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/ext_gpu_shader4.h>
   9 #include <msp/gl/extensions/khr_debug.h>
  10 #include "buffer.h"
  11 #include "deviceinfo.h"
  12 #include "error.h"
  13 #include "gl.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         require_format(vfmt);
  49
  50         vertex_format = vfmt;
  51 }
  52
  53 void VertexSetup::set_format_instanced(const VertexFormat &vfmt, const VertexFormat &ifmt)
  54 {
  55         if(!verify_format(vfmt) || !verify_format(ifmt))
  56                 throw invalid_argument("VertexSetup::set_format");
  57         if(!vertex_format.empty())
  58                 throw invalid_operation("VertexSetup::set_format");
  59
  60         require_format(vfmt);
  61         require_format(ifmt);
  62
  63         vertex_format = vfmt;
  64         inst_format = ifmt;
  65 }
  66
  67 void VertexSetup::set_vertex_array(const VertexArray &a)
  68 {
  69         if(vertex_format.empty())
  70                 throw invalid_operation("VertexSetup::set_vertex_array");
  71         if(a.get_format()!=vertex_format)
  72                 throw incompatible_data("VertexSetup::set_vertex_array");
  73         if(!a.get_buffer())
  74                 throw invalid_argument("VertexSetup::set_vertex_array");
  75
  76         vertex_array = &a;
  77         dirty |= VERTEX_ARRAY;
  78 }
  79
  80 void VertexSetup::set_instance_array(const VertexArray &a)
  81 {
  82         if(inst_format.empty())
  83                 throw invalid_operation("VertexSetup::set_instance_array");
  84         if(a.get_format()!=inst_format)
  85                 throw incompatible_data("VertexSetup::set_instance_array");
  86         if(!a.get_buffer())
  87                 throw invalid_argument("VertexSetup::set_instance_array");
  88
  89         static Require req(ARB_instanced_arrays);
  90
  91         inst_array = &a;
  92         dirty |= INSTANCE_ARRAY;
  93 }
  94
  95 void VertexSetup::set_index_buffer(const Buffer &ibuf, DataType itype)
  96 {
  97         index_buffer = &ibuf;
  98         index_type = itype;
  99         dirty |= INDEX_BUFFER;
 100 }
 101
 102 bool VertexSetup::verify_format(const VertexFormat &fmt)
 103 {
 104         if(fmt.empty())
 105                 return false;
 106
 107         unsigned max_attribs = Limits::get_global().max_vertex_attributes;
 108
 109         for(VertexAttribute a: fmt)
 110                 if(get_attribute_semantic(a)>=max_attribs)
 111                         return false;
 112
 113         return true;
 114 }
 115
 116 void VertexSetup::require_format(const VertexFormat &fmt)
 117 {
 118         bool has_int = false;
 119         for(VertexAttribute a: fmt)
 120                 has_int = has_int | is_integer_attribute(a);
 121
 122         if(has_int)
 123                 static Require _req(EXT_gpu_shader4);
 124 }
 125
 126 void VertexSetup::update() const
 127 {
 128         static bool direct = ARB_direct_state_access && ARB_vertex_attrib_binding;
 129
 130         if(dirty&VERTEX_ARRAY)
 131                 update_vertex_array(*vertex_array, 0, 0, direct);
 132
 133         if(dirty&INSTANCE_ARRAY)
 134                 update_vertex_array(*inst_array, 1, 1, direct);
 135
 136         if(dirty&INDEX_BUFFER)
 137         {
 138                 if(direct)
 139                         glVertexArrayElementBuffer(id, index_buffer->id);
 140                 else
 141                         glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, index_buffer->id);
 142         }
 143
 144         dirty = 0;
 145 }
 146
 147 void VertexSetup::update_vertex_array(const VertexArray &array, unsigned binding, unsigned divisor, bool direct) const
 148 {
 149         if(!direct)
 150         {
 151                 Buffer::unbind_scratch();
 152                 glBindBuffer(GL_ARRAY_BUFFER, array.get_buffer()->id);
 153         }
 154
 155         const VertexFormat &fmt = array.get_format();
 156         unsigned stride = fmt.stride();
 157         if(direct)
 158         {
 159                 glVertexArrayVertexBuffer(id, binding, array.get_buffer()->id, 0, stride);
 160                 glVertexArrayBindingDivisor(id, binding, divisor);
 161         }
 162
 163         unsigned offset = 0;
 164         for(VertexAttribute a: fmt)
 165         {
 166                 unsigned sem = get_attribute_semantic(a);
 167                 bool integer = is_integer_attribute(a);
 168                 GLenum type = get_gl_type(get_attribute_source_type(a));
 169                 unsigned cc = get_attribute_component_count(a);
 170                 if(direct)
 171                 {
 172                         if(integer)
 173                                 glVertexArrayAttribIFormat(id, sem, cc, type, offset);
 174                         else
 175                                 glVertexArrayAttribFormat(id, sem, cc, type, true, offset);
 176                         glVertexArrayAttribBinding(id, sem, binding);
 177                         glEnableVertexArrayAttrib(id, sem);
 178                 }
 179                 else
 180                 {
 181                         if(integer)
 182                                 glVertexAttribIPointer(sem, cc, type, stride, reinterpret_cast<void *>(offset));
 183                         else
 184                                 glVertexAttribPointer(sem, cc, type, true, stride, reinterpret_cast<void *>(offset));
 185                         if(ARB_instanced_arrays)
 186                                 glVertexAttribDivisor(sem, divisor);
 187                         glEnableVertexAttribArray(sem);
 188                 }
 189                 offset += get_attribute_size(a);
 190         }
 191
 192         if(!direct)
 193                 glBindBuffer(GL_ARRAY_BUFFER, 0);
 194 }
 195
 196 void VertexSetup::unload()
 197 {
 198         if(ARB_direct_state_access)
 199         {
 200                 glVertexArrayVertexBuffer(id, 0, 0, 0, 0);
 201                 glVertexArrayVertexBuffer(id, 1, 0, 0, 0);
 202                 glVertexArrayElementBuffer(id, 0);
 203         }
 204         else
 205         {
 206                 glBindVertexArray(id);
 207                 glBindBuffer(GL_ARRAY_BUFFER, 0);
 208
 209                 for(VertexAttribute a: vertex_format)
 210                 {
 211                         unsigned sem = get_attribute_semantic(a);
 212                         glDisableVertexAttribArray(sem);
 213                         glVertexAttribPointer(sem, 1, GL_FLOAT, false, 0, 0);
 214                 }
 215                 for(VertexAttribute a: inst_format)
 216                 {
 217                         unsigned sem = get_attribute_semantic(a);
 218                         glDisableVertexAttribArray(sem);
 219                         glVertexAttribPointer(sem, 1, GL_FLOAT, false, 0, 0);
 220                 }
 221
 222                 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
 223         }
 224
 225         vertex_array = 0;
 226         vertex_format = VertexFormat();
 227         inst_array = 0;
 228         inst_format = VertexFormat();
 229         index_buffer = 0;
 230 }
 231
 232 void VertexSetup::set_debug_name(const string &name)
 233 {
 234 #ifdef DEBUG
 235         if(KHR_debug)
 236                 glObjectLabel(GL_VERTEX_ARRAY, id, name.size(), name.c_str());
 237 #else
 238         (void)name;
 239 #endif
 240 }
 241
 242 } // namespace GL
 243 } // namespace Msp