src/video/sdl/sdl_lightmap.cpp

   1 //  SuperTux
   2 //  Copyright (C) 2006 Matthias Braun <matze@braunis.de>
   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 <iostream>
  18
  19 #include "video/sdl/sdl_lightmap.hpp"
  20 #include "video/sdl/sdl_surface_data.hpp"
  21 #include "video/sdl/sdl_texture.hpp"
  22 #include "video/sdl/sdl_renderer.hpp"
  23 #include "video/sdl/sdl_painter.hpp"
  24
  25 SDLLightmap::SDLLightmap() :
  26   renderer(static_cast<SDLRenderer*>(Renderer::instance())->get_sdl_renderer()),
  27   width(),
  28   height(),
  29   LIGHTMAP_DIV()
  30 {
  31   LIGHTMAP_DIV = 8;
  32
  33   width = 800; //screen->w / LIGHTMAP_DIV;
  34   height = 600; //screen->h / LIGHTMAP_DIV;
  35
  36   SDL_Renderer* renderer = static_cast<SDLRenderer*>(Renderer::instance())->get_sdl_renderer();
  37   texture = SDL_CreateTexture(renderer,
  38                               SDL_PIXELFORMAT_RGB888,
  39                               SDL_TEXTUREACCESS_TARGET,
  40                               width, height);
  41   if (!texture)
  42   {
  43     std::stringstream msg;
  44     msg << "Couldn't create lightmap texture: " << SDL_GetError();
  45     throw std::runtime_error(msg.str());
  46   }
  47 }
  48
  49 SDLLightmap::~SDLLightmap()
  50 {
  51   SDL_DestroyTexture(texture);
  52 }
  53
  54 void
  55 SDLLightmap::start_draw(const Color &ambient_color)
  56 {
  57   SDL_SetRenderTarget(renderer, texture);
  58
  59   Uint8 r = static_cast<Uint8>(ambient_color.red * 255);
  60   Uint8 g = static_cast<Uint8>(ambient_color.green * 255);
  61   Uint8 b = static_cast<Uint8>(ambient_color.blue * 255);
  62
  63   SDL_SetRenderDrawColor(renderer, r, g, b, 255);
  64   SDL_RenderClear(renderer);
  65 }
  66
  67 void
  68 SDLLightmap::end_draw()
  69 {
  70   SDL_SetRenderTarget(renderer, NULL);
  71 }
  72
  73 void
  74 SDLLightmap::do_draw()
  75 {
  76   SDL_SetTextureBlendMode(texture, SDL_BLENDMODE_MOD);
  77
  78   SDL_Rect dst_rect;
  79   dst_rect.x = 0;
  80   dst_rect.y = 0;
  81   dst_rect.w = width;
  82   dst_rect.h = height;
  83
  84   SDL_RenderCopy(renderer, texture, NULL, &dst_rect);
  85 }
  86
  87 void
  88 SDLLightmap::draw_surface(const DrawingRequest& request)
  89 {
  90   SDLPainter::draw_surface(renderer, request);
  91 }
  92
  93 void
  94 SDLLightmap::draw_surface_part(const DrawingRequest& request)
  95 {
  96   SDLPainter::draw_surface_part(renderer, request);
  97 }
  98
  99 void
 100 SDLLightmap::draw_gradient(const DrawingRequest& request)
 101 {
 102   SDLPainter::draw_gradient(renderer, request);
 103 }
 104
 105 void
 106 SDLLightmap::draw_filled_rect(const DrawingRequest& request)
 107 {
 108   SDLPainter::draw_filled_rect(renderer, request);
 109 }
 110
 111 void
 112 SDLLightmap::get_light(const DrawingRequest& request) const
 113 {
 114   const GetLightRequest* getlightrequest
 115     = (GetLightRequest*) request.request_data;
 116
 117   SDL_Rect rect;
 118   rect.x = static_cast<int>(request.pos.x * width / SCREEN_WIDTH);
 119   rect.y = static_cast<int>(request.pos.y * height / SCREEN_HEIGHT);
 120   rect.w = 1;
 121   rect.h = 1;
 122
 123   SDL_SetRenderTarget(renderer, texture);
 124   Uint8 pixel[4];
 125   int ret = SDL_RenderReadPixels(renderer, &rect,
 126                                  SDL_PIXELFORMAT_RGB888,
 127                                  pixel,
 128                                  1);
 129   if (ret != 0)
 130   {
 131     log_warning << "failed to read pixels: " << SDL_GetError() << std::endl;
 132   }
 133   SDL_SetRenderTarget(renderer, 0);
 134
 135   *(getlightrequest->color_ptr) = Color(pixel[2] / 255.0f,
 136                                         pixel[1] / 255.0f,
 137                                         pixel[0] / 255.0f);
 138 }
 139
 140 /* EOF */