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