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