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 #include "obstack/obstackpp.hpp"
37 #define LIGHTMAP_DIV 5
41 SURFACE, SURFACE_PART, TEXT, GRADIENT, FILLRECT, LIGHTMAPREQUEST, GETLIGHT
44 struct SurfacePartRequest
46 const Surface* surface;
54 FontAlignment alignment;
57 struct GradientRequest
63 struct FillRectRequest
75 DrawingEffect drawing_effect;
85 color(1.0f, 1.0f, 1.0f, 1.0f)
88 bool operator<(const DrawingRequest& other) const
90 return layer < other.layer;
94 struct GetLightRequest
99 static inline int next_po2(int val)
108 DrawingContext::DrawingContext()
109 : ambient_color(1.0f, 1.0f, 1.0f, 1.0f), target(NORMAL)
111 screen = SDL_GetVideoSurface();
113 lightmap_width = screen->w / LIGHTMAP_DIV;
114 lightmap_height = screen->h / LIGHTMAP_DIV;
115 unsigned int width = next_po2(lightmap_width);
116 unsigned int height = next_po2(lightmap_height);
118 lightmap = new Texture(width, height, GL_RGB);
120 lightmap_uv_right = static_cast<float>(lightmap_width) / static_cast<float>(width);
121 lightmap_uv_bottom = static_cast<float>(lightmap_height) / static_cast<float>(height);
122 texture_manager->register_texture(lightmap);
124 requests = &drawing_requests;
129 DrawingContext::~DrawingContext()
131 obstack_free(&obst, NULL);
133 texture_manager->remove_texture(lightmap);
138 DrawingContext::draw_surface(const Surface* surface, const Vector& position,
139 float angle, const Color& color, const Blend& blend,
142 assert(surface != 0);
144 DrawingRequest* request = new(obst) DrawingRequest();
146 request->type = SURFACE;
147 request->pos = transform.apply(position);
149 if(request->pos.x >= SCREEN_WIDTH || request->pos.y >= SCREEN_HEIGHT
150 || request->pos.x + surface->get_width() < 0
151 || request->pos.y + surface->get_height() < 0)
154 request->layer = layer;
155 request->drawing_effect = transform.drawing_effect;
156 request->alpha = transform.alpha;
157 request->angle = angle;
158 request->color = color;
159 request->blend = blend;
161 request->request_data = const_cast<Surface*> (surface);
163 requests->push_back(request);
167 DrawingContext::draw_surface(const Surface* surface, const Vector& position,
170 draw_surface(surface, position, 0.0f, Color(1.0f, 1.0f, 1.0f), Blend(), layer);
174 DrawingContext::draw_surface_part(const Surface* surface, const Vector& source,
175 const Vector& size, const Vector& dest, int layer)
177 assert(surface != 0);
179 DrawingRequest* request = new(obst) DrawingRequest();
181 request->type = SURFACE_PART;
182 request->pos = transform.apply(dest);
183 request->layer = layer;
184 request->drawing_effect = transform.drawing_effect;
185 request->alpha = transform.alpha;
187 SurfacePartRequest* surfacepartrequest = new(obst) SurfacePartRequest();
188 surfacepartrequest->size = size;
189 surfacepartrequest->source = source;
190 surfacepartrequest->surface = surface;
192 // clip on screen borders
193 if(request->pos.x < 0) {
194 surfacepartrequest->size.x += request->pos.x;
195 if(surfacepartrequest->size.x <= 0)
197 surfacepartrequest->source.x -= request->pos.x;
200 if(request->pos.y < 0) {
201 surfacepartrequest->size.y += request->pos.y;
202 if(surfacepartrequest->size.y <= 0)
204 surfacepartrequest->source.y -= request->pos.y;
207 request->request_data = surfacepartrequest;
209 requests->push_back(request);
213 DrawingContext::draw_text(const Font* font, const std::string& text,
214 const Vector& position, FontAlignment alignment, int layer)
216 DrawingRequest* request = new(obst) DrawingRequest();
218 request->type = TEXT;
219 request->pos = transform.apply(position);
220 request->layer = layer;
221 request->drawing_effect = transform.drawing_effect;
222 request->alpha = transform.alpha;
224 TextRequest* textrequest = new(obst) TextRequest();
225 textrequest->font = font;
226 textrequest->text = text;
227 textrequest->alignment = alignment;
228 request->request_data = textrequest;
230 requests->push_back(request);
234 DrawingContext::draw_center_text(const Font* font, const std::string& text,
235 const Vector& position, int layer)
237 draw_text(font, text, Vector(position.x + SCREEN_WIDTH/2, position.y),
238 ALIGN_CENTER, layer);
242 DrawingContext::draw_gradient(const Color& top, const Color& bottom, int layer)
244 DrawingRequest* request = new(obst) DrawingRequest();
246 request->type = GRADIENT;
247 request->pos = Vector(0,0);
248 request->layer = layer;
250 request->drawing_effect = transform.drawing_effect;
251 request->alpha = transform.alpha;
253 GradientRequest* gradientrequest = new(obst) GradientRequest();
254 gradientrequest->top = top;
255 gradientrequest->bottom = bottom;
256 request->request_data = gradientrequest;
258 requests->push_back(request);
262 DrawingContext::draw_filled_rect(const Vector& topleft, const Vector& size,
263 const Color& color, int layer)
265 DrawingRequest* request = new(obst) DrawingRequest();
267 request->type = FILLRECT;
268 request->pos = transform.apply(topleft);
269 request->layer = layer;
271 request->drawing_effect = transform.drawing_effect;
272 request->alpha = transform.alpha;
274 FillRectRequest* fillrectrequest = new(obst) FillRectRequest();
275 fillrectrequest->size = size;
276 fillrectrequest->color = color;
277 fillrectrequest->color.alpha = color.alpha * transform.alpha;
278 request->request_data = fillrectrequest;
280 requests->push_back(request);
284 DrawingContext::draw_filled_rect(const Rect& rect, const Color& color,
287 DrawingRequest* request = new(obst) DrawingRequest();
289 request->type = FILLRECT;
290 request->pos = transform.apply(rect.p1);
291 request->layer = layer;
293 request->drawing_effect = transform.drawing_effect;
294 request->alpha = transform.alpha;
296 FillRectRequest* fillrectrequest = new(obst) FillRectRequest;
297 fillrectrequest->size = Vector(rect.get_width(), rect.get_height());
298 fillrectrequest->color = color;
299 fillrectrequest->color.alpha = color.alpha * transform.alpha;
300 request->request_data = fillrectrequest;
302 requests->push_back(request);
306 DrawingContext::get_light(const Vector& position, Color* color)
308 if( ambient_color.red == 1.0f && ambient_color.green == 1.0f
309 && ambient_color.blue == 1.0f ) {
310 *color = Color( 1.0f, 1.0f, 1.0f);
314 DrawingRequest* request = new(obst) DrawingRequest();
315 request->type = GETLIGHT;
316 request->pos = transform.apply(position);
318 //There is no light offscreen.
319 if(request->pos.x >= SCREEN_WIDTH || request->pos.y >= SCREEN_HEIGHT
320 || request->pos.x < 0 || request->pos.y < 0){
321 *color = Color( 0, 0, 0);
325 request->layer = LAYER_GUI; //make sure all get_light requests are handled last.
326 GetLightRequest* getlightrequest = new(obst) GetLightRequest();
327 getlightrequest->color_ptr = color;
328 request->request_data = getlightrequest;
329 lightmap_requests.push_back(request);
333 DrawingContext::get_light(const DrawingRequest& request) const
335 const GetLightRequest* getlightrequest
336 = (GetLightRequest*) request.request_data;
339 for( int i = 0; i<3; i++)
340 pixels[i] = 0.0f; //set to black
342 float posX = request.pos.x * lightmap_width / SCREEN_WIDTH;
343 float posY = screen->h - request.pos.y * lightmap_height / SCREEN_HEIGHT;
344 glReadPixels((GLint) posX, (GLint) posY , 1, 1, GL_RGB, GL_FLOAT, pixels);
345 *(getlightrequest->color_ptr) = Color( pixels[0], pixels[1], pixels[2]);
346 //printf("get_light %f/%f =>%f/%f r%f g%f b%f\n", request.pos.x, request.pos.y, posX, posY, pixels[0], pixels[1], pixels[2]);
350 DrawingContext::draw_surface_part(const DrawingRequest& request) const
352 const SurfacePartRequest* surfacepartrequest
353 = (SurfacePartRequest*) request.request_data;
355 surfacepartrequest->surface->draw_part(
356 surfacepartrequest->source.x, surfacepartrequest->source.y,
357 request.pos.x, request.pos.y,
358 surfacepartrequest->size.x, surfacepartrequest->size.y,
359 request.alpha, request.drawing_effect);
363 DrawingContext::draw_gradient(const DrawingRequest& request) const
365 const GradientRequest* gradientrequest
366 = (GradientRequest*) request.request_data;
367 const Color& top = gradientrequest->top;
368 const Color& bottom = gradientrequest->bottom;
370 glDisable(GL_TEXTURE_2D);
372 glColor4f(top.red, top.green, top.blue, top.alpha);
374 glVertex2f(SCREEN_WIDTH, 0);
375 glColor4f(bottom.red, bottom.green, bottom.blue, bottom.alpha);
376 glVertex2f(SCREEN_WIDTH, SCREEN_HEIGHT);
377 glVertex2f(0, SCREEN_HEIGHT);
379 glEnable(GL_TEXTURE_2D);
383 DrawingContext::draw_text(const DrawingRequest& request) const
385 const TextRequest* textrequest = (TextRequest*) request.request_data;
387 textrequest->font->draw(textrequest->text, request.pos,
388 textrequest->alignment, request.drawing_effect, request.alpha);
392 DrawingContext::draw_filled_rect(const DrawingRequest& request) const
394 const FillRectRequest* fillrectrequest
395 = (FillRectRequest*) request.request_data;
397 float x = request.pos.x;
398 float y = request.pos.y;
399 float w = fillrectrequest->size.x;
400 float h = fillrectrequest->size.y;
402 glDisable(GL_TEXTURE_2D);
403 glColor4f(fillrectrequest->color.red, fillrectrequest->color.green,
404 fillrectrequest->color.blue, fillrectrequest->color.alpha);
409 glVertex2f(x+w, y+h);
412 glEnable(GL_TEXTURE_2D);
416 DrawingContext::draw_lightmap(const DrawingRequest& request) const
418 const Texture* texture = reinterpret_cast<Texture*> (request.request_data);
420 // multiple the lightmap with the framebuffer
421 glBlendFunc(GL_DST_COLOR, GL_ZERO);
423 glBindTexture(GL_TEXTURE_2D, texture->get_handle());
426 glTexCoord2f(0, lightmap_uv_bottom);
429 glTexCoord2f(lightmap_uv_right, lightmap_uv_bottom);
430 glVertex2f(SCREEN_WIDTH, 0);
432 glTexCoord2f(lightmap_uv_right, 0);
433 glVertex2f(SCREEN_WIDTH, SCREEN_HEIGHT);
436 glVertex2f(0, SCREEN_HEIGHT);
440 glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
444 DrawingContext::do_drawing()
447 assert(transformstack.empty());
448 assert(target_stack.empty());
450 transformstack.clear();
451 target_stack.clear();
453 //Use Lightmap if ambient color is not white.
454 bool use_lightmap = ( ambient_color.red != 1.0f || ambient_color.green != 1.0f ||
455 ambient_color.blue != 1.0f );
457 // PART1: create lightmap
459 glViewport(0, screen->h - lightmap_height, lightmap_width, lightmap_height);
460 glMatrixMode(GL_PROJECTION);
462 glOrtho(0, SCREEN_WIDTH, SCREEN_HEIGHT, 0, -1.0, 1.0);
463 glMatrixMode(GL_MODELVIEW);
466 glClearColor( ambient_color.red, ambient_color.green, ambient_color.blue, 1 );
467 glClear(GL_COLOR_BUFFER_BIT);
468 handle_drawing_requests(lightmap_requests);
469 lightmap_requests.clear();
472 glBindTexture(GL_TEXTURE_2D, lightmap->get_handle());
473 glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 0, screen->h - lightmap_height, lightmap_width, lightmap_height);
475 glViewport(0, 0, screen->w, screen->h);
476 glMatrixMode(GL_PROJECTION);
478 glOrtho(0, SCREEN_WIDTH, SCREEN_HEIGHT, 0, -1.0, 1.0);
479 glMatrixMode(GL_MODELVIEW);
483 // add a lightmap drawing request into the queue
484 DrawingRequest* request = new(obst) DrawingRequest();
485 request->type = LIGHTMAPREQUEST;
486 request->layer = LAYER_HUD - 1;
487 request->request_data = lightmap;
488 requests->push_back(request);
491 //glClear(GL_COLOR_BUFFER_BIT);
492 handle_drawing_requests(drawing_requests);
493 drawing_requests.clear();
494 obstack_free(&obst, NULL);
496 assert_gl("drawing");
498 SDL_GL_SwapBuffers();
501 class RequestPtrCompare
502 : public std::binary_function<const DrawingRequest*,
503 const DrawingRequest*,
507 bool operator()(const DrawingRequest* r1, const DrawingRequest* r2) const
514 DrawingContext::handle_drawing_requests(DrawingRequests& requests) const
516 std::stable_sort(requests.begin(), requests.end(), RequestPtrCompare());
518 DrawingRequests::const_iterator i;
519 for(i = requests.begin(); i != requests.end(); ++i) {
520 const DrawingRequest& request = **i;
522 switch(request.type) {
525 const Surface* surface = (const Surface*) request.request_data;
526 if (request.angle == 0.0f &&
527 request.color.red == 1.0f && request.color.green == 1.0f &&
528 request.color.blue == 1.0f && request.color.alpha == 1.0f) {
529 surface->draw(request.pos.x, request.pos.y, request.alpha,
530 request.drawing_effect);
532 surface->draw(request.pos.x, request.pos.y,
533 request.alpha, request.angle, request.color,
534 request.blend, request.drawing_effect);
539 draw_surface_part(request);
542 draw_gradient(request);
548 draw_filled_rect(request);
550 case LIGHTMAPREQUEST:
551 draw_lightmap(request);
561 DrawingContext::push_transform()
563 transformstack.push_back(transform);
567 DrawingContext::pop_transform()
569 assert(!transformstack.empty());
571 transform = transformstack.back();
572 transformstack.pop_back();
576 DrawingContext::set_drawing_effect(DrawingEffect effect)
578 transform.drawing_effect = effect;
582 DrawingContext::get_drawing_effect() const
584 return transform.drawing_effect;
588 DrawingContext::set_alpha(float alpha)
590 transform.alpha = alpha;
594 DrawingContext::get_alpha() const
596 return transform.alpha;
600 DrawingContext::push_target()
602 target_stack.push_back(target);
606 DrawingContext::pop_target()
608 set_target(target_stack.back());
609 target_stack.pop_back();
613 DrawingContext::set_target(Target target)
615 this->target = target;
616 if(target == LIGHTMAP) {
617 requests = &lightmap_requests;
619 assert(target == NORMAL);
620 requests = &drawing_requests;
625 DrawingContext::set_ambient_color( Color new_color )
627 ambient_color = new_color;