source/core/commands.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/ext_framebuffer_blit.h>
   5 #include <msp/gl/extensions/ext_framebuffer_object.h>
   6 #include "batch.h"
   7 #include "commands.h"
   8 #include "gl.h"
   9 #include "pipelinestate.h"
  10
  11 using namespace std;
  12
  13 namespace Msp {
  14 namespace GL {
  15
  16 Commands::Commands():
  17         pipeline_state(0)
  18 { }
  19
  20 void Commands::use_pipeline(const PipelineState &ps)
  21 {
  22         pipeline_state = &ps;
  23 }
  24
  25 void Commands::clear(BufferBits buffers)
  26 {
  27         pipeline_state->apply();
  28         glClear(buffers);
  29 }
  30
  31 void Commands::draw(const Batch &batch)
  32 {
  33         pipeline_state->apply();
  34         void *data_ptr = reinterpret_cast<void *>(batch.get_offset());
  35         glDrawElements(batch.get_gl_primitive_type(), batch.size(), batch.get_gl_index_type(), data_ptr);
  36 }
  37
  38 void Commands::draw_instanced(const Batch &batch, unsigned count)
  39 {
  40         static Require req(ARB_draw_instanced);
  41
  42         pipeline_state->apply();
  43         void *data_ptr = reinterpret_cast<void *>(batch.get_offset());
  44         glDrawElementsInstanced(batch.get_gl_primitive_type(), batch.size(), batch.get_gl_index_type(), data_ptr, count);
  45 }
  46
  47 void Commands::resolve_multisample(Framebuffer &target, BufferBits buffers)
  48 {
  49         static Require _req(EXT_framebuffer_blit);
  50
  51         const Framebuffer *source = pipeline_state->get_framebuffer();
  52
  53         unsigned width = min(source->get_width(), target.get_width());
  54         unsigned height = min(source->get_height(), target.get_height());
  55
  56         if(ARB_direct_state_access)
  57                 glBlitNamedFramebuffer(source->id, target.id, 0, 0, width, height, 0, 0, width, height, buffers, GL_NEAREST);
  58         else
  59         {
  60                 glBindFramebuffer(GL_READ_FRAMEBUFFER, source->id);
  61                 glBindFramebuffer(GL_DRAW_FRAMEBUFFER, target.id);
  62
  63                 target.refresh();
  64
  65                 glBlitFramebuffer(0, 0, width, height, 0, 0, width, height, buffers, GL_NEAREST);
  66
  67                 glBindFramebuffer(GL_FRAMEBUFFER, source->id);
  68         }
  69 }
  70
  71 } // namespace GL
  72 } // namespace Msp