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nuclear@15
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1 #include <stdio.h>
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nuclear@15
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2 #include <stdlib.h>
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nuclear@15
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3 #include <string.h>
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nuclear@15
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4 #include <limits.h>
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nuclear@18
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5 #include <assert.h>
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nuclear@15
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6 #include "opengl.h"
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7 #include "renderer.h"
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nuclear@15
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8 #include "sdr.h"
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9 #include "datapath.h"
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10
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nuclear@18
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11
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nuclear@17
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12 static bool create_fbo(int xsz, int ysz);
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nuclear@18
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13 static unsigned int load_sdr(const char *vfname, const char *pfname);
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nuclear@17
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14 static int round_pow2(int x);
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nuclear@15
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15
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nuclear@17
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16
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nuclear@19
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17 #define MRT_COUNT 4
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nuclear@17
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18 static unsigned int mrt_tex[MRT_COUNT];
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19
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20 static unsigned int mrt_prog;
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21 static unsigned int deferred_omni, deferred_debug;
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22
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23 static unsigned int fbo, rbuf_depth;
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24 static const char *fbstname[] = {
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nuclear@17
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25 "GL_FRAMEBUFFER_COMPLETE",
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26 "GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT",
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27 "GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT",
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28 "no such fbo error",
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29 "GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS",
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30 "GL_FRAMEBUFFER_INCOMPLETE_FORMATS",
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31 "GL_FRAMEBUFFER_INCOMPLETE_DRAW_BUFFER",
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32 "GL_FRAMEBUFFER_INCOMPLETE_READ_BUFFER",
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33 "GL_FRAMEBUFFER_UNSUPPORTED"
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34 };
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35
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36 static int fb_xsz, fb_ysz, tex_xsz, tex_ysz;
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37
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38 bool init_renderer(int xsz, int ysz)
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39 {
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40 int max_draw_buf;
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41
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42 glGetIntegerv(GL_MAX_DRAW_BUFFERS_ARB, &max_draw_buf);
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43 CHECKGLERR;
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44 printf("max draw buffers: %d\n", max_draw_buf);
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45 if(max_draw_buf < MRT_COUNT) {
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46 fprintf(stderr, "OpenGL implementation doesn't support enough draw buffers\n");
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47 return false;
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48 }
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49
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50 if(!create_fbo(xsz, ysz)) {
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51 return false;
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52 }
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53 CHECKGLERR;
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54
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55 if(!(mrt_prog = load_sdr("mrt.v.glsl", "mrt.p.glsl"))) {
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56 return false;
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57 }
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58 if(!(deferred_debug = load_sdr("deferred.v.glsl", "deferred.p.glsl"))) {
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59 return false;
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60 }
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61 return true;
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62 }
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63
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64 void destroy_renderer()
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65 {
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66 free_program(mrt_prog);
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67 free_program(deferred_omni);
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68
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69 glDeleteTextures(MRT_COUNT, mrt_tex);
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70 glDeleteFramebuffersEXT(1, &fbo);
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71 }
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72
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73 void render_deferred(void (*draw_func)())
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74 {
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75 int loc;
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76
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77 // render into the MRT buffers
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78 glBindFramebufferEXT(GL_FRAMEBUFFER, fbo);
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79
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80 glUseProgram(mrt_prog);
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81 if((loc = glGetUniformLocation(mrt_prog, "tex_dif")) != -1) {
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82 glUniform1i(loc, 0);
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83 }
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84 if((loc = glGetUniformLocation(mrt_prog, "tex_norm")) != -1) {
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85 glUniform1i(loc, 1);
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86 }
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87 draw_func();
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88
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89 glUseProgram(0);
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90 glBindFramebufferEXT(GL_FRAMEBUFFER, 0);
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91
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92
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93 // post-process lighting
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94 glPushAttrib(GL_ENABLE_BIT);
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95
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96 glDisable(GL_LIGHTING);
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97 glDisable(GL_DEPTH_TEST);
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98
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99 glUseProgram(deferred_debug);
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nuclear@19
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100 for(int i=0; i<MRT_COUNT; i++) {
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101 char uname[32];
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102
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103 sprintf(uname, "mrt%d", i);
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104 if((loc = glGetUniformLocation(deferred_debug, uname)) != -1) {
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105 glUniform1i(loc, i);
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106 }
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107
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108 glActiveTexture(GL_TEXTURE0 + i);
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109 glBindTexture(GL_TEXTURE_2D, mrt_tex[i]);
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110 glEnable(GL_TEXTURE_2D);
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111 }
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112 if((loc = glGetUniformLocation(deferred_debug, "tex_scale")) != -1) {
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113 glUniform2f(loc, (float)fb_xsz / tex_xsz, (float)fb_ysz / tex_ysz);
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114 }
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115
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116 glBegin(GL_QUADS);
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117 glTexCoord2f(0, 0);
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118 glVertex2f(-1, -1);
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119 glTexCoord2f(1, 0);
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120 glVertex2f(1, -1);
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121 glTexCoord2f(1, 1);
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122 glVertex2f(1, 1);
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123 glTexCoord2f(0, 1);
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124 glVertex2f(-1, 1);
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125 glEnd();
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126
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127 for(int i=0; i<MRT_COUNT; i++) {
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128 glActiveTexture(GL_TEXTURE0 + MRT_COUNT - i - 1);
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129 glDisable(GL_TEXTURE_2D);
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130 }
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131
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132 glUseProgram(0);
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133 glPopAttrib();
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134 }
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135
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136 static bool create_fbo(int xsz, int ysz)
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137 {
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138 unsigned int clamp = GL_ARB_texture_border_clamp ? GL_CLAMP_TO_EDGE : GL_CLAMP;
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139
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140 tex_xsz = round_pow2(xsz);
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141 tex_ysz = round_pow2(ysz);
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142 fb_xsz = xsz;
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143 fb_ysz = ysz;
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144
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145 if(!glGenFramebuffersEXT) {
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146 fprintf(stderr, "FBO support missing\n");
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147 return false;
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148 }
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149 glGenFramebuffersEXT(1, &fbo);
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150 glBindFramebufferEXT(GL_FRAMEBUFFER, fbo);
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151
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152 glGenTextures(MRT_COUNT, mrt_tex);
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153 for(int i=0; i<MRT_COUNT; i++) {
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154 glBindTexture(GL_TEXTURE_2D, mrt_tex[i]);
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155 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, clamp);
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156 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, clamp);
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157 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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158 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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159 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, tex_xsz, tex_ysz, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
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160
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161 // attach to fbo
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162 glFramebufferTexture2DEXT(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0 + i,
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163 GL_TEXTURE_2D, mrt_tex[i], 0);
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164 CHECKGLERR;
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165 }
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166
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nuclear@20
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167 static GLenum draw_bufs[] = {
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168 GL_COLOR_ATTACHMENT0_EXT, GL_COLOR_ATTACHMENT1_EXT,
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169 GL_COLOR_ATTACHMENT2_EXT, GL_COLOR_ATTACHMENT3_EXT,
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170 GL_COLOR_ATTACHMENT4_EXT, GL_COLOR_ATTACHMENT5_EXT,
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171 GL_COLOR_ATTACHMENT6_EXT, GL_COLOR_ATTACHMENT7_EXT
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172 };
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173 glDrawBuffersARB(MRT_COUNT, draw_bufs);
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174
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175 glGenRenderbuffersEXT(1, &rbuf_depth);
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176 glBindRenderbufferEXT(GL_RENDERBUFFER, rbuf_depth);
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177 glRenderbufferStorageEXT(GL_RENDERBUFFER, GL_DEPTH_COMPONENT, tex_xsz, tex_ysz);
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178 glFramebufferRenderbufferEXT(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, rbuf_depth);
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179
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180 int fbst = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER);
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181 if(fbst != GL_FRAMEBUFFER_COMPLETE) {
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182 fprintf(stderr, "incomplete fbo: %u (%s)\n", fbo, fbstname[fbst - GL_FRAMEBUFFER_COMPLETE]);
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183 return false;
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184 }
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185 CHECKGLERR;
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186
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187 glBindFramebufferEXT(GL_FRAMEBUFFER, 0);
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188 return true;
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189 }
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190
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nuclear@18
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191 static unsigned int load_sdr(const char *vfname, const char *pfname)
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192 {
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193 char vsfile[PATH_MAX], psfile[PATH_MAX];
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194 const char *fname;
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195 unsigned int prog;
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196
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197 if((fname = datafile_path(vfname))) {
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198 strcpy(vsfile, fname);
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199 } else {
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200 vsfile[0] = 0;
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201 }
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202 if((fname = datafile_path(pfname))) {
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203 strcpy(psfile, fname);
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204 } else {
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205 psfile[0] = 0;
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206 }
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nuclear@18
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207 if(!(prog = create_program_load(vsfile, psfile))) {
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208 fprintf(stderr, "failed to load shader program (%s, %s)\n", vsfile, psfile);
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209 return 0;
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210 }
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211 return prog;
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212 }
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213
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214 static int round_pow2(int x)
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215 {
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216 x--;
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217 x = (x >> 1) | x;
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218 x = (x >> 2) | x;
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219 x = (x >> 4) | x;
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220 x = (x >> 8) | x;
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221 x = (x >> 16) | x;
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222 return x + 1;
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223 }
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