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         if(!features.transform)
 101                 link();
 102 }
 103
 104 Program::Program(const string &vert, const string &frag)
 105 {
 106         init();
 107
 108         attach_shader_owned(new Shader(VERTEX_SHADER, vert));
 109         attach_shader_owned(new Shader(FRAGMENT_SHADER, frag));
 110         link();
 111 }
 112
 113 void Program::init()
 114 {
 115         static RequireExtension _ext("GL_ARB_shader_objects");
 116
 117         linked = false;
 118         id = glCreateProgramObjectARB();
 119 }
 120
 121 Program::~Program()
 122 {
 123         for(list<Shader *>::iterator i=owned_data.begin(); i!=owned_data.end(); ++i)
 124                 delete *i;
 125         glDeleteObjectARB(id);
 126 }
 127
 128 void Program::attach_shader(Shader &shader)
 129 {
 130         if(find(shaders.begin(), shaders.end(), &shader)==shaders.end())
 131         {
 132                 glAttachObjectARB(id, shader.get_id());
 133                 shaders.push_back(&shader);
 134         }
 135 }
 136
 137 void Program::attach_shader_owned(Shader *shader)
 138 {
 139         attach_shader(*shader);
 140         if(find(owned_data.begin(), owned_data.end(), shader)==owned_data.end())
 141                 owned_data.push_back(shader);
 142 }
 143
 144 void Program::detach_shader(Shader &shader)
 145 {
 146         list<Shader *>::iterator i = remove(shaders.begin(), shaders.end(), &shader);
 147         if(i!=shaders.end())
 148         {
 149                 shaders.erase(i, shaders.end());
 150                 glDetachObjectARB(id, shader.get_id());
 151         }
 152 }
 153
 154 void Program::add_standard_shaders(const StandardFeatures &features)
 155 {
 156         string flags = features.create_flags();
 157         string vertex_src = process_standard_source(standard_vertex_src, flags);
 158         string fragment_src = process_standard_source(standard_fragment_src, flags);
 159         attach_shader_owned(new Shader(VERTEX_SHADER, vertex_src));
 160         attach_shader_owned(new Shader(FRAGMENT_SHADER, fragment_src));
 161 }
 162
 163 string Program::process_standard_source(const char **source, const string &flags)
 164 {
 165         string result;
 166
 167         for(unsigned i=0; source[i+1]; i+=2)
 168         {
 169                 if(source[i])
 170                 {
 171                         bool cond = true;
 172                         char oper = '&';
 173                         for(const char *c=source[i]; *c; ++c)
 174                         {
 175                                 if(*c>='a' && *c<='z')
 176                                 {
 177                                         bool found = (flags.find(*c)!=string::npos);
 178                                         if(oper=='|')
 179                                                 cond = (cond || found);
 180                                         else if(oper=='!')
 181                                                 cond = (cond && !found);
 182                                         else if(oper=='&')
 183                                                 cond = (cond && found);
 184                                         oper = '&';
 185                                 }
 186                                 else
 187                                         oper = *c;
 188                         }
 189
 190                         if(!cond)
 191                                 continue;
 192                 }
 193
 194                 result += source[i+1];
 195         }
 196
 197         return result;
 198 }
 199
 200 void Program::bind_attribute(unsigned index, const string &name)
 201 {
 202         static RequireExtension _ext("GL_ARB_vertex_shader");
 203         glBindAttribLocationARB(id, index, name.c_str());
 204 }
 205
 206 void Program::link()
 207 {
 208         for(list<Shader *>::iterator i=shaders.begin(); i!=shaders.end(); ++i)
 209                 if(!(*i)->is_compiled())
 210                         (*i)->compile();
 211
 212         uniforms.clear();
 213
 214         glLinkProgramARB(id);
 215         int value;
 216         glGetObjectParameterivARB(id, GL_OBJECT_LINK_STATUS_ARB, &value);
 217         if(!(linked = value))
 218                 throw compile_error(get_info_log());
 219
 220         glGetObjectParameterivARB(id, GL_OBJECT_ACTIVE_UNIFORMS_ARB, &value);
 221         for(int i=0; i<value; ++i)
 222         {
 223                 UniformInfo info;
 224                 char name[128];
 225                 int len = 0;
 226                 glGetActiveUniformARB(id, i, 128, &len, &info.size, &info.type, name);
 227                 if(len)
 228                 {
 229                         info.name = name;
 230                         info.location = glGetUniformLocationARB(id, name);
 231                         uniforms[name] = info;
 232                 }
 233         }
 234 }
 235
 236 string Program::get_info_log() const
 237 {
 238         GLsizei len = 0;
 239         glGetObjectParameterivARB(id, GL_OBJECT_INFO_LOG_LENGTH_ARB, &len);
 240         char *buf = new char[len+1];
 241         glGetInfoLogARB(id, len+1, &len, buf);
 242         string log(buf, len);
 243         delete[] buf;
 244         return log;
 245 }
 246
 247 void Program::bind() const
 248 {
 249         if(!linked)
 250                 throw invalid_operation("Program::bind");
 251
 252         if(!set_current(this))
 253                 return;
 254
 255         glUseProgramObjectARB(id);
 256 }
 257
 258 int Program::get_uniform_location(const string &n) const
 259 {
 260         map<string, UniformInfo>::const_iterator i = uniforms.find(n);
 261         if(i==uniforms.end())
 262         {
 263                 if(n[n.size()-1]==']')
 264                 {
 265                         string::size_type open_bracket = n.rfind('[');
 266                         if(open_bracket!=string::npos)
 267                         {
 268                                 /* The requested name looks like an array.  glGetActiveUniform only
 269                                 gives us the first element of the array, so try to look that up and
 270                                 add an offset. */
 271                                 int offset = lexical_cast<unsigned>(n.substr(open_bracket+1, n.size()-2-open_bracket));
 272                                 i = uniforms.find(n.substr(0, open_bracket)+"[0]");
 273                                 if(i!=uniforms.end() && offset<i->second.size)
 274                                         return i->second.location+offset;
 275                         }
 276                 }
 277                 return -1;
 278         }
 279
 280         return i->second.location;
 281 }
 282
 283 void Program::unbind()
 284 {
 285         if(!set_current(0))
 286                 return;
 287
 288         glUseProgramObjectARB(0);
 289 }
 290
 291
 292 Program::StandardFeatures::StandardFeatures():
 293         texture(false),
 294         material(false),
 295         lighting(false),
 296         specular(false),
 297         normalmap(false),
 298         shadow(false),
 299         transform(false)
 300 { }
 301
 302 string Program::StandardFeatures::create_flags() const
 303 {
 304         string flags;
 305         if(texture)
 306                 flags += 't';
 307         if(material)
 308                 flags += 'm';
 309         if(lighting)
 310         {
 311                 flags += 'l';
 312                 if(specular)
 313                         flags += 'p';
 314                 if(normalmap)
 315                         flags += 'n';
 316         }
 317         if(shadow)
 318                 flags += 's';
 319         if(transform)
 320                 flags += 'r';
 321
 322         return flags;
 323 }
 324
 325
 326 Program::Loader::Loader(Program &p):
 327         DataFile::ObjectLoader<Program>(p)
 328 {
 329         add("attribute",       &Loader::attribute);
 330         add("fragment_shader", &Loader::fragment_shader);
 331         add("standard",        &Loader::standard);
 332         add("vertex_shader",   &Loader::vertex_shader);
 333 }
 334
 335 void Program::Loader::finish()
 336 {
 337         obj.link();
 338 }
 339
 340 void Program::Loader::attribute(unsigned i, const string &n)
 341 {
 342         obj.bind_attribute(i, n);
 343 }
 344
 345 void Program::Loader::fragment_shader(const string &src)
 346 {
 347         obj.attach_shader_owned(new Shader(FRAGMENT_SHADER, src));
 348 }
 349
 350 void Program::Loader::standard()
 351 {
 352         StandardFeatures feat;
 353         load_sub(feat);
 354         obj.add_standard_shaders(feat);
 355 }
 356
 357 void Program::Loader::vertex_shader(const string &src)
 358 {
 359         obj.attach_shader_owned(new Shader(VERTEX_SHADER, src));
 360 }
 361
 362
 363 Program::StandardFeatures::Loader::Loader(StandardFeatures &f):
 364         DataFile::ObjectLoader<StandardFeatures>(f)
 365 {
 366         add("lighting",  &StandardFeatures::lighting);
 367         add("material",  &StandardFeatures::material);
 368         add("normalmap", &StandardFeatures::normalmap);
 369         add("shadow",    &StandardFeatures::shadow);
 370         add("specular",  &StandardFeatures::specular);
 371         add("texture",   &StandardFeatures::texture);
 372         add("transform", &StandardFeatures::transform);
 373 }
 374
 375 } // namespace GL
 376 } // namespace Msp