git.mutantstargoat.com Git - laserbrain_demo/blob - src/rend_cubemap.cc

   1 #include "opengl.h"
   2 #include "rend_cubemap.h"
   3
   4 RendCubemap::RendCubemap()
   5 {
   6         cubemap = 0;
   7         fbo = zbuf = 0;
   8         zbuf_width = zbuf_height = 0;
   9
  10         proj_matrix.perspective(M_PI / 2.0, 1, 0.5, 10000);
  11 }
  12
  13 void RendCubemap::set_position(const Vec3 &pos)
  14 {
  15         this->pos = pos;
  16 }
  17
  18 void RendCubemap::set_cubemap(Texture *cubemap)
  19 {
  20         this->cubemap = cubemap;
  21 }
  22
  23 void RendCubemap::draw() const
  24 {
  25         static const Vec3 targ[] = {
  26                 Vec3{1, 0, 0}, Vec3{-1, 0, 0},
  27                 Vec3{0, 1, 0}, Vec3{0, -1, 0},
  28                 Vec3{0, 0, 1}, Vec3{0, 0, -1}
  29         };
  30         static const Vec3 up[] = {
  31                 Vec3{0, 1, 0}, Vec3{0, 1, 0},
  32                 Vec3{0, 0, 1}, Vec3{0, 0, -1},
  33                 Vec3{0, 1, 0}, Vec3{0, 1, 0}
  34         };
  35         if(!cubemap) return;
  36
  37         glMatrixMode(GL_PROJECTION);
  38         glPushMatrix();
  39         glLoadMatrixf(proj_matrix[0]);
  40
  41         for(int i=0; i<6; i++) {
  42                 Mat4 vmat;
  43                 vmat.inv_lookat(pos, targ[i], up[i]);
  44
  45                 glMatrixMode(GL_MODELVIEW);
  46                 if(i == 0) glPushMatrix();
  47                 glLoadMatrixf(vmat[0]);
  48
  49                 setup(i);
  50
  51                 Renderer::draw();
  52         }
  53
  54         glMatrixMode(GL_PROJECTION);
  55         glPopMatrix();
  56         glMatrixMode(GL_MODELVIEW);
  57         glPopMatrix();
  58 }
  59
  60 void RendCubemap::draw_object(Object *obj) const
  61 {
  62         obj->draw();
  63 }
  64
  65 void RendCubemap::setup(int face_idx) const
  66 {
  67         if(!cubemap) return;
  68
  69         if(!fbo) {
  70                 glGenFramebuffers(1, &fbo);
  71         }
  72         glBindFramebuffer(GL_FRAMEBUFFER, fbo);
  73         if(!zbuf) {
  74                 glGenRenderbuffers(1, &zbuf);
  75                 glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, zbuf);
  76         }
  77
  78         if(zbuf_width != cubemap->get_width() || zbuf_height != cubemap->get_height()) {
  79                 zbuf_width = cubemap->get_width();
  80                 zbuf_height = cubemap->get_height();
  81                 glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT24, zbuf_width, zbuf_height);
  82         }
  83
  84         glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
  85                         GL_TEXTURE_CUBE_MAP_POSITIVE_X + face_idx, cubemap->get_id(), 0);
  86 }