4 // Copyright (C) 2006 Matthias Braun <matze@braunis.de>
6 // This program is free software; you can redistribute it and/or
7 // modify it under the terms of the GNU General Public License
8 // as published by the Free Software Foundation; either version 2
9 // of the License, or (at your option) any later version.
11 // This program is distributed in the hope that it will be useful,
12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 // GNU General Public License for more details.
16 // You should have received a copy of the GNU General Public License
17 // along with this program; if not, write to the Free Software
18 // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
25 #include <SDL_image.h>
28 #include "drawing_context.hpp"
29 #include "surface.hpp"
32 #include "gameconfig.hpp"
34 #include "texture.hpp"
35 #include "texture_manager.hpp"
37 #define LIGHTMAP_DIV 4
39 static inline int next_po2(int val)
48 DrawingContext::DrawingContext()
50 screen = SDL_GetVideoSurface();
52 lightmap_width = screen->w / LIGHTMAP_DIV;
53 lightmap_height = screen->h / LIGHTMAP_DIV;
54 unsigned int width = next_po2(lightmap_width);
55 unsigned int height = next_po2(lightmap_height);
57 lightmap = new Texture(width, height, GL_RGB);
59 lightmap_uv_right = static_cast<float>(lightmap_width) / static_cast<float>(width);
60 lightmap_uv_bottom = static_cast<float>(lightmap_height) / static_cast<float>(height);
61 texture_manager->register_texture(lightmap);
63 requests = &drawing_requests;
66 DrawingContext::~DrawingContext()
68 texture_manager->remove_texture(lightmap);
73 DrawingContext::draw_surface(const Surface* surface, const Vector& position,
74 float angle, const Color& color, const Blend& blend,
79 DrawingRequest request;
81 request.type = SURFACE;
82 request.pos = transform.apply(position);
84 if(request.pos.x >= SCREEN_WIDTH || request.pos.y >= SCREEN_HEIGHT
85 || request.pos.x + surface->get_width() < 0
86 || request.pos.y + surface->get_height() < 0)
89 request.layer = layer;
90 request.drawing_effect = transform.drawing_effect;
91 request.alpha = transform.alpha;
92 request.angle = angle;
93 request.color = color;
94 request.blend = blend;
96 request.request_data = const_cast<Surface*> (surface);
98 requests->push_back(request);
102 DrawingContext::draw_surface(const Surface* surface, const Vector& position,
105 draw_surface(surface, position, 0.0f, Color(1.0f, 1.0f, 1.0f), Blend(), layer);
109 DrawingContext::draw_surface_part(const Surface* surface, const Vector& source,
110 const Vector& size, const Vector& dest, int layer)
112 assert(surface != 0);
114 DrawingRequest request;
116 request.type = SURFACE_PART;
117 request.pos = transform.apply(dest);
118 request.layer = layer;
119 request.drawing_effect = transform.drawing_effect;
120 request.alpha = transform.alpha;
122 SurfacePartRequest* surfacepartrequest = new SurfacePartRequest();
123 surfacepartrequest->size = size;
124 surfacepartrequest->source = source;
125 surfacepartrequest->surface = surface;
127 // clip on screen borders
128 if(request.pos.x < 0) {
129 surfacepartrequest->size.x += request.pos.x;
130 if(surfacepartrequest->size.x <= 0)
132 surfacepartrequest->source.x -= request.pos.x;
135 if(request.pos.y < 0) {
136 surfacepartrequest->size.y += request.pos.y;
137 if(surfacepartrequest->size.y <= 0)
139 surfacepartrequest->source.y -= request.pos.y;
142 request.request_data = surfacepartrequest;
144 requests->push_back(request);
148 DrawingContext::draw_text(const Font* font, const std::string& text,
149 const Vector& position, FontAlignment alignment, int layer)
151 DrawingRequest request;
154 request.pos = transform.apply(position);
155 request.layer = layer;
156 request.drawing_effect = transform.drawing_effect;
157 request.alpha = transform.alpha;
159 TextRequest* textrequest = new TextRequest;
160 textrequest->font = font;
161 textrequest->text = text;
162 textrequest->alignment = alignment;
163 request.request_data = textrequest;
165 requests->push_back(request);
169 DrawingContext::draw_center_text(const Font* font, const std::string& text,
170 const Vector& position, int layer)
172 draw_text(font, text, Vector(position.x + SCREEN_WIDTH/2, position.y),
173 CENTER_ALLIGN, layer);
177 DrawingContext::draw_gradient(const Color& top, const Color& bottom, int layer)
179 DrawingRequest request;
181 request.type = GRADIENT;
182 request.pos = Vector(0,0);
183 request.layer = layer;
185 request.drawing_effect = transform.drawing_effect;
186 request.alpha = transform.alpha;
188 GradientRequest* gradientrequest = new GradientRequest;
189 gradientrequest->top = top;
190 gradientrequest->bottom = bottom;
191 request.request_data = gradientrequest;
193 requests->push_back(request);
197 DrawingContext::draw_filled_rect(const Vector& topleft, const Vector& size,
198 const Color& color, int layer)
200 DrawingRequest request;
202 request.type = FILLRECT;
203 request.pos = transform.apply(topleft);
204 request.layer = layer;
206 request.drawing_effect = transform.drawing_effect;
207 request.alpha = transform.alpha;
209 FillRectRequest* fillrectrequest = new FillRectRequest;
210 fillrectrequest->size = size;
211 fillrectrequest->color = color;
212 fillrectrequest->color.alpha = color.alpha * transform.alpha;
213 request.request_data = fillrectrequest;
215 requests->push_back(request);
219 DrawingContext::draw_filled_rect(const Rect& rect, const Color& color,
222 DrawingRequest request;
224 request.type = FILLRECT;
225 request.pos = transform.apply(rect.p1);
226 request.layer = layer;
228 request.drawing_effect = transform.drawing_effect;
229 request.alpha = transform.alpha;
231 FillRectRequest* fillrectrequest = new FillRectRequest;
232 fillrectrequest->size = Vector(rect.get_width(), rect.get_height());
233 fillrectrequest->color = color;
234 fillrectrequest->color.alpha = color.alpha * transform.alpha;
235 request.request_data = fillrectrequest;
237 requests->push_back(request);
241 DrawingContext::draw_surface_part(DrawingRequest& request)
243 SurfacePartRequest* surfacepartrequest
244 = (SurfacePartRequest*) request.request_data;
246 surfacepartrequest->surface->draw_part(
247 surfacepartrequest->source.x, surfacepartrequest->source.y,
248 request.pos.x, request.pos.y,
249 surfacepartrequest->size.x, surfacepartrequest->size.y,
250 request.alpha, request.drawing_effect);
252 delete surfacepartrequest;
256 DrawingContext::draw_gradient(DrawingRequest& request)
258 GradientRequest* gradientrequest = (GradientRequest*) request.request_data;
259 const Color& top = gradientrequest->top;
260 const Color& bottom = gradientrequest->bottom;
262 glDisable(GL_TEXTURE_2D);
264 glColor4f(top.red, top.green, top.blue, top.alpha);
266 glVertex2f(SCREEN_WIDTH, 0);
267 glColor4f(bottom.red, bottom.green, bottom.blue, bottom.alpha);
268 glVertex2f(SCREEN_WIDTH, SCREEN_HEIGHT);
269 glVertex2f(0, SCREEN_HEIGHT);
271 glEnable(GL_TEXTURE_2D);
273 delete gradientrequest;
277 DrawingContext::draw_text(DrawingRequest& request)
279 TextRequest* textrequest = (TextRequest*) request.request_data;
281 textrequest->font->draw(textrequest->text, request.pos,
282 textrequest->alignment, request.drawing_effect, request.alpha);
288 DrawingContext::draw_filled_rect(DrawingRequest& request)
290 FillRectRequest* fillrectrequest = (FillRectRequest*) request.request_data;
292 float x = request.pos.x;
293 float y = request.pos.y;
294 float w = fillrectrequest->size.x;
295 float h = fillrectrequest->size.y;
297 glDisable(GL_TEXTURE_2D);
298 glColor4f(fillrectrequest->color.red, fillrectrequest->color.green,
299 fillrectrequest->color.blue, fillrectrequest->color.alpha);
304 glVertex2f(x+w, y+h);
307 glEnable(GL_TEXTURE_2D);
309 delete fillrectrequest;
313 DrawingContext::do_drawing()
316 assert(transformstack.empty());
317 assert(target_stack.empty());
319 transformstack.clear();
320 target_stack.clear();
322 bool use_lightmap = lightmap_requests.size() != 0;
324 // PART1: create lightmap
326 glViewport(0, screen->h - lightmap_height, lightmap_width, lightmap_height);
327 glMatrixMode(GL_PROJECTION);
329 glOrtho(0, SCREEN_WIDTH, SCREEN_HEIGHT, 0, -1.0, 1.0);
330 glMatrixMode(GL_MODELVIEW);
333 // FIXME: Add ambient light support here
334 glClearColor(0.3, 0.3, 0.4, 1);
335 glClear(GL_COLOR_BUFFER_BIT);
336 handle_drawing_requests(lightmap_requests);
337 lightmap_requests.clear();
340 glBindTexture(GL_TEXTURE_2D, lightmap->get_handle());
341 glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 0, screen->h - lightmap_height, lightmap_width, lightmap_height);
343 glViewport(0, 0, screen->w, screen->h);
344 glMatrixMode(GL_PROJECTION);
346 glOrtho(0, SCREEN_WIDTH, SCREEN_HEIGHT, 0, -1.0, 1.0);
347 glMatrixMode(GL_MODELVIEW);
352 //glClear(GL_COLOR_BUFFER_BIT);
353 handle_drawing_requests(drawing_requests);
354 drawing_requests.clear();
357 // multiple the lightmap with the framebuffer
358 glBlendFunc(GL_DST_COLOR, GL_ZERO);
360 glBindTexture(GL_TEXTURE_2D, lightmap->get_handle());
363 glTexCoord2f(0, lightmap_uv_bottom);
366 glTexCoord2f(lightmap_uv_right, lightmap_uv_bottom);
367 glVertex2f(SCREEN_WIDTH, 0);
369 glTexCoord2f(lightmap_uv_right, 0);
370 glVertex2f(SCREEN_WIDTH, SCREEN_HEIGHT);
373 glVertex2f(0, SCREEN_HEIGHT);
377 glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
380 assert_gl("drawing");
382 SDL_GL_SwapBuffers();
386 DrawingContext::handle_drawing_requests(DrawingRequests& requests)
388 std::stable_sort(requests.begin(), requests.end());
390 for(DrawingRequests::iterator i = requests.begin();
391 i != requests.end(); ++i) {
395 const Surface* surface = (const Surface*) i->request_data;
396 if (i->angle == 0.0f)
397 surface->draw(i->pos.x, i->pos.y, i->alpha, i->drawing_effect);
399 surface->draw(i->pos.x, i->pos.y, i->alpha, i->angle, i->color, i->blend, i->drawing_effect);
403 draw_surface_part(*i);
412 draw_filled_rect(*i);
419 DrawingContext::push_transform()
421 transformstack.push_back(transform);
425 DrawingContext::pop_transform()
427 assert(!transformstack.empty());
429 transform = transformstack.back();
430 transformstack.pop_back();
434 DrawingContext::set_drawing_effect(DrawingEffect effect)
436 transform.drawing_effect = effect;
440 DrawingContext::get_drawing_effect() const
442 return transform.drawing_effect;
446 DrawingContext::set_alpha(float alpha)
448 transform.alpha = alpha;
452 DrawingContext::get_alpha() const
454 return transform.alpha;
458 DrawingContext::push_target()
460 target_stack.push_back(target);
464 DrawingContext::pop_target()
466 set_target(target_stack.back());
467 target_stack.pop_back();
471 DrawingContext::set_target(Target target)
473 this->target = target;
474 if(target == LIGHTMAP)
475 requests = &lightmap_requests;
477 requests = &drawing_requests;