src/objectrenderer.cpp

   1 /**
   2  * @file objectrenderer.cpp
   3  * @brief Implements ObjectRenderer and derived classes
   4  */
   5
   6 #include "objectrenderer.h"
   7 #include "view.h"
   8 #include <vector>
   9
  10 using namespace std;
  11
  12 namespace IPDF
  13 {
  14
  15 /**
  16  * ObjectRenderer constructor
  17  * Note we cannot compile the shaders in the ShaderProgram constructor
  18  *  because the Screen class needs to initialise GL first and it has a
  19  *      ShaderProgram member
  20  */
  21 ObjectRenderer::ObjectRenderer(const ObjectType & type,
  22                 const char * vert_glsl_file, const char * frag_glsl_file, const char * geom_glsl_file)
  23                 : m_type(type), m_shader_program(), m_indexes(), m_buffer_builder(NULL)
  24 {
  25         m_shader_program.InitialiseShaders(vert_glsl_file, frag_glsl_file, geom_glsl_file);
  26         m_shader_program.Use();
  27         glUniform4f(m_shader_program.GetUniformLocation("colour"), 0,0,0,1); //TODO: Allow different colours
  28 }
  29
  30 /**
  31  * Render using GPU
  32  */
  33 void ObjectRenderer::RenderUsingGPU(unsigned first_obj_id, unsigned last_obj_id)
  34 {
  35         // If we don't have anything to render, return.
  36         if (first_obj_id == last_obj_id) return;
  37         // If there are no objects of this type, return.
  38         if (m_indexes.empty()) return;
  39         unsigned first_index = 0;
  40         while (m_indexes.size() > first_index && m_indexes[first_index] < first_obj_id) first_index ++;
  41         unsigned last_index = first_index;
  42         while (m_indexes.size() > last_index && m_indexes[last_index] < last_obj_id) last_index ++;
  43
  44         m_shader_program.Use();
  45         m_ibo.Bind();
  46         glDrawElements(GL_LINES, (last_index-first_index)*2, GL_UNSIGNED_INT, (GLvoid*)(2*first_index*sizeof(uint32_t)));
  47 }
  48
  49
  50 /**
  51  * Default implementation for rendering using CPU
  52  */
  53 void ObjectRenderer::RenderUsingCPU(const Objects & objects, const View & view, const CPURenderTarget & target, unsigned first_obj_id, unsigned last_obj_id)
  54 {
  55         Error("Cannot render objects of type %d on CPU", m_type);
  56         //TODO: Render a rect or something instead?
  57 }
  58
  59 /**
  60  * Prepare index buffers for both CPU and GPU rendering to receive indexes (but don't add any yet!)
  61  */
  62 void ObjectRenderer::PrepareBuffers(unsigned max_objects)
  63 {
  64         if (m_buffer_builder != NULL) // We already have a BufferBuilder
  65         {
  66                 Fatal("Has been called before, without FinaliseBuffers being called since!");
  67         }
  68         // Empty and reserve the indexes vector (for CPU rendering)
  69         m_indexes.clear();
  70         m_indexes.reserve(max_objects); //TODO: Can probably make this smaller? Or leave it out? Do we care?
  71
  72         // Initialise and resize the ibo (for GPU rendering)
  73         m_ibo.Invalidate();
  74         m_ibo.SetUsage(GraphicsBuffer::BufferUsageStaticDraw);
  75         m_ibo.SetType(GraphicsBuffer::BufferTypeIndex);
  76         m_ibo.Resize(max_objects * 2 * sizeof(uint32_t));
  77         // BufferBuilder is used to construct the ibo
  78         m_buffer_builder = new BufferBuilder<uint32_t>(m_ibo.Map(false, true, true), m_ibo.GetSize()); // new matches delete in ObjectRenderer::FinaliseBuffers
  79
  80 }
  81
  82 /**
  83  * Add object index to the buffers for CPU and GPU rendering
  84  */
  85 void ObjectRenderer::AddObjectToBuffers(unsigned index)
  86 {
  87         if (m_buffer_builder == NULL) // No BufferBuilder!
  88         {
  89                 Fatal("Called without calling PrepareBuffers");
  90         }
  91         m_buffer_builder->Add(2*index); // ibo for GPU rendering
  92         m_buffer_builder->Add(2*index+1);
  93         m_indexes.push_back(index); // std::vector of indices for CPU rendering
  94 }
  95
  96 /**
  97  * Finalise the index buffers for CPU and GPU rendering
  98  */
  99 void ObjectRenderer::FinaliseBuffers()
 100 {
 101         if (m_buffer_builder == NULL) // No BufferBuilder!
 102         {
 103                 Fatal("Called without calling PrepareBuffers");
 104         }
 105         // For GPU rendering, UnMap the ibo
 106         m_ibo.UnMap();
 107         // ... and delete the BufferBuilder used to create it
 108         delete m_buffer_builder; // delete matches new in ObjectRenderer::PrepareBuffers
 109         m_buffer_builder = NULL;
 110
 111         // Nothing is necessary for CPU rendering
 112 }
 113
 114
 115 /**
 116  * Rectangle (filled)
 117  */
 118 void RectFilledRenderer::RenderUsingCPU(const Objects & objects, const View & view, const CPURenderTarget & target, unsigned first_obj_id, unsigned last_obj_id)
 119 {
 120         for (unsigned i = 0; i < m_indexes.size(); ++i)
 121         {
 122                 if (m_indexes[i] < first_obj_id) continue;
 123                 if (m_indexes[i] >= last_obj_id) continue;
 124                 PixelBounds bounds(CPURenderBounds(objects.bounds[m_indexes[i]], view, target));
 125                 FloodFillOnCPU(bounds.x+1, bounds.y+1, bounds, target, Colour(0,0,0,1));
 126                 /*
 127                 for (int64_t x = max((int64_t)0, bounds.x); x <= min(bounds.x+bounds.w, target.w-1); ++x)
 128                 {
 129                         for (int64_t y = max((int64_t)0, bounds.y); y <= min(bounds.y+bounds.h, target.h-1); ++y)
 130                         {
 131                                 int index = (x+target.w*y)*4;
 132                                 target.pixels[index+0] = 0;
 133                                 target.pixels[index+1] = 0;
 134                                 target.pixels[index+2] = 0;
 135                                 target.pixels[index+3] = 255;
 136                         }
 137                 }
 138                 */
 139         }
 140 }
 141
 142 /**
 143  * Rectangle (outine)
 144  */
 145 void RectOutlineRenderer::RenderUsingCPU(const Objects & objects, const View & view, const CPURenderTarget & target, unsigned first_obj_id, unsigned last_obj_id)
 146 {
 147         //Debug("Render %u outlined rectangles on CPU", m_indexes.size());
 148         for (unsigned i = 0; i < m_indexes.size(); ++i)
 149         {
 150                 if (m_indexes[i] < first_obj_id) continue;
 151                 if (m_indexes[i] >= last_obj_id) continue;
 152                 PixelBounds bounds(CPURenderBounds(objects.bounds[m_indexes[i]], view, target));
 153
 154                 // Using bresenham's lines now mainly because I want to see if they work
 155                 // top
 156                 ObjectRenderer::RenderLineOnCPU(bounds.x, bounds.y, bounds.x+bounds.w, bounds.y, target);
 157                 // bottom
 158                 ObjectRenderer::RenderLineOnCPU(bounds.x, bounds.y+bounds.h, bounds.x+bounds.w, bounds.y+bounds.h, target);
 159                 // left
 160                 ObjectRenderer::RenderLineOnCPU(bounds.x, bounds.y, bounds.x, bounds.y+bounds.h, target);
 161                 // right
 162                 ObjectRenderer::RenderLineOnCPU(bounds.x+bounds.w, bounds.y, bounds.x+bounds.w, bounds.y+bounds.h, target);
 163
 164                 // Diagonal for testing (from bottom left to top right)
 165                 //ObjectRenderer::RenderLineOnCPU(bounds.x,bounds.y+bounds.h, bounds.x+bounds.w, bounds.y,target, C_BLUE);
 166                 //ObjectRenderer::RenderLineOnCPU(bounds.x+bounds.w, bounds.y+bounds.h, bounds.x, bounds.y, target,C_GREEN);
 167         }
 168 }
 169
 170 /**
 171  * Circle (filled)
 172  */
 173 void CircleFilledRenderer::RenderUsingCPU(const Objects & objects, const View & view, const CPURenderTarget & target, unsigned first_obj_id, unsigned last_obj_id)
 174 {
 175         for (unsigned i = 0; i < m_indexes.size(); ++i)
 176         {
 177                 if (m_indexes[i] < first_obj_id) continue;
 178                 if (m_indexes[i] >= last_obj_id) continue;
 179                 PixelBounds bounds(CPURenderBounds(objects.bounds[m_indexes[i]], view, target));
 180                 int64_t centre_x = bounds.x + bounds.w / 2;
 181                 int64_t centre_y = bounds.y + bounds.h / 2;
 182
 183                 //Debug("Centre is %d, %d", centre_x, centre_y);
 184                 //Debug("Bounds are %d,%d,%d,%d", bounds.x, bounds.y, bounds.w, bounds.h);
 185                 //Debug("Windos is %d,%d", target.w, target.h);
 186                 for (int64_t x = max((int64_t)0, bounds.x); x <= min(bounds.x+bounds.w, target.w-1); ++x)
 187                 {
 188                         for (int64_t y = max((int64_t)0, bounds.y); y <= min(bounds.y + bounds.h, target.h-1); ++y)
 189                         {
 190                                 Real dx(2); dx *= Real(x - centre_x)/Real(bounds.w);
 191                                 Real dy(2); dy *= Real(y - centre_y)/Real(bounds.h);
 192                                 int64_t index = (x+target.w*y)*4;
 193
 194                                 if (dx*dx + dy*dy <= Real(1))
 195                                 {
 196                                         target.pixels[index+0] = 0;
 197                                         target.pixels[index+1] = 0;
 198                                         target.pixels[index+2] = 0;
 199                                         target.pixels[index+3] = 255;
 200                                 }
 201                         }
 202                 }
 203         }
 204 }
 205
 206 Rect ObjectRenderer::CPURenderBounds(const Rect & bounds, const View & view, const CPURenderTarget & target)
 207 {
 208         Rect result = view.TransformToViewCoords(bounds);
 209         result.x *= Real(target.w);
 210         result.y *= Real(target.h);
 211         result.w *= Real(target.w);
 212         result.h *= Real(target.h);
 213         return result;
 214 }
 215
 216 pair<int64_t, int64_t> ObjectRenderer::CPUPointLocation(const pair<Real, Real> & point, const View & view, const CPURenderTarget & target)
 217 {
 218         // hack...
 219         Rect result = view.TransformToViewCoords(Rect(point.first, point.second,1,1));
 220         int64_t x = result.x*target.w;
 221         int64_t y = result.y*target.h;
 222         return pair<int64_t, int64_t>(x,y);
 223 }
 224
 225
 226 /**
 227  * Bezier curve
 228  * Not sure how to apply De'Casteljau, will just use a bunch of Bresnham lines for now.
 229  */
 230 void BezierRenderer::RenderUsingCPU(const Objects & objects, const View & view, const CPURenderTarget & target, unsigned first_obj_id, unsigned last_obj_id)
 231 {
 232         //Warn("Rendering Beziers on CPU. Things may explode.");
 233         for (unsigned i = 0; i < m_indexes.size(); ++i)
 234         {
 235                 if (m_indexes[i] < first_obj_id) continue;
 236                 if (m_indexes[i] >= last_obj_id) continue;
 237                 const Rect & bounds = objects.bounds[m_indexes[i]];
 238                 PixelBounds pix_bounds(CPURenderBounds(bounds,view,target));
 239
 240                 Bezier control(objects.beziers[objects.data_indices[m_indexes[i]]].ToAbsolute(bounds),CPURenderBounds(Rect(0,0,1,1), view, target));
 241                 //Debug("%s -> %s via %s", objects.beziers[objects.data_indices[m_indexes[i]]].Str().c_str(), control.Str().c_str(), bounds.Str().c_str());
 242                 // Draw a rectangle around the bezier for debugging the bounds rectangle calculations
 243                 if (view.ShowingObjectBounds())
 244                 {
 245                         ObjectRenderer::RenderLineOnCPU(pix_bounds.x, pix_bounds.y, pix_bounds.x+pix_bounds.w, pix_bounds.y, target, Colour(1,0,0,1));
 246                         ObjectRenderer::RenderLineOnCPU(pix_bounds.x, pix_bounds.y+pix_bounds.h, pix_bounds.x+pix_bounds.w, pix_bounds.y+pix_bounds.h, target, Colour(0,1,0,1));
 247                         ObjectRenderer::RenderLineOnCPU(pix_bounds.x, pix_bounds.y, pix_bounds.x, pix_bounds.y+pix_bounds.h, target, Colour(1,0,0,1));
 248                         ObjectRenderer::RenderLineOnCPU(pix_bounds.x+pix_bounds.w, pix_bounds.y, pix_bounds.x+pix_bounds.w, pix_bounds.y+pix_bounds.h, target, Colour(0,1,0,1));
 249                 }
 250                 // Draw lines between the control points for debugging
 251                 //ObjectRenderer::RenderLineOnCPU((int64_t)control.x0, (int64_t)control.y0, (int64_t)control.x1, (int64_t)control.y1,target);
 252                 //ObjectRenderer::RenderLineOnCPU((int64_t)control.x1, (int64_t)control.y1, (int64_t)control.x2, (int64_t)control.y2,target);
 253
 254
 255
 256                 Real x[2]; Real y[2];
 257                 control.Evaluate(x[0], y[0], Real(0));
 258                 //Debug("target is (%lu, %lu)", target.w, target.h);
 259                 int64_t blen = min(max((int64_t)2, (int64_t)(target.w/view.GetBounds().w)), (int64_t)100);
 260
 261                 Real invblen(1); invblen /= blen;
 262                 //Debug("Using %li lines, inverse %f", blen, Double(invblen));
 263                 for (int64_t j = 1; j <= blen; ++j)
 264                 {
 265                         control.Evaluate(x[j % 2],y[j % 2], invblen*j);
 266                         ObjectRenderer::RenderLineOnCPU((int64_t)Double(x[0]),(int64_t)Double(y[0]), (int64_t)Double(x[1]),(int64_t)Double(y[1]), target);
 267                 }
 268
 269                 /*
 270                 Real u(0);
 271                 while (u < Real(1))
 272                 {
 273                         u += Real(1e-6);
 274                         Real x; Real y; control.Evaluate(x,y,u);
 275                         int64_t index = ((int64_t)x + (int64_t)y*target.w)*4;
 276                         if (index >= 0 && index < 4*(target.w*target.h))
 277                         {
 278                                 target.pixels[index+0] = 0;
 279                                 target.pixels[index+1] = 0;
 280                                 target.pixels[index+2] = 0;
 281                                 target.pixels[index+3] = 255;
 282                         }
 283                 }
 284                 */
 285
 286         }
 287 }
 288
 289 void BezierRenderer::PrepareBezierGPUBuffer(const Objects& objects)
 290 {
 291         m_bezier_coeffs.SetType(GraphicsBuffer::BufferTypeTexture);
 292         m_bezier_coeffs.SetUsage(GraphicsBuffer::BufferUsageDynamicDraw);
 293         m_bezier_coeffs.Resize(objects.beziers.size()*sizeof(GPUBezierCoeffs));
 294         BufferBuilder<GPUBezierCoeffs> builder(m_bezier_coeffs.Map(false, true, true), m_bezier_coeffs.GetSize());
 295
 296
 297         for (unsigned i = 0; i < objects.beziers.size(); ++i)
 298         {
 299                 const Bezier & bez = objects.beziers[i];
 300
 301                 GPUBezierCoeffs coeffs = {
 302                         Float(bez.x0), Float(bez.y0),
 303                         Float(bez.x1), Float(bez.y1),
 304                         Float(bez.x2), Float(bez.y2),
 305                         Float(bez.x3), Float(bez.y3)
 306                         };
 307                 builder.Add(coeffs);
 308         }
 309         m_bezier_coeffs.UnMap();
 310         glGenTextures(1, &m_bezier_buffer_texture);
 311         glBindTexture(GL_TEXTURE_BUFFER, m_bezier_buffer_texture);
 312         glTexBuffer(GL_TEXTURE_BUFFER, GL_RG32F, m_bezier_coeffs.GetHandle());
 313
 314         m_bezier_ids.SetType(GraphicsBuffer::BufferTypeTexture);
 315         m_bezier_ids.SetUsage(GraphicsBuffer::BufferUsageDynamicDraw);
 316         m_bezier_ids.Upload(objects.data_indices.size() * sizeof(uint32_t), &objects.data_indices[0]);
 317
 318         glGenTextures(1, &m_bezier_id_buffer_texture);
 319         glActiveTexture(GL_TEXTURE1);
 320         glBindTexture(GL_TEXTURE_BUFFER, m_bezier_id_buffer_texture);
 321         glTexBuffer(GL_TEXTURE_BUFFER, GL_R32I, m_bezier_ids.GetHandle());
 322         glActiveTexture(GL_TEXTURE0);
 323 }
 324
 325 void BezierRenderer::RenderUsingGPU(unsigned first_obj_id, unsigned last_obj_id)
 326 {
 327         if (!m_shader_program.Valid())
 328                 Warn("Shader is invalid (objects are of type %d)", m_type);
 329
 330         // If we don't have anything to render, return.
 331         if (first_obj_id == last_obj_id) return;
 332         // If there are no objects of this type, return.
 333         if (m_indexes.empty()) return;
 334
 335         unsigned first_index = 0;
 336         while (m_indexes.size() > first_index && m_indexes[first_index] < first_obj_id) first_index ++;
 337         unsigned last_index = first_index;
 338         while (m_indexes.size() > last_index && m_indexes[last_index] < last_obj_id) last_index ++;
 339
 340         m_shader_program.Use();
 341         glUniform1i(m_shader_program.GetUniformLocation("bezier_buffer_texture"), 0);
 342         glUniform1i(m_shader_program.GetUniformLocation("bezier_id_buffer_texture"), 1);
 343         m_ibo.Bind();
 344         glDrawElements(GL_LINES, (last_index-first_index)*2, GL_UNSIGNED_INT, (GLvoid*)(2*first_index*sizeof(uint32_t)));
 345 }
 346
 347
 348
 349 /**
 350  * Render Path (shading)
 351  */
 352 void PathRenderer::RenderUsingCPU(const Objects & objects, const View & view, const CPURenderTarget & target, unsigned first_obj_id, unsigned last_obj_id)
 353 {
 354         if (!view.ShowingObjectBounds() && !view.PerformingShading())
 355                 return;
 356
 357         for (unsigned i = 0; i < m_indexes.size(); ++i)
 358         {
 359                 if (m_indexes[i] < first_obj_id) continue;
 360                 if (m_indexes[i] >= last_obj_id) continue;
 361
 362
 363                 Rect bounds(CPURenderBounds(objects.bounds[m_indexes[i]], view, target));
 364                 PixelBounds pix_bounds(bounds);
 365                 pix_bounds.x-=1;
 366                 pix_bounds.w+=2;
 367                 pix_bounds.y-=1;
 368                 pix_bounds.h+=2;
 369                 const Path & path = objects.paths[objects.data_indices[m_indexes[i]]];
 370                 if (path.m_fill.a == 0 || !view.PerformingShading())
 371                         continue;
 372
 373
 374                 pair<int64_t,int64_t> top(CPUPointLocation(path.m_top, view, target));
 375                 pair<int64_t,int64_t> bottom(CPUPointLocation(path.m_bottom, view, target));
 376                 pair<int64_t,int64_t> left(CPUPointLocation(path.m_left, view, target));
 377                 pair<int64_t,int64_t> right(CPUPointLocation(path.m_right, view, target));
 378                 FloodFillOnCPU(top.first, top.second+1, pix_bounds, target, path.m_fill);
 379                 FloodFillOnCPU(bottom.first, bottom.second-1, pix_bounds, target, path.m_fill);
 380                 FloodFillOnCPU(left.first+1, left.second, pix_bounds, target, path.m_fill);
 381                 FloodFillOnCPU(right.first-1, right.second, pix_bounds, target, path.m_fill);
 382
 383                 if (view.ShowingObjectBounds())
 384                 {
 385                         Colour c(0,0,1,1);
 386                         RenderLineOnCPU(top.first, top.second, bottom.first, bottom.second, target, c);
 387                         RenderLineOnCPU(left.first, left.second, right.first, right.second, target, c);
 388                         ObjectRenderer::RenderLineOnCPU(pix_bounds.x, pix_bounds.y, pix_bounds.x+pix_bounds.w, pix_bounds.y, target, c);
 389                         ObjectRenderer::RenderLineOnCPU(pix_bounds.x, pix_bounds.y+pix_bounds.h, pix_bounds.x+pix_bounds.w, pix_bounds.y+pix_bounds.h, target, c);
 390                         ObjectRenderer::RenderLineOnCPU(pix_bounds.x, pix_bounds.y, pix_bounds.x, pix_bounds.y+pix_bounds.h, target, c);
 391                         ObjectRenderer::RenderLineOnCPU(pix_bounds.x+pix_bounds.w, pix_bounds.y, pix_bounds.x+pix_bounds.w, pix_bounds.y+pix_bounds.h, target, c);
 392                 }
 393
 394
 395         }
 396 }
 397
 398 /**
 399  * For debug, save pixels to bitmap
 400  */
 401 void ObjectRenderer::SaveBMP(const CPURenderTarget & target, const char * filename)
 402 {
 403         SDL_Surface * surf = SDL_CreateRGBSurfaceFrom(target.pixels, target.w, target.h, 8*4, target.w*4,
 404         #if SDL_BYTEORDER == SDL_LIL_ENDIAN
 405                 0x000000ff, 0x0000ff00, 0x00ff0000, 0xff000000
 406         #else
 407                 0xff000000, 0x00ff0000, 0x0000ff00, 0x000000ff
 408         #endif //SDL_BYTEORDER
 409         );
 410         if (surf == NULL)
 411                 Fatal("SDL_CreateRGBSurfaceFrom(pixels...) failed - %s", SDL_GetError());
 412         if (SDL_SaveBMP(surf, filename) != 0)
 413                 Fatal("SDL_SaveBMP failed - %s", SDL_GetError());
 414
 415         // Cleanup
 416         SDL_FreeSurface(surf);
 417 }
 418
 419 /**
 420  * Bresenham's lines
 421  */
 422 void ObjectRenderer::RenderLineOnCPU(int64_t x0, int64_t y0, int64_t x1, int64_t y1, const CPURenderTarget & target, const Colour & colour, bool transpose)
 423 {
 424         int64_t dx = x1 - x0;
 425         int64_t dy = y1 - y0;
 426         bool neg_m = (dy*dx < 0);
 427         dy = abs(dy);
 428         dx = abs(dx);
 429
 430         // If positive slope > 1, just swap x and y
 431         if (dy > dx)
 432         {
 433                 RenderLineOnCPU(y0,x0,y1,x1,target,colour,!transpose);
 434                 return;
 435         }
 436
 437         int64_t two_dy = 2*dy;
 438         int64_t p = two_dy - dx;
 439         int64_t two_dxdy = 2*(dy-dx);
 440         int64_t x; int64_t y; int64_t x_end;
 441         int64_t width = (transpose ? target.h : target.w);
 442         int64_t height = (transpose ? target.w : target.h);
 443
 444         uint8_t rgba[4];
 445         rgba[0] = 255*colour.r;
 446         rgba[1] = 255*colour.g;
 447         rgba[2] = 255*colour.b;
 448         rgba[3] = 255*colour.a;
 449
 450         if (x0 > x1)
 451         {
 452                 x = x1;
 453                 y = y1;
 454                 x_end = x0;
 455         }
 456         else
 457         {
 458                 x = x0;
 459                 y = y0;
 460                 x_end = x1;
 461         }
 462
 463         if (x < 0)
 464         {
 465                 if (x_end < 0) return;
 466                 y = (neg_m ? y - (dy*-x)/dx : y + (dy*-x)/dx);
 467                 x = 0;
 468         }
 469
 470         if (x_end > width)
 471         {
 472                 if (x > width) return;
 473                 x_end = width-1;
 474         }
 475
 476         // TODO: Avoid extra inner conditionals
 477         do
 478         {
 479                 if (x >= 0 && x < width && y >= 0 && y < height)
 480                 {
 481                         int64_t index = (transpose ? (y + x*target.w)*4 : (x + y*target.w)*4);
 482                         for (int i = 0; i < 4; ++i)
 483                                 target.pixels[index+i] = rgba[i];
 484                 }
 485                 if (p < 0)
 486                         p += two_dy;
 487                 else
 488                 {
 489                         if (neg_m) --y; else ++y;
 490                         p += two_dxdy;
 491                 }
 492         } while (++x <= x_end);
 493 }
 494
 495 void ObjectRenderer::FloodFillOnCPU(int64_t x, int64_t y, const PixelBounds & bounds, const CPURenderTarget & target, const Colour & fill)
 496 {
 497         if (x < 0 || x < bounds.x || x > bounds.x+bounds.w || x >= target.w)
 498                 return;
 499         if (y < 0 || y < bounds.y || y > bounds.y+bounds.h || y >= target.h)
 500                 return;
 501
 502         if (GetColour(target, x, y) != Colour(1,1,1,1))
 503                 return;
 504
 505         SetColour(target, x, y, fill);
 506         FloodFillOnCPU(x-1, y, bounds, target, fill);
 507         FloodFillOnCPU(x+1, y, bounds, target, fill);
 508         FloodFillOnCPU(x,y-1,bounds,target,fill);
 509         FloodFillOnCPU(x,y+1,bounds,target,fill);
 510
 511 }
 512
 513 }