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