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 /* skybox */
  18
  19 static Mesh *skymesh; /* it will be used by many renderers => no destroy */
  20 static ShaderProgram *skyprog;
  21 static int viewproj_loc;
  22
  23 Renderer::Renderer()
  24 {
  25         scene = 0;
  26         camera = 0;
  27         sprog = 0;
  28
  29         skytex = 0;
  30         dskytex = 0;
  31 }
  32
  33 Renderer::~Renderer()
  34 {
  35 }
  36
  37 bool Renderer::create()
  38 {
  39         //debug
  40         if(!(nprog = sdr_man->create_shader_program("debug.v.glsl", "debug.f.glsl"))) {
  41                 fprintf(stderr, "Failed to load debug shaders.\n");
  42         }
  43
  44         if(!(sprog = sdr_man->create_shader_program("default.v.glsl", "default.f.glsl"))) {
  45                 return false;
  46         }
  47
  48         /* getting material uniform locations: diffuse, specular, specular exponent (strength) */
  49
  50         if((diff_loc = sprog->get_uniform_location("diffuse")) == -1) {
  51                 fprintf(stderr, "Invalid uniform location: can't find \"diffuse\".\n");
  52                 return false;
  53         }
  54
  55         if((spec_loc = sprog->get_uniform_location("specular")) == -1) {
  56                 fprintf(stderr, "Invalid uniform location: can't find \"specular\".\n");
  57                 return false;
  58         }
  59
  60         if((shin_loc = sprog->get_uniform_location("shininess")) == -1) {
  61                 fprintf(stderr, "Invalid uniform location: can't find \"shininess\".\n");
  62                 return false;
  63         }
  64
  65         /* uniform locations for matrices */
  66
  67         if((mmviewproj_loc = sprog->get_uniform_location("mmviewproj")) == -1) {
  68                 fprintf(stderr, "Invalid uniform location: can't find \"mmviewproj\".\n");
  69                 return false;
  70         }
  71
  72         if((mview_loc = sprog->get_uniform_location("mview")) == -1) {
  73                 fprintf(stderr, "Invalid uniform location: can't find \"mview\".\n");
  74                 return false;
  75         }
  76
  77         return true;
  78 }
  79
  80 void Renderer::draw() const
  81 {
  82         if(!camera || !scene)
  83                 return;
  84
  85         if(skytex) {
  86                 draw_skybox();
  87         }
  88
  89         if(!sprog->link())
  90                 return;
  91
  92         sprog->use();
  93
  94         for(size_t i=0; i<scene->objects.size(); i++) {
  95                 draw_object(scene->objects[i]);
  96         }
  97 }
  98
  99 void Renderer::draw_object(Object *object) const
 100 {
 101         Material *m = object->material;
 102
 103         /* setting uniforms for material */
 104
 105         sprog->set_uniformf(diff_loc, m->diffuse.x, m->diffuse.y, m->diffuse.z, 1);
 106         sprog->set_uniformf(spec_loc, m->specular.x, m->specular.y, m->specular.z, 1);
 107         sprog->set_uniformf(shin_loc, m->shininess);
 108
 109         /* texture */
 110
 111         if(m->dtex)
 112                 m->dtex->bind();
 113
 114         /* setting uniforms for matrices */
 115
 116         Mat4 mmviewproj = object->transform * camera->get_view_matrix() * mprojection;
 117         sprog->set_uniform_matrix(mmviewproj_loc, mmviewproj);
 118
 119         Mat4 mview = object->transform * camera->get_view_matrix();
 120         sprog->set_uniform_matrix(mview_loc, mview);
 121
 122         object->mesh->update_vertex_data();
 123         object->mesh->draw();
 124
 125         /* debug */
 126         if(nprog) {
 127                 int loc = nprog->get_uniform_location("mmviewproj");
 128                 if(loc != -1) {
 129                         nprog->set_uniform_matrix(loc, mmviewproj);
 130                 }
 131                 nprog->use();
 132                 object->mesh->draw_normals(1.0);
 133         }
 134
 135         // if(m->dtex)
 136         //      m->dtex->unbind();
 137 }
 138
 139 void Renderer::set_sky_tex(Texture *stex)
 140 {
 141         if(!skymesh) {
 142                 skymesh = gfx_create_mesh();
 143                 gen_geosphere(skymesh, 1, 0);
 144         }
 145         if(!skyprog) {
 146                 if(!(skyprog = sdr_man->create_shader_program("sky.v.glsl", "sky.f.glsl")))
 147                         return;
 148                 if((viewproj_loc = skyprog->get_uniform_location("mviewproj") == -1))
 149                         return;
 150         }
 151         skytex = stex;
 152 }
 153
 154 void Renderer::set_diffuse_sky_tex(Texture *dstex)
 155 {
 156         dskytex = dstex;
 157 }
 158
 159 void Renderer::draw_skybox() const
 160 {
 161         if(!skymesh || !skytex)
 162                 return;
 163
 164         gfx_zbuffer(false);
 165         gfx_cull_face(GFX_CULL_NONE);
 166
 167         skytex->bind();
 168         skyprog->use();
 169
 170         Mat4 mviewproj;
 171         mviewproj = camera->get_view_matrix().upper3x3() * mprojection;
 172         skyprog->set_uniform_matrix(viewproj_loc, mviewproj);
 173
 174         skymesh->draw();
 175
 176         gfx_cull_face(GFX_CULL_BACK);
 177         gfx_zbuffer(true);
 178 }