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