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 "framebuffer.h"
  13 #include "pipelinestate.h"
  14 #include "program.h"
  15 #include "rect.h"
  16 #include "stenciltest.h"
  17 #include "texture.h"
  18 #include "uniformblock.h"
  19 #include "vertexsetup.h"
  20
  21 using namespace std;
  22
  23 namespace Msp {
  24 namespace GL {
  25
  26 const PipelineState *PipelineState::last_applied = 0;
  27 vector<int> PipelineState::bound_tex_targets;
  28
  29 PipelineState::PipelineState():
  30         framebuffer(0),
  31         viewport(0),
  32         scissor(0),
  33         shprog(0),
  34         vertex_setup(0),
  35         front_face(COUNTERCLOCKWISE),
  36         face_cull(NO_CULL),
  37         enabled_clip_planes(0),
  38         depth_test(0),
  39         stencil_test(0),
  40         blend(0),
  41         changes(0)
  42 {
  43         if(!ARB_direct_state_access && bound_tex_targets.empty())
  44                 bound_tex_targets.resize(Limits::get_global().max_texture_bindings);
  45 }
  46
  47 PipelineState::~PipelineState()
  48 {
  49         if(this==last_applied)
  50                 last_applied = 0;
  51 }
  52
  53 template<typename T>
  54 void PipelineState::set(T &target, T value, unsigned flag)
  55 {
  56         if(value!=target)
  57         {
  58                 target = value;
  59                 changes |= flag;
  60         }
  61 }
  62
  63 void PipelineState::set_framebuffer(const Framebuffer *f)
  64 {
  65         set(framebuffer, f, FRAMEBUFFER|VIEWPORT);
  66 }
  67
  68 void PipelineState::set_viewport(const Rect *v)
  69 {
  70         set(viewport, v, VIEWPORT);
  71 }
  72
  73 void PipelineState::set_scissor(const Rect *s)
  74 {
  75         set(scissor, s, SCISSOR);
  76 }
  77
  78 void PipelineState::set_shader_program(const Program *p)
  79 {
  80         set(shprog, p, SHPROG);
  81 }
  82
  83 void PipelineState::set_vertex_setup(const VertexSetup *s)
  84 {
  85         set(vertex_setup, s, VERTEX_SETUP);
  86 }
  87
  88 void PipelineState::set_front_face(FaceWinding w)
  89 {
  90         set(front_face, w, FACE_CULL);
  91 }
  92
  93 void PipelineState::set_face_cull(CullMode c)
  94 {
  95         set(face_cull, c, FACE_CULL);
  96 }
  97
  98 void PipelineState::set_enabled_clip_planes(unsigned p)
  99 {
 100         set(enabled_clip_planes, p, CLIP_PLANES);
 101 }
 102
 103 void PipelineState::set_texture(unsigned binding, const Texture *tex, const Sampler *samp)
 104 {
 105         if((tex!=0)!=(samp!=0))
 106                 throw invalid_argument("PipelineState::set_texture");
 107
 108         vector<BoundTexture>::iterator i = lower_bound_member(textures, binding, &BoundTexture::binding);
 109         if(i==textures.end() || i->binding!=binding)
 110                 i = textures.insert(i, BoundTexture(binding));
 111         if(tex!=i->texture || samp!=i->sampler)
 112         {
 113                 i->texture = tex;
 114                 i->sampler = samp;
 115                 i->changed = true;
 116                 changes |= TEXTURES;
 117         }
 118 }
 119
 120 void PipelineState::set_uniforms(const DefaultUniformBlock *block)
 121 {
 122         set_uniform_block_(-1, block);
 123 }
 124
 125 void PipelineState::set_uniform_block(unsigned binding, const BufferBackedUniformBlock *block)
 126 {
 127         set_uniform_block_(binding, block);
 128 }
 129
 130 void PipelineState::set_uniform_block_(int binding, const UniformBlock *block)
 131 {
 132         vector<BoundUniformBlock>::iterator i = lower_bound_member(uniform_blocks, binding, &BoundUniformBlock::binding);
 133         if(i==uniform_blocks.end() || i->binding!=binding)
 134                 i = uniform_blocks.insert(i, BoundUniformBlock(binding));
 135         if(block!=i->block || binding<0)
 136         {
 137                 i->block = block;
 138                 i->changed = true;
 139                 changes |= UNIFORMS;
 140         }
 141 }
 142
 143 void PipelineState::set_depth_test(const DepthTest *dt)
 144 {
 145         set(depth_test, dt, DEPTH_TEST);
 146 }
 147
 148 void PipelineState::set_stencil_test(const StencilTest *st)
 149 {
 150         set(stencil_test, st, STENCIL_TEST);
 151 }
 152
 153 void PipelineState::set_blend(const Blend *b)
 154 {
 155         set(blend, b, BLEND);
 156 }
 157
 158 void PipelineState::apply() const
 159 {
 160         apply(this==last_applied ? changes : ~0U);
 161 }
 162
 163 void PipelineState::apply(unsigned mask) const
 164 {
 165         if(mask&FRAMEBUFFER)
 166         {
 167                 glBindFramebuffer(GL_FRAMEBUFFER, framebuffer ? framebuffer->get_id() : 0);
 168                 if(framebuffer)
 169                 {
 170                         framebuffer->refresh();
 171                         framebuffer->require_complete();
 172                 }
 173         }
 174
 175         if(mask&VIEWPORT)
 176         {
 177                 if(viewport)
 178                         glViewport(viewport->left, viewport->bottom, viewport->width, viewport->height);
 179                 else if(framebuffer)
 180                         glViewport(0, 0, framebuffer->get_width(), framebuffer->get_height());
 181         }
 182
 183         if(mask&SCISSOR)
 184         {
 185                 if(scissor)
 186                 {
 187                         glEnable(GL_SCISSOR_TEST);
 188                         glScissor(scissor->left, scissor->bottom, scissor->width, scissor->height);
 189                 }
 190                 else
 191                         glDisable(GL_SCISSOR_TEST);
 192         }
 193
 194         if(mask&SHPROG)
 195                 glUseProgram(shprog ? shprog->get_id() : 0);
 196
 197         if(mask&VERTEX_SETUP)
 198         {
 199                 glBindVertexArray(vertex_setup ? vertex_setup->get_id() : 0);
 200                 if(vertex_setup)
 201                         vertex_setup->refresh();
 202         }
 203
 204         if(mask&FACE_CULL)
 205         {
 206                 glFrontFace(front_face==CLOCKWISE ? GL_CW : GL_CCW);
 207
 208                 if(face_cull!=NO_CULL && front_face!=NON_MANIFOLD)
 209                 {
 210                         glEnable(GL_CULL_FACE);
 211                         glCullFace(face_cull==CULL_FRONT ? GL_FRONT : GL_BACK);
 212                 }
 213                 else
 214                         glDisable(GL_CULL_FACE);
 215         }
 216
 217         if(mask&CLIP_PLANES)
 218         {
 219                 unsigned max_clip_planes = Limits::get_global().max_clip_planes;
 220                 for(unsigned i=0; i<max_clip_planes; ++i)
 221                 {
 222                         if((enabled_clip_planes>>i)&1)
 223                                 glEnable(GL_CLIP_PLANE0+i);
 224                         else
 225                                 glDisable(GL_CLIP_PLANE0+i);
 226                 }
 227         }
 228
 229         if(mask&TEXTURES)
 230         {
 231                 if(last_applied && this!=last_applied)
 232                 {
 233                         vector<BoundTexture>::const_iterator i = textures.begin();
 234                         vector<BoundTexture>::const_iterator j = last_applied->textures.begin();
 235                         while(j!=last_applied->textures.end())
 236                         {
 237                                 if(i==textures.end() || j->binding<i->binding)
 238                                 {
 239                                         if(bound_tex_targets[j->binding])
 240                                         {
 241                                                 if(ARB_direct_state_access)
 242                                                         glBindTextureUnit(j->binding, 0);
 243                                                 else
 244                                                 {
 245                                                         glActiveTexture(GL_TEXTURE0+j->binding);
 246                                                         glBindTexture(bound_tex_targets[j->binding], 0);
 247                                                 }
 248                                         }
 249                                         ++j;
 250                                 }
 251                                 else
 252                                 {
 253                                         if(i->binding==j->binding)
 254                                                 ++j;
 255                                         ++i;
 256                                 }
 257                         }
 258                 }
 259
 260                 for(vector<BoundTexture>::const_iterator i=textures.begin(); i!=textures.end(); ++i)
 261                         if(i->changed || mask==~0U)
 262                         {
 263                                 if(i->texture && i->sampler)
 264                                 {
 265                                         if(ARB_direct_state_access)
 266                                                 glBindTextureUnit(i->binding, i->texture->get_id());
 267                                         else
 268                                         {
 269                                                 glActiveTexture(GL_TEXTURE0+i->binding);
 270                                                 if(bound_tex_targets[i->binding] && static_cast<int>(i->texture->get_target())!=bound_tex_targets[i->binding])
 271                                                         glBindTexture(bound_tex_targets[i->binding], 0);
 272                                                 glBindTexture(i->texture->get_target(), i->texture->get_id());
 273                                                 bound_tex_targets[i->binding] = i->texture->get_target();
 274                                         }
 275
 276                                         glBindSampler(i->binding, i->sampler->get_id());
 277                                         i->sampler->refresh();
 278                                 }
 279                                 else if(bound_tex_targets[i->binding])
 280                                 {
 281                                         if(ARB_direct_state_access)
 282                                                 glBindTextureUnit(i->binding, 0);
 283                                         else
 284                                         {
 285                                                 glActiveTexture(GL_TEXTURE0+i->binding);
 286                                                 glBindTexture(bound_tex_targets[i->binding], 0);
 287                                                 bound_tex_targets[i->binding] = 0;
 288                                         }
 289                                 }
 290
 291                                 i->changed = false;
 292                         }
 293         }
 294
 295         if(mask&UNIFORMS)
 296         {
 297                 if(last_applied && this!=last_applied)
 298                 {
 299                         vector<BoundUniformBlock>::const_iterator i = uniform_blocks.begin();
 300                         vector<BoundUniformBlock>::const_iterator j = last_applied->uniform_blocks.begin();
 301                         while(j!=last_applied->uniform_blocks.end())
 302                         {
 303                                 if(i==uniform_blocks.end() || j->binding<i->binding)
 304                                 {
 305                                         glBindBufferBase(GL_UNIFORM_BUFFER, j->binding, 0);
 306                                         ++j;
 307                                 }
 308                                 else
 309                                 {
 310                                         if(i->binding==j->binding)
 311                                                 ++j;
 312                                         ++i;
 313                                 }
 314                         }
 315                 }
 316
 317                 for(vector<BoundUniformBlock>::const_iterator i=uniform_blocks.begin(); i!=uniform_blocks.end(); ++i)
 318                         if(i->changed || mask==~0U)
 319                         {
 320                                 if(i->block)
 321                                 {
 322                                         if(i->binding>=0)
 323                                         {
 324                                                 const BufferBackedUniformBlock *block = static_cast<const BufferBackedUniformBlock *>(i->block);
 325                                                 glBindBufferRange(GL_UNIFORM_BUFFER, i->binding, block->get_buffer()->get_id(), block->get_offset(), block->get_data_size());
 326                                         }
 327                                         else
 328                                                 static_cast<const DefaultUniformBlock *>(i->block)->apply();
 329                                 }
 330                                 else
 331                                         glBindBufferBase(GL_UNIFORM_BUFFER, i->binding, 0);
 332
 333                                 i->changed = false;
 334                         }
 335         }
 336
 337         if(mask&DEPTH_TEST)
 338         {
 339                 if(depth_test && depth_test->enabled)
 340                 {
 341                         glEnable(GL_DEPTH_TEST);
 342                         glDepthFunc(get_gl_predicate(depth_test->compare));
 343                 }
 344                 else
 345                         glDisable(GL_DEPTH_TEST);
 346
 347                 glDepthMask(!depth_test || depth_test->write);
 348         }
 349
 350         if(mask&STENCIL_TEST)
 351         {
 352                 if(stencil_test && stencil_test->enabled)
 353                 {
 354                         glEnable(GL_STENCIL_TEST);
 355                         glStencilFunc(get_gl_predicate(stencil_test->compare), stencil_test->reference, 0xFFFFFFFF);
 356                         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));
 357                 }
 358                 else
 359                         glDisable(GL_STENCIL_TEST);
 360         }
 361
 362         if(mask&BLEND)
 363         {
 364                 if(blend && blend->enabled)
 365                 {
 366                         glEnable(GL_BLEND);
 367                         glBlendEquation(get_gl_blend_equation(blend->equation));
 368                         glBlendFunc(get_gl_blend_factor(blend->src_factor), get_gl_blend_factor(blend->dst_factor));
 369                         glBlendColor(blend->constant.r, blend->constant.g, blend->constant.b, blend->constant.a);
 370                 }
 371                 else
 372                         glDisable(GL_BLEND);
 373         }
 374
 375         last_applied = this;
 376         changes &= ~mask;
 377 }
 378
 379 void PipelineState::clear()
 380 {
 381         if(last_applied)
 382         {
 383                 glUseProgram(0);
 384                 glBindVertexArray(0);
 385
 386                 unsigned max_clip_planes = Limits::get_global().max_clip_planes;
 387                 for(unsigned i=0; i<max_clip_planes; ++i)
 388                         if((last_applied->enabled_clip_planes>>i)&1)
 389                                 glDisable(GL_CLIP_PLANE0+i);
 390
 391                 for(vector<BoundTexture>::const_iterator i=last_applied->textures.begin(); i!=last_applied->textures.end(); ++i)
 392                         if(i->texture && i->sampler)
 393                         {
 394                                 if(ARB_direct_state_access)
 395                                         glBindTextureUnit(i->binding, 0);
 396                                 else
 397                                 {
 398                                         glActiveTexture(GL_TEXTURE0+i->binding);
 399                                         glBindTexture(bound_tex_targets[i->binding], 0);
 400                                         bound_tex_targets[i->binding] = 0;
 401                                 }
 402                         }
 403
 404                 for(vector<BoundUniformBlock>::const_iterator i=last_applied->uniform_blocks.begin(); i!=last_applied->uniform_blocks.end(); ++i)
 405                         if(i->block)
 406                                 glBindBufferBase(GL_UNIFORM_BUFFER, i->binding, 0);
 407
 408                 glDisable(GL_DEPTH_TEST);
 409                 glDepthMask(true);
 410                 glDisable(GL_STENCIL_TEST);
 411                 glDisable(GL_BLEND);
 412
 413                 last_applied = 0;
 414         }
 415 }
 416
 417
 418 PipelineState::BoundTexture::BoundTexture(unsigned b):
 419         binding(b),
 420         changed(false),
 421         texture(0),
 422         sampler(0)
 423 { }
 424
 425
 426 PipelineState::BoundUniformBlock::BoundUniformBlock(int b):
 427         binding(b),
 428         changed(false),
 429         block(0)
 430 { }
 431
 432 } // namespace GL
 433 } // namespace Msp