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annotate DPF-Prymula-audioplugins/dpf/dgl/OpenGL.hpp @ 3:84e66ea83026

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DPF-Prymula-audioplugins-0.231015-2
author prymula <prymula76@outlook.com>
date Mon, 16 Oct 2023 21:53:34 +0200
parents
children
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3
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1 /*
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2 * DISTRHO Plugin Framework (DPF)
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3 * Copyright (C) 2012-2022 Filipe Coelho <falktx@falktx.com>
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4 *
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5 * Permission to use, copy, modify, and/or distribute this software for any purpose with
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6 * or without fee is hereby granted, provided that the above copyright notice and this
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7 * permission notice appear in all copies.
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8 *
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9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD
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10 * TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN
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11 * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
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12 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
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13 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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14 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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15 */
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16
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17 #ifndef DGL_OPENGL_HPP_INCLUDED
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18 #define DGL_OPENGL_HPP_INCLUDED
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19
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20 #include "ImageBase.hpp"
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21 #include "ImageBaseWidgets.hpp"
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22
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23 #include "OpenGL-include.hpp"
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24
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25 START_NAMESPACE_DGL
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26
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27 // -----------------------------------------------------------------------
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28
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29 /**
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30 OpenGL Graphics context.
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31 */
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32 struct OpenGLGraphicsContext : GraphicsContext
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33 {
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34 #ifdef DGL_USE_OPENGL3
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35 #endif
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36 };
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37
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38 // -----------------------------------------------------------------------
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39
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40 static inline
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41 ImageFormat asDISTRHOImageFormat(const GLenum format)
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42 {
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43 switch (format)
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44 {
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45 #ifdef DGL_USE_OPENGL3
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46 case GL_RED:
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47 #else
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48 case GL_LUMINANCE:
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49 #endif
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50 return kImageFormatGrayscale;
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51 case GL_BGR:
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52 return kImageFormatBGR;
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53 case GL_BGRA:
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54 return kImageFormatBGRA;
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55 case GL_RGB:
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56 return kImageFormatRGB;
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57 case GL_RGBA:
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58 return kImageFormatRGBA;
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59 }
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60
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61 return kImageFormatNull;
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62 }
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63
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64 static inline
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65 GLenum asOpenGLImageFormat(const ImageFormat format)
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66 {
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67 switch (format)
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68 {
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69 case kImageFormatNull:
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70 break;
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71 case kImageFormatGrayscale:
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72 #ifdef DGL_USE_OPENGL3
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73 return GL_RED;
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74 #else
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75 return GL_LUMINANCE;
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76 #endif
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77 case kImageFormatBGR:
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78 return GL_BGR;
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79 case kImageFormatBGRA:
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80 return GL_BGRA;
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81 case kImageFormatRGB:
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82 return GL_RGB;
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83 case kImageFormatRGBA:
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84 return GL_RGBA;
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85 }
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86
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87 return 0x0;
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88 }
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89
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90 // -----------------------------------------------------------------------
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91
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92 /**
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93 OpenGL Image class.
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94
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95 This is an Image class that handles raw image data in pixels.
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96 You can init the image data on the contructor or later on by calling loadFromMemory().
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97
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98 To generate raw data useful for this class see the utils/png2rgba.py script.
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99 Be careful when using a PNG without alpha channel, for those the format is 'GL_BGR'
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100 instead of the default 'GL_BGRA'.
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101
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102 Images are drawn on screen via 2D textures.
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103 */
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104 class OpenGLImage : public ImageBase
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105 {
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106 public:
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107 /**
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108 Constructor for a null Image.
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109 */
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110 OpenGLImage();
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111
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112 /**
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113 Constructor using raw image data.
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114 @note @a rawData must remain valid for the lifetime of this Image.
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115 */
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116 OpenGLImage(const char* rawData, uint width, uint height, ImageFormat format = kImageFormatBGRA);
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117
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118 /**
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119 Constructor using raw image data.
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120 @note @a rawData must remain valid for the lifetime of this Image.
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121 */
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122 OpenGLImage(const char* rawData, const Size<uint>& size, ImageFormat format = kImageFormatBGRA);
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123
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124 /**
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125 Constructor using another image data.
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126 */
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127 OpenGLImage(const OpenGLImage& image);
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128
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129 /**
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130 Destructor.
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131 */
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132 ~OpenGLImage() override;
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133
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134 /**
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135 Load image data from memory.
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136 @note @a rawData must remain valid for the lifetime of this Image.
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137 */
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138 void loadFromMemory(const char* rawData,
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139 const Size<uint>& size,
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140 ImageFormat format = kImageFormatBGRA) noexcept override;
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141
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142 /**
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143 Draw this image at position @a pos using the graphics context @a context.
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144 */
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145 void drawAt(const GraphicsContext& context, const Point<int>& pos) override;
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146
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147 /**
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148 TODO document this.
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149 */
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150 OpenGLImage& operator=(const OpenGLImage& image) noexcept;
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151
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152 // FIXME this should not be needed
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153 inline void loadFromMemory(const char* rdata, uint w, uint h, ImageFormat fmt = kImageFormatBGRA)
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154 { loadFromMemory(rdata, Size<uint>(w, h), fmt); }
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155 inline void draw(const GraphicsContext& context)
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156 { drawAt(context, Point<int>(0, 0)); }
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157 inline void drawAt(const GraphicsContext& context, int x, int y)
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158 { drawAt(context, Point<int>(x, y)); }
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159
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160 /**
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161 Constructor using raw image data, specifying an OpenGL image format.
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162 @note @a rawData must remain valid for the lifetime of this Image.
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163 DEPRECATED This constructor uses OpenGL image format instead of DISTRHO one.
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164 */
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165 DISTRHO_DEPRECATED_BY("OpenGLImage(const char*, uint, uint, ImageFormat)")
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166 explicit OpenGLImage(const char* rawData, uint width, uint height, GLenum glFormat);
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167
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168 /**
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169 Constructor using raw image data, specifying an OpenGL image format.
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170 @note @a rawData must remain valid for the lifetime of this Image.
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171 DEPRECATED This constructor uses OpenGL image format instead of DISTRHO one.
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172 */
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173 DISTRHO_DEPRECATED_BY("OpenGLImage(const char*, const Size<uint>&, ImageFormat)")
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174 explicit OpenGLImage(const char* rawData, const Size<uint>& size, GLenum glFormat);
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175
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176 /**
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177 Draw this image at (0, 0) point using the current OpenGL context.
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178 DEPRECATED This function does not take into consideration the current graphics context and only works in OpenGL.
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179 */
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180 DISTRHO_DEPRECATED_BY("draw(const GraphicsContext&)")
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181 void draw();
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182
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183 /**
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184 Draw this image at (x, y) point using the current OpenGL context.
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185 DEPRECATED This function does not take into consideration the current graphics context and only works in OpenGL.
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186 */
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187 DISTRHO_DEPRECATED_BY("drawAt(const GraphicsContext&, int, int)")
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188 void drawAt(int x, int y);
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189
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190 /**
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191 Draw this image at position @a pos using the current OpenGL context.
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192 DEPRECATED This function does not take into consideration the current graphics context and only works in OpenGL.
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193 */
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194 DISTRHO_DEPRECATED_BY("drawAt(const GraphicsContext&, const Point<int>&)")
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195 void drawAt(const Point<int>& pos);
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196
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197 /**
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198 Get the image type.
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199 DEPRECATED Type is always assumed to be GL_UNSIGNED_BYTE.
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200 */
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201 DISTRHO_DEPRECATED
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202 GLenum getType() const noexcept { return GL_UNSIGNED_BYTE; }
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203
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204 private:
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205 bool setupCalled;
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206 bool textureInit;
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207 GLuint textureId;
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208 };
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209
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210 // -----------------------------------------------------------------------
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211
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212 typedef ImageBaseAboutWindow<OpenGLImage> OpenGLImageAboutWindow;
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213 typedef ImageBaseButton<OpenGLImage> OpenGLImageButton;
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214 typedef ImageBaseKnob<OpenGLImage> OpenGLImageKnob;
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215 typedef ImageBaseSlider<OpenGLImage> OpenGLImageSlider;
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216 typedef ImageBaseSwitch<OpenGLImage> OpenGLImageSwitch;
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217
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218 // -----------------------------------------------------------------------
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219
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220 END_NAMESPACE_DGL
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221
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222 #endif // DGL_OPENGL_HPP_INCLUDED