source/vertexsetup.cpp

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