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 <msp/gl/extensions/msp_clear_buffer.h>
   7 #include "batch.h"
   8 #include "commands.h"
   9 #include "error.h"
  10 #include "gl.h"
  11 #include "pipelinestate.h"
  12
  13 using namespace std;
  14
  15 namespace Msp {
  16 namespace GL {
  17
  18 Commands::Commands():
  19         pipeline_state(0)
  20 { }
  21
  22 void Commands::use_pipeline(const PipelineState &ps)
  23 {
  24         pipeline_state = &ps;
  25 }
  26
  27 void Commands::clear(const ClearValue *values)
  28 {
  29         const Framebuffer *target = pipeline_state->get_framebuffer();
  30         if(!target)
  31                 throw invalid_operation("OpenGLCommands::clear");
  32
  33         if(!ARB_direct_state_access)
  34         {
  35                 static Require _req(MSP_clear_buffer);
  36                 pipeline_state->apply();
  37         }
  38
  39         unsigned i = 0;
  40         for(FrameAttachment a: target->get_format())
  41         {
  42                 if(get_attach_point(a)==get_attach_point(DEPTH_ATTACHMENT))
  43                 {
  44                         if(ARB_direct_state_access)
  45                                 glClearNamedFramebufferfv(target->id, GL_DEPTH, 0, &values->depth_stencil.depth);
  46                         else
  47                                 glClearBufferfv(GL_DEPTH, 0, &values->depth_stencil.depth);
  48                 }
  49                 else if(get_attach_point(a)==get_attach_point(STENCIL_ATTACHMENT))
  50                 {
  51                         if(ARB_direct_state_access)
  52                                 glClearNamedFramebufferiv(target->id, GL_STENCIL, 0, &values->depth_stencil.stencil);
  53                         else
  54                                 glClearBufferiv(GL_STENCIL, 0, &values->depth_stencil.stencil);
  55                 }
  56                 else
  57                 {
  58                         if(ARB_direct_state_access)
  59                                 glClearNamedFramebufferfv(target->id, GL_COLOR, i++, &values->color.r);
  60                         else
  61                                 glClearBufferfv(GL_COLOR, i++, &values->color.r);
  62                 }
  63                 ++values;
  64         }
  65 }
  66
  67 void Commands::draw(const Batch &batch)
  68 {
  69         pipeline_state->apply();
  70         void *data_ptr = reinterpret_cast<void *>(batch.get_offset());
  71         glDrawElements(batch.get_gl_primitive_type(), batch.size(), batch.get_gl_index_type(), data_ptr);
  72 }
  73
  74 void Commands::draw_instanced(const Batch &batch, unsigned count)
  75 {
  76         static Require req(ARB_draw_instanced);
  77
  78         pipeline_state->apply();
  79         void *data_ptr = reinterpret_cast<void *>(batch.get_offset());
  80         glDrawElementsInstanced(batch.get_gl_primitive_type(), batch.size(), batch.get_gl_index_type(), data_ptr, count);
  81 }
  82
  83 void Commands::resolve_multisample(Framebuffer &target, BufferBits buffers)
  84 {
  85         static Require _req(EXT_framebuffer_blit);
  86
  87         const Framebuffer *source = pipeline_state->get_framebuffer();
  88
  89         unsigned width = min(source->get_width(), target.get_width());
  90         unsigned height = min(source->get_height(), target.get_height());
  91
  92         if(ARB_direct_state_access)
  93                 glBlitNamedFramebuffer(source->id, target.id, 0, 0, width, height, 0, 0, width, height, buffers, GL_NEAREST);
  94         else
  95         {
  96                 glBindFramebuffer(GL_READ_FRAMEBUFFER, source->id);
  97                 glBindFramebuffer(GL_DRAW_FRAMEBUFFER, target.id);
  98
  99                 target.refresh();
 100
 101                 glBlitFramebuffer(0, 0, width, height, 0, 0, width, height, buffers, GL_NEAREST);
 102
 103                 glBindFramebuffer(GL_FRAMEBUFFER, source->id);
 104         }
 105 }
 106
 107 } // namespace GL
 108 } // namespace Msp