source/backends/opengl/commands_backend.cpp

   1 #include <algorithm>
   2 #include <msp/gl/extensions/arb_direct_state_access.h>
   3 #include <msp/gl/extensions/arb_draw_instanced.h>
   4 #include <msp/gl/extensions/arb_occlusion_query.h>
   5 #include <msp/gl/extensions/ext_framebuffer_blit.h>
   6 #include <msp/gl/extensions/ext_framebuffer_object.h>
   7 #include <msp/gl/extensions/msp_clear_buffer.h>
   8 #include "batch.h"
   9 #include "commands_backend.h"
  10 #include "error.h"
  11 #include "framebuffer.h"
  12 #include "gl.h"
  13 #include "pipelinestate.h"
  14 #include "query.h"
  15
  16 using namespace std;
  17
  18 namespace Msp {
  19 namespace GL {
  20
  21 OpenGLCommands::OpenGLCommands():
  22         pipeline_state(0)
  23 { }
  24
  25 void OpenGLCommands::use_pipeline(const PipelineState *ps)
  26 {
  27         pipeline_state = ps;
  28         if(!pipeline_state)
  29                 OpenGLPipelineState::clear();
  30 }
  31
  32 void OpenGLCommands::clear(const ClearValue *values)
  33 {
  34         const Framebuffer *target = pipeline_state->get_framebuffer();
  35         if(!target)
  36                 throw invalid_operation("OpenGLCommands::clear");
  37
  38         if(!ARB_direct_state_access)
  39         {
  40                 static Require _req(MSP_clear_buffer);
  41                 pipeline_state->apply();
  42         }
  43
  44         unsigned i = 0;
  45         for(FrameAttachment a: target->get_format())
  46         {
  47                 if(get_attach_point(a)==get_attach_point(DEPTH_ATTACHMENT))
  48                 {
  49                         if(ARB_direct_state_access)
  50                                 glClearNamedFramebufferfv(target->id, GL_DEPTH, 0, &values->depth_stencil.depth);
  51                         else
  52                                 glClearBufferfv(GL_DEPTH, 0, &values->depth_stencil.depth);
  53                 }
  54                 else if(get_attach_point(a)==get_attach_point(STENCIL_ATTACHMENT))
  55                 {
  56                         if(ARB_direct_state_access)
  57                                 glClearNamedFramebufferiv(target->id, GL_STENCIL, 0, &values->depth_stencil.stencil);
  58                         else
  59                                 glClearBufferiv(GL_STENCIL, 0, &values->depth_stencil.stencil);
  60                 }
  61                 else
  62                 {
  63                         if(ARB_direct_state_access)
  64                                 glClearNamedFramebufferfv(target->id, GL_COLOR, i++, &values->color.r);
  65                         else
  66                                 glClearBufferfv(GL_COLOR, i++, &values->color.r);
  67                 }
  68                 ++values;
  69         }
  70 }
  71
  72 void OpenGLCommands::draw(const Batch &batch)
  73 {
  74         pipeline_state->apply();
  75         void *data_ptr = reinterpret_cast<void *>(batch.get_offset());
  76         glDrawElements(batch.gl_prim_type, batch.size(), batch.gl_index_type, data_ptr);
  77 }
  78
  79 void OpenGLCommands::draw_instanced(const Batch &batch, unsigned count)
  80 {
  81         static Require req(ARB_draw_instanced);
  82
  83         pipeline_state->apply();
  84         void *data_ptr = reinterpret_cast<void *>(batch.get_offset());
  85         glDrawElementsInstanced(batch.gl_prim_type, batch.size(), batch.gl_index_type, data_ptr, count);
  86 }
  87
  88 void OpenGLCommands::resolve_multisample(Framebuffer &target)
  89 {
  90         static Require _req(EXT_framebuffer_blit);
  91
  92         const Framebuffer *source = pipeline_state->get_framebuffer();
  93
  94         unsigned width = min(source->get_width(), target.get_width());
  95         unsigned height = min(source->get_height(), target.get_height());
  96         unsigned buffers = get_gl_buffer_bits(source->get_format())&get_gl_buffer_bits(target.get_format());
  97
  98         if(ARB_direct_state_access)
  99                 glBlitNamedFramebuffer(source->id, target.id, 0, 0, width, height, 0, 0, width, height, buffers, GL_NEAREST);
 100         else
 101         {
 102                 glBindFramebuffer(GL_READ_FRAMEBUFFER, source->id);
 103                 glBindFramebuffer(GL_DRAW_FRAMEBUFFER, target.id);
 104
 105                 target.refresh();
 106
 107                 glBlitFramebuffer(0, 0, width, height, 0, 0, width, height, buffers, GL_NEAREST);
 108
 109                 glBindFramebuffer(GL_FRAMEBUFFER, source->id);
 110         }
 111 }
 112
 113 void OpenGLCommands::begin_query(const QueryPool &pool, unsigned index)
 114 {
 115         if(index>=pool.queries.size())
 116                 throw out_of_range("OpenGLCommands::begin_query");
 117         glBeginQuery(pool.gl_type, pool.queries[index]);
 118 }
 119
 120 void OpenGLCommands::end_query(const QueryPool &pool, unsigned)
 121 {
 122         glEndQuery(pool.gl_type);
 123 }
 124
 125 } // namespace GL
 126 } // namespace Msp