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|e", "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         "nr",  "\tvec3 eye_tangent = transform_normal(tangent);\n",
  34         "n!r", "\tvec3 eye_tangent = gl_NormalMatrix*tangent;\n",
  35         "nr",  "\tvec3 eye_binormal = transform_normal(binormal);\n",
  36         "n!r", "\tvec3 eye_binormal = gl_NormalMatrix*binormal;\n",
  37         "l",   "\tvec3 eye_light_dir = normalize(gl_LightSource[0].position.xyz-eye_pos.xyz*gl_LightSource[0].position.w);\n",
  38         "n",   "\tv_light_dir = vec3(dot(eye_tangent, eye_light_dir), dot(eye_binormal, eye_light_dir), dot(eye_normal, eye_light_dir));\n",
  39         "l!n", "\tv_light_dir = eye_light_dir;\n",
  40         "p|e", "\tvec3 eye_dir = -normalize(eye_pos.xyz);\n",
  41         "p|en",  "\tv_eye_dir = vec3(dot(eye_tangent, eye_dir), dot(eye_binormal, eye_dir), dot(eye_normal, eye_dir));\n",
  42         "p|e!n", "\tv_eye_dir = eye_dir;\n",
  43         "t|n", "\tv_texcoord = gl_MultiTexCoord0.xy;\n",
  44         "s",   "\tv_shadowcoord = vec3(dot(gl_EyePlaneS[3], eye_pos), dot(gl_EyePlaneT[3], eye_pos), dot(gl_EyePlaneR[3], eye_pos));\n",
  45         "!lm", "\tv_color = gl_Color;\n",
  46          0,    "}",
  47         0, 0
  48 };
  49
  50 const char *standard_fragment_src[] =
  51 {
  52         "t",   "uniform sampler2D texture;\n",
  53         "n",   "uniform sampler2D normalmap;\n",
  54         "s",   "uniform sampler2DShadow shadow;\n",
  55         "e",   "uniform samplerCube environment;\n",
  56         "e",   "uniform float reflectivity;\n",
  57         "t|n", "varying vec2 v_texcoord;\n",
  58         "s",   "varying vec3 v_shadowcoord;\n",
  59         "!lm", "varying vec4 v_color;\n",
  60         "l!n", "varying vec3 v_normal;\n",
  61         "l",   "varying vec3 v_light_dir;\n",
  62         "p|e", "varying vec3 v_eye_dir;\n",
  63          0,    "void main()\n",
  64          0,    "{\n",
  65         "n",   "\tvec3 n_normal = texture2D(normalmap, v_texcoord).xyz*2.0-1.0;\n",
  66         "l!n", "\tvec3 n_normal = normalize(v_normal);\n",
  67         "l",   "\tfloat l_diffuse = max(dot(n_normal, normalize(v_light_dir)), 0.0);\n",
  68         "p",   "\tvec3 half_dir = normalize(v_eye_dir+v_light_dir);\n",
  69         "p",   "\tfloat l_specular = pow(max(dot(half_dir, n_normal), 0.0), gl_FrontMaterial.shininess);\n",
  70         "s",   "\tfloat l_shadow = shadow2D(shadow, v_shadowcoord).r;\n",
  71         /* XXX This is incorrect with normal mapping, since the vectors are in TBN
  72         space but environment map is expected to be in eye space */
  73         "e",   "\tvec4 reflection = textureCube(environment, n_normal*(dot(n_normal, v_eye_dir)*2.0)-v_eye_dir);\n",
  74          0,    "\tgl_FragColor = ",
  75         "!t!l!m", "vec4(1.0, 1.0, 1.0, 1.0)",
  76         "t",     "texture2D(texture, v_texcoord)",
  77         "l|mt",  "*",
  78         "!lm",   "v_color",
  79         "l",     "((l_diffuse",
  80         "lm",    "*gl_FrontLightProduct[0].diffuse",
  81         "p",     "+l_specular",
  82         "pm",    "*gl_FrontLightProduct[0].specular",
  83         "l",     ")",
  84         "s",     "*l_shadow",
  85         "lm",    "+gl_FrontLightModelProduct.sceneColor",
  86         "l",     ")",
  87         "e",     "+reflection*reflectivity",
  88          0,      ";\n",
  89          0,    "}\n",
  90         0, 0
  91 };
  92
  93 }
  94
  95 namespace Msp {
  96 namespace GL {
  97
  98 Program::Program()
  99 {
 100         init();
 101 }
 102
 103 Program::Program(const StandardFeatures &features)
 104 {
 105         init();
 106
 107         add_standard_shaders(features);
 108         if(!features.transform)
 109                 link();
 110 }
 111
 112 Program::Program(const string &vert, const string &frag)
 113 {
 114         init();
 115
 116         attach_shader_owned(new Shader(VERTEX_SHADER, vert));
 117         attach_shader_owned(new Shader(FRAGMENT_SHADER, frag));
 118         link();
 119 }
 120
 121 void Program::init()
 122 {
 123         static RequireExtension _ext("GL_ARB_shader_objects");
 124
 125         linked = false;
 126         id = glCreateProgramObjectARB();
 127 }
 128
 129 Program::~Program()
 130 {
 131         for(list<Shader *>::iterator i=owned_data.begin(); i!=owned_data.end(); ++i)
 132                 delete *i;
 133         glDeleteObjectARB(id);
 134 }
 135
 136 void Program::attach_shader(Shader &shader)
 137 {
 138         if(find(shaders.begin(), shaders.end(), &shader)==shaders.end())
 139         {
 140                 glAttachObjectARB(id, shader.get_id());
 141                 shaders.push_back(&shader);
 142         }
 143 }
 144
 145 void Program::attach_shader_owned(Shader *shader)
 146 {
 147         attach_shader(*shader);
 148         if(find(owned_data.begin(), owned_data.end(), shader)==owned_data.end())
 149                 owned_data.push_back(shader);
 150 }
 151
 152 void Program::detach_shader(Shader &shader)
 153 {
 154         list<Shader *>::iterator i = remove(shaders.begin(), shaders.end(), &shader);
 155         if(i!=shaders.end())
 156         {
 157                 shaders.erase(i, shaders.end());
 158                 glDetachObjectARB(id, shader.get_id());
 159         }
 160 }
 161
 162 void Program::add_standard_shaders(const StandardFeatures &features)
 163 {
 164         string flags = features.create_flags();
 165         string vertex_src = process_standard_source(standard_vertex_src, flags);
 166         string fragment_src = process_standard_source(standard_fragment_src, flags);
 167         attach_shader_owned(new Shader(VERTEX_SHADER, vertex_src));
 168         attach_shader_owned(new Shader(FRAGMENT_SHADER, fragment_src));
 169 }
 170
 171 string Program::process_standard_source(const char **source, const string &flags)
 172 {
 173         string result;
 174
 175         for(unsigned i=0; source[i+1]; i+=2)
 176         {
 177                 if(source[i])
 178                 {
 179                         bool cond = true;
 180                         char oper = '&';
 181                         for(const char *c=source[i]; *c; ++c)
 182                         {
 183                                 if(*c>='a' && *c<='z')
 184                                 {
 185                                         bool found = (flags.find(*c)!=string::npos);
 186                                         if(oper=='|')
 187                                                 cond = (cond || found);
 188                                         else if(oper=='!')
 189                                                 cond = (cond && !found);
 190                                         else if(oper=='&')
 191                                                 cond = (cond && found);
 192                                         oper = '&';
 193                                 }
 194                                 else
 195                                         oper = *c;
 196                         }
 197
 198                         if(!cond)
 199                                 continue;
 200                 }
 201
 202                 result += source[i+1];
 203         }
 204
 205         return result;
 206 }
 207
 208 void Program::bind_attribute(unsigned index, const string &name)
 209 {
 210         static RequireExtension _ext("GL_ARB_vertex_shader");
 211         glBindAttribLocationARB(id, index, name.c_str());
 212 }
 213
 214 void Program::link()
 215 {
 216         for(list<Shader *>::iterator i=shaders.begin(); i!=shaders.end(); ++i)
 217                 if(!(*i)->is_compiled())
 218                         (*i)->compile();
 219
 220         uniforms.clear();
 221
 222         glLinkProgramARB(id);
 223         int value;
 224         glGetObjectParameterivARB(id, GL_OBJECT_LINK_STATUS_ARB, &value);
 225         if(!(linked = value))
 226                 throw compile_error(get_info_log());
 227
 228         glGetObjectParameterivARB(id, GL_OBJECT_ACTIVE_UNIFORMS_ARB, &value);
 229         for(int i=0; i<value; ++i)
 230         {
 231                 UniformInfo info;
 232                 char name[128];
 233                 int len = 0;
 234                 glGetActiveUniformARB(id, i, 128, &len, &info.size, &info.type, name);
 235                 if(len)
 236                 {
 237                         info.name = name;
 238                         info.location = glGetUniformLocationARB(id, name);
 239                         uniforms[name] = info;
 240                 }
 241         }
 242 }
 243
 244 string Program::get_info_log() const
 245 {
 246         GLsizei len = 0;
 247         glGetObjectParameterivARB(id, GL_OBJECT_INFO_LOG_LENGTH_ARB, &len);
 248         char *buf = new char[len+1];
 249         glGetInfoLogARB(id, len+1, &len, buf);
 250         string log(buf, len);
 251         delete[] buf;
 252         return log;
 253 }
 254
 255 void Program::bind() const
 256 {
 257         if(!linked)
 258                 throw invalid_operation("Program::bind");
 259
 260         if(!set_current(this))
 261                 return;
 262
 263         glUseProgramObjectARB(id);
 264 }
 265
 266 int Program::get_uniform_location(const string &n) const
 267 {
 268         map<string, UniformInfo>::const_iterator i = uniforms.find(n);
 269         if(i==uniforms.end())
 270         {
 271                 if(n[n.size()-1]==']')
 272                 {
 273                         string::size_type open_bracket = n.rfind('[');
 274                         if(open_bracket!=string::npos)
 275                         {
 276                                 /* The requested name looks like an array.  glGetActiveUniform only
 277                                 gives us the first element of the array, so try to look that up and
 278                                 add an offset. */
 279                                 int offset = lexical_cast<unsigned>(n.substr(open_bracket+1, n.size()-2-open_bracket));
 280                                 i = uniforms.find(n.substr(0, open_bracket)+"[0]");
 281                                 if(i!=uniforms.end() && offset<i->second.size)
 282                                         return i->second.location+offset;
 283                         }
 284                 }
 285                 return -1;
 286         }
 287
 288         return i->second.location;
 289 }
 290
 291 void Program::unbind()
 292 {
 293         if(!set_current(0))
 294                 return;
 295
 296         glUseProgramObjectARB(0);
 297 }
 298
 299
 300 Program::StandardFeatures::StandardFeatures():
 301         texture(false),
 302         material(false),
 303         lighting(false),
 304         specular(false),
 305         normalmap(false),
 306         shadow(false),
 307         reflection(false),
 308         transform(false)
 309 { }
 310
 311 string Program::StandardFeatures::create_flags() const
 312 {
 313         string flags;
 314         if(texture)
 315                 flags += 't';
 316         if(material)
 317                 flags += 'm';
 318         if(lighting)
 319         {
 320                 flags += 'l';
 321                 if(specular)
 322                         flags += 'p';
 323                 if(normalmap)
 324                         flags += 'n';
 325         }
 326         if(shadow)
 327                 flags += 's';
 328         if(reflection)
 329                 flags += 'e';
 330         if(transform)
 331                 flags += 'r';
 332
 333         return flags;
 334 }
 335
 336
 337 Program::Loader::Loader(Program &p):
 338         DataFile::ObjectLoader<Program>(p)
 339 {
 340         add("attribute",       &Loader::attribute);
 341         add("fragment_shader", &Loader::fragment_shader);
 342         add("standard",        &Loader::standard);
 343         add("vertex_shader",   &Loader::vertex_shader);
 344 }
 345
 346 void Program::Loader::finish()
 347 {
 348         obj.link();
 349 }
 350
 351 void Program::Loader::attribute(unsigned i, const string &n)
 352 {
 353         obj.bind_attribute(i, n);
 354 }
 355
 356 void Program::Loader::fragment_shader(const string &src)
 357 {
 358         obj.attach_shader_owned(new Shader(FRAGMENT_SHADER, src));
 359 }
 360
 361 void Program::Loader::standard()
 362 {
 363         StandardFeatures feat;
 364         load_sub(feat);
 365         obj.add_standard_shaders(feat);
 366 }
 367
 368 void Program::Loader::vertex_shader(const string &src)
 369 {
 370         obj.attach_shader_owned(new Shader(VERTEX_SHADER, src));
 371 }
 372
 373
 374 Program::StandardFeatures::Loader::Loader(StandardFeatures &f):
 375         DataFile::ObjectLoader<StandardFeatures>(f)
 376 {
 377         add("lighting",  &StandardFeatures::lighting);
 378         add("material",  &StandardFeatures::material);
 379         add("normalmap", &StandardFeatures::normalmap);
 380         add("shadow",    &StandardFeatures::shadow);
 381         add("specular",  &StandardFeatures::specular);
 382         add("texture",   &StandardFeatures::texture);
 383         add("transform", &StandardFeatures::transform);
 384 }
 385
 386 } // namespace GL
 387 } // namespace Msp