source/core/pipelinestate.cpp

   1 #include <stdexcept>
   2 #include <msp/core/algorithm.h>
   3 #include <msp/gl/extensions/arb_direct_state_access.h>
   4 #include <msp/gl/extensions/arb_sampler_objects.h>
   5 #include <msp/gl/extensions/arb_shader_objects.h>
   6 #include <msp/gl/extensions/arb_uniform_buffer_object.h>
   7 #include <msp/gl/extensions/arb_vertex_array_object.h>
   8 #include "buffer.h"
   9 #include "deviceinfo.h"
  10 #include "pipelinestate.h"
  11 #include "program.h"
  12 #include "texture.h"
  13 #include "uniformblock.h"
  14 #include "vertexsetup.h"
  15
  16 using namespace std;
  17
  18 namespace Msp {
  19 namespace GL {
  20
  21 const PipelineState *PipelineState::last_applied = 0;
  22 vector<int> PipelineState::bound_tex_targets;
  23
  24 PipelineState::PipelineState():
  25         shprog(0),
  26         vertex_setup(0),
  27         front_face(COUNTERCLOCKWISE),
  28         face_cull(NO_CULL),
  29         enabled_clip_planes(0),
  30         changes(0)
  31 {
  32         if(!ARB_direct_state_access && bound_tex_targets.empty())
  33                 bound_tex_targets.resize(Limits::get_global().max_texture_bindings);
  34 }
  35
  36 PipelineState::~PipelineState()
  37 {
  38         if(this==last_applied)
  39                 last_applied = 0;
  40 }
  41
  42 void PipelineState::set_shader_program(const Program *p)
  43 {
  44         if(p!=shprog)
  45         {
  46                 shprog = p;
  47                 changes |= SHPROG;
  48         }
  49 }
  50
  51 void PipelineState::set_vertex_setup(const VertexSetup *s)
  52 {
  53         if(s!=vertex_setup)
  54         {
  55                 vertex_setup = s;
  56                 changes |= VERTEX_SETUP;
  57         }
  58 }
  59
  60 void PipelineState::set_front_face(FaceWinding w)
  61 {
  62         if(w!=front_face)
  63         {
  64                 front_face = w;
  65                 changes |= FACE_CULL;
  66         }
  67 }
  68
  69 void PipelineState::set_face_cull(CullMode c)
  70 {
  71         if(c!=face_cull)
  72         {
  73                 face_cull = c;
  74                 changes |= FACE_CULL;
  75         }
  76 }
  77
  78 void PipelineState::set_enabled_clip_planes(unsigned p)
  79 {
  80         if(p!=enabled_clip_planes)
  81         {
  82                 enabled_clip_planes = p;
  83                 changes |= CLIP_PLANES;
  84         }
  85 }
  86
  87 void PipelineState::set_texture(unsigned binding, const Texture *tex, const Sampler *samp)
  88 {
  89         if((tex!=0)!=(samp!=0))
  90                 throw invalid_argument("PipelineState::set_texture");
  91
  92         vector<BoundTexture>::iterator i = lower_bound_member(textures, binding, &BoundTexture::binding);
  93         if(i==textures.end() || i->binding!=binding)
  94                 i = textures.insert(i, BoundTexture(binding));
  95         if(tex!=i->texture || samp!=i->sampler)
  96         {
  97                 i->texture = tex;
  98                 i->sampler = samp;
  99                 i->changed = true;
 100                 changes |= TEXTURES;
 101         }
 102 }
 103
 104 void PipelineState::set_uniforms(const DefaultUniformBlock *block)
 105 {
 106         set_uniform_block_(-1, block);
 107 }
 108
 109 void PipelineState::set_uniform_block(unsigned binding, const BufferBackedUniformBlock *block)
 110 {
 111         set_uniform_block_(binding, block);
 112 }
 113
 114 void PipelineState::set_uniform_block_(int binding, const UniformBlock *block)
 115 {
 116         vector<BoundUniformBlock>::iterator i = lower_bound_member(uniform_blocks, binding, &BoundUniformBlock::binding);
 117         if(i==uniform_blocks.end() || i->binding!=binding)
 118                 i = uniform_blocks.insert(i, BoundUniformBlock(binding));
 119         if(block!=i->block || binding<0)
 120         {
 121                 i->block = block;
 122                 i->changed = true;
 123                 changes |= UNIFORMS;
 124         }
 125 }
 126
 127 void PipelineState::apply() const
 128 {
 129         apply(this==last_applied ? changes : ~0U);
 130 }
 131
 132 void PipelineState::apply(unsigned mask) const
 133 {
 134         if(mask&SHPROG)
 135                 glUseProgram(shprog ? shprog->get_id() : 0);
 136
 137         if(mask&VERTEX_SETUP)
 138         {
 139                 glBindVertexArray(vertex_setup ? vertex_setup->get_id() : 0);
 140                 if(vertex_setup)
 141                         vertex_setup->refresh();
 142         }
 143
 144         if(mask&FACE_CULL)
 145         {
 146                 glFrontFace(front_face==CLOCKWISE ? GL_CW : GL_CCW);
 147
 148                 if(face_cull!=NO_CULL)
 149                 {
 150                         glEnable(GL_CULL_FACE);
 151                         glCullFace(face_cull==CULL_FRONT ? GL_FRONT : GL_BACK);
 152                 }
 153                 else
 154                         glDisable(GL_CULL_FACE);
 155         }
 156
 157         if(mask&CLIP_PLANES)
 158         {
 159                 unsigned max_clip_planes = Limits::get_global().max_clip_planes;
 160                 for(unsigned i=0; i<max_clip_planes; ++i)
 161                 {
 162                         if((enabled_clip_planes>>i)&1)
 163                                 glEnable(GL_CLIP_PLANE0+i);
 164                         else
 165                                 glDisable(GL_CLIP_PLANE0+i);
 166                 }
 167         }
 168
 169         if(mask&TEXTURES)
 170         {
 171                 if(last_applied && this!=last_applied)
 172                 {
 173                         vector<BoundTexture>::const_iterator i = textures.begin();
 174                         vector<BoundTexture>::const_iterator j = last_applied->textures.begin();
 175                         while(j!=last_applied->textures.end())
 176                         {
 177                                 if(i==textures.end() || j->binding<i->binding)
 178                                 {
 179                                         if(bound_tex_targets[j->binding])
 180                                         {
 181                                                 if(ARB_direct_state_access)
 182                                                         glBindTextureUnit(j->binding, 0);
 183                                                 else
 184                                                 {
 185                                                         glActiveTexture(GL_TEXTURE0+j->binding);
 186                                                         glBindTexture(bound_tex_targets[j->binding], 0);
 187                                                 }
 188                                         }
 189                                         ++j;
 190                                 }
 191                                 else
 192                                 {
 193                                         if(i->binding==j->binding)
 194                                                 ++j;
 195                                         ++i;
 196                                 }
 197                         }
 198                 }
 199
 200                 for(vector<BoundTexture>::const_iterator i=textures.begin(); i!=textures.end(); ++i)
 201                         if(i->changed)
 202                         {
 203                                 if(i->texture && i->sampler)
 204                                 {
 205                                         if(ARB_direct_state_access)
 206                                                 glBindTextureUnit(i->binding, i->texture->get_id());
 207                                         else
 208                                         {
 209                                                 glActiveTexture(GL_TEXTURE0+i->binding);
 210                                                 if(bound_tex_targets[i->binding] && static_cast<int>(i->texture->get_target())!=bound_tex_targets[i->binding])
 211                                                         glBindTexture(bound_tex_targets[i->binding], 0);
 212                                                 glBindTexture(i->texture->get_target(), i->texture->get_id());
 213                                                 bound_tex_targets[i->binding] = i->texture->get_target();
 214                                         }
 215
 216                                         glBindSampler(i->binding, i->sampler->get_id());
 217                                         i->sampler->refresh();
 218                                 }
 219                                 else if(bound_tex_targets[i->binding])
 220                                 {
 221                                         if(ARB_direct_state_access)
 222                                                 glBindTextureUnit(i->binding, 0);
 223                                         else
 224                                         {
 225                                                 glActiveTexture(GL_TEXTURE0+i->binding);
 226                                                 glBindTexture(bound_tex_targets[i->binding], 0);
 227                                                 bound_tex_targets[i->binding] = 0;
 228                                         }
 229                                 }
 230
 231                                 i->changed = false;
 232                         }
 233         }
 234
 235         if(mask&UNIFORMS)
 236         {
 237                 if(last_applied && this!=last_applied)
 238                 {
 239                         vector<BoundUniformBlock>::const_iterator i = uniform_blocks.begin();
 240                         vector<BoundUniformBlock>::const_iterator j = last_applied->uniform_blocks.begin();
 241                         while(j!=last_applied->uniform_blocks.end())
 242                         {
 243                                 if(i==uniform_blocks.end() || j->binding<i->binding)
 244                                 {
 245                                         glBindBufferBase(GL_UNIFORM_BUFFER, j->binding, 0);
 246                                         ++j;
 247                                 }
 248                                 else
 249                                 {
 250                                         if(i->binding==j->binding)
 251                                                 ++j;
 252                                         ++i;
 253                                 }
 254                         }
 255                 }
 256
 257                 for(vector<BoundUniformBlock>::const_iterator i=uniform_blocks.begin(); i!=uniform_blocks.end(); ++i)
 258                         if(i->changed)
 259                         {
 260                                 if(i->block)
 261                                 {
 262                                         if(i->binding>=0)
 263                                         {
 264                                                 const BufferBackedUniformBlock *block = static_cast<const BufferBackedUniformBlock *>(i->block);
 265                                                 glBindBufferRange(GL_UNIFORM_BUFFER, i->binding, block->get_buffer()->get_id(), block->get_offset(), block->get_data_size());
 266                                         }
 267                                         else
 268                                                 static_cast<const DefaultUniformBlock *>(i->block)->apply();
 269                                 }
 270                                 else
 271                                         glBindBufferBase(GL_UNIFORM_BUFFER, i->binding, 0);
 272
 273                                 i->changed = false;
 274                         }
 275         }
 276
 277         last_applied = this;
 278         changes &= ~mask;
 279 }
 280
 281 void PipelineState::clear()
 282 {
 283         if(last_applied)
 284         {
 285                 glUseProgram(0);
 286                 glBindVertexArray(0);
 287
 288                 unsigned max_clip_planes = Limits::get_global().max_clip_planes;
 289                 for(unsigned i=0; i<max_clip_planes; ++i)
 290                         if((last_applied->enabled_clip_planes>>i)&1)
 291                                 glDisable(GL_CLIP_PLANE0+i);
 292
 293                 for(vector<BoundTexture>::const_iterator i=last_applied->textures.begin(); i!=last_applied->textures.end(); ++i)
 294                         if(i->texture && i->sampler)
 295                         {
 296                                 if(ARB_direct_state_access)
 297                                         glBindTextureUnit(i->binding, 0);
 298                                 else
 299                                 {
 300                                         glActiveTexture(GL_TEXTURE0+i->binding);
 301                                         glBindTexture(bound_tex_targets[i->binding], 0);
 302                                         bound_tex_targets[i->binding] = 0;
 303                                 }
 304                         }
 305
 306                 for(vector<BoundUniformBlock>::const_iterator i=last_applied->uniform_blocks.begin(); i!=last_applied->uniform_blocks.end(); ++i)
 307                         if(i->block)
 308                                 glBindBufferBase(GL_UNIFORM_BUFFER, i->binding, 0);
 309
 310                 last_applied = 0;
 311         }
 312 }
 313
 314
 315 PipelineState::BoundTexture::BoundTexture(unsigned b):
 316         binding(b),
 317         changed(false),
 318         texture(0),
 319         sampler(0)
 320 { }
 321
 322
 323 PipelineState::BoundUniformBlock::BoundUniformBlock(int b):
 324         binding(b),
 325         changed(false),
 326         block(0)
 327 { }
 328
 329 } // namespace GL
 330 } // namespace Msp