source/backends/opengl/pipelinestate_backend.cpp

   1 #include <msp/gl/extensions/arb_direct_state_access.h>
   2 #include <msp/gl/extensions/arb_sampler_objects.h>
   3 #include <msp/gl/extensions/arb_shader_image_load_store.h>
   4 #include <msp/gl/extensions/arb_shader_objects.h>
   5 #include <msp/gl/extensions/arb_uniform_buffer_object.h>
   6 #include <msp/gl/extensions/arb_vertex_array_object.h>
   7 #include <msp/gl/extensions/arb_tessellation_shader.h>
   8 #include <msp/gl/extensions/ext_framebuffer_object.h>
   9 #include <msp/gl/extensions/msp_primitive_restart.h>
  10 #include "blend.h"
  11 #include "buffer.h"
  12 #include "depthtest.h"
  13 #include "device.h"
  14 #include "framebuffer.h"
  15 #include "gl.h"
  16 #include "pipelinestate.h"
  17 #include "pipelinestate_backend.h"
  18 #include "program.h"
  19 #include "rect.h"
  20 #include "sampler.h"
  21 #include "stenciltest.h"
  22 #include "texture.h"
  23 #include "uniformblock.h"
  24 #include "vertexsetup.h"
  25
  26 using namespace std;
  27
  28 namespace Msp {
  29 namespace GL {
  30
  31 OpenGLPipelineState::~OpenGLPipelineState()
  32 {
  33         if(applied_to)
  34                 applied_to->get_state().last_pipeline = 0;
  35 }
  36
  37 void OpenGLPipelineState::apply() const
  38 {
  39         const PipelineState &self = *static_cast<const PipelineState *>(this);
  40         Device &device = Device::get_current();
  41
  42         if(applied_to && applied_to!=&device)
  43         {
  44                 applied_to->get_state().last_pipeline = 0;
  45                 changes = ~0U;
  46         }
  47
  48         OpenGLDeviceState &dev_state = device.get_state();
  49         if(!dev_state.last_pipeline)
  50                 OpenGLTexture::unbind_scratch();
  51
  52         if(this!=dev_state.last_pipeline)
  53         {
  54                 if(dev_state.last_pipeline)
  55                         dev_state.last_pipeline->applied_to = 0;
  56                 changes = ~0U;
  57         }
  58
  59         if(changes&PipelineState::FRAMEBUFFER)
  60         {
  61                 const Framebuffer *framebuffer = self.framebuffer;
  62                 glBindFramebuffer(GL_FRAMEBUFFER, framebuffer ? framebuffer->id : 0);
  63                 if(framebuffer)
  64                 {
  65                         framebuffer->refresh();
  66                         framebuffer->require_complete();
  67                 }
  68         }
  69
  70         if(changes&(PipelineState::VIEWPORT|PipelineState::SCISSOR|PipelineState::FRAMEBUFFER))
  71                 if(const Framebuffer *framebuffer = self.framebuffer)
  72                 {
  73                         Rect fb_rect = framebuffer->get_rect();
  74                         if(changes&(PipelineState::VIEWPORT|PipelineState::FRAMEBUFFER))
  75                         {
  76                                 Rect viewport = fb_rect.intersect(self.viewport);
  77                                 glViewport(viewport.left, viewport.bottom, viewport.width, viewport.height);
  78                         }
  79                         if(changes&(PipelineState::SCISSOR|PipelineState::FRAMEBUFFER))
  80                         {
  81                                 Rect scissor = fb_rect.intersect(self.scissor);
  82                                 if(scissor!=fb_rect)
  83                                 {
  84                                         glEnable(GL_SCISSOR_TEST);
  85                                         glScissor(scissor.left, scissor.bottom, scissor.width, scissor.height);
  86                                 }
  87                                 else
  88                                         glDisable(GL_SCISSOR_TEST);
  89                         }
  90                 }
  91
  92         if(changes&PipelineState::SHPROG)
  93         {
  94                 glUseProgram(self.shprog ? self.shprog->id : 0);
  95
  96                 unsigned ncd = (self.shprog ? self.shprog->get_n_clip_distances() : 0);
  97                 if(ncd!=dev_state.n_clip_distances)
  98                 {
  99                         for(unsigned i=0; (i<ncd || i<dev_state.n_clip_distances); ++i)
 100                         {
 101                                 if(i<ncd)
 102                                         glEnable(GL_CLIP_PLANE0+i);
 103                                 else
 104                                         glDisable(GL_CLIP_PLANE0+i);
 105                         }
 106                         dev_state.n_clip_distances = ncd;
 107                 }
 108         }
 109
 110         if(changes&PipelineState::RESOURCES)
 111         {
 112                 for(const PipelineState::BoundResource &r: self.resources)
 113                 {
 114                         if(!r.changed && changes!=~0U)
 115                                 continue;
 116
 117                         if(r.used)
 118                         {
 119                                 if(r.type==PipelineState::UNIFORM_BLOCK)
 120                                 {
 121                                         if(r.binding>=0)
 122                                         {
 123                                                 glBindBufferRange(GL_UNIFORM_BUFFER, r.binding, r.buffer->id, r.block->get_offset(), r.block->get_data_size());
 124                                                 dev_state.bound_uniform_blocks[r.binding] = 1;
 125                                         }
 126                                         else if(r.binding==ReflectData::DEFAULT_BLOCK && self.shprog)
 127                                         {
 128                                                 const char *data = static_cast<const char *>(r.block->get_data_pointer());
 129                                                 for(const Program::UniformCall &call: self.shprog->uniform_calls)
 130                                                         call.func(call.location, call.size, data+call.location*16);
 131                                         }
 132                                 }
 133                                 else if(r.type==PipelineState::SAMPLED_TEXTURE)
 134                                 {
 135                                         if(ARB_direct_state_access)
 136                                                 glBindTextureUnit(r.binding, r.texture->id);
 137                                         else
 138                                         {
 139                                                 glActiveTexture(GL_TEXTURE0+r.binding);
 140                                                 if(dev_state.bound_tex_targets[r.binding] && static_cast<int>(r.texture->target)!=dev_state.bound_tex_targets[r.binding])
 141                                                         glBindTexture(dev_state.bound_tex_targets[r.binding], 0);
 142                                                 glBindTexture(r.texture->target, r.texture->id);
 143                                         }
 144
 145                                         dev_state.bound_tex_targets[r.binding] = r.texture->target;
 146
 147                                         glBindSampler(r.binding, r.sampler->id);
 148                                         r.sampler->refresh();
 149                                 }
 150                                 else if(r.type==PipelineState::STORAGE_TEXTURE)
 151                                 {
 152                                         static Require _req(ARB_shader_image_load_store);
 153                                         GLenum gl_format = get_gl_pixelformat(r.texture->get_format());
 154                                         glBindImageTexture(r.binding, r.texture->id, 0, true, 0, GL_READ_WRITE, gl_format);
 155
 156                                         dev_state.bound_storage_textures[r.binding] = 1;
 157                                 }
 158                         }
 159
 160                         r.changed = false;
 161                 }
 162         }
 163
 164         if(changes&PipelineState::VERTEX_SETUP)
 165         {
 166                 const VertexSetup *vertex_setup = self.vertex_setup;
 167                 glBindVertexArray(vertex_setup ? vertex_setup->id : 0);
 168                 if(vertex_setup)
 169                 {
 170                         static Require _req(MSP_primitive_restart);
 171
 172                         vertex_setup->refresh();
 173                         unsigned ri = (vertex_setup->get_index_type()==UNSIGNED_INT ? 0xFFFFFFFF : 0xFFFF);
 174                         if(ri!=dev_state.restart_index)
 175                         {
 176                                 if(!dev_state.restart_index)
 177                                         glEnable(GL_PRIMITIVE_RESTART);
 178                                 glPrimitiveRestartIndex(ri);
 179                                 dev_state.restart_index = ri;
 180                         }
 181                 }
 182         }
 183
 184         if(changes&PipelineState::PATCH_SIZE)
 185                 if(self.patch_size)
 186                 {
 187                         static Require _req(ARB_tessellation_shader);
 188                         glPatchParameteri(GL_PATCH_VERTICES, self.patch_size);
 189                 }
 190
 191         if(changes&PipelineState::FACE_CULL)
 192         {
 193                 glFrontFace(self.front_face==CLOCKWISE ? GL_CW : GL_CCW);
 194
 195                 if(self.face_cull!=NO_CULL && self.front_face!=NON_MANIFOLD)
 196                 {
 197                         glEnable(GL_CULL_FACE);
 198                         glCullFace(self.face_cull==CULL_FRONT ? GL_FRONT : GL_BACK);
 199                 }
 200                 else
 201                         glDisable(GL_CULL_FACE);
 202         }
 203
 204         if(changes&PipelineState::DEPTH_TEST)
 205         {
 206                 const DepthTest &depth_test = self.depth_test;
 207                 if(depth_test.enabled)
 208                 {
 209                         glEnable(GL_DEPTH_TEST);
 210                         glDepthFunc(get_gl_predicate(depth_test.compare));
 211                 }
 212                 else
 213                         glDisable(GL_DEPTH_TEST);
 214
 215                 glDepthMask(depth_test.write);
 216         }
 217
 218         if(changes&PipelineState::STENCIL_TEST)
 219         {
 220                 const StencilTest &stencil_test = self.stencil_test;
 221                 if(stencil_test.enabled)
 222                 {
 223                         glEnable(GL_STENCIL_TEST);
 224                         glStencilFunc(get_gl_predicate(stencil_test.compare), stencil_test.reference, 0xFFFFFFFF);
 225                         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));
 226                 }
 227                 else
 228                         glDisable(GL_STENCIL_TEST);
 229         }
 230
 231         if(changes&PipelineState::BLEND)
 232         {
 233                 const Blend &blend = self.blend;
 234                 if(blend.enabled)
 235                 {
 236                         glEnable(GL_BLEND);
 237                         glBlendEquation(get_gl_blend_equation(blend.equation));
 238                         glBlendFunc(get_gl_blend_factor(blend.src_factor), get_gl_blend_factor(blend.dst_factor));
 239                         glBlendColor(blend.constant.r, blend.constant.g, blend.constant.b, blend.constant.a);
 240                         ColorWriteMask cw = blend.write_mask;
 241                         glColorMask((cw&WRITE_RED)!=0, (cw&WRITE_GREEN)!=0, (cw&WRITE_BLUE)!=0, (cw&WRITE_ALPHA)!=0);
 242                 }
 243                 else
 244                 {
 245                         glDisable(GL_BLEND);
 246                         glColorMask(true, true, true, true);
 247                 }
 248
 249                 if(blend.alpha_to_coverage && self.framebuffer && self.framebuffer->get_format().get_samples()>1)
 250                         glEnable(GL_SAMPLE_ALPHA_TO_COVERAGE);
 251                 else
 252                         glDisable(GL_SAMPLE_ALPHA_TO_COVERAGE);
 253         }
 254
 255 #ifdef DEBUG
 256         if(changes&(PipelineState::SHPROG|PipelineState::RESOURCES))
 257                 self.check_bound_resources();
 258 #endif
 259
 260         applied_to = &device;
 261         dev_state.last_pipeline = this;
 262         changes = 0;
 263 }
 264
 265 void OpenGLPipelineState::clear()
 266 {
 267         OpenGLDeviceState &dev_state = Device::get_current().get_state();
 268         if(dev_state.last_pipeline)
 269         {
 270                 glUseProgram(0);
 271                 glBindVertexArray(0);
 272
 273                 for(unsigned i=0; i<dev_state.n_clip_distances; ++i)
 274                         glDisable(GL_CLIP_PLANE0+i);
 275                 dev_state.n_clip_distances = 0;
 276
 277                 for(unsigned i=0; i<dev_state.bound_tex_targets.size(); ++i)
 278                         if(dev_state.bound_tex_targets[i])
 279                         {
 280                                 if(ARB_direct_state_access)
 281                                         glBindTextureUnit(i, 0);
 282                                 else
 283                                 {
 284                                         glActiveTexture(GL_TEXTURE0+i);
 285                                         glBindTexture(dev_state.bound_tex_targets[i], 0);
 286                                 }
 287                                 dev_state.bound_tex_targets[i] = 0;
 288                         }
 289
 290                 for(unsigned i=0; i<dev_state.bound_storage_textures.size(); ++i)
 291                         if(dev_state.bound_storage_textures[i])
 292                         {
 293                                 glBindImageTexture(i, 0, 0, true, 0, GL_READ_ONLY, GL_RGBA8);
 294                                 dev_state.bound_storage_textures[i] = 0;
 295                         }
 296
 297                 for(unsigned i=0; i<dev_state.bound_uniform_blocks.size(); ++i)
 298                         if(dev_state.bound_uniform_blocks[i])
 299                         {
 300                                 glBindBufferBase(GL_UNIFORM_BUFFER, i, 0);
 301                                 dev_state.bound_uniform_blocks[i] = 0;
 302                         }
 303
 304                 glDisable(GL_DEPTH_TEST);
 305                 glDepthMask(true);
 306                 glDisable(GL_STENCIL_TEST);
 307                 glDisable(GL_BLEND);
 308
 309                 dev_state.last_pipeline->applied_to = 0;
 310                 dev_state.last_pipeline = 0;
 311         }
 312 }
 313
 314 } // namespace GL
 315 } // namespace Msp