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