source/core/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 <msp/gl/extensions/khr_debug.h>
   9 #include "buffer.h"
  10 #include "deviceinfo.h"
  11 #include "error.h"
  12 #include "gl.h"
  13 #include "misc.h"
  14 #include "vertexarray.h"
  15 #include "vertexsetup.h"
  16
  17 using namespace std;
  18
  19 namespace Msp {
  20 namespace GL {
  21
  22 VertexSetup::VertexSetup():
  23         dirty(0),
  24         vertex_array(0),
  25         inst_array(0),
  26         index_buffer(0),
  27         index_type(UNSIGNED_SHORT)
  28 {
  29         static Require req(ARB_vertex_array_object);
  30         if(ARB_direct_state_access)
  31                 glCreateVertexArrays(1, &id);
  32         else
  33                 glGenVertexArrays(1, &id);
  34 }
  35
  36 VertexSetup::~VertexSetup()
  37 {
  38         glDeleteVertexArrays(1, &id);
  39 }
  40
  41 void VertexSetup::set_format(const VertexFormat &vfmt)
  42 {
  43         if(!verify_format(vfmt))
  44                 throw invalid_argument("VertexSetup::set_format");
  45         if(!vertex_format.empty())
  46                 throw invalid_operation("VertexSetup::set_format");
  47
  48         vertex_format = vfmt;
  49 }
  50
  51 void VertexSetup::set_format_instanced(const VertexFormat &vfmt, const VertexFormat &ifmt)
  52 {
  53         if(!verify_format(vfmt) || !verify_format(ifmt))
  54                 throw invalid_argument("VertexSetup::set_format");
  55         if(!vertex_format.empty())
  56                 throw invalid_operation("VertexSetup::set_format");
  57
  58         vertex_format = vfmt;
  59         inst_format = ifmt;
  60 }
  61
  62 void VertexSetup::set_vertex_array(const VertexArray &a)
  63 {
  64         if(vertex_format.empty())
  65                 throw invalid_operation("VertexSetup::set_vertex_array");
  66         if(a.get_format()!=vertex_format)
  67                 throw incompatible_data("VertexSetup::set_vertex_array");
  68         if(!a.get_buffer())
  69                 throw invalid_argument("VertexSetup::set_vertex_array");
  70
  71         vertex_array = &a;
  72         dirty |= VERTEX_ARRAY;
  73 }
  74
  75 void VertexSetup::set_instance_array(const VertexArray &a)
  76 {
  77         if(inst_format.empty())
  78                 throw invalid_operation("VertexSetup::set_instance_array");
  79         if(a.get_format()!=inst_format)
  80                 throw incompatible_data("VertexSetup::set_instance_array");
  81         if(!a.get_buffer())
  82                 throw invalid_argument("VertexSetup::set_instance_array");
  83
  84         static Require req(ARB_instanced_arrays);
  85
  86         inst_array = &a;
  87         dirty |= INSTANCE_ARRAY;
  88 }
  89
  90 void VertexSetup::set_index_buffer(const Buffer &ibuf, DataType itype)
  91 {
  92         index_buffer = &ibuf;
  93         index_type = itype;
  94         dirty |= INDEX_BUFFER;
  95 }
  96
  97 bool VertexSetup::verify_format(const VertexFormat &fmt)
  98 {
  99         if(fmt.empty())
 100                 return false;
 101
 102         unsigned max_attribs = Limits::get_global().max_vertex_attributes;
 103
 104         for(const unsigned char *a=fmt.begin(); a!=fmt.end(); ++a)
 105                 if(get_attribute_semantic(*a)>=max_attribs)
 106                         return false;
 107
 108         return true;
 109 }
 110
 111 void VertexSetup::update() const
 112 {
 113         static bool direct = ARB_direct_state_access && ARB_vertex_attrib_binding;
 114
 115         if(dirty&VERTEX_ARRAY)
 116                 update_vertex_array(*vertex_array, 0, 0, direct);
 117
 118         if(dirty&INSTANCE_ARRAY)
 119                 update_vertex_array(*inst_array, 1, 1, direct);
 120
 121         if(dirty&INDEX_BUFFER)
 122         {
 123                 if(direct)
 124                         glVertexArrayElementBuffer(id, index_buffer->get_id());
 125                 else
 126                         glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, index_buffer->get_id());
 127         }
 128
 129         dirty = 0;
 130 }
 131
 132 void VertexSetup::update_vertex_array(const VertexArray &array, unsigned binding, unsigned divisor, bool direct) const
 133 {
 134         if(!direct)
 135                 glBindBuffer(GL_ARRAY_BUFFER, array.get_buffer()->get_id());
 136
 137         const VertexFormat &fmt = array.get_format();
 138         unsigned stride = fmt.stride()*sizeof(float);
 139         if(direct)
 140         {
 141                 glVertexArrayVertexBuffer(id, binding, array.get_buffer()->get_id(), 0, stride);
 142                 glVertexArrayBindingDivisor(id, binding, divisor);
 143         }
 144
 145         unsigned offset = 0;
 146         for(const unsigned char *a=fmt.begin(); a!=fmt.end(); ++a)
 147         {
 148                 unsigned sem = get_attribute_semantic(*a);
 149                 unsigned sz = get_attribute_size(*a);
 150                 if(direct)
 151                 {
 152                         if(*a==COLOR4_UBYTE)
 153                                 glVertexArrayAttribFormat(id, sem, 4, GL_UNSIGNED_BYTE, true, offset);
 154                         else
 155                                 glVertexArrayAttribFormat(id, sem, sz, GL_FLOAT, false, offset);
 156                         glVertexArrayAttribBinding(id, sem, binding);
 157                         glEnableVertexArrayAttrib(id, sem);
 158                 }
 159                 else
 160                 {
 161                         if(*a==COLOR4_UBYTE)
 162                                 glVertexAttribPointer(sem, 4, GL_UNSIGNED_BYTE, true, stride, reinterpret_cast<unsigned char *>(offset));
 163                         else
 164                                 glVertexAttribPointer(sem, sz, GL_FLOAT, false, stride, reinterpret_cast<float *>(offset));
 165                         if(ARB_instanced_arrays)
 166                                 glVertexAttribDivisor(sem, divisor);
 167                         glEnableVertexAttribArray(sem);
 168                 }
 169                 offset += sz*sizeof(float);
 170         }
 171
 172         if(!direct)
 173                 glBindBuffer(GL_ARRAY_BUFFER, 0);
 174 }
 175
 176 void VertexSetup::unload()
 177 {
 178         if(ARB_direct_state_access)
 179         {
 180                 glVertexArrayVertexBuffer(id, 0, 0, 0, 0);
 181                 glVertexArrayVertexBuffer(id, 1, 0, 0, 0);
 182                 glVertexArrayElementBuffer(id, 0);
 183         }
 184         else
 185         {
 186                 glBindVertexArray(id);
 187                 glBindBuffer(GL_ARRAY_BUFFER, 0);
 188
 189                 for(const unsigned char *a=vertex_format.begin(); a!=vertex_format.end(); ++a)
 190                 {
 191                         unsigned sem = get_attribute_semantic(*a);
 192                         glDisableVertexAttribArray(sem);
 193                         glVertexAttribPointer(sem, 1, GL_FLOAT, false, 0, 0);
 194                 }
 195                 for(const unsigned char *a=inst_format.begin(); a!=inst_format.end(); ++a)
 196                 {
 197                         unsigned sem = get_attribute_semantic(*a);
 198                         glDisableVertexAttribArray(sem);
 199                         glVertexAttribPointer(sem, 1, GL_FLOAT, false, 0, 0);
 200                 }
 201
 202                 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
 203         }
 204
 205         vertex_array = 0;
 206         vertex_format = VertexFormat();
 207         inst_array = 0;
 208         inst_format = VertexFormat();
 209         index_buffer = 0;
 210 }
 211
 212 void VertexSetup::set_debug_name(const string &name)
 213 {
 214 #ifdef DEBUG
 215         if(KHR_debug)
 216                 glObjectLabel(GL_VERTEX_ARRAY, id, name.size(), name.c_str());
 217 #else
 218         (void)name;
 219 #endif
 220 }
 221
 222 } // namespace GL
 223 } // namespace Msp