source/backends/opengl/commands_backend.cpp

   1 #include <algorithm>
   2 #include <msp/gl/extensions/arb_compute_shader.h>
   3 #include <msp/gl/extensions/arb_direct_state_access.h>
   4 #include <msp/gl/extensions/arb_draw_instanced.h>
   5 #include <msp/gl/extensions/arb_occlusion_query.h>
   6 #include <msp/gl/extensions/ext_framebuffer_blit.h>
   7 #include <msp/gl/extensions/ext_framebuffer_object.h>
   8 #include <msp/gl/extensions/msp_clear_buffer.h>
   9 #include "batch.h"
  10 #include "commands_backend.h"
  11 #include "error.h"
  12 #include "framebuffer.h"
  13 #include "gl.h"
  14 #include "pipelinestate.h"
  15 #include "query.h"
  16
  17 using namespace std;
  18
  19 namespace Msp {
  20 namespace GL {
  21
  22 void OpenGLCommands::submit_frame()
  23 {
  24         glFlush();
  25 }
  26
  27 void OpenGLCommands::use_pipeline(const PipelineState *ps)
  28 {
  29         pipeline_state = ps;
  30         if(!pipeline_state)
  31                 OpenGLPipelineState::clear();
  32 }
  33
  34 void OpenGLCommands::clear(const ClearValue *values)
  35 {
  36         const Framebuffer *target = (pipeline_state ? pipeline_state->get_framebuffer() : 0);
  37         if(!target)
  38                 throw invalid_operation("OpenGLCommands::clear");
  39
  40         if(!values)
  41                 return;
  42
  43         static Require _req(MSP_clear_buffer);
  44
  45         pipeline_state->apply();
  46
  47         unsigned i = 0;
  48         for(FrameAttachment a: target->get_format())
  49         {
  50                 if(get_attach_point(a)==get_attach_point(DEPTH_ATTACHMENT))
  51                         glClearBufferfv(GL_DEPTH, 0, &values->depth_stencil.depth);
  52                 else if(get_attach_point(a)==get_attach_point(STENCIL_ATTACHMENT))
  53                         glClearBufferiv(GL_STENCIL, 0, &values->depth_stencil.stencil);
  54                 else
  55                         glClearBufferfv(GL_COLOR, i++, &values->color.r);
  56                 ++values;
  57         }
  58 }
  59
  60 void OpenGLCommands::draw(const Batch &batch)
  61 {
  62         if(!pipeline_state)
  63                 throw invalid_operation("OpenGLCommands::draw");
  64
  65         pipeline_state->apply();
  66         void *data_ptr = reinterpret_cast<void *>(batch.get_offset());
  67         glDrawElements(batch.gl_prim_type, batch.size(), batch.gl_index_type, data_ptr);
  68 }
  69
  70 void OpenGLCommands::draw_instanced(const Batch &batch, unsigned count)
  71 {
  72         if(!pipeline_state)
  73                 throw invalid_operation("OpenGLCommands::draw_instanced");
  74
  75         static Require req(ARB_draw_instanced);
  76
  77         pipeline_state->apply();
  78         void *data_ptr = reinterpret_cast<void *>(batch.get_offset());
  79         glDrawElementsInstanced(batch.gl_prim_type, batch.size(), batch.gl_index_type, data_ptr, count);
  80 }
  81
  82 void OpenGLCommands::dispatch(unsigned count_x, unsigned count_y, unsigned count_z)
  83 {
  84         if(!pipeline_state)
  85                 throw invalid_operation("OpenGLCommands::dispatch_compute");
  86
  87         static Require req(ARB_compute_shader);
  88
  89         pipeline_state->apply();
  90         glDispatchCompute(count_x, count_y, count_z);
  91 }
  92
  93 void OpenGLCommands::resolve_multisample(Framebuffer &target)
  94 {
  95         const Framebuffer *source = (pipeline_state ? pipeline_state->get_framebuffer() : 0);
  96         if(!source)
  97                 throw invalid_operation("OpenGLCommands::draw");
  98
  99         static Require _req(EXT_framebuffer_blit);
 100
 101         unsigned width = min(source->get_width(), target.get_width());
 102         unsigned height = min(source->get_height(), target.get_height());
 103         unsigned buffers = get_gl_buffer_bits(source->get_format())&get_gl_buffer_bits(target.get_format());
 104
 105         if(ARB_direct_state_access)
 106         {
 107                 target.refresh();
 108                 glBlitNamedFramebuffer(source->id, target.id, 0, 0, width, height, 0, 0, width, height, buffers, GL_NEAREST);
 109         }
 110         else
 111         {
 112                 glBindFramebuffer(GL_READ_FRAMEBUFFER, source->id);
 113                 glBindFramebuffer(GL_DRAW_FRAMEBUFFER, target.id);
 114
 115                 target.refresh();
 116
 117                 glBlitFramebuffer(0, 0, width, height, 0, 0, width, height, buffers, GL_NEAREST);
 118
 119                 glBindFramebuffer(GL_FRAMEBUFFER, source->id);
 120         }
 121 }
 122
 123 void OpenGLCommands::begin_query(const QueryPool &pool, unsigned index)
 124 {
 125         if(index>=pool.queries.size())
 126                 throw out_of_range("OpenGLCommands::begin_query");
 127         glBeginQuery(pool.gl_type, pool.queries[index]);
 128 }
 129
 130 void OpenGLCommands::end_query(const QueryPool &pool, unsigned)
 131 {
 132         glEndQuery(pool.gl_type);
 133 }
 134
 135 } // namespace GL
 136 } // namespace Msp