| 1 | |
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| 2 | /* |
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| 3 | * ---------------------------------------------------------------------- |
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| 4 | * PlaneRenderer.cpp : PlaneRenderer class for volume visualization |
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| 5 | * |
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| 6 | * ====================================================================== |
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| 7 | * AUTHOR: Wei Qiao <qiaow@purdue.edu> |
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| 8 | * Purdue Rendering and Perceptualization Lab (PURPL) |
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| 9 | * |
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| 10 | * Copyright (c) 2004-2006 Purdue Research Foundation |
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| 11 | * |
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| 12 | * See the file "license.terms" for information on usage and |
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| 13 | * redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES. |
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| 14 | * ====================================================================== |
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| 15 | */ |
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| 16 | |
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| 17 | #include "global.h" |
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| 18 | #include "PlaneRenderer.h" |
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| 19 | #include "Trace.h" |
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| 20 | |
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| 21 | PlaneRenderer::PlaneRenderer(CGcontext _context, int _width, int _height): |
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| 22 | active_plane(-1), |
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| 23 | n_planes(0), |
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| 24 | render_width(_width), |
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| 25 | render_height(_height), |
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| 26 | g_context(_context) |
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| 27 | { |
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| 28 | plane.clear(); |
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| 29 | tf.clear(); |
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| 30 | init_shaders(); |
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| 31 | } |
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| 32 | |
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| 33 | PlaneRenderer::~PlaneRenderer() |
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| 34 | { |
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| 35 | /*empty*/ |
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| 36 | } |
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| 37 | |
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| 38 | //initialize the render shader |
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| 39 | void |
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| 40 | PlaneRenderer::init_shaders() |
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| 41 | { |
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| 42 | //plane rendering shader |
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| 43 | m_fprog = LoadCgSourceProgram(g_context, "one_plane.cg", CG_PROFILE_FP30, |
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| 44 | NULL); |
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| 45 | m_data_param = cgGetNamedParameter(m_fprog, "data"); |
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| 46 | m_tf_param = cgGetNamedParameter(m_fprog, "tf"); |
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| 47 | m_render_param = cgGetNamedParameter(m_fprog, "render_param"); |
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| 48 | } |
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| 49 | |
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| 50 | |
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| 51 | int |
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| 52 | PlaneRenderer::add_plane(Texture2D* _p, TransferFunction* _tf) |
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| 53 | { |
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| 54 | int ret = n_planes; |
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| 55 | |
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| 56 | plane.push_back(_p); |
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| 57 | tf.push_back(_tf); |
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| 58 | |
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| 59 | if(ret==0) |
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| 60 | active_plane = ret; |
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| 61 | |
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| 62 | n_planes++; |
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| 63 | return ret; |
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| 64 | } |
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| 65 | |
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| 66 | void |
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| 67 | PlaneRenderer::remove_plane(int index) { |
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| 68 | vector<Texture2D*>::iterator piter = plane.begin()+index; |
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| 69 | vector<TransferFunction*>::iterator tfiter = tf.begin()+index; |
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| 70 | |
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| 71 | plane.erase(piter); |
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| 72 | tf.erase(tfiter); |
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| 73 | |
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| 74 | n_planes--; |
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| 75 | } |
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| 76 | |
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| 77 | |
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| 78 | void |
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| 79 | PlaneRenderer::render() |
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| 80 | { |
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| 81 | if (n_planes == 0) |
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| 82 | return; |
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| 83 | |
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| 84 | glEnable(GL_TEXTURE_2D); |
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| 85 | glEnable(GL_BLEND); |
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| 86 | |
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| 87 | glViewport(0, 0, render_width, render_height); |
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| 88 | glMatrixMode(GL_PROJECTION); |
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| 89 | glLoadIdentity(); |
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| 90 | gluOrtho2D(0, render_width, 0, render_height); |
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| 91 | glMatrixMode(GL_MODELVIEW); |
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| 92 | glLoadIdentity(); |
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| 93 | |
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| 94 | //glColor3f(1.,1.,1.); //MUST HAVE THIS LINE!!! |
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| 95 | |
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| 96 | //if no active plane |
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| 97 | if(active_plane == -1) |
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| 98 | return; |
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| 99 | |
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| 100 | activate_shader(active_plane); |
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| 101 | glBegin(GL_QUADS); |
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| 102 | glTexCoord2f(0, 0); glVertex2f(0, 0); |
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| 103 | glTexCoord2f(1, 0); glVertex2f(render_width, 0); |
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| 104 | glTexCoord2f(1, 1); glVertex2f(render_width, render_height); |
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| 105 | glTexCoord2f(0, 1); glVertex2f(0, render_height); |
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| 106 | glEnd(); |
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| 107 | deactivate_shader(); |
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| 108 | |
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| 109 | } |
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| 110 | |
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| 111 | void |
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| 112 | PlaneRenderer::activate_shader(int index) |
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| 113 | { |
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| 114 | |
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| 115 | cgGLSetTextureParameter(m_data_param, plane[index]->id); |
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| 116 | cgGLSetTextureParameter(m_tf_param, tf[index]->id); |
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| 117 | cgGLEnableTextureParameter(m_data_param); |
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| 118 | cgGLEnableTextureParameter(m_tf_param); |
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| 119 | |
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| 120 | cgGLSetParameter4f(m_render_param, 0., 0., 0., 0.); |
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| 121 | |
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| 122 | Trace("activate_shader: binding "); |
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| 123 | cgGLBindProgram(m_fprog); |
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| 124 | Trace("activate_shader: done binding"); |
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| 125 | cgGLEnableProfile(CG_PROFILE_FP30); |
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| 126 | } |
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| 127 | |
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| 128 | |
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| 129 | void |
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| 130 | PlaneRenderer::deactivate_shader() |
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| 131 | { |
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| 132 | cgGLDisableProfile(CG_PROFILE_FP30); |
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| 133 | cgGLDisableTextureParameter(m_data_param); |
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| 134 | cgGLDisableTextureParameter(m_tf_param); |
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| 135 | } |
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| 136 | |
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| 137 | void |
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| 138 | PlaneRenderer::set_active_plane(int index) |
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| 139 | { |
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| 140 | active_plane = index; |
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| 141 | } |
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| 142 | |
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| 143 | void |
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| 144 | PlaneRenderer::set_screen_size(int w, int h) |
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| 145 | { |
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| 146 | render_width = w; |
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| 147 | render_height = h; |
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| 148 | } |
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