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