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1 #include <stdio.h>
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2 #include <stdlib.h>
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3 #include <string.h>
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4 #include <limits.h>
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5 #include "opengl.h"
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6 #include "renderer.h"
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7 #include "sdr.h"
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8 #include "datapath.h"
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9
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10 static bool create_fbo(int xsz, int ysz);
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11 static bool load_shaders();
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12 static int round_pow2(int x);
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13
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14
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15 #define MRT_COUNT 4
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16 static unsigned int mrt_tex[MRT_COUNT];
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17
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18 static unsigned int mrt_prog;
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19 static unsigned int deferred_omni;
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20
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21 static unsigned int fbo, rbuf_depth;
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22 static const char *fbstname[] = {
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23 "GL_FRAMEBUFFER_COMPLETE",
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24 "GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT",
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25 "GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT",
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26 "no such fbo error",
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27 "GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS",
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28 "GL_FRAMEBUFFER_INCOMPLETE_FORMATS",
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29 "GL_FRAMEBUFFER_INCOMPLETE_DRAW_BUFFER",
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30 "GL_FRAMEBUFFER_INCOMPLETE_READ_BUFFER",
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31 "GL_FRAMEBUFFER_UNSUPPORTED"
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32 };
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33
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34 static int fb_xsz, fb_ysz, tex_xsz, tex_ysz;
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35
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36 bool init_renderer(int xsz, int ysz)
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37 {
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38 if(!create_fbo(xsz, ysz)) {
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39 return false;
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40 }
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41 if(!load_shaders()) {
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42 return false;
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43 }
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44 return true;
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45 }
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46
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47 void destroy_renderer()
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48 {
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49 free_program(mrt_prog);
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50 free_program(deferred_omni);
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51
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52 glDeleteTextures(MRT_COUNT, mrt_tex);
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53 glDeleteFramebuffersEXT(1, &fbo);
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54 }
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55
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56 void render_deferred(void (*draw_func)())
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57 {
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58 bind_program(mrt_prog);
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59 draw_func();
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60 bind_program(0);
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61 }
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62
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63 static bool create_fbo(int xsz, int ysz)
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64 {
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65 unsigned int clamp = GL_ARB_texture_border_clamp ? GL_CLAMP_TO_EDGE : GL_CLAMP;
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66
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67 tex_xsz = round_pow2(xsz);
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68 tex_ysz = round_pow2(ysz);
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69 fb_xsz = xsz;
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70 fb_ysz = ysz;
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71
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72 if(!glGenFramebuffersEXT) {
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73 fprintf(stderr, "FBO support missing\n");
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74 return false;
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75 }
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76 glGenFramebuffersEXT(1, &fbo);
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77
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78 glGenRenderbuffersEXT(1, &rbuf_depth);
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79 glBindRenderbufferEXT(GL_RENDERBUFFER, rbuf_depth);
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80 glRenderbufferStorageEXT(GL_RENDERBUFFER, GL_DEPTH_COMPONENT, tex_xsz, tex_ysz);
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81 glFramebufferRenderbufferEXT(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, rbuf_depth);
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82
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83 glGenTextures(MRT_COUNT, mrt_tex);
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84 for(int i=0; i<MRT_COUNT; i++) {
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85 glBindTexture(GL_TEXTURE_2D, mrt_tex[i]);
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86 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, clamp);
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87 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, clamp);
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88 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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89 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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90 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, tex_xsz, tex_ysz, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
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91
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92 // attach to fbo
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93 glFramebufferTexture2DEXT(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0 + i, GL_TEXTURE_2D,
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94 mrt_tex[i], 0);
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95 }
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96
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97 int fbst = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER);
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98 if(fbst != GL_FRAMEBUFFER_COMPLETE) {
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99 fprintf(stderr, "incomplete fbo: %u (%s)\n", fbo, fbstname[fbst - GL_FRAMEBUFFER_COMPLETE]);
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100 return false;
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101 }
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102 return true;
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103 }
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104
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105 static bool load_shaders()
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106 {
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107 char vsfile[PATH_MAX], psfile[PATH_MAX];
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108 const char *fname;
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109
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110 if((fname = datafile_path("mrt.v.glsl"))) {
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111 strcpy(vsfile, fname);
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112 } else {
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113 vsfile[0] = 0;
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114 }
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115 if((fname = datafile_path("mrt.p.glsl"))) {
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116 strcpy(psfile, fname);
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117 } else {
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118 psfile[0] = 0;
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119 }
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120 if(!(mrt_prog = create_program_load(vsfile, psfile))) {
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121 fprintf(stderr, "failed to load MRT program\n");
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122 return false;
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123 }
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124
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125 if((fname = datafile_path("deferred.v.glsl"))) {
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126 strcpy(vsfile, fname);
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127 } else {
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128 vsfile[0] = 0;
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129 }
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130 if((fname = datafile_path("deferred.p.glsl"))) {
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131 strcpy(psfile, fname);
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132 } else {
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133 psfile[0] = 0;
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134 }
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135
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136 if(!(deferred_omni = create_program_load(vsfile, psfile))) {
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137 fprintf(stderr, "failed to load deferred shader program\n");
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138 return false;
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139 }
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140 return true;
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141 }
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142
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143 static int round_pow2(int x)
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144 {
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145 x--;
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146 x = (x >> 1) | x;
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147 x = (x >> 2) | x;
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148 x = (x >> 4) | x;
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149 x = (x >> 8) | x;
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150 x = (x >> 16) | x;
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151 return x + 1;
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152 }
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