1 | /* -*- mode: c++; c-basic-offset: 4; indent-tabs-mode: nil -*- */ |
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2 | /* |
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3 | * ---------------------------------------------------------------------- |
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4 | * ScreenSnapper.h: ScreenSnapper class. It captures the render result |
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5 | * and stores it in an array of chars or floats |
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6 | * depending on chosen format. |
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7 | * |
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8 | * ====================================================================== |
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9 | * AUTHOR: Wei Qiao <qiaow@purdue.edu> |
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10 | * Purdue Rendering and Perceptualization Lab (PURPL) |
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11 | * |
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12 | * Copyright (c) 2004-2012 HUBzero Foundation, LLC |
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13 | * |
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14 | * See the file "license.terms" for information on usage and |
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15 | * redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES. |
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16 | * ====================================================================== |
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17 | */ |
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18 | |
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19 | #include <memory.h> |
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20 | #include <assert.h> |
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21 | |
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22 | #include "ScreenSnapper.h" |
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23 | #include "Trace.h" |
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24 | |
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25 | ScreenSnapper::ScreenSnapper(int w, int h, GLuint type, |
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26 | int channelsPerPixel) |
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27 | { |
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28 | _width = w; |
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29 | _height = h; |
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30 | |
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31 | //only allow two types |
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32 | assert(type == GL_FLOAT || type == GL_UNSIGNED_BYTE); |
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33 | _dataType = type; |
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34 | |
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35 | //only allow RGB or RGBA |
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36 | assert(channelsPerPixel == 3 || channelsPerPixel == 4); |
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37 | _numChannelsPerPixel = channelsPerPixel; |
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38 | |
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39 | if (type == GL_FLOAT) |
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40 | _data = new float[w*h*channelsPerPixel]; |
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41 | else if (type == GL_UNSIGNED_BYTE) |
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42 | _data = new unsigned char[w*h*channelsPerPixel]; |
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43 | |
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44 | assert(_data != 0); |
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45 | reset(0); //reset data |
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46 | } |
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47 | |
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48 | ScreenSnapper::~ScreenSnapper() |
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49 | { |
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50 | if (_dataType == GL_FLOAT) |
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51 | delete[] (float *)_data; |
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52 | else if(_dataType == GL_UNSIGNED_BYTE) |
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53 | delete[] (unsigned char*)_data; |
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54 | } |
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55 | |
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56 | void |
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57 | ScreenSnapper::reset(char c) |
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58 | { |
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59 | unsigned int elemSize; |
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60 | switch (_dataType) { |
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61 | case GL_FLOAT: |
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62 | elemSize = sizeof(float); |
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63 | break; |
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64 | case GL_UNSIGNED_BYTE: |
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65 | elemSize = sizeof(unsigned char); |
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66 | break; |
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67 | default: |
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68 | assert(0); |
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69 | break; |
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70 | } |
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71 | unsigned int size; |
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72 | size = elemSize * _width * _height * _numChannelsPerPixel; |
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73 | memset(_data, size, c); |
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74 | } |
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75 | |
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76 | void |
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77 | ScreenSnapper::capture() |
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78 | { |
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79 | if (_dataType == GL_FLOAT) { |
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80 | if (_numChannelsPerPixel == 3) |
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81 | glReadPixels(0, 0, _width, _height, GL_RGB, GL_FLOAT, _data); |
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82 | else if (_numChannelsPerPixel == 4) |
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83 | glReadPixels(0, 0, _width, _height, GL_RGBA, GL_FLOAT, _data); |
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84 | } else if (_dataType == GL_UNSIGNED_BYTE) { |
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85 | if (_numChannelsPerPixel == 3) |
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86 | glReadPixels(0, 0, _width, _height, GL_RGB, GL_UNSIGNED_BYTE, _data); |
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87 | else if (_numChannelsPerPixel == 4) |
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88 | glReadPixels(0, 0, _width, _height, GL_RGBA, GL_UNSIGNED_BYTE, _data); |
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89 | } |
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90 | assert(glGetError() == 0); |
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91 | } |
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92 | |
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93 | void |
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94 | ScreenSnapper::print() |
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95 | { |
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96 | for (int i = 0; i < _width*_height; i++) { |
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97 | if (_dataType == GL_FLOAT) { |
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98 | if (_numChannelsPerPixel == 3) { |
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99 | TRACE("(%f %f %f) ", ((float *)_data)[3*i], |
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100 | ((float*)_data)[3*i+1], ((float *)_data)[3*i+2]); |
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101 | } else if (_numChannelsPerPixel == 4) { |
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102 | TRACE("(%f %f %f %f) ", ((float *)_data)[4*i], |
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103 | ((float *)_data)[4*i+1], |
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104 | ((float *)_data)[4*i+2], |
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105 | ((float *)_data)[4*i+3]); |
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106 | } |
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107 | } else if (_dataType == GL_UNSIGNED_BYTE) { |
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108 | if (_numChannelsPerPixel == 3) { |
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109 | TRACE("(%d %d %d) ", |
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110 | ((unsigned char *)_data)[3*i], |
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111 | ((unsigned char *)_data)[3*i+1], |
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112 | ((unsigned char *)_data)[3*i+2]); |
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113 | } else if (_numChannelsPerPixel == 4) { |
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114 | TRACE("(%d %d %d %d) ", |
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115 | ((unsigned char *)_data)[4*i], |
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116 | ((unsigned char *)_data)[4*i+1], |
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117 | ((unsigned char *)_data)[4*i+2], |
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118 | ((unsigned char *)_data)[4*i+3]); |
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119 | } |
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120 | } |
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121 | } |
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122 | } |
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123 | |
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