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