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->get_framebuffer();
  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         pipeline_state->apply();
  54         void *data_ptr = reinterpret_cast<void *>(batch.get_offset());
  55         glDrawElements(batch.gl_prim_type, batch.size(), batch.gl_index_type, data_ptr);
  56 }
  57
  58 void OpenGLCommands::draw_instanced(const Batch &batch, unsigned count)
  59 {
  60         static Require req(ARB_draw_instanced);
  61
  62         pipeline_state->apply();
  63         void *data_ptr = reinterpret_cast<void *>(batch.get_offset());
  64         glDrawElementsInstanced(batch.gl_prim_type, batch.size(), batch.gl_index_type, data_ptr, count);
  65 }
  66
  67 void OpenGLCommands::resolve_multisample(Framebuffer &target)
  68 {
  69         static Require _req(EXT_framebuffer_blit);
  70
  71         const Framebuffer *source = pipeline_state->get_framebuffer();
  72
  73         unsigned width = min(source->get_width(), target.get_width());
  74         unsigned height = min(source->get_height(), target.get_height());
  75         unsigned buffers = get_gl_buffer_bits(source->get_format())&get_gl_buffer_bits(target.get_format());
  76
  77         if(ARB_direct_state_access)
  78                 glBlitNamedFramebuffer(source->id, target.id, 0, 0, width, height, 0, 0, width, height, buffers, GL_NEAREST);
  79         else
  80         {
  81                 glBindFramebuffer(GL_READ_FRAMEBUFFER, source->id);
  82                 glBindFramebuffer(GL_DRAW_FRAMEBUFFER, target.id);
  83
  84                 target.refresh();
  85
  86                 glBlitFramebuffer(0, 0, width, height, 0, 0, width, height, buffers, GL_NEAREST);
  87
  88                 glBindFramebuffer(GL_FRAMEBUFFER, source->id);
  89         }
  90 }
  91
  92 void OpenGLCommands::begin_query(const QueryPool &pool, unsigned index)
  93 {
  94         if(index>=pool.queries.size())
  95                 throw out_of_range("OpenGLCommands::begin_query");
  96         glBeginQuery(pool.gl_type, pool.queries[index]);
  97 }
  98
  99 void OpenGLCommands::end_query(const QueryPool &pool, unsigned)
 100 {
 101         glEndQuery(pool.gl_type);
 102 }
 103
 104 } // namespace GL
 105 } // namespace Msp