source/program.cpp

   1 #include <algorithm>
   2 #include "arb_shader_objects.h"
   3 #include "arb_vertex_shader.h"
   4 #include "error.h"
   5 #include "extension.h"
   6 #include "program.h"
   7 #include "shader.h"
   8
   9 using namespace std;
  10
  11 namespace {
  12
  13 const char *standard_vertex_src[] =
  14 {
  15         "n",   "attribute vec3 tangent;\n",
  16         "n",   "attribute vec3 binormal;\n",
  17         "t|n", "varying vec2 v_texcoord;\n",
  18         "s",   "varying vec3 v_shadowcoord;\n",
  19         "!lm", "varying vec4 v_color;\n",
  20         "l!n", "varying vec3 v_normal;\n",
  21         "l",   "varying vec3 v_light_dir;\n",
  22         "p",   "varying vec3 v_eye_dir;\n",
  23         "r",   "vec4 transform_vertex(vec4);\n",
  24         "lr",  "vec3 transform_normal(vec3);\n",
  25          0,    "void main()\n",
  26          0,    "{\n",
  27         "r",   "\tvec4 eye_pos = transform_vertex(gl_Vertex);\n",
  28         "!r",  "\tvec4 eye_pos = gl_ModelViewMatrix*gl_Vertex;\n",
  29          0,    "\tgl_Position = gl_ProjectionMatrix*eye_pos;\n",
  30         "lr",  "\tvec3 eye_normal = transform_normal(gl_Normal);\n",
  31         "l!r", "\tvec3 eye_normal = gl_NormalMatrix*gl_Normal;\n",
  32         "l!n", "\tv_normal = eye_normal;\n",
  33         "n",   "\tvec3 eye_tangent = gl_NormalMatrix*tangent;\n",
  34         "n",   "\tvec3 eye_binormal = gl_NormalMatrix*binormal;\n",
  35         "l",   "\tvec3 eye_light_dir = normalize(gl_LightSource[0].position.xyz-eye_pos.xyz*gl_LightSource[0].position.w);\n",
  36         "n",   "\tv_light_dir = vec3(dot(eye_tangent, eye_light_dir), dot(eye_binormal, eye_light_dir), dot(eye_normal, eye_light_dir));\n",
  37         "l!n", "\tv_light_dir = eye_light_dir;\n",
  38         "p",   "\tvec3 eye_dir = -normalize(eye_pos.xyz);\n",
  39         "pn",  "\tv_eye_dir = vec3(dot(eye_tangent, eye_dir), dot(eye_binormal, eye_dir), dot(eye_normal, eye_dir));\n",
  40         "p!n", "\tv_eye_dir = eye_dir;\n",
  41         "t|n", "\tv_texcoord = gl_MultiTexCoord0.xy;\n",
  42         "s",   "\tv_shadowcoord = vec3(dot(gl_EyePlaneS[3], eye_pos), dot(gl_EyePlaneT[3], eye_pos), dot(gl_EyePlaneR[3], eye_pos));\n",
  43         "!lm", "\tv_color = gl_Color;\n",
  44          0,    "}",
  45         0, 0
  46 };
  47
  48 const char *standard_fragment_src[] =
  49 {
  50         "t",   "uniform sampler2D texture;\n",
  51         "n",   "uniform sampler2D normalmap;\n",
  52         "s",   "uniform sampler2DShadow shadow;\n",
  53         "t|n", "varying vec2 v_texcoord;\n",
  54         "s",   "varying vec3 v_shadowcoord;\n",
  55         "!lm", "varying vec4 v_color;\n",
  56         "l!n", "varying vec3 v_normal;\n",
  57         "l",   "varying vec3 v_light_dir;\n",
  58         "p",   "varying vec3 v_eye_dir;\n",
  59          0,    "void main()\n",
  60          0,    "{\n",
  61         "n",   "\tvec3 n_normal = texture2D(normalmap, v_texcoord).xyz*2.0-1.0;\n",
  62         "l!n", "\tvec3 n_normal = normalize(v_normal);\n",
  63         "l",   "\tfloat l_diffuse = max(dot(n_normal, normalize(v_light_dir)), 0.0);\n",
  64         "p",   "\tvec3 half_dir = normalize(v_eye_dir+v_light_dir);\n",
  65         "p",   "\tfloat l_specular = pow(max(dot(half_dir, n_normal), 0.0), gl_FrontMaterial.shininess);\n",
  66         "s",   "\tfloat l_shadow = shadow2D(shadow, v_shadowcoord).r;\n",
  67          0,    "\tgl_FragColor = ",
  68         "!t!l!m", "vec4(1.0, 1.0, 1.0, 1.0)",
  69         "t",     "texture2D(texture, v_texcoord)",
  70         "l|mt",  "*",
  71         "!lm",   "v_color",
  72         "l",     "((l_diffuse",
  73         "lm",    "*gl_FrontLightProduct[0].diffuse",
  74         "p",     "+l_specular",
  75         "pm",    "*gl_FrontLightProduct[0].specular",
  76         "l",     ")",
  77         "s",     "*l_shadow",
  78         "lm",    "+gl_FrontLightModelProduct.sceneColor",
  79         "l",     ")",
  80          0,      ";\n",
  81          0,    "}\n",
  82         0, 0
  83 };
  84
  85 }
  86
  87 namespace Msp {
  88 namespace GL {
  89
  90 Program::Program()
  91 {
  92         init();
  93 }
  94
  95 Program::Program(const StandardFeatures &features)
  96 {
  97         init();
  98
  99         add_standard_shaders(features);
 100         link();
 101 }
 102
 103 Program::Program(const string &vert, const string &frag)
 104 {
 105         init();
 106
 107         attach_shader_owned(new Shader(VERTEX_SHADER, vert));
 108         attach_shader_owned(new Shader(FRAGMENT_SHADER, frag));
 109         link();
 110 }
 111
 112 void Program::init()
 113 {
 114         static RequireExtension _ext("GL_ARB_shader_objects");
 115
 116         linked = false;
 117         id = glCreateProgramObjectARB();
 118 }
 119
 120 Program::~Program()
 121 {
 122         for(list<Shader *>::iterator i=owned_data.begin(); i!=owned_data.end(); ++i)
 123                 delete *i;
 124         glDeleteObjectARB(id);
 125 }
 126
 127 void Program::attach_shader(Shader &shader)
 128 {
 129         if(find(shaders.begin(), shaders.end(), &shader)==shaders.end())
 130         {
 131                 glAttachObjectARB(id, shader.get_id());
 132                 shaders.push_back(&shader);
 133         }
 134 }
 135
 136 void Program::attach_shader_owned(Shader *shader)
 137 {
 138         attach_shader(*shader);
 139         if(find(owned_data.begin(), owned_data.end(), shader)==owned_data.end())
 140                 owned_data.push_back(shader);
 141 }
 142
 143 void Program::detach_shader(Shader &shader)
 144 {
 145         list<Shader *>::iterator i = remove(shaders.begin(), shaders.end(), &shader);
 146         if(i!=shaders.end())
 147         {
 148                 shaders.erase(i, shaders.end());
 149                 glDetachObjectARB(id, shader.get_id());
 150         }
 151 }
 152
 153 void Program::add_standard_shaders(const StandardFeatures &features)
 154 {
 155         string flags = features.create_flags();
 156         string vertex_src = process_standard_source(standard_vertex_src, flags);
 157         string fragment_src = process_standard_source(standard_fragment_src, flags);
 158         attach_shader_owned(new Shader(VERTEX_SHADER, vertex_src));
 159         attach_shader_owned(new Shader(FRAGMENT_SHADER, fragment_src));
 160 }
 161
 162 string Program::process_standard_source(const char **source, const string &flags)
 163 {
 164         string result;
 165
 166         for(unsigned i=0; source[i+1]; i+=2)
 167         {
 168                 if(source[i])
 169                 {
 170                         bool cond = true;
 171                         char oper = '&';
 172                         for(const char *c=source[i]; *c; ++c)
 173                         {
 174                                 if(*c>='a' && *c<='z')
 175                                 {
 176                                         bool found = (flags.find(*c)!=string::npos);
 177                                         if(oper=='|')
 178                                                 cond = (cond || found);
 179                                         else if(oper=='!')
 180                                                 cond = (cond && !found);
 181                                         else if(oper=='&')
 182                                                 cond = (cond && found);
 183                                         oper = '&';
 184                                 }
 185                                 else
 186                                         oper = *c;
 187                         }
 188
 189                         if(!cond)
 190                                 continue;
 191                 }
 192
 193                 result += source[i+1];
 194         }
 195
 196         return result;
 197 }
 198
 199 void Program::bind_attribute(unsigned index, const string &name)
 200 {
 201         static RequireExtension _ext("GL_ARB_vertex_shader");
 202         glBindAttribLocationARB(id, index, name.c_str());
 203 }
 204
 205 void Program::link()
 206 {
 207         for(list<Shader *>::iterator i=shaders.begin(); i!=shaders.end(); ++i)
 208                 if(!(*i)->is_compiled())
 209                         (*i)->compile();
 210
 211         uniforms.clear();
 212
 213         glLinkProgramARB(id);
 214         int value;
 215         glGetObjectParameterivARB(id, GL_OBJECT_LINK_STATUS_ARB, &value);
 216         if(!(linked = value))
 217                 throw compile_error(get_info_log());
 218
 219         glGetObjectParameterivARB(id, GL_OBJECT_ACTIVE_UNIFORMS_ARB, &value);
 220         for(int i=0; i<value; ++i)
 221         {
 222                 UniformInfo info;
 223                 char name[128];
 224                 int len = 0;
 225                 glGetActiveUniformARB(id, i, 128, &len, &info.size, &info.type, name);
 226                 if(len)
 227                 {
 228                         info.name = name;
 229                         info.location = glGetUniformLocationARB(id, name);
 230                         uniforms[name] = info;
 231                 }
 232         }
 233 }
 234
 235 string Program::get_info_log() const
 236 {
 237         GLsizei len = 0;
 238         glGetObjectParameterivARB(id, GL_OBJECT_INFO_LOG_LENGTH_ARB, &len);
 239         char *buf = new char[len+1];
 240         glGetInfoLogARB(id, len+1, &len, buf);
 241         string log(buf, len);
 242         delete[] buf;
 243         return log;
 244 }
 245
 246 void Program::bind() const
 247 {
 248         if(!linked)
 249                 throw invalid_operation("Program::bind");
 250
 251         if(!set_current(this))
 252                 return;
 253
 254         glUseProgramObjectARB(id);
 255 }
 256
 257 int Program::get_uniform_location(const string &n) const
 258 {
 259         map<string, UniformInfo>::const_iterator i = uniforms.find(n);
 260         if(i==uniforms.end())
 261                 return -1;
 262
 263         return i->second.location;
 264 }
 265
 266 void Program::unbind()
 267 {
 268         if(!set_current(0))
 269                 return;
 270
 271         glUseProgramObjectARB(0);
 272 }
 273
 274
 275 Program::StandardFeatures::StandardFeatures():
 276         texture(false),
 277         material(false),
 278         lighting(false),
 279         specular(false),
 280         normalmap(false),
 281         shadow(false),
 282         transform(false)
 283 { }
 284
 285 string Program::StandardFeatures::create_flags() const
 286 {
 287         string flags;
 288         if(texture)
 289                 flags += 't';
 290         if(material)
 291                 flags += 'm';
 292         if(lighting)
 293         {
 294                 flags += 'l';
 295                 if(specular)
 296                         flags += 'p';
 297                 if(normalmap)
 298                         flags += 'n';
 299         }
 300         if(shadow)
 301                 flags += 's';
 302         if(transform)
 303                 flags += 'r';
 304
 305         return flags;
 306 }
 307
 308
 309 Program::Loader::Loader(Program &p):
 310         DataFile::ObjectLoader<Program>(p)
 311 {
 312         add("attribute",       &Loader::attribute);
 313         add("fragment_shader", &Loader::fragment_shader);
 314         add("standard",        &Loader::standard);
 315         add("vertex_shader",   &Loader::vertex_shader);
 316 }
 317
 318 void Program::Loader::finish()
 319 {
 320         obj.link();
 321 }
 322
 323 void Program::Loader::attribute(unsigned i, const string &n)
 324 {
 325         obj.bind_attribute(i, n);
 326 }
 327
 328 void Program::Loader::fragment_shader(const string &src)
 329 {
 330         obj.attach_shader_owned(new Shader(FRAGMENT_SHADER, src));
 331 }
 332
 333 void Program::Loader::standard()
 334 {
 335         StandardFeatures feat;
 336         load_sub(feat);
 337         obj.add_standard_shaders(feat);
 338 }
 339
 340 void Program::Loader::vertex_shader(const string &src)
 341 {
 342         obj.attach_shader_owned(new Shader(VERTEX_SHADER, src));
 343 }
 344
 345
 346 Program::StandardFeatures::Loader::Loader(StandardFeatures &f):
 347         DataFile::ObjectLoader<StandardFeatures>(f)
 348 {
 349         add("lighting",  &StandardFeatures::lighting);
 350         add("material",  &StandardFeatures::material);
 351         add("normalmap", &StandardFeatures::normalmap);
 352         add("shadow",    &StandardFeatures::shadow);
 353         add("specular",  &StandardFeatures::specular);
 354         add("texture",   &StandardFeatures::texture);
 355         add("transform", &StandardFeatures::transform);
 356 }
 357
 358 } // namespace GL
 359 } // namespace Msp