source/glstate.cpp

   1 /* $Id$
   2
   3 This file is part of gldbg
   4 Copyright © 2009-2010  Mikko Rasa, Mikkosoft Productions
   5 Distributed under the GPL
   6 */
   7
   8 #include <msp/core/except.h>
   9 #include "glstate.h"
  10
  11 using namespace std;
  12 using namespace Msp;
  13
  14 namespace {
  15
  16 template<typename T>
  17 float normalize(T v);
  18
  19 template<>
  20 float normalize<GLubyte>(GLubyte v)
  21 { return v/255.0f; }
  22
  23 template<>
  24 float normalize<GLbyte>(GLbyte v)
  25 { return (2*v+1)/255.0f; }
  26
  27 template<typename T, void (*func)(void *, float)>
  28 void wrap_normalized(void *user_data, T v0)
  29 { func(user_data, v0); }
  30
  31 template<typename T, void (*func)(void *, float, float)>
  32 void wrap_normalized(void *user_data, T v0, T v1)
  33 { func(user_data, v0, v1); }
  34
  35 template<typename T, void (*func)(void *, float, float, float)>
  36 void wrap_normalized(void *user_data, T v0, T v1, T v2)
  37 { func(user_data, v0, v1, v2); }
  38
  39 template<typename T, void (*func)(void *, float, float, float, float)>
  40 void wrap_normalized(void *user_data, T v0, T v1, T v2, T v3)
  41 { func(user_data, v0, v1, v2, v3); }
  42
  43 template<typename T, void (*func)(void *, T)>
  44 void wrap_array(void *user_data, const T *v)
  45 { func(user_data, v[0]); }
  46
  47 template<typename T, void (*func)(void *, T, T)>
  48 void wrap_array(void *user_data, const T *v)
  49 { func(user_data, v[0], v[1]); }
  50
  51 template<typename T, void (*func)(void *, T, T, T)>
  52 void wrap_array(void *user_data, const T *v)
  53 { func(user_data, v[0], v[1], v[2]); }
  54
  55 template<typename T, void (*func)(void *, T, T, T, T)>
  56 void wrap_array(void *user_data, const T *v)
  57 { func(user_data, v[0], v[1], v[2], v[3]); }
  58
  59 }
  60
  61
  62 Vector3::Vector3():
  63         x(0), y(0), z(0)
  64 { }
  65
  66
  67 Vector4::Vector4():
  68         x(0), y(0), z(0), w(1)
  69 { }
  70
  71
  72 GlState::GlState():
  73         decoder(gldecoder_new(this, NULL)),
  74         active_tex(0),
  75         client_active_tex(0),
  76         array_buffer(0),
  77         element_buffer(0)
  78 {
  79         vertex_array.kind = GL_VERTEX_ARRAY;
  80         normal_array.kind = GL_NORMAL_ARRAY;
  81         color_array.kind = GL_COLOR_ARRAY;
  82         for(unsigned i=0; i<8; ++i)
  83         {
  84                 texcoord_arrays[i].kind = GL_TEXTURE_COORD_ARRAY;
  85                 texcoord_arrays[i].index = i;
  86         }
  87
  88         decoder->glColor3ub = wrap_normalized<GLubyte, glColor3f>;
  89         decoder->glColor3ubv = wrap_array<GLubyte, wrap_normalized<GLubyte, glColor3f> >;
  90         decoder->glColor4ub = wrap_normalized<GLubyte, glColor4f>;
  91         decoder->glColor4ubv = wrap_array<GLubyte, wrap_normalized<GLubyte, glColor4f> >;
  92         decoder->glColor3f = glColor3f;
  93         decoder->glColor3fv = wrap_array<float, glColor3f>;
  94         decoder->glColor4f = glColor4f;
  95         decoder->glColor4fv = wrap_array<float, glColor4f>;
  96         decoder->glTexCoord1f = glTexCoord1f;
  97         decoder->glTexCoord1fv = wrap_array<float, glTexCoord1f>;
  98         decoder->glTexCoord2f = glTexCoord2f;
  99         decoder->glTexCoord2fv = wrap_array<float, glTexCoord2f>;
 100         decoder->glTexCoord3f = glTexCoord3f;
 101         decoder->glTexCoord3fv = wrap_array<float, glTexCoord3f>;
 102         decoder->glTexCoord4f = glTexCoord4f;
 103         decoder->glTexCoord4fv = wrap_array<float, glTexCoord4f>;
 104         decoder->glNormal3f = glNormal3f;
 105         decoder->glNormal3fv = wrap_array<float, glNormal3f>;
 106
 107         decoder->glActiveTexture = glActiveTexture;
 108         decoder->glActiveTextureARB = glActiveTexture;
 109         decoder->glBindTexture = glBindTexture;
 110         decoder->glTexImage2D = glTexImage2D;
 111         decoder->glTexParameteri = glTexParameteri;
 112         decoder->glTexParameteriv = glTexParameteriv;
 113         decoder->glDeleteTextures = glDeleteTextures;
 114
 115         decoder->glVertexPointer = glVertexPointer;
 116         decoder->glNormalPointer = glNormalPointer;
 117         decoder->glColorPointer = glColorPointer;
 118         decoder->glClientActiveTexture = glClientActiveTexture;
 119         decoder->glClientActiveTextureARB = glClientActiveTexture;
 120         decoder->glTexCoordPointer = glTexCoordPointer;
 121
 122         decoder->glBindBuffer = glBindBuffer;
 123         decoder->glBindBufferARB = glBindBuffer;
 124         decoder->glBufferData = glBufferData;
 125         decoder->glBufferDataARB = glBufferData;
 126         decoder->glBufferSubData = glBufferSubData;
 127         decoder->glBufferSubDataARB = glBufferSubData;
 128         decoder->glDeleteBuffers = glDeleteBuffers;
 129         decoder->glDeleteBuffersARB = glDeleteBuffers;
 130 }
 131
 132 GlState::~GlState()
 133 {
 134         gldecoder_delete(decoder);
 135 }
 136
 137 int GlState::decode(const char *data, unsigned len)
 138 {
 139         return gldecoder_decode(decoder, data, len);
 140 }
 141
 142 const TextureState &GlState::get_texture(unsigned id) const
 143 {
 144         TextureMap::const_iterator i = textures.find(id);
 145         if(i==textures.end())
 146                 throw KeyError("Unknown texture");
 147         return i->second;
 148 }
 149
 150 const BufferState &GlState::get_buffer(unsigned id) const
 151 {
 152         BufferMap::const_iterator i = buffers.find(id);
 153         if(i==buffers.end())
 154                 throw KeyError("Unknown buffer");
 155         return i->second;
 156 }
 157
 158 const BufferState *GlState::get_current_buffer(GLenum target) const
 159 {
 160         return const_cast<GlState *>(this)->get_current_buffer(target);
 161 }
 162
 163 bool &GlState::get_boolean_state(GLenum state)
 164 {
 165         if(state==GL_VERTEX_ARRAY)
 166                 return vertex_array.enabled;
 167         else if(state==GL_NORMAL_ARRAY)
 168                 return normal_array.enabled;
 169         else if(state==GL_COLOR_ARRAY)
 170                 return color_array.enabled;
 171         else if(state==GL_TEXTURE_COORD_ARRAY)
 172                 return texcoord_arrays[client_active_tex].enabled;
 173
 174         static bool dummy;
 175         return dummy;
 176 }
 177
 178 TextureState *GlState::get_current_texture(GLenum target)
 179 {
 180         return texunits[active_tex].get_current_texture(target);
 181 }
 182
 183 BufferState *GlState::get_current_buffer(GLenum target)
 184 {
 185         if(target==GL_ARRAY_BUFFER)
 186                 return array_buffer;
 187         else if(target==GL_ELEMENT_ARRAY_BUFFER)
 188                 return element_buffer;
 189         return 0;
 190 }
 191
 192 const ArrayState &GlState::get_array(GLenum array) const
 193 {
 194         if(array==GL_VERTEX_ARRAY)
 195                 return vertex_array;
 196         else if(array==GL_NORMAL_ARRAY)
 197                 return normal_array;
 198         else if(array==GL_COLOR_ARRAY)
 199                 return color_array;
 200         else if(array==GL_TEXTURE_COORD_ARRAY)
 201                 return texcoord_arrays[client_active_tex];
 202         else
 203                 throw InvalidParameterValue("Invalid array");
 204 }
 205
 206 const ArrayState &GlState::get_texture_coord_array(unsigned index) const
 207 {
 208         return texcoord_arrays[index];
 209 }
 210
 211 const ArrayState &GlState::get_attrib_array(unsigned index) const
 212 {
 213         map<unsigned, ArrayState>::const_iterator i = attrib_arrays.find(index);
 214         if(i!=attrib_arrays.end())
 215                 return i->second;
 216
 217         // XXX Return a dummy?
 218         throw KeyError("Unknown attribute array");
 219 }
 220
 221 void GlState::set_current_texture(GLenum target, unsigned id)
 222 {
 223         TexUnitState &unit = texunits[active_tex];
 224         TextureState *tex = 0;
 225         if(id)
 226         {
 227                 tex = &textures[id];
 228                 if(!tex->id)
 229                 {
 230                         tex->id = id;
 231                         tex->target = target;
 232                 }
 233                 else if(tex->target!=target)
 234                         return;
 235         }
 236         unit.set_current_texture(target, tex);
 237 }
 238
 239 void GlState::set_current_buffer(GLenum target, unsigned id)
 240 {
 241         BufferState *buf = 0;
 242         if(id)
 243         {
 244                 buf = &buffers[id];
 245                 if(!buf->id)
 246                         buf->id = id;
 247         }
 248
 249         if(target==GL_ARRAY_BUFFER)
 250                 array_buffer = buf;
 251         else if(target==GL_ELEMENT_ARRAY_BUFFER)
 252                 element_buffer = buf;
 253 }
 254
 255 // Boolean state
 256
 257 void GlState::glEnableClientState(void *user_data, GLenum state)
 258 {
 259         reinterpret_cast<GlState *>(user_data)->get_boolean_state(state) = true;
 260 }
 261
 262 void GlState::glDisableClientState(void *user_data, GLenum state)
 263 {
 264         reinterpret_cast<GlState *>(user_data)->get_boolean_state(state) = false;
 265 }
 266
 267 void GlState::glEnableVertexAttribArray(void *user_data, unsigned index)
 268 {
 269         reinterpret_cast<GlState *>(user_data)->attrib_arrays[index].enabled = true;
 270 }
 271
 272 void GlState::glDisableVertexAttribArray(void *user_data, unsigned index)
 273 {
 274         reinterpret_cast<GlState *>(user_data)->attrib_arrays[index].enabled = false;
 275 }
 276
 277 // Vertex attributes
 278
 279 void GlState::glColor3f(void *user_data, float r, float g, float b)
 280 { glColor4f(user_data, r, g, b, 1.0f); }
 281
 282 void GlState::glColor4f(void *user_data, float r, float g, float b, float a)
 283 {
 284         Vector4 &color = reinterpret_cast<GlState *>(user_data)->color;
 285         color.r = r;
 286         color.g = g;
 287         color.b = b;
 288         color.a = a;
 289 }
 290
 291 void GlState::glNormal3f(void *user_data, float x, float y, float z)
 292 {
 293         Vector3 &normal = reinterpret_cast<GlState *>(user_data)->normal;
 294         normal.x = x;
 295         normal.y = y;
 296         normal.z = z;
 297 }
 298
 299 void GlState::glTexCoord1f(void *user_data, float s)
 300 { glTexCoord4f(user_data, s, 0.0f, 0.0f, 1.0f); }
 301
 302 void GlState::glTexCoord2f(void *user_data, float s, float t)
 303 { glTexCoord4f(user_data, s, t, 0.0f, 1.0f); }
 304
 305 void GlState::glTexCoord3f(void *user_data, float s, float t, float p)
 306 { glTexCoord4f(user_data, s, t, p, 1.0f); }
 307
 308 void GlState::glTexCoord4f(void *user_data, float s, float t, float p, float q)
 309 {
 310         unsigned index = reinterpret_cast<GlState *>(user_data)->active_tex;
 311         glMultiTexCoord4f(user_data, index, s, t, p, q);
 312 }
 313
 314 void GlState::glMultiTexCoord4f(void *user_data, unsigned index, float s, float t, float p, float q)
 315 {
 316         Vector4 &texcoord = reinterpret_cast<GlState *>(user_data)->texcoord[index];
 317         texcoord.s = s;
 318         texcoord.t = t;
 319         texcoord.p = p;
 320         texcoord.q = q;
 321 }
 322
 323 // Textures
 324
 325 void GlState::glActiveTexture(void *user_data, unsigned index)
 326 {
 327         reinterpret_cast<GlState *>(user_data)->active_tex = index-GL_TEXTURE0;
 328 }
 329
 330 void GlState::glBindTexture(void *user_data, GLenum target, unsigned id)
 331 {
 332         reinterpret_cast<GlState *>(user_data)->set_current_texture(target, id);
 333 }
 334
 335 void GlState::glTexImage2D(void *user_data, GLenum target, int level, int ifmt, int width, int height, int, GLenum, GLenum, const void *)
 336 {
 337         if(TextureState *tex = reinterpret_cast<GlState *>(user_data)->get_current_texture(target))
 338                 tex->set_image_2d(level, ifmt, width, height);
 339 }
 340
 341 void GlState::glTexParameteri(void *user_data, GLenum target, GLenum param, int value)
 342 { glTexParameteriv(user_data, target, param, &value); }
 343
 344 void GlState::glTexParameteriv(void *user_data, GLenum target, GLenum param, const int *values)
 345 {
 346         if(TextureState *tex = reinterpret_cast<GlState *>(user_data)->get_current_texture(target))
 347                 tex->set_parameter(param, values);
 348 }
 349
 350 void GlState::glDeleteTextures(void *user_data, int count, const unsigned *ids)
 351 {
 352         for(int i=0; i<count; ++i)
 353                 reinterpret_cast<GlState *>(user_data)->textures.erase(ids[i]);
 354 }
 355
 356 // Vertex arrays
 357
 358 void GlState::glVertexPointer(void *user_data, int size, GLenum type, int stride, const void *data)
 359 {
 360         GlState *self = reinterpret_cast<GlState *>(user_data);
 361         self->vertex_array.set(size, type, false, stride, self->array_buffer, reinterpret_cast<long>(data));
 362 }
 363
 364 void GlState::glNormalPointer(void *user_data, GLenum type, int stride, const void *data)
 365 {
 366         GlState *self = reinterpret_cast<GlState *>(user_data);
 367         self->normal_array.set(3, type, true, stride, self->array_buffer, reinterpret_cast<long>(data));
 368 }
 369
 370 void GlState::glColorPointer(void *user_data, int size, GLenum type, int stride, const void *data)
 371 {
 372         GlState *self = reinterpret_cast<GlState *>(user_data);
 373         self->color_array.set(size, type, true, stride, self->array_buffer, reinterpret_cast<long>(data));
 374 }
 375
 376 void GlState::glClientActiveTexture(void *user_data, unsigned index)
 377 {
 378         reinterpret_cast<GlState *>(user_data)->client_active_tex = index-GL_TEXTURE0;
 379 }
 380
 381 void GlState::glTexCoordPointer(void *user_data, int size, GLenum type, int stride, const void *data)
 382 {
 383         GlState *self = reinterpret_cast<GlState *>(user_data);
 384         self->texcoord_arrays[self->client_active_tex].set(size, type, false, stride, self->array_buffer, reinterpret_cast<long>(data));
 385 }
 386
 387 void GlState::glVertexAttribPointer(void *user_data, unsigned index, int size, GLenum type, int norm, int stride, const void *data)
 388 {
 389         GlState *self = reinterpret_cast<GlState *>(user_data);
 390         self->attrib_arrays[index].set(size, type, norm, stride, self->array_buffer, reinterpret_cast<long>(data));
 391 }
 392
 393 // Buffer objects
 394
 395 void GlState::glBindBuffer(void *user_data, GLenum target, unsigned id)
 396 { reinterpret_cast<GlState *>(user_data)->set_current_buffer(target, id); }
 397
 398 void GlState::glBufferData(void *user_data, GLenum target, int size, const void *data, GLenum usage)
 399 {
 400         if(BufferState *buf = reinterpret_cast<GlState *>(user_data)->get_current_buffer(target))
 401                 buf->set_data(size, data, usage);
 402 }
 403
 404 void GlState::glBufferSubData(void *user_data, GLenum target, int offset, int size, const void *data)
 405 {
 406         if(BufferState *buf = reinterpret_cast<GlState *>(user_data)->get_current_buffer(target))
 407                 buf->set_sub_data(offset, size, data);
 408 }
 409
 410 void GlState::glDeleteBuffers(void *user_data, int count, const unsigned *ids)
 411 {
 412         for(int i=0; i<count; ++i)
 413                 reinterpret_cast<GlState *>(user_data)->buffers.erase(ids[i]);
 414 }