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         if(!pipeline_state)
  26                 PipelineState::clear();
  27 }
  28
  29 void Commands::clear(const ClearValue *values)
  30 {
  31         const Framebuffer *target = pipeline_state->get_framebuffer();
  32         if(!target)
  33                 throw invalid_operation("OpenGLCommands::clear");
  34
  35         if(!ARB_direct_state_access)
  36         {
  37                 static Require _req(MSP_clear_buffer);
  38                 pipeline_state->apply();
  39         }
  40
  41         unsigned i = 0;
  42         for(FrameAttachment a: target->get_format())
  43         {
  44                 if(get_attach_point(a)==get_attach_point(DEPTH_ATTACHMENT))
  45                 {
  46                         if(ARB_direct_state_access)
  47                                 glClearNamedFramebufferfv(target->id, GL_DEPTH, 0, &values->depth_stencil.depth);
  48                         else
  49                                 glClearBufferfv(GL_DEPTH, 0, &values->depth_stencil.depth);
  50                 }
  51                 else if(get_attach_point(a)==get_attach_point(STENCIL_ATTACHMENT))
  52                 {
  53                         if(ARB_direct_state_access)
  54                                 glClearNamedFramebufferiv(target->id, GL_STENCIL, 0, &values->depth_stencil.stencil);
  55                         else
  56                                 glClearBufferiv(GL_STENCIL, 0, &values->depth_stencil.stencil);
  57                 }
  58                 else
  59                 {
  60                         if(ARB_direct_state_access)
  61                                 glClearNamedFramebufferfv(target->id, GL_COLOR, i++, &values->color.r);
  62                         else
  63                                 glClearBufferfv(GL_COLOR, i++, &values->color.r);
  64                 }
  65                 ++values;
  66         }
  67 }
  68
  69 void Commands::draw(const Batch &batch)
  70 {
  71         pipeline_state->apply();
  72         void *data_ptr = reinterpret_cast<void *>(batch.get_offset());
  73         glDrawElements(batch.get_gl_primitive_type(), batch.size(), batch.get_gl_index_type(), data_ptr);
  74 }
  75
  76 void Commands::draw_instanced(const Batch &batch, unsigned count)
  77 {
  78         static Require req(ARB_draw_instanced);
  79
  80         pipeline_state->apply();
  81         void *data_ptr = reinterpret_cast<void *>(batch.get_offset());
  82         glDrawElementsInstanced(batch.get_gl_primitive_type(), batch.size(), batch.get_gl_index_type(), data_ptr, count);
  83 }
  84
  85 void Commands::resolve_multisample(Framebuffer &target)
  86 {
  87         static Require _req(EXT_framebuffer_blit);
  88
  89         const Framebuffer *source = pipeline_state->get_framebuffer();
  90
  91         unsigned width = min(source->get_width(), target.get_width());
  92         unsigned height = min(source->get_height(), target.get_height());
  93         unsigned buffers = get_gl_buffer_bits(source->get_format())&get_gl_buffer_bits(target.get_format());
  94
  95         if(ARB_direct_state_access)
  96                 glBlitNamedFramebuffer(source->id, target.id, 0, 0, width, height, 0, 0, width, height, buffers, GL_NEAREST);
  97         else
  98         {
  99                 glBindFramebuffer(GL_READ_FRAMEBUFFER, source->id);
 100                 glBindFramebuffer(GL_DRAW_FRAMEBUFFER, target.id);
 101
 102                 target.refresh();
 103
 104                 glBlitFramebuffer(0, 0, width, height, 0, 0, width, height, buffers, GL_NEAREST);
 105
 106                 glBindFramebuffer(GL_FRAMEBUFFER, source->id);
 107         }
 108 }
 109
 110 } // namespace GL
 111 } // namespace Msp