset(new OpenGLProgram);
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60 program_->CompileShaders(VERTEX_SHADER, FRAGMENT_SHADER);
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61
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62 positionLocation_ = program_->GetAttributeLocation("a_position");
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63 textureLocation_ = program_->GetAttributeLocation("a_texcoord");
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64 }
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65
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66
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67 TextOpenGLProgram::Data::Data(IOpenGLContext& context,
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68 const GlyphTextureAlphabet& alphabet,
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69 const TextSceneLayer& layer) :
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70 context_(context),
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71 red_(layer.GetRedAsFloat()),
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72 green_(layer.GetGreenAsFloat()),
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73 blue_(layer.GetBlueAsFloat()),
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74 x_(layer.GetX()),
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75 y_(layer.GetY()),
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76 border_(layer.GetBorder()),
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77 anchor_(layer.GetAnchor())
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78 {
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79 OpenGLTextCoordinates coordinates(alphabet, layer.GetText());
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80 textWidth_ = coordinates.GetTextWidth();
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81 textHeight_ = coordinates.GetTextHeight();
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82
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83 if (coordinates.IsEmpty())
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84 {
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85 coordinatesCount_ = 0;
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86 }
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87 else
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88 {
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89 coordinatesCount_ = coordinates.GetRenderingCoords().size();
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90
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91 context_.MakeCurrent();
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92 glGenBuffers(2, buffers_);
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93
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94 glBindBuffer(GL_ARRAY_BUFFER, buffers_[0]);
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95 glBufferData(GL_ARRAY_BUFFER, sizeof(float) * coordinatesCount_,
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96 &coordinates.GetRenderingCoords() [0], GL_STATIC_DRAW);
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97
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98 glBindBuffer(GL_ARRAY_BUFFER, buffers_[1]);
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99 glBufferData(GL_ARRAY_BUFFER, sizeof(float) * coordinatesCount_,
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100 &coordinates.GetTextureCoords() [0], GL_STATIC_DRAW);
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101 }
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102 }
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103
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104
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105 TextOpenGLProgram::Data::~Data()
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106 {
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107 if (!IsEmpty())
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108 {
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109 context_.MakeCurrent();
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110 glDeleteBuffers(2, buffers_);
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111 }
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112 }
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113
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114
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115 GLuint TextOpenGLProgram::Data::GetSceneLocationsBuffer() const
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116 {
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117 if (IsEmpty())
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118 {
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119 throw Orthanc::OrthancException(Orthanc::ErrorCode_BadSequenceOfCalls);
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120 }
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121 else
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122 {
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123 return buffers_[0];
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124 }
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125 }
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126
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127
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128 GLuint TextOpenGLProgram::Data::GetTextureLocationsBuffer() const
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129 {
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130 if (IsEmpty())
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131 {
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132 throw Orthanc::OrthancException(Orthanc::ErrorCode_BadSequenceOfCalls);
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133 }
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134 else
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135 {
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136 return buffers_[1];
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137 }
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138 }
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139
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140
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141 void TextOpenGLProgram::Apply(OpenGLTexture& fontTexture,
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142 const Data& data,
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143 const AffineTransform2D& transform)
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144 {
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145 if (!data.IsEmpty())
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146 {
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147 context_.MakeCurrent();
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148 program_->Use();
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149
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150 double dx, dy; // In pixels
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151 ComputeAnchorTranslation(dx, dy, data.GetAnchor(), data.GetTextWidth(), data.GetTextHeight(), data.GetBorder());
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152
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153 double x = data.GetX();
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154 double y = data.GetY();
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155 transform.Apply(x, y);
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156
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157 const AffineTransform2D t = AffineTransform2D::CreateOffset(x + dx, y + dy);
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158
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159 float m[16];
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160 t.ConvertToOpenGLMatrix(m, context_.GetCanvasWidth(), context_.GetCanvasHeight());
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161
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162 fontTexture.Bind(program_->GetUniformLocation("u_texture"));
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163 glUniformMatrix4fv(program_->GetUniformLocation("u_matrix"), 1, GL_FALSE, m);
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164 glUniform3f(program_->GetUniformLocation("u_color"),
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165 data.GetRed(), data.GetGreen(), data.GetBlue());
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166
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167 glBindBuffer(GL_ARRAY_BUFFER, data.GetSceneLocationsBuffer());
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168 glEnableVertexAttribArray(positionLocation_);
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169 glVertexAttribPointer(positionLocation_, COMPONENTS, GL_FLOAT, GL_FALSE, 0, 0);
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170
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171 glBindBuffer(GL_ARRAY_BUFFER, data.GetTextureLocationsBuffer());
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172 glEnableVertexAttribArray(textureLocation_);
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173 glVertexAttribPointer(textureLocation_, COMPONENTS, GL_FLOAT, GL_FALSE, 0, 0);
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174
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175 glEnable(GL_BLEND);
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176 glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
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177 glDrawArrays(GL_TRIANGLES, 0, data.GetCoordinatesCount() / COMPONENTS);
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178 glDisable(GL_BLEND);
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179
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180 glDisableVertexAttribArray(positionLocation_);
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181 glDisableVertexAttribArray(textureLocation_);
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182 }
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183 }
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184 }
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185 }
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