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