src/view.cpp

   1 #include "view.h"
   2 #include "bufferbuilder.h"
   3 #include "screen.h"
   4 #include "gl_core44.h"
   5
   6 #ifndef CONTROLPANEL_DISABLED
   7         #include "controlpanel.h"
   8 #endif //CONTROLPANEL_DISABLED
   9
  10
  11 #ifdef TRANSFORM_BEZIERS_TO_PATH
  12         #ifndef TRANSFORM_OBJECTS_NOT_VIEW
  13         //#error Cannot TRANSFORM_BEZIERS_TO_PATH _without_ TRANSFORM_OBJECTS_NOT_VIEW
  14         #endif
  15 #endif
  16
  17 using namespace IPDF;
  18 using namespace std;
  19
  20 /**
  21  * Constructs a view
  22  * Allocates memory for ObjectRenderers
  23  * @param document - The document to associate the View with
  24  * @param bounds - Initial bounds of the View
  25  * @param colour - Colour to use for rendering this view. TODO: Make sure this actually works, or just remove it
  26  */
  27 View::View(Document & document, Screen & screen, const VRect & bounds, const Colour & colour)
  28         : m_use_gpu_transform(USE_GPU_TRANSFORM), m_use_gpu_rendering(USE_GPU_RENDERING), m_bounds_dirty(true), m_buffer_dirty(true),
  29                 m_render_dirty(true), m_document(document), m_screen(screen), m_cached_display(), m_bounds(bounds), m_colour(colour), m_bounds_ubo(),
  30                 m_objbounds_vbo(), m_object_renderers(NUMBER_OF_OBJECT_TYPES), m_cpu_rendering_pixels(NULL),
  31                 m_perform_shading(USE_SHADING), m_show_bezier_bounds(false), m_show_bezier_type(false),
  32                 m_show_fill_points(false), m_show_fill_bounds(false), m_lazy_rendering(true)
  33 {
  34         Debug("View Created - Bounds => {%s}", m_bounds.Str().c_str());
  35
  36         screen.SetView(this); // oh dear...
  37
  38
  39
  40         // Create ObjectRenderers - new's match delete's in View::~View
  41         //TODO: Don't forget to put new renderers here or things will be segfaultastic
  42         if (screen.Valid())
  43         {
  44                 m_object_renderers[RECT_FILLED] = new RectFilledRenderer();
  45                 m_object_renderers[RECT_OUTLINE] = new RectOutlineRenderer();
  46                 m_object_renderers[CIRCLE_FILLED] = new CircleFilledRenderer();
  47                 m_object_renderers[BEZIER] = new BezierRenderer();
  48                 m_object_renderers[PATH] = new PathRenderer();
  49         }
  50         else
  51         {
  52                 for (int i = RECT_FILLED; i <= PATH; ++i)
  53                         m_object_renderers[i] = new FakeRenderer();
  54         }
  55
  56         // To add rendering for a new type of object;
  57         // 1. Add enum to ObjectType in ipdf.h
  58         // 2. Implement class inheriting from ObjectRenderer using that type in objectrenderer.h and objectrenderer.cpp
  59         // 3. Add it here
  60         // 4. Profit
  61
  62
  63 #ifndef QUADTREE_DISABLED
  64         m_quadtree_max_depth = 2;
  65         m_current_quadtree_node = document.GetQuadTree().root_id;
  66 #endif
  67 }
  68
  69 /**
  70  * Destroy a view
  71  * Frees memory used by ObjectRenderers
  72  */
  73 View::~View()
  74 {
  75         for (unsigned i = 0; i < m_object_renderers.size(); ++i)
  76         {
  77                 delete m_object_renderers[i]; // delete's match new's in constructor
  78         }
  79         m_object_renderers.clear();
  80         delete [] m_cpu_rendering_pixels;
  81 }
  82
  83 /**
  84  * Translate the view
  85  * @param x, y - Amount to translate
  86  */
  87 void View::Translate(Real x, Real y)
  88 {
  89         if (!m_use_gpu_transform)
  90                 m_buffer_dirty = true;
  91         m_bounds_dirty = true;
  92         #ifdef TRANSFORM_OBJECTS_NOT_VIEW
  93         ObjectType type = NUMBER_OF_OBJECT_TYPES;
  94                 #ifdef TRANSFORM_BEZIERS_TO_PATH
  95                         type = PATH;
  96                 #endif
  97         m_document.TranslateObjects(-x, -y, type);
  98         #endif
  99         m_bounds.x += m_bounds.w*VReal(x);
 100         m_bounds.y += m_bounds.h*VReal(y);
 101         //Debug("View Bounds => %s", m_bounds.Str().c_str());
 102
 103
 104 }
 105
 106 /**
 107  * Set View bounds
 108  * @param bounds - New bounds
 109  */
 110 void View::SetBounds(const Rect & bounds)
 111 {
 112         m_bounds.x = bounds.x;
 113         m_bounds.y = bounds.y;
 114         m_bounds.w = bounds.w;
 115         m_bounds.h = bounds.h;
 116         if (!m_use_gpu_transform)
 117                 m_buffer_dirty = true;
 118         m_bounds_dirty = true;
 119 }
 120
 121 /**
 122  * Scale the View at a point
 123  * @param x, y - Coordinates to scale at (eg: Mouse cursor position)
 124  * @param scale_amount - Amount to scale by
 125  */
 126 void View::ScaleAroundPoint(Real x, Real y, Real scale_amount)
 127 {
 128
 129         // (x0, y0, w, h) -> (x*w - (x*w - x0)*s, y*h - (y*h - y0)*s, w*s, h*s)
 130         // x and y are coordinates in the window
 131         // Convert to local coords.
 132         if (!m_use_gpu_transform)
 133                 m_buffer_dirty = true;
 134         m_bounds_dirty = true;
 135
 136
 137         #ifdef TRANSFORM_OBJECTS_NOT_VIEW
 138         ObjectType type = NUMBER_OF_OBJECT_TYPES;
 139         #ifdef TRANSFORM_BEZIERS_TO_PATH
 140                 type = PATH;
 141         #endif
 142         m_document.ScaleObjectsAboutPoint(x, y, scale_amount, type);
 143         #endif
 144         VReal vx = m_bounds.w * VReal(x);
 145         VReal vy = m_bounds.h * VReal(y);
 146         vx += m_bounds.x;
 147         vy += m_bounds.y;
 148
 149         VReal top = vy - m_bounds.y;
 150         VReal left = vx - m_bounds.x;
 151
 152         top *= scale_amount;
 153         left *= scale_amount;
 154
 155         m_bounds.x = vx - left;
 156         m_bounds.y = vy - top;
 157         m_bounds.w *= scale_amount;
 158         m_bounds.h *= scale_amount;
 159         //Debug("Scale at {%s, %s} by %s View Bounds => %s", x.Str().c_str(), y.Str().c_str(), scale_amount.Str().c_str(), m_bounds.Str().c_str());
 160
 161
 162 }
 163
 164 /**
 165  * Transform a point in the document to a point relative to the top left corner of the view
 166  * This is the CPU coordinate transform code; used only if the CPU is doing coordinate transforms
 167  * @param inp - Input Rect {x,y,w,h} in the document
 168  * @returns output Rect {x,y,w,h} in the View
 169  */
 170 Rect View::TransformToViewCoords(const Rect& inp) const
 171 {
 172         #ifdef TRANSFORM_OBJECTS_NOT_VIEW
 173                 return inp;
 174         #endif
 175         return TransformRectCoordinates(m_bounds.Convert<Real>(), inp);
 176 }
 177
 178 /**
 179  * Render the view
 180  * Updates FrameBuffer if the document, object bounds, or view bounds have changed, then Blits it
 181  * Otherwise just Blits the cached FrameBuffer
 182  * @param width - Width of View to render
 183  * @param height - Height of View to render
 184  */
 185 void View::Render(int width, int height)
 186 {
 187         if (!m_screen.Valid()) return;
 188         glPushDebugGroup(GL_DEBUG_SOURCE_APPLICATION,42,-1, "Beginning View::Render()");
 189         // View dimensions have changed (ie: Window was resized)
 190         int prev_width = m_cached_display.GetWidth();
 191         int prev_height = m_cached_display.GetHeight();
 192         if (width != prev_width || height != prev_height)
 193         {
 194                 m_cached_display.Create(width, height);
 195                 m_bounds_dirty = true;
 196         }
 197
 198         // View bounds have not changed; blit the FrameBuffer as it is
 199         if (!m_bounds_dirty && m_lazy_rendering)
 200         {
 201                 m_cached_display.UnBind();
 202                 m_cached_display.Blit();
 203                 glPopDebugGroup();
 204                 return;
 205         }
 206         m_cached_display.Bind(); //NOTE: This is redundant; Clear already calls Bind
 207         m_cached_display.Clear();
 208
 209 #ifndef QUADTREE_DISABLED
 210         // I'm going to write this out in comments, so hopefully then I'll understand it. :/
 211         //
 212         // This code looks at the current bounds and tries to work out how they need to change
 213         // to keep the view looking at the correct quadtree node.
 214         //
 215         // The idea is that the width/height of the view bounds are always 0.5<=wh<=1.0. We then always
 216         // try to keep the bottom-right corner of the node on-screen, changing nodes to suit. Why bottom-right,
 217         // you may ask. It's an excellent question, with a dubious, hand-wavey answer: because we're manipulating
 218         // the bounds, it was easier to do it that way. (The top-left corner of the bounds are within the main
 219         // quadtree node).
 220         if (m_bounds_dirty || !m_lazy_rendering)
 221         {
 222                 // If we're too far zoomed out, become the parent of the current node.
 223                 if ( m_bounds.w > 1.0 || m_bounds.h > 1.0)
 224                 {
 225                         // If a parent node exists, we'll become it.
 226                         //TODO: Generate a new parent node if none exists, and work out when to change child_type
 227                         // away from QTC_UNKNOWN
 228                         if (m_document.GetQuadTree().nodes[m_current_quadtree_node].parent != QUADTREE_EMPTY)
 229                         {
 230                                 m_bounds = TransformFromQuadChild(m_bounds, m_document.GetQuadTree().nodes[m_current_quadtree_node].child_type);
 231                                 m_current_quadtree_node = m_document.GetQuadTree().nodes[m_current_quadtree_node].parent;
 232                         }
 233                 }
 234
 235                 // If we have a parent... (This prevents some crashes, but should disappear.)
 236                 if (m_document.GetQuadTree().nodes[m_current_quadtree_node].parent != QUADTREE_EMPTY)
 237                 {
 238                         // If the current node is off the left-hand side of the screen...
 239                         while (m_bounds.x > 1)
 240                         {
 241                                 //... the current node becomes the node to its right.
 242                                 m_bounds = Rect(m_bounds.x - 1, m_bounds.y, m_bounds.w, m_bounds.h);
 243                                 m_current_quadtree_node = m_document.GetQuadTree().GetNeighbour(m_current_quadtree_node, 1, 0, &m_document);
 244                         }
 245                         while (m_bounds.y > 1)
 246                         {
 247                                 m_bounds = Rect(m_bounds.x, m_bounds.y - 1, m_bounds.w, m_bounds.h);
 248                                 m_current_quadtree_node = m_document.GetQuadTree().GetNeighbour(m_current_quadtree_node, 0, 1, &m_document);
 249                         }
 250                         while (m_bounds.x < 0)
 251                         {
 252                                 m_bounds = Rect(m_bounds.x + 1, m_bounds.y, m_bounds.w, m_bounds.h);
 253                                 m_current_quadtree_node = m_document.GetQuadTree().GetNeighbour(m_current_quadtree_node, -1, 0, &m_document);
 254                         }
 255                         while (m_bounds.y < 0)
 256                         {
 257                                 m_bounds = Rect(m_bounds.x, m_bounds.y + 1, m_bounds.w, m_bounds.h);
 258                                 m_current_quadtree_node = m_document.GetQuadTree().GetNeighbour(m_current_quadtree_node, 0, -1, &m_document);
 259                         }
 260                 }
 261
 262                 // Recurse into a node if we are completely within it. (If we're okay with having an invalid frame or two, we can remove this.)
 263                 if (ContainedInQuadChild(m_bounds, QTC_TOP_LEFT))
 264                 {
 265                         if (m_document.GetQuadTree().nodes[m_current_quadtree_node].top_left == QUADTREE_EMPTY)
 266                         {
 267                                 // We want to reparent into a child node, but none exist. Get the document to create one.
 268                                 m_document.GenQuadChild(m_current_quadtree_node, QTC_TOP_LEFT);
 269                                 m_render_dirty = true;
 270                         }
 271                         m_bounds = TransformToQuadChild(m_bounds, QTC_TOP_LEFT);
 272                         m_current_quadtree_node = m_document.GetQuadTree().nodes[m_current_quadtree_node].top_left;
 273                 }
 274                 if (ContainedInQuadChild(m_bounds, QTC_TOP_RIGHT))
 275                 {
 276                         if (m_document.GetQuadTree().nodes[m_current_quadtree_node].top_right == QUADTREE_EMPTY)
 277                         {
 278                                 // We want to reparent into a child node, but none exist. Get the document to create one.
 279                                 m_document.GenQuadChild(m_current_quadtree_node, QTC_TOP_RIGHT);
 280                                 m_render_dirty = true;
 281                         }
 282                         m_bounds = TransformToQuadChild(m_bounds, QTC_TOP_RIGHT);
 283                         m_current_quadtree_node = m_document.GetQuadTree().nodes[m_current_quadtree_node].top_right;
 284                 }
 285                 if (ContainedInQuadChild(m_bounds, QTC_BOTTOM_LEFT))
 286                 {
 287                         if (m_document.GetQuadTree().nodes[m_current_quadtree_node].bottom_left == QUADTREE_EMPTY)
 288                         {
 289                                 // We want to reparent into a child node, but none exist. Get the document to create one.
 290                                 m_document.GenQuadChild(m_current_quadtree_node, QTC_BOTTOM_LEFT);
 291                                 m_render_dirty = true;
 292                         }
 293                         m_bounds = TransformToQuadChild(m_bounds, QTC_BOTTOM_LEFT);
 294                         m_current_quadtree_node = m_document.GetQuadTree().nodes[m_current_quadtree_node].bottom_left;
 295                 }
 296                 if (ContainedInQuadChild(m_bounds, QTC_BOTTOM_RIGHT))
 297                 {
 298                         if (m_document.GetQuadTree().nodes[m_current_quadtree_node].bottom_right == QUADTREE_EMPTY)
 299                         {
 300                                 // We want to reparent into a child node, but none exist. Get the document to create one.
 301                                 m_document.GenQuadChild(m_current_quadtree_node, QTC_BOTTOM_RIGHT);
 302                                 m_render_dirty = true;
 303                         }
 304                         m_bounds = TransformToQuadChild(m_bounds, QTC_BOTTOM_RIGHT);
 305                         m_current_quadtree_node = m_document.GetQuadTree().nodes[m_current_quadtree_node].bottom_right;
 306                 }
 307
 308                 // Otherwise, we'll arbitrarily select the bottom-right.
 309                 // TODO: Perhaps select based on greatest area?
 310                 if (m_bounds.w < 0.5 || m_bounds.h < 0.5)
 311                 {
 312                         if (m_document.GetQuadTree().nodes[m_current_quadtree_node].bottom_right == QUADTREE_EMPTY)
 313                         {
 314                                 // We want to reparent into a child node, but none exist. Get the document to create one.
 315                                 m_document.GenQuadChild(m_current_quadtree_node, QTC_BOTTOM_RIGHT);
 316                                 m_render_dirty = true;
 317                         }
 318                         m_bounds = TransformToQuadChild(m_bounds, QTC_BOTTOM_RIGHT);
 319                         m_current_quadtree_node = m_document.GetQuadTree().nodes[m_current_quadtree_node].bottom_right;
 320                 }
 321         }
 322
 323         m_screen.DebugFontPrintF("Current View QuadTree");
 324         QuadTreeIndex overlay = m_current_quadtree_node;
 325         while (overlay != -1)
 326         {
 327                 m_screen.DebugFontPrintF(" Node: %d (objs: %d -> %d)", overlay, m_document.GetQuadTree().nodes[overlay].object_begin,
 328                                         m_document.GetQuadTree().nodes[overlay].object_end);
 329                 overlay = m_document.GetQuadTree().nodes[overlay].next_overlay;
 330         }
 331         m_screen.DebugFontPrintF("\n");
 332         m_screen.DebugFontPrintF("Left: %d, Right: %d, Up: %d, Down: %d\n",
 333                         m_document.GetQuadTree().GetNeighbour(m_current_quadtree_node, -1, 0, 0),
 334                         m_document.GetQuadTree().GetNeighbour(m_current_quadtree_node, 1, 0, 0),
 335                         m_document.GetQuadTree().GetNeighbour(m_current_quadtree_node, 0, -1, 0),
 336                         m_document.GetQuadTree().GetNeighbour(m_current_quadtree_node, 0, 1, 0));
 337
 338
 339         Rect view_top_bounds = m_bounds;
 340         QuadTreeIndex tmp = m_current_quadtree_node;
 341         while (tmp != -1)
 342         {
 343                 view_top_bounds = TransformFromQuadChild(view_top_bounds, m_document.GetQuadTree().nodes[tmp].child_type);
 344                 tmp = m_document.GetQuadTree().nodes[tmp].parent;
 345         }
 346         m_screen.DebugFontPrintF("Equivalent View Bounds: %s\n", view_top_bounds.Str().c_str());
 347 #endif
 348
 349         if (!m_use_gpu_rendering)
 350         {
 351                 // Dynamically resize CPU rendering target pixels if needed
 352                 if (m_cpu_rendering_pixels == NULL || width*height > prev_width*prev_height)
 353                 {
 354                         delete [] m_cpu_rendering_pixels;
 355                         m_cpu_rendering_pixels = new uint8_t[width*height*4];
 356                         if (m_cpu_rendering_pixels == NULL)
 357                                 Fatal("Could not allocate %d*%d*4 = %d bytes for cpu rendered pixels", width, height, width*height*4);
 358                 }
 359                 // Clear CPU rendering pixels
 360                 for (int i = 0; i < width*height*4; ++i)
 361                         m_cpu_rendering_pixels[i] = 255;
 362         }
 363 #ifdef QUADTREE_DISABLED
 364         RenderRange(width, height, 0, m_document.ObjectCount());
 365 #else
 366         RenderQuadtreeNode(width, height, m_current_quadtree_node, m_quadtree_max_depth);
 367 #endif
 368         if (!m_use_gpu_rendering)
 369         {
 370                 m_screen.RenderPixels(0,0,width, height, m_cpu_rendering_pixels); //TODO: Make this work :(
 371                 // Debug for great victory (do something similar for GPU and compare?)
 372                 //ObjectRenderer::SaveBMP({m_cpu_rendering_pixels, width, height}, "cpu_rendering_last_frame.bmp");
 373         }
 374         m_cached_display.UnBind(); // resets render target to the screen
 375         m_cached_display.Blit(); // blit FrameBuffer to screen
 376         m_buffer_dirty = false;
 377         glPopDebugGroup();
 378
 379 #ifndef CONTROLPANEL_DISABLED
 380         // The powers that be suggest that this may be causing of the segfaults.
 381         //ControlPanel::Update();
 382 #endif //CONTROLPANEL_DISABLED
 383         //Debug("Completed Render");
 384
 385 }
 386
 387 #ifndef QUADTREE_DISABLED
 388 void View::RenderQuadtreeNode(int width, int height, QuadTreeIndex node, int remaining_depth)
 389 {
 390         Rect old_bounds = m_bounds;
 391         if (node == QUADTREE_EMPTY) return;
 392         if (!remaining_depth) return;
 393         //Debug("Rendering QT node %d, (objs: %d -- %d)\n", node, m_document.GetQuadTree().nodes[node].object_begin, m_document.GetQuadTree().nodes[node].object_end);
 394         m_bounds_dirty = true;
 395         m_render_dirty = m_buffer_dirty = true;
 396         QuadTreeIndex overlay = node;
 397         while(overlay != -1)
 398         {
 399                 RenderRange(width, height, m_document.GetQuadTree().nodes[overlay].object_begin, m_document.GetQuadTree().nodes[overlay].object_end);
 400                 overlay = m_document.GetQuadTree().nodes[overlay].next_overlay;
 401         }
 402
 403         if (m_bounds.Intersects(Rect(1,1,1,1)))
 404         {
 405                 m_bounds = Rect(m_bounds.x - 1, m_bounds.y - 1, m_bounds.w, m_bounds.h);
 406                 m_bounds_dirty = true;
 407                 RenderQuadtreeNode(width, height, m_document.GetQuadTree().GetNeighbour(node, 1, 1, &m_document), remaining_depth - 1);
 408         }
 409         m_bounds = old_bounds;
 410         if (m_bounds.Intersects(Rect(1,0,1,1)))
 411         {
 412                 m_bounds = Rect(m_bounds.x - 1, m_bounds.y, m_bounds.w, m_bounds.h);
 413                 m_bounds_dirty = true;
 414                 RenderQuadtreeNode(width, height, m_document.GetQuadTree().GetNeighbour(node, 1, 0, &m_document), remaining_depth - 1);
 415         }
 416         m_bounds = old_bounds;
 417         if (m_bounds.Intersects(Rect(0,1,1,1)))
 418         {
 419                 m_bounds = Rect(m_bounds.x, m_bounds.y - 1, m_bounds.w, m_bounds.h);
 420                 m_bounds_dirty = true;
 421                 RenderQuadtreeNode(width, height, m_document.GetQuadTree().GetNeighbour(node, 0, 1, &m_document), remaining_depth - 1);
 422         }
 423         m_bounds = old_bounds;
 424         m_bounds_dirty = true;
 425
 426 #if 0
 427         m_bounds = TransformToQuadChild(old_bounds, QTC_TOP_LEFT);
 428         m_bounds_dirty = true;
 429         RenderQuadtreeNode(width, height, m_document.GetQuadTree().nodes[node].top_left, remaining_depth-1);
 430         m_bounds = TransformToQuadChild(old_bounds, QTC_TOP_RIGHT);
 431         m_bounds_dirty = true;
 432         RenderQuadtreeNode(width, height, m_document.GetQuadTree().nodes[node].top_right, remaining_depth-1);
 433         m_bounds = TransformToQuadChild(old_bounds, QTC_BOTTOM_LEFT);
 434         m_bounds_dirty = true;
 435         RenderQuadtreeNode(width, height, m_document.GetQuadTree().nodes[node].bottom_left, remaining_depth-1);
 436         m_bounds = TransformToQuadChild(old_bounds, QTC_BOTTOM_RIGHT);
 437         m_bounds_dirty = true;
 438         RenderQuadtreeNode(width, height, m_document.GetQuadTree().nodes[node].bottom_right, remaining_depth-1);
 439         m_bounds = old_bounds;
 440         m_bounds_dirty = true;
 441 #endif
 442 }
 443 #endif
 444
 445 void View::RenderRange(int width, int height, unsigned first_obj, unsigned last_obj)
 446 {
 447         glPushDebugGroup(GL_DEBUG_SOURCE_APPLICATION, 43, -1, "View::RenderRange()");
 448         if (m_render_dirty) // document has changed
 449                 PrepareRender();
 450
 451         if (m_buffer_dirty || m_bounds_dirty || !m_lazy_rendering) // object bounds have changed
 452         {
 453                 if (m_use_gpu_rendering)
 454                         UpdateObjBoundsVBO(first_obj, last_obj);
 455         }
 456
 457         if (m_use_gpu_transform)
 458         {
 459                 #ifdef TRANSFORM_OBJECTS_NOT_VIEW
 460                         //Debug("Transform objects, not view");
 461                                 GLfloat glbounds[] = {0.0f, 0.0f, 1.0f, 1.0f,
 462                                         0.0f, 0.0f, float(width), float(height)};
 463                 #else
 464                 GLfloat glbounds[] = {static_cast<GLfloat>(Float(m_bounds.x)), static_cast<GLfloat>(Float(m_bounds.y)), static_cast<GLfloat>(Float(m_bounds.w)), static_cast<GLfloat>(Float(m_bounds.h)),
 465                                         0.0, 0.0, static_cast<GLfloat>(width), static_cast<GLfloat>(height)};
 466                 #endif
 467                 m_bounds_ubo.Upload(sizeof(float)*8, glbounds);
 468         }
 469         else
 470         {
 471                 GLfloat glbounds[] = {0.0f, 0.0f, 1.0f, 1.0f,
 472                                         0.0f, 0.0f, float(width), float(height)};
 473                 m_bounds_ubo.Upload(sizeof(float)*8, glbounds);
 474         }
 475         m_bounds_dirty = false;
 476
 477
 478         // Render using GPU
 479         if (m_use_gpu_rendering)
 480         {
 481                 if (m_colour.a < 1.0f)
 482                 {
 483                         glEnable(GL_BLEND);
 484                         glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 485                 }
 486                 m_objbounds_vbo.Bind();
 487                 m_bounds_ubo.Bind();
 488                 glEnableVertexAttribArray(0);
 489                 glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 0, 0);
 490
 491                 for (unsigned i = 0; i < m_object_renderers.size(); ++i)
 492                 {
 493                         m_object_renderers[i]->RenderUsingGPU(first_obj, last_obj);
 494                 }
 495
 496                 glDisableVertexAttribArray(0);
 497                 if (m_colour.a < 1.0f)
 498                 {
 499                         glDisable(GL_BLEND);
 500                 }
 501         }
 502         else // Rasterise on CPU then blit texture to GPU
 503         {
 504
 505                 for (unsigned i = 0; i < m_object_renderers.size(); ++i)
 506                 {
 507                         m_object_renderers[i]->RenderUsingCPU(m_document.m_objects, *this, {m_cpu_rendering_pixels, width, height}, first_obj, last_obj);
 508                 }
 509         }
 510         glPopDebugGroup();
 511 }
 512
 513 void View::UpdateObjBoundsVBO(unsigned first_obj, unsigned last_obj)
 514 {
 515         //m_objbounds_vbo.Invalidate();
 516         m_objbounds_vbo.SetType(GraphicsBuffer::BufferTypeVertex);
 517         m_objbounds_vbo.SetName("Object Bounds VBO");
 518
 519         #ifndef TRANSFORM_OBJECTS_NOT_VIEW
 520         if (m_use_gpu_transform)
 521         {
 522                 m_objbounds_vbo.SetUsage(GraphicsBuffer::BufferUsageStaticDraw);
 523         }
 524         else
 525         #endif //TRANSFORM_OBJECTS_NOT_VIEW
 526         {
 527                 m_objbounds_vbo.SetUsage(GraphicsBuffer::BufferUsageDynamicCopy);
 528         }
 529         m_objbounds_vbo.Resize(m_document.ObjectCount()*sizeof(GPUObjBounds));
 530
 531         BufferBuilder<GPUObjBounds> obj_bounds_builder(m_objbounds_vbo.MapRange(first_obj*sizeof(GPUObjBounds), (last_obj-first_obj)*sizeof(GPUObjBounds), false, true, true), m_objbounds_vbo.GetSize());
 532
 533         #ifndef TRANSFORM_BEZIERS_TO_PATH
 534         for (unsigned id = first_obj; id < last_obj; ++id)
 535         {
 536                 Rect obj_bounds;
 537                 if (m_use_gpu_transform)
 538                 {
 539                         obj_bounds = m_document.m_objects.bounds[id];
 540                 }
 541                 else
 542                 {
 543                         obj_bounds = TransformToViewCoords(m_document.m_objects.bounds[id]);
 544                 }
 545                 GPUObjBounds gpu_bounds = {
 546                         Float(obj_bounds.x),
 547                         Float(obj_bounds.y),
 548                         Float(obj_bounds.x + obj_bounds.w),
 549                         Float(obj_bounds.y + obj_bounds.h)
 550                 };
 551
 552                 obj_bounds_builder.Add(gpu_bounds);
 553         }
 554         #else
 555         for (unsigned i = 0; i < m_document.m_objects.paths.size(); ++i)
 556         {
 557                 Path & path = m_document.m_objects.paths[i];
 558                 Rect & pbounds = path.GetBounds(m_document.m_objects); // Not very efficient...
 559                 for (unsigned id = path.m_start; id <= path.m_end; ++id)
 560                 {
 561                         if (id < first_obj || id >= last_obj)
 562                                 continue;
 563
 564                         Rect obj_bounds = m_document.m_objects.bounds[id];
 565
 566                         obj_bounds.x *= pbounds.w;
 567                         obj_bounds.x += pbounds.x;
 568                         obj_bounds.y *= pbounds.h;
 569                         obj_bounds.y += pbounds.y;
 570                         obj_bounds.w *= pbounds.w;
 571                         obj_bounds.h *= pbounds.h;
 572
 573                         if (!m_use_gpu_transform)
 574                                 obj_bounds = TransformToViewCoords(obj_bounds);
 575                         GPUObjBounds gpu_bounds = {
 576                                 ClampFloat(obj_bounds.x),
 577                                 ClampFloat(obj_bounds.y),
 578                                 ClampFloat(obj_bounds.x + obj_bounds.w),
 579                                 ClampFloat(obj_bounds.y + obj_bounds.h)
 580                         };
 581                         obj_bounds_builder.Add(gpu_bounds);
 582                         //Debug("Path %d %s -> %s via %s", id, m_document.m_objects.bounds[id].Str().c_str(), obj_bounds.Str().c_str(), pbounds.Str().c_str());
 583                 }
 584                 GPUObjBounds p_gpu_bounds = {
 585                                 ClampFloat(pbounds.x),
 586                                 ClampFloat(pbounds.y),
 587                                 ClampFloat(pbounds.x + pbounds.w),
 588                                 ClampFloat(pbounds.y + pbounds.h)
 589                 };
 590                 obj_bounds_builder.Add(p_gpu_bounds);
 591         }
 592         #endif
 593         m_objbounds_vbo.UnMap();
 594 }
 595 /**
 596  * Prepare the document for rendering
 597  * Will be called on View::Render if m_render_dirty is set
 598  * (Called at least once, on the first Render)
 599  */
 600 void View::PrepareRender()
 601 {
 602         Debug("Recreate buffers with %u objects", m_document.ObjectCount());
 603         // Prepare bounds vbo
 604         if (UsingGPURendering())
 605         {
 606                 m_bounds_ubo.Invalidate();
 607                 m_bounds_ubo.SetType(GraphicsBuffer::BufferTypeUniform);
 608                 m_bounds_ubo.SetUsage(GraphicsBuffer::BufferUsageStreamDraw);
 609                 m_bounds_ubo.SetName("m_bounds_ubo: Screen bounds.");
 610         }
 611
 612         // Instead of having each ObjectRenderer go through the whole document
 613         //  we initialise them, go through the document once adding to the appropriate Renderers
 614         //  and then finalise them
 615         // This will totally be efficient if we have like, a lot of distinct ObjectTypes. Which could totally happen. You never know.
 616
 617         // Prepare the buffers
 618         for (unsigned i = 0; i < m_object_renderers.size(); ++i)
 619         {
 620                 m_object_renderers[i]->PrepareBuffers(m_document.ObjectCount());
 621         }
 622
 623         // Add objects from Document to buffers
 624         for (unsigned id = 0; id < m_document.ObjectCount(); ++id)
 625         {
 626                 ObjectType type = m_document.m_objects.types[id];
 627                 m_object_renderers.at(type)->AddObjectToBuffers(id); // Use at() in case the document is corrupt TODO: Better error handling?
 628                 // (Also, Wow I just actually used std::vector::at())
 629                 // (Also, I just managed to make it throw an exception because I'm a moron)
 630                 //Debug("Object of type %d", type);
 631         }
 632
 633
 634         // Finish the buffers
 635         for (unsigned i = 0; i < m_object_renderers.size(); ++i)
 636         {
 637                 m_object_renderers[i]->FinaliseBuffers();
 638         }
 639         if (UsingGPURendering())
 640         {
 641                 dynamic_cast<BezierRenderer*>(m_object_renderers[BEZIER])->PrepareBezierGPUBuffer(m_document.m_objects);
 642         }
 643         m_render_dirty = false;
 644 }
 645
 646 void View::SaveCPUBMP(const char * filename)
 647 {
 648         bool prev = UsingGPURendering();
 649         SetGPURendering(false);
 650         Render(800, 600);
 651         ObjectRenderer::SaveBMP({m_cpu_rendering_pixels, 800, 600}, filename);
 652         SetGPURendering(prev);
 653 }
 654
 655 void View::SaveGPUBMP(const char * filename)
 656 {
 657         bool prev = UsingGPURendering();
 658         SetGPURendering(true);
 659         Render(800,600);
 660         m_screen.ScreenShot(filename);
 661         SetGPURendering(prev);
 662 }