1 | /*
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2 | * ----------------------------------------------------------------------
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3 | * NvParticleRenderer.cpp: particle system class
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4 | *
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5 | * ======================================================================
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6 | * AUTHOR: Wei Qiao <qiaow@purdue.edu>
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7 | * Purdue Rendering and Perceptualization Lab (PURPL)
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8 | *
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9 | * Copyright (c) 2004-2006 Purdue Research Foundation
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10 | *
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11 | * See the file "license.terms" for information on usage and
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12 | * redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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13 | * ======================================================================
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14 | */
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15 |
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16 | #include <stdio.h>
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17 | #include <assert.h>
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18 | #include <malloc.h>
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19 | #include <string.h>
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20 |
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21 | #include <R2/R2FilePath.h>
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22 | #include "NvParticleRenderer.h"
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23 |
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24 |
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25 | NvParticleRenderer::NvParticleRenderer(int w, int h, CGcontext context, NVISid volume, float scale_x,
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26 | float scale_y, float scale_z)
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27 | {
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28 |
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29 | fprintf(stderr, "%f, %f, %f\n", scale_x, scale_y, scale_z);
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30 | scale = Vector3(scale_x, scale_y, scale_z);
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31 |
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32 | psys_width = w;
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33 | psys_height = h;
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34 |
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35 | psys_frame = 0;
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36 | reborn = true;
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37 | flip = true;
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38 | max_life = 500;
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39 |
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40 | data = (Particle*) malloc(w*h*sizeof(Particle));
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41 |
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42 | m_vertex_array = new RenderVertexArray(psys_width*psys_height, 3, GL_FLOAT);
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43 | assert(glGetError()==0);
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44 |
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45 | glGenFramebuffersEXT(2, psys_fbo);
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46 | glGenTextures(2, psys_tex);
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47 |
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48 | glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, psys_fbo[0]);
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49 |
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50 | glBindTexture(GL_TEXTURE_RECTANGLE_NV, psys_tex[0]);
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51 | glTexParameterf(GL_TEXTURE_RECTANGLE_NV, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
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52 | glTexParameterf(GL_TEXTURE_RECTANGLE_NV, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
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53 | glTexImage2D(GL_TEXTURE_RECTANGLE_NV, 0, GL_FLOAT_RGBA32_NV, psys_width, psys_height, 0, GL_RGBA, GL_FLOAT, NULL);
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54 | glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT, GL_TEXTURE_RECTANGLE_NV, psys_tex[0], 0);
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55 |
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56 | glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, psys_fbo[1]);
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57 |
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58 | glBindTexture(GL_TEXTURE_RECTANGLE_NV, psys_tex[1]);
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59 | glTexParameterf(GL_TEXTURE_RECTANGLE_NV, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
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60 | glTexParameterf(GL_TEXTURE_RECTANGLE_NV, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
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61 | glTexImage2D(GL_TEXTURE_RECTANGLE_NV, 0, GL_FLOAT_RGBA32_NV, psys_width, psys_height, 0, GL_RGBA, GL_FLOAT, NULL);
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62 | glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT, GL_TEXTURE_RECTANGLE_NV, psys_tex[1], 0);
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63 |
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64 | CHECK_FRAMEBUFFER_STATUS();
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65 | assert(glGetError()==0);
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66 |
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67 | //load related shaders
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68 | /*
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69 | m_g_context = context;
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70 |
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71 | R2string path = R2FilePath::getInstance()->getPath("update_pos.cg");
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72 | m_pos_fprog = loadProgram(m_g_context, CG_PROFILE_FP30, CG_SOURCE, path);
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73 | m_pos_timestep_param = cgGetNamedParameter(m_pos_fprog, "timestep");
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74 | m_vel_tex_param = cgGetNamedParameter(m_pos_fprog, "vel_tex");
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75 | m_pos_tex_param = cgGetNamedParameter(m_pos_fprog, "pos_tex");
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76 | m_scale_param = cgGetNamedParameter(m_pos_fprog, "scale");
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77 | cgGLSetTextureParameter(m_vel_tex_param, volume);
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78 | cgGLSetParameter3f(m_scale_param, scale_x, scale_y, scale_z);
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79 | */
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80 | _advectionShader = new NvParticleAdvectionShader(scale);
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81 |
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82 | fprintf(stderr, "init_psys\n");
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83 | }
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84 |
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85 | NvParticleRenderer::~NvParticleRenderer()
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86 | {
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87 | glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, psys_fbo[0]);
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88 | glDeleteTextures(1, psys_tex);
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89 |
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90 | glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, psys_fbo[1]);
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91 | glDeleteTextures(1, psys_tex+1);
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92 |
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93 | glDeleteFramebuffersEXT(2, psys_fbo);
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94 |
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95 | free(data);
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96 | }
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97 |
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98 | void NvParticleRenderer::initialize(Particle* p)
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99 | {
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100 | //also store the data on main memory for next initialization
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101 | memcpy(data, p, psys_width*psys_height*sizeof(Particle));
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102 |
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103 | glBindTexture(GL_TEXTURE_RECTANGLE_NV, psys_tex[0]);
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104 | glTexImage2D(GL_TEXTURE_RECTANGLE_NV, 0, GL_FLOAT_RGBA32_NV, psys_width, psys_height, 0, GL_RGBA, GL_FLOAT, (float*)p);
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105 |
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106 | assert(glGetError()==0);
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107 |
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108 | flip = true;
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109 | reborn = false;
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110 |
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111 | //fprintf(stderr, "init particles\n");
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112 | }
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113 |
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114 | void NvParticleRenderer::reset()
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115 | {
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116 | glBindTexture(GL_TEXTURE_RECTANGLE_NV, psys_tex[0]);
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117 | glTexImage2D(GL_TEXTURE_RECTANGLE_NV, 0, GL_FLOAT_RGBA32_NV, psys_width, psys_height, 0, GL_RGBA, GL_FLOAT, (float*)data);
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118 |
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119 | assert(glGetError()==0);
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120 |
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121 | flip = true;
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122 | reborn = false;
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123 | psys_frame = 0;
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124 | }
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125 |
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126 |
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127 | void NvParticleRenderer::advect()
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128 | {
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129 | if (reborn)
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130 | reset();
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131 |
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132 | glDisable(GL_BLEND);
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133 |
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134 | if(flip){
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135 | glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, psys_fbo[1]);
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136 | glBindTexture(GL_TEXTURE_RECTANGLE_NV, psys_tex[0]);
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137 |
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138 | glClear(GL_COLOR_BUFFER_BIT);
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139 |
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140 | glViewport(0, 0, psys_width, psys_height);
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141 | glMatrixMode(GL_PROJECTION);
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142 | glLoadIdentity();
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143 | gluOrtho2D(0, psys_width, 0, psys_height);
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144 | glMatrixMode(GL_MODELVIEW);
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145 | glLoadIdentity();
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146 |
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147 | _advectionShader->bind(psys_tex[0]);
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148 |
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149 | /*
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150 | cgGLBindProgram(m_pos_fprog);
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151 | cgGLSetParameter1f(m_pos_timestep_param, 0.05);
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152 | cgGLEnableTextureParameter(m_vel_tex_param);
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153 | cgGLSetTextureParameter(m_pos_tex_param, psys_tex[0]);
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154 | cgGLEnableTextureParameter(m_pos_tex_param);
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155 |
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156 | cgGLEnableProfile(CG_PROFILE_FP30);
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157 | */
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158 | draw_quad(psys_width, psys_height, psys_width, psys_height);
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159 | /*
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160 | cgGLDisableProfile(CG_PROFILE_FP30);
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161 | cgGLDisableTextureParameter(m_vel_tex_param);
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162 | cgGLDisableTextureParameter(m_pos_tex_param);
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163 | */
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164 | }
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165 | else
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166 | {
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167 | glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, psys_fbo[0]);
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168 | glBindTexture(GL_TEXTURE_RECTANGLE_NV, psys_tex[1]);
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169 |
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170 | glClear(GL_COLOR_BUFFER_BIT);
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171 |
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172 | glViewport(0, 0, psys_width, psys_height);
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173 | glMatrixMode(GL_PROJECTION);
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174 | glLoadIdentity();
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175 | gluOrtho2D(0, psys_width, 0, psys_height);
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176 | glMatrixMode(GL_MODELVIEW);
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177 | glLoadIdentity();
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178 |
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179 | _advectionShader->bind(psys_tex[1]);
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180 |
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181 | /*
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182 | cgGLBindProgram(m_pos_fprog);
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183 | cgGLSetParameter1f(m_pos_timestep_param, 0.05);
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184 | cgGLEnableTextureParameter(m_vel_tex_param);
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185 | cgGLSetTextureParameter(m_pos_tex_param, psys_tex[1]);
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186 | cgGLEnableTextureParameter(m_pos_tex_param);
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187 | cgGLEnableProfile(CG_PROFILE_FP30);
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188 | */
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189 |
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190 | draw_quad(psys_width, psys_height, psys_width, psys_height);
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191 |
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192 | /*
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193 | cgGLDisableProfile(CG_PROFILE_FP30);
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194 | cgGLDisableTextureParameter(m_vel_tex_param);
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195 | cgGLDisableTextureParameter(m_pos_tex_param);
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196 | */
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197 |
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198 | }
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199 |
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200 | _advectionShader->unbind();
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201 |
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202 | assert(glGetError()==0);
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203 |
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204 | //soft_read_verts();
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205 | update_vertex_buffer();
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206 |
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207 | flip = (!flip);
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208 |
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209 | psys_frame++;
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210 | if(psys_frame==max_life)
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211 | {
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212 | psys_frame=0;
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213 | reborn = true;
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214 | }
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215 |
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216 | //fprintf(stderr, "advect: %d ", psys_frame);
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217 | }
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218 |
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219 | void NvParticleRenderer::update_vertex_buffer()
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220 | {
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221 | m_vertex_array->Read(psys_width, psys_height);
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222 | //m_vertex_array->LoadData(vert); //does not work??
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223 | assert(glGetError()==0);
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224 | }
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225 |
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226 | void NvParticleRenderer::render()
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227 | {
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228 | display_vertices();
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229 | }
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230 |
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231 | void NvParticleRenderer::display_vertices()
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232 | {
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233 | glDisable(GL_TEXTURE_2D);
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234 | glDisable(GL_BLEND);
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235 | glEnable(GL_DEPTH_TEST);
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236 |
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237 | glPointSize(1.2);
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238 | glColor4f(.2,.2,.8,1.);
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239 |
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240 | glPushMatrix();
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241 | glScaled(1./scale.x, 1./scale.y, 1./scale.z);
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242 |
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243 | m_vertex_array->SetPointer(0);
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244 | glEnableClientState(GL_VERTEX_ARRAY);
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245 | glDrawArrays(GL_POINTS, 0, psys_width*psys_height);
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246 | glDisableClientState(GL_VERTEX_ARRAY);
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247 |
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248 | glPopMatrix();
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249 |
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250 | glDisable(GL_DEPTH_TEST);
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251 | assert(glGetError()==0);
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252 | }
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253 |
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254 |
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