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::SCISSOR|PipelineState::FRAMEBUFFER))
  70                 if(const Framebuffer *framebuffer = self.framebuffer)
  71                 {
  72                         Rect fb_rect = framebuffer->get_rect();
  73                         if(mask&(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(mask&(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(mask&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(mask&PipelineState::UNIFORMS)
 110         {
 111                 for(const PipelineState::BoundUniformBlock &u: self.uniform_blocks)
 112                         if(u.changed || mask==~0U)
 113                         {
 114                                 if(u.used)
 115                                 {
 116                                         if(u.binding>=0)
 117                                         {
 118                                                 glBindBufferRange(GL_UNIFORM_BUFFER, u.binding, u.buffer->id, u.block->get_offset(), u.block->get_data_size());
 119                                                 dev_state.bound_uniform_blocks[u.binding] = 1;
 120                                         }
 121                                         else if(u.binding==ReflectData::DEFAULT_BLOCK && self.shprog)
 122                                         {
 123                                                 const char *data = static_cast<const char *>(u.block->get_data_pointer());
 124                                                 for(const Program::UniformCall &call: self.shprog->uniform_calls)
 125                                                         call.func(call.location, call.size, data+call.location*16);
 126                                         }
 127                                 }
 128
 129                                 u.changed = false;
 130                         }
 131         }
 132
 133         if(mask&PipelineState::TEXTURES)
 134         {
 135                 for(const PipelineState::BoundTexture &t: self.textures)
 136                         if(t.changed || mask==~0U)
 137                         {
 138                                 if(t.used)
 139                                 {
 140                                         if(ARB_direct_state_access)
 141                                                 glBindTextureUnit(t.binding, t.texture->id);
 142                                         else
 143                                         {
 144                                                 glActiveTexture(GL_TEXTURE0+t.binding);
 145                                                 if(dev_state.bound_tex_targets[t.binding] && static_cast<int>(t.texture->target)!=dev_state.bound_tex_targets[t.binding])
 146                                                         glBindTexture(dev_state.bound_tex_targets[t.binding], 0);
 147                                                 glBindTexture(t.texture->target, t.texture->id);
 148                                         }
 149
 150                                         dev_state.bound_tex_targets[t.binding] = t.texture->target;
 151
 152                                         glBindSampler(t.binding, t.sampler->id);
 153                                         t.sampler->refresh();
 154                                 }
 155
 156                                 t.changed = false;
 157                         }
 158         }
 159
 160         if(mask&PipelineState::VERTEX_SETUP)
 161         {
 162                 const VertexSetup *vertex_setup = self.vertex_setup;
 163                 glBindVertexArray(vertex_setup ? vertex_setup->id : 0);
 164                 if(vertex_setup)
 165                 {
 166                         static Require _req(MSP_primitive_restart);
 167
 168                         vertex_setup->refresh();
 169                         unsigned ri = (vertex_setup->get_index_type()==UNSIGNED_INT ? 0xFFFFFFFF : 0xFFFF);
 170                         if(ri!=dev_state.restart_index)
 171                         {
 172                                 if(!dev_state.restart_index)
 173                                         glEnable(GL_PRIMITIVE_RESTART);
 174                                 glPrimitiveRestartIndex(ri);
 175                                 dev_state.restart_index = ri;
 176                         }
 177                 }
 178         }
 179
 180         if(mask&PipelineState::FACE_CULL)
 181         {
 182                 glFrontFace(self.front_face==CLOCKWISE ? GL_CW : GL_CCW);
 183
 184                 if(self.face_cull!=NO_CULL && self.front_face!=NON_MANIFOLD)
 185                 {
 186                         glEnable(GL_CULL_FACE);
 187                         glCullFace(self.face_cull==CULL_FRONT ? GL_FRONT : GL_BACK);
 188                 }
 189                 else
 190                         glDisable(GL_CULL_FACE);
 191         }
 192
 193         if(mask&PipelineState::DEPTH_TEST)
 194         {
 195                 const DepthTest &depth_test = self.depth_test;
 196                 if(depth_test.enabled)
 197                 {
 198                         glEnable(GL_DEPTH_TEST);
 199                         glDepthFunc(get_gl_predicate(depth_test.compare));
 200                 }
 201                 else
 202                         glDisable(GL_DEPTH_TEST);
 203
 204                 glDepthMask(depth_test.write);
 205         }
 206
 207         if(mask&PipelineState::STENCIL_TEST)
 208         {
 209                 const StencilTest &stencil_test = self.stencil_test;
 210                 if(stencil_test.enabled)
 211                 {
 212                         glEnable(GL_STENCIL_TEST);
 213                         glStencilFunc(get_gl_predicate(stencil_test.compare), stencil_test.reference, 0xFFFFFFFF);
 214                         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));
 215                 }
 216                 else
 217                         glDisable(GL_STENCIL_TEST);
 218         }
 219
 220         if(mask&PipelineState::BLEND)
 221         {
 222                 const Blend &blend = self.blend;
 223                 if(blend.enabled)
 224                 {
 225                         glEnable(GL_BLEND);
 226                         glBlendEquation(get_gl_blend_equation(blend.equation));
 227                         glBlendFunc(get_gl_blend_factor(blend.src_factor), get_gl_blend_factor(blend.dst_factor));
 228                         glBlendColor(blend.constant.r, blend.constant.g, blend.constant.b, blend.constant.a);
 229                         ColorWriteMask cw = blend.write_mask;
 230                         glColorMask((cw&WRITE_RED)!=0, (cw&WRITE_GREEN)!=0, (cw&WRITE_BLUE)!=0, (cw&WRITE_ALPHA)!=0);
 231                 }
 232                 else
 233                 {
 234                         glDisable(GL_BLEND);
 235                         glColorMask(true, true, true, true);
 236                 }
 237         }
 238
 239         applied_to = &device;
 240         dev_state.last_pipeline = this;
 241         changes = 0;
 242 }
 243
 244 void OpenGLPipelineState::clear()
 245 {
 246         OpenGLDeviceState &dev_state = Device::get_current().get_state();
 247         if(dev_state.last_pipeline)
 248         {
 249                 glUseProgram(0);
 250                 glBindVertexArray(0);
 251
 252                 for(unsigned i=0; i<dev_state.n_clip_distances; ++i)
 253                         glDisable(GL_CLIP_PLANE0+i);
 254                 dev_state.n_clip_distances = 0;
 255
 256                 for(unsigned i=0; i<dev_state.bound_tex_targets.size(); ++i)
 257                         if(dev_state.bound_tex_targets[i])
 258                         {
 259                                 if(ARB_direct_state_access)
 260                                         glBindTextureUnit(i, 0);
 261                                 else
 262                                 {
 263                                         glActiveTexture(GL_TEXTURE0+i);
 264                                         glBindTexture(dev_state.bound_tex_targets[i], 0);
 265                                 }
 266                                 dev_state.bound_tex_targets[i] = 0;
 267                         }
 268
 269                 for(unsigned i=0; i<dev_state.bound_uniform_blocks.size(); ++i)
 270                         if(dev_state.bound_uniform_blocks[i])
 271                         {
 272                                 glBindBufferBase(GL_UNIFORM_BUFFER, i, 0);
 273                                 dev_state.bound_uniform_blocks[i] = 0;
 274                         }
 275
 276                 glDisable(GL_DEPTH_TEST);
 277                 glDepthMask(true);
 278                 glDisable(GL_STENCIL_TEST);
 279                 glDisable(GL_BLEND);
 280
 281                 dev_state.last_pipeline->applied_to = 0;
 282                 dev_state.last_pipeline = 0;
 283         }
 284 }
 285
 286 } // namespace GL
 287 } // namespace Msp