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1 #include <stdio.h>
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2 #include <assert.h>
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3 #include <algorithm>
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4 #include "opengl.h"
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5 #include "game.h"
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6 #include "goatvr.h"
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7
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8 static void create_rtarg(int x, int y);
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9 static int next_pow2(int x);
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10
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11 static int win_width, win_height;
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12 static unsigned int fb_tex;
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13 static unsigned int fbo, fb_depth;
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14 static int fb_xsz, fb_ysz;
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15 static int fb_tex_xsz, fb_tex_ysz;
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16
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17 bool game_init()
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18 {
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19 init_opengl();
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20
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21 if(vr_init() == -1) {
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22 return false;
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23 }
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24
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25 glEnable(GL_DEPTH_TEST);
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26 glEnable(GL_CULL_FACE);
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27
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28 int sdk_fb_xsz = vr_getf(VR_LEYE_XRES) + vr_getf(VR_REYE_XRES);
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29 int sdk_fb_ysz = std::max(vr_getf(VR_LEYE_YRES), vr_getf(VR_REYE_YRES));
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30 create_rtarg(sdk_fb_xsz, sdk_fb_ysz);
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31
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32 return true;
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33 }
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34
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35 void game_cleanup()
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36 {
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37 vr_shutdown();
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38 }
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39
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40 void game_update(long tm)
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41 {
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42 }
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43
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44 void game_display()
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45 {
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46 }
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47
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48 void game_reshape(int x, int y)
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49 {
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50 }
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51
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52 void game_keyboard(int key, bool pressed);
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53 void game_mouse_button(int bn, bool state, int x, int y);
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54 void game_mouse_motion(int x, int y);
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55
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56
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57 static void create_rtarg(int x, int y)
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58 {
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59 if(x == fb_xsz && y == fb_ysz) {
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60 return; // nothing changed
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61 }
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62
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63 fb_xsz = x;
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64 fb_ysz = y;
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65 fb_tex_xsz = next_pow2(fb_xsz);
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66 fb_tex_ysz = next_pow2(fb_ysz);
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67
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68 if(!fbo) {
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69 glGenFramebuffers(1, &fbo);
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70
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71 glGenTextures(1, &fb_tex);
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72 glBindTexture(GL_TEXTURE_2D, fb_tex);
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73 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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74 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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75
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76 glGenRenderbuffers(1, &fb_depth);
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77 }
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78
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79 glBindFramebuffer(GL_FRAMEBUFFER, fbo);
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80
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81 glBindTexture(GL_TEXTURE_2D, fb_tex);
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82 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, fb_tex_xsz, fb_tex_ysz, 0, GL_RGB, GL_UNSIGNED_BYTE, 0);
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83 glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, fb_tex, 0);
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84
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85 glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT, fb_tex_xsz, fb_tex_ysz);
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86 glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, fb_depth);
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87
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88 assert(glCheckFramebufferStatus(GL_FRAMEBUFFER) == GL_FRAMEBUFFER_COMPLETE);
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89 glBindFramebuffer(GL_FRAMEBUFFER, 0);
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90 }
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91
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92 static int next_pow2(int x)
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93 {
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94 x -= 1;
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95 x |= x >> 1;
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96 x |= x >> 2;
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97 x |= x >> 4;
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98 x |= x >> 8;
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99 x |= x >> 16;
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100 return x + 1;
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101 }
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