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 "blend.h"
   9 #include "buffer.h"
  10 #include "deviceinfo.h"
  11 #include "depthtest.h"
  12 #include "pipelinestate.h"
  13 #include "program.h"
  14 #include "stenciltest.h"
  15 #include "texture.h"
  16 #include "uniformblock.h"
  17 #include "vertexsetup.h"
  18
  19 using namespace std;
  20
  21 namespace Msp {
  22 namespace GL {
  23
  24 const PipelineState *PipelineState::last_applied = 0;
  25 vector<int> PipelineState::bound_tex_targets;
  26
  27 PipelineState::PipelineState():
  28         shprog(0),
  29         vertex_setup(0),
  30         front_face(COUNTERCLOCKWISE),
  31         face_cull(NO_CULL),
  32         enabled_clip_planes(0),
  33         depth_test(0),
  34         stencil_test(0),
  35         blend(0),
  36         changes(0)
  37 {
  38         if(!ARB_direct_state_access && bound_tex_targets.empty())
  39                 bound_tex_targets.resize(Limits::get_global().max_texture_bindings);
  40 }
  41
  42 PipelineState::~PipelineState()
  43 {
  44         if(this==last_applied)
  45                 last_applied = 0;
  46 }
  47
  48 template<typename T>
  49 void PipelineState::set(T &target, T value, unsigned flag)
  50 {
  51         if(value!=target)
  52         {
  53                 target = value;
  54                 changes |= flag;
  55         }
  56 }
  57
  58 void PipelineState::set_shader_program(const Program *p)
  59 {
  60         set(shprog, p, SHPROG);
  61 }
  62
  63 void PipelineState::set_vertex_setup(const VertexSetup *s)
  64 {
  65         set(vertex_setup, s, VERTEX_SETUP);
  66 }
  67
  68 void PipelineState::set_front_face(FaceWinding w)
  69 {
  70         set(front_face, w, FACE_CULL);
  71 }
  72
  73 void PipelineState::set_face_cull(CullMode c)
  74 {
  75         set(face_cull, c, FACE_CULL);
  76 }
  77
  78 void PipelineState::set_enabled_clip_planes(unsigned p)
  79 {
  80         set(enabled_clip_planes, p, CLIP_PLANES);
  81 }
  82
  83 void PipelineState::set_texture(unsigned binding, const Texture *tex, const Sampler *samp)
  84 {
  85         if((tex!=0)!=(samp!=0))
  86                 throw invalid_argument("PipelineState::set_texture");
  87
  88         vector<BoundTexture>::iterator i = lower_bound_member(textures, binding, &BoundTexture::binding);
  89         if(i==textures.end() || i->binding!=binding)
  90                 i = textures.insert(i, BoundTexture(binding));
  91         if(tex!=i->texture || samp!=i->sampler)
  92         {
  93                 i->texture = tex;
  94                 i->sampler = samp;
  95                 i->changed = true;
  96                 changes |= TEXTURES;
  97         }
  98 }
  99
 100 void PipelineState::set_uniforms(const DefaultUniformBlock *block)
 101 {
 102         set_uniform_block_(-1, block);
 103 }
 104
 105 void PipelineState::set_uniform_block(unsigned binding, const BufferBackedUniformBlock *block)
 106 {
 107         set_uniform_block_(binding, block);
 108 }
 109
 110 void PipelineState::set_uniform_block_(int binding, const UniformBlock *block)
 111 {
 112         vector<BoundUniformBlock>::iterator i = lower_bound_member(uniform_blocks, binding, &BoundUniformBlock::binding);
 113         if(i==uniform_blocks.end() || i->binding!=binding)
 114                 i = uniform_blocks.insert(i, BoundUniformBlock(binding));
 115         if(block!=i->block || binding<0)
 116         {
 117                 i->block = block;
 118                 i->changed = true;
 119                 changes |= UNIFORMS;
 120         }
 121 }
 122
 123 void PipelineState::set_depth_test(const DepthTest *dt)
 124 {
 125         set(depth_test, dt, DEPTH_TEST);
 126 }
 127
 128 void PipelineState::set_stencil_test(const StencilTest *st)
 129 {
 130         set(stencil_test, st, STENCIL_TEST);
 131 }
 132
 133 void PipelineState::set_blend(const Blend *b)
 134 {
 135         set(blend, b, BLEND);
 136 }
 137
 138 void PipelineState::apply() const
 139 {
 140         apply(this==last_applied ? changes : ~0U);
 141 }
 142
 143 void PipelineState::apply(unsigned mask) const
 144 {
 145         if(mask&SHPROG)
 146                 glUseProgram(shprog ? shprog->get_id() : 0);
 147
 148         if(mask&VERTEX_SETUP)
 149         {
 150                 glBindVertexArray(vertex_setup ? vertex_setup->get_id() : 0);
 151                 if(vertex_setup)
 152                         vertex_setup->refresh();
 153         }
 154
 155         if(mask&FACE_CULL)
 156         {
 157                 glFrontFace(front_face==CLOCKWISE ? GL_CW : GL_CCW);
 158
 159                 if(face_cull!=NO_CULL && front_face!=NON_MANIFOLD)
 160                 {
 161                         glEnable(GL_CULL_FACE);
 162                         glCullFace(face_cull==CULL_FRONT ? GL_FRONT : GL_BACK);
 163                 }
 164                 else
 165                         glDisable(GL_CULL_FACE);
 166         }
 167
 168         if(mask&CLIP_PLANES)
 169         {
 170                 unsigned max_clip_planes = Limits::get_global().max_clip_planes;
 171                 for(unsigned i=0; i<max_clip_planes; ++i)
 172                 {
 173                         if((enabled_clip_planes>>i)&1)
 174                                 glEnable(GL_CLIP_PLANE0+i);
 175                         else
 176                                 glDisable(GL_CLIP_PLANE0+i);
 177                 }
 178         }
 179
 180         if(mask&TEXTURES)
 181         {
 182                 if(last_applied && this!=last_applied)
 183                 {
 184                         vector<BoundTexture>::const_iterator i = textures.begin();
 185                         vector<BoundTexture>::const_iterator j = last_applied->textures.begin();
 186                         while(j!=last_applied->textures.end())
 187                         {
 188                                 if(i==textures.end() || j->binding<i->binding)
 189                                 {
 190                                         if(bound_tex_targets[j->binding])
 191                                         {
 192                                                 if(ARB_direct_state_access)
 193                                                         glBindTextureUnit(j->binding, 0);
 194                                                 else
 195                                                 {
 196                                                         glActiveTexture(GL_TEXTURE0+j->binding);
 197                                                         glBindTexture(bound_tex_targets[j->binding], 0);
 198                                                 }
 199                                         }
 200                                         ++j;
 201                                 }
 202                                 else
 203                                 {
 204                                         if(i->binding==j->binding)
 205                                                 ++j;
 206                                         ++i;
 207                                 }
 208                         }
 209                 }
 210
 211                 for(vector<BoundTexture>::const_iterator i=textures.begin(); i!=textures.end(); ++i)
 212                         if(i->changed || mask==~0U)
 213                         {
 214                                 if(i->texture && i->sampler)
 215                                 {
 216                                         if(ARB_direct_state_access)
 217                                                 glBindTextureUnit(i->binding, i->texture->get_id());
 218                                         else
 219                                         {
 220                                                 glActiveTexture(GL_TEXTURE0+i->binding);
 221                                                 if(bound_tex_targets[i->binding] && static_cast<int>(i->texture->get_target())!=bound_tex_targets[i->binding])
 222                                                         glBindTexture(bound_tex_targets[i->binding], 0);
 223                                                 glBindTexture(i->texture->get_target(), i->texture->get_id());
 224                                                 bound_tex_targets[i->binding] = i->texture->get_target();
 225                                         }
 226
 227                                         glBindSampler(i->binding, i->sampler->get_id());
 228                                         i->sampler->refresh();
 229                                 }
 230                                 else if(bound_tex_targets[i->binding])
 231                                 {
 232                                         if(ARB_direct_state_access)
 233                                                 glBindTextureUnit(i->binding, 0);
 234                                         else
 235                                         {
 236                                                 glActiveTexture(GL_TEXTURE0+i->binding);
 237                                                 glBindTexture(bound_tex_targets[i->binding], 0);
 238                                                 bound_tex_targets[i->binding] = 0;
 239                                         }
 240                                 }
 241
 242                                 i->changed = false;
 243                         }
 244         }
 245
 246         if(mask&UNIFORMS)
 247         {
 248                 if(last_applied && this!=last_applied)
 249                 {
 250                         vector<BoundUniformBlock>::const_iterator i = uniform_blocks.begin();
 251                         vector<BoundUniformBlock>::const_iterator j = last_applied->uniform_blocks.begin();
 252                         while(j!=last_applied->uniform_blocks.end())
 253                         {
 254                                 if(i==uniform_blocks.end() || j->binding<i->binding)
 255                                 {
 256                                         glBindBufferBase(GL_UNIFORM_BUFFER, j->binding, 0);
 257                                         ++j;
 258                                 }
 259                                 else
 260                                 {
 261                                         if(i->binding==j->binding)
 262                                                 ++j;
 263                                         ++i;
 264                                 }
 265                         }
 266                 }
 267
 268                 for(vector<BoundUniformBlock>::const_iterator i=uniform_blocks.begin(); i!=uniform_blocks.end(); ++i)
 269                         if(i->changed || mask==~0U)
 270                         {
 271                                 if(i->block)
 272                                 {
 273                                         if(i->binding>=0)
 274                                         {
 275                                                 const BufferBackedUniformBlock *block = static_cast<const BufferBackedUniformBlock *>(i->block);
 276                                                 glBindBufferRange(GL_UNIFORM_BUFFER, i->binding, block->get_buffer()->get_id(), block->get_offset(), block->get_data_size());
 277                                         }
 278                                         else
 279                                                 static_cast<const DefaultUniformBlock *>(i->block)->apply();
 280                                 }
 281                                 else
 282                                         glBindBufferBase(GL_UNIFORM_BUFFER, i->binding, 0);
 283
 284                                 i->changed = false;
 285                         }
 286         }
 287
 288         if(mask&DEPTH_TEST)
 289         {
 290                 if(depth_test && depth_test->enabled)
 291                 {
 292                         glEnable(GL_DEPTH_TEST);
 293                         glDepthFunc(get_gl_predicate(depth_test->compare));
 294                 }
 295                 else
 296                         glDisable(GL_DEPTH_TEST);
 297
 298                 glDepthMask(!depth_test || depth_test->write);
 299         }
 300
 301         if(mask&STENCIL_TEST)
 302         {
 303                 if(stencil_test && stencil_test->enabled)
 304                 {
 305                         glEnable(GL_STENCIL_TEST);
 306                         glStencilFunc(get_gl_predicate(stencil_test->compare), stencil_test->reference, 0xFFFFFFFF);
 307                         glStencilOp(get_gl_stencil_op(stencil_test->stencil_fail_op), get_gl_stencil_op(stencil_test->depth_fail_op), get_gl_stencil_op(stencil_test->depth_pass_op));
 308                 }
 309                 else
 310                         glDisable(GL_STENCIL_TEST);
 311         }
 312
 313         if(mask&BLEND)
 314         {
 315                 if(blend && blend->enabled)
 316                 {
 317                         glEnable(GL_BLEND);
 318                         glBlendEquation(get_gl_blend_equation(blend->equation));
 319                         glBlendFunc(get_gl_blend_factor(blend->src_factor), get_gl_blend_factor(blend->dst_factor));
 320                         glBlendColor(blend->constant.r, blend->constant.g, blend->constant.b, blend->constant.a);
 321                 }
 322                 else
 323                         glDisable(GL_BLEND);
 324         }
 325
 326         last_applied = this;
 327         changes &= ~mask;
 328 }
 329
 330 void PipelineState::clear()
 331 {
 332         if(last_applied)
 333         {
 334                 glUseProgram(0);
 335                 glBindVertexArray(0);
 336
 337                 unsigned max_clip_planes = Limits::get_global().max_clip_planes;
 338                 for(unsigned i=0; i<max_clip_planes; ++i)
 339                         if((last_applied->enabled_clip_planes>>i)&1)
 340                                 glDisable(GL_CLIP_PLANE0+i);
 341
 342                 for(vector<BoundTexture>::const_iterator i=last_applied->textures.begin(); i!=last_applied->textures.end(); ++i)
 343                         if(i->texture && i->sampler)
 344                         {
 345                                 if(ARB_direct_state_access)
 346                                         glBindTextureUnit(i->binding, 0);
 347                                 else
 348                                 {
 349                                         glActiveTexture(GL_TEXTURE0+i->binding);
 350                                         glBindTexture(bound_tex_targets[i->binding], 0);
 351                                         bound_tex_targets[i->binding] = 0;
 352                                 }
 353                         }
 354
 355                 for(vector<BoundUniformBlock>::const_iterator i=last_applied->uniform_blocks.begin(); i!=last_applied->uniform_blocks.end(); ++i)
 356                         if(i->block)
 357                                 glBindBufferBase(GL_UNIFORM_BUFFER, i->binding, 0);
 358
 359                 glDisable(GL_DEPTH_TEST);
 360                 glDepthMask(true);
 361                 glDisable(GL_STENCIL_TEST);
 362                 glDisable(GL_BLEND);
 363
 364                 last_applied = 0;
 365         }
 366 }
 367
 368
 369 PipelineState::BoundTexture::BoundTexture(unsigned b):
 370         binding(b),
 371         changed(false),
 372         texture(0),
 373         sampler(0)
 374 { }
 375
 376
 377 PipelineState::BoundUniformBlock::BoundUniformBlock(int b):
 378         binding(b),
 379         changed(false),
 380         block(0)
 381 { }
 382
 383 } // namespace GL
 384 } // namespace Msp