source/vertexsetup.cpp

   1 #include <msp/core/raii.h>
   2 #include <msp/gl/extensions/arb_direct_state_access.h>
   3 #include <msp/gl/extensions/arb_vertex_array_object.h>
   4 #include <msp/gl/extensions/arb_vertex_attrib_binding.h>
   5 #include <msp/gl/extensions/arb_vertex_buffer_object.h>
   6 #include <msp/gl/extensions/arb_vertex_shader.h>
   7 #include "buffer.h"
   8 #include "gl.h"
   9 #include "vertexarray.h"
  10 #include "vertexsetup.h"
  11
  12 namespace Msp {
  13 namespace GL {
  14
  15 VertexSetup::VertexSetup():
  16         dirty(0),
  17         array(0),
  18         index_buffer(0)
  19 {
  20         static Require req(ARB_vertex_array_object);
  21         if(ARB_direct_state_access)
  22                 glCreateVertexArrays(1, &id);
  23         else
  24                 glGenVertexArrays(1, &id);
  25 }
  26
  27 VertexSetup::~VertexSetup()
  28 {
  29         if(current()==this)
  30                 unbind();
  31         glDeleteVertexArrays(1, &id);
  32 }
  33
  34 void VertexSetup::set_vertex_array(const VertexArray &a)
  35 {
  36         array = &a;
  37         update(VERTEX_ARRAY);
  38 }
  39
  40 void VertexSetup::set_index_buffer(const Buffer &ibuf)
  41 {
  42         index_buffer = &ibuf;
  43         update(INDEX_BUFFER);
  44 }
  45
  46 void VertexSetup::update(unsigned mask) const
  47 {
  48         static bool direct = ARB_direct_state_access && ARB_vertex_attrib_binding;
  49         if(!direct && current()!=this)
  50         {
  51                 dirty |= mask;
  52                 return;
  53         }
  54
  55         if(mask&VERTEX_ARRAY)
  56                 update_vertex_array(direct);
  57
  58         if(mask&INDEX_BUFFER)
  59         {
  60                 if(direct)
  61                         glVertexArrayElementBuffer(id, index_buffer->get_id());
  62                 else
  63                         glBindBuffer(ELEMENT_ARRAY_BUFFER, index_buffer->get_id());
  64         }
  65 }
  66
  67 void VertexSetup::update_vertex_array(bool direct) const
  68 {
  69         Conditional<Bind> bind_vbuf(!direct, array->get_buffer(), ARRAY_BUFFER);
  70
  71         const VertexFormat &fmt = array->get_format();
  72         unsigned stride = get_stride(fmt)*sizeof(float);
  73         if(direct)
  74                 glVertexArrayVertexBuffer(id, 0, array->get_buffer()->get_id(), 0, stride);
  75
  76         unsigned offset = 0;
  77         for(const unsigned char *c=fmt.begin(); c!=fmt.end(); ++c)
  78         {
  79                 unsigned t = get_component_type(*c);
  80                 if(t>=get_component_type(ATTRIB1))
  81                         t -= get_component_type(ATTRIB1);
  82                 unsigned sz = get_component_size(*c);
  83                 if(direct)
  84                 {
  85                         if(*c==COLOR4_UBYTE)
  86                                 glVertexArrayAttribFormat(id, t, 4, GL_UNSIGNED_BYTE, true, offset);
  87                         else
  88                                 glVertexArrayAttribFormat(id, t, sz, GL_FLOAT, false, offset);
  89                         glVertexArrayAttribBinding(id, t, 0);
  90                         glEnableVertexArrayAttrib(id, t);
  91                 }
  92                 else
  93                 {
  94                         if(*c==COLOR4_UBYTE)
  95                                 glVertexAttribPointer(t, 4, GL_UNSIGNED_BYTE, true, stride, reinterpret_cast<unsigned char *>(offset));
  96                         else
  97                                 glVertexAttribPointer(t, sz, GL_FLOAT, false, stride, reinterpret_cast<float *>(offset));
  98                         glEnableVertexAttribArray(t);
  99                 }
 100                 offset += sz*sizeof(float);
 101         }
 102 }
 103
 104 void VertexSetup::bind() const
 105 {
 106         if(set_current(this))
 107         {
 108                 glBindVertexArray(id);
 109                 if(dirty)
 110                 {
 111                         update(dirty);
 112                         dirty = 0;
 113                 }
 114         }
 115 }
 116
 117 void VertexSetup::unbind()
 118 {
 119         if(set_current(0))
 120                 glBindVertexArray(0);
 121 }
 122
 123 } // namespace GL
 124 } // namespace Msp