src/video/gl/gl_painter.cpp

   1 //  SuperTux
   2 //  Copyright (C) 2014 Ingo Ruhnke <grumbel@gmail.com>
   3 //
   4 //  This program is free software: you can redistribute it and/or modify
   5 //  it under the terms of the GNU General Public License as published by
   6 //  the Free Software Foundation, either version 3 of the License, or
   7 //  (at your option) any later version.
   8 //
   9 //  This program is distributed in the hope that it will be useful,
  10 //  but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 //  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 //  GNU General Public License for more details.
  13 //
  14 //  You should have received a copy of the GNU General Public License
  15 //  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16
  17 #include "video/gl/gl_painter.hpp"
  18
  19 #include "video/drawing_request.hpp"
  20 #include "video/gl/gl_surface_data.hpp"
  21 #include "video/gl/gl_texture.hpp"
  22
  23 GLuint GLPainter::s_last_texture = static_cast<GLuint>(-1);
  24
  25 namespace {
  26
  27 inline void intern_draw(float left, float top, float right, float bottom,
  28                         float uv_left, float uv_top,
  29                         float uv_right, float uv_bottom,
  30                         float angle, float alpha,
  31                         const Color& color,
  32                         const Blend& blend,
  33                         DrawingEffect effect)
  34 {
  35   if(effect & HORIZONTAL_FLIP)
  36     std::swap(uv_left, uv_right);
  37
  38   if(effect & VERTICAL_FLIP)
  39     std::swap(uv_top, uv_bottom);
  40
  41   glBlendFunc(blend.sfactor, blend.dfactor);
  42   glColor4f(color.red, color.green, color.blue, color.alpha * alpha);
  43
  44   // unrotated blit
  45   if (angle == 0.0f) {
  46     float vertices[] = {
  47       left, top,
  48       right, top,
  49       right, bottom,
  50       left, bottom,
  51     };
  52     glVertexPointer(2, GL_FLOAT, 0, vertices);
  53
  54     float uvs[] = {
  55       uv_left, uv_top,
  56       uv_right, uv_top,
  57       uv_right, uv_bottom,
  58       uv_left, uv_bottom,
  59     };
  60     glTexCoordPointer(2, GL_FLOAT, 0, uvs);
  61
  62     glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
  63   } else {
  64     // rotated blit
  65     float center_x = (left + right) / 2;
  66     float center_y = (top + bottom) / 2;
  67
  68     float sa = sinf(angle/180.0f*M_PI);
  69     float ca = cosf(angle/180.0f*M_PI);
  70
  71     left  -= center_x;
  72     right -= center_x;
  73
  74     top    -= center_y;
  75     bottom -= center_y;
  76
  77     float vertices[] = {
  78       left*ca - top*sa + center_x, left*sa + top*ca + center_y,
  79       right*ca - top*sa + center_x, right*sa + top*ca + center_y,
  80       right*ca - bottom*sa + center_x, right*sa + bottom*ca + center_y,
  81       left*ca - bottom*sa + center_x, left*sa + bottom*ca + center_y
  82     };
  83     glVertexPointer(2, GL_FLOAT, 0, vertices);
  84
  85     float uvs[] = {
  86       uv_left, uv_top,
  87       uv_right, uv_top,
  88       uv_right, uv_bottom,
  89       uv_left, uv_bottom,
  90     };
  91     glTexCoordPointer(2, GL_FLOAT, 0, uvs);
  92
  93     glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
  94   }
  95
  96   // FIXME: find a better way to restore the blend mode
  97   glColor4f(1.0f, 1.0f, 1.0f, 1.0f);
  98   glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
  99 }
 100
 101 } // namespace
 102
 103 void
 104 GLPainter::draw_surface(const DrawingRequest& request)
 105 {
 106   const Surface* surface = static_cast<const SurfaceRequest*>(request.request_data)->surface;
 107   if(surface == NULL)
 108   {
 109     return;
 110   }
 111   GLTexture* gltexture = static_cast<GLTexture*>(surface->get_texture().get());
 112   if(gltexture == NULL)
 113   {
 114     return;
 115   }
 116   GLSurfaceData *surface_data = static_cast<GLSurfaceData*>(surface->get_surface_data());
 117   if(surface_data == NULL)
 118   {
 119     return;
 120   }
 121
 122   GLuint th = gltexture->get_handle();
 123   if (th != s_last_texture) {
 124     s_last_texture = th;
 125     glBindTexture(GL_TEXTURE_2D, th);
 126   }
 127   intern_draw(request.pos.x, request.pos.y,
 128               request.pos.x + surface->get_width(),
 129               request.pos.y + surface->get_height(),
 130               surface_data->get_uv_left(),
 131               surface_data->get_uv_top(),
 132               surface_data->get_uv_right(),
 133               surface_data->get_uv_bottom(),
 134               request.angle,
 135               request.alpha,
 136               request.color,
 137               request.blend,
 138               request.drawing_effect);
 139 }
 140
 141 void
 142 GLPainter::draw_surface_part(const DrawingRequest& request)
 143 {
 144   const SurfacePartRequest* surfacepartrequest
 145     = (SurfacePartRequest*) request.request_data;
 146   const Surface* surface = surfacepartrequest->surface;
 147   std::shared_ptr<GLTexture> gltexture = std::dynamic_pointer_cast<GLTexture>(surface->get_texture());
 148   GLSurfaceData *surface_data = reinterpret_cast<GLSurfaceData *>(surface->get_surface_data());
 149
 150   float uv_width = surface_data->get_uv_right() - surface_data->get_uv_left();
 151   float uv_height = surface_data->get_uv_bottom() - surface_data->get_uv_top();
 152
 153   float uv_left = surface_data->get_uv_left() + (uv_width * surfacepartrequest->srcrect.p1.x) / surface->get_width();
 154   float uv_top = surface_data->get_uv_top() + (uv_height * surfacepartrequest->srcrect.p1.y) / surface->get_height();
 155   float uv_right = surface_data->get_uv_left() + (uv_width * surfacepartrequest->srcrect.p2.x) / surface->get_width();
 156   float uv_bottom = surface_data->get_uv_top() + (uv_height * surfacepartrequest->srcrect.p2.y) / surface->get_height();
 157
 158   GLuint th = gltexture->get_handle();
 159   if (th != s_last_texture) {
 160     s_last_texture = th;
 161     glBindTexture(GL_TEXTURE_2D, th);
 162   }
 163   intern_draw(request.pos.x, request.pos.y,
 164               request.pos.x + surfacepartrequest->dstsize.width,
 165               request.pos.y + surfacepartrequest->dstsize.height,
 166               uv_left,
 167               uv_top,
 168               uv_right,
 169               uv_bottom,
 170               0.0,
 171               request.alpha,
 172               request.color,
 173               Blend(),
 174               request.drawing_effect);
 175 }
 176
 177 void
 178 GLPainter::draw_gradient(const DrawingRequest& request)
 179 {
 180   const GradientRequest* gradientrequest
 181     = (GradientRequest*) request.request_data;
 182   const Color& top = gradientrequest->top;
 183   const Color& bottom = gradientrequest->bottom;
 184
 185   glDisable(GL_TEXTURE_2D);
 186   glDisableClientState(GL_TEXTURE_COORD_ARRAY);
 187   glEnableClientState(GL_COLOR_ARRAY);
 188
 189   float vertices[] = {
 190     0, 0,
 191     float(SCREEN_WIDTH), 0,
 192     float(SCREEN_WIDTH), float(SCREEN_HEIGHT),
 193     0, float(SCREEN_HEIGHT)
 194   };
 195   glVertexPointer(2, GL_FLOAT, 0, vertices);
 196
 197   float colors[] = {
 198     top.red, top.green, top.blue, top.alpha,
 199     top.red, top.green, top.blue, top.alpha,
 200     bottom.red, bottom.green, bottom.blue, bottom.alpha,
 201     bottom.red, bottom.green, bottom.blue, bottom.alpha,
 202   };
 203   glColorPointer(4, GL_FLOAT, 0, colors);
 204
 205   glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
 206
 207   glDisableClientState(GL_COLOR_ARRAY);
 208   glEnableClientState(GL_TEXTURE_COORD_ARRAY);
 209
 210   glEnable(GL_TEXTURE_2D);
 211   glColor4f(1, 1, 1, 1);
 212 }
 213
 214 void
 215 GLPainter::draw_filled_rect(const DrawingRequest& request)
 216 {
 217   const FillRectRequest* fillrectrequest
 218     = (FillRectRequest*) request.request_data;
 219
 220   glDisable(GL_TEXTURE_2D);
 221   glColor4f(fillrectrequest->color.red, fillrectrequest->color.green,
 222             fillrectrequest->color.blue, fillrectrequest->color.alpha);
 223   glDisableClientState(GL_TEXTURE_COORD_ARRAY);
 224
 225   if (fillrectrequest->radius != 0.0f)
 226   {
 227     // draw round rect
 228     // Keep radius in the limits, so that we get a circle instead of
 229     // just graphic junk
 230     float radius = std::min(fillrectrequest->radius,
 231                             std::min(fillrectrequest->size.x/2,
 232                                      fillrectrequest->size.y/2));
 233
 234     // inner rectangle
 235     Rectf irect(request.pos.x    + radius,
 236                 request.pos.y    + radius,
 237                 request.pos.x + fillrectrequest->size.x - radius,
 238                 request.pos.y + fillrectrequest->size.y - radius);
 239
 240     int n = 8;
 241     int p = 0;
 242     std::vector<float> vertices((n+1) * 4 * 2);
 243
 244     for(int i = 0; i <= n; ++i)
 245     {
 246       float x = sinf(i * (M_PI/2) / n) * radius;
 247       float y = cosf(i * (M_PI/2) / n) * radius;
 248
 249       vertices[p++] = irect.get_left() - x;
 250       vertices[p++] = irect.get_top()  - y;
 251
 252       vertices[p++] = irect.get_right() + x;
 253       vertices[p++] = irect.get_top()   - y;
 254     }
 255
 256     for(int i = 0; i <= n; ++i)
 257     {
 258       float x = cosf(i * (M_PI/2) / n) * radius;
 259       float y = sinf(i * (M_PI/2) / n) * radius;
 260
 261       vertices[p++] = irect.get_left()   - x;
 262       vertices[p++] = irect.get_bottom() + y;
 263
 264       vertices[p++] = irect.get_right()  + x;
 265       vertices[p++] = irect.get_bottom() + y;
 266     }
 267
 268     glVertexPointer(2, GL_FLOAT, 0, &*vertices.begin());
 269     glDrawArrays(GL_TRIANGLE_STRIP, 0,  vertices.size()/2);
 270   }
 271   else
 272   {
 273     float x = request.pos.x;
 274     float y = request.pos.y;
 275     float w = fillrectrequest->size.x;
 276     float h = fillrectrequest->size.y;
 277
 278     float vertices[] = {
 279       x,   y,
 280       x+w, y,
 281       x+w, y+h,
 282       x,   y+h
 283     };
 284     glVertexPointer(2, GL_FLOAT, 0, vertices);
 285
 286     glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
 287   }
 288
 289   glEnableClientState(GL_TEXTURE_COORD_ARRAY);
 290   glEnable(GL_TEXTURE_2D);
 291   glColor4f(1, 1, 1, 1);
 292 }
 293
 294 void
 295 GLPainter::draw_inverse_ellipse(const DrawingRequest& request)
 296 {
 297   const InverseEllipseRequest* ellipse = (InverseEllipseRequest*)request.request_data;
 298
 299   glDisable(GL_TEXTURE_2D);
 300   glColor4f(ellipse->color.red,  ellipse->color.green,
 301             ellipse->color.blue, ellipse->color.alpha);
 302
 303   float x = request.pos.x;
 304   float y = request.pos.y;
 305   float w = ellipse->size.x/2.0f;
 306   float h = ellipse->size.y/2.0f;
 307
 308   static const int slices = 16;
 309   static const int points = (slices+1) * 12;
 310
 311   float vertices[points * 2];
 312   int   p = 0;
 313
 314   // Bottom
 315   vertices[p++] = SCREEN_WIDTH; vertices[p++] = SCREEN_HEIGHT;
 316   vertices[p++] = 0;            vertices[p++] = SCREEN_HEIGHT;
 317   vertices[p++] = x;            vertices[p++] = y+h;
 318
 319   // Top
 320   vertices[p++] = SCREEN_WIDTH; vertices[p++] = 0;
 321   vertices[p++] = 0;            vertices[p++] = 0;
 322   vertices[p++] = x;            vertices[p++] = y-h;
 323
 324   // Left
 325   vertices[p++] = SCREEN_WIDTH; vertices[p++] = 0;
 326   vertices[p++] = SCREEN_WIDTH; vertices[p++] = SCREEN_HEIGHT;
 327   vertices[p++] = x+w;          vertices[p++] = y;
 328
 329   // Right
 330   vertices[p++] = 0;            vertices[p++] = 0;
 331   vertices[p++] = 0;            vertices[p++] = SCREEN_HEIGHT;
 332   vertices[p++] = x-w;          vertices[p++] = y;
 333
 334   for(int i = 0; i < slices; ++i)
 335   {
 336     float ex1 = sinf(M_PI/2 / slices * i) * w;
 337     float ey1 = cosf(M_PI/2 / slices * i) * h;
 338
 339     float ex2 = sinf(M_PI/2 / slices * (i+1)) * w;
 340     float ey2 = cosf(M_PI/2 / slices * (i+1)) * h;
 341
 342     // Bottom/Right
 343     vertices[p++] = SCREEN_WIDTH; vertices[p++] = SCREEN_HEIGHT;
 344     vertices[p++] = x + ex1;      vertices[p++] = y + ey1;
 345     vertices[p++] = x + ex2;      vertices[p++] = y + ey2;
 346
 347     // Top/Left
 348     vertices[p++] = 0;            vertices[p++] = 0;
 349     vertices[p++] = x - ex1;      vertices[p++] = y - ey1;
 350     vertices[p++] = x - ex2;      vertices[p++] = y - ey2;
 351
 352     // Top/Right
 353     vertices[p++] = SCREEN_WIDTH; vertices[p++] = 0;
 354     vertices[p++] = x + ex1;      vertices[p++] = y - ey1;
 355     vertices[p++] = x + ex2;      vertices[p++] = y - ey2;
 356
 357     // Bottom/Left
 358     vertices[p++] = 0;            vertices[p++] = SCREEN_HEIGHT;
 359     vertices[p++] = x - ex1;      vertices[p++] = y + ey1;
 360     vertices[p++] = x - ex2;      vertices[p++] = y + ey2;
 361   }
 362
 363   glDisableClientState(GL_TEXTURE_COORD_ARRAY);
 364   glVertexPointer(2, GL_FLOAT, 0, vertices);
 365
 366   glDrawArrays(GL_TRIANGLES, 0, points);
 367
 368   glEnableClientState(GL_TEXTURE_COORD_ARRAY);
 369
 370   glEnable(GL_TEXTURE_2D);
 371   glColor4f(1, 1, 1, 1);
 372 }
 373
 374 /* EOF */