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"
36 #define LIGHTMAP_DIV 1
38 static inline int next_po2(int val)
47 DrawingContext::DrawingContext()
48 : ambient_color( 1.0f, 1.0f, 1.0f, 1.0f )
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::get_light(const Vector& position, Color* color)
243 if( ambient_color.red == 1.0f && ambient_color.green == 1.0f
244 && ambient_color.blue == 1.0f ) {
245 *color = Color( 1.0f, 1.0f, 1.0f);
248 DrawingRequest request;
249 request.type = GETLIGHT;
250 request.pos = transform.apply(position);
251 request.layer = LAYER_GUI; //make sure all get_light requests are handled last.
253 GetLightRequest* getlightrequest = new GetLightRequest;
254 getlightrequest->color_ptr = color;
255 request.request_data = getlightrequest;
256 lightmap_requests.push_back(request);
260 DrawingContext::get_light(DrawingRequest& request)
262 GetLightRequest* getlightrequest = (GetLightRequest*) request.request_data;
265 for( int i = 0; i<3; i++)
266 pixels[i] = 0.0f; //set to black
268 float posX = request.pos.x /LIGHTMAP_DIV;
269 float posY = SCREEN_HEIGHT - request.pos.y / LIGHTMAP_DIV;
270 glReadPixels((GLint) posX, (GLint) posY , 1, 1, GL_RGB, GL_FLOAT, pixels);
271 *(getlightrequest->color_ptr) = Color( pixels[0], pixels[1], pixels[2]);
272 //draw_filled_rect( Vector(posX, posY), Vector(1,1), Color( 1.0f, 1.0f, 1.0f) ,LAYER_GUI);
273 //printf("get_light %f/%f r%f g%f b%f\n", request.pos.x, request.pos.y, pixels[0], pixels[1], pixels[2]);
275 delete getlightrequest;
279 DrawingContext::draw_surface_part(DrawingRequest& request)
281 SurfacePartRequest* surfacepartrequest
282 = (SurfacePartRequest*) request.request_data;
284 surfacepartrequest->surface->draw_part(
285 surfacepartrequest->source.x, surfacepartrequest->source.y,
286 request.pos.x, request.pos.y,
287 surfacepartrequest->size.x, surfacepartrequest->size.y,
288 request.alpha, request.drawing_effect);
290 delete surfacepartrequest;
294 DrawingContext::draw_gradient(DrawingRequest& request)
296 GradientRequest* gradientrequest = (GradientRequest*) request.request_data;
297 const Color& top = gradientrequest->top;
298 const Color& bottom = gradientrequest->bottom;
300 glDisable(GL_TEXTURE_2D);
302 glColor4f(top.red, top.green, top.blue, top.alpha);
304 glVertex2f(SCREEN_WIDTH, 0);
305 glColor4f(bottom.red, bottom.green, bottom.blue, bottom.alpha);
306 glVertex2f(SCREEN_WIDTH, SCREEN_HEIGHT);
307 glVertex2f(0, SCREEN_HEIGHT);
309 glEnable(GL_TEXTURE_2D);
311 delete gradientrequest;
315 DrawingContext::draw_text(DrawingRequest& request)
317 TextRequest* textrequest = (TextRequest*) request.request_data;
319 textrequest->font->draw(textrequest->text, request.pos,
320 textrequest->alignment, request.drawing_effect, request.alpha);
326 DrawingContext::draw_filled_rect(DrawingRequest& request)
328 FillRectRequest* fillrectrequest = (FillRectRequest*) request.request_data;
330 float x = request.pos.x;
331 float y = request.pos.y;
332 float w = fillrectrequest->size.x;
333 float h = fillrectrequest->size.y;
335 glDisable(GL_TEXTURE_2D);
336 glColor4f(fillrectrequest->color.red, fillrectrequest->color.green,
337 fillrectrequest->color.blue, fillrectrequest->color.alpha);
342 glVertex2f(x+w, y+h);
345 glEnable(GL_TEXTURE_2D);
347 delete fillrectrequest;
351 DrawingContext::draw_lightmap(DrawingRequest& request)
353 const Texture* texture = reinterpret_cast<Texture*> (request.request_data);
355 // multiple the lightmap with the framebuffer
356 glBlendFunc(GL_DST_COLOR, GL_ZERO);
358 glBindTexture(GL_TEXTURE_2D, texture->get_handle());
361 glTexCoord2f(0, lightmap_uv_bottom);
364 glTexCoord2f(lightmap_uv_right, lightmap_uv_bottom);
365 glVertex2f(SCREEN_WIDTH, 0);
367 glTexCoord2f(lightmap_uv_right, 0);
368 glVertex2f(SCREEN_WIDTH, SCREEN_HEIGHT);
371 glVertex2f(0, SCREEN_HEIGHT);
375 glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
379 DrawingContext::do_drawing()
382 assert(transformstack.empty());
383 assert(target_stack.empty());
385 transformstack.clear();
386 target_stack.clear();
388 //Use Lightmap if ambient color is not white.
389 bool use_lightmap = ( ambient_color.red != 1.0f || ambient_color.green != 1.0f ||
390 ambient_color.blue != 1.0f );
392 // PART1: create lightmap
394 glViewport(0, screen->h - lightmap_height, lightmap_width, lightmap_height);
395 glMatrixMode(GL_PROJECTION);
397 glOrtho(0, SCREEN_WIDTH, SCREEN_HEIGHT, 0, -1.0, 1.0);
398 glMatrixMode(GL_MODELVIEW);
401 glClearColor( ambient_color.red, ambient_color.green, ambient_color.blue, 1 );
402 glClear(GL_COLOR_BUFFER_BIT);
403 handle_drawing_requests(lightmap_requests);
404 lightmap_requests.clear();
407 glBindTexture(GL_TEXTURE_2D, lightmap->get_handle());
408 glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 0, screen->h - lightmap_height, lightmap_width, lightmap_height);
410 glViewport(0, 0, screen->w, screen->h);
411 glMatrixMode(GL_PROJECTION);
413 glOrtho(0, SCREEN_WIDTH, SCREEN_HEIGHT, 0, -1.0, 1.0);
414 glMatrixMode(GL_MODELVIEW);
418 // add a lightmap drawing request into the queue
419 DrawingRequest request;
420 request.type = LIGHTMAPREQUEST;
421 request.layer = LAYER_HUD - 1;
422 request.request_data = lightmap;
423 requests->push_back(request);
426 //glClear(GL_COLOR_BUFFER_BIT);
427 handle_drawing_requests(drawing_requests);
428 drawing_requests.clear();
429 assert_gl("drawing");
431 SDL_GL_SwapBuffers();
435 DrawingContext::handle_drawing_requests(DrawingRequests& requests)
437 std::stable_sort(requests.begin(), requests.end());
439 for(DrawingRequests::iterator i = requests.begin();
440 i != requests.end(); ++i) {
444 const Surface* surface = (const Surface*) i->request_data;
445 if (i->angle == 0.0f &&
446 i->color.red == 1.0f && i->color.green == 1.0f &&
447 i->color.blue == 1.0f && i->color.alpha == 1.0f )
448 surface->draw(i->pos.x, i->pos.y, i->alpha, i->drawing_effect);
450 surface->draw(i->pos.x, i->pos.y, i->alpha, i->angle, i->color, i->blend, i->drawing_effect);
454 draw_surface_part(*i);
463 draw_filled_rect(*i);
465 case LIGHTMAPREQUEST:
476 DrawingContext::push_transform()
478 transformstack.push_back(transform);
482 DrawingContext::pop_transform()
484 assert(!transformstack.empty());
486 transform = transformstack.back();
487 transformstack.pop_back();
491 DrawingContext::set_drawing_effect(DrawingEffect effect)
493 transform.drawing_effect = effect;
497 DrawingContext::get_drawing_effect() const
499 return transform.drawing_effect;
503 DrawingContext::set_alpha(float alpha)
505 transform.alpha = alpha;
509 DrawingContext::get_alpha() const
511 return transform.alpha;
515 DrawingContext::push_target()
517 target_stack.push_back(target);
521 DrawingContext::pop_target()
523 set_target(target_stack.back());
524 target_stack.pop_back();
528 DrawingContext::set_target(Target target)
530 this->target = target;
531 if(target == LIGHTMAP)
532 requests = &lightmap_requests;
534 requests = &drawing_requests;
538 DrawingContext::set_ambient_color( Color new_color )
540 ambient_color = new_color;