src/graphicsbuffer.cpp

   1 #include "graphicsbuffer.h"
   2 #include "log.h"
   3
   4 using namespace IPDF;
   5
   6 static GLenum BufferUsageToGLUsage(GraphicsBuffer::BufferUsage buffer_usage)
   7 {
   8         GLenum usage;
   9         switch (buffer_usage)
  10         {
  11         case GraphicsBuffer::BufferUsageStaticDraw:
  12                 usage = GL_STATIC_DRAW;
  13                 break;
  14         case GraphicsBuffer::BufferUsageStaticRead:
  15                 usage = GL_STATIC_READ;
  16                 break;
  17         case GraphicsBuffer::BufferUsageStaticCopy:
  18                 usage = GL_STATIC_COPY;
  19                 break;
  20         case GraphicsBuffer::BufferUsageDynamicDraw:
  21                 usage = GL_DYNAMIC_DRAW;
  22                 break;
  23         case GraphicsBuffer::BufferUsageDynamicRead:
  24                 usage = GL_DYNAMIC_READ;
  25                 break;
  26         case GraphicsBuffer::BufferUsageDynamicCopy:
  27                 usage = GL_DYNAMIC_COPY;
  28                 break;
  29         case GraphicsBuffer::BufferUsageStreamDraw:
  30                 usage = GL_STREAM_DRAW;
  31                 break;
  32         case GraphicsBuffer::BufferUsageStreamRead:
  33                 usage = GL_STREAM_READ;
  34                 break;
  35         case GraphicsBuffer::BufferUsageStreamCopy:
  36                 usage = GL_STREAM_COPY;
  37                 break;
  38         default:
  39                 SDL_assert(false && "Unknown buffer usage type."); //WTF?
  40                 usage = GL_DYNAMIC_DRAW;
  41         }
  42         return usage;
  43 }
  44
  45 static GLenum BufferTypeToGLType(GraphicsBuffer::BufferType buffer_type)
  46 {
  47         switch (buffer_type)
  48         {
  49         case GraphicsBuffer::BufferTypeVertex:
  50                 return GL_ARRAY_BUFFER;
  51         case GraphicsBuffer::BufferTypeIndex:
  52                 return GL_ELEMENT_ARRAY_BUFFER;
  53         case GraphicsBuffer::BufferTypePixelPack:
  54                 return GL_PIXEL_PACK_BUFFER;
  55         case GraphicsBuffer::BufferTypePixelUnpack:
  56                 return GL_PIXEL_UNPACK_BUFFER;
  57         case GraphicsBuffer::BufferTypeUniform:
  58                 return GL_UNIFORM_BUFFER;
  59         case GraphicsBuffer::BufferTypeTexture:
  60                 return GL_TEXTURE_BUFFER;
  61         case GraphicsBuffer::BufferTypeDrawIndirect:
  62                 return GL_DRAW_INDIRECT_BUFFER;
  63         default:
  64                 return GL_COPY_READ_BUFFER;
  65         }
  66 }
  67
  68 GraphicsBuffer::GraphicsBuffer()
  69 {
  70         m_invalidated = true;
  71         m_map_pointer = NULL;
  72         m_buffer_size = 0;
  73         m_buffer_shape_dirty = true;
  74         m_buffer_handle = 0;
  75         m_buffer_usage = BufferUsageDynamicDraw;
  76         m_faking_map = false;
  77         m_name = "Unnamed Buffer";
  78         SetUsage(BufferUsageStaticDraw);
  79 }
  80
  81 GraphicsBuffer::~GraphicsBuffer()
  82 {
  83         if (m_map_pointer)
  84         {
  85                 UnMap();
  86         }
  87         glDeleteBuffers(1, &m_buffer_handle);
  88 }
  89
  90 void GraphicsBuffer::SetType(GraphicsBuffer::BufferType bufType)
  91 {
  92         m_buffer_type = bufType;
  93 }
  94
  95 void GraphicsBuffer::SetName(const char *name)
  96 {
  97         m_name = name;
  98 }
  99
 100 void GraphicsBuffer::SetUsage(GraphicsBuffer::BufferUsage bufUsage)
 101 {
 102         if (bufUsage != m_buffer_usage)
 103         {
 104                 m_buffer_usage = bufUsage;
 105                 m_buffer_shape_dirty = true;
 106         }
 107 }
 108
 109 void GraphicsBuffer::Invalidate()
 110 {
 111         m_invalidated = true;
 112         if (!m_buffer_shape_dirty)
 113         {
 114                 // Orphan the block of memory we're pointing to.
 115                 Upload(m_buffer_size, NULL);
 116         }
 117         // Apparently not supported.
 118         //glInvalidateBufferData(m_buffer_handle);
 119 }
 120
 121 bool GraphicsBuffer::RecreateBuffer(const void *data)
 122 {
 123         // If the buffer is not dirty, don't recreate it.
 124         if (!m_buffer_shape_dirty) return false;
 125         // If the buffer is mapped, don't recreate it.
 126         if (!m_faking_map && m_map_pointer) return false;
 127         // If the buffer has data in it we need, don't recreate it.
 128         if (!m_invalidated) return false;
 129         if (m_buffer_handle)
 130         {
 131                 glDeleteBuffers(1, &m_buffer_handle);
 132         }
 133         glGenBuffers(1, &m_buffer_handle);
 134         glObjectLabel(GL_BUFFER, m_buffer_handle, -1, m_name);
 135         m_buffer_shape_dirty = false;
 136         if (m_buffer_size)
 137                 Upload(m_buffer_size, data);
 138         return true;
 139 }
 140
 141 void* GraphicsBuffer::Map(bool read, bool write, bool invalidate)
 142 {
 143         GLbitfield access = ((read)?GL_MAP_READ_BIT:0) | ((write)?GL_MAP_WRITE_BIT:0) | ((invalidate)?GL_MAP_INVALIDATE_BUFFER_BIT:0);
 144         GLenum target = BufferTypeToGLType(m_buffer_type);
 145
 146         if (invalidate)
 147         {
 148                 m_invalidated = true;
 149
 150                 // Intel's Mesa driver does not rename the buffer when we map with GL_MAP_INVALIDATE_BUFFER_BIT,
 151                 // resulting in the CPU stalling waiting for rendering from the buffer to complete on the GPU.
 152                 // We manually force the buffer to be renamed here to avoid this.
 153                 m_buffer_shape_dirty = true;
 154         }
 155
 156         if (m_map_pointer)
 157                 Warn("Tried to map already mapped buffer!");
 158
 159
 160         if (!read && m_buffer_usage == BufferUsage::BufferUsageStaticDraw)
 161         {
 162                 m_map_pointer = malloc(m_buffer_size);
 163                 m_faking_map = true;
 164                 return m_map_pointer;
 165         }
 166
 167         RecreateBuffer();
 168
 169         Bind();
 170
 171         m_map_pointer = glMapBufferRange(target, 0, m_buffer_size, access);
 172
 173         return m_map_pointer;
 174 }
 175
 176 void* GraphicsBuffer::MapRange(int offset, int length, bool read, bool write, bool invalidate)
 177 {
 178         GLbitfield access = ((read)?GL_MAP_READ_BIT:0) | ((write)?GL_MAP_WRITE_BIT:0) | ((invalidate)?GL_MAP_INVALIDATE_RANGE_BIT:0);
 179         GLenum target = BufferTypeToGLType(m_buffer_type);
 180
 181         if (m_map_pointer)
 182                 Warn("Tried to map already mapped buffer!");
 183
 184         RecreateBuffer();
 185
 186         Bind();
 187
 188         m_map_pointer = glMapBufferRange(target, offset, length, access);
 189         return m_map_pointer;
 190 }
 191
 192 void GraphicsBuffer::UnMap()
 193 {
 194         GLenum target = BufferTypeToGLType(m_buffer_type);
 195
 196         // If we're not mapped, unmapping is a no-op.
 197         if (!m_map_pointer)
 198                 return;
 199
 200         if (m_faking_map)
 201         {
 202                 Upload(m_buffer_size, m_map_pointer);
 203                 free(m_map_pointer);
 204                 m_map_pointer = NULL;
 205                 m_invalidated = false;
 206                 m_faking_map = false;
 207                 return;
 208         }
 209
 210         Bind();
 211         glUnmapBuffer(target);
 212         m_map_pointer = NULL;
 213         m_invalidated = false;
 214 }
 215
 216 void GraphicsBuffer::Upload(size_t length, const void* data)
 217 {
 218         GLenum target = BufferTypeToGLType(m_buffer_type);
 219
 220         GLenum usage = BufferUsageToGLUsage(m_buffer_usage);
 221
 222         m_invalidated = true;
 223         m_buffer_size = length;
 224         if (!RecreateBuffer(data))
 225         {
 226                 Bind();
 227                 glBufferData(target, length, data, usage);
 228         }
 229         if (data != NULL)
 230                 m_invalidated = false;
 231 }
 232
 233 void GraphicsBuffer::UploadRange(size_t length, intptr_t offset, const void* data)
 234 {
 235         GLenum target = BufferTypeToGLType(m_buffer_type);
 236
 237         RecreateBuffer();
 238
 239         Bind();
 240         glBufferSubData(target, offset, length, data);
 241         m_invalidated = false;
 242 }
 243
 244 void GraphicsBuffer::Resize(size_t length)
 245 {
 246         if (m_invalidated)
 247         {
 248                 m_buffer_size = length;
 249         }
 250         else
 251         {
 252                 glPushDebugGroup(GL_DEBUG_SOURCE_APPLICATION, 0, -1, "Resizing buffer.");
 253                 glDebugMessageControl(GL_DONT_CARE, GL_DONT_CARE, GL_DEBUG_SEVERITY_HIGH, 0, NULL, GL_TRUE);
 254                 // Create a new buffer and copy the old data into it.
 255                 UnMap();
 256                 GLuint old_buffer = m_buffer_handle;
 257                 glGenBuffers(1, &m_buffer_handle);
 258                 Upload(length, NULL);
 259                 glBindBuffer(GL_COPY_READ_BUFFER, old_buffer);
 260                 glBindBuffer(GL_COPY_WRITE_BUFFER, m_buffer_handle);
 261                 glCopyBufferSubData(GL_COPY_READ_BUFFER, GL_COPY_WRITE_BUFFER, 0, 0, m_buffer_size);
 262                 glDeleteBuffers(1, &old_buffer);
 263                 m_buffer_size = length;
 264                 glPopDebugGroup();
 265         }
 266 }
 267
 268 void GraphicsBuffer::Bind() const
 269 {
 270         if (m_buffer_type == BufferTypeUniform)
 271                 glBindBufferBase(GL_UNIFORM_BUFFER, 0, m_buffer_handle);
 272         else
 273                 glBindBuffer(BufferTypeToGLType(m_buffer_type), m_buffer_handle);
 274 }
 275
 276 void GraphicsBuffer::BindRange(size_t start, size_t size) const
 277 {
 278         glBindBufferRange(BufferTypeToGLType(m_buffer_type), 0, m_buffer_handle, start, size);
 279 }