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         unsigned mask = changes;
  40
  41         if(applied_to && applied_to!=&device)
  42         {
  43                 applied_to->get_state().last_pipeline = 0;
  44                 mask = ~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                 mask = ~0U;
  56         }
  57
  58         if(mask&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(mask&(PipelineState::VIEWPORT|PipelineState::FRAMEBUFFER))
  70         {
  71                 if(const Rect *viewport = self.viewport)
  72                         glViewport(viewport->left, viewport->bottom, viewport->width, viewport->height);
  73                 else if(const Framebuffer *framebuffer = self.framebuffer)
  74                         glViewport(0, 0, framebuffer->get_width(), framebuffer->get_height());
  75         }
  76
  77         if(mask&PipelineState::SCISSOR)
  78         {
  79                 if(const Rect *scissor = self.scissor)
  80                 {
  81                         glEnable(GL_SCISSOR_TEST);
  82                         glScissor(scissor->left, scissor->bottom, scissor->width, scissor->height);
  83                 }
  84                 else
  85                         glDisable(GL_SCISSOR_TEST);
  86         }
  87
  88         if(mask&PipelineState::SHPROG)
  89         {
  90                 glUseProgram(self.shprog ? self.shprog->id : 0);
  91
  92                 unsigned ncd = (self.shprog ? self.shprog->get_n_clip_distances() : 0);
  93                 if(ncd!=dev_state.n_clip_distances)
  94                 {
  95                         for(unsigned i=0; (i<ncd || i<dev_state.n_clip_distances); ++i)
  96                         {
  97                                 if(i<ncd)
  98                                         glEnable(GL_CLIP_PLANE0+i);
  99                                 else
 100                                         glDisable(GL_CLIP_PLANE0+i);
 101                         }
 102                         dev_state.n_clip_distances = ncd;
 103                 }
 104         }
 105
 106         if(mask&PipelineState::UNIFORMS)
 107         {
 108                 for(const PipelineState::BoundUniformBlock &u: self.uniform_blocks)
 109                         if(u.changed || mask==~0U)
 110                         {
 111                                 if(u.used)
 112                                 {
 113                                         if(u.binding>=0)
 114                                         {
 115                                                 glBindBufferRange(GL_UNIFORM_BUFFER, u.binding, u.buffer->id, u.block->get_offset(), u.block->get_data_size());
 116                                                 dev_state.bound_uniform_blocks[u.binding] = 1;
 117                                         }
 118                                         else if(u.binding==ReflectData::DEFAULT_BLOCK && self.shprog)
 119                                         {
 120                                                 const char *data = static_cast<const char *>(u.block->get_data_pointer());
 121                                                 for(const Program::UniformCall &call: self.shprog->uniform_calls)
 122                                                         call.func(call.location, call.size, data+call.location*16);
 123                                         }
 124                                 }
 125
 126                                 u.changed = false;
 127                         }
 128         }
 129
 130         if(mask&PipelineState::TEXTURES)
 131         {
 132                 for(const PipelineState::BoundTexture &t: self.textures)
 133                         if(t.changed || mask==~0U)
 134                         {
 135                                 if(t.used)
 136                                 {
 137                                         if(ARB_direct_state_access)
 138                                                 glBindTextureUnit(t.binding, t.texture->id);
 139                                         else
 140                                         {
 141                                                 glActiveTexture(GL_TEXTURE0+t.binding);
 142                                                 if(dev_state.bound_tex_targets[t.binding] && static_cast<int>(t.texture->target)!=dev_state.bound_tex_targets[t.binding])
 143                                                         glBindTexture(dev_state.bound_tex_targets[t.binding], 0);
 144                                                 glBindTexture(t.texture->target, t.texture->id);
 145                                         }
 146
 147                                         dev_state.bound_tex_targets[t.binding] = t.texture->target;
 148
 149                                         glBindSampler(t.binding, t.sampler->id);
 150                                         t.sampler->refresh();
 151                                 }
 152
 153                                 t.changed = false;
 154                         }
 155         }
 156
 157         if(mask&PipelineState::VERTEX_SETUP)
 158         {
 159                 const VertexSetup *vertex_setup = self.vertex_setup;
 160                 glBindVertexArray(vertex_setup ? vertex_setup->id : 0);
 161                 if(vertex_setup)
 162                 {
 163                         static Require _req(MSP_primitive_restart);
 164
 165                         vertex_setup->refresh();
 166                         unsigned ri = (vertex_setup->get_index_type()==UNSIGNED_INT ? 0xFFFFFFFF : 0xFFFF);
 167                         if(ri!=dev_state.restart_index)
 168                         {
 169                                 if(!dev_state.restart_index)
 170                                         glEnable(GL_PRIMITIVE_RESTART);
 171                                 glPrimitiveRestartIndex(ri);
 172                                 dev_state.restart_index = ri;
 173                         }
 174                 }
 175         }
 176
 177         if(mask&PipelineState::FACE_CULL)
 178         {
 179                 glFrontFace(self.front_face==CLOCKWISE ? GL_CW : GL_CCW);
 180
 181                 if(self.face_cull!=NO_CULL && self.front_face!=NON_MANIFOLD)
 182                 {
 183                         glEnable(GL_CULL_FACE);
 184                         glCullFace(self.face_cull==CULL_FRONT ? GL_FRONT : GL_BACK);
 185                 }
 186                 else
 187                         glDisable(GL_CULL_FACE);
 188         }
 189
 190         if(mask&PipelineState::DEPTH_TEST)
 191         {
 192                 const DepthTest *depth_test = self.depth_test;
 193                 if(depth_test && depth_test->enabled)
 194                 {
 195                         glEnable(GL_DEPTH_TEST);
 196                         glDepthFunc(get_gl_predicate(depth_test->compare));
 197                 }
 198                 else
 199                         glDisable(GL_DEPTH_TEST);
 200
 201                 glDepthMask(!depth_test || depth_test->write);
 202         }
 203
 204         if(mask&PipelineState::STENCIL_TEST)
 205         {
 206                 const StencilTest *stencil_test = self.stencil_test;
 207                 if(stencil_test && stencil_test->enabled)
 208                 {
 209                         glEnable(GL_STENCIL_TEST);
 210                         glStencilFunc(get_gl_predicate(stencil_test->compare), stencil_test->reference, 0xFFFFFFFF);
 211                         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));
 212                 }
 213                 else
 214                         glDisable(GL_STENCIL_TEST);
 215         }
 216
 217         if(mask&PipelineState::BLEND)
 218         {
 219                 const Blend *blend = self.blend;
 220                 if(blend && blend->enabled)
 221                 {
 222                         glEnable(GL_BLEND);
 223                         glBlendEquation(get_gl_blend_equation(blend->equation));
 224                         glBlendFunc(get_gl_blend_factor(blend->src_factor), get_gl_blend_factor(blend->dst_factor));
 225                         glBlendColor(blend->constant.r, blend->constant.g, blend->constant.b, blend->constant.a);
 226                         ColorWriteMask cw = blend->write_mask;
 227                         glColorMask((cw&WRITE_RED)!=0, (cw&WRITE_GREEN)!=0, (cw&WRITE_BLUE)!=0, (cw&WRITE_ALPHA)!=0);
 228                 }
 229                 else
 230                 {
 231                         glDisable(GL_BLEND);
 232                         glColorMask(true, true, true, true);
 233                 }
 234         }
 235
 236         applied_to = &device;
 237         dev_state.last_pipeline = this;
 238         changes = 0;
 239 }
 240
 241 void OpenGLPipelineState::clear()
 242 {
 243         OpenGLDeviceState &dev_state = Device::get_current().get_state();
 244         if(dev_state.last_pipeline)
 245         {
 246                 glUseProgram(0);
 247                 glBindVertexArray(0);
 248
 249                 for(unsigned i=0; i<dev_state.n_clip_distances; ++i)
 250                         glDisable(GL_CLIP_PLANE0+i);
 251                 dev_state.n_clip_distances = 0;
 252
 253                 for(unsigned i=0; i<dev_state.bound_tex_targets.size(); ++i)
 254                         if(dev_state.bound_tex_targets[i])
 255                         {
 256                                 if(ARB_direct_state_access)
 257                                         glBindTextureUnit(i, 0);
 258                                 else
 259                                 {
 260                                         glActiveTexture(GL_TEXTURE0+i);
 261                                         glBindTexture(dev_state.bound_tex_targets[i], 0);
 262                                 }
 263                                 dev_state.bound_tex_targets[i] = 0;
 264                         }
 265
 266                 for(unsigned i=0; i<dev_state.bound_uniform_blocks.size(); ++i)
 267                         if(dev_state.bound_uniform_blocks[i])
 268                         {
 269                                 glBindBufferBase(GL_UNIFORM_BUFFER, i, 0);
 270                                 dev_state.bound_uniform_blocks[i] = 0;
 271                         }
 272
 273                 glDisable(GL_DEPTH_TEST);
 274                 glDepthMask(true);
 275                 glDisable(GL_STENCIL_TEST);
 276                 glDisable(GL_BLEND);
 277
 278                 dev_state.last_pipeline->applied_to = 0;
 279                 dev_state.last_pipeline = 0;
 280         }
 281 }
 282
 283 } // namespace GL
 284 } // namespace Msp