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