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_instanced_arrays.h>
   4 #include <msp/gl/extensions/arb_vertex_array_object.h>
   5 #include <msp/gl/extensions/arb_vertex_attrib_binding.h>
   6 #include <msp/gl/extensions/arb_vertex_buffer_object.h>
   7 #include <msp/gl/extensions/arb_vertex_shader.h>
   8 #include "buffer.h"
   9 #include "error.h"
  10 #include "gl.h"
  11 #include "vertexarray.h"
  12 #include "vertexsetup.h"
  13
  14 using namespace std;
  15
  16 namespace Msp {
  17 namespace GL {
  18
  19 VertexSetup::VertexSetup():
  20         dirty(0),
  21         vertex_array(0),
  22         inst_array(0),
  23         index_buffer(0)
  24 {
  25         static Require req(ARB_vertex_array_object);
  26         if(ARB_direct_state_access)
  27                 glCreateVertexArrays(1, &id);
  28         else
  29                 glGenVertexArrays(1, &id);
  30 }
  31
  32 VertexSetup::~VertexSetup()
  33 {
  34         if(current()==this)
  35                 unbind();
  36         glDeleteVertexArrays(1, &id);
  37 }
  38
  39 void VertexSetup::set_vertex_array(const VertexArray &a)
  40 {
  41         if(!a.get_buffer())
  42                 throw invalid_argument("VertexSetup::set_vertex_array");
  43
  44         vertex_array = &a;
  45         update(VERTEX_ARRAY);
  46 }
  47
  48 void VertexSetup::set_instance_array(const VertexArray *a)
  49 {
  50         if(a)
  51         {
  52                 if(!a->get_buffer())
  53                         throw invalid_argument("VertexSetup::set_instance_array");
  54
  55                 static Require req(ARB_instanced_arrays);
  56         }
  57
  58         inst_array = a;
  59         update(INSTANCE_ARRAY);
  60 }
  61
  62 void VertexSetup::set_index_buffer(const Buffer &ibuf)
  63 {
  64         index_buffer = &ibuf;
  65         update(INDEX_BUFFER);
  66 }
  67
  68 void VertexSetup::update(unsigned mask) const
  69 {
  70         static bool direct = ARB_direct_state_access && ARB_vertex_attrib_binding;
  71         if(!direct && current()!=this)
  72         {
  73                 dirty |= mask;
  74                 return;
  75         }
  76
  77         if(mask&VERTEX_ARRAY)
  78                 update_vertex_array(*vertex_array, 0, 0, direct);
  79
  80         if(mask&INSTANCE_ARRAY)
  81         {
  82                 if(inst_array)
  83                         update_vertex_array(*inst_array, 1, 1, direct);
  84         }
  85
  86         if(mask&INDEX_BUFFER)
  87         {
  88                 if(direct)
  89                         glVertexArrayElementBuffer(id, index_buffer->get_id());
  90                 else
  91                         glBindBuffer(ELEMENT_ARRAY_BUFFER, index_buffer->get_id());
  92         }
  93 }
  94
  95 void VertexSetup::update_vertex_array(const VertexArray &array, unsigned binding, unsigned divisor, bool direct) const
  96 {
  97         Conditional<Bind> bind_vbuf(!direct, array.get_buffer(), ARRAY_BUFFER);
  98
  99         const VertexFormat &fmt = array.get_format();
 100         unsigned stride = get_stride(fmt)*sizeof(float);
 101         if(direct)
 102         {
 103                 glVertexArrayVertexBuffer(id, binding, array.get_buffer()->get_id(), 0, stride);
 104                 glVertexArrayBindingDivisor(id, binding, divisor);
 105         }
 106
 107         unsigned offset = 0;
 108         for(const unsigned char *c=fmt.begin(); c!=fmt.end(); ++c)
 109         {
 110                 unsigned t = get_component_type(*c);
 111                 if(t>=get_component_type(ATTRIB1))
 112                         t -= get_component_type(ATTRIB1);
 113                 unsigned sz = get_component_size(*c);
 114                 if(direct)
 115                 {
 116                         if(*c==COLOR4_UBYTE)
 117                                 glVertexArrayAttribFormat(id, t, 4, GL_UNSIGNED_BYTE, true, offset);
 118                         else
 119                                 glVertexArrayAttribFormat(id, t, sz, GL_FLOAT, false, offset);
 120                         glVertexArrayAttribBinding(id, t, binding);
 121                         glEnableVertexArrayAttrib(id, t);
 122                 }
 123                 else
 124                 {
 125                         if(*c==COLOR4_UBYTE)
 126                                 glVertexAttribPointer(t, 4, GL_UNSIGNED_BYTE, true, stride, reinterpret_cast<unsigned char *>(offset));
 127                         else
 128                                 glVertexAttribPointer(t, sz, GL_FLOAT, false, stride, reinterpret_cast<float *>(offset));
 129                         glVertexAttribDivisor(t, divisor);
 130                         glEnableVertexAttribArray(t);
 131                 }
 132                 offset += sz*sizeof(float);
 133         }
 134 }
 135
 136 void VertexSetup::bind() const
 137 {
 138         if(!vertex_array || !index_buffer)
 139                 throw invalid_operation("VertexSetup::bind");
 140
 141         if(set_current(this))
 142         {
 143                 vertex_array->refresh();
 144                 if(inst_array)
 145                         inst_array->refresh();
 146                 glBindVertexArray(id);
 147                 if(dirty)
 148                 {
 149                         update(dirty);
 150                         dirty = 0;
 151                 }
 152         }
 153 }
 154
 155 void VertexSetup::unbind()
 156 {
 157         if(set_current(0))
 158                 glBindVertexArray(0);
 159 }
 160
 161 } // namespace GL
 162 } // namespace Msp