git.mutantstargoat.com Git - demo/blob - src/renderer.cc

   1 #include <GL/glew.h>
   2 #include <gmath/gmath.h>
   3
   4 #include "global.h"
   5 #include "gfxapi.h"
   6
   7 #include "camera.h"
   8 #include "mesh.h"
   9 #include "meshgen.h"
  10 #include "object.h"
  11 #include "renderer.h"
  12 #include "scene.h"
  13 #include "shader.h"
  14 #include "shader_manager.h"
  15 #include "texture.h"
  16
  17 #undef DRAW_NORMALS
  18
  19 /* skybox */
  20
  21 static Mesh *skymesh; /* it will be used by many renderers => no destroy */
  22 static ShaderProgram *skyprog;
  23 static int viewproj_loc;
  24
  25 Renderer::Renderer()
  26 {
  27         scene = 0;
  28         camera = 0;
  29         sprog = 0;
  30
  31         skytex = 0;
  32         dskytex = 0;
  33
  34         fog_density = 0;
  35 }
  36
  37 Renderer::~Renderer()
  38 {
  39 }
  40
  41 bool Renderer::create()
  42 {
  43         //debug
  44         if(!(nprog = sdr_man->create_shader_program("debug.v.glsl", "debug.f.glsl"))) {
  45                 fprintf(stderr, "Failed to load debug shaders.\n");
  46         }
  47
  48         if(!(sprog = sdr_man->create_shader_program("default.v.glsl", "default.f.glsl"))) {
  49                 return false;
  50         }
  51
  52         /* getting material uniform locations: diffuse, specular, specular exponent (strength) */
  53
  54         diff_loc = sprog->get_uniform_location("diffuse");
  55         spec_loc = sprog->get_uniform_location("specular");
  56         shin_loc = sprog->get_uniform_location("shininess");
  57         fog_loc = sprog->get_uniform_location("fog_density");
  58
  59         /* uniform locations for matrices */
  60
  61         mmviewproj_loc = sprog->get_uniform_location("mmviewproj");
  62         mview_loc = sprog->get_uniform_location("mview");
  63
  64         return true;
  65 }
  66
  67 void Renderer::draw() const
  68 {
  69         if(!camera || !scene)
  70                 return;
  71
  72         if(skytex) {
  73                 draw_skybox();
  74         }
  75
  76         if(!sprog->link())
  77                 return;
  78
  79         sprog->use();
  80
  81         for(size_t i=0; i<scene->objects.size(); i++) {
  82                 draw_object(scene->objects[i]);
  83         }
  84 }
  85
  86 void Renderer::draw_object(Object *object) const
  87 {
  88         Material *m = object->material;
  89
  90         /* setting uniforms for material */
  91
  92         if(diff_loc != -1)
  93                 sprog->set_uniformf(diff_loc, m->diffuse.x, m->diffuse.y, m->diffuse.z, 1);
  94
  95         if(spec_loc != -1)
  96                 sprog->set_uniformf(spec_loc, m->specular.x, m->specular.y, m->specular.z, 1);
  97
  98         if(shin_loc != -1)
  99                 sprog->set_uniformf(shin_loc, m->shininess);
 100
 101         if(fog_loc != -1)
 102                 sprog->set_uniformf(fog_loc, fog_density);
 103
 104         /* texture */
 105
 106         if(m->dtex)
 107                 m->dtex->bind(0);
 108
 109         /* setting uniforms for matrices */
 110
 111         Mat4 mmviewproj = object->transform * camera->get_view_matrix() * mprojection;
 112         if(mmviewproj_loc != -1)
 113                 sprog->set_uniform_matrix(mmviewproj_loc, mmviewproj);
 114
 115         Mat4 mview = object->transform * camera->get_view_matrix();
 116         if(mview_loc != -1)
 117                 sprog->set_uniform_matrix(mview_loc, mview);
 118
 119         object->mesh->draw();
 120
 121         // debug
 122 #ifdef DRAW_NORMALS
 123         if(nprog) {
 124                 int loc = nprog->get_uniform_location("mmviewproj");
 125                 if(loc != -1) {
 126                         nprog->set_uniform_matrix(loc, mmviewproj);
 127                 }
 128                 nprog->use();
 129                 object->mesh->draw_normals(1.0);
 130         }
 131 #endif
 132 }
 133
 134 void Renderer::set_sky_tex(Texture *stex)
 135 {
 136         if(!skymesh) {
 137                 skymesh = gfx_create_mesh();
 138                 gen_geosphere(skymesh, 1, 0);
 139         }
 140         if(!skyprog) {
 141                 if(!(skyprog = sdr_man->create_shader_program("sky.v.glsl", "sky.f.glsl")))
 142                         return;
 143                 if((viewproj_loc = skyprog->get_uniform_location("mviewproj") == -1))
 144                         return;
 145         }
 146         skytex = stex;
 147 }
 148
 149 void Renderer::set_diffuse_sky_tex(Texture *dstex)
 150 {
 151         dskytex = dstex;
 152 }
 153
 154 void Renderer::draw_skybox() const
 155 {
 156         if(!skymesh || !skytex)
 157                 return;
 158
 159         gfx_zbuffer(false);
 160         gfx_cull_face(GFX_CULL_NONE);
 161
 162         skytex->bind();
 163         skyprog->use();
 164
 165         Mat4 mviewproj;
 166         mviewproj = camera->get_view_matrix().upper3x3() * mprojection;
 167         skyprog->set_uniform_matrix(viewproj_loc, mviewproj);
 168
 169         skymesh->draw();
 170
 171         gfx_cull_face(GFX_CULL_BACK);
 172         gfx_zbuffer(true);
 173 }