git.mutantstargoat.com Git - vrfileman/blob - src/backdrop.cc

   1 #include "opengl.h"
   2 #include "gmath/gmath.h"
   3 #include "sdr.h"
   4 #include "texture.h"
   5 #include "mesh.h"
   6 #include "meshgen.h"
   7 #include "backdrop.h"
   8 #include "app.h"
   9
  10 static unsigned int sdr_grid;
  11 static Texture *tex_grid;
  12
  13 static Mesh *mesh_skydome;
  14 static unsigned int sdr_skydome;
  15
  16 static const Vec3 grid_color = Vec3(1.0, 0.07, 1.0);
  17 static const Vec3 mid_color = Vec3(0.133, 0.006, 0.612);
  18 static const Vec3 horiz_color = Vec3(0.612, 0.006, 1.0);
  19 static const Vec3 zenith_color = Vec3(0.029, 0.029, 0.029);
  20 static const Vec3 fog_color = Vec3(0.01, 0.01, 0.01);
  21
  22 bool init_backdrop()
  23 {
  24         if(!(sdr_grid = create_program_load("sdr/grid.v.glsl", "sdr/grid.p.glsl"))) {
  25                 return false;
  26         }
  27         set_uniform_float3(sdr_grid, "grid_color", grid_color.x, grid_color.y, grid_color.z);
  28         set_uniform_float3(sdr_grid, "fog_color", fog_color.x, fog_color.y, fog_color.z);
  29
  30         if(!(sdr_skydome = create_program_load("sdr/skydome.v.glsl", "sdr/skydome.p.glsl"))) {
  31                 return false;
  32         }
  33         set_uniform_float3(sdr_skydome, "zenith_color", zenith_color.x, zenith_color.y, zenith_color.z);
  34         set_uniform_float3(sdr_skydome, "mid_color", mid_color.x, mid_color.y, mid_color.z);
  35         set_uniform_float3(sdr_skydome, "horiz_color", horiz_color.x, horiz_color.y, horiz_color.z);
  36         set_uniform_float3(sdr_skydome, "fog_color", fog_color.x, fog_color.y, fog_color.z);
  37
  38         if(!(tex_grid = load_texture("data/grid2.png"))) {
  39                 delete tex_grid;
  40                 return false;
  41         }
  42         tex_grid->set_anisotropy(glcaps.max_aniso);
  43
  44         mesh_skydome = new Mesh;
  45         gen_sphere(mesh_skydome, 500.0, 32, 16, 1, 0.5);
  46         mesh_skydome->flip();
  47
  48         glClearColor(fog_color.x, fog_color.y, fog_color.z, 1.0);
  49
  50         return true;
  51 }
  52
  53 void cleanup_backdrop()
  54 {
  55         delete mesh_skydome;
  56         delete tex_grid;
  57         free_program(sdr_grid);
  58 }
  59
  60 void draw_backdrop()
  61 {
  62         // draw sky
  63         Mat4 view_mat_inf = view_matrix.upper3x3();
  64         glPushMatrix();
  65         glLoadMatrixf(view_mat_inf[0]);
  66
  67         glDisable(GL_DEPTH_TEST);
  68         glDepthMask(0);
  69
  70         bind_program(sdr_skydome);
  71         mesh_skydome->draw();
  72
  73         glEnable(GL_DEPTH_TEST);
  74         glDepthMask(1);
  75
  76         glPopMatrix();
  77
  78         // draw grid
  79         Mat4 xform;
  80         xform.scaling(500.0);
  81         glPushMatrix();
  82         glMultMatrixf(xform[0]);
  83
  84         bind_program(sdr_grid);
  85         bind_texture(tex_grid);
  86
  87         glBegin(GL_QUADS);
  88         glNormal3f(0, 1, 0);
  89         glVertex3f(-1, 0, 1);
  90         glVertex3f(1, 0, 1);
  91         glVertex3f(1, 0, -1);
  92         glVertex3f(-1, 0, -1);
  93         glEnd();
  94
  95         glPopMatrix();
  96 }